JPH05190093A - Color picture tube exposure device - Google Patents

Abstract

PURPOSE:To smooth the transmissivity distribution of a light adjusting filter, lessen demand and extend the life of a mercury lamp used for a color image receiving exposure device with a light transmission slit plate by allowing a slit, made in the slit plate, to be narrowed at the center and gradually widened toward both ends. CONSTITUTION:A slit 24 transverse to a mercury lamp 13 is made in a light transmission slit plate 24. The slit 24a is narrowed at the center and gradually widened toward the ends. In this way, the intensity of light from the mercury lamp 13 up to a panel can be distributed to be 60% or so at the ends if 100% at the center, so that brightness is 1.5 times more than usual at the center, resulting in better quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent screen exposure apparatus for a color picture tube, and more particularly to an exposure apparatus for improving the light intensity distribution during exposure.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional color picture tube exposure apparatus in which a lamp house 2 serving as a light source is a lamp house support 3
Further, the correction lens 4 is supported by the correction lens support base 5, and the dimming filter 6 is supported by the dimming filter support base 7. The panel support base 8 on which the support bases 3, 5, 7 and the panel 9 are placed is , Are fixed to the support frame 1 at predetermined intervals.

The correction lens 4 has a function of refracting the light emitted from the lamp house 2 by a desired amount in order to obtain a ray trajectory that matches the trajectory of the electron beam when the color picture tube operates. is there.

The light control filter 6 has a transmittance distribution that makes the distribution of light reaching the panel 9 a desired distribution. The light emitted from the lamp house 2 is the correction lens 4,
After passing through the dimming filter 6, the fluorescent screen 11 is formed by using the shadow mask 10 having a color selection function as a photomask.

3A and 3B are a front view and a sectional view of a lamp house 2 used in the conventional exposure apparatus shown in FIG. 2, respectively. A mercury lamp 13 as a light source and a light transmission slit plate 14 having a slit 14a are arranged in an outer frame 12 of the lamp house, and a glass plate 15 is provided on the upper surface.
It is closed by, and normally, water is flowing inside for cooling the mercury lamp 13.

[0006]

When the conventional lamp house shown in FIGS. 3 (a) and 3 (b) is used, the light intensity from the mercury lamp reaching the panel is expressed in the diagonal direction. When there is no filter, the light intensity distribution is shown in Fig. 4.
Assuming that the light intensity at the center is 100%, it becomes about 40% at the end of the diagonal axis.

In this state, it is impossible to form a phosphor having a uniform size over the entire phosphor screen, and therefore the light intensity distribution must be improved by the light control filter. For example, when equal light intensity is required over the entire screen, the light intensity distribution shown in FIG. 4 requires a transmittance distribution of the light control filter as shown in FIG. 5 by calculation.

This dimmer filter has a transmittance of 4 at the center.
0% and 100% at the end of the diagonal axis. Generally, when the difference in transmittance between the central portion and the end of the diagonal axis is large, some problems occur.

That is, since the central portion has a low transmittance, it is necessary to increase the absolute light intensity emitted from the lamp house, which causes problems such as increased power consumption, a shorter life of the mercury lamp, and increased power of the exposure power source, that is, increased equipment cost. There is a point.

Further, since the transmittance distribution becomes steep, it becomes difficult to manufacture the light control filter, and it becomes difficult to obtain a desired transmittance distribution. This means that it becomes more difficult to obtain uniform fluorescent film quality, and there is a problem that image quality is likely to deteriorate.

Therefore, it is necessary to make the transmittance distribution smoother in terms of design.

An object of the present invention is to provide a color picture tube exposure apparatus in which the transmittance distribution of a light control filter can be made smoother than in the past.

[0013]

In order to achieve the above object, a color picture tube exposure apparatus according to the present invention is a color picture tube exposure apparatus provided with a light transmission slit plate having a slit orthogonal to a mercury lamp. The slit plate has a slit whose central portion is narrow and whose outside is wider than the central portion.

Further, the slit shape of the light transmitting slit plate is such that it extends in an arc shape from the central portion to the outside.

Further, the slit shape of the light transmitting slit plate is a shape which linearly extends outward from the central portion.

[0016]

In the light transmitting slit plate, the slit is formed so that the outer side is wider than the central portion, thereby smoothing the light transmittance distribution.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 (a) is a front view showing a lamp house according to Embodiment 1 of the present invention, and FIG. 1 (b) is a sectional view of the same.

In FIG. 1, in this embodiment, the light transmitting slit plate 24 has a slit 24a arranged in a direction orthogonal to the mercury lamp 13, and the slit 24a has a narrow central portion and a wide outer portion. It is formed into a thing. In the illustrated embodiment, the opening edge of the slit 24a is formed in an arc shape so that the central portion is narrow and the outer side is wide.

The other structure is the same as that of FIG.

When the light transmission slit plate 24 as shown in FIG. 1 is used, the light intensity distribution from the mercury lamp that reaches the panel is shown in the direction of the diagonal axis. When the light intensity of is 100%, it becomes about 60% at the end of the diagonal axis.

As described in the conventional example, the transmittance distribution of the light control filter having the same light intensity distribution over the entire screen is as shown in FIG. This light control filter has a transmittance of 60% at the center and 100% at the end of the diagonal axis. The transmittance at the center is 1.5 times brighter than that of the conventional example, and the transmittance distribution is very high. Can be smooth. As a result, the conventional problems in terms of equipment, cost and quality can be greatly reduced.

(Second Embodiment) FIG. 8 is a front view showing a lamp house according to a second embodiment of the present invention.

In FIG. 8, in the present embodiment, in the light transmitting slit plate 34, the shape of the slit 34a is narrow in the central portion and wider in the outer portion than in the central portion.
The opening edge of 4a is linearly formed from the center toward the outside.

In this embodiment, the effect is almost the same as that of the first embodiment described above, but the light intensity distribution is slightly different.

That is, the shape of the slit 34a has an advantage that it can be optimally set depending on the size of the color picture tube, the curvature of the panel surface, and the shape of the correction lens.

[0027]

As described above, the present invention is required by making the slit shape of the light-transmitting slit plate narrow at the central portion and wider at the outside than the central portion. The transmittance distribution of the light control filter is less steep and smoother than the conventional one, and the facility and cost effects such as reduction of power consumption, extension of life of the mercury lamp, and reduction of equipment cost of the exposure apparatus are achieved. is there.

Further, since it is possible to introduce a light control filter which is easy to manufacture, that is, has a good quality, it is possible to improve the image quality.

[Brief description of drawings]

1A is a front view showing a lamp house according to a first embodiment of the present invention, and FIG. 1B is a sectional view of the same.

FIG. 2 is a diagram showing a color picture tube exposure device.

3A is a front view showing a lamp house according to a conventional exposure apparatus, and FIG. 3B is a sectional view of the same.

FIG. 4 is a diagram showing a light intensity distribution in a conventional exposure apparatus.

FIG. 5 is a diagram showing a transmittance distribution of a light control filter required in a conventional exposure apparatus.

FIG. 6 is a diagram showing a light intensity distribution in the exposure apparatus of the present invention.

FIG. 7 is a diagram showing a transmittance distribution of a light control filter required in the exposure apparatus of the present invention.

FIG. 8 is a front view showing a lamp house according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Support Frame 2 Lamphouse 3 Lamphouse Support 4 Correction Lens 5 Correction Lens Support 6 Light Control Filter 7 Light Control Filter Support 8 Panel Support 9 Panel 10 Shadow Mask 11 Fluorescent Surface 12 Lamphouse Outer Frame 13 Mercury Lamp 14, 24, 34 Light transmission slit plate 14a, 34a Slit 15 Glass plate

Claims (3)

[Claims] 1. A color picture tube exposure apparatus comprising a light transmitting slit plate having a slit orthogonal to a mercury lamp, wherein the light transmitting slit plate has a slit having a narrow central portion and a wider outer portion than the central portion. A color picture tube exposure device characterized by the above. 2. The color picture tube exposure apparatus according to claim 1, wherein the slit shape of the light transmission slit plate is a shape that expands in an arc shape from the center to the outside. 3. The color picture tube exposure apparatus according to claim 1, wherein the slit shape of the light transmission slit plate is a shape that linearly extends outward from the central portion.