JP2659938B2 - Exposure equipment for fluorescent screen formation of color picture tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a method of manufacturing a panel using a shadow mask having slot-shaped through holes arranged linearly via a bridge. The present invention relates to an exposure apparatus for forming a phosphor screen of a color picture tube which forms a phosphor stripe or the like.

(Prior art) The phosphor layer constituting the phosphor screen of a color picture tube is coated with a phosphor slurry using a sensitized tourist resin on the inner surface of the panel, dried and then exposed through a shadow mask. Then, after the photosensitive resin is exposed to light, it is formed by developing. Usually, a black material layer is formed between the phosphor layers in the same manner as the phosphor layer for improving the contrast. In the exposure, a shadow mask in which slot-shaped through-holes are linearly arranged via a bridge is used, and a phosphor and a black color are formed on the inner surface of the panel corresponding to the arrangement of the slot-shaped through-holes in the shadow mask. When a phosphor screen composed of a stripe layer of a substance is formed, a linear long light source elongated in the longitudinal direction of the slot-shaped through hole is usually used as a light source. However, when such a long light source is used, as shown in FIG. 3, a shadow mask (8) in which slot-shaped through holes (10) are arranged via bridges (11).
When the light is irradiated by using a light source (3) elongated in the longitudinal direction of the slot-shaped through-hole (10), the through-hole (10) and the bridge (1) are formed on the inner surface of the panel (5).
Since a part having a different irradiation amount is formed corresponding to 1), the fourth
The stripe (2) formed as shown in FIG. In order to correct this constriction, it is necessary to make the irradiation amount uniform, but this is because the long light source (3)
The length l may be set as follows.

Here, Lo is the distance from the long light source (3) to the inner surface of the panel (5), q is the distance from the shadow mask (8) to the inner surface of the panel (5), and P is the longitudinal direction of the slot-shaped through hole (10). The pitch is along. By the way, Lo / q is not constant over the entire screen. Normally, Lo / q becomes larger at the periphery in the direction along the longitudinal direction of the long light source (3) from the center of the screen, and becomes smaller at the periphery in the direction perpendicular to the longitudinal direction. Of these, in the direction perpendicular to the longitudinal direction of the long light source (3), the shape of the light source cover of the long light source (3) is changed to match the optimum light source length, and the constriction of the stripe (2) is corrected. ing. That is, the constriction of the stripe (2) can be corrected near the horizontal axis, but the constriction occurs in the direction along the longitudinal direction as the distance from the horizontal axis increases,
The screen quality of the color picture tube is degraded.

(Problems to be Solved by the Invention) Normally, in order to optimize the interval between the stripes (2) and form a linear stripe (2), as shown in FIGS. In addition, a shutter (20) is provided so as to partially expose in a direction along the longitudinal direction of the long light source (3), and by moving the shutter (20), an area (21) to be partially exposed is formed. In many cases, the entire inner surface of the panel (5) is exposed by reciprocating in the longitudinal direction of the long light source (3). In this case, in order to correct the constriction of the stripe (2), the light source cover (22) is moved so as to change the substantial light source length in accordance with the partial exposure area (21). There is also a method of increasing the light source length with respect to the part. But in this case,
When the light source length is slightly changed, the constriction of the stripe immediately deteriorates, and the adjustment is delicate and there are disadvantages such as difficulty in handling.

The present invention solves the above-described drawbacks, and when a panel inner surface is partially exposed, a fluorescent screen forming exposure apparatus for a color picture tube that can obtain a good screen without constriction of stripes over the entire panel. The purpose is to provide.

[Configuration of the invention]

(Means for Solving the Problems) The present invention has been made in order to solve the above problems, and has a panel mounting plate for positioning and supporting a panel in which a slot type shadow mask is incorporated, and a panel mounting plate. A long light source opposed to the panel to be fixed and arranged so that the longitudinal direction of the slot-shaped through hole of the shadow mask coincides with the long axis thereof, and a correction for correcting the trajectory of light emitted from the long light source A lens, a filter for correcting the light distribution, and an opening such that light emitted from the long light source is locally applied to an arbitrary portion of the panel inner surface, and in a longitudinal direction of the slot-shaped through-hole. A shutter reciprocating along the shutter, and while continuously irradiating the inner surface of the panel with light through the opening of the shutter, the panel is moved along the longitudinal direction of the long light source, and the shutter reciprocates. A driving unit for making one or more reciprocations faster than the moving speed of the movement, and a phosphor screen forming exposure apparatus for a color picture tube having a slot type shadow mask, wherein a stripe layer is formed on the inner surface of the panel. is there.

(Effect) While continuously irradiating an arbitrary portion of the inner surface of the panel, the panel is reciprocated along the longitudinal direction of the linear stripe, so that the locally non-uniform light irradiation amount is obtained. The portion can be moved during exposure, and the constriction of the stripe corresponding to the case where the panel is not moved can be smoothed to obtain a good stripe without a constriction.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the overall configuration of the exposure apparatus. In this exposure apparatus, a panel mounting plate (32) is provided on an upper end surface (31) of a frame (30), and the panel mounting plate (32) has a shadow mask having a large number of slot water holes. The panel (5) to which (8) is attached is positioned and placed. Inside the frame (30), a long light source (3), a landing correction lens (6), a light distribution correction filter (7), a shutter (20), and the like are sequentially arranged toward the panel (5). It is placed and arranged on. Of these configurations, the structures and operations of the landing correction lens (6) and the light distribution correction filter (7) are known, and detailed description thereof will be omitted. The long light source (3) is elongated and straight, and its longitudinal direction is the longitudinal direction of the slot-shaped through hole of the shadow mask (8) attached to the panel (5), that is, the formed linear shape. It is arranged so as to coincide with the longitudinal direction of the stripe. Here, the shutter (20) has an opening, and reciprocates in the longitudinal direction of the long light source (3) while irradiating the inner surface of the panel (5) with a rectangular area (21). Usually, about two round trips are common. Further, as shown in FIG. 2, the panel mounting plate (32) passes through the bearing portion (33) to the upper end surface (31) of the frame (30), and is driven by the driving portion (34) to form the long light source (3). It is designed to move in the longitudinal direction.
Then, during the exposure of the panel (5), the panel mounting plate (32)
Reciprocates in the longitudinal direction of the long light source (3), that is, in the longitudinal direction of the linear stripes formed on the inner surface of the panel (5) while the panel (5) is placed.

When the inner surface of the panel (5) to which the shadow mask (8) is attached is exposed using the exposure apparatus configured as described above, a good stripe without constriction can be formed.

In other words, the narrowing of the stripes occurs when the inner surface of the panel (5) is exposed, because portions of different irradiation amounts are generated due to the bridge of the shadow mask (8). But,
By moving the panel (5) in the direction in which the linear stripes are formed during exposure with the long light source, the positional relationship between the inner surface of the panel (5), the bridge of the shadow mask (8), and the light source also changes. ) Since the irradiation amount at one position on the inner surface changes with time, the irradiation amount is made uniform so that the influence of the bridge is not reduced, the constriction of the stripe is smoothed, and a stripe without a constriction is formed. . In the case of the present embodiment, the area (21) to which light is irradiated on the inner surface of the panel (5) also reciprocates in the longitudinal direction of the long light source (3) due to the reciprocating movement of the shutter (20). Are repeated during the exposure and during the exposure. Therefore, in order to smooth the constriction of the stripe, it is necessary to make the irradiation amount on the inner surface of the panel (5) uniform so as not to be affected by the bridge, so that any point on the inner surface of the panel (5) is continuously formed. During irradiation, it is necessary to move the panel (5) one or more times in the stripe forming direction.

As an example, a case in which a stripe of black material for improving contrast is formed by an exposure apparatus for a 21-inch 90 ° deflection tube will be described. Normally, in this case, even when balancing with the light source length cover to minimize the stripe constriction on the entire panel, take the half of the difference between the local maximum and minimum stripe width as the constriction amount. , About 10 to 20 μm remain. However, during exposure, the panel (5) was moved to the panel mounting plate (3).
2) When moving in the longitudinal direction of the stripe on the panel, any point on the inner surface of the panel is continuously illuminated at a moving distance of 10 mm.
Upon reciprocation, the constriction was reduced to 5 μm or less, and hardly detected.

In addition, Japanese Patent Publication No. 52-14141 discloses a method of improving the constriction by moving a long light source in the longitudinal direction of the stripe.In this case, the positional relationship between the light source and the landing correction lens is reduced. Change. On the other hand, in the present invention, since only the panel is moved, the positional relationship between the long light source (3) and the landing correction lens (6) does not change, and other characteristics are not affected.

〔The invention's effect〕

As described above, according to the present invention, it is possible to improve the constriction of the stripes formed on the inner surface of the panel in a form that can be easily adjusted without significantly changing the exposure apparatus for forming a phosphor screen.

[Brief description of the drawings]

1 and 2 are a front view and a plan view, respectively, showing the structure of an exposure apparatus for forming a fluorescent screen of a color picture tube according to an embodiment of the present invention. FIG. 5 (a) and (b) showing the constriction of the formed stripe.
1A and 1B are a side view and a plan view schematically showing a conventional phosphor screen forming exposure apparatus for taking measures against constriction of a stripe. (2) ... stripe, (3) ... long light source (5) ... panel (6) ... landing correction lens (7) ... light distribution correction filter (8) ... shadow mask, (10) ... Through-hole (11) Bridge (20) Shutter (22) Light source cover (30) Frame (31) Top end surface (32) Panel mounting plate (33) … Bearing part, (34)… Drive part

Claims (1)

(57) [Claims] 1. A panel mounting plate for positioning and supporting a panel in which a slot-type shadow mask is incorporated, and a panel facing the panel fixed to the mounting plate and facing a longitudinal direction of a slot-shaped through hole of the shadow mask. A long light source arranged so that its long axes coincide with each other, a correction lens for correcting the trajectory of light emitted from the long light source, a filter for correcting light distribution, and light emitted from the long light source. A shutter which has an opening to be irradiated locally on an arbitrary portion of the inner surface of the panel, reciprocates along the longitudinal direction of the slot-shaped through hole, and continuously illuminates the inner surface of the panel through the opening of the shutter. The panel is arranged along the longitudinal direction of the long light source, and while the arbitrary points on the inner surface of the panel are continuously illuminated, the panel is subjected to one or more reciprocating stripes. Made from the driving unit to move the on fluorescent surface forming exposure apparatus of a color picture tube having a slot type shadow mask, which comprises forming a stripe layer on the inner surface of the panel.