JP2002231134A - Exposure device and exposure method for forming fluorescent face of color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exposure device and an exposure method for forming the fluorescent face of a color picture tube capable of surely improving the deterioration of a white uniformity and brightness characteristics particularly in a highly accurate color picture tube formed in flat and wide angle with a simple structure and without sacrificing a working efficiency by solving such problems that the unbalance of light beam volume distribution at the horizontal axis ends and diagonal axis ends occurs in the lateral direction when a photosensitive layer corresponding to a side beam is exposed to form the fluorescent face of the color picture tube and a uniform exposure is not performed. SOLUTION: A lamp house 16 is selectively and movably installed parallel to a face plate 13 installed in the exposure device, and ultra violet of a mercury lamp 23 forming the lamp house 16 is radiated through a slit 25 formed in a light shielding plate 26. The light shielding plate 26 is formed so as to be moved by a drive device 28 in the longitudinal direction of the mercury lamp 23 independently of the lamp house 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus and an exposure method for exposing a photosensitive layer provided on an inner surface of a face panel of a color picture tube.

[0002]

2. Description of the Related Art As shown in FIG. 5, a color picture tube generally has a face panel 51 having a substantially rectangular shape, and an envelope comprising a funnel 52 joined to the face panel 51. 51 inside, blue,
A phosphor screen 53 made of a three-color phosphor layer that emits green and red light is formed, and the face panel 51 faces the phosphor screen 53.
Inside, a shadow mask 54 in which a number of electron beam passage holes are formed is arranged.

On the other hand, an electron gun 57 for emitting three electron beams 56B, 56G, 56R is provided in the neck 55 of the funnel 52, and the electron gun 57 emits three electron beams 56B, 56G, 56R.
The electron beams 56B, 56G, and 56R are deflected by a magnetic field generated by a deflection yoke 58 mounted outside the funnel 52, and the fluorescent screen 53 is horizontally and vertically scanned by the electron beams 56B, 56G, and 56R. The color image is reproduced and displayed on the fluorescent screen 53.

As the phosphor screen 53, a black matrix or black stripe phosphor screen 53 in which a three-color phosphor layer is embedded in a gap between a matrix-shaped or striped light-absorbing layer is frequently used.

The fluorescent screen 53 of the color picture tube has been conventionally formed by a photographic printing method. For example, the black matrix type or black stripe type fluorescent screen 53 having the light absorbing layer is formed as follows.

[0006] First, after cleaning the inner surface of the face panel 51, polyvinyl alcohol (PVA) and ammonium dichromate (A)
DC) is applied and dried.

Next, the photosensitive film is formed on a shadow mask 54.
The pattern corresponding to the electron beam passage hole of the shadow mask 54 is baked on the photosensitive film and developed, and the inner surface of the face panel 51 is exposed to the shadow mask 54.
Then, a resist film to be a matrix-shaped photosensitive layer composed of a pattern corresponding to the opening pattern is formed.

Then, a light absorbing paint layer made of, for example, graphite is applied to the inner surface of the face panel 51 on which the resist film is formed, and the light absorbing paint on the resist film is peeled off together with the resist film to form a matrix. Alternatively, a stripe-shaped light absorption layer is formed.

Thereafter, a phosphor slurry layer serving as a photosensitive layer mainly containing a phosphor, PVA, ADC or the like is applied to the inner surface of the face panel 51 on which the light absorbing layer is formed and dried, and the phosphor slurry is dried. The layer is exposed through a shadow mask 54 so that a pattern corresponding to the electron beam passage holes of the shadow mask 54 is printed and then developed, and blue, green, and red are formed in predetermined gaps of the light absorbing layer. A phosphor layer corresponding to one of the three colors is formed. By repeating such a phosphor layer forming process for the remaining two color phosphors, three color phosphor screens are formed.

The three-color phosphor screen having no light absorbing layer can be formed by repeating the phosphor layer forming process for the three color phosphors.

In order to obtain such a light absorbing layer and a three-color phosphor layer, a pattern corresponding to the electron beam passage holes of the shadow mask 54 is printed on a photosensitive layer for forming a phosphor screen such as a photosensitive film or a phosphor slurry layer. Uses an exposure apparatus as shown in FIG.

That is, a support base 62 for positioning and supporting a face panel 51 on which a photosensitive layer 61 such as a photosensitive film or a phosphor slurry layer is formed on the inner surface and on which a shadow mask 54 having a function as a photomask is mounted is provided. Case 63
It is provided on the upper part of.

A lamp house 56 having a built-in ultra-high pressure mercury lamp is provided below the housing 63 with a face panel 51.
UV light radiated from the lamp house 64 sequentially from the lamp house 64 in the direction of the support 62 on the orbit of the electron beams 56B, 56G and 56R. , And an optical lens system such as a common lens 66 and 67 commonly used for each color, and a correction lens 65 arranged to individually correspond to each of the blue, green, and red colors of the phosphor, and the face panel 5.
A light amount correction filter 68 for correcting the light amount distribution with respect to the phosphor layer forming photosensitive layer 61 formed on the inner surface is provided.

The correcting lens 65 corrects the trajectory of the ultraviolet rays so that the positions of the respective phosphors coincide with the trajectories of the electron beams 56B, 56G, 56R. The lenses 65, 66, and 67 are aspherically shaped so that the surfaces of the lenses 65, 66, and 67 have fine irregularities so that the ultraviolet rays from the lamp house 64 approximate the actual electron beams 56B, 56G, and 56R.

The lamp house 64 is aligned with the longitudinal direction of the electron beam passage hole forming the slot-shaped through hole of the shadow mask 54 attached to the face panel 51, that is, the longitudinal direction of the formed linear stripe. A light-shielding plate provided with a slit, which will be described later, is disposed so that ultraviolet light is emitted through the slit.

In order to expose the photosensitive layer 61 for forming the fluorescent screen 53 of the color picture tube using the exposure apparatus having the above-described structure, the ultraviolet light radiated from the lamp house 64 is irradiated with the correction lens 65. , 66, and 67 correct the ultraviolet ray trajectory, correct the light amount distribution by the correction filter 68, and use the shadow mask 54 having a color selection function as a photomask to apply the photosensitive film applied to the inner surface of the face panel 51. Alternatively, a photosensitive layer 61 such as a photosensitive phosphor slurry layer formed by mixing a phosphor and a photosensitive binder is exposed, developed after this exposure, and developed into a stripe-shaped phosphor screen 53.
It forms a pattern.

The details of the lamp house 64 of such an exposure apparatus will be described with reference to FIGS. The lamp house 64 has a box-shaped housing 72 for accommodating an ultra-high pressure mercury lamp 71, and a through hole (not shown) is provided on each of the opposed side surfaces of the housing 72. A mercury lamp 71 is mounted inside the housing 72 so as to extend through the pair of through holes so that the horizontal direction of the face panel 51 is the longitudinal direction.

A light shielding plate 74 having a slit 73 for adjusting the amount of light is provided inside a housing 72 facing the mercury lamp 71.
Are provided so that the longitudinal direction of the slit 73 is orthogonal to the axial direction of the mercury lamp 71.
A transparent glass plate 75 is attached to the upper surface of the housing 72. The interior of the housing 72 is filled with a cooling liquid so as to circulate through the housing 72 to facilitate heat radiation of the mercury lamp 71. Is configured to be movable in the axial direction.

As shown in FIG. 9, the general illuminance distribution characteristic L of the mercury lamp 71 used here is such that the largest illuminance is obtained at the center of the arc of the mercury lamp 71, and as it goes toward both ends. The illuminance gradually decreases so as to draw a parabola.

Considering the case where the photosensitive layer 61 is exposed by the lamp house 64 using the mercury lamp 71 having the illuminance distribution characteristics L, the horizontal (long axis) direction of the face panel 51 is set to H, , One direction, for example, the right direction is +, the opposite direction is-, the vertical (short axis) direction is V, and one direction from the center thereof, for example, the upper direction is +, the opposite direction is-, and the diagonal axis direction is D. If you set
The longitudinal direction of the mercury lamp 71 is arranged parallel to the H direction,
Further, the slit 73 of the light shielding plate 74 is provided so as to be in the V direction.

Therefore, for example, when exposing a green photosensitive layer, ultraviolet rays exposing near the center C of the face panel 51 and both ends H + and H− in the H direction of the face panel 51 are viewed from the V direction of the face panel 51. This is shown in FIG.
In this figure, the illuminance distribution characteristics L shown in FIG. 9 are also synthesized and displayed, and the centers C, H +, and H of the face panel 51 are displayed.
-The actual light source position for exposing the edge is indicated by a black circle in the figure,
In addition, each ultraviolet ray is indicated by an arrow.

Accordingly, the substantial light source position with respect to the center of the face panel 51 can be considered as a portion indicated by a black circle c of the mercury lamp 71, and a light beam due to this c is emitted toward the center as indicated by C. Similarly, face panel 51
In the + direction of H, as a substantial light source, H +
In the H direction, it is considered that a light ray in the H direction is emitted at the portion b as a substantial light source. When the positions of the light sources a, b, and c are applied to the illuminance distribution characteristic L, as shown by the crosses in the figure,
a ', b', and c ', respectively, and light sources a', b, respectively.
', C'.

As can be seen from this figure, when exposing the photosensitive layer for green, the lamp house 64 is connected to the face panel 5.
Light source c that illuminates the center because it coincides with the center of 1
′, The light sources a ′ and b ′ that irradiate in the H end direction are at the same position on the left and right, respectively, so that it is understood that they are exposed with the same illuminance.

On the other hand, when the blue photosensitive layer is exposed, the lamp house 64 is shifted on the H axis to the left of the V axis of the face panel 51, and as a result, as shown in FIG. , A light source b for generating a light beam H- for exposing the H- side substantially approaches the center of the illuminance distribution characteristic L, and conversely, a light source a for generating a light beam H + for exposing the H + side.
Is a position away from the center. As a result, the exposure is performed in an unbalanced state in which the uniformity of the illuminance on the left and right sides of the face panel 51 is lost and the exposure illuminance for exposing the H- side is high, and the exposure illuminance for exposing the H + side is low. Therefore, the left and right balance of the exposure illuminance is lost due to the unevenness of the optical path length, and when the red photosensitive layer is exposed, the opposite phenomenon to the exposure of the blue photosensitive layer occurs.

In recent years, the size and width of a high-definition color picture tube have been further increased, and even in an exposure apparatus corresponding to this, when exposing the horizontal H end and the diagonal D end of the face panel 51, it is difficult to expose the face panel 51. The emission angle of the exposure light beam tends to increase, and as the emission angle increases, the above-mentioned nonuniformity of the optical path length increases, resulting in a more serious state. Accordingly, the distance from the light sources a and b and the incident angle of the light are different between the central portion and the peripheral portion of the inner surface of the face panel 51, so that a light amount difference occurs, and a uniform or desired light amount distribution is obtained in the entire photosensitive layer 61. Therefore, the formed light absorbing layer and phosphor layer are no longer of a predetermined size.

[0026]

In order to solve this problem, a light amount correction filter 68 is used. The light amount correction filter 68 is provided on one surface of a glass transparent substrate 69 such as Ni or Cr. Metal is deposited to form a metal deposited film 70
Is formed, and the film thickness of the metal deposition film 70 is changed so as to suppress the light transmittance at the central portion and to increase the light transmittance toward the peripheral portion.

However, as described above, the metal deposition film 70
It is not easy to adjust the light transmittance depending on the thickness of the film, and the reproducibility is poor. Therefore, there arises a problem that the formed light absorption layer and phosphor layer do not have a predetermined size due to a difference in light transmittance distribution.

Therefore, the light amount correction filter 68 is changed to blue, green,
It is conceivable that each red color is individually designed and manufactured, and exposure is performed while replacing each exposure.However, it is possible to correct in the direction of decreasing the light amount, but not in the direction of increasing the light amount. Due to the manufacturing variation of the correction filter 68 itself, not only does the size of the light absorbing layer and the phosphor layer formed vary, but also the degree of the variation in the light absorbing layer and the phosphor layer combined in three colors. The risk of increase increases, causing white uniformity and luminance degradation, not only stabilizing the product, but also requiring three light quantity correction filters 68 to be replaced and replaced each time. Therefore, not only the manufacturing cost is increased, but also the workability is extremely deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a fluorescent screen of a color picture tube capable of reliably performing exposure with a simple structure without preparing a light amount correction filter for each of them. An object of the present invention is to provide a forming exposure apparatus and an exposure method.

[0030]

According to the present invention, there is provided an exposure apparatus for forming a fluorescent screen on a face of a color picture tube for forming a phosphor screen on an inner face of a face panel of the color picture tube. A support base for supporting and positioning the face panel on which the shadow mask is mounted facing the layer,
A lamp house, which is disposed opposite to the support table and movably installed with a built-in light source lamp for irradiating the photosensitive layer with ultraviolet rays through a shadow mask; and a light source, which is disposed on the shadow mask side of the lamp house. A light-shielding plate having a slit through which ultraviolet light from the lamp passes, a correction lens for correcting the ultraviolet light emitted through the slit of the light-shielding plate to a predetermined trajectory, and a light-shielding plate selected for the light source lamp. And a driving device for moving the light shielding plate relative to the light source lamp.

The photosensitive layer formed on the inner surface of the face panel of the color picture tube having a shadow mask is irradiated with ultraviolet rays from a light source lamp through a slit formed in a light shielding plate and a correction lens for correcting the trajectory of the ultraviolet rays. Thus, in the exposure method for forming a fluorescent screen of a color picture tube for exposing the photosensitive layer, the position of the light source lamp is moved corresponding to the photosensitive layer, and the light shielding plate is moved independently of the light source lamp. Then, the position of ultraviolet radiation from the light source lamp was substantially changed to perform exposure.

According to the exposure apparatus and the exposure method for forming a fluorescent screen of a color picture tube according to the present invention, when the photosensitive layers for blue and red are exposed, the exposure is performed in a direction away from the V axis of the face panel. In accordance with the movement of the lamp house shifted on the H axis, while keeping the distance between the light shielding plate and the mercury lamp constant, the slit formed in the light shielding plate is relatively moved away from the arc center of the mercury lamp. The exposure is performed by changing the substantial light source position by moving independently of the movement of the lamp house, thereby reducing the left and right non-uniformity of the light amount distribution of the exposure light beam and making the photosensitive layer uniform left and right. And the uniformity of the size of the phosphor screen is ensured, and the simple configuration and the need to replace the light intensity correction filter each time make it inexpensive and excellent in workability. Phosphor surface forming an exposure apparatus and the exposure method of the color picture tube can be provided.

[0033]

Embodiments of the present invention will be described below in detail with reference to the drawings. Since the configuration of the color picture tube itself is the same as that of the related art, a detailed description thereof will be omitted.

FIG. 1 is a sectional view schematically showing an exposure apparatus having a correction lens for forming a fluorescent screen of a color picture tube.

That is, a support base 14 for positioning and supporting a face panel 13 on which a photosensitive layer 11 such as a photosensitive film or a phosphor slurry layer is formed on the inner surface and on which a shadow mask 12 having a function as a photomask is mounted is provided. Case 15
It is provided on the upper part of. A lamp house 16 having a built-in ultra-high pressure mercury lamp as a light source lamp is installed below the housing 15 so as to be selectively movable with respect to the face panel 13. A correction arranged to make the ultraviolet rays radiated from the lamp house 16 successively from the lamp house 16 in the direction of the support base 14 approximate to the trajectory of the electron beam, and to correspond to each of the blue, green and red colors of the phosphor individually. Metal deposition on the lens 17, the optical lens system such as common lenses 18 and 19 commonly used for each color, and the glass transparent substrate 20 which corrects the light amount distribution for the phosphor layer forming photosensitive layer 11 formed on the inner surface of the face panel 13. Light amount correction filter 22 having a structure in which film 21 is formed
Is installed.

The correcting lens 17 corrects the trajectory of the ultraviolet rays so that the position of each fluorescent substance coincides with the trajectory of the electron beam.
The lenses 17, 18, and 19 are aspherically shaped so that the surfaces of the lenses 17, 18, and 19 have fine irregularities so that the ultraviolet light from the lamp house 16 approximates an actual electron beam.

Inside the lamp house 16, a mercury lamp described later is installed so that its longitudinal direction coincides with the horizontal axis direction of the face panel 13, and an opening is formed on the face panel 13 side in a direction perpendicular to the longitudinal direction of the mercury lamp. A light-shielding plate is arranged so that the ultraviolet light is emitted through the slit.

The photosensitive layer 11 for forming the fluorescent screen of the color picture tube using the exposure apparatus having the above-described structure.
In order to expose the light, the ultraviolet ray radiated from the lamp house 16 is corrected for the ultraviolet ray trajectory by the correction lenses 17, 18, and 19, and then the light amount distribution is corrected by the light amount correction filter 22, so that the color selection function is performed. The photosensitive layer 11 such as a photosensitive film applied on the inner surface of the face panel 13 or a photosensitive phosphor slurry layer formed by mixing a phosphor and a photosensitive binder is exposed using the shadow mask 12 having a photomask as a photomask. After the exposure, development is performed to form a stripe-shaped phosphor screen pattern.

The lamp house 16 of such an exposure apparatus will be described in detail with reference to FIG. The lamp house 12 has a box-shaped housing 24 for accommodating an ultra-high pressure mercury lamp 23 as a light source lamp 23, and a through hole (not shown) is formed on one of the opposed side surfaces of the housing 24. A mercury lamp 23 is mounted inside the housing 24 through the pair of through holes so that the horizontal direction of the face panel 13 is the longitudinal direction.

The housing 24 faces the mercury lamp 23.
A light shielding plate 2 having a slit 25 for light quantity adjustment therein
6 is provided so that the longitudinal direction of the slit 25 is orthogonal to the axial direction of the mercury lamp 23, and the light shielding plate 26 is connected to a driving device 28 via a driving shaft 27 penetrating the housing 24. The driving device 28 is mounted so as to be movable in parallel with the tube axis direction of the mercury lamp 23 while keeping the inside of the housing 24 constant with the mercury lamp 23 by the driving device 28.

Further, a transparent glass plate 29 is attached to the upper surface of the light-shielding plate 26 on the upper side surface of the housing 24. The inside of the housing 24 is provided for facilitating heat radiation of the mercury lamp 23. The coolant is filled so as to circulate in the housing 24. The entire lamp house 16 is mounted on the housing 15 so as to be movable in the axial direction of the mercury lamp 23 with respect to the housing 15.

In the case of performing exposure using the exposure apparatus having the above-described configuration, a PV panel is provided on the inner surface of the face panel 13 constituting the color picture tube which is the object of the exposure apparatus.
A face panel 13 on which a photosensitive layer 11 such as a photosensitive film containing A and ADC as a main component is applied is placed and fixed on a support base 14, and the photosensitive layer 11 is attached to the face panel 13 using an exposure device. Exposure is performed using the attached shadow mask 12 as a photomask.

After a pattern corresponding to the electron beam passage holes of the shadow mask 12 is baked and developed, a resist film having a pattern corresponding to the opening pattern of the shadow mask 12 is formed on the inner surface of the face panel 13.
After further applying a light absorbing paint layer to the inner surface of the face panel 13 on which the resist film is formed, the light absorbing paint on the resist film is peeled off together with the resist film to form a matrix light absorbing layer. .

Thereafter, a photosensitive layer 11 such as a phosphor slurry layer mainly composed of a phosphor, PVA, ADC or the like is applied and formed on the inner surface of the face panel 13 on which the light absorbing layer is formed. Exposure is performed through the shadow mask 12, a pattern corresponding to the electron beam passage holes of the shadow mask 12 is printed and developed, and fluorescent light of any one of blue, green and red is applied to a predetermined gap of the light absorbing layer. Form a body layer.

The phosphor layer forming process is repeated for the remaining two color phosphors to form a phosphor screen having three color phosphors. In addition, for the phosphor screen having no light absorbing layer, only the phosphor forming step is performed in three steps.
It is formed by repeating for color phosphors.

In this exposure, when exposing the green photosensitive layer 11 of the center beam, the light shielding plate 2 is formed in the same manner as in the prior art.
6 are aligned with the center of the arc of the mercury lamp 23, the light source positions for the left and right H + and H- ends in the horizontal direction are equal in the left and right directions, and are exposed by light beams having substantially the same amount of light. However, when exposing the blue and red photosensitive layers 11 of the side beam, the exposure is performed as follows.

That is, when the blue photosensitive layer 11 is exposed, the lamp house 16 is shifted in the H-direction when viewed from the V-direction of the face panel 13 and the driving device 28 is driven. Move the drive shaft 27 in the horizontal direction,
The light shielding plate 26 is moved outward in the H-direction. As a result, the position of the slit 25 is also shifted in the H-direction from the arc center of the mercury lamp 23.

By this shift, as shown in FIG.
The substantial light source a of the + ray is a central side a ′ of the illuminance distribution characteristic L
Will be located at Conversely, for the H- ray, the substantial position of the light source b is located at b 'in a direction away from the center side of the illuminance distribution characteristic L, so that H +
And the substantial light sources a and b as H-rays are a 'and b' on the illuminance distribution characteristic L, and can be set equally to the left and right.

If the light shielding plate 26 is moved in conjunction with the movement of the lamp house 16, the adjustment can be automatically set, the efficiency can be improved, and the automation can be achieved. It becomes possible.

When exposing the photosensitive layer 11 for red, the light is shifted in the opposite direction to that for blue,
Similarly, it is possible to set the illuminance distribution evenly to the left and right.

When either the H + or H- ray is extremely fluctuating, the position of the light shielding plate 26 is shifted more with respect to the fluorescent lamp 23 so that the fluorescent lamp 23 and the slit 25 Can be largely changed, for example, as shown in FIG. 4, it is also possible to increase the exposure illuminance on the H + ray side and relatively reduce the exposure illuminance on the H− ray side. It is possible to more precisely adjust the difference in the left and right distribution of the exposure illuminance due to the optical path length.

The present invention is not limited to the above-described embodiment. For example, in order to drive a light-shielding plate, it is described that a driving shaft is moved left and right from a driving device to shift the light-shielding plate. However, this drive device is configured as a drive source such as a motor that performs a rotary motion, and a rack that transmits the rotary motion by a drive shaft and converts the rotary drive into a reciprocating motion is provided on the light shielding plate side. A driving method using a rack and a pinion can be adopted, and it goes without saying that various other applications and modifications are possible.

[0053]

According to the present invention, it is possible to reduce the non-uniformity of the exposure light amount distribution on the inner surface of the face panel caused by the shift of the lamp house with respect to the photosensitive layer. It is suitable to be used for forming a fluorescent screen of a high-definition color picture tube, and it is possible to provide an inexpensive exposure apparatus and an exposure method which are inexpensive and excellent in workability. It is possible to manufacture a color picture tube having good quality and brightness characteristics.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view for explaining an exposure apparatus for forming a fluorescent screen of a color picture tube according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a lamp house included in the exposure apparatus according to the present invention.

FIG. 3 is an explanatory diagram for explaining illuminance distribution by a lamp house.

FIG. 4 is an explanatory diagram for explaining another example of the illuminance distribution by the lamp house.

FIG. 5 is a partially cutaway side view showing the configuration of a conventional color picture tube.

FIG. 6 is a sectional view showing a conventional exposure apparatus for forming a fluorescent screen for a color picture tube.

FIG. 7 is a perspective view showing a lamp house constituting the exposure apparatus.

FIG. 8 is a sectional view showing the lamp house.

FIG. 9 is an explanatory diagram showing an illuminance distribution of a mercury lamp constituting the lamp house.

FIG. 10 is an explanatory diagram for explaining the illuminance distribution by the lamp house.

FIG. 11 is an explanatory diagram showing another example of the illuminance distribution by the lamp house.

[Explanation of symbols]

 11: photosensitive layer 12: shadow mask 13: face panel 14: support base 16: lamp house 17, 18, 19: correction lens 23: ultra-high pressure mercury lamp (lamp for light source) 24: housing 25: slit 26: light shielding plate 27: drive shaft 28: drive device

Claims (4)

[Claims] 1. An exposure apparatus for forming a fluorescent screen on a face of a color picture tube for forming a phosphor screen on an inner face of a face panel of the color picture tube, wherein a photosensitive layer is formed on an inner surface, and a shadow mask is opposed to the photosensitive layer. A support base for supporting and positioning the mounted face panel; and a lamp movably installed with a built-in light source lamp that is disposed to face the support base and irradiates the photosensitive layer with ultraviolet light via the shadow mask. A house, a light-shielding plate disposed on the shadow mask side of the lamp house and having a slit through which ultraviolet light of the light source lamp passes, and correcting the ultraviolet light emitted through the slit of the light-shielding plate to a predetermined trajectory. And a driving device for selectively moving the light shielding plate with respect to the light source lamp, wherein the light shielding plate is provided to the light source lamp. An exposure apparatus for forming a fluorescent screen of a color picture tube, wherein the exposure apparatus is configured to be relatively movable with respect to the color picture tube. 2. The exposure for forming a fluorescent screen of a color picture tube according to claim 1, wherein the light shielding plate is movable while maintaining a constant distance from the light source lamp in conjunction with the movement of the lamp house. apparatus. 3. The exposure apparatus for forming a fluorescent screen of a color picture tube according to claim 2, wherein the light shielding plate is independently movable in the same direction in conjunction with the movement of the lamp house. 4. A photosensitive layer formed on an inner surface of a face panel of a color picture tube having a shadow mask is irradiated with ultraviolet rays from a light source lamp through a slit formed in a light shielding plate and a correction lens for correcting the trajectory of the ultraviolet rays. Thereby, in the exposure method for forming a fluorescent screen of a color picture tube that exposes the photosensitive layer, the position of the light source lamp is moved corresponding to the photosensitive layer, and the light-shielding plate is independent of the light source lamp. An exposure method for forming a fluorescent screen of a color picture tube, wherein exposure is performed by substantially changing an ultraviolet radiation position from the light source lamp by relatively moving.