JPH10162732A - Manufacture of exposure lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a exposure lens capable of effectively remove wax on a lens face and manufacturing a light exposure lens having a high-precision lens face. SOLUTION: In this method, a exposure lens is fixed to a die by a fixer and molded in a specified shape (drilling process S1), a light exposure lens molded by this drilling process S1 is polished (polishing process 82), the exposure lens after the drilling process S1 and the polishing process S2 is rinsed (rinsing process S3), and this rinsing process is a process for performing ultrasonic rinsing with a water solution of a releasing agent that is a main component of an anion-based critical surface activator as a rinsing liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an exposure lens used for manufacturing a fluorescent screen of a color cathode ray tube.

[0002]

2. Description of the Related Art In a cathode ray tube, an electron beam emitted from an electron gun passes through a color selection mechanism and irradiates a fluorescent screen formed on the inner surface of the panel, so that the fluorescent screen emits light and an image is displayed on the panel. Is projected.

The phosphor screen of the cathode ray tube is exposed to stripes of red, green, and blue phosphor slurries applied to the inner surface of the panel, and these are adjacent to each other across a carbon stripe formed on the inner surface of the panel. It is formed by baking on the inner surface of the panel to fit.

The formation of the fluorescent screen of the cathode ray tube is performed using an exposure apparatus. The exposure apparatus includes an ultraviolet irradiation lamp, and irradiates the object to be exposed with ultraviolet light emitted from the ultraviolet irradiation lamp through an exposure lens to perform exposure.

In order to form a fluorescent screen of a cathode ray tube, first, a color selecting mechanism having a plurality of rows of slits is attached to a panel coated with a phosphor slurry of any one of red, green, and blue on its inner surface. The panel to which the sorting mechanism is attached is set in the exposure apparatus. Then, the panel is irradiated with ultraviolet light emitted from the ultraviolet irradiation lamp through an exposure lens. At this time, since the color selection mechanism is attached to the panel, the ultraviolet light passes through the slit of the color selection mechanism and is irradiated in stripes on the inner surface of the panel. Then, the phosphor slurry applied to the inner surface of the panel is baked in a stripe shape, and a phosphor stripe of any of red, green and blue is formed.

[0006] By changing the color of the phosphor slurry applied to the inner surface of the panel and repeating the same process, phosphor stripes of three colors of red, green and blue are formed on the inner surface of the panel. When forming the phosphor stripes of the above three colors, the irradiation positions of the ultraviolet rays are shifted by changing the exposure lenses of the exposure device, and the adjacent stripes are sandwiched by the carbon stripes formed in advance on the inner surface of the panel. The phosphor stripes of three colors of red, green and blue are formed so as to match.

[0007] An exposure lens used for producing a phosphor screen is produced as follows. That is, first, glass or the like as a material is fixed to a mold having a cubic curved surface. At this time, a wax containing paraffin as a main component is used as a fixing agent. The exposure lens fixed to the mold is cut into a predetermined lens shape by a plane cutting machine. Next, the cut exposure lens is polished by a triaxial polishing machine until the surface becomes a mirror surface.

The polished exposure lens is removed from the mold, and the wax used as a fixing agent is wiped off with a rag to complete the desired exposure lens.

[0009]

However, the above wax used as a fixing agent may not be completely removed only by wiping with a rag. If wax remains on the lens surface of the exposure lens, the refractive index of the incident light changes, and proper exposure cannot be performed.

Accordingly, an object of the present invention is to provide a method of manufacturing an exposure lens capable of effectively removing wax on a lens surface and manufacturing an exposure lens having a highly accurate lens surface.

[0011]

In order to achieve the above object, a method of manufacturing an exposure lens according to the present invention includes: a cutting step of fixing an exposure lens to a mold with a fixing agent and forming the exposure lens into a predetermined shape; A polishing step of polishing the exposure lens formed by the cutting step, and a cleaning step of cleaning the exposure lens after the cutting step and the polishing step, this cleaning step,
Ultrasonic cleaning is performed using an aqueous solution of a release agent containing an anionic surfactant as a main component as a cleaning liquid.

According to this method of manufacturing an exposure lens, the fixing agent used in the cutting step and the polishing step is separated from the lens surface of the exposure lens in the cleaning step, so that the exposure lens having a highly accurate lens surface Can be produced.

[0013]

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

In the cathode ray tube, an electron beam emitted from an electron gun passes through a color selection mechanism and irradiates a fluorescent screen formed on the inner surface of the panel, so that the fluorescent screen emits light and an image is displayed on the panel. It is what is done.

The fluorescent screen of the cathode ray tube is exposed to red, green, and blue phosphor slurries applied to the inner surface of the panel in a stripe shape, and these are adjacent to each other across a carbon stripe formed on the inner surface of the panel. It is made by baking on the inner surface of the panel to fit.

The production of the fluorescent screen of the cathode ray tube is performed using, for example, an exposure apparatus 1 as shown in FIG. The exposure apparatus 1 includes a frame 3 on which a panel 2 is positioned and mounted;
An ultraviolet lamp 4 for irradiating the inner surface 2a of the panel 2 with ultraviolet light
And an exposure lens 5 for determining the irradiation position of the ultraviolet light emitted from the ultraviolet lamp 4. The exposure lens 5 includes a plurality of lenses 5a, 5b, 5c, and 5d in order to appropriately determine the irradiation position of the ultraviolet light.
Are configured in combination. In the present specification, the plurality of lenses 5a, 5b, 5c, and 5d are collectively referred to as an exposure lens 5.

In order to form a fluorescent screen using this exposure apparatus 1, first, a color selection mechanism 6 having a plurality of rows of slits 6a is mounted on the inner surface 2a side of the panel 2 having the inner surface 2a coated with a photoresist. . Then, the panel 2 to which the color selection mechanism 6 is attached is positioned and mounted on the frame 3 of the exposure apparatus 1 such that the inner surface 2a faces the ultraviolet lamp 4 side.

Then, ultraviolet rays are turned on from an ultraviolet lamp 4 to expose the photoresist applied to the inner surface 2a of the panel 2. The ultraviolet light emitted from the ultraviolet lamp 4 is
The irradiation position is determined by the exposure lens 5, and the color selection mechanism 6
Through the slit 6a, the photoresist at a predetermined position is irradiated in a stripe shape, and is baked on the inner surface 2a of the panel 2.

By changing the exposure lens 5 to shift the irradiation position of the ultraviolet rays and repeating the same process three times, a photoresist stripe is formed at a position where a phosphor stripe is to be formed later.

Next, a carbon slurry is uniformly applied to the entire inner surface 2a of the panel 2 on which the photoresist stripe is formed. Then, the carbon slurry is formed on the inner surface 2a of the panel 2 by reversal development of the carbon slurry.

Next, a phosphor slurry of any of red, green and blue colors is applied to the inner surface 2a of the panel 2 having the carbon stripe formed on the inner surface 2a, and a color selection mechanism is applied to the inner surface 2a side of the panel 2. 6 is attached. Then, the panel 2 to which the color selection mechanism 6 is attached is positioned and mounted on the frame 3 of the exposure apparatus 1.

Then, ultraviolet light is turned on from the ultraviolet lamp 4 to expose the phosphor slurry applied to the inner surface 2a of the panel 2 to light. The ultraviolet light emitted from the ultraviolet lamp 4 is
The irradiation position is determined by the exposure lens 5, and the color selection mechanism 6
Through the slit 6a, the phosphor slurry at a predetermined position is irradiated in a stripe shape, and is baked on the inner surface 2a of the panel 2.

The color of the phosphor slurry applied to the inner surface 2a of the panel 2 is changed, the exposure lens 5 is changed to shift the irradiation position of the ultraviolet light, and the same process is repeated three times to sandwich the photoresist stripe. Then, red, green, and blue phosphor stripes are formed adjacent to each other, and a phosphor screen is formed on the inner surface 2a of the panel 2.

As described above, the positions where the carbon stripes and the red, green, and blue phosphor stripes forming the phosphor screen are formed are determined by the exposure lens 5 of the exposure apparatus 1. Therefore, the exposure lens 5 is required to have a highly accurate lens surface.

The exposure lens 5 is manufactured through a process as shown in FIG. 2, for example. That is, first, in the exposure lens cutting step S1, glass or the like as a material is fixed to a mold having a cubic curved surface. At this time, for example, wax containing paraffin as a main component is used as the fixing agent. The exposure lens 5 fixed to the mold is roughly cut by a plane cutting machine (not shown) so as to have a predetermined lens shape.

Next, in the exposure lens polishing step S2, the cut exposure lens 5 is polished by a three-axis processing polisher (not shown) until the surface becomes a mirror surface. The polished exposure lens 5 is removed from the mold, and wax or the like used as a fixing agent is wiped off with a waste cloth.

Next, in the exposure lens cleaning step S3, the polished exposure lens 5 is ultrasonically cleaned by, for example, an ultrasonic cleaning device 7 as shown in FIG. 3 to remove the fixing agent remaining on the lens surface. You.

The ultrasonic cleaning device 7 includes an ultrasonic generator 8,
It has a vibrator 9 for converting electric vibration generated by the ultrasonic generator 8 into mechanical vibration, and a liquid tank 11 filled with a cleaning liquid 10.

As the cleaning liquid 10, an aqueous solution of a release agent containing an anionic surfactant as a main component is used. In this example, an example in which Poles Yushilon Pickmore (produced by Yushiro Chemical Industry Co., Ltd.) is used as a release agent will be described. The release agent is not limited to this, and any other release agent may be used as long as the release agent has an anionic surfactant as a main component.

The components of the release agent are as follows.

-Anionic surfactant-Alcohol solvent-Amine solvent-Water softener-Dye-Water And the properties of this release agent are as follows.

[0032] This release agent is dissolved in water at a ratio of, for example, release agent: water = 1: 15, and the cleaning liquid 10 is prepared. Note that the ratio of the release agent to water is not limited to 1:15, and can be changed as long as a fixing agent such as wax can be effectively removed. , It has been confirmed that good peeling is exhibited.

The polished exposure lens 5 is placed in a liquid tank 11 filled with a cleaning liquid 10 while being supported by an attachment 12. This ultrasonic cleaning device 7
Ultrasonic generator 8 emits an electrical vibration of about 20~100kH _Z, vibrator 9 receives the electric vibration to vibrate.
The cleaning liquid 10 filled in the liquid tank 11 rubs against the exposure lens 5 placed in the liquid tank 11 by vibrating the vibrator 9, and the fixing agent on the lens surface of the exposure lens 5 is peeled off. .

Exposure lens 5 from which the fixing agent on the lens surface has peeled off
Is taken out of the liquid tank 11 of the ultrasonic cleaning device 7 and washed with water to form the exposure lens 5 having a highly accurate lens surface.

The exposure lens 5 manufactured by this method of manufacturing an exposure lens has a highly accurate lens surface because the fixing agent such as wax is effectively removed in the exposure lens cleaning step S3. Can be appropriately refracted. Exposure lens 5 can be manufactured.

[0036]

The method of manufacturing an exposure lens according to the present invention comprises:
Since the fixing agent used in the exposure lens cutting step and the exposure lens polishing step is effectively removed in the exposure lens cleaning step, an exposure lens having a highly accurate lens surface can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an exposure apparatus.

FIG. 2 is a process explanatory view of an exposure lens manufacturing method according to the present invention.

FIG. 3 is a perspective view of the ultrasonic cleaning device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Exposure apparatus, 2 panels, 4 ultraviolet lamps, 5 exposure lenses, 7 ultrasonic cleaning apparatus, 10 cleaning liquid, S1
Exposure lens cutting process, S2 Exposure lens polishing process, S3
Exposure lens cleaning process

Claims (3)

[Claims] 1. A cutting step of fixing an exposure lens to a mold with a fixing agent and forming the exposure lens into a predetermined shape; a polishing step of polishing the exposure lens formed by the cutting step; A cleaning step of cleaning the exposure lens later, wherein the cleaning step is a step of performing ultrasonic cleaning using an aqueous solution of a release agent containing an anionic surfactant as a main component as a cleaning liquid. Method of manufacturing. 2. The method according to claim 1, wherein said fixing agent is a wax containing paraffin as a main component. 3. The method of manufacturing an exposure lens according to claim 1, wherein the cleaning liquid has a release agent and water in a ratio of 1:15.