JPH09320494A - Color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely receive index signal beams by the whole respective areas in the index system color picture tube in which one fluorescent screen is divided into plural ones so as to be scanned. SOLUTION: In this color picture tube, support bodies 15 each tip end at the side of a face plate of which is in a wedge shape, are disposed in a space between the face plate 1 and a rear plate 3, and a screen part 11 provided with index signal generating fluorescent substance layers formed in the inner surface of the face plate, is divided into plural areas so as to be scanned. In this case, in the vicinity of a boundary part adjacent to a beam receiving part in the horizontal direction, each support body is disposed over the boundary part of the area adjacent in the horizontal direction in response to the aforesaid beam receiving part, and each conducting passage through which signal beams from the index signal generating fluorescent substance layers are transmitted to an area from the tip end part at the side of the screen part 11 over to the bottom part at the rear plate 3 side, is provided for the support bodies 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an index type color picture tube in which a phosphor screen is divided into a plurality of regions and scanned by electron beams emitted from a plurality of electron guns.

[0002]

2. Description of the Related Art Generally, in a color picture tube, a shadow mask is arranged so as to face a phosphor screen composed of dot-shaped or stripe-shaped three-color phosphor layers which emit blue, green, and red light. A shadow mask type color picture tube for selecting an electron beam incident on a color phosphor layer has been widely put into practical use. However, in this shadow mask type color picture tube, since the electron beam transmittance of the shadow mask is as low as about 20%, the luminous efficiency of the phosphor with respect to the energy of the entire electron beam emitted from the electron gun is low, and the color image receiving This is an obstacle to increasing the brightness of the tube. Further, the loss of the electron beam in the shadow mask becomes heat energy and heats the shadow mask. Therefore, in the shadow mask containing iron as a main component, the shadow mask is thermally expanded, and the color shift is lowered due to the positional deviation. There is a problem.

As a color picture tube capable of avoiding the above problems of the shadow mask type color picture tube, there has conventionally been an index type color picture tube. In this index type color picture tube, in addition to a stripe-shaped three-color phosphor layer for displaying an image, a phosphor layer for generating an index signal is provided on a phosphor screen, and the index signal is generated by scanning an electron beam. The color switching is performed by detecting the scanning position of the electron beam by receiving the index signal light obtained from the fluorescent layer for use in the light receiving portion.

According to the color cathode ray tube of the index system, since there is no shadow mask, it is possible to increase the brightness. However, in this index type color picture tube,
The spot diameter of the electron beam scanning the phosphor screen needs to be equal to or smaller than the width of the stripe of each color phosphor layer over the entire phosphor screen.

However, in general, the larger the color picture tube, the longer the distance from the electron gun to the phosphor screen, and the larger the electron optical magnification of the electron gun. It becomes difficult to reduce the spot diameter of the electron beam. Therefore, a large index type color picture tube has not yet been put to practical use.

As a method for increasing the size of the index type color picture tube, Japanese Patent Publication No. 4-53067 discloses a structure in which a plurality of small index type color picture tubes are properly arranged to form an integral structure. There is shown an index type color picture tube in which one phosphor screen formed in the above is divided into a plurality of regions and scanned by an electron beam emitted from a plurality of electron guns. According to this method, it is possible to enlarge the screen without increasing the overall length, and by utilizing the advantage of the index method, it is possible to obtain a high-luminance and large-sized color picture tube.

By the way, in such a color picture tube,
In the case where the face plate provided with the phosphor screen and the rear plate facing the face plate are flattened to reduce the weight, a support for supporting an atmospheric pressure load applied to each of the face plates and the rear plates. Are placed. This support is formed in a wedge shape with its tip end aligned with the longitudinal direction of the stripes of the stripe-shaped three-color phosphor layer forming the phosphor screen,
It is arranged so that its tip is located on the black stripe provided between the phosphor layers of the respective colors.

Further, in this color picture tube, in order to distinguish it from the index signal of the adjacent area, photoelectric conversion is performed to receive the index signal light from the phosphor layer for generating the index signal on the rear plate corresponding to each area. Sections are provided.

However, in such a color picture tube, the support can be arranged only in a limited narrow area of the boundary between adjacent regions. Moreover, although the tip of the support is formed in a wedge shape, there is a problem that the tip blocks the index signal light and the necessary index signal light does not reach the light receiving portion sufficiently.

In this case, if the tip of the support is made more acute, the shadowed portion of the index signal light can be reduced, but it is difficult to make the angle sufficiently acute in view of the strength of the support.

[0011]

As described above, one index screen integrally formed is divided into a plurality of regions by the electron beam emitted from a plurality of electron guns and scanned. A color picture tube has been proposed, and by arranging a support between the face plate and the rear plate of this color picture tube, a high-luminance, lightweight and large-sized color picture tube can be constructed.

However, in such a color picture tube, the arrangement position of the support body is limited to a narrow range, and the tip of the wedge-shaped support body shields the index signal light. There is a problem that the index signal light does not reach the light receiving section sufficiently.

The present invention has been made to solve the above-mentioned problems, and it is possible to realize high brightness, light weight and large size by scanning one integrally formed screen portion by dividing it into a plurality of areas. It is an object of the present invention to ensure that the index signal light can be received over the entire area of each possible index type color picture tube.

[0014]

A substantially rectangular flat face plate, a side wall extending substantially perpendicularly from the face plate, and a substantially rectangular flat face parallel to and facing the face plate through the side wall. A vacuum envelope having a transparent rear plate, a support body disposed between the face plate and the rear plate and formed in a wedge shape on the face plate side, and a striped 3 formed on the inner surface of the face plate. A screen portion having a color phosphor layer and an index signal generating phosphor layer, arranged on the rear plate side, a light receiving portion for receiving signal light from the index signal generating phosphor layer, and arranged on the rear plate side. In a color picture tube including a plurality of electron guns that scan the screen section by dividing it into a plurality of areas, the light receiving section is arranged horizontally. Contact is disposed near the boundary of the region,
Corresponding to this light-receiving portion, a support is arranged on the boundary between horizontally adjacent regions, and the support is provided from the phosphor layer for generating an index signal from the tip on the screen side to the bottom on the rear plate side. A conduction path for transmitting signal light is provided.

Further, the conduction path is a through hole penetrating from the tip to the bottom of the support.

Further, the conducting path is composed of an optical conducting element provided from the tip to the bottom of the support.

Further, a light condensing portion is provided at the tip of the photoconductive element located on the screen portion side.

Further, the same number of conductive paths as the number of regions adjacent to one support are provided.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1B is a perspective view of the color picture tube, which is one form thereof, seen from the face plate side in FIG.
2 is a perspective view seen from the rear plate side, and FIG.
A sectional view taken along line AA of (a) and a sectional view taken along line BB of FIG. 1 (a) are shown in FIG. 2 (b).

This color picture tube is bonded to a substantially rectangular flat glass face plate 1 having a horizontal axis and a vertical axis and a peripheral portion thereof substantially perpendicular to the face plate 1. A side wall 2, a substantially rectangular flat glass rear plate 3 that is joined to the face plate 1 so as to face the side plate 2 in a substantially parallel manner, and a plurality of rear plate 3 provided on the rear plate 3. A total of 12 funnels 4 in the horizontal direction (X axis direction) and 3 in the vertical direction (Y axis direction), and a neck 5 provided on each funnel 4. It has an envelope.

As shown in FIG.
As shown in FIG. 3, a set of vertically elongated striped three-color phosphor layers B, G, and R that emits blue, green, and red is set as
The three-color phosphor layers B, G, R are formed in parallel in a plurality of rows in a horizontal direction at a predetermined arrangement pitch, and each of the phosphor layers B, G, R
Light absorption layer 8 in a stripe shape vertically elongated between G and R
And a metal back phosphor screen provided with an aluminum vapor deposition film 9 on the back surface of the phosphor layers B, G, R and the light absorption layer 7, and a predetermined horizontal direction through the aluminum vapor deposition film 9. A screen section 11 having at least a three-color phosphor layer B, G, R in parallel with the light absorption layer 7 at an arrangement pitch and a vertically elongated stripe-shaped index signal generating phosphor layer 10 formed in parallel with each other. Is provided.

An electron gun 12 is provided in each of the necks 5 provided in the plurality of funnels 4.

Then, the electron beam emitted from each electron gun 12 is horizontally and vertically deflected by a magnetic field generated by a deflecting device 13 mounted on the outside of each funnel 4, and a plurality of screen portions 11 are produced. Area R, four areas in the horizontal direction and three areas in the vertical direction in the illustrated example, a total of 12 areas R
The scan is divided into 1 to R12. By this scanning, each area R
The images drawn by 1 to R12 are connected by a signal applied to the electron gun 12 and the deflecting device 13, and one large image without a break is displayed on the entire surface of the screen portion 11.

Further, in this color picture tube, as shown in FIG. 4, the areas R1 to R12 adjacent to each other in the horizontal direction are provided.
A plurality of support members 15, nine support members 15 in the illustrated example, are arranged on the central portion of the boundary portion of. These supports 15 are for supporting the atmospheric pressure load applied to the flat face plate 1 and the rear plate 3 of the vacuum envelope, the bottom part is fixed to the rear plate 3, and the tip part is formed in a wedge shape. , The wedge-shaped tip portion is the screen portion 1
It consists of a metal column that abuts on 1. In particular, in this embodiment, as shown in FIG. 5, the support member 15 extends from the inclined surface 16 of the wedge-shaped tip portion to the bottom portion of the support member 15,
Two independent through holes 17 are provided for transmitting the signal light from the index signal generating phosphor layer described later. The through hole 17 constitutes the conduction path of the present invention, and the side wall of the hole is a reflecting surface that efficiently reflects light. The reflection on the side wall of the hole can be a preferable reflection surface that reduces light loss by forming a vapor deposition film of aluminum or the like.

Further, the rear plate 3 is provided with a pair of light receiving windows (not shown) capable of transmitting light on both sides in the horizontal direction with the respective funnels 4 interposed therebetween, and the light receiving windows are provided outside the respective light receiving windows. Corresponding to the plurality of regions R1 to R12, a pair of light receiving portions 18 for detecting and photoelectrically converting the signal light from the index signal generating phosphor layer is provided. The positions of the light receiving window and the light receiving portion 18 are in the vicinity of the positions corresponding to the boundaries of the regions R1 to R12 on both sides in the horizontal direction.

Furthermore, in this color picture tube, each of the regions R1 to R12 is prevented so that the signal light from the index signal generating phosphor layers in each of the regions R1 to R12 does not enter the photoelectric conversion section 18 corresponding to the adjacent region. A shield 1 extending vertically from the rear plate 3 in the direction of the face plate 1 with the support 15 sandwiched between the horizontal and vertical boundaries of R12.
9 are arranged.

Here, in order to clarify the gist of the present invention, the relationship among the index signal generating phosphor layer 10, the support 15, and the light receiving portion 18 will be described.

As shown in FIG. 4, the light receiving portion 18 is arranged in the vicinity of a position corresponding to the boundary portions on both sides in the horizontal direction of the respective regions R1 to R12. This is necessary in order to switch the color by detecting the signal light obtained from the phosphor layer for generating the index signal by irradiating the electron beam for scanning by dividing the screen portion into a plurality of regions R1 to R12. In the illustrated example, two light receiving portions 1 are provided for each of the regions R1 to R12.
8 are arranged, but if necessary, the number may be two or more, or may be two or less. In particular, the light receiving portions 18 arranged in the vicinity of the positions corresponding to the boundaries between the horizontally adjacent regions R1 to R12 are adjacent to each other in the respective regions R1 to R12 so as not to be on the adjacent regions beyond the boundaries. It is located close to the bottom of the support 15 arranged on the center of the boundary between the regions R1 to R12.

In addition to the arrangement of the light receiving section 18, a shield 19 is provided on the boundary between the regions R1 to R12 in order to avoid receiving the signal light from the index signal generating phosphor layer in the adjacent region. The arrangement is as described above.

By the way, when the support 15 and the light receiving portion 18 are arranged as described above, as shown in FIG. 6, in the case of the conventional support 15a having only a wedge-shaped tip, the support 15a is Phosphor layer 1 for generating index signals nearby
The signal light 21 from 0 may be blocked by the support 15a, and the light receiving unit 18 may not be able to sufficiently receive the signal light 21.

However, the support 1 in the above embodiment
As shown in FIG. 5, from the inclined surface 16 of the wedge-shaped tip portion to the support 1
When two independent through holes 17 for transmitting the signal light from the index signal generating phosphor layer are provided to the bottom of No. 5, as shown in FIG. 7, the index signal generating phosphor layer near the support 15 is provided. The signal light 21 from 10 can also be guided to the photoelectric conversion unit 18. That is, when the through hole 17 is provided as described above, a part of the signal light 21 from the index signal generating phosphor layer 10 near the support 15 is
As shown by 21a, it can be taken in from the opening of the inclined surface 16, repeatedly reflected by the side wall of the through hole 17, and guided to the light receiving portion 18 arranged at the position corresponding to the bottom thereof.

Therefore, with the above-described structure, the signal light from the phosphor layer for generating an index signal, which is conventionally blocked by the support, has sufficient intensity to receive the light receiving portion 18.
Can be made to receive light. In addition, since the two through holes 17 that are open to the inclined surfaces 16 on both sides of the wedge tip are provided independently, the signal light 21 from the phosphor layer 10 for generating the index signal in the adjacent region is mistakenly taken in. In this case, the light can be guided to the photoelectric conversion units 18 arranged at the corresponding positions.

In the above embodiment, a through hole is provided in the support as a conduction path for signal light from the index signal generating phosphor layer in the support, but as shown in FIG. The photoconductive element 22 may be arranged from the inclined surface 16 of the wedge-shaped tip portion to the bottom portion, and the photoconductive element 22 may be used as a conductive path. The optical conducting element 22 is preferably an optical fiber 23, and as shown in FIG. 8B, a condenser lens 24 for condensing the signal light from the index signal generating phosphor layer is provided at the tip of the optical fiber 23. By arranging them, the signal light can be efficiently guided to the light receiving section.

The photoconductive element 22 shown in FIG.
It is also possible to form the tip end of the optical fiber 23 into a hemispherical shape as shown in FIG.

Further, in the above-mentioned embodiment, the support is arranged on the center of the boundary between the horizontally adjacent regions. However, if the support is on the boundary, the support is displaced from the center. May be.

Particularly, the supports are horizontally and vertically adjacent to each other.
In the case of arranging in the corner portion of one region, it is possible to correspond to four regions by providing four through holes.

[0038]

As described above, the substantially rectangular flat face plate, the side wall extending substantially vertically from the face plate, and the substantially rectangular parallelepiped faced in parallel with the face plate through the side wall. A vacuum envelope having a flat rear plate, a support body disposed between the face plate and the rear plate and formed in a wedge shape on the face plate side, and a stripe-shaped support formed on the inner surface of the face plate. A screen portion having a three-color phosphor layer and an index signal generating phosphor layer, a light receiving portion arranged on the rear plate side and receiving signal light from the index signal generating phosphor layer, and a light receiving portion arranged on the rear plate side. In a color picture tube including a plurality of electron guns that divide the screen portion into a plurality of regions and scan, the light receiving portion is horizontally Contact is disposed near the boundary of the region,
Corresponding to this light-receiving portion, a support is arranged on the boundary between horizontally adjacent regions, and the support is provided from the phosphor layer for generating an index signal from the tip on the screen side to the bottom on the rear plate side. By providing a conductive path for transmitting the signal light and further configuring the conductive path with a through hole or a photoconductive element, the signal light from the index signal generating phosphor layer can be reliably detected over the entire surface of each region. A high-luminance, lightweight and large-sized color picture tube can be constructed.

[Brief description of drawings]

FIG. 1 (a) is a front side perspective view showing the configuration of an index type color picture tube which is an embodiment of the present invention, and FIG. 1 (b) is a rear side perspective view of the same.

2 (a) is a sectional view taken along line AA of the index type color picture tube shown in FIG. 1 (a), and FIG. 2 (b) is a sectional view taken along line BB.

3 (a) and 3 (b) are diagrams showing a configuration of a screen portion of the index type color picture tube, respectively.

FIG. 4 is a diagram showing an arrangement of a support and a light receiving section of the index type color picture tube.

FIG. 5 is a diagram showing a structure of the support.

FIG. 6 is a view for explaining the action of the support in the embodiment of the present invention and the action of the conventional support shown for comparison.

FIG. 7 is a view for explaining the action of the support body in the embodiment of the present invention.

FIG. 8 (a) is a diagram showing a different structure of a support according to an embodiment of the present invention, and FIG. 8 (b) is a diagram showing a structure of a photoconductive element arranged on the support. .

FIG. 9 is a diagram showing a different structure of the photoconductive element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 2 ... Side wall 3 ... Rear plate 4 ... Funnel 5 ... Neck 8 ... Light absorption layer 10 ... Index signal generating phosphor layer 11 ... Screen section 12 ... Electron gun 15 ... Support 18 ... Light receiving section B, G , R ... Three-color phosphor layer R1 to R12 ... Region

Claims (5)

[Claims] 1. A substantially rectangular flat face plate,
A vacuum envelope having a side wall extending substantially vertically from the face plate and a substantially rectangular flat rear plate facing the face plate in parallel through the side wall, and the face plate and the rear plate. And a stripe-shaped three-color phosphor layer adhered to the inner surface of the face plate and an index signal generating phosphor layer. Section, the light receiving section arranged on the rear plate side and receiving the signal light from the index signal generating phosphor layer, and the light receiving section arranged on the rear plate side and dividing the screen section into a plurality of regions. In a color picture tube including a plurality of scanning electron guns, the light receiving section is arranged in the vicinity of a boundary between horizontally adjacent regions, Corresponding to the light receiving portion, the support is arranged on the boundary between the horizontally adjacent regions, and the support is provided with the index signal generating phosphor layer from the tip on the screen side to the bottom on the rear plate side. A color picture tube characterized in that a conduction path for transmitting signal light from the picture tube is provided. 2. The color picture tube according to claim 1, wherein the conductive path is formed of a through hole penetrating from the tip to the bottom of the support. 3. The color picture tube according to claim 1, wherein the conducting path is composed of an optical conducting element provided from the front end to the bottom of the support. 4. The color picture tube according to claim 3, wherein a condensing section is provided at the tip of the photoconductive element located on the screen section side. 5. The color picture tube according to claim 1, wherein as many conducting paths as the number of areas adjacent to one support are provided.