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 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 !

Saturday, September 24, 2011

GRUNDIG SUPER COLOR CINEMA 9000 (GSC900) CHASSIS GCS900 CRT TUBES VIEW AND CONVERGENCE UNIT.















































































Optical objective

(proclar)

An optical objective, usable for reproduction as well as for photographic and cinematographic purposes, consists of five components--two on the object side and three on the image side of a diaphragm space--constituted by a total of seven meniscus-shaped lenses all of whose surfaces are concave toward the diaphragm space, the first object-side component and the middle image-side component being negatively refracting doublets. The objective is bodily movable for focusing purposes and its two object-side components are correlatedly axially shiftable to minimize aberrations over a wide range of magnification ratios.

1. An optical objective consisting of a negatively refracting first component, a positively refracting second component, a positively refracting third components, a negatively refracting fourth component and a positively refracting fifth component, said second and third components being separated by a diaphragm space, said first and second components being coupled for correlated codirectional axial shifts at a relatively slow and a relatively fast rate, respectively, to minimize optical aberrations with different magnification ratios.

2. An optical objective consisting of a negatively refracting first component, a positively refracting second component, a positively refracting third component, a negatively refracting fourth component and a positively refracting fifth component, said components being constituted by meniscus-shaped lenses which are bounded by spherically curved surfaces all concave toward an intervening space separating said second and third components,

said first, second, third, fourth and fifth components having respective individual focal lengths whose absolute magnitudes are related to one another in the ratio of substantially 7.5:1.1:2.7:9.7:1.6.



3. An objective as defined in claim 1 or 2 wherein said first component is a doublet consisting of a positive lens L1 and a negative lens L2, said second and third components being single lenses L3 and L4, said fourth component being a doublet consisting of a negative lens L5 and a positive lens L6, said first component being a single lens L7.

4. An objective as defined in claim 3 wherein said lenses L1 to L7 have radii r1 to r12 and thicknesses and separations d1 to d11 whose numerical values, based upon a value of unity for the overall focal length of the objective, together with their refractive indices ne and their Abbe numbers νe are substantially as given in the following table:
______________________________________
thicknesses lenses radii and separations ne ν e
______________________________________


r1 = +0.31

L1 d1 = 0.11

1.63 57

r2 = +7.78

L2 d2 = 0.08

1.58 41

r3 = +0.21

d3 = 0.03

r4 = +0.31

L3 d4 = 0.03

1.69 48

r5 = +0.50

d5 = 0.12

r6 = -0.91

L4 d6 = 0.02

1.69 48

r7 = -0.62

d7 = 0.03

r8 = -0.18

L5 d8 = 0.03

1.63 35

r9 = -1.24

L6 d9 = 0.06

1.67 48

r10 = -0.23

d10 = 0.03

r11 = -1.10

L7 d11 = 0.03

1.62 60

r12 = -0.54

______________________________________

.



5. An objective as defined in claim 2, usable for photographic reproductions, wherein said first and second components are coupled for correlated codirectional axial shifts at a relatively slow and a relatively fast rate, respectively, to minimize optical aberrations with different magnification ratios.

6. An objective as defined in claim 4 wherein said first and second components are correlatedly shiftable to vary their air spaces d3 and d5 in opposite senses by up to about 0.015 times said overall focal length.

Description:

FIELD OF THE INVENTION

My present invention relates to an optical objective adapted to be used for reproduction of documents or the like as well as for photographic and cinematographic purposes.

BACKGROUND OF THE INVENTION

A known reproduction objective consists of two front components and three rear components separated by an intervening diaphragm space, i.e. a negatively refracting first component and a positively refracting second component on the object side and a positively refracting third component, a negatively refracting fourth component and a positively refracting fifth component on the image side of that space. The two negatively refracting components may be doublets, each composed of two lenses of opposite refractivity, while the others are singlets.

In such an objective it is important to provide satisfactory correction of optical abberrations over the entire field of view, at least for a particular magnification ratio with which it is to be used. When this ratio is subject to variation, the requirements become more stringent.

OBJECT OF THE INVENTION

The object of my present invention, therefore, is to provide an optical objective of this type which can be used over a wide range of magnification ratios with a relatively large aperture, preferably as high as 1:3.5.

SUMMUARY OF THE INVENTION

In accordance with one aspect of my present invention, the constituent lenses of a five-component objective as described above are so dimensioned that their individual focal lengths have absolute magnitudes which, progressing from the first to the fifth component, are related to one another in the ratio of substantially 7.5:1.1:2.7:9.7:1.6, each lens being bounded by spherically curved surfaces which are concave toward the diaphragm space. These individual focal lengths may also be expressed, in terms of the overall focal length F of the objective, by f I ≉-7.5F, f II ≉+1.1F, f III ≉+2.7F, f IV ≉-9.7F, f V ≉+1.6F.

I have found that such an objective, which is bodily movable for focusing purposes between the object plane and the image plane of a reproduction camera, is well corrected for a certain magnification ratio, e.g. of about 1:5, as determined by the positions of these planes in relation to the focal points of the objective. With other magnification ratios above and below this value, however, distortions are encountered which can be corrected, pursuant to a further feature of my invention, by axially shifting the first and second components at different rates but in a correlated manner. More particularly, these components are to be displaced codirectionally, with the first component moving more slowly than the second. Such correlated shifting, pursuant to my invention, could also be used in a differently dimensioned objective of this general type.


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