JP3899681B2 - Lenticular sheet exposure equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exposure apparatus used for forming a light-shielding stripe pattern on a flat surface (non-lens portion side) of a lenticular sheet.
[0002]
[Prior art]
When the lenticular sheet is applied to a transmissive projection television screen, a light-shielding stripe pattern (black stripe, hereinafter referred to as BS) is formed at a position corresponding to a non-condensing portion of each cylindrical lens in order to improve contrast. This has been done conventionally.
[0003]
Various printing methods such as offset printing, gravure printing, and screen printing are conventionally used as the BS formation method. However, in the printing method, the positional accuracy is such that the image line portion becomes the light absorbing portion (BS). If the cylindrical lens (array) of the lenticular sheet is miniaturized and the lenticular sheet is enlarged, it becomes more difficult to produce and register (position) the printing plate.
[0004]
As a method for forming a light-shielding stripe pattern other than a normal printing method, a method described below is known as a method for forming a light-shielding stripe pattern with a certain positional accuracy on the back surface of a lens sheet without requiring a printing plate.
[0005]
(1) JP 59-121033 A positive photosensitive adhesive (adhesive that disappears when exposed to light) is disposed on the observation surface side of a transmission screen (lens sheet). After exposing the adhesive with a light beam projected from a projection light source (projector) or a light source having an opening equivalent to this from the opposite surface, the adhesiveness of the condensing part of each unit lens of the lens sheet is lost, By spraying light-shielding toner from the observation surface, sticking it to the unexposed areas where the adhesive remains, and removing excess toner from the areas where the adhesive has disappeared by exposure, it is easy and inexpensive without the need for a wet process. In addition, there is a method of obtaining a transmission type projection screen on which a pattern having excellent light shielding properties is formed. (See Figure 4)
[0006]
In the above (1), “It is important to provide a condensing part at the same position as when the screen is actually used, and an exposure light source is provided at the same or optically equivalent position as the projection light source. Although it is described as (Gazette 8th page, 6th to 9th lines), it is not disclosed at all about the relationship between the specific form of the lens sheet and the projection light source and the exposure optical system. Not.
[0007]
FIG. 5 is an explanatory diagram conceptually showing the usage state of the transmissive projection screen.
A transmissive projection screen is a combination of a Fresnel lens and a lenticular sheet. Projection light (similar to diverging light from a point light source) from a light source (projector) is converted into parallel light by a Fresnel lens, and the lenticular sheet is used. It functions to expand in the horizontal direction (the direction in which the cylindrical lenses are arranged side by side) and project it to the viewer side.
The BS is formed on a flat surface on the viewer side of the lenticular sheet in order to increase the contrast of the projected image.
[0008]
In other words, when it is assumed that “the condensing part is provided on the flat surface of the lenticular sheet at the same position as when the screen is actually used”, when the Fresnel lens is not used, the cylindrical lens side of the lenticular sheet Therefore, the entire surface must be exposed with parallel light.
[0009]
As shown in FIG. 6, when divergent light is irradiated instead of parallel light, the incident position of the light beam with respect to the cylindrical lens is different between the central portion (front surface of the light source) and the end portion of the lenticular sheet, so As a result, as a result, a BS is formed at a position corresponding to the valley portion of the lenticular as shown in FIG. 6A, but at the end portion corresponds to the center (optical axis) of the lens in FIG. 6B. The BS is formed at the position, and the BS formation position is different for each lenticular cylindrical lens.
For this reason, when a lenticular sheet having a BS as described above is used as a transmissive projection screen, since there is a Fresnel lens on the projection side, the projection light hits the BS at the edge of the screen, and the projected image to be observed This results in the disadvantage of lacking.
[0010]
In order to form a BS at the same position (similar non-condensing part for all cylindrical lenses) with respect to each cylindrical lens, it is necessary to expose the entire surface with parallel light. In consideration, it is necessary to combine a Fresnel lens and to provide a light source for exposure at the same or optically equivalent position as the light source (projector).
[0011]
Therefore, the following proposal has been made by the present applicant.
(2) Japanese Patent Application No. 8-27682 (see Fig. 7)
While relatively moving the lenticular sheet (1) having the electromagnetic radiation curable resin layer (synonymous with the above positive photosensitive adhesive) (2) and the light source (7) on the flat surface in the direction in which the cylindrical lenses are arranged side by side Then, a belt-like light beam extending in the longitudinal direction of the cylindrical lens is irradiated vertically from the cylindrical lens side to cure the curable resin layer in the light converging portion.
[0012]
According to (2) above, when the light from the light source is shielded by the light-shielding plate (8b) having the strip-shaped slit (8a) in order to obtain “a strip-shaped light beam extending in the longitudinal direction of the cylindrical lens”. The lenticular sheet must be arranged and relatively moved so that the longitudinal direction of the slit and the longitudinal direction of the cylindrical lens are parallel to each other, and the conveying direction of the lenticular sheet is restricted.
[0013]
Therefore, when manufacturing a lenticular sheet in the form of a web, the cylindrical lens must be arranged perpendicular to the conveyance direction of the lenticular sheet, and the stamper forming the cylindrical lens is also arranged in the direction perpendicular to the conveyance direction of the lenticular sheet. It will be subject to restrictions on manufacturing in the direction.
[0014]
Therefore, when manufacturing the stamper having a cylindrical lens on its surface in a state where the cylindrical lenses are arranged side by side, the cylindrical stamper corresponds to a projection screen of a plurality of sizes, so that the cylindrical lenses are arranged side by side on the outer periphery. In order to accurately reproduce the parallel arrangement state of the cylindrical lenses, the cylindrical stamper is used to accurately match the development length of the cylindrical lens with the circumferential length in order to accurately reproduce the parallel arrangement state of the cylindrical lenses. A highly accurate outer diameter is required.
[0015]
In addition, the cylindrical stamper surface is subjected to a shape change caused by rotation in order to form a desired cylindrical lens shape (the cylindrical stamper enters and exits from the lenticular sheet at the time of cylindrical lens molding). The shape must be considered, and high-precision processing technology is required.
[0016]
[Problems to be solved by the invention]
The present invention provides a light source device having a cylindrical light source that emits a light beam having a uniform intensity distribution around the cylindrical lens so that the cylindrical lens has a certain angle with the conveying direction of the lenticular sheet, so that the cylindrical lens is conveyed in the conveying direction of the lenticular sheet. The object of the present invention is to improve the exposure process so that exposure can be carried out even if they are arranged in parallel.
[0017]
In addition, even if the cylindrical lens is arranged in parallel with the conveyance direction of the lenticular sheet, by enabling exposure, the stamper shape that forms the cylindrical lens is also parallel to the conveyance direction of the lenticular sheet. An object of the present invention is to make it possible to manufacture a cylindrical stamper having an arbitrary outer diameter, and to process the stamper surface without considering a change in shape caused by rotation.
[0018]
[Means for Solving the Problems]
The present invention according to claim 1 is used for forming a light-shielding stripe pattern at a position corresponding to a non-light-collecting portion of each cylindrical lens on a flat surface of the other surface of the lenticular sheet in which cylindrical lenses are arranged side by side. A light source device having a cylindrical light source that emits light with a uniform intensity distribution in the surroundings and a slit toward the exposure surface, and the light source device has a certain angle with the conveyance direction of the lenticular sheet When the cylindrical lenses are arranged in parallel with each other in parallel with the conveying direction of the lenticular sheet, the light-shielding stripe pattern can be formed by the exposure method.
[0019]
According to a second aspect of the present invention, there is provided the lenticular sheet exposure apparatus according to the first aspect, wherein a plurality of the light source devices are arranged side by side at a constant angle with the conveying direction of the lenticular sheet. .
A plurality of light source devices arranged side by side are arranged on the cylindrical lens surface side while continuously transporting lenticulars of an arbitrary width by a light-shielding device (shutter) that can be opened and closed independently or an ON / OFF device that turns off the light source. The light-shielding stripe pattern can be formed by exposing from above.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 3 shows a molding process of a lenticular sheet. A UV curable resin (material: epoxy acrylate) (1b) is applied on a transparent base material (material: acrylic) (1a), and a stamper (10). Is cured at the same time as molding to form a cylindrical lens group, and polymerization adhesion is performed. At this time, since the stamper (10) is easily processed by a cutting machine having a periodic feed mechanism such as a lathe, the molding of the lenticular sheet (1) is performed in accordance with the conveying direction of the lenticular sheet (1) as shown in FIG. In parallel, the cylindrical lens group is formed on one side of the lenticular sheet (1).
The method of forming a lenticular sheet using a cylindrical stamper is such that the lenticular sheet (1) can be continuously formed. The production efficiency can be improved.
[0021]
In the examples of this description, the following were used to form black stripes (BS).
<Lenticular Sheet>
Thickness 1 A cylindrical lens group made of a cured product of UV curable resin (material: epoxy acrylate) is formed on an Omm transparent base material (acrylic), and both are polymerized and bonded together.
Cylindrical lens pitch 0.4 mm, spherical radius 0.35 mm, lens thickness 0.063 mm.
<Positive photosensitive adhesive layer>
Laminate a chromoline film (trade name, manufactured by DuPont) on the flat part of the lenticular. A polyester film was used as a protective film.
[0022]
(Exposure process)
FIG. 1 shows a schematic diagram of a light source part in an exposure process of a lenticular sheet provided with the positive photosensitive adhesive layer. Since the lenticular sheet (1) continuously formed is parallel to the conveyance direction of the lenticular sheet and the longitudinal direction of the cylindrical lens group, the light source device (20) having the belt-shaped slit (23) is fixed. Even if the lenticular sheet (1) is relatively moved (conveying direction), only several cylindrical lenses can be exposed, and all the cylindrical lens groups in the width direction in the conveying direction cannot be exposed. That is, the width that can be exposed is L sin θ if the length of the cylindrical light source is L.
Here, θ represents the angle between the longitudinal direction of the cylindrical lens group and the light source device (20).
[0023]
The cross-sectional structure of the light source device (20) has a reflecting mirror (22) on the opposite side of the slit (23) of the cylindrical light source (21) as shown in FIG. Is irradiated.
[0024]
θ is an angle that can be increased to the limit at which a black stripe can be formed except for the position corresponding to the center (optical axis) portion of the cylindrical lens of the lenticular sheet. If this angle is experimentally less than 15 degrees, it has been confirmed that the position of the black stripe is accurate and the stripe pattern is formed cleanly.
[0025]
When the value of Lsin θ is larger than the width of the lenticular sheet, exposure can be performed with one exposure apparatus. However, when the value of Lsin θ is smaller than the width of the lenticular sheet, the light source device is moved at a constant angle θ in the transport direction as shown in FIG. The lenticular sheet (1) conveyed directly under the light source device by the individual light source devices (20a, 20b, 20c, 20d) If division exposure can be performed by the apparatus, the lenticular sheet (1) having an arbitrary width can be exposed without being restricted by the width direction dimension Lsinθ of the light source apparatus, and the lenticular sheet can be continuously formed. As a result, it is possible to perform exposure while conveying the material, thereby improving production efficiency and making effective use of materials.
[0026]
In general, a plurality of light source devices are arranged side by side so that the exposure areas are in contact with each other. However, the exposure areas are overlapped, and the light beams of the light source devices that irradiate the overlapping areas are applied to the light amount adjustment mask (30). It is also possible to perform exposure with a constant light amount, and the light amount adjustment mask (30) eliminates the need for high-level assembly accuracy required to place light source devices side by side so as to contact the exposure area. It is also possible.
[0027]
The positive photosensitive adhesive layer (2) in the portion condensed by the lens function of the cylindrical lens is cured to make the portion non-adhesive. The portion of the positive photosensitive adhesive layer (2) that is not condensed depending on the lens function remains adhesive.
[0028]
(BS formation process)
The exposed lenticular sheet is removed from the apparatus, the protective film (3) on the positive photosensitive adhesive layer (2) is peeled off, and the photosensitive adhesive layer in an unexposed area having adhesiveness is colored black. .
As a coloring method, a method may be employed in which black toner of carbon black is sprayed over the entire flat surface and the black toner sprayed on the non-adhesive portion is removed. Alternatively, the transfer ink layer (black) of the transfer sheet is superimposed on the positive photosensitive adhesive layer (2), and the ink layer (black) is transferred and formed only on the adhesive layer having adhesiveness. A method in which the ink layer is not transferred may be used. In the case of this method, it is also effective to use the transfer sheet instead of the protective layer film (3).
[0029]
Through the above steps, a transmission screen with BS formed on the lenticular sheet can be manufactured. However, the following steps may be performed to further improve the performance.
The entire surface of the positive photosensitive adhesive layer is irradiated with ultraviolet rays to completely cure the photosensitive adhesive layer. Alternatively, a protective film may be formed by laminating a photosensitive film on the light shielding pattern and curing the photosensitive film by light irradiation so that the formed BS does not peel off.
[0030]
As the BS protective layer, a diffusive protective layer may be formed in order to diffuse light and widen the visual field region (observation from the flat surface side of the lenticular sheet). Examples of the protective layer having diffusibility include a type in which a dispersing agent such as silicon oxide and titanium oxide is mixed with a resin.
[0031]
【The invention's effect】
An exposure apparatus used to form a light-shielding stripe pattern on the flat surface of the other surface of the lenticular sheet having cylindrical lenses arranged side by side at a position corresponding to the non-condensing portion of each cylindrical lens. A light source device having a cylindrical light source that emits a light beam having an intensity distribution, and the light source device arranged at a certain angle with respect to the conveyance direction of the lenticular sheet, whereby the conveyance direction of the lenticular sheet and the longitudinal direction of the cylindrical lens Can be continuously and accurately exposed, and the web-like sheet is continuously fed from the winding, thereby improving the production efficiency of the lenticular sheet.
[0032]
In addition, the cylindrical stamper that molds the cylindrical lens can be fed periodically, such as a lathe, by enabling continuous and accurate exposure of the lenticular sheet in which the conveyance direction of the lenticular sheet and the longitudinal direction of the cylindrical lens are parallel. It can be easily produced by machining with a cutting machine having a mechanism.
[Brief description of the drawings]
1A and 1B are diagrams for explaining the outline of an exposure apparatus of the present invention, in which FIG. 1A shows the positional relationship between a lenticular sheet and a light source device, and FIG. 1B is an end view taken along line XX of the light source device;
FIG. 2 is a view for explaining an exposure apparatus of the present invention in which a plurality of light source devices are arranged side by side.
FIGS. 3A and 3B are diagrams illustrating the production of a lenticular. FIGS.
FIG. 4 is an explanatory diagram showing a method of forming a black stripe (BS) in the order of steps.
FIG. 5 is an explanatory diagram conceptually showing a usage state of a transmission screen.
FIG. 6 is a schematic diagram for explaining that the positional relationship of black stripes (BS) varies depending on exposure conditions.
FIG. 7 is a schematic view for explaining an exposure apparatus for forming a black stripe (BS) according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Lenticular sheet 1a ... Transparent base material 1b ... UV curable resin 2 ... Positive photosensitive adhesive layer 3 ... Protective film 4 ... Unexposed part 5 ... Exposed part (condensing part)
6. Black stripe (light-shielding stripe pattern)
7 ... Point light source 8a ... Slit 8b ... Light shielding plate 10 ... Stamper 20 ... Cylindrical light source devices 20a, 20b, 20c, 20d ... Cylindrical light source device group 21 ... Cylindrical light source 22 ... Reflector 23 ... Slit 30 ... Light quantity adjustment mask θ: Angle between the longitudinal direction of the cylindrical lens group and the light source device

Claims (2)

In an exposure apparatus used to form a light-shielding stripe pattern at a position corresponding to a non-light-collecting portion of each cylindrical lens on the flat surface of the other surface of the lenticular sheet in which cylindrical lenses are arranged side by side,
A light source device having a cylindrical light source that emits light of uniform intensity distribution around the periphery and a slit toward the exposure surface, and the light source device is installed at a certain angle with the conveyance direction of the lenticular sheet An exposure apparatus for a lenticular sheet that enables a light-shielding stripe pattern to be formed by an exposure method when cylindrical lenses are arranged in parallel with the conveyance direction of the lenticular sheet. 2. The lenticular sheet exposure apparatus according to claim 1, wherein a plurality of the light source devices are arranged side by side at a constant angle with a conveying direction of the lenticular sheet.

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