JP2002231135A - 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 capable of eliminating a shortage of light volume and a discontinuity by solving such problems that, when photosensitive layers at the horizontal axis ends and diagonal axis ends in the lateral direction are exposed to form particularly the fluorescent face of a highly accurate color picture tube formed in flat and wide angle, it is difficult to sufficiently assure the light volume of reflected light and, accordingly, the overall light volume becomes short, and the light volume becomes short and the continuity of distribution of the light volume is lost. SOLUTION: A first reflective plate 27 is disposed on the opposite side of the light shielding plate 26 of a mercury lamp 23 at a specified interval, and a second reflective plate 30 is disposed between the first reflective plate 27 and the mercury lamp 23 to set the substantial position of the light source of the reflected light so as to be positioned in the arc of the mercury lamp 23.

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 phosphor screen 53 in which a three-color phosphor layer is embedded in a gap between light absorbing layers in a matrix shape is frequently used.

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

First, after cleaning the inner surface of the face panel 51, polyvinyl alcohol (PVA) and ammonium bichromate (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. Is formed.

Thereafter, a phosphor slurry layer serving as a photosensitive layer mainly composed of 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 an electron beam passage hole of the shadow mask 54 is printed on a photosensitive layer 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, 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.
1. A metal-deposited film 7 on a glass transparent substrate 69 for correcting the light amount distribution with respect to the phosphor layer
A light amount correction filter 68 to which 0 is attached is provided.

The correction 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 used as a lamp 71 for a light source. A mercury lamp 71 is mounted inside the housing 72 so that the horizontal direction of the face panel 51 is the longitudinal direction through the pair of through holes.

A light shielding plate 74 having a slit 73 for adjusting the amount of light is provided inside a housing 72 opposite to the mercury lamp 71.
However, a transparent glass plate 75 is attached to the upper surface of the housing 72 above the light shielding plate 74 so that the longitudinal direction of the slit 73 is orthogonal to the axial direction of the mercury lamp 71. . Further, if necessary, a reflection plate 76 is arranged in the same direction as the tube axis direction of the mercury lamp 71 on the side opposite to the light shielding plate 74 facing the mercury lamp 71 so as to reflect the ultraviolet rays of the mercury lamp 71. In some cases, they can be used effectively.

As shown in FIG. 9, for example, the reflecting plate 76 is formed in a semicircular shape similar to the outer shape of the mercury lamp 71 on an aluminum or stainless steel base material.
9 is mirror-finished, and is parallel to the tube axis direction of the mercury lamp 71 as shown in FIG.
As shown in (b), it is fixed closely to the outer peripheral surface of the mercury lamp 71.

As shown in FIG. 10A, the reflecting plate 76 is arranged in parallel with the tube axis direction.
As shown in (b), it may be arranged at a certain interval from the mercury lamp 71.

Further, inside the housing 72, a mercury lamp 71 is provided.
The cooling liquid is filled so as to circulate in the housing 72 to facilitate heat radiation of the lamp housing 64.
The mercury lamp 71 is configured to be movable in the axial direction with respect to the housing 63.

As shown in FIG. 11, the general illuminance distribution characteristic L of the mercury lamp 71 used here is such that, as shown in FIG. 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 characteristic L, the horizontal (long axis) direction of the face panel 51 is set to H, and the center is set to H. If one direction, for example, the right direction is set to +, the opposite direction is set to −, and the diagonal axis direction is set to D, the longitudinal direction of the mercury lamp 71 is arranged parallel to the H direction, and the slit 73 of the light shielding plate 74 is This H
It will be installed in the vertical direction V orthogonal to the direction.

Therefore, for example, the ultraviolet light for exposing near the same end direction D + in the D direction from one end H + in the H direction of the face panel 51 is located on an extension line connecting the corresponding direction and the slit 73 as shown in FIG. In the drawing of the mercury lamp 71, a point a indicated by a black circle can be considered as a substantial light source position of direct light, and for the light reflected by the above-described reflector 76, the point b is similarly reflected light. It is considered to be a substantial light source position, and therefore, the actual exposure light beam is a light beam in which the direct light from the mercury lamp 71 and the light reflected from the reflector 76 are superimposed. Exposure can be performed with illuminance of twice as much light quantity as compared with the case where the plate 76 is not provided. Therefore, doubling the light amount in this manner is a convenient means for coping with a shortage of light amount at the time of exposing a color picture tube, which is increasing in size.

[0024]

On the other hand, a high-definition color picture tube has a large deflection angle and a wide angle as well as such a large size, and the face panel 51 having the wide angle has been described above. In the case of exposing the photosensitive layer 61 near the H + and H-ends and near the D + and D-ends, the emission angle of the exposure light beam naturally increases. That is, as shown in FIG. 13, the light source for exposing the H + end and the D + end has a large emission angle as in FIG. 12, so that the substantial light source position of the direct light is point a ′. The substantial light source position of the reflected light is point b '.

That is, as compared with the case of FIG.
A and b positions of
It moves to points a 'and b' in FIG. 13, respectively. The point a 'is not greatly affected because it is located within the arc of the mercury lamp 71, but the point b' is located at the electrode 77 portion of the mercury lamp 71 outside the range of the arc.

As a result, since the electrode 77 becomes a shadow and the light amount of the light source as the reflected light is insufficient, the direct light and the reflected light when exposing near the H + and H-ends and near the D + and D-ends are integrated. The light amount of the exposure light beam is not only significantly reduced in the hatched portion in FIG. 14, but also sharply decreases in the light amount distribution. A boundary occurs, and the light amount distribution becomes discontinuous.

Therefore, a light amount difference occurs between the central portion and the peripheral portion of the inner surface of the face panel 51 due to a difference in the incident angle of light, and a uniform or desired light amount distribution cannot be obtained over the entire photosensitive layer 61. The light absorption layer and the phosphor layer to be formed will not be of a predetermined size, and the design of a light amount correction filter for making such a light amount distribution suitable will increase the difficulty, and it will be extremely difficult to manufacture a color picture tube. Issues are emerging.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above problem. An object of the present invention is to provide an exposure apparatus and an exposure method for forming a phosphor screen.

[0029]

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 of the lamp for light passes, a correction lens for correcting ultraviolet light emitted through the slit of the light-shielding plate to a predetermined trajectory, and a light-shielding plate opposite to the light-source lamp. A first reflector that is disposed apart and reflects the ultraviolet light of the light source lamp; and a second reflector that is interposed and disposed so as to connect the first reflector and the light source lamp. The light source position of the reflected light emitted from the slit via the second reflector and the first reflector is set so as to be substantially between the electrodes of the light source lamp.

The photosensitive layer formed on the inner surface of the face panel of the color picture tube having the shadow mask is irradiated with ultraviolet rays from a light source lamp through a slit formed in the light shielding plate and a correction lens for correcting the orbit of the ultraviolet rays. Thus, in the exposure method for forming a fluorescent screen of a color picture tube for exposing the photosensitive layer, a first reflector is provided in parallel with the light source lamp, and the first reflector and the light source lamp are connected. By interposing the second reflector in such a manner as to interpose, the reflected light path connecting the slit to the light source lamp passing through the first reflector and the second reflector is formed between the opposing electrodes of the light source lamp. Is arranged so as to intersect with the intermediate position of the photosensitive layer, thereby exposing the photosensitive layer using direct light and reflected light from the light source lamp.

According to the exposure apparatus and method for forming a fluorescent screen of a color picture tube according to the present invention, the second reflector is used when exposing near the horizontal and diagonal ends. By setting the substantial light source position of the reflected light within the arc of the light source lamp, the shortage of the light amount of the exposure light can be solved and the continuity of the light amount distribution can be ensured.

[0032]

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 provided with 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 serving as a light source lamp is provided at a lower portion of the housing 15 so as to be selectively movable with respect to the face panel 13. From the lamp house 16 to the support 14, the lamp house 1
A correction lens 17 arranged to approximate the ultraviolet rays emitted from 6 to the trajectory of the electron beam and individually correspond to each of the blue, green, and red colors of the phosphor, a common lens 18 commonly used for each color, 19 and an optical lens system such as 19, and a light amount correction filter 22 having a configuration in which a metal deposition film 21 is formed on a glass transparent substrate 20 for correcting the light amount distribution with respect to the photosensitive layer 11 for forming a fluorescent screen formed on the inner surface of the face panel 13.
Is installed.

The correcting lens 17 corrects the trajectory of ultraviolet rays so that the position of each phosphor 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.

The lamp house 16 is aligned with the longitudinal direction of the electron beam passage hole forming the slot-shaped through hole of the shadow mask 12 attached to the face panel 13, 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.

The photosensitive layer 11 for forming the fluorescent screen of the color picture tube using the exposure apparatus thus constructed.
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 this exposure, development is performed to form a matrix-like 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 a light source lamp 23, for example, an ultra-high pressure mercury lamp 23.
Each of the opposing side surfaces is provided with a through-hole (not shown), and a mercury lamp 23 penetrates the pair of through-holes inside the housing 24 so that the horizontal direction of the face panel 13 corresponds to the longitudinal direction. Attached to be.

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 a transparent glass plate 29 is attached to the upper surface of the housing 24 on the upper part of the light shielding plate 26. I have.

On the other hand, a first reflection plate 27 is arranged on the opposite side of the light-shielding plate 26 so as to be parallel to the tube axis direction of the mercury lamp 23 and keeping a certain distance from the mercury lamp 23. Further, the outer periphery of the lamp cylinder 29 in the arc generation region between the tips of a pair of electrodes 28 constituting the mercury lamp 23 is opposed to each other so as to connect the first reflector 27 and the light shield 26. The second reflector 30 is arranged.

As shown in FIG. 3, the first reflection plate 27 is formed of a base material of aluminum or stainless steel in a semicircular shape similar to the outer shape of the mercury lamp 23 and faces the mercury lamp 23. The surface is arranged with a mirror finish, and the second reflection plate 30 is also made of the same member, and the opposing inner surface is made with a mirror finish, and the shape is also formed into a semicircular shape or a sector shape. .

Further, inside the housing 24, the mercury lamp 23
Cooling fluid is filled so as to circulate inside the housing 24 to facilitate heat radiation of the lamp housing 16. The entire lamp house 16 is movable in the axial direction of the mercury lamp 23 with respect to the housing 15. 15 attached.

When exposure is performed using the exposure apparatus having the above-described configuration, the inner surface of the face panel 13 constituting the color picture tube, which is the object of the exposure apparatus, is exposed to the PV.
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 hole 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 view of the case where the photosensitive layer 11 is exposed by the lamp house 16 using the mercury lamp 23 near the horizontal end and the diagonal end, the horizontal (long axis) direction of the face panel 13 is set to H. If one direction from the center, for example, the right direction is +, the opposite direction is-, the diagonal axis direction is D, and the horizontal direction from the center of the screen is + and-, the longitudinal direction of the mercury lamp 23 Is H
The slit 25 of the light shielding plate 26 is disposed in parallel with the
Are installed in the vertical direction V orthogonal to the H direction.

Accordingly, for example, an exposure light beam which is a total of direct light and reflected light for exposing near the same end direction D + in the D direction from one end H + in the H direction of the face panel 13 having a large deflection angle is as shown in FIG. A point A indicated by a black circle in the drawing of the mercury lamp 23 located on an extension line connecting the relevant direction and the slit 25 can be considered as a substantial light source position of the direct light. Similarly, the light source can be understood by tracing the optical path opposite to the reflected light. Therefore, when tracing this optical path, the optical path connecting the first reflecting plate 27 through the slit 25 and the mercury lamp 23, The point B at which the light is reflected by the first reflection plate 27, re-reflected by the second reflection plate 30, and arrives at the mercury lamp 23 in this optical path becomes a substantial light source of the reflected light.

Accordingly, the point B, which is a substantial light source of the reflected light, is applied to the second reflecting plate 30 by the electrode 28 of the mercury lamp 23.
To be in the discharge arc region located between the tips,
If the second reflector 30 is arranged at a position inside, that is, located inside the tip portions of both electrodes 28, the light source of the reflected light does not reach the position of the electrode 28 of the mercury lamp 23. As a result, no shadow portion is generated in the reflected light, and the light beam in which the direct light from the mercury lamp 23 and the reflected light from the first and second reflectors 27 and 30 are superimposed on each other is used as an exposure light beam. Can be used as
Even if the emission angle increases with the widening of the angle, the problem of insufficient light quantity near the end or the occurrence of a boundary of the light quantity distribution is eliminated, and continuity of light quantity can be ensured.

It should be noted that the present invention is not limited to the above-described embodiment, and the first or second reflecting plate is limited to the shape described above as long as the shape allows the reflected light to be used to the maximum. For example, the second reflector may be formed in a concave shape instead of a flat shape so as to be in a direction toward the arc central portion side of the mercury lamp while taking care not to hinder other exposure. If it is set, the light amount can be further increased, and it goes without saying that various other applications and modifications are possible.

[0051]

According to the present invention, when exposing the exposure layer formed on the inner surface of the face panel, the exposure can be performed without causing the shortage of the exposure light quantity, and the continuity of the light quantity distribution can be ensured. Therefore, it is possible to provide an exposure apparatus and an exposure method corresponding to enlargement and wide angle of a color picture tube.

[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 a perspective view showing a mercury lamp and first and second reflectors which also constitute the lamp house.

FIG. 4 is an explanatory diagram for explaining an exposure light beam 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 a relationship between a mercury lamp and a reflector which also constitute a lamp house.

FIG. 10 is an explanatory diagram showing a relationship between a mercury lamp, a reflector, and another example which similarly constitute a lamp house.

FIG. 11 is an explanatory diagram showing an illuminance distribution of a mercury lamp similarly configuring the lamp house.

FIG. 12 is an explanatory diagram for explaining an exposure light beam by the lamp house.

FIG. 13 is an explanatory diagram for explaining another example of the exposure light beam by the lamp house.

FIG. 14 is an explanatory diagram for explaining a light amount distribution of an exposure light beam.

[Explanation of symbols]

 11: Photosensitive layer 12: Shadow mask 13: Face panel 14: Support base 16: Lamp house 17, 18, 19: Correction lens 23: Lamp for light source (mercury lamp) 24: Housing 25: Slit 26: Light shielding plate 27: First reflector 28: Electrode 30: Second reflector

Claims (3)

[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 first reflection reflecting the ultraviolet light of the light source lamp, the correction lens being arranged on the opposite side of the light source lamp from the shield plate, and And a second reflector interposed so as to connect between the first reflector and the light source lamp, and the second reflector and the first reflector, An exposure apparatus for forming a fluorescent screen of a color picture tube, wherein a substantial light source position of the reflected light emitted from the slit is set between the electrodes of the light source lamp. 2. The apparatus according to claim 1, wherein the second reflector is located within a range between the front ends of the electrodes of the lamp for the light source. . 3. A photosensitive layer formed on the inner surface of a face panel of a color picture tube having a shadow mask is irradiated with ultraviolet light 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 light. Accordingly, in the exposure method for forming a fluorescent screen of a color picture tube for exposing a photosensitive layer, a first reflector is provided in parallel with the light source lamp, and a first reflector is provided between the first reflector and the light source lamp. By interposing a second reflector so as to connect the light source lamp, the reflected light path connecting the slit to the light source lamp via the first reflector and the second reflector is formed. The photosensitive layer is exposed by using direct light and reflected light from the light source lamp by arranging the photosensitive layer so as to intersect with an intermediate position between the opposed electrodes. Phosphor surface forming exposure method kinescope.