SCHAUB LORENZ (ITT) 8228 I CHASSIS MONOPRINT B-FS/FST CRT TUBE VALVO EURO COLOR (PHILIPS) A41EAM00X01.

In-line electron gun structure for color cathode ray tube PHILIPS MININECK

In-line electron gun structure for color cathode ray tubes in which the final focusing and accelerating electrodes each employ three in-line tapered, partially overlapping apertures in facing relationship, and at least one aperture opening, preferably the central aperture of the focusing electrode, is elongated to provide electron beam spot-shaping.



1. In an in-line electron gun structure for a color cathode ray tube, a lensing arrangement in the final focusing and accelerating electrodes comprising:
a first lensing structure in the forward portion of the focusing electrode, such structure having three in-line tapered apertures of substantially truncated volumetric configuration having substantially parallel axes of symmetry, each aperture having front beam exits and smaller dimensioned rear beam entrances, the front exits and rear entrances being generally circular and separated by sloping sidewalls, a portion of the sidewall of each aperture intersecting with a portion of the sidewall of an adjacent aperture to form an inwardly sloping arcuate rounded saddle along the region of intersection, such structure resulting from the partial overlapping of geometric constructions of the volumetric configurations; and
a second lensing structure in the rear portion of the final accelerating electrode in adjacent, facing relationship with the first structure, such second structure having three in-line tapered apertures of substantially truncated volumetric configuration having substantially parallel axes of symmetry, each aperture having rear beam entrances and smaller dimensioned front beam exits, the front exits and rear entrances being generally circular and separated by sloping sidwalls, a portion of the sidewall of each aperture intersecting with a portion of the sidewall of an adjacent aperture to form an inwardly sloping arcuate rounded saddle along the region of intersection, such structure resulting from the partial overlapping of geometric constructions of the volumetric configurations,
at least one of said entrances and exits in said first and second lensing structures being elongated to provide electron beam spot-shaping, elongation in the first structure being normal to the in-line plane and elongation in the second structure being in the direction of the in-line plane.
2

. The electron gun structure of claim 1 wherein the rear opening of the central aperture of the first lensing structure is elongated in a direction normal to the in-line plane. 3. The electron gun structure of claim 2 wherein the opening is elongated by an amount of from about 10 to 35 percent of the diameter of the opening in the in-line plane. 4. The electron gun structure of claim 1 wherein the front opening of the central aperture of the second lensing structure is elongated in the direction of the in-line plane. 5. The electron gun structure of claim 4 wherein the opening is elongated by an amount of from about 15 to 40 percent of the diameter of the opening normal to the in-line plane. 6. The electron gun structure of claim 1 wherein the front opening of the central aperture of the first lensing structure is elongated in a direction normal to the in-line plane. 7. The electron gun structure of claim 6 wherein the opening is elongated by an amount of from about 3 to 15 percent of the diameter of the opening in the in-line plane. 8. The electron gun structure of claim 1 wherein the rear opening of the central aperture of the second lensing structure is elongated in the direction of the in-line plane. 9. The electron gun structure of claim 8 wherein the opening is elongated by an amount of from about 5 to 20 percent of the diameter of the opening normal to the in-line plane.

Description:

CROSS REFERENCE TO RELATED APPLICATIONS
U.S. patent application Ser. No. 463,791, filed Feb. 4, 1983, describes and claims color cathode ray tube electrodes having tapered apertures. Such application is a continuation-in-part of Ser. No. 450,574, filed Dec. 16, 1982, now abandoned.
U.S. patent application Ser. No. 484,780, filed Apr. 14, 1983, describes and claims color cathode ray tube electrodes having tapered apertures and beam spot shaping inserts.
The above applications are assigned to the assignee of the present invention.
BACKGROUND OF THE INVENTION
This invention relates to an in-line electron gun structure for color cathode ray tubes (CCRT), in which the apertures of the final focusing and accelerating electrodes are tapered, and more particularly relates to such structures in which one or more apertures are elongated for electron beam spot-shaping.
Reducing the diameter of the necks of CCRTs can lead to cost savings for the television set maker and user in enabling smaller beam deflection yokes and consequent smaller power requirements. However, reducing neck diameter while maintaining or even increasing beam deflection angle and display screen area severely taxes the performance limits of the electron gun.
In the conventional, in-line electron gun design, an electron optical system is formed by applying critically determined voltages to each of a series of spatially positioned apertured electrodes. Each electrode has at least one planar apertured surface oriented normal to the tube's long or Z axis, and containing three side-by-side or "in-line" circular straight-through apertures. The apertures of adjacent electrodes are aligned to allow passage of the three (red, blue, and green) electron beams through the gun.
As the gun is made smaller to fit in the so-called "mini-neck" tube, the apertures are also made smaller and the focusing or lensing aberrations of the apertures are increased, thus degrading the quality of the resultant picture on the display screen.
Various design approaches have been taken to attempt to increase the effective apertures of the gun electrodes. For example, U.S. Pat. No. 4,275,332, and U.S. patent application Ser. No. 303,751, filed Sept. 21, 1981 and assigned to the present assignee, describe overlapping lens structures. U.S. patent application Ser. No. 463,791, filed Feb. 4, 1983 and assigned to the present assignee, describes a "conical field focus" or CFF lens arrangement. Each of these designs is intended to increase effective apertures in the main lensing electrodes and thus to maintain or even improve gun performance in the new "mini-neck" tubes.
In the CFF arrangement, the electrode apertures have the shapes of truncated cones or hemispheres, and thus each aperture has a small opening and a related larger opening. In a preferred embodiment, the apertures are positioned so that the larger openings overlap. This overlapping eliminates portions of the sidewalls between adjacent apertures, leaving an arcuate "saddle" between these apertures.
Regardless of their complex shapes, CFF electrodes may be produced by deep drawing techniques, offering a marked cost advantage over other complex designs. However, in forming the CFF electrodes by drawing for mass production quantities, it has been discovered that the edge of the saddle between adjacent apertures becomes rounded, resulting in a slight decrease in the wall area between the apertures. Unfortunately, such a slight modification to the electrode is sufficient to distort the lensing field, and result in an out-of-round spot for the central electron beam on the display screen.
It is an object of the present invention to provide a modified electron gun structure with overlapping tapered apertures, which modified structure will compensate for the distortion in the lensing field caused by rounded saddles.
SUMMARY OF THE INVENTION
In accordance with the invention, a lensing arrangement, featuring partially overlapping tapered apertures with generally circular openings in the final focusing and accelerating electrodes of an in-line electron gun for a CCRT, is modified by elongating at least one of the openings to provide electron beam spot-shaping, and to compensate for the distortion in the lensing field caused by rounded saddles between adjacent apertures.
Such arrangement involves the final low voltage (focusing) and high voltage (accelerating) lensing electrodes. The forward portion of the focusing electrode and the rear portion of the accelerating electrode are in adjacent, facing relationship, and each defines three partially overlapping, tapered, in-line apertures, a central aperture and two side apertures. The apertures are of a three-dimensional surface of revolution (hereinafter called a volumetric configuration), which is substantially truncated, for example, a truncated cone or hemisphere, the axes of symmetry of which are parallel to one another and to the associated path of the electron beam. Each aperture has a large opening in an outer aperture plane of the electrode and a smaller opening in the interior of the electrode, the openings being generally circular and being separated by sloping sidewalls. A portion of the sidewall of each aperture intersects a portion of the sidewall of an adjacent aperture to form an inwardly-sloping arcuate rounded saddle along the region of the intersection. The resulting structure is derived from the partial overlapping of geometric constructions of the volumetric configurations.
In order to compensate for the lensing field distortion caused by the rounded saddles, the structure includes at least one elongated, electron beam spot-shaping opening, preferably the smaller-dimensioned opening of the central aperture of at least one of the lensing electrodes.
As used herein, the term "elongated" generally means the form resulting from expansion of a circle along a radium (oblong), but also includes forms resulting from such expansion accompanied by some distortion of the circular curvature (eg., ellipse).
In the presently most preferred embodiment, the smaller dimensioned beam-entering rear opening of the central aperture of the focusing electrode is elongated in a direction normal to the in-line plane of the electron gun.
Alternatively, the smaller-dimensioned beam-exiting front opening of the central aperture of the accelerating electrode is elongated in the direction of the in-line plane of the electron gun.
As a further alternative, the larger-dimensioned central aperture opening of either the focusing or accelerating electrode may be elongated to achieve beam spot-shaping.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a sectioned elevation view of a color cathode ray tube wherein the invention is employed;
FIG. 2 is a sectioned view of the forward portion of the in-line plural beam electron gun assembly shown in FIG. 1, such view being taken along the in-line plane thereof;
FIG. 3 is a perspective view from above of the unitized low potential lensing electrode of the gun assembly of FIG. 2, affording a partial view of the small openings of the apertures;
FIG. 4 is a top view of one embodiment of the apertures of the unitized low potential lensing electrode of the invention including an elongated rear opening of the central aperture;
FIG. 5 is a sectioned elevation view of the embodiment of the low potential electrode of FIG. 4 taken along the plane A--A in FIG. 4;
FIG. 6 is a top view of another embodiment of the apertures of the low potential electrode of the invention, including an elongated front opening of the central aperture;
FIG. 7 is a sectioned elevation view of the embodiment of FIG. 6 taken along the plane B--B of FIG. 6;
FIG. 8 is a representation of beam spot shapes related to the electron gun of FIG. 2 without spot-shaping openings;
FIG. 9 is a representation of beam spot shapes related to the electron gun of FIG. 2 with spot-shaping openings; and
FIG. 10 is a top view of an elongated front opening of the central aperture of a unitized high potential lensing electrode of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
With reference to FIG. 1 of the drawings, there is shown a color cathode ray tube (CCRT) 11 of the type employing a plural beam in-line electron gun assembly. The envelope enclosure is comprised of an integration of neck 13, funnel 15 and face panel 17 portions. Disposed on the interior surface of the face panel is a patterned cathodoluminescent screen 19 formed as a repetitive array of color-emitting phosphor components in keeping with the state of the art. A multi-opening structure 21, such as a shadow mask, is positioned within the face panel, spaced from the patterned screen.
Encompassed within the envelope neck portion 13 is a unitized plural beam in-line electron gun assembly 23, comprised of a unitized structure of three side-by-side guns. Emanating therefrom are three separate electron beams 25, 27, and 29 which are directed to pass through mask 21 and land upon screen 19. It is within this electron gun assembly 23 that the structure of the invention resides.
Referring now to FIG. 2, the forward portion of the electron gun 23 of FIG. 1 is shown, including a low potential electrode 31, a high potential electrode 33, and a convergence cup 35. Electrode 31 is the final focusing electrode of the gun structure, and electrode 33 is the final accelerating electrode.
In a "Uni-Bi" gun typically used in mini-neck CCRTs, the main focusing electrode potential is typically 25 to 35 percent of the final accelerating electrode potential, the inter-electrode spacing is typically about 0.040 inches (1.02 millimeters), the angle of taper of the apertures is about 30° with respect to the tube axis, and the aperture diameters (smaller and larger dimensioned openings) are 0.140 and 0.220 inches (3.56 and 5.59 millimeters) for the focusing electrode and 0.150 and 0.250 inches (3.81 and 6.35 millimeters) for the accelerating electrode. The spacing between aperture centers is 0.177 inch (4.50 millimeter) (S ¹ ) for the focusing electrode and 0.182 inch (4.62 millimeter) (S ² ) for the accelerating electrode.
Together, these two electrodes form the final lensing fields for the electron beams. This is accomplished by cooperation between their adjacent, facing apertured portions to form lensing regions which extend across the inter-electrode space. The tapered sidewalls of the apertures enable optimum utilization of the available space inside the tube neck 13.
Referring now to FIG. 3, there is shown a focusing electrode 100 of the type shown in FIG. 2, having three in-line apertures with large front beam-exiting openings 110, 120 and 130 substantially in the forward planar surface of the electrode, and smaller rear beam-entering openings 140, 150 and 160 in the interior of the electrode, such openings connected by substantially tapered sidewalls terminating with relatively short cylindrical portions 170, 180 and 190. Geometric constructions of the apertures are truncated cones (ignoring cylindrical portions 170, 180 and 190) which partially overlap one another. This overlap is indicated in phantom in the forward planar surface, and results in the partial removal of sidewall portions of adjacent aperture and the formation of inwardly sloping arcuate edges 230 and 240. In fabrication of such electrode structure by drawing, the edge tends to have a rounded contour forming what is termed herein a "saddle", resulting in reduced sidewall area between apertures and distortion of the lensing field. This field distortion results (for a typical Uni-Bi mini-neck gun as described above) in electron beam spots at the screen as shown in FIG. 8. That is, the central beam spot tends to become compressed vertically and elongated in the direction of the in-line plane of the three beams. Compensation for such distortion is provided herein by beam spot-shaping elongation of the apertures, one embodiment of which is shown in FIG. 4, which is a top view of the aperture portion of focusing electrode 100. Side aperture openings 140 and 160 are circular, having a diameter "d", while central aperture opening 150 is elongated along each radius normal to in-line plane L by an amount r _e , for a total elongation of two times r _e , or d _e . Thus, the elongated dimension D _e of central opening 150 is d plus d _e . The amount of elongation will vary depending upon the degree of field distortion present and the amount of compensation desired, the amount of compensation increasing with the amount of elongation.
For the Uni-Bi gun described above, the amount of elongation may vary from about 10 to 35 percent (d _e /d×100) in the focusing electrode, and from about 15 to 40 percent in the accelerating electrode. A greater degree of elongation in the accelerating electrode is generally required to achieve the desired compensation because the electrons are traveling faster through this electrode than through the focusing electrode, and are less influenced by field distortions.

Referring now to FIG. 5, which is a section view along plane A--A of FIG. 4, it is seen that front aperture 120 and rear aperture 150 are connected by tapered sidewall 500, which forms an angle θ ₁ with line p, parallel to the tube axis. The elongation of opening 150 results in a slight increase in the height of the elongated cylindrical portion of the aperture, indicated at 501 and 502. The diameters of the front apertures 110, 120 and 130 all have the diameter d _e .
Another embodiment of the beam spot-shaping structure for the central aperture of the focusing electrode is shown in FIG. 6. In this embodiment, the large opening 220 of the central aperture is elongated, rather than the small opening 250. Elongation is again by an amount of two times r _e or d _e , resulting in an elongated dimension D _e . For a given amount of compensation, the amount of elongation required in the large opening is generally less than in the small opening. This is true for both the focusing and accelerating electrodes. The reason for this is that the large openings are closer to the concentration gradient of the lensing fields, and thus less control is required to achieve the desired compensation. Nevertheless, elongation of the smaller openings is generally preferred because of the greater space available in the interior of the electrode than in the forward or apertured plane of the electrode.
For the Uni-Bi gun described above, the amount of elongation may vary from about 3 to 15 percent for the focusing electrode, and from about 5 to 20 percent for the accelerating electrode. In the embodiment of FIG. 6, the rear apertures 240, 250 and 260 all have the diameter d _s .
In FIG. 7, a section view along plane B--B of FIG. 6, front aperture 220 and rear aperture 250 are connected by tapered sidewall 600, which forms angle θ ₂ with line p, parallel to the tube axis L.
FIG. 9 shows the beam spots after compensation by use of the elongated aperture openings as described herein.

FIG. 10 shows the smaller opening 350 of the central aperture of the accelerating electrode, which opening 350 is elongated by an amount d _e to obtain dimension D _e . The principles of electron optics dictate that the direction of elongation in the accelerating electrode must be the same as the direction of elongation of the distorted beam spot, whereas the direction of elongation in the focusing electrode must be normal thereto, to achieve beam spot correction.
While there have been shown and described what are at present considered to be the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined by the appended claims. Just as one example, the side aperture openings can also be elongated in the same manner described for the central openings, to influence the shaping of the side aperture-related beam spots. This may be necessary, for example, in gun structures other than the particular Uni-Bi structure described herein.

Valvo Bauelemente GmbH is a Germany based company, specializing in the delevopment, manufacture and marketing of ferrite components for microwave and rf applications. Initially part of the Philips Components group this business has 30 years experience in the design and production of standard and special ferrite devices.

When Philips closed its activity located in Hamburg, Valvo Bauelemente GmbH continues this circulator and isolator business and started 1999 as an independent company, only 100 meters off the former Philips location.

AT ancient times VALVO was an components office of PHILIPS then the converted to the above company was started and the previous closed.

The Valvo GmbH celebrates on 1 1974 April its 50th anniversary. She is one of the largest component manufacturers in Germany and today supplies - with few exceptions - all electronic components for the consumer electronics and professional electronics.

The company's history began in 1924 - a year after the introduction of broadcasting in Germany - with the establishment of a radio ray tube factory by the Hamburg company CHF Müller. Benedictines built many companies that produced radio tubes and the brand "Valvo" one of the few that are pervasive in the long run. 1927 joined CHF Müller and radio tube factory with Philips companies, and the tube manufacturing was relocated to a suitable site in Hamburg-Lokstedt. Already in the 30s advanced to the manufacturing program to electrolytic capacitors, speakers, and special tubes Hochohmwiderstände.

The Development of the present comprehensive Valvo organization began after the war. In Hamburg-Lokstedt bigger and modern factory buildings for the manufacture of electron tubes were built in Hamburg-Stellingen began with the manufacture of ceramic capacitors, which was then developed into a long horn on, and in Herborn founded Philips is later taken over by Valvo work for Electrolyte and plastic film capacitors.

Valvo 1951, the production of ceramic magnetic components. The set up for this new manufacturing plant in Hamburg was already the largest of its kind in Germany. With the broadcast of the first experimental television broadcasts Began in 1951, the manufacture of television picture tubes. From these first attempts gave rise to the Bildröhrenfabrik Aachen, which is now the largest color picture tube plant in Europe. 1953 with the introduction of semiconductor technology in Hamburg-Lokstedt a key step in a new era has been done. From the radio tube factory, the tubes and semiconductor plants.

The sales departments have since 1955, a private office building in Hamburg, Valvo-house. They are supported by six branch offices in the care of professional clients. In addition, sales contracts are entered into with 13 distributors.

To Valvo organization in which more than 8000 employees, which are now the four works: the tubes and semiconductor plants in Hamburg, the Hamburg factory for electronic components, the Bildröhrenfabrik Aachen and the capacitors work Herborn. These large manufacturing plants pose a significant production potential; its importance is enhanced by cooperation with 120 components factories in 30 countries as part of the Philips company, including the Valvo GmbH is a subsidiary of the General Association of German Industry Philips (Alldephi).

Valvo has done in its 50-year history many contributions to the development of electronic engineering in Germany. In the radio tube factory in Hamburg, including the first Acid-tubes, the first German multigrid tubes as well as the first tube types for ac heater was manufactured in series. In the picture tube technique with the rectangular tube in standardized aspect ratio, of the 110 ° deflection and the picture tube, which can be operated without additional protective glazing, remarkable improvements have been introduced. Today, the partnership offered by Valvo "European television technology", under which one understands the euro color picture tubes and Ablenktechnik with strand wound saddle coils enforced. The latest development is the picture tube with Schnellheizkatoden. From the large number of special tube developments here only Hochleistungsklystron should be mentioned that works in many of the UHF television channels at home and abroad.

Also for semiconductors Valvo could play a key role early on. For example, in 1954, brought out types OC 70, OC 71 were first available in large quantities alloyed junction transistors on the German market, and the diffusionslegierten POB transistors (pushed out base) extended from 1959 the scope of the transistor in the FM area. A striking example of the successes of modern semiconductor technology, the close tolerance varicap BB 105, with which the automatic tuning for FM and TV reception could be solved economically justifiable.

1967 originated in Hamburg analog integrated circuits. They were among the first of such products manufactured in Europe. Today Valvo has a leading position in the field of integrated circuits for color televisions. The second generation of these circuits is already matured. It contributes significantly to the reduction of the number of individual components and the necessary adjustment processes. Also numerous radio receiver as part of a progressive circuit design, advanced integrated circuits are available.

On the development of soft and hard magnetic oxide ceramic materials has been working steadily in recent decades, for example, would be the 110 °-Ablenktechnik without the high magnetic quality and dimensional accuracy of modern yoke rings from "Ferroxcube 3C2" not have been possible. For line transformers and modern power transformer, the new material "Ferroxcube 3C8" was introduced, and in the area of ​​hard magnetic materials are "ferroxdure 380", "ferroxdure 260" and "ferroxdure 270" available.

On this basis, the broad technical Valvo GmbH presents its 50th anniversary as one of the leading suppliers of electronic equipment industry with a large production capacity and with the most modern technical equipment - a solid foundation for the further development of the position it has reached today.

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Die Valvo GmbH begeht am 1. April 1974 ihr 50jähriges Firmenjubiläum. Sie ist einer der größten Bauelementehersteller in Deutschland und liefert heute - von wenigen Ausnahmen abgesehen - sämtliche elektronischen Bauelemente für die Konsumelektronik und die professionelle Elektronik.

Die Geschichte des Unternehmens begann 1924 - ein Jahr nach der Einführung des Rundfunks in Deutschland - mit der Gründung einer Radioröhrenfabrik durch die Hamburger Röntgenfirma C. H. F. Müller. Damals entstanden viele Firmen, die Radioröhren herstellten; die Marke "Valvo" gehört zu den wenigen, die sich auf die Dauer erfolgreich behaupten konnten. 1927 schlossen sich C. H. F. Müller und die Radioröhrenfabrik den Philips-Unternehmen an, und die Röhrenfertigung

wurde auf ein geeignetes Gelände in Hamburg-Lokstedt verlagert. Schon in den 30er Jahren erweiterte man das Fertigungsprogramm auf Elektrolytkondensatoren,Lautsprecher,Hochohmwiderstände und Spezialröhren.

Der Ausbau zur heutigen umfassenden Valvo-Organisation setzte nach dem Kriege ein. In Hamburg-Lokstedt wurden größere und moderne Fabrikgebäude für die Herstellung von Elektronenröhren errichtet, in Hamburg-Stellingen begann man mit der Fertigung von Keramik-Kondensatoren, die dann in Langenhorn weiter ausgebaut wurde, und in Herborn gründete Philips ein später von Valvo übernommenes Werk für Elektrolyt- und Kunststoffolien-Kondensatoren.

1951 nahm Valvo die Produktion keramischer magnetischer Bauteile auf. Das für diese Fertigung in Hamburg eingerichtete neue Werk war damals schon das größte seiner Art in der Bundesrepublik. Mit der Ausstrahlung der ersten Fernsehversuchssendungen

1951 begann auch die Herstellung von Fernsehbildröhren. Aus diesen ersten Ansätzen heraus entstand die Bildröhrenfabrik Aachen, die heute das größte Farbbildröhrenwerk Europas ist. 1953 wurde mit der Einführung der Halbleitertechnik in Hamburg-Lokstedt ein entscheidender Schritt in eine neue Ära getan. Aus der Radioröhrenfabrik wurden die Röhren und Halbleiterwerke.

Die Vertriebsabteilungen haben seit 1955 ein eigenes Bürogebäude in Hamburg, das Valvo-Haus. Sie werden von sechs Zweigbüros in der Betreuung der professionellen Kunden unterstützt. Außerdem sind Vertriebsverträge mit 13 Distributoren abgeschlossen.

Zur Valvo-Organisation, in der mehr als 8000 Mitarbeiter beschäftigt sind, gehören heute die vier Werke: die Röhren- und Halbleiterwerke Hamburg, das Werk für elektronische Bauelemente Hamburg, die Bildröhrenfabrik Aachen und das Kondensatorenwerk Herborn. Diese großen Fertigungsstätten stellen ein erhebliches Produktionspotential dar; seine Bedeutung wird noch durch die Zusammenarbeit mit 120 Bauelementefabriken in 30 Ländern im Rahmen der Philips Unternehmen gesteigert, zu denen auch die Valvo GmbH als Tochter der Allgemeinen Deutschen Philips Industrie (Alldephi) gehört.

Valvo hat in seiner 50jährigen Geschichte viele Beiträge zur Entwicklung der elektronischen Technik in Deutschland geleistet. In der Radioröhrenfabrik Hamburg wurden unter anderem die ersten Acid-Röhren, die ersten deutschen Mehrgitterröhren sowie die ersten Röhrentypen für Wechselstromheizung serienmäßig gefertigt. In der Bildröhrentechnik sind mit der Rechteckröhre im normgerechten Seitenverhältnis, der 110°-Ablenkung sowie der Bildröhre, die ohne zusätzliche Schutzscheibe betrieben werden kann, bemerkenswerte Verbesserungen eingeführt worden. Heute hat sich die von Valvo angebotene "Europäische Fernsehtechnik", unter der man die Eurocolor-Bildröhren und die Ablenktechnik mit stranggewickelten Sattelspulen versteht, durchgesetzt. Die neueste Entwicklung ist die Bildröhre mit Schnellheizkatoden. Aus der großen Anzahl der Spezialröhrenentwicklungen sei hier nur das Hochleistungsklystron erwähnt, das heute in vielen UHF-Fernsehsendern des In-und Auslandes arbeitet.

Auch zur Halbleitertechnik konnte Valvo schon frühzeitig Entscheidendes beitragen. Zum Beispiel waren die 1954 herausgebrachten Typen OC 70, OC 71 die ersten in großer Stückzahl erhältlichen legierten Flächentransistoren auf dem deutschen Markt, und die diffusionslegierten POB-Transistoren (pushed out base) erweiterten ab 1959 den Anwendungsbereich des Transistors in das UKW-Gebiet. Ein markantes Beispiel für die Erfolge der modernen Halbleitertechnik sind die engtolerierten Abstimmdioden BB 105, mit denen die automatische Abstimmung beim UKW- und Fernsehempfang wirtschaftlich vertretbar gelöst werden konnte.

1967 entstanden in Hamburg integrierte Analogschaltungen. Sie gehörten zu den ersten derartigen in Europa gefertigten Produkten. Heute hat Valvo eine führende Stellung auf dem Gebiet der integrierten Schaltungen für Farbfernsehgeräte. Die zweite Generation dieser Schaltungen ist bereits herangereift. Sie trägt wesentlich zur Verringerung der Anzahl der Einzel-Bauelemente und der erforderlichen Abgleichvorgänge bei. Auch für Rundfunkempfänger werden zahlreiche im Rahmen eines fortschrittlichen Schaltungskonzeptes entwickelte integrierte Schaltungen angeboten.

An der Weiterentwicklung von weich und hartmagnetischen oxidkeramischen Werkstoffen ist in den letzten Jahrzehnten kontinuierlich gearbeitet worden; zum Beispiel wäre die 110°-Ablenktechnik ohne die hohe magnetische Qualität und Maßhaltigkeit moderner Jochringe aus "Ferroxcube 3C2" nicht möglich gewesen. Für Zeilentransformatoren und moderne Leistungsübertrager wurde der neue Werkstoff "Ferroxcube 3C8" eingeführt, und auf dem Gebiet der hartmagnetischen Werkstoffe stehen "Ferroxdure 380", "Ferroxdure 260" und "Ferroxdure 270" zur Verfügung.

Auf dieser breiten technischen Basis präsentiert sich die Valvo GmbH zum 50jährigen Firmenjubiläum als einer der bedeutendsten Zulieferer der elektronischen Geräte-Industrie mit einer großen Produktionskapazität und mit modernster technischer Ausrüstung - ein solides Fundament für den weiteren Ausbau der heute erreichten Position.

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