MXPA97002084A - Exposure device for forming a panel fluorescence-free absorbent film catatume rays - Google Patents

Abstract

An exposure device for photoprotective layer film is described for forming a fluorescence-free absorbent film of a cathode ray tube (CRT) panel, having a base, a rotating support having a plurality of holes spaced at predetermined intervals in a circumferential direction and rotatably installed on the base and means projecting light installed on the base, corresponding to the respective holes. The means that project light project each light in the same path as that of the electron beam to excite the red, green and blue fluorescent layers, respectively. The panel mounted on the holes of the rotating support is sequentially exposed by the light projecting means, while the rotating support is rotated intermittently by an operating portion.

Description

EXPOSURE DEVICE FOR FORMING A PANEL FLUORESCENCE ABSORBENT FILM FOR PIPE CATHODIC RAYS Background of the Invention The present invention relates to an exposure device for forming a fluorescent film of a color cathode ray tube.

(CRT) and more in particular, with an exposure device to form an absorbent film, free of fluorescence on the inner surface of a panel. In a color cathode ray tube (CRT), a fluorescent film for forming a color image includes red, blue, and green fluorescent layers formed at points or lines on the inner surface of a panel.

Each fluorescent layer selectively emits light by means of an electron beam projected onto the layer, to thereby form an image. However, in the event that the electron beam inaccurately reaches a proposed fluorescent layer and hits an adjacent fluorescent layer and the fluorescent layer is excited and emits light, color interference is generated between the pixels and the contrast of the image is diminished. To solve the above problem, a method has been suggested, in which the emission of light from an adjacent fluorescent layer due to an electron beam deviating from a proposed fluorescent layer is prevented by the formation of a fluorescence-free absorbent film. , that is, a black matrix between the fluorescent layers.

REF: 24364 To form a fluorescent film having absorbent, fluorescence-free films on the inner surface of a cathode ray tube panel, the fluorescence-free absorbent films are formed in a predetermined configuration on the inner surface of a panel and then Red, blue and green fluorescent layers are formed between the fluorescence-free absorbent films. For the purpose of forming the fluorescent-free absorbent films on the inner surface of the panel, the inner surface of the panel is cleaned and dried. Then, an otoprotective layer film is coated on the dry internal surface of the panel and exposed. The exposure is carried out in such a manner that portions of the photoprotective film to form the red, blue and green fluorescent layers therein can not be separated during a subsequent development process. In addition, the light used for the exposure must have the same projection path as that of an electron beam projected onto each fluorescent layer. When the exposure is complete, the photoprotective layer film is revealed. A graphite film is coated on the surface of the photoprotective layer and dried. The dry graphite film is etched, to thereby form the fluorescence-free absorbent films in a predetermined configuration. Figure 1 illustrates an example of an exposure device for exposing a photoprotective layer film on the inner surface of a panel in order to form the fluorescence-free absorbent films. This exposure device has a case or box 11 on top of it, which includes a hole or opening 11a corresponding to the inner surface of a panel 100. A filter 13 and a corrective lens 14 are sequentially installed in the case 11. A shutter 15 and a lamp unit 16 which moves from right to left by an actuating portion (not shown) is provided under the corrective lens 14. For the exposure of a photoprotective layer film (not shown) to form the fluorescence-free absorbent films on the inner surface of the panel, when using the conventional exposure device as set forth above, the panel 100 has a frame assembly 110 of The shadow mask is positioned on top of the case or box 11 with the inner surface of the panel 100 facing the opening 11a. Then, the path of light emitted from the lamp unit 16 is adjusted to be identical to the path of an electron beam to irradiate a red fluorescent layer, by using the driver portion and the photoresist layer film is exposed as long as the unit 16 of lamp is alternately moved in a direction of the Y axis. After the corrective lens 14 is replaced, the lamp unit 16 is moved by a predetermined distance in a direction of the X axis when using the actuator portion. Then, the path of the light projected from the lamp unit 16 is adjusted to be identical to that of an electron beam to irradiate a green fluorescent layer and the photoprotective layer film is exposed while the lamp unit 16 is made move in the direction of the Y axis. After the corrective lens is replaced, the portions of the film of the photoprotective layer forming the blue fluorescent layer therein are exposed in the same manner as described above. The conventional exposure device requires many processes to expose the respective portions of the photoprotective layer film to form each fluorescent layer therein, since the corrective lens 14 must be replaced and the path of the light emitted from the lamp unit 16 it must be adjusted to be identical with that of an electron beam to excite each fluorescent layer by moving the lamp unit 16. Accordingly, the time required to expose the fluorescent-free absorbent films becomes longer, thereby decreasing the performance of the product.

Brief description of the invention The object of the present invention is to provide a photoprotector layer film exposure device to form a fluorescence-free absorbent film on a CRT (cathode ray tube) panel, which can reduce the number of processes and the processing time. To achieve the above object, the display device of the present invention has a base and a rotatable support installed to rotate with respect to the base. The rotating support, which rotates by the drive portion installed on the base, has a plurality of holes or openings spaced at predetermined intervals in a circumferential direction and light projecting means are installed on the base corresponding to the respective openings. The mediums that project light each project light in the same path as that of the electron beam to excite the red, green and blue fluorescent layers, respectively. According to the present invention, the panels mounted on the openings of the rotary support are each exposed sequentially by the light projecting means while the rotary support is rotated intermittently by a driving portion. Accordingly, the portions of the photoprotective film to form the red, green and blue fluorescent layers therein can be exposed simultaneously, thereby reducing the number of processes and increasing the yield of the product.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects and advantages of the present invention will become more apparent when describing in detail a preferred embodiment thereof with reference to the accompanying drawings in which: Figure 1 is a sectional view of an exposure device conventional to form an absorbent film, free of fluorescence on a CRT (cathode ray tube) panel; Figure 2 is a perspective view in partial section, of a photoprotective layer exposure device for forming a fluorescence-free absorbent film on a CRT panel according to the present invention; Figure 3 is a sectional view of the exposure device shown in Figure 2; and Figure 4 is a perspective view of an adjustment portion shown in Figure 2.

DETAILED DESCRIPTION OF THE INVENTION With reference to FIGS. 2 and 3, a photoprotective layer exposure device for forming a fluorescence-free absorbent film according to one embodiment of the present invention includes a base 20, an installed operating portion 30. in the center of the base 20, a rotating support 40 having a plurality of holes or openings 41 spaced at predetermined intervals in a circumferential direction, to rotate a predetermined number of degrees by the actuator portion 30 and first, second and third means that project light 50, 60 and 70 installed on the upper surface of the base 20, corresponding to the respective holes 41, to project light of the same path as that of an electron beam to excite the red, blue and green fluorescent layers, respectively . The base 20 is disk-shaped and is installed to rotate around a support shaft 21. The base 21 is provided with a plurality of slices 22 below the base 21 around the outer portions thereof. The drive portion 30 installed in the center of the base 21 includes a stepper motor 31. The rotating holder 40 is mounted on a rotating shaft 32 of the stepper motor 31 and the size of the holes 41 formed circumferentially around the rotating holder 40 corresponds to the size of the inner surface of the panel 100. At present, at least three Adjacent holes 41 are formed of the same size. Alternatively, a pair of groups of holes, each of which has three holes of the same size, of different sizes can be sequentially arranged to expose panels of different sizes simultaneously. The first light projecting means 50 are installed on the upper surface of the base corresponding to an opening 41 and have a box or case 51 of which the upper surface is open; a filter 52, a corrective lens 53 and a shutter 54 installed sequentially from top to bottom in the box 51; a cover 55 of the lamp installed below the shutter; and an adjustment portion 56 for moving the lamp cover 55 alternately. An adjustment portion 56 for moving the cover 55 of the lamp is provided with a frame 56a supported by the case 51 and guide rails 56b installed on the upper surface of the frame 56a, as shown in Figure 4. An element of transfer 56c having the cover 55 of the lamp placed thereon, installed to slide along the guide rail 56b and includes a support 56d parallel to the guide rail 56b. This support 56d is brought into contact with a pinion 56e installed on a rotating shaft 56g of a motor 56f fixed to the frame 56a. A lamp 55a for exposing a photoprotective film is installed on the cover 55 of the lamp. The second and third means projecting light 60 and 70 are installed near the first means 50 projecting light to correspond to the holes 41. The structure of the second and third means projecting light 60 and 70 is the same as that of the first means 50 projecting light, except that the position of a lamp cover (not shown) is adjusted to project light in the path of an electron beam to excite the red, blue and green fluorescent layers, respectively. The order of arrangement of the first to third means projecting light 50, 60 and 70 can be changed as necessary. The operation of the photoprotective film film exposure device thus constituted to form a fluorescence-free film according to the present invention will be described with reference to Figures 2, 3 and 4. To expose a photoprotective film (not shown) formed on the inner surface of the panel 100, the panel 100 having the shadow mask frame assembly 110 of FIG. 1 on the upper surface of the rotating support 40 is positioned such that the inner surface of the panel 100 faces forward to the orifice 41. Then, the orifice 41 of the rotating support 40 having the panel mounted thereon is positioned above the first means 50 that project light when the stepper motor 31 installed on the base 20 is operated. The photoresist film is exposed while the cover 55 of the lamp is moved in an alternative manner to the adjusting portion 56. The movement Alternatively, the cover 55 of the lamp by the adjusting portion 56 is carried out by rotating the pinion 56e by actuating the motor 56f and reciprocating the transfer member 56c having the support 56d coupled to it. pinion 56e along the guide rail 56b. Here, the light emitted from the first light-projecting means 50 has the same trajectory as that of an electron beam to excite a red fluorescent layer. When the exposure is complete, the panel 100 exposed by the first light projecting means 50 is exposed after it is sequentially moved to the second and third light projecting means 60 and 70 by rotating the rotary support 40 by means of the actuator portion 30. Here, second and third light projecting means 60 and 70 are set to project light in the same path as that of the electron beams to excite the green and blue fluorescent layers, respectively. As described above, according to the photoprotective layer film exposure device of the present invention, since the portions of the photoprotective layer film to form the red, blue and green fluorescent layers thereof, are sequentially exposed by the first, second and third means that project light, respectively, the number of processes can be significantly reduced in relation to the conventional individual exposure device. In addition, the processing time is also markedly reduced, thereby increasing the performance of the product to form a fluorescence-free absorbent film. To provide an evident description of the photoprotective layer film exposure device to form a fluorescent-free absorbent film of a fluorescent film according to the present invention, the exposure of the portions of a photoprotective layer film to place red fluorescent layers, blue and green in it, while successively rotating the rotating support has been described as a mode. However, the modality is an exemplary application only. Thus, the present embodiment is not limited to the above embodiment and it is clearly understood that many variations are possible within the scope and spirit of the present invention for those skilled in the art.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention is the conventional one for the manufacture of the objects to which it refers.

Having described the invention as above, property is claimed as contained in the following

Claims (3)

Claims

1. A photoprotective layer film exposure device for forming an absorbent, fluorescence-free film of a cathode ray tube panel, characterized in that it comprises: a base; an actuator portion installed in the center of the base; a rotating support having a plurality of openings or holes spaced at predetermined intervals in a circumferential direction and which is rotated by actuating the actuator portion; and means projecting light installed on the base, corresponding to the respective holes, to project light in the same path as that of the electron beam to excite the fluorescent layers red, green and blue, respectively.

2. The exposure device for photoprotective film, according to claim 1, characterized in that the means projecting light comprise: a box or case of which the upper surface is open; a filter, corrective lens and a shutter arranged sequentially from top to bottom in the case; a lamp cover installed under the shutter; and adjusting means for alternately moving the lamp cover.

3. The exposure device for photoprotective layer film according to claim 2, characterized in that the adjustment means comprise: a frame fixed to the case; guide rails installed on the frame; a transfer member having the cover of the lamp fixed thereto and including a support formed parallel to the guide rails, to move alternately along the guide rail; and a motor installed on the frame that has a fixed pinion to a motor shaft to contact the support.