JPS598937B2 - Illuminance control method in color cathode ray tube exposure equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illuminance control method in an exposure apparatus that manufactures a black matrix film or the like on a fluorescent surface of a color cathode ray tube by a light exposure method.

When applying three types of phosphors to the inside of the panel 1 shown in FIG. A matrix is set by exposing to light through a phosphor and developing it, but in a step before coating the phosphor, a photosensitive resin is applied to the phosphor coated surface A, and after being exposed to light by an exposure device, the resin is When the developing conditions are kept constant, it is necessary to control the illuminance of the cross-exposure amount (illuminance x time) to be constant.

In the conventional method, a light receiving element 4 is provided in a lamp house 3 as shown in FIG. A method has been proposed in which the intensity of light from the mercury lamp 5 is made constant by controlling the input voltage.

However, the problem in this case is that although the input to the mercury lamp 5 can be controlled by the light receiving element 4, there is dimming due to deterioration in the performance of the mercury lamp 50, dirt on the window glass of the lamp house 3, correction lens 6, and the surface of the correction filter 70. Due to a decrease in light transmittance due to dirt and dirt on the light receiving element 4, the illuminance reaching the panel 1 cannot be kept constant for a long time.

Therefore, it was necessary to frequently measure the illuminance using an illuminance meter at a predetermined position on the panel 1, and to change the reference voltage so that the illuminance remained constant.

The present invention eliminates the conventional work of frequently measuring illuminance and manually adjusting the reference voltage, and
The device automatically controls the input to the mercury lamp 5 in order to maintain the illuminance at a predetermined position on the exposure surface A at a constant value. The light receiving element 9 installed on the stand 8 is used to keep the illuminance constant at the position of the direct exposure surface of the panel 1, thereby achieving highly accurate exposure.

This will be explained in detail below using examples.

On the exposure table 8 shown in FIG. 2a, move the light receiving element 9, which has been calibrated with another master illumination meter (not shown), to the position B before placing the panel 1, and output the output of this light receiving element 9. Input the value to the power supply circuit so that it matches the instruction value of the appropriate exposure amount for the position of the fluorescent surface, control the output value to be constant, and memorize the output of the light receiving element 4 at this point. As shown in FIG. 2b, the panel 1 is actually exposed on the exposure table 8.
When the light-receiving element 9 is placed on the light-receiving element 4, the light-receiving element 9 jumps upward, and the input to the mercury lamp 5 is adjusted to the output value stored in the light-receiving element 4 when the light-receiving element 4 enters the exposure state, thereby controlling the input to the mercury lamp 5. This reproduces the appropriate illuminance on the A side of the panel 1.

By using the above method, the illuminance at the panel position when the panel is not placed can be directly controlled at the position where the panel is installed, and at the time of exposure with the panel placed, the illuminance is automatically controlled by the light receiving element at the lamp house position. , unmanned management can be realized, and highly accurate exposure can be performed.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional exposure apparatus, and FIG. 2a is a schematic diagram showing a conventional exposure apparatus.
FIG. 2b is a diagram showing how the light receiving element is moved to the position of the exposure surface according to the present invention, and FIG. 2b is a diagram showing how the light receiving element changes its position when the panel is placed. 1... Panel, 2... Shadow mask, 3... Lamp, 4... Light receiving element, 5... Mercury lamp, 6... Correction lens, 7... Correction filter, 8... Exposure stage, 9... Light receiving element.

Claims (1)

[Claims] 1. In a color cathode ray tube exposure device, the illuminance of the exposed surface is detected by a light receiving element installed at the position of direct exposure,
A color cathode ray tube characterized in that the input power applied to the light source is automatically controlled so that the input to another light receiving element provided on the light source side is constant so as to obtain a predetermined illuminance, and the exposure illuminance on the exposure surface is stabilized. illuminance control method for exposure equipment.