JPS5952506B2 - "Kei" Exposure device for light surface formation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exposure apparatus used in the process of forming a fluorescent surface of a color picture tube.

In forming the fluorescent surface of a color picture tube, an exposure light beam is taken out from a light source placed at the position that should be the center of deflection of the tube through the correction lens system and the aperture of the shadow mask, and guided to the inner surface of the face panel. The photosensitive coating film provided on the surface is selectively exposed and baked.

The correction lens system is composed of a single or multiple optical lenses having a complex curved surface, and is located in the space between the light source and the shadow mask, so that the light ray passing through this space is directed in a direction approximating the scanning electron beam trajectory. direct to.

Also, ΔP correction and ΔS correction are performed together.

That is, as shown in FIG. 1, the deflection center 3 of the electron beam 2 emitted from the electron gun 1 moves forward by ΔP toward the fluorescent surface 4 as the beam deflection angle increases. ΔP correction is required to move the apparent upper position to follow the forward movement.

On the other hand, when dynamic convergence adjustment is performed to bring three electron beams together at an arbitrary point on the fluorescent surface 4, the deflection center moves away from the tube axis by △S as the beam deflection angle increases. Moving.

The ΔS correction is an optical correction for moving the exposure optical path to follow the change in the electron beam path accompanying this ΔS movement, and the apparent position of the upper light source is moved by ΔS as the beam deflection angle increases.

However, even if the fluorescent surface is formed by performing such △P correction or △S correction, when it is incorporated into a color picture tube and operated, the electron beam incident on the phosphor dots will be affected by the phosphor. The light body dots tend to be misaligned in the directions indicated by arrows in FIG. 2 or 3.

This type of misalignment is mainly caused by misalignment of the shadow mask during the heating process during the manufacturing of color picture tubes, especially during the sealing and exhaust processes, and the direction and magnitude of the misalignment are as follows: There is almost no difference between the same varieties.

Therefore, the phosphor dots may be formed in accordance with the positional deviation.

In the known exposure apparatus shown in FIGS. 4 and 5, a slit plate 6 is provided above an ultra-high pressure mercury lamp 5, and light emitted from the lamp 5 is directed through a slit 7 of the slit plate 6, a correction lens system 8, and a shadow. Since the light is extracted through the aperture of the mask, a point light source with high light efficiency can be obtained without requiring a conical colt.

In this case, the slit plate 6 is arranged so that the longitudinal direction of the slit 7 is parallel to the horizontal axis x-x' of the face panel 9, and the lamp 5 is arranged so that the longitudinal direction of the elongated discharge light emitting part 10 is parallel to the face panel 9. 9, parallel to the vertical axis Y-Y'.

Therefore, the light emitting point of the lamp 5 when viewed from the bottom side of the correction lens system 8 is the point a of the discharge light emitting section 10.

It will exist on the straight line connecting b and c.

This means that the point light source position is not one point but moves according to the exposure area, but since it is limited to movement in the vertical axis Y-Y' direction, it is described in Japanese Patent Publication No. 47-5668. This can be substantially corrected by using a cylindrical surface correction lens.

By the way, according to the exposure apparatus of the present invention, the phosphor driver I- is formed at a position that matches the emission point of the electron beam by utilizing the above-mentioned movement of the light emission point of the exposure apparatus. An example is shown in FIG.

As is clear from FIG. 6, the slit plate 6 covering the ultra-high pressure mercury lamp 5 is arranged so that the longitudinal direction of the slit 7 is parallel to the horizontal axis X-X' of the face panel 4. , the ultra-high-pressure mercury lamp 5 has an elongated discharge light emitting section 10 inclined clockwise at a rotation angle θ (an acute angle) with respect to the vertical axis y-y' of the face panel 4 on an axis 1-1'.
is arranged parallel to.

Therefore, the light emitting point of the lamp 5 when viewed from the lower surface side of the correction lens system 8, especially from the periphery, moves clockwise compared to the case where the inclination of the rotation angle θ is not provided, and the The impact point of the exposure light beam that enters through the shadow mask, especially the peripheral part of the photosensitive film attached to the inner surface,
Therefore, the exposure point moves in the direction shown by the arrow in FIG. 7, and the positional shift that would occur if the electron beam projection point moved in the direction shown by the arrow in FIG. 2 is eliminated.

The amount of movement of the exposure point depends on the magnitude of the rotation angle θ.

In addition, when forming the fluorescent surface of a color picture tube of the type in which the emission point of the electron beam is shifted in the direction shown by the arrow in Fig. 3, the rotation angle θ is shifted counterclockwise from the vertical axis Y-Y'. Just take it.

The present inventor uses an ultra-high pressure mercury lamp 5 as the slit plate 6.
A semi-cylindrical piece with a radius of curvature of 5 mm centered on the discharge light emitting part 10 was used (q = 5 mm), the rotation angle θ was set to 5.2 degrees clockwise, and a 20-inch, 90-degree deflection, in-line. By forming the fluorescent surface of a color picture tube, we were able to almost completely eliminate the beam projection point shift of about 14 μm in the direction of the arrow in Figure 2, which conventionally occurred around the periphery of the fluorescent surface. .

As described above, the present invention uses an ultra-high-pressure mercury lamp and a slit plate covering the lamp, and in an exposure apparatus in which the slit of the slit plate intersects with the discharge light emitting part of the lamp, the substantial light emission point is as described above. This was done with a focus on the movement of the lamp, and by simply modifying the direction of the lamp by adding a rotation angle θ, it is possible to reduce the cost and eliminate the deviation of the beam projection point due to the positional deviation of the shadow mask, etc. It can be resolved.

[Brief explanation of drawings]

Figure 1 is a diagram to explain the relationship between the deflection angle and the center of deflection of the electron beam of the color picture tube, and Figures 2 and 3 show the position of the shadow mask due to the positioning of the color picture tube during the sealing and evacuation processes. FIG. 4 is a side sectional view of a conventional exposure apparatus, FIG. 5 is a perspective view of the main parts of the same apparatus, and FIG. FIG. 7 is a plan view of the exposure apparatus that was used, and is a plan view showing the amount of correction of the fluorescent surface formed by the same apparatus. 5... Ultra-high pressure mercury lamp, 6... Slit plate, 7...
...Slit, 8...Correction lens system, 9...Face panel, 10...Discharge light emitting section.

Claims (1)

[Claims] 1. The exposure light beam taken out from the elongated discharge light emitting part of the ultra-high pressure mercury lamp through the slit of the slit plate covering the lamp, the correction lens system, and the aperture of the shadow mask is guided to the inner surface of the face panel, and the exposure light beam is guided to the inner surface of the face panel, An apparatus for exposing and printing a transparent film, the longitudinal direction of the slit being parallel to the horizontal axis of the face panel, and the longitudinal direction of the discharge light emitting part being an axis inclined at a rotation angle θ from the vertical axis of the face panel. An exposure device for forming a fluorescent surface, characterized in that the exposure device is parallel to the .