JPS6014457B2 - Exposure device for color picture tube - Google Patents

Description

[Detailed description of the invention] The present invention relates to an exposure apparatus for color picture tubes.

Generally, when manufacturing color picture tubes, a phosphor or photosensitive agent is applied to the inner surface of the face plate to obtain a phosphor screen with a so-called hole-type or stripe-type arrangement, or a similar arrangement for graphite coating for the so-called black matrix. A method is adopted in which exposure is performed through a shadow mask. Figure 1 shows the schematic configuration of such a general exposure device.As shown in the figure, the light emitted from a point ray 1 equal to the deflection position of the electron beam of the color picture tube is an electron beam. The face plate passes through a correction lens 2 that corrects the light to draw a trajectory similar to Light is projected onto the phosphor and photosensitizer coated on the inner surface.

In the figure, 6 indicates an ultra-high pressure mercury lamp as a light source, and 7 indicates a collimator as a condensing lens. It has been common practice to use such a device to project light onto the inner surface of the face plate with the light source fixed, but according to this method, the mercury lamp 6 serving as the light source is installed in the longitudinal direction. , 3rd
As shown in the figure, the illumination distribution on the inner surface of the face plate is bright in the longitudinal direction of the mercury lamp, and the rest is dark, resulting in an extreme difference.

FIG. 2 is a longitudinal side view of an exposure diamond used for fixed exposure as described above. The mercury lamp 6 and the collimator 7 are enclosed in a lamp house 8, and the inside of this lamp house is fed from a supply gutter pipe 9. The structure is such that the cooling medium is filled with water or air for cooling, and the cooling medium is led to the outside through a discharge pipe 10.

In order to reduce the difference in illuminance distribution on the face plate as much as possible, it is sufficient to correct it using the light amount correction filter 5, but in order to adjust the amount of light on the inner surface of the face plate to suit the purpose, This has the disadvantage that the overall illuminance has to be lowered, and therefore the light reception time becomes longer.

Therefore, by rotating the light source to improve this drawback, the difference in the amount of light on the inner surface of the face plate due to the arc image from the mercury lamp is reduced, and overall light intensity correction using a light amount correction filter is no longer necessary. A method has been proposed to improve the illuminance of light projected onto the inner surface of the faceplate. However, in a rotary exposure apparatus using such a rotating light source, since the light source rotates,
There is a problem in how to supply power and cooling medium to the light source section. The object of the present invention is to solve the above-mentioned conventional problems, and to provide an exposure apparatus for a color picture tube configured to sufficiently supply power to a light source section and supply a cooling medium. There is something to be gained.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the apparatus of the present invention will be explained below along with embodiments shown in the drawings. FIG. 5 is a longitudinal sectional side view of the device of the present invention, in which reference numeral 11 indicates the device body, which has a plate 12 on its upper surface for positioning and placing the face plate 3 thereon. Reference numeral 13 denotes a ring-shaped insulator fixed to the lower part of the inner surface of the screen 11, and a slip ring 14 made of a good conductor is arranged in the same circular shape on the upper surface.
, 15 are fixed.

An insulating ring 17 is fixed to the base of the rotating light source section 16 at a position facing the slip rings 14 and 15 at a certain distance from the slip rings so that leaked cooling liquid does not come into contact with the slip rings. Insulation ring 1
The slip rings 14 and 15 are placed at appropriate positions on the lower surface of 7.
Carbon brushes 18 and 19 are fixed correspondingly, and leads 20 and 21 come out from their connection terminals and are connected to the rotating light source section 16 and the mercury lamp 6, respectively. The reason why the slip rings 14 and 15 are fixed and arranged concentrically is to prevent the cooling liquid from leaking out and shorting the electrodes when replacing the mercury lamp 6 of the light source section 16. The cooling medium of the light source section 16 is the rotary joint 22.
It is configured so that it can be supplied via. 23 indicates a motor for rotational driving.

Since the present invention is configured as described above, it is possible to supply power and a cooling medium to the rotating light source section.

As is clear from the above description, according to the present invention, the structure is such that power and cooling medium can be stably supplied to the rotating light source, so that the inner surface of the face plate during exposure is It is possible to emit a stable exposure light beam that is less affected by archimage, and it is possible to stabilize and improve the quality of exposure and shorten the exposure time by improving illuminance, resulting in a high-quality color picture tube. There are effects such as being able to.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional exposure device, Fig. 2 is a longitudinal cross-sectional side view of the light source section of a fixed light source exposure pupil, and Fig. 3 is a diagram of illuminance distribution on the face plate by the conventional exposure device. 4 is an illuminance distribution diagram showing an example of the illuminance distribution on the face plate obtained by the apparatus of the present invention, and FIG. 5 is a longitudinal sectional side view of an embodiment of the apparatus of the present invention. 11... Device cliff body, 12... Plate, 1
3... Insulator, 14, 15... Slip ring, 16... Rotating light source section, 17... Insulating ring, 18, 19... Carbon brush, 20, 21 …
...Lead wire, 22...Rotary joint, 23...Motor. Figure 2 Figure 3 Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] 1. A rotating light source section rotatably provided in a housing, an insulating ring fixed to the base of the rotating light source section, a power supply device supplying power to the rotating light source section, and a cooling device for supplying power to the rotating light source section. a cooling medium supply device for supplying a medium, the insulating ring forming a part of the power supply device and shielding the device from the cooling medium leaking from the rotating light source section. Tube exposure device.