DE2625905A1 - ELECTRICAL CONNECTION DEVICE IN COLOR TELEVISION TUBES - Google Patents

Description

1 BERLIN 33 ₈ MUNICH

Auguste-Vikioria-Strasse 65 _ n || _C p _U i / r ο DADTMI = D PienzenauerstraBe 2

Pat. Dr. Ing. Ruschke Ul ". KUbUHKt & PARTNER _D ,. _.,.

Pat -Anu / ΠίηΙ -Inn Pat.-Anw. Dipl.-lnq.

oiaf RÜÄ ⁹ · PATENTANWÄLTE ^{Hans Ε} · ^RusÄke

Telephone: 030/8 | 38 95 BERLIN - MÖNCHEN Telephone: 089 / «» »

Telegram address: 089/649 2806

Quadrature Berlin Telegram address:

TELEX: 1 83 786 Quadrature Munich

TELEX: 522767

Zenith Radio Corporation, Chicago, Illinois, Y, St. A,

Electrical connection device in color television picture tubes

The present invention relates generally to color television tubes of the shadow mask ty ρ s and in particular a device and a System for establishing an electrical connection between the anode connection of the picture tube, which is arranged on the piston, and its Shadow mask and screen.

Usually color television tubes have a glass bulb with a Funnel and a front plate and an electron gun arranged in the neck of the funnel, which represents the electron source. The faceplate has a concave inner surface on which the electron excitable phosphor screen is deposited. There is a layer of aluminum on the back of the fluorescent screen. A shadow mask assembly with a rigid one Frame and a mask made of perforated sheet steel is attached to the

609851/0857

Front panel attached with a multitude of spaced leaf springs, which attack metal nozzles that are embedded in the inner surface of the front panel. Electrically conductive coating which is usually graphite, is applied to the inner surface of the funnel; on this coating a high voltage is applied from an external source via an anode connection in the funnel wall.

In operation, the shadow mask and the aluminum layer on the screen of I ¹ are usually arbfernsehbildröhre to the same potential set as the conductive funnel coating; typically the mask is electrically connected directly to the coating. In most prior art systems, the electrical connection between the funnel coating and the mask is made by one or more contact springs attached directly to the frame of the shadow mask and extending to the conductive coating when the funnel and faceplate are assembled are; in this way the electrical connection is finally established. The electrical contact between the mask and the screen takes place via leaf springs that carry the mask arrangement, the nozzle carrying the mask and a conductive "beard" in the form of a paint application between the nozzle and the aluminum layer (or the black border layer in the case of tubes of the matrix Design type) . It should be noted here that in most prior art systems, the electrical

B098S1 / 0SS?

Connection between the conductive funnel coating and the Screen takes place via the shadow mask arrangement itself and only exists when the shadow mask is in its operating position. Contact springs of this type are disclosed in U.S. Patents 3,541,373 and 3,377,493.

A connector between the funnel and a Screen that is in a cathode ray tube with post acceleration can be used is disclosed in U.S. Patents 3,876,898 and 3,876,899. These connecting devices bypass the frit seal and connect the screen to a second anode connector in the funnel so that the screen can be placed on a different potential than the color selection electrode closest to the screen.

While this invention has general applicability, it is most advantageously applicable to color television picture tubes of a particular type use, namely for those with perforated masks that are not inherently rigid and that are suspended from nozzles in the faceplate. Preferably the perforated mask, which is not inherently rigid, is designed without a frame. It turned out to be impractical, a contact spring put directly on such a mask, since the restoring forces of the spring can lead to a deformation of the mask. In addition, it is undesirable to weld a contact spring to a perforated mask that is not inherently rigid, since the mask is very sensitive and is easily deformed "Furthermore, welding

B09851 / 0857

- 4 splashes of material clog the mask openings.

The present invention relates to an electrical connector for use with a color television picture tube having a flangeless display panel, an electron excitable phosphor screen on the inner surface thereof and an electrically conductive layer on the back of the phosphor screen applied electrically conductive coating and an ^{anode connection extending through the Y, r} and of the glass funnel, which is in electrical connection with the electrically conductive coating in the funnel, the connecting device having an electrically conductive element which protrudes from the inner surface of the screen plate to support the shadow mask on the inner surface of the display panel, as well as an electrically conductive contact spring which is mechanically and electrically fastened with a first end to the element on the display panel, wherein the F Eder protrudes from the element in such a way that its opposite end rests resiliently against the Trichterinnenbe coating when the funnel and faceplate are put together v / ground. In this way, an electrical current flow path from the anode connection to the conductive layer on the front panel is created which bypasses the mask.

The present invention further relates to an electrically conductive contact spring for use with a Parbfernsehbild-

609851/08 5?

tube with a flangeless faceplate on its inner surface applied fluorescent screen that can be excited by electrons and one on the back of the fluorescent screen provided electrically conductive layer and with at least one electrically conductive shadow mask support element, which is supported by the Inside surface of the faceplate protrudes and is in electrical connection with the electrically conductive layer. Farther The picture tube has a glass funnel with an on an inner surface of the same applied electrically conductive coating and with a diffusing through a *, 7and of the glass funnel Anode terminal which is in electrical connection with the electrically conductive funnel coating. The electric Conductive contact spring has a sleeve-like lower part which slidingly engages the element on the front panel with a friction fit, and a spring element which protrudes from the lower part and When the funnel is assembled with the front plate, it rests resiliently against the inner coating in the funnel.

With the present invention it is now possible to use an electrical Connection between the conductive inner funnel coating and to produce the screen independently of the shadow mask to be attached to the mask so that it can no longer be deformed or clogged by weld spatter.

Further features of the present invention emerge from FIG

609881/0857

262S905

following description of a preferred embodiment of the The present invention in conjunction with the accompanying drawings, in which like reference numerals refer to like parts.

Figure 1 is a schematic perspective view of a color television picture tube embodying the present invention; FIG. 2 is a schematic partial side section of the picture tube according to FIG. 1 and shows the electrical connection from the anode connection on the glass funnel to the electrically conductive layer on the front panel;

FIG. 3 is an enlarged and partially sectioned view of the picture tube according to FIG. 1 and shows a novel contact spring, which is one aspect of the present invention; this figure also shows how the contact spring is resilient rests against the electrically conductive coating of the funnel; Figure 4 is an exploded perspective view of the picture tube Figures 1 to 3 and show hidden features of the faceplate and glass funnel; and

FIGS. 5 and 6 are enlarged perspective views of FIG Contact spring that is placed on the suspension socket for a perforated mask.

While the invention is different with color television picture tubes Type can be used, it preferably applies to a tube of the type shown in Figures 1 to 3. The tube 2 shown in Figures 1 to 3 is shown as having a modified one

609851/085?

Piston shown provided with a funnel 4, which is tight is placed on a flangeless front panel 6. This flangeless construction of the front plate 6 allows savings in the piston production as well as a simplified and economical design of the screen.

On the inner surface of the Prontplatte 6 there is a phosphor screen 7. While it is at 'the screen 7 to a a wide variety of configurations - such as _o a conventional dot screen - may act, he has in the illustrated embodiment, a G-rupp arrangement vertically Directed and horizontally repeating triple made of red, blue and green luminous material el again 8R, 8B and 8Gr. The screen is preferably implemented with negative protective tape and black matrix, as described in US Pat. No. 3,146,368. In this embodiment, a black grid 10 has a pattern of light-absorbing bands that separate the fluorescent elements 8R, ÜB and 8G- from one another. A thin layer 11 of electrically conductive material such as aluminum is applied to the phosphors 8R, 8B and 8G; the black grid 10 serves to conduct away electrons which would otherwise charge the screen, and acts as a mirror which reflects the light emitted by the phosphors towards the viewer.

The funnel 4 has an electrically conductive

609851/085 7

tende coating 5 (typically made of graphite). During operation the pipes are exposed to a high tension on this coating 5 an external source which has an anode connection 3 in the Funnel wall reaches the coating and also the electrically conductive layer 11 on the screen, as to be described will be. In this way, a field-free area is created inside the funnel 4.

A shadow mask 12 of the construction described below has a pattern of openings 14-. While other hole patterns can also be used are, the mask 12 is shown as provided with a so-called slit pattern, in which the openings H in the form rectangular slots exist in vertically directed rows, each slot of a row from its neighbor through one Web 16 is separated.

The perforated mask 12 is preferably a frameless one one-piece construction made of electrically conductive material such as sheet steel. One made in one piece with the actual mask Apron 18 gives this rigidity and shields the screen 7 from wild and overdriven electrons. The one-piece Shaped ribs 22, recess 20 and edge lip 24 give the mask 12 a certain degree in its major and minor axis Stiff, but also allow her to bend in their diagonals and thus twist errors in the assembled state Adjust the front panel.

B09851 / 085?

A specially designed suspension is also provided, spaced around the shadow mask 12 from the Iimenfläohe of the front plate 6

; ': *. c Au?'liäri; .ia \ preferably has four suspension elements 26, which are each arranged at the corners of the mask 12. As mentioned, the shadow mask 12 is designed so that it is relatively stiff with respect to its major and minor axis, but less stiff with respect to its diagonals. By attaching the suspension devices 26 to the corners of the mask 12, deviations in the shape of the faceplate between the individual picture tubes with respect to the diagonal of the faceplate cause the shadow mask 12 to bend accordingly, so that the Q distance, ie the distance between the perforated central part of the shadow mask 12 and the Inner surface of the front panel 6 carrying the screen 7 remains constant.

While numerous other arrangements are contemplated, in the preferred suspension illustrated, the suspension means include 26 each have a V / angle 28, which is attached to a corner of the mask, in a leaf spring 30 carries, which is relatively weak, but (in its own plane and in the direction of torsion) is relatively stiff. The spring is embossed with an x to increase the spring rate} but this feature is not absolute necessary. The spring 30 carries at its distal end a protrusion 32 that fits into an opening 34

ORIGINAL

609851/085?

in one attached to the front panel and electrically conductive Element or nozzle 36 engages when the mask 12 is on the front panel 6 in the operative position. Alternatively the projection 32 can be formed in one piece with the spring 30. The angle 28 is embossed with an undulation and if temperature compensation is required, it can be constructed and configured from side-bonded bimetal be that if the lens 12 is due to the electron bombardment heated and expands, the angle 28 bends and the shadow mask to the extent closer to the fluorescent screen that is necessary and sufficient to compensate for the expansion of the mask.

The connecting piece 36 (see FIGS. 5 and 6) is U-shaped with a surface 40 containing the projection receiving opening 34, and two legs 42, 44 with a shoulder 41 formed. The two legs 42, 44 are embedded in the front panel 6 or can be glued to it. The complained Legs 42, 44 allow the phosphor suspension poured onto the front plate to flow through the connector 36, without clogging it.

The openings 34 receiving the projections in three of the four nozzles % are arranged in a circle in a triangle ("circular in triangular") and determine the position of the mask 12 relative to the front plate 6. The opening 34 receiving the projections in the redundant fourth

B0985i / 0857

Port 36 is preferably parallel to the inner surface of the faceplate 6 extended so that the fourth projection has a Can seek equilibrium position and a disturbance of the mask position determined by the other three nozzle 36 can be avoided. To insert or remove the mask 12, the springs 30 are depressed until the projections 32 meet the openings 34 have left the nozzle 36.

As shown in Figure 1, the tube 2 has a neck 46 in which an electrode system is arranged. The electrode system can be constructed in many ways. In the illustrated embodiment, in which the mask is a slit mask that ^{works in conjunction with a "lines 11} screen, three separate electrode systems 54, 56, 58 produce three coplanar beams 60, 62, 64 which represent the red, blue and The electrode systems are accessed via the pins 66 in the base 68 of the tube.

A contact spring 9, which is an essential aspect of the present Invention, provides an electrical connection from one of the nozzles 36 to the funnel coating 5. Awake one Aspect of the present invention, the contact spring 9 provides a direct electrical connection from the anode terminal 3 to the electrical conductive layer 11 on the screen 7.

In particular, this electrical connection includes those on the

8 0 9 8 5 1/085?

Hüekseite of the fluorescent screen 7 located electrically conductive layer 11, the electrically conductive connecting piece 36 which is in electrical connection with the layer 11 and the An electrically conductive inner funnel coating applied to an inner surface of the glass funnel 4 and electrically connected to the anode connection 3 5 on. An electrically conductive contact spring 9 provides an electrical connection between the connecting piece 36 and the funnel coating 5 and creates a direct electrical current flow path from the anode terminal 3 to the conductive Layer 11o

Figure 2 shows schematically the direct electrical connection from the anode button 3 and the funnel coating 5 to the electrical conductive layer 11 on the fluorescent screen, 7. The conductive layer 11 is in electrical connection with the (or the) the contact spring (s) 9 carrying connector 36 brought by either extending the layer 11 until they reach the connector 36, or by placing an electrically conductive bridge between the nozzle and the inner surface of the front panel the layer 11 applies with conductive lacquer. Vfie shown in Figure 2, the contact spring 9 is attached to the connecting piece 36 by opening it this is postponed; it runs from the nozzle 36 to the funnel coating 5 and is resiliently applied to it, when the funnel 4 is assembled with the faceplate 6. If desired, the contact spring 9 on the connecting piece 36 can be applied to others ', Can be partially fastened - for example by welding.

B 09851/0857

The shadow mask 12 is electrically and mechanically connected to the nozzle 36 and receives potential from the direct electrical connection between the anode terminal 3 and the conductive layer 11 when the picture tube is in operation. This potential is essentially equal to the potential on the electrically conductive one Layer 11 of the screen 7. It must be emphasized that the contact spring 9 shows an electrical current flow path for both the phosphor screen 7 as well as for the perforated mask 12 offers. The phosphor screen 7 and the conductive layer 11 are, however regardless of whether the shadow mask 12 is in position or not, at the same potential as the internal coating 5.

Figure 3 shows a detail of the contact spring 9 in one assembled picture tube. The electrically conductive layer 11, which is applied to the phosphor screen 7, is like can be seen, in connection with the connecting piece 36 having attached. In the suspended state, the mask 12 receives the potential applied to the anode connection 3 via the electrical potential Connection between the funnel inner coating 5, the contact spring 9 and the connecting piece 36.

As shown in FIGS. 4 to 6, the contact spring 9 has a sleeve-like lower part 48 with a rectangular cross section on, which is placed on the connecting piece 36 with a sliding friction fit

809851 / 08ST

-H-

and therefore in intimate electrical contact with it stands. The lower part 48 is slightly larger than the nozzle 36 to telescope the lower part 43 from the outside onto the connecting piece 36 to be able to put on. Alternatively, a plug-in arrangement could be carried out if the connecting piece 36 and the lower part 48 slightly modified. In addition, a spring element 50 projects from the lower part 48 and is resiliently resilient to the conductive funnel inner coating 5 on the inner surface of the glass funnel 4 when the funnel 4 and the faceplate 6 assembled v / earth. The spring element 50 is preferably bifurcated in order to allow a higher current carrying capacity. The fork also makes the contact spring 9 more flexible. The contact spring 9 is preferably made of stainless steel.

Figure 4 is a perspective view showing how the goal plate and the glass funnel are assembled. The contact spring 9 is shown slipped onto one of the connecting pieces 36. That The free end 49 of the contact spring 9 is preferably cup-shaped, so that when the front plate 6 with the funnel 4 is assembled, the cup-shaped curved end 49 slides on the inner surface of the funnel 4 in the end position. The cup-shaped Arched end 49 prevents the conductive funnel inner coating 5 from being scratched. As can be seen in Figure 4, three corners of the glass funnel 4 are provided with notches 39, the connecting piece 36 to accommodate the Yorder plate 6 with

S09851 / 085 7

to align the funnel 4. A corner 37 of the glass funnel 7 has no notch 39 for a corresponding connecting piece 36. The contact spring 9 can therefore be unhindered during assembly slide along the inner surface of the funnel 4.

FIGS. 5-6 show the contact spring 9 pushed onto the connecting piece 36. The contact spring 9 is preferably provided with a locking tab 51 provided, which from the sleeve-like lower part 48 lies over a shoulder 41 on the connecting piece 36 and thus prevents that the contact spring 9 slips off the connecting piece 36.

The contact spring 9 preferably shows stop tabs 52 which are attached to the lower part 48 and prevent the Contact spring 9 slides down completely on the connection piece 36, and a certain position of the contact spring 9 on the connection piece 36 to set. The combination of the stop tabs 52 with the locking tab 51 prevents the contact spring 9 relative moved to the nozzle 36 so that they are in their desired position on this is fixed.

A shadow mask of the type shown in the application and executed here Art can be inserted or removed regardless of whether the contact spring 9 is slipped onto one of the connecting pieces 36 will. In other words: the contact spring 9 is completely independent of the perforated mask 12 ",

609851/08 5?

The invention is not limited to the structural details shown, and other modifications and applications are envisaged. Certain changes can be made to the arrangement described above without departing from the spirit and scope of the invention. E.g. /. the contact spring 9 can be configured differently and with or without stop or locking tabs «, the lower part 48 and the element 50 can be configured differently in order to adapt the spring to differently configured connecting pieces or differently configured tubular pistons. It can be used as a contact spring ₀ The subject matter of the above description should also be so construed as illustrative, not as a "limitation of the invention _β

B09851 / 0857

Claims (4)

- 17 P a t e η t a η s p_ r ü ο 3α e 1. Color television picture tube with a glass funnel with an electrical, conductive inner coating and one that runs through the funnel wall and is in contact with the inner coating Anode connection, with a front plate closing off the wide end of the funnel with an applied to its inner surface, fluorescent screen that can be excited by electrons and an electrically conductive one located on the back of the screen. Layer, with one attached to the faceplate Shadow mask and a connection arrangement that provides an electrical connection between the funnel coating and the Produces fluorescent screen, characterized in that the connecting device bypasses the perforated mask and an electrical having conductive element which protrudes inwardly from the flangeless front panel to the shadow mask on To hang up the screen with the conductive element in electrical connection with the electrically conductive layer on the Back of the screen is, and that an electrically conductive contact spring with a first end mechanically and electrically is attached to the conductive member on the face plate and protrudes from the conductive member h.er so that its opposite The end resiliently contacts the hopper liner while it is assembled with the faceplate Funnel bypasses the shadow mask * 609851/0857 2. Color television picture tube according to claim. 1, characterized in that that the electrically conductive contact spring has a sleeve-like lower part which slides from the outside and is frictionally engaged can be brought into engagement with the conductive element on the faceplate, and that a spring element from the base protrudes forth, and is resiliently resilient to the funnel coating when the funnel and faceplate are assembled. 3. color television picture tube according to claim 2, characterized in that the conductive element is configured with a rectangular cross section is and the sleeve-like lower part with one of the cross-sectional shape of the conductive element substantially matched rectangular cross-section is provided, which is, however, slightly larger so that the lower part telescopes from the outside with the conductive element can be engaged. 4. color television picture tube according to claim 3 »characterized in that that the lower part is welded to the conductive element. Ol / SGH 609851/0857