JPH0664991B2 - Exposure device for creating fluorescent screen of color cathode ray tube - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an exposure apparatus for forming a three-color fluorescent screen pattern on the inner surface of a face panel of a color cathode ray tube, and particularly to a straight tube type as a light source of the exposure apparatus. The present invention relates to an exposure apparatus that uses a linear light source such as an ultra-high pressure mercury lamp.

[Prior Art] FIG. 7 is a schematic front view showing a conventional exposure apparatus for forming a fluorescent screen of a color cathode ray tube.

In the figure, (1) is a support frame, and a plurality of support bases (2a), (2b), (2c), which are vertically spaced at predetermined intervals,
(2d) and (2e) are provided. Reference numeral (4) is an exposure apparatus, and in its case (4a), a linear light source (5) such as a straight tube type ultra-high pressure mercury lamp, and radiation of a light beam (6) emitted from this linear light source (5). A light plate (7) having a regulation window (7a) for regulating the angle is housed. The linear light source (5) is adjustably attached to the lowermost support base (2a) in order to make a trajectory of light rays corresponding to each color of the three-color phosphor. Reference numeral (8) is a light quantity correction filter, which is attached to the support base (2b) and is used for the linear light source (5).
The light amount of the light beam (6) emitted from is corrected. (9),
Reference numeral (10) is a pair of optical deflection correction lenses having asymmetrical aspherical surfaces with complicated curved surfaces for matching the trajectory of the light beam (6) emitted from the line light source (5) with the optical path at the time of exposure. ,
It is adjustably attached to the supports (2c) and (2d).

Reference numeral (11) is a face panel of the color cathode ray tube, and the face panel (11) is attached to the support table (2e) substantially in the center thereof with its inner surface facing downward. (12) is a photosensitive film formed on the inner surface of the face panel (11), which is obtained by applying a slurry in which a phosphor is dispersed in a photosensitive resin and then drying the slurry. Reference numeral (13) is a shadow mask having a mask hole (13a), which is detachably attached to the face panel (11) at a predetermined distance from the photosensitive film (12).

Further, the regular window (7a) of the shiny light plate (7) is as shown in the enlarged plan view of the exposure apparatus (4) in FIG. 8 and the enlarged sectional view of the exposure apparatus (4) in FIG. The width (L ₁ ) of the regulation window (7a) in the longitudinal direction of the linear light source (5) is formed smaller than the dimension (D) of the light emitting portion in the direction orthogonal to the longitudinal direction of the linear light source (5). In addition, in FIG. 8 and FIG.
(3) is cooling water for cooling the linear light source (5) of the exposure device (4), and (4b) is a transparent plate.

As described above, the width (L ₁ ) of the regulation window (7a) in the longitudinal direction of the line light source (5) is made smaller than the dimension (D) of the light source in the direction orthogonal to the longitudinal direction of the line light source (5). The reason is
As shown in the drawing for explaining the exposure operation, when a straight tube type ultra-high pressure mercury lamp is used as the light source of the exposure apparatus for creating the fluorescent screen of the color cathode ray tube, since this is a line light source, the line light source (5 ), The light beam (6) emitted from the mask is passed through the light quantity correction filter (8) and the light deflection correction lenses (9) and (10) from each mask hole (13a) of the shadow mask (13) to the face panel (11). When the photosensitive film (12) is exposed in spots over the entire surface, the exposed shape of the photosensitive film (12) exposed through one mask hole (13a) of the shadow mask (13) is:
The larger the width (L ₁ ) of the regulation window (7a), the more the line light source (5)
An elliptical exposure (14) with a long radius in the longitudinal direction of the screen is performed, and the fluorescent points of the three colors formed on the photosensitive film (12) of the face panel (11) are too close to each other or too far apart from each other to produce accurate fluorescence. This is because the surface cannot be created, so-called mislanding such as color unevenness, color misregistration, and color mixing occurs and the quality of the color cathode ray tube deteriorates.

[Problems to be Solved by the Invention] In the conventional exposure apparatus for creating a fluorescent screen of a color cathode ray tube, the shining plate (7) is a photosensitive film (1) of a face panel (11).
In order to prevent mislanding from occurring because the exposure shape exposed to 2) becomes an elliptical shape having a long radius in the longitudinal direction of the linear light source (5), a regulation window particularly in the longitudinal direction of the linear light source (5). Since the width (L ₁ ) of (7a) is made small,
The opening area of the regulation window (7a) is small, and the light amount of the light beam (6) emitted from the linear light source (5) is small, so that the photosensitive film (12) of the face panel (11) is exposed. There is a problem that the time becomes longer and the operating rate of the exposure apparatus decreases.

The present invention has been made to solve the above problems, and it is possible to shorten the exposure time and improve the operating rate, and correct the elliptical exposure by the line light source itself to form a predetermined fluorescent screen pattern. It is an object of the present invention to provide an exposure apparatus for producing a fluorescent screen of a color cathode ray tube which can be produced accurately.

[Means for solving problems]

The exposure apparatus for creating a fluorescent screen of the color cathode ray tube according to the present invention, the line light source, with the width of the restriction window in the longitudinal direction of the line light source larger than the size of the light emitting portion in the direction orthogonal to the longitudinal direction, Support to move simultaneously in X and Y directions,
The linear light source is characterized by being provided with a drive device for performing an elliptic movement having a long radius in a direction orthogonal to the longitudinal direction.

[Action]

According to the present invention, the width of the regulation window in the longitudinal direction of the linear light source is increased and the opening area of the regulation window is increased, so that the exposure time of the photosensitive film of the face panel is shortened. Also,
By exposing the line light source to an elliptical motion having a long radius in a direction orthogonal to the longitudinal direction of the line panel, the exposure to the photosensitive film of the face panel is the elliptical motion of the line light source itself. Therefore, a predetermined exposure operation is performed in a state where the exposure shape is corrected to a circular exposure shape close to a perfect circle.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic front view showing an exposure apparatus for producing a fluorescent screen of a color cathode ray tube according to an embodiment of the present invention. In FIG. 1, the same or corresponding portions as those of the conventional one shown in FIG. The same reference numerals are given and detailed description thereof is omitted.

In FIG. 1, (15) is a drive device for causing the exposure device (4) to make an elliptical motion, (16) is a drive motor, and the drive device is provided via a reduction gear device (17) and an output shaft (17a) thereof. Drive (15).

FIG. 2 is an enlarged front view of the drive unit (15), and FIG. 3 is an enlarged front view of the drive unit (15) in which a main part is shown in a cross section. In the figure, (18a) and (18b) are a pair. Y-axis guide bar of 2 sets of columns (19a), (19b) and (20a), (20
b) parallel to each other with a predetermined gap (2
a) Mounted on top. (21a) and (21b) are a pair of support sliders, which are the above Y-axis guiders (18a) and (18b).
Are slidably supported in the Y-axis direction.
(22a) and (22b) are a pair of X-axis guide bars, which are parallel to each other and are spaced apart by a predetermined distance.
1b) is attached to it, and the case (4a) of the exposure apparatus (4) is slidably supported on the X-axis guide bars (22a) and (22b) in the X-axis direction. There is.

Next, (23) is a drive plate, and an elliptical annular groove (24) having a predetermined depth is formed on the bottom surface thereof, and is integrally attached to the center of the bottom surface of the case (4a) of the exposure apparatus (4). Has been. (25) is a crank arm, which is integrally attached to the upper end of the output shaft (17a) of the reduction gear device (17). Reference numeral (26) is a driver, which is a pin (27) implanted at the free end of the crank arm (25) and a roller (29) attached to the pin (27) via a ball bearing (28). ) Is formed by.

In addition, the regulation window (7b) of the shiya plate (7) according to the present invention
Is an enlarged plan view of the exposure apparatus (4) shown in FIG.
As shown in the enlarged cross-sectional view of the exposure apparatus (4) in the figure, the regulation window (in the longitudinal direction of the line light source (5) is larger than the dimension (D) of the light emitting portion in the direction orthogonal to the longitudinal direction of the line light source (5). The width (L ₂ ) of 7b) is increased to increase the opening area of the regulation window (7b), and the exposure time of the photosensitive film (12) of the face panel (11) is shortened.

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

FIG. 1 shows a state before the exposure work by the exposure apparatus with the face panel (11) of the color cathode ray tube set on the support base (2e).

Now, start the drive motor (16) and reduce the gear unit (17).
When the crank arm (25) is rotated via the output shaft (17a) and the drive shaft (2) of the crank arm (25).
Since 6) moves while sliding in the elliptical environment groove (24) of the drive plate (23), the exposure device (4) integrated with the driver (26) is provided with an X-axis guide bar (22a). , (22b) in the axial direction and the Y-axis guide bars (18a), (18b) in the axial direction, the rotation is blocked by each of these guide bars. The linear light source (5) makes an elliptical motion while drawing the same elliptical locus as the elliptical shape of the elliptical annular groove (24) without rotating, and the photosensitive film (12) of the face panel (11) is exposed to a predetermined exposure. Take action.

By the exposure operation described above, the exposure of the photosensitive film (12) of the face panel (11) is performed by the elliptical exposure (1) by the line light source (5) itself as shown in the exposure operation explanatory diagram of FIG.
4) is overlapped by the elliptic movement (29) of the linear light source (5), and as a result, the predetermined exposure operation is completed in a state where the circular exposure (30) is corrected to a nearly perfect circle, and the output shaft (17a) The rotation stops.

EFFECTS OF THE INVENTION As described above, according to the present invention, the width in the longitudinal direction of the linear light source of the regulation window provided on the light shielding plate is increased so as to regulate the emission angle of the light beam emitted from the linear light source. This makes it possible to increase the opening area of the regulation window and the amount of light passing therethrough in proportion to shortening the exposure time to the photosensitive film of the face panel as much as possible and improving the operating rate of the exposure apparatus. In addition, by forcibly making the line light source move in an elliptical manner, the elliptical exposure on the line light source itself is overlapped by the elliptical movement of the line light source, and the radiation range by the line light source is widened in the longitudinal direction as described above. Even if you do
The exposure of the photosensitive film of the face panel can be corrected to a circular exposure shape that is close to a perfect circle. As a result, it is possible to accurately create a fluorescent screen pattern formed of a large number of fluorescent points of three colors so that the fluorescent points do not come too close to each other or too far away from each other. It is possible to obtain a high-quality color cathode ray tube that does not cause color misregistration and color mixing.

[Brief description of drawings]

FIG. 1 is a schematic front view of an exposure apparatus for producing 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 a driving apparatus, and FIG. 3 is a sectional view of a main portion of the driving apparatus. FIG. 4 is an enlarged front view showing the exposure apparatus, FIG. 4 is an enlarged plan view of the exposure apparatus, FIG. 5 is an enlarged sectional view of the exposure apparatus, FIG. 6 is an explanatory view of an exposure operation by the exposure apparatus of the present invention, and FIG. FIG. 8 is an enlarged plan view of the exposure apparatus, FIG. 9 is an enlarged sectional view of the exposure apparatus, and FIG. 10 is an explanatory view of an exposure operation by the conventional exposure apparatus. . (4) ... exposure device, (5) ... line light source, (6) ... light beam, (7) ... shiya plate, (7b) ... restriction window, (8) ...
… Light quantity correction filter, (9), (10) …… Light deflection correction lens, (11) …… Face panel, (12) …… Photosensitive film,
(13) …… Shadow mask, (13a) …… Mask hole, (1
5) …… Drive device, (23) …… Drive plate, (24) …… Elliptical annular groove, (25) …… Crank arm, (26) …… Drive element. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A line light source that forms a fluorescent screen pattern on a photosensitive film of a face panel through a light amount correction filter, a light deflection correction lens, and a mask hole of a shadow mask, and an emission angle of a light beam emitted from this line light source. In the exposure apparatus for creating a fluorescent screen of a color cathode ray tube, which comprises a light shielding plate having a regular window, the linear light source is regulated in the longitudinal direction of the linear light source rather than the dimension of the light emitting portion in the direction orthogonal to the longitudinal direction. While increasing the width of the window and supporting it so that it can move simultaneously in the X and Y directions, we have provided a drive device that makes this linear light source perform an elliptical motion with a long radius in the direction orthogonal to its longitudinal direction. An exposure device for creating a fluorescent screen of a characteristic color cathode ray tube. 2. An exposure apparatus for producing a fluorescent 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. The drive device has a driver element provided at a free end portion of a crank arm, and an elliptical annular groove into which the driver element is slidably fitted, and the rotation of the crank arm is controlled by the linear light source. On the other hand, the exposure apparatus for producing the fluorescent screen of the color cathode ray tube according to claim 1, which is composed of a drive plate for converting into an elliptic motion.