Obsolete Technology Tellye !

True Televisions have the CRT Tube !! Welcome to the Obsolete Technology Tellye Web Museum. Here you will see a TV Museum showing many Old Tube Television sets all with the CRT Tube, B/W ,color, Digital, and 100HZ Scan rate, Tubes technology. This is the opportunity on the WEB to see, one more time, what real technology WAS ! In the mean time watch some crappy lcd picture around shop centers (but don't buy them, or money lost, they're already broken when new) !!!

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and information about some of the electronic, electrical and electrotechnical Obsolete technology relics that the Frank Sharp Private museum has accumulated over the years .

Premise: There are lots of vintage electrical and electronic items that have not survived well or even completely disappeared and forgotten.

Or are not being collected nowadays in proportion to their significance or prevalence in their heyday, this is bad and the main part of the death land. The heavy, ugly sarcophagus; models with few endearing qualities, devices that have some over-riding disadvantage to ownership such as heavy weight,toxicity or inflated value when dismantled, tend to be under-represented by all but the most comprehensive collections and museums. They get relegated to the bottom of the wants list, derided as 'more trouble than they are worth', or just forgotten entirely. As a result, I started to notice gaps in the current representation of the history of electronic and electrical technology to the interested member of the public.

Following this idea around a bit, convinced me that a collection of the peculiar alone could not hope to survive on its own merits, but a museum that gave equal display space to the popular and the unpopular, would bring things to the attention of the average person that he has previously passed by or been shielded from. It's a matter of culture. From this, the Obsolete Technology Tellye Web Museum concept developed and all my other things too. It's an open platform for all electrical Electronic TV technology to have its few, but NOT last, moments of fame in a working, hand-on environment. We'll never own Colossus or Faraday's first transformer, but I can show things that you can't see at the Science Museum, and let you play with things that the Smithsonian can't allow people to touch, because my remit is different.

There was a society once that was the polar opposite of our disposable, junk society. A whole nation was built on the idea of placing quality before quantity in all things. The goal was not “more and newer,” but “better and higher" .This attitude was reflected not only in the manufacturing of material goods, but also in the realms of art and architecture, as well as in the social fabric of everyday life. The goal was for each new cohort of children to stand on a higher level than the preceding cohort: they were to be healthier, stronger, more intelligent, and more vibrant in every way.

The society that prioritized human, social and material quality is a Winner. Truly, it is the high point of all Western civilization. Consequently, its defeat meant the defeat of civilization itself.

Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

OLD, but ORIGINAL, Well made, Funny, Not remotely controlled............. and not Made in CHINA.

How to use the site:
- If you landed here via any Search Engine, you will get what you searched for and you can search more using the search this blog feature provided by Google. You can visit more posts scrolling the left blog archive of all posts of the month/year,
or you can click on the main photo-page to start from the main page. Doing so it starts from the most recent post to the older post simple clicking on the Older Post button on the bottom of each page after reading , post after post.

You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

- If you arrived here at the main page via bookmark you can visit all the site scrolling the left blog archive of all posts of the month/year pointing were you want , or more simple You can even visit all blog posts, from newer to older, clicking at the end of each bottom page on the Older Post button.
So you can see all the blog/site content surfing all pages in it.

- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

Every CRT Television saved let revive knowledge, thoughts, moments of the past life which will never return again.........

Many contemporary "televisions" (more correctly named as displays) would not have this level of staying power, many would ware out or require major services within just five years or less and of course, there is that perennial bug bear of planned obsolescence where components are deliberately designed to fail and, or manufactured with limited edition specificities..... and without considering........picture......sound........quality........

..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....

Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

Have big FUN ! !
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©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All sets and apparates appearing here are property of Engineer Frank Sharp. NOTHING HERE IS FOR SALE !
All posts are presented here for informative, historical and educative purposes as applicable within Fair Use.

Wednesday, July 21, 2010

DEFLECTION COIL AND YOKE IN CRT PICTURE TUBE CASE STUDY.

DEFLECTION COIL AND YOKE IN CRT PICTURE TUBE, CASE STUDY.

A deflection yoke for a color cathode ray tube has a cone part and a neck holder part. The neck holder part is attached on the outer circumferential surface of the neck of the CRT. The cone part can be rotated against the neck holder part and the neck holder part can be disconnected from the cone part. In the neck holder part, elastic bridges are equally arranged on the outer circumferential surface of a tubular plug. A plurality of ratchets are projected on the elastic bridges. Furthermore, teeth are equally arranged on the inner circumferential surface of the opening of the cone part. The teeth receive the tubular plug in order to mesh with the plurality of ratchets.

Said deflection yoke as claimed in claim 1, wherein said plurality of ratchets are projected on elastic bridges.

3. A deflection yoke comprising:

a neck holder having at one side thereof a tubular plug, the tubular plug having a plurality of ratchets disposed around the tubular plug, and on another side thereof having means for attachment to a neck of a cathode ray tube; and

a cone part having deflection coils and means for separating the coils, and means for defining an opening in an end of said cone part and having teeth on an inner circumference thereof for meshing with the ratchets of the neck holder.

4. The deflection yoke of claim 3, wherein a pitch (x) of the teeth is calculated based on one-half of a length of effective picture area (A) for the cathode ray tube, an up and down movement range (R) of beam rotation, and one-half of a diameter (D) of the neck portion.

5. The deflection yoke of claim 3, wherein x=RD/A.

he present invention relates to a deflection yoke which is mounted on the outer circumferential surface of the funnel of a color cathode ray tube, and more particularly to a deflection yoke which is enabled to freely adjust a vertical and horizontal deflection coil circumferentially around the neck of a color cathode ray tube after assembling a deflection yoke.

BACKGROUND OF THE INVENTION
A deflection yoke is installed on the rear of the outer circumferential surface of the funnel of a color cathode ray tube. Electric field occurring to a vertical and horizontal deflection coil composing the deflection yoke moves and scans electron beams on a fluorescent screen of the colour cathode ray tube to form the picture. Accordingly, it is found to be important that picture quality depends on the precise position of the deflection yoke on the outer circumferential surface of the funnel of the color cathode ray tube. This precise position is determined by the yoke pull-back and the beam rotation. The yoke pull-back is to move the deflection yoke axially on the outer circumferential surface of the neck of a color cathode ray tube, resulting in controlling the static convergence and the purity. The beam rotation is to adjust the inclination of the deflection yoke mounted on the funnel and move it circumferentially around the outer circumferential surface of the neck, resulting in controlling the dynamic convergence.(PHOTO on the left shows a machine for deflection yoke winding featuring.)

In the conventional deflection yoke having the above-mentioned structure, when a deflecting current having a saw tooth wave is supplied for the scanning of the horizontal and vertical deflection coils 2, 5, a deflection magnetic field is produced. There are simultaneously produced an alternating current transmission loss (a copper loss, an eddy current loss and a surface loss) in the coils 2, 5 and an iron loss (a hysteresis loss and an eddy current loss) in the core 4. These losses become large as the frequency of the deflection current flowing in the coils 2, 5 is high and the intensity of the deflection current is high. Recently, a method of increasing the frequency of a deflecting current to the horizontal deflection coil 2 has been employed to increase the resolution power of a picture image. Further, a wide-angle deflection characteristic has been required to obtain a large display area. This requires a large amount of a deflecting current. Accordingly, the temperature of each element in the deflection yoke 1 is further increased, whereby problems such as a change of convergence due to deterioration in the characteristics of the core 4, the deformation of the separator 3 and the deformation of the deflection yoke, and/or reduction in the durability of the deflection yoke 1 due to the thermal deterioration of the insulating material are caused.
In the conventional deflection yoke, although attempts have been made to increase the cross-sectional area of the deflection coil and the volume of the core or to provide a cooling fan in order to suppress a temperature rise at each of the elements of the deflection yoke 1 which is caused by supplying a large amount of a deflecting current having a high frequency to the horizontal deflection coil 2 for the purpose of obtaining a high resolution power and a wide-angle deflection characteristic, there still remains a problem that a sufficient cooling effect can not be obtained in a case, in particular, of a type that the scanning is conducted at a high frequency of 130 kHz or having a wide-angle deflection of 110°.

Abstract

A deflection coil system for a picture tube has a primary deflection coil and an auxiliary deflection coil. The primary and auxiliary deflection coils are each operable to produce a respective magnetic field having a first polarity within a region defined by the coil and an opposite polarity in a second region. Each of the two coils is arranged such that part of the positive polarity field of each coil and all of its opposite polarity field, are in each case coupled to the other coil. This cancels the effects of cross coupling of the primary and auxiliary deflection coils, which are placed in proximity to each other on the same axis, for example on the neck and envelope of a television display tube. At least one of the primary and auxiliary deflection coils may be a saddle shaped deflection coil and has a flat end turn section, substantially defining the opposite polarity area.

The primary and auxiliary deflection coils are overlapped on the tube over at least part of this end turn section.

When a deflection yoke is provided by winding horizontal deflection coils so that right and left ends of its bend portion on a screen face side protrude farther toward the screen face side than the center of the bend portion does, works for attaching vertical deflection coils and a core to an insulating frame can be carried out stably. The insulating frame is resin-molded so that an opening on the screen face side is shaped along the bend portion on the screen face side of a pair of upper and lower horizontal deflection coils. Protrusions (convexes) are provided at four positions between right/left portion “A” in a X-axis (horizontal axis) direction and top/bottom portion “B” in a Y-axis (vertical axis) direction of a periphery of the opening on the screen face side of the insulating frame.

outside of the insulating frame and generate a vertical deflection field for deflecting the
electron beam in a vertical direction; and a core disposed outside of the vertical deflection
coils, wherein the horizontal deflection coils are wound so that right and left ends of its bend
portion on the screen face side protrude farther toward the screen face side than the center
of the bend portion does; the insulating frame is formed so that an opening on the screen face
side is shaped along the bend portion on the screen face side of the pair of upper and lower
horizontal deflection coils; and convexes protruding toward the screen face side are provided
at positions between right/left portion and top/bottom portion of a periphery of the opening
on the screen face side of the insulating frame. 2. The deflection yoke according to claim 1,
wherein the convexes have a height being set so that tip ends of the convexes are in contact
with a plane containing the right and left portions of the periphery of the opening on the screen
face side of the insulating frame and being perpendicular to a Z-axis (tube axis). 3.
The deflection
yoke according to claim 1, wherein the convexes are provided to the insulating frame
removably.
4. A picture tube apparatus comprising: a valve made up of a face panel having a screen
face on
its external surface, a funnel connected to a rear portion of the face panel; an electron gun
that
is housed in a neck portion of the funnel; and a deflection yoke that is mounted at an outer
circumference of the funnel on the neck portion side, and deflects an electron beam emitted
from the electron gun in horizontal and vertical directions, wherein the deflection yoke is any
of the deflection yokes according to claim 1.

DESCRIPTION:

FIELD OF THE INVENTION

The present invention relates to a deflection yoke that is used for a picture tube apparatus such as a television set and a projection tube apparatus in order to deflect an electron beam emitted from an electron gun in horizontal and vertical directions. The present invention relates also to a picture tube apparatus using the deflection yoke.

BACKGROUND OF THE INVENTION

Generally, for higher resolution of projection-type projection televisions, a deflection field of a deflection yoke included in its projection tube apparatus is a substantially uniform field. Thus, pincushion distortions 1 ( 1 a , 1 b ) of an image that occur due to geometric reasons as shown in FIG. 8 remain, and a correction circuit of a projection television set corrects these pincushion distortions 1 . Particularly, it is known that the proportion of the power necessary to correct the pincushion distortion 1 a in upper and lower portions of the screen accounts for at least 10% of the entire power consumption of a projection television set. With an increasing demand for energy saving in recent years, projection television set manufacturers are facing design difficulties.

Conventionally, in order to solve the above-described problems, techniques discussed below
have been proposed (see e.g., JP 2003-123669A).

FIG. 9 shows a side view of a conventional deflection yoke.
As shown in FIG. 9, the conventional deflection yoke 2 is
made up of horizontal deflection coils 3 , vertical deflection
coils 4 , and a core 5 . In the vicinity 6 of an opening on the
screen face side of the deflection yoke 2 , horizontal
correction coils 7 and vertical correction coils 8 are
disposed at the left and right and the top and bottom
of the opening, respectively. Here, the horizontal correction
coils 7 are connected to the horizontal deflection coils 3
in series, and the vertical correction coils 8 are connected
to the vertical deflection coils 4 in series.
The operation of the conventional deflection yoke 2 configured as above, particularly the
operation of the vertical correction coils 8 is described below with reference to FIGS. 9 and 10.
FIG. 10 is a diagram for schematically describing the operation of the conventional deflection
yoke. As shown in FIGS. 9 and 10, when a vertical deflection current passes through the
vertical deflection coils 4 , a current passes through the vertical correction coils 8 disposed
at the top and bottom in the vicinity 6 of the opening on the screen face side of the deflection
yoke 2 , thereby generating a correction field 9 . Thus, an electron beam 10 is subjected to the

Lorentz force 11 in the direction away from the Z-axis (the tube axis) in the vicinity of the
upper and lower portions of the screen, and the pincushion distortion in the upper and lower
portions of the screen is corrected. Similarly, when a horizontal deflection current passes
through the horizontal deflection coils 3 and when a current passes through the horizontal
correction coils 7 , pincushion distortion in the left and right portions of the screen is corrected.
However, in the technique disclosed in JP 2003-123669A, the horizontal correction coils 7
and the vertical correction coils 8 are necessary in addition to the deflection yoke 2 , and the
number of manufacturing steps required for assembling these coils also increases, resulting
in a problem of an increase in the cost of the deflection yoke 2 .

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problem, the present applicant has proposed a
technique of correcting the pincushion distortion in the upper and lower portions of the screen
efficiently without using vertical correction coils or the like, by winding horizontal deflection
coils so that right and left ends of its bend portion on the screen face side protrude farther
toward the screen face side than the center of the bend portion does.

An object of the present invention is to provide a deflection yoke that
has thus wound horizontal deflection coils and that allows stable processes for attaching
the vertical deflection coils and the cores to the insulating frame, and also a picture
tube apparatus using the deflection yoke.

In order to achieve the above-mentioned object, a configuration of a deflection

yoke according to the present invention includes: an insulating frame; a pair of upper
and lower horizontal deflection coils that are disposed inside of the insulating frame
and generate a horizontal deflection field for deflecting an electron beam in a horizontal
direction; a pair of right and left vertical deflection coils that are disposed outside of the
insulating frame and generate a vertical deflection field for deflecting the electron beam
in a vertical direction; and a core disposed outside of the vertical deflection coils.
The horizontal deflection coils are wound so that right and left ends of its bend portion
on the screen face side protrude farther toward the screen face side than the center
of the bend portion does. The insulating frame is formed so that an opening on the
screen face side is shaped along the bend portion on the screen face side of the
pair of upper and lower horizontal deflection coils. Convexes protruding toward the
screen face side are provided at positions between right/left portion and top/bottom
portion of a periphery of the opening on the screen face side of the insulating frame.

It is also preferable in the configuration of the deflection yoke according to the present
invention that the convexes have a height being set so that tip ends of the convexes are
in contact with a plane containing the right and left portions of the periphery of the opening
on the screen face side of the insulating frame and being perpendicular to a Z-axis (tube axis).
It is also preferable in the configuration of the deflection yoke according to the present
invention that the convexes are provided on the insulating frame removably.

A configuration of a picture tube apparatus according to the present invention includes:
a valve made up of a face panel having a screen face on its external surface, a funnel
connected to a rear portion of the face panel; an electron gun that is housed in a neck
portion of the funnel; and a deflection yoke that is mounted at an outer circumference
of the funnel on the neck portion side, and deflects an electron beam emitted from the
electron gun in horizontal and vertical directions.
The deflection yoke is the deflection yoke of the present invention.
According to the present invention, even when an insulating frame is placed on a
workbench, with its opening on the screen face side facing downward, the insulating
frame will not become unstable. Therefore, processes for attaching the vertical deflection
coils and the core to the insulating frame can be carried out stably. Moreover, even when
the deflection yoke is disposed with its opening on the screen face side facing downward
during transport of the deflection yoke, the deflection yoke will not topple and be
damaged due to external vibration or the like. Therefore, the reliability of the deflection
yoke can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view showing an insulating frame for a deflection yoke according to an
embodiment of the present invention.
FIG. 2 is an exploded perspective view showing a deflection yoke according to an embodiment
of the present invention.
FIG. 3 is a side view showing an assembled deflection yoke according to an embodiment
of the present invention.
FIG. 4 is a top view showing a projection tube apparatus equipped with a deflection
yoke according to an embodiment of the present invention.

FIG. 5 is a side view showing a deflection yoke according to an embodiment of the present
invention (from which an insulating frame is omitted).
FIG. 6A is a top view of a projection tube apparatus on which horizontal deflection coils
constituting a deflection yoke are mounted according to an embodiment of the present
invention, and FIG. 6B is a side view thereof (top half only).
FIG. 7 is a side view showing another example of an insulating frame for a deflection
yoke according to an embodiment of the present invention.
FIG. 8 is a diagram for schematically illustrating the pincushion distortions in a
conventional projection tube apparatus.
FIG. 9 is a side view showing a conventional deflection yoke.
FIG. 10 is a diagram for schematically illustrating the operations of the conventional
deflection yoke.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, the present invention will be described more specifically by way of an embodiment.
First, a projection tube apparatus equipped with a deflection yoke according to this
embodiment is described with reference to FIG. 4. FIG. 4 is a top view showing a
projection tube apparatus equipped with a deflection yoke according to an embodiment
of the present invention.

As shown in FIG. 4, a projection tube apparatus 19 includes: a valve (vacuum envelope)
made up of a face panel 21 made of glass or the like and having a substantially rectangular
display portion 20 on its inner surface, a funnel 22 and a cylindrical neck portion 23 also
made of glass or the like and connected to the rear portion of the face panel 21 ; and an
electron gun 26 that emits an electron beam 25 and is housed in the neck portion 23 .
Here, a substantially rectangular screen face 27 is formed on an external surface of the
face panel 21 that is opposite to the display portion 20 . Furthermore, a deflection yoke
12 for deflecting the electron beam 25 emitted from the electron gun 26 in the vertical
and horizontal directions is mounted on an outer circumference of the funnel 22 on the
neck portion 23 side.

The funnel 22 has a portion with a small diameter, or what is known as a yoke portion 24 ,
extending from its junction with the neck portion 23 to an end portion of the deflection yoke
12 on the screen face 27 side. An external conductive material 28 is coated on the external
surface of the funnel 22 from the vicinity of an opening on the screen face 27 side of the
deflection yoke 12 to a connection portion between the face panel 21 and the funnel 22 .
Furthermore, an anode portion 29 is provided between the yoke portion 24 and the
connection portion between the face panel 21 and the funnel 22 , and a predetermined
distance is kept between the end portion of the deflection yoke 12 on the screen face
27 side and the anode portion 29 for insulation. Furthermore, an internal conductive
material (not shown) also is coated on the internal surface of the funnel 22 from the
vicinity of the opening on the screen face 27 side of the deflection yoke 12 to the connection
portion between the face panel 21 and funnel 22 . By obtaining a desired capacitance
between the external conductive material

28 and the internal conductive material, minute variation of a high voltage applied to the
anode portion 29 is absorbed to prevent adverse effects on the image quality.

In the projection tube apparatus 19 having a configuration as described above, an image
is formed on the screen face 27 by accelerating the electron beam 25 emitted from the
electron gun 26 with a high voltage of about 30 kV applied to the anode portion 29 ,
deflecting the electron beam 25 in the horizontal and vertical directions with the
horizontal deflection field and vertical deflection field generated by the deflection
yoke 12 in the yoke portion 24 , and scanning the display portion 20 horizontally and vertically.
FIG. 5 shows a side view of a deflection yoke of this embodiment (from which an insulating
frame is omitted). As shown in FIG. 5, the deflection yoke 12 of this embodiment includes:
a pair of upper and lower horizontal deflection coils 13 that generate a horizontal deflection
field for deflecting the electron beam 25 in the horizontal direction; a pair of right and left
vertical deflection coils 14 that generate a vertical deflection field for deflecting the electron
beam 25 in the vertical direction and are disposed outside of the horizontal deflection coils
13 ; and a ferrite core 15 disposed outside of the vertical deflection coils 14 .
FIG. 6A shows a top view of a projection tube apparatus on which horizontal deflection
coils constituting the deflection yoke are mounted according to this embodiment, and FIG. 6B
shows a side view of the top half thereof.

As shown in FIGS. 6A and 6B, in the projection tube apparatus 19 equipped with a deflection
yoke of this embodiment, a distance Ls between an end portion 16 of the horizontal deflection
coils 13 on the screen face 27 side and the screen face 27 is set to 65 mm. Furthermore, in the
projection tube apparatus 19 equipped with the deflection yoke of this embodiment, the
distance Ls between the end portion 16 of
the horizontal deflection coils 13 on the screen face 27 side and the screen face 27 is set
smaller than a distance Lw between a position 18 on the Z-axis (tube axis) where a height
Hw in the direction of Y-axis (vertical axis) of a bend portion 17 on the screen face 27 side
of the horizontal deflection coils 13 is highest and the screen face 27 , and a difference
ΔLws=Lw−Ls between Ls and Lw is set to 17 mm. Furthermore, when viewed from above
(FIG. 6A), a radius of curvature Rw of the bend portion 17 on the screen face 27 side of the
horizontal deflection coils 13 is set larger than a segment R connecting the position 18 on the
Z-axis (tube axis) where the height Hw in the direction of Y-axis (vertical axis) of the bend
portion 17 is highest and the anode portion 29 . It should be noted that the foregoing
dimensional settings are for the 16 cm (7 inches) projection tube apparatus.
By providing dimensional settings as described above, the pincushion distortions in upper
and lower portions of the screen can be corrected efficiently, and the effects of the minute
variation of a high voltage applied to the anode portion 29 on the image quality also can be
suppressed. Furthermore, a desired insulation distance can be ensured between the
horizontal deflection coils 13 and the anode portion 29 .

As mentioned above, the horizontal deflection coils 13 of the deflection yoke 12
according to this embodiment are wound so that the right and left ends of the bend
portion 17 on the screen face 27 side protrude farther toward the screen face 27 side
by 17 mm than the center of the bend portion 17 does.
Next, the configuration of the deflection yoke including an insulating frame suitable for
supporting the horizontal deflection coils 13 in such a wound state will be described

below by referring to FIGS. 1-3. FIG. 1 is a side view showing an insulating frame
for a deflection yoke in an embodiment of the present invention. FIG. 2 is an exploded
perspective view showing a deflection yoke in an embodiment of the present invention,
and FIG. 3 is a side view showing an assembled deflection yoke in an embodiment of the
present invention.

As shown in FIGS. 1 and 2, the insulating frame 30 of the deflection yoke 12 according to
this embodiment is resin-molded so that its opening 31 on the screen face 27 side will
be shaped along the bend portion 17 on the screen face 27 side (the left side in FIGS. 1 and 2)
of the pair of upper and lower horizontal deflection coils 13 . That is, the opening 31 on the
screen face 27 side of the insulating frame 30 has right and left portions “A” in the X-axis
(horizontal axis) direction protruding toward the screen face 27 side more than the top and
bottom portions “B” in the Y-axis (vertical axis) direction do.

It is noted that the processes for attaching the vertical deflection coils and the ferrite core
to the insulating frame are carried out in general by placing the insulating frame on a
workbench, with its opening on the screen face side facing downward. However in this
embodiment, as mentioned above, the opening 31 on the screen face 27 side of the
insulating frame 30 has the right and left portions “A” in the X-axis (horizontal axis)
directions protruding toward the screen face 27 side more than the top and bottom
portions “B” in the Y axis (vertical axis) directions do. In this state, the insulating frame
30 will be unstable when it is placed on a workbench, and thus attaching the vertical
deflection coils 14 and the ferrite core 15 to the insulating frame 30
cannot be carried out stably.

In light of this, in this embodiment as shown in FIGS. 1 and 2, pin-like protrusions
(convexes) 32 protruding toward the screen face 27 side are provided at four positions
between the right/left portion “A” in the X-axis (horizontal axis) direction and the top/
bottom portion “B” in the Y-axis (vertical axis) direction of the periphery of the opening

31 on the screen face 27 side of the insulating frame 30 . Here, the respective protrusions
32 have a length (height) being set so that the tip ends will be in contact with a plane
including the right and left portions “A” in the X-axis (horizontal axis) direction of the
opening 31 on the screen face 27 side of the insulating frame 30 and being perpendicular
to the Z-axis (tube axis). Therefore, even when the insulating frame 30 is placed on a
workbench with its opening 31 on the screen face 27 side facing downward, the insulating
frame 30 will not become unstable. As a result, processes for attaching the vertical
deflection coils 14 and the ferrite core 15 to the insulating frame 30 can be carried out stably.
Moreover, the respective protrusions 32 are inserted in holes 34 formed on the insulating
frame 30 for attachment to the insulating frame 30 . That is, the respective protrusions 32
are provided on the insulating frame 30 removably. Thereby, the respective protrusions 32
are attached to the insulating frame 30 only during a process of attaching the vertical
deflection coils 14 and the ferrite core 15 to the insulating frame 30 , or during transportation
of the deflection yoke 12 . When equipping the deflection yoke 12 in the projection tube
apparatus 19 , the respective protrusions 32 can be detached from the insulating frame 30 .

Next, a process of assembling the deflection yoke 12 in this embodiment will be described
below by referring to FIG. 2.
First, the pair of upper and lower horizontal deflection coils 13 are disposed along the inner
wall face of the insulating frame 30 . Though not shown in FIG. 2, the front-end face, the inner
wall face and the rear end face of the insulating frame 30 are processed previously for
supporting the horizontal deflection coils 13 .
Next, protrusions 32 protruding toward the screen face 27 side are attached at four positions
between the right/left portion “A” in the X-axis (horizontal axis) direction and the top/bottom
portion “B” in the Y-axis (vertical axis) direction of the periphery of the opening 31 on the
screen face 27 side of the insulating frame 30 .
Then, the insulating frame 30 with the pair of upper and lower horizontal deflection coils 13
is placed on a workbench, with its opening 31 on the screen face 27 side facing downward.
In this case, in the opening 31 on the screen face 27 side of the insulating frame 30 , the right
and left portions “A” in the X-axis (horizontal axis) direction protrude toward the screen face
27 side more than the top and bottom portions “B” in the Y-axis (vertical axis) direction do.
However, as mentioned above, since the protrusions 32 protruding toward the screen face
27 side are attached at four positions between the right/left portion “A” in the X-axis
(horizontal axis) direction and the top/bottom portion “B” in the Y-axis (vertical direction)
direction of the periphery of the opening 31 on the screen face 27 side of the insulating frame
30 , the insulating frame 30 can be placed stably on the workbench. In this state, a pair of
right and left vertical deflection coils 14 are attached to the outside of the insulating frame 30 ,
a ferrite core 15 is disposed on the outside of the pair of right and left vertical deflection coils
14 , and the vertical deflection coils 14 and the ferrite core 15 are fixed to the insulating
frame 30 with a resin such as a hot-melt or an adhesive. In this case, since the vertical
deflection coils 14 and the ferrite core 15 are attached
to the insulating frame 30 being in a stable state, the processes for attaching the vertical
deflection coils 14 and the ferrite core 15 can be carried out stably.
In this manner, the pair of upper and lower horizontal deflection coils 13 and the pair of right
and left vertical deflection coils 14 are supported on the insulating frame 30 while keeping
electric insulation therebetween, and further a ferrite core 15 is attached, so that the deflection
yoke 12 as shown in FIG. 3 is completed. The protrusions 32 can be detached at a stage
where the deflection yoke 12 is completed. However, the protrusions 32 will be preferably
remain in this stage for transportation of the deflection yoke 12 . That is, by keeping the
protrusions 32 , the deflection yoke 12 is
prevented from toppling to be damaged due to external vibration or the like even when
placing the deflection yoke 12 with the opening 31 on the screen face 27 side of the
insulating frame 30 facing downward. As a result, the reliability of the deflection yoke

12 can be improved.
Though this embodiment refers to an example where convexes are formed to protrude
straight toward the screen face 27 side from the periphery of the opening 31 on the
screen face 27 side of the insulating frame 30 , the convexes can be curved alternatively.
Though the protrusions 32 in this embodiment are provided removably on the insulating
frame 30 , they can be fixed to the insulating frame 30 alternatively.
In this embodiment, the protrusions 32 are provided at four positions between the
right/left portion “A” in the X-axis (horizontal axis) direction and the top/bottom portion
“B” in the Y-axis (vertical axis) direction of the periphery of the opening 31 on the screen
face 27 side of the insulating frame 30 . There will be no substantial problem if this
four-point-support structure is replaced by a three-point-support structure where the
protrusions 32 are provided at only three positions.
In this embodiment, pin-like protrusions 32 are described as an example of the convexes.
However, the convexes are not limited to such a pin shape, but as shown in FIG. 7 for example,
they can be plates 33 formed along the periphery of the opening 31 on the screen face 27
side of the insulating frame 30 . In this case, the plates 33 will have a length (height) being
set so that faces 33 a on the screen face 27 side of the plates 33 will be in contact with a
plane including the right and left portions “A” in the X-axis (horizontal axis) direction of the
opening 31 on the screen face 27 side of the insulating frame 30 and being perpendicular
to the Z-axis (tube axis). Also in this case, the plates 33 as the convexes can be provided
removably to the insulating frame 30 , or they can be fixed to the insulating frame 30 . Also
in this case, a three-point-support structure can be applied as well as the four-point support
structure.
The description in this embodiment refers to an example of a deflection yoke 12 for a
projection tube apparatus. However, the deflection yoke of the present invention will not be
limited to the deflection yoke for a projection tube apparatus, but it can be applied as well
to deflection yokes to be provided in other picture tube apparatuses such as a television set.
The invention may be embodied in other forms without departing from the spirit or essential
characteristics thereof. The embodiments disclosed in this application are to be considered in
all respects as illustrative and not limiting. The scope of the invention is indicated by the
appended claims rather than by the foregoing description, all changes that come within
the meaning and range of equivalency of the claims are intended to be embraced therein.

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