JPS63279538A - Exposing device for forming fluorescent screen of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent deterioration in the quality of a color cathode-ray tube caused by irregularity, deviation and mixing and the like in color by providing a driver for making a linear light source move in an elliptical form long in radial direction perpendicular to the longitudinal direction. CONSTITUTION:The elliptical exposure by a linear light source 5 of an exposing device 5 itself and the elliptical exposure by the elliptical motion of the source 5 are perpendicular to each other and overlap concentrically when the source 5 is moved in an elliptical form. The exposure for the sensitive film 12 of a face panel 11 can therefore be corrected to circular shape close to a true circle. As a result, luminescent face patterns comprising plural three-colored luminescent points can always be formed accurately. It is thus possible to prevent degrading in the quality of a color cathode-ray tube caused by irregularity, deviation, mixing end the like in color.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an exposure device that creates a three-color phosphor screen pattern on the inner surface of the face panel of a color cathode ray tube. This invention relates to an exposure apparatus that uses a line light source such as an ultra-high pressure mercury lamp.

[Prior Art] FIG. 5 is a schematic front view showing a conventional exposure apparatus for forming a phosphor screen of a color cathode ray tube.

In the same figure, (1) is a support frame, and a plurality of support stands (2a), (2b) are arranged at predetermined intervals in the vertical direction.
, (2c), (2d) and (2e) are provided. (4) is an exposure device, and inside the case (4a) there is a linear light source (5) such as a straight tube ultra-high pressure mercury lamp, and an electron beam (6) emitted from this linear light source (5). A front plate (7) having a regulation window (7a) that regulates the radiation angle
The linear light source (5) is adjustably mounted on the lowermost support stand (2a) in order to create trajectories of electron beams corresponding to the respective colors of the three-color phosphors. There is. (8) is a light amount correction filter;
b), and corrects the amount of the electron beam (6) emitted from the line light source (5). (9), (
to) is a pair of optical deflection correction lenses having an asymmetric aspherical surface with a complex curve, in order to match the trajectory of the electron beam (6) emitted from the linear light source (5) with the optical path during exposure. Adjustably attached to the support stands (2c) and (2d).

Reference numeral (11) is a face panel of a color cathode ray tube, and this face panel (11) is attached to the substantially central portion of the support base (2e) with its inner surface facing downward. (1
2) is a photosensitive film formed on the inner surface of the face panel, which is made by applying a slurry of a photosensitive resin with a phosphor dispersed therein and drying it. (13) is a shadow mask,
It is detachably attached to the face panel (11) at a predetermined distance from the photoresist film (12) of the face panel (11).

Next, an example of the use of the exposure apparatus having the above structure will be explained based on FIG. 5.

When creating a three-color mosaic phosphor screen on the inner surface of the face panel (11), first apply a photoresist film (12) of only one of the three color phosphors to the face panel (11).
Apply it to the inner surface of the mask, let it dry, and then attach the shadow mask (13) to a predetermined position.

Next, the electron beam emitted from the line light source (5), which has been moved to a position matching the trajectory of the electron beam (θ) corresponding to that color, is emitted through the mask hole (13) of the shadow mask (13).
a) Photoresist film (12) of face panel (11) through
The entire surface of the phosphor screen is exposed in a dotted manner and developed to form a phosphor screen pattern of the first color. In addition, when exposing the other two colors,
Just remove the shadow mask (13) and repeat the above operation.

[Problems to be solved by the invention] As a light source for an exposure device for creating a phosphor screen of a color cathode ray tube,
When a straight tube type ultra-high pressure mercury lamp is used, since this is a line light source, the electron beam emitted from the line light source (5)
6) from the mask hole (13a) of the shadow mask (13) to the entire surface of the photoresist film (12) of the face panel (11) via the light intensity correction filter (8) and the light deflection correction lenses (9) and (10). In the case of dot-like exposure, the exposure shape of the photoresist film (12) exposed through one mask hole (13a) of the shadow mask (13) is a line shape, as shown in the electron beam operation diagram in FIG. An elliptical exposure (10) having a long radius in the longitudinal direction of the light source (5).

Therefore, the photoresist film (12) of the face panel (11)
The large number of fluorescent dots of the three colors that are formed are either too close to each other or too far apart, making it impossible to create an accurate phosphor screen, resulting in uneven color shifts and color mixing, which degrades the quality of color cathode ray tubes. There is.

[Means for Solving the Problems] The exposure apparatus for forming a phosphor screen of a color cathode ray tube according to the present invention is provided with a drive device that moves a line light source in an elliptical motion with a long radius in a direction perpendicular to the longitudinal direction of the line light source. It is characterized by:

[Function] According to the present invention, by moving the line light source of the exposure device in an elliptical motion, the exposure of the photoresist film of the face panel can be divided into two types: elliptical exposure caused by self-curing of the line light source, and elliptical exposure caused by elliptical movement of the line light source. are perpendicular to each other and overlap concentrically, so
As a result, the exposure is corrected to a nearly perfect circle, and an accurate phosphor screen pattern is formed.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 is a schematic front view showing an exposure apparatus for forming a phosphor screen of a color cathode ray tube according to an embodiment of the present invention. In the figure, the same or equivalent parts as the conventional one shown in FIG. The same reference numerals are used, and detailed explanation thereof will be omitted.

In FIG. 1, (15) is a drive device that moves the exposure device (0) in an elliptical motion, and (1B) is a drive motor that connects the drive device ( 15).

FIG. 2 is an enlarged plan view of the drive device (15).

FIG. 3 is an enlarged front view of the drive device (15) with main parts in section, and in the same figure, (18a), (18b)
is a pair of X-axis guide bars, two sets of support columns (19a),
(19b), (20a), and (20b) are mounted on the support base (2a) parallel to each other with a predetermined interval.

(21a) and (21b) are a pair of support sliders, which are attached to the X-axis guide bars (tea) and (18b), respectively.
It is supported slidably in the axial direction. (22a), (
22b) is a pair of X-axis guide bars, which extend parallel to each other with a predetermined interval between the front support sliders (21a) and (21b).
), and the exposure equipment g! is attached to the X-axis guide bars (22a) and (22b).
1 (4) cases (4a) are supported slidably in the X-axis direction.

Next, (23) is a drive plate, and an elliptical annular groove (24) of a predetermined depth is formed on the bottom surface of the drive plate, and the above-mentioned exposure device! (4) It is integrally attached to the center of the bottom of the case (4a). A crank arm (25) is integrally attached to the upper end of the output shaft (17a) of the reduction gear device (17). (2B) is a driver.

A pin (27) implanted in the free end of the crank arm (25) and a ball bearing (
and a roller (28) attached via a roller (28).

Next, the operation of the exposure apparatus having the above configuration will be explained.

FIG. 1 shows a state in which the face panel (11) of a color cathode ray tube is set on a support stand (2e) before exposure work by an exposure device.

Now, start the drive motor (1B) and start the reduction gear device (1B).
7) and the crank arm (
25), the drive element (2B) of this crank arm (25) engages with the elliptical ring and groove (2) of the drive plate (23).
4) This drive element (26
), the exposure device (4) is integrated with the X-axis guide bar (2
2a), (22b) (F) Even though it moves in the axial direction and the axial direction of the X-axis guide bars (18a) and (18b), the exposure device is prevented from rotating by these guide bars! The linear light source (5) of t (4) moves in an elliptical manner while drawing the same elliptical locus as the elliptical shape of the elliptical annular groove (20), without rotating, and strikes the photoresist film (12) of the face panel (11). A predetermined exposure operation is performed.

By the exposure operation explained above, the face panel (11)
As shown in the explanatory diagram of electron beam operation in FIG. 4, the exposure of the photoresist film (12) in FIG. The exposure (29) overlaps each other orthogonally and concentrically, and as a result, the predetermined exposure operation is completed in a state where the exposure (30) is corrected to a nearly perfect circle, and the rotation of the output shaft (17a) is stopped. do.

[Effects of the Invention] As described above, according to the present invention, by moving the line light source of the exposure device in an elliptical motion, the elliptical exposure caused by the line light source itself and the elliptical exposure caused by the elliptical movement of the line light source are orthogonal to each other. Since the light beams overlap concentrically, the exposure of the photoresist film on the face panel can be corrected to a circular exposure shape that is close to a perfect circle.

Therefore, it is possible to always accurately create a phosphor screen pattern consisting of a large number of phosphor points in three colors, which eliminates the problems that occur in the past, such as uneven color shifts and color mixing, which degrade the quality of color cathode ray tubes. That's not true.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an exposure device for forming a phosphor screen of a color cathode ray tube according to an embodiment of the present invention, FIG. 2 is an enlarged plan view of the drive device, and FIG. 3 is a sectional view of the main parts of the drive device. FIG. 4 is an explanatory diagram of electron beam operation by the exposure apparatus of the present invention, FIG. 5 is a schematic front view of a conventional exposure apparatus for creating a phosphor screen of a color cathode ray tube, and FIG. 6 is a conventional exposure apparatus. FIG. 2 is an explanatory diagram of electron beam operation by. (4)... Exposure device, (5)... Line light source, (8)...
...Light intensity correction filter, (9), (10)...Light deflection correction lens, (11)...Face panel, (12)
... Photoresist film, (13) ... Shadow mask, (13
a)...Mask hole, (23)...Drive plate, (24)
...Oval annular groove, (25)...Crank arm. (26)...Driver, (27)...Pin, (28
)...Ball bearing, (29)...Roller. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] (1) In an exposure apparatus equipped with a linear light source that forms a fluorescent screen pattern on the photoresist film of the face panel through a light amount correction filter, a light deflection correction lens, and a mask hole of a shadow mask, the above-mentioned exposure moves in the X and Y directions. In order to cause the linear light source of the apparatus to move in an elliptical manner, a drive plate that converts the rotation of the crank arm into elliptical movement is integrally provided in the exposure apparatus, and a drive element that is slidably fitted into the elliptical annular groove of the drive plate. An exposure device for creating a phosphor screen of a color cathode ray tube, characterized in that the above-mentioned crank arm is provided with a phosphor screen. (2) The exposure apparatus for producing a phosphor screen of a color cathode ray tube according to claim 1, wherein the linear light source is a straight tube type ultra-high pressure mercury lamp. (3) Preparation of a phosphor screen for a color cathode ray tube according to claim 1, wherein the driver is a roller rotatably attached to a pin implanted in the free end of the crank arm via a ball bearing. exposure equipment.