JPH10255657A - Exposure equipment for fluorescent screen formation of color picture tubes - Google Patents

Abstract

[PROBLEMS] To provide an exposure apparatus for forming a phosphor screen of a color picture tube, which can improve the shape of a matrix hole of a dot matrix type phosphor screen and the shape of a dot phosphor layer. . SOLUTION: A light source unit 22 having a long light source 21 as a light source for printing a pattern corresponding to an opening of a shadow mask 4 on a photosensitive phosphor screen forming member layer formed on an inner surface of a panel 1, a light source unit and a shadow. An inclined lens group including a plurality of inclined lenses 41a and 41b, which are arranged between the mask and the inclined plane having a bias in the thickness in the transmission direction of light emitted from the light source unit.
40 and a drive unit that independently drives the tilt lens to rotate about the optical axis of light emitted from the light source unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure apparatus for forming a fluorescent screen of a color picture tube in which a fluorescent screen is formed by a photographic printing method.

[0002]

2. Description of the Related Art In general, a color picture tube has an envelope comprising a panel 1 and a funnel 2, as shown in FIG. 9, and a fluorescent screen 3 comprising a three-color phosphor layer is provided on the inner surface of the panel 1. A shadow mask 4 is arranged inside the fluorescent screen 3 so as to face the fluorescent screen 3. Meanwhile, funnel 2
An electron gun 7 for emitting three electron beams 6B, 6G, 6R is arranged in the neck 5 of the first embodiment. Then, the three electron beams 6B, 6G, 6R emitted from the electron gun 7 are deflected by the deflecting device 8 mounted outside the funnel 2, and the fluorescent screen 3 is scanned horizontally and vertically via the shadow mask 4. Thus, a structure for displaying a color image is formed.

In such a color picture tube, the three electron beams 6B, 6G, 6R emitted from the electron gun 7 are three electron beams arranged in a line consisting of a center beam and a pair of side beams passing on the same plane. In-line color picture tubes are currently the mainstream of color picture tubes.

In an ordinary in-line type color picture tube, the apertures of the shadow mask 4 are substantially rectangular apertures arranged in a line via a bridge. The three-color phosphor layer 3 is formed in a stripe shape. However, in a high-definition in-line type color picture tube used as a display tube of information equipment, the opening of the shadow mask 4 is circular, and in correspondence with this opening, 3 mm.
As shown in FIG. 10, the color phosphor layers are provided in the matrix holes of the matrix-shaped light-absorbing layer 10 having a circular matrix hole.
, 11R are dot matrix type fluorescent screens 3 provided so as to be embedded.

Conventionally, the fluorescent screen of the color picture tube is formed by a photographic printing method using a shadow mask 4 as a photomask. In particular, the dot matrix type fluorescent screen 3 is shown in FIGS. 11 (a) to 11 (g). As shown, first, the light absorption layer 10 is formed, and then the three-color phosphor layers 11B,
It is formed by a method for forming 11G and 11R.

That is, as shown in FIG.
First, a photosensitive agent is applied to the inner surface of the panel 1 to form a photoresist 13. Then, the shadow mask 4 is mounted on the panel 1 on which the photoresist 13 is formed, and is exposed using an exposure device described later, and a pattern corresponding to the circular opening 14 of the shadow mask 4 is printed on the photoresist 13. Next, the photoresist 13 on which the pattern is baked is developed to remove the unexposed portions, and a resist 15 having a dot pattern is formed as shown in FIG. Next, a light absorbing paint is applied to the inner surface of the panel 1 on which the resist 15 is formed, and a light absorbing paint layer 16 is formed as shown in FIG. Next, the light-absorbing paint layer 16 applied on the resist 15 is peeled off together with the resist film 15, and as shown in FIG. The layer 10 is formed.

After that, a photosensitive phosphor slurry containing a phosphor and a photosensitive agent as main components is applied to the inner surface of the panel 1 on which the light absorbing layer 10 is formed, and as shown in FIG. The luminescent phosphor slurry layer 18 is formed. Then, the shadow mask 4 is mounted on the panel 1 on which the photosensitive phosphor slurry layer 18 is formed, and is exposed using an exposure device described later.
The pattern corresponding to No. 4 is printed. Next, the photosensitive phosphor slurry layer 18 on which the pattern is baked is developed to remove the unexposed portions, and as shown in FIG.
A dot-shaped phosphor layer, for example, a blue phosphor layer 11B is formed in a predetermined matrix hole. This blue phosphor layer 1
1B is repeated for the green phosphor and the red phosphor, and the green phosphor layer 11G and the red phosphor layer 11R in the form of dots are formed in predetermined matrix holes of the light absorbing layer 10 as shown in FIG. Form.

The circular openings 14 of the shadow mask 4 are formed in the photoresist 13 and the photosensitive phosphor slurry layer 18 and the like.
As shown in FIG. 12 (a), an exposure apparatus used when printing a pattern corresponding to the following pattern is provided below the support table 20 for positioning and supporting the panel 1 and on the panel 1 positioned and supported by the support table 20. On the other hand, a long light source 2 such as a straight tube ultra-high pressure mercury lamp movably to a position corresponding to three electron beams arranged in a row and emitted from an electron gun of a color picture tube.
1 is provided as a light source.
Above, a pair of side beam-corresponding ΔS correction lenses 24 for approximating the trajectory of the light 23 emitted from the light source unit 22 to the trajectory of the electron beam emitted from the electron gun, and γ− for performing the correction accompanying the movement of the deflection center A ΔP correction lens 25, a correction filter 26 for correcting the light amount distribution on the inner surface of the panel 1, and the like are arranged. These ΔS correction lenses 2
4. γ-ΔP correction lens 25 and correction filter 26
Is the light source unit 22 while maintaining the relative position with respect to the light source unit 22.
It is moved with.

A pattern corresponding to the opening of the shadow mask 4 is printed on the photosensitive phosphor screen forming member layer 27 such as a photoresist or a photosensitive phosphor slurry layer formed on the inner surface of the panel 1 by such an exposure apparatus. When a matrix light absorbing layer or a dot-shaped three-color phosphor layer is formed, the shape and size of the matrix hole and the three-color phosphor layer of the light absorbing layer are determined by the shape of the light source, the amount of light from the light source unit 22, It is governed by the arrangement of the optical members, the exposure time, and the like. Especially in a color picture tube whose phosphor screen is a dot matrix type,
In order to increase the landing margin of the electron beam and to obtain a color picture tube in which the color purity can be easily adjusted, it is desired that the matrix hole of the light absorbing layer be a perfect circle.

[0010] Therefore, in the above exposure apparatus, FIG.
As shown in (b), a cover 29 having a slit-shaped opening 28 is provided near the long light source 21 such as a straight tube ultra-high pressure mercury lamp, and the slit-shaped opening 28 provided in the cover 29 , Which substantially regulates the size of the light source.

[0011]

As described above, the fluorescent surface of a high-definition in-line type color picture tube used as a display tube of an information device has a dot-shaped three-color phosphor in a circular matrix hole of a matrix-shaped light absorbing layer. It is a dot matrix type fluorescent screen provided so that the layer is embedded. The dot matrix type phosphor screen is formed by forming a light absorbing layer first and then forming a three-color phosphor layer by a photo printing method using a shadow mask as a photo mask.

Therefore, in the above color picture tube, it is desirable to make the matrix hole of the light absorbing layer a perfect circle in order to increase the landing margin of the electron beam and easily adjust the color purity. For that, Figure 1
As shown in FIG. 3, a cover 29 for substantially restricting the size of the light source composed of the long light source 21 of the exposure device used for printing a pattern corresponding to the opening of the shadow mask on the photoresist formed on the inner surface of the panel. Slit opening 2
8 (the opening diameter in the longitudinal direction of the long light source) to the inside diameter d of the long light source.
Should be approximately equal to However, as described above, the width w of the slit-shaped opening 28 of the cover 29 is
When the distance from the light source unit to the inner surface of the panel becomes large, as in a large color picture tube, the amount of exposure light for printing a pattern corresponding to the opening of the shadow mask in the photoresist becomes insufficient.

In order to solve the shortage of the exposure light quantity,
The input voltage of the light source may be increased, but there is a limit to the input voltage. In addition, the life of the light source is shortened. In addition, by increasing the exposure time, the shortage of the exposure light amount can be solved, but such a method reduces the production efficiency. Also, by increasing the inner diameter of the long light source to increase the amount of radiation,
Insufficient light exposure can be solved, but in this case, the outer diameter needs to be increased in order to maintain the strength of the glass envelope of the long light source. Therefore, the distance between the light source and the slit-shaped opening of the cover changes, and the positions of the matrix holes of the light absorbing layer and the three-color phosphor layer are shifted with respect to the openings of the shadow mask. Also, by increasing the width of the slit-shaped opening of the cover, the shortage of the exposure light quantity can be solved, but as shown in FIG. 14, when the width w of the slit-shaped opening 28 is increased, the matrix hole 17 of the light absorbing layer becomes longer. The light source has an elliptical shape whose major axis is in the center axis direction, and the landing margin is reduced.

Another method is disclosed in Japanese Patent Application Laid-Open No. 7-2352.
No. 71 discloses a method in which the width of the slit-shaped opening is widened and the light source unit is vibrated in a direction orthogonal to the central axis of the long light source. However, when the light source is vibrated in this way,
The origin position of the light source is likely to shift, and the landing may be shifted. Further, as shown in FIG. 15A, the light source image 3 projected on the inner surface of the panel through the opening of the shadow mask
1 is caused by vibration in a direction perpendicular to the central axis of the long light source,
Although the ellipticity of the matrix holes in the light absorbing layer shown in FIG. 4 is corrected, the matrix holes 17 become angular as shown in FIG.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended for forming a phosphor screen of a color picture tube in which a matrix hole of a dot matrix type phosphor screen and a shape of a dot phosphor layer can be improved. An object of the present invention is to configure an exposure apparatus.

[0016]

An exposure apparatus for forming a fluorescent screen of a color picture tube is disposed on a photosensitive fluorescent screen forming member layer formed on the inner surface of a panel so as to face the photosensitive fluorescent screen forming member layer. A light source unit having a long light source for emitting light for printing a pattern corresponding to the opening of the shadow mask, and a light-emitting phosphor layer forming member layer disposed between the light source unit and the shadow mask; Lens group consisting of a plurality of inclined lenses having an inclined plane with a bias in the thickness of the light emitted in the transmission direction, and the plurality of inclined lenses are moved from the light source unit toward the photosensitive phosphor screen forming member layer. And a drive unit that independently drives the rotation about the optical axis of the emitted light.

Further, the inclined lens group is composed of two inclined lenses which are coaxially stacked so that the inclined planes have substantially the same inclination angle and face each other, and these inclined lenses are used as a long light source. The drive unit is configured to have a drive unit that performs reverse rotation at a constant speed so that thick portions match in a direction perpendicular to the central axis.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an exposure apparatus used for forming a dot matrix type fluorescent screen of an in-line type color picture tube which is one embodiment of the present invention. This exposure apparatus has a support table 20 for positioning and supporting the panel 1, and below the support table 20, the panel 1 positioned and supported by the support table 20 is emitted from an electron gun of a color picture tube. A light source unit 22 is provided movably at a position corresponding to three electron beams arranged in a row, which includes a center beam and a pair of side beams passing on the same horizontal plane. The light source unit 22 uses a long light source 21 such as a straight tube ultra-high pressure mercury lamp as a light source, and the long light source 21 is disposed with its central axis (tube axis) being horizontal. Further, a cover 29 provided with a slit-like opening 28 for substantially regulating the size of the light source is arranged near the long light source 21. Also, this light source unit 2
A tilt lens group 40 to be described later is arranged on 2. Further, on the inclined lens group 40, a pair of side beam-corresponding ΔS correction lenses 24 for approximating the trajectory of the light 23 emitted from the light source unit 22 to the trajectory of the electron beam emitted from the electron gun, and moving the deflection center. Γ to perform the accompanying correction
A -ΔP correction lens 25, a correction filter 26 for correcting the light amount distribution on the inner surface of the panel 1, and the like are arranged. These tilt lens group 40, ΔS correction lens 24, γ
The −ΔP correction lens 25 and the correction filter 26 are moved together with the light source unit 22 by a mechanism (not shown) while maintaining the relative position with respect to the light source unit 22.

The inclined lens group 40 has an inclined plane in which the thickness of the light 23 radiated from the long light source 21 through the slit-shaped opening 28 of the cover 29 in the transmission direction is biased, and the inclined planes face each other. And two inclined lenses 41a and 41b coaxially arranged. These tilt lenses 4
Reference numerals 1a and 41b denote directions of rotation of the optical axis Zl of the light 23 emitted from the long light source 21 through the slit-shaped opening 28 of the cover 29 at a constant speed in the opposite direction and at the center axis of the long light source 21 (horizontal direction). ) Are driven to rotate so that thick portions overlap in the vertical direction perpendicular to ()).

FIG. 2 shows a drive mechanism of the tilt lens group 40. In this drive mechanism, the tilt lenses 41a, 41b
Are respectively supported by annular support frames 43a and 43b,
Annular gears 44a, 44b independently mounted on the outer circumferences of these support frames 43a, 43b, and an annular gear 44b mounted on the support frame 43b mounted on the rotating main shaft of the driving device 45 and supporting the inclined lens 41b. The gear 46 is configured to mesh with the gear 46 and a gear 47 that meshes with the two annular gears 44a and 44b and transmits the rotational driving force transmitted through the gear 46 and the annular gear 44b to the annular gear 44a. According to this driving mechanism, each of the inclined lenses 41a, 41a, 4 is driven only by the rotational driving force for rotating the gear 46 in one direction.
1b can be rotated in the opposite direction at a constant speed. The thick portions of the two inclined lenses 41a, 41b are matched in advance, and the thick portions of the inclined lenses 41a, 41b are aligned in the vertical direction perpendicular to the central axis of the long light source. , It is possible to rotate the light source so that thick portions overlap in the vertical direction perpendicular to the central axis of the long light source.

As described above, the inclined lens group 40 including the two inclined lenses 41a and 41b coaxially arranged so that the inclined planes face each other is arranged on the light source section 22, and the two inclined lenses 41a and 41b are arranged. 41b, the light 23 emitted from the light source unit 22 through the slit-shaped opening 28 of the cover 29 is rotated around the optical axis Zl of the light 23 in the opposite direction at a constant speed and in the vertical direction perpendicular to the central axis of the long light source 21. When the thick portions are rotated so as to overlap, the width of the slit-shaped opening 28 of the cover 29 that substantially regulates the size of the light source is increased,
Even if the amount of light emitted from the light source unit 22 is increased, the panel 1
The shape of the pattern corresponding to the opening of the shadow mask 4 to be baked on the photoresist 13 formed on the inner surface of the substrate can be improved, and the matrix hole of the formed matrix-like light absorbing layer can be made a perfect circle. The light source unit 22
Exposure time can be shortened by increasing the amount of light emitted from the.

That is, as shown in FIG. 3A, when a transparent plate 48 having a constant thickness is disposed on the light source unit 22, light emitted from the light source unit 22 through the slit-shaped opening of the cover is provided. Is radiated at a constant angle perpendicular to the optical axis Zl of the panel 1 through the aperture 14 of the shadow mask 4.
Reaches the inner surface of the panel 1 with respect to the optical axis Zl, as indicated by points 49a and 49b.

On the other hand, as shown in FIG. 3B, when the thick portion of the inclined lens 41 is arranged on the light source section 22 in the -vertical direction (-V axis direction), the shadow mask 4 The light 23 that reaches the inner surface of the panel 1 through the same opening 14 of
The point 49a shifts from the point 49c to the outside in the vertical direction, and on the thinner side, the point 49b shifts from the point 49d to the point in the vertical direction. When the direction of the tilt lens 41 is reversed and the thick portion of the tilt lens 41 is set in the + vertical direction as shown in FIG.
On the side of the thick part, the point shifts from the point 49b to the point 49d in the vertical direction outward, and on the side of the thin part, the point 49a shifts from the point 49a to the point 49c in the vertical direction inside. That is, by alternately reversing the direction of the inclined lens 41, the arrival point of light reaching the inner surface of the panel 1 through the same opening 14 of the shadow mask 4 is vertically swung without moving the light source unit. Can be done.

Therefore, the tilt lens 41 is connected to the light source 2
2 is rotated about the optical axis Zl of the light radiated through the slit-shaped opening of the cover, the thick portion of the inclined lens 41 is always located in the radial direction centered on the optical axis Zl. As shown in FIG. 4, the light reaches the inner surface of the first orbit 1 at a center in a circular orbit 50C, at an end of a vertical axis at an elliptical orbit 50V having a major axis in the vertical direction, and at a horizontal axis (H
Axis) At the end, an elliptical orbit 50H whose major axis is in the horizontal direction,
At the end of the diagonal axis (D axis), an elliptical orbit 50D having a major axis in the diagonal axis direction is drawn.

Therefore, when the width of the slit-shaped opening of the cover of the light source section is widened and the photoresist formed on the inner surface of the panel is exposed through a shadow mask, as shown in FIG. The matrix hole 17 of the absorbing layer has an elliptical shape whose major axis is in the horizontal direction at the center, and has an elliptical shape whose major axis is in the diagonal axis direction at the diagonal axis end, even if it can be corrected at the vertical axis end. At the end, an ellipse whose major axis is in the horizontal direction is promoted, and the matrix hole 17 cannot be made into a perfect circle over the entire phosphor screen.

However, as described above, the two inclined lenses face the inclined surfaces, and the thick portions are made to coincide with each other, and the thick portions are arranged in the vertical direction. 6 (a) through 6 (d), when the optical axis Zl of the light emitted through the slit-shaped aperture is rotated in the opposite direction at a constant speed around the rotation center.
As shown the relative relationship every four cycles (90 ° rotation),
The relative relationship between the two inclined lenses 41a and 41b changes. FIG. 7 shows the relative relationship between the two inclined lenses 41a and 41b replaced by one equivalent inclined lens.
The state shown in (a) to (d) is obtained. In other words, when shown by one equivalent tilt lens 41, two tilt lenses 4
The thick portions of 1a and 41b are turned in the opposite direction and become equivalent plate lenses, and the thick portions overlap and the inclination angle of the inclined surface of one equivalent inclined lens 41 becomes maximum. It changes continuously until. Note that the thicknesses are all equal at a portion intersecting the optical axis.

That is, the two inclined lenses 41a and 41b
The slanted lenses 41a and 41b are moved from the light source 22 to the cover 29 so that the slanted surfaces 41a and 41b
When the light 23 radiated through the slit-like opening 28 is rotated in the opposite direction at a constant speed around the optical axis Zl of the light 23, the flat → maximum inclination is + vertical → flat → One equivalent tilt lens 41 having the maximum tilt in the negative direction can be obtained.

As a result, as shown in FIG. 8, the trajectory 52 of the light source image projected on the inner surface of the panel through the opening of the shadow mask shifts in the vertical direction at the center, the vertical, and the end of the horizontal axis. At the end of the diagonal axis, it becomes a gourd shape extending in a direction perpendicular to the diagonal axis. The arrows in the figure indicate the case where the upper inclined lens 41a is clockwise and the lower inclined lens 41b is counterclockwise.
Since the trajectory 52 of the light source image has a larger vertical displacement than the horizontal direction and swings in the horizontal direction as well, the slit-shaped opening 28 of the cover 29 that substantially regulates the size of the light source is formed. Even if the width is increased and the amount of light radiated from the light source unit 22 is increased, the shape of the pattern corresponding to the opening of the shadow mask to be printed on the photoresist formed on the inner surface of the panel 1 is improved and formed. The matrix holes 17 of the matrix-shaped light absorbing layer 10 to be formed can be made a perfect circle. Further, the exposure time can be shortened by increasing the amount of light emitted from the light source unit 22.

In the above embodiment, the case where the matrix holes are formed in the matrix light absorbing layer has been described. However, the present invention is applied to the case where the dot phosphor layer is formed, and the same effect is obtained. can get.

[0031]

According to the present invention, an exposure apparatus for forming a fluorescent screen of a color picture tube is mounted on a photosensitive fluorescent screen forming member layer formed on the inner surface of a panel by using a shadow mask disposed opposite to the photosensitive fluorescent screen forming member layer. A light source unit having a long light source that emits light for printing a pattern corresponding to the opening, and a light source unit disposed between the light source unit and the shadow mask, and emitted from the light source unit toward the photosensitive phosphor screen forming member layer. Lens group consisting of a plurality of inclined lenses having inclined planes that are deviated in thickness in the direction of light transmission, and light emitted from the light source unit toward the photosensitive phosphor screen forming member layer from the plurality of inclined lenses. And a drive unit that rotates independently around the optical axis of the optical axis, and the inclined lens groups are coaxially stacked such that the inclined planes have substantially the same inclination angle and the inclined planes face each other. Done 2 If the tilt lens is configured to have a driving unit that performs reverse rotation at a constant speed so that the thicker portions in the direction perpendicular to the central axis of the long light source coincide with each other, the size of the light source is substantially increased. Even if the width of the slit-shaped opening of the cover that regulates the height is increased and the amount of light emitted from the light source unit is increased, the matrix holes and the dot-shaped phosphor layer of the matrix-shaped light absorbing layer can be made a perfect circle. it can. Also, due to the increase in the amount of light emitted from the light source,
Exposure time can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an exposure apparatus for forming a fluorescent screen of an in-line type color picture tube according to an embodiment of the present invention.

FIG. 2A is a perspective view showing a configuration of a drive mechanism of the tilt lens, and FIG. 2B is a cross-sectional view thereof.

FIGS. 3A to 3C are diagrams for explaining the operation of the tilt lens.

FIG. 4 is a diagram for explaining a trajectory of an arrival point of light on the inner surface of the panel when the tilt lens is rotated around an optical axis of light emitted from a light source unit as a rotation center.

FIG. 5 is a diagram illustrating a matrix of a matrix-shaped light absorbing layer obtained when the tilted lens is rotated about the optical axis of light emitted from the light source unit and the width of the slit-shaped opening of the cover of the light source unit is increased. It is a figure showing the shape of a hole.

FIGS. 6 (a) to 6 (d) show two inclined lenses, each having an inclined surface facing each other, and having thick portions coincident with each other, with the optical axis of the light emitted from the light source unit as the center of rotation. It is a figure which shows the relative relationship of two inclination lenses when rotating in the opposite direction at a constant speed.

7 (a) to 7 (d) are views showing states of the tilted lenses when the two tilted lenses shown in FIG. 6 are replaced by one equivalent tilted lens, respectively.

FIG. 8 is a panel in which the two inclined lenses are rotated in the opposite direction at a constant speed around the optical axis of light emitted from the light source unit, with the inclined surfaces facing each other and the thick portions thereof being matched. It is a figure for explaining rocking | fluctuation of a light source image on an inner surface.

FIG. 9 is a diagram showing a configuration of a color picture tube.

FIG. 10A is a plan view showing a configuration of a dot matrix type fluorescent screen, and FIG. 10B is a sectional view.

FIGS. 11A to 11G are diagrams for explaining a method of forming the dot matrix type fluorescent screen.

FIG. 12A is a diagram showing a configuration of a conventional exposure apparatus used for forming the dot matrix type fluorescent screen, and FIG. 12B is a diagram showing a configuration of a light source unit thereof.

FIG. 13 is a view for explaining the width of a slit-shaped opening of a cover constituting a light source unit of the exposure apparatus.

FIGS. 14A and 14B are diagrams for explaining the relationship between the width of a slit-shaped opening of a cover constituting the light source unit and the shape of a matrix hole of a light absorbing layer.

FIG. 15 (a) is a light source image swinging when the width of a slit-shaped opening of a cover constituting a light source unit is widened and the light source unit is vibrated in a direction orthogonal to a central axis of a long light source. FIG. 15B is a diagram for explaining the shape of the matrix holes of the light absorbing layer obtained as a result.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 4 ... Shadow mask 21 ... Long light source 22 ... Light source part 28 ... Slit-shaped opening 29 ... Cover 40 ... Inclined lens group 41a, 41b ... Inclined lens 44a, 44b ... Annular gear 45 ... Drive device 46 ... Gear 47 ... Gear

Claims (2)

[Claims] 1. A light for printing a pattern corresponding to an opening of a shadow mask disposed on the photosensitive phosphor screen forming member layer facing the photosensitive phosphor screen forming member layer on the photosensitive phosphor screen forming member layer formed on the inner surface of the panel. A light source unit having a long light source as a light source; and a light source unit disposed between the light source unit and the shadow mask, the light source unit being biased in a thickness in a transmission direction of light emitted from the light source unit toward the photosensitive phosphor screen forming member layer. An inclined lens group consisting of a plurality of inclined lenses having inclined planes having a plurality of inclined planes; and a plurality of the inclined lenses each having the optical axis of light emitted from the light source section toward the photosensitive phosphor screen forming member layer as a center of rotation. An exposure apparatus for forming a fluorescent screen of a color picture tube, comprising: a drive unit that is independently driven to rotate. 2. The tilt lens group is composed of two tilt lenses which are coaxially stacked so that the tilt planes have substantially the same tilt angle and face each other. These tilt lenses are connected to the central axis of the long light source. 2. The exposure apparatus for forming a fluorescent screen of a color picture tube according to claim 1, further comprising a drive unit that performs reverse rotation at a constant speed so that the thick portions coincide with each other in a direction perpendicular to the direction perpendicular to the direction.