JP3988289B2 - Lenticular sheet exposure system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exposure apparatus used for forming a light shielding pattern on a flat surface (non-lens portion side) of a lenticular sheet.
[0002]
[Prior art]
When applying the lenticular sheet to a transmissive projection television screen, a light-shielding 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. Has been performed conventionally.
[0003]
Various printing methods such as offset, gravure, and screen are conventionally used as the BS formation method. However, in the printing method, printing with high positional accuracy such that the image line portion becomes a light absorption portion (BS) is used. If a plate is required and the cylindrical lens (array) of the lenticular sheet is miniaturized or the lenticular sheet is enlarged, it is more difficult to prepare and register (position) the printing plate.
[0004]
As a method for forming a light shielding pattern other than a normal printing method, a method described below is known as a method for forming a light shielding pattern with a certain positional accuracy on the back surface of the lens sheet without requiring a printing plate.
[0005]
As an example, the following proposal has been made by the present applicant.
<JP-A-10-090798>
Uniform strength distribution around the lenticular sheet with an ultraviolet ray curable resin layer (synonymous with positive photosensitive adhesive) formed on the other flat surface of the lenticular sheet with cylindrical lenses arranged side by side A cylindrical light source that emits the light beam, and a lenticular sheet holding portion (not shown) that is arranged around the light source so as to be bent and concentrically concentrically with the cylindrical shape. The lenticular sheet exposure apparatus is configured to move the ultraviolet light of the cylindrical light source located at the center of the cylindrical shape from the cylindrical lens side to the other flat surface of the lenticular sheet while moving in the parallel arrangement direction of the cylindrical lenses. The UV-curing type tree of the part irradiated vertically and condensed by each cylindrical lens of the lenticular sheet The layer is cured, and the black colorant is formed only in the uncured portion by utilizing the adhesiveness of the uncured resin layer in the uncondensed portion, and the light shielding stripe pattern is formed at the position corresponding to the non-condensing portion. There has been proposed a lenticular sheet exposure apparatus for forming the above.
[0006]
According to the above proposal, the BS can be formed at the same position with respect to all the cylindrical lenses of the lenticular sheet. Furthermore, the light from the light source can be used effectively, and the exposure time is shortened to obtain the necessary exposure amount. An object of the present invention is to provide an exposure apparatus capable of achieving the above.
[0007]
Depending on the lenticular sheet required for the transmissive projection screen, it is necessary to appropriately set the collimation angle θ of the irradiation light according to the desired exposure speed, BS width, and BS shape accuracy. However, the above proposal does not disclose any specific light source for setting the collimation angle θ and its structure.
[0008]
[Problems to be solved by the invention]
The present invention aims to improve the exposure process, and produces a wide variety of lenticular sheets according to the exposure speed, BS width, and BS shape accuracy when forming BS on the lenticular sheet for transmissive projection screens. An object of the present invention is to provide an exposure apparatus that can cope with conditions and has excellent productivity.
[0009]
[Means for Solving the Problems]
The lenticular sheet exposure apparatus of the present invention is
An exposure apparatus used to form a light-shielding stripe pattern at a position corresponding to a non-condensing portion of each cylindrical lens on a flat surface of the other surface of the lenticular sheet having cylindrical lenses arranged side by side. A cylindrical light source that emits a light beam having such an intensity distribution, and a lenticular sheet holding portion that is arranged around the light source so as to be bent and concentrically concentrically with the cylindrical shape of the light source. In the lenticular sheet exposure apparatus, a cylindrical light source provided with a diffusion layer concentrically with a hollow around the cylindrical surface of the light source is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, (a) is a conceptual diagram of the lenticular sheet exposure apparatus of the present invention. (B) is an enlarged sectional view of a cylindrical light source in which a diffusion layer is provided concentrically through a hollow around the cylindrical surface of the present invention provided in the lenticular sheet exposure apparatus.
A cooling water 13 passes through a cooling pipe composed of a water-cooling inner pipe 12 and a water-cooling outer pipe 14 sequentially in a concentric manner around a cylindrical light source 11, and a structure comprising a diffusion layer 16 through a hollow 15. This is a cylindrical light source 10. With the structure in which the diffusion layer is provided, even if the diameter of the light source is small, the diffusion layer around the light source has a function equivalent to that of a thick light source. Further, the collimation angle can be adjusted by changing the diffusion cylinder diameter.
As the diffusion layer in the present invention, a surface obtained by subjecting the surface to a surface of an ultraviolet transparent acrylic resin, quartz glass, pyrex glass or the like can be used. The surface roughening method is not particularly limited, and publicly known methods can be applied.
[0011]
FIG. 2 is an explanatory view showing an embodiment of the present invention. Hereinafter, it will be described in detail with reference to FIG.
FIG. 2- (a): Formation of an ultraviolet curable resin layer on the flat surface of the lenticular sheet.
A photopolymer (ultraviolet curable resin) 43 having adhesiveness in an uncured state is formed on a flat surface of a lenticular sheet 41 having a cylindrical lens 42 arranged on one side and the other side being flat. A BS forming lenticular sheet 40 in which a protective layer 44 (covering the adhesive portion of the photopolymer) is laminated is obtained.
As the lenticular sheet 41, a transparent thermoplastic resin such as an acrylic resin, a vinyl chloride resin, or a carbonate resin may be molded by any method, or a UV curable resin or an EB curable resin may be used. It may be made of a cured product of the resin using an ionizing radiation curable resin.
[0012]
In this description, the following are used.
<Lenticular sheet>
A cylindrical lens group made of a cured product of a UV curable resin (material: epoxy acrylate) is formed on a transparent substrate (material: acrylic) having a thickness of 1.0 mm, and both are polymerized and bonded.
Cylindrical lens pitch 0.4mm, spherical radius 0.35mm, lens part thickness 0.063mm, size 120cm × 90cm.
[0013]
<Photopolymer>
Chromaline film (DuPont brand name)
[0014]
<Protective layer>
Mylar film 【0015】
Fig. 2- (b) ... Exposure of ultraviolet rays to lenticular sheet The lenticular sheet for BS formation obtained above is moved in the juxtaposition direction of the cylindrical lens 42 with the exposure apparatus of the present invention. The resin layer (photopolymer) 43 is exposed to ultraviolet rays from the cylindrical lens 42 side.
As shown in FIG. 1, the exposure apparatus includes a cylindrical ultraviolet light source 11 in which a diffusion layer 16 is concentrically provided through a hollow 15 around a cylindrical surface of the light source, and a cylindrical shape and a concentric shape of the light source. And a lenticular sheet holding part (not shown) arranged around the light source so as to bend and hold the lenticular sheet 20 for BS formation.
In the figure, the irradiation range Θ is adjusted by the light from the light source corresponding to the “apertures” 30 and 30 ′, thereby controlling the region where the BS is formed.
The line width of the BS can be controlled by the exposure time.
[0016]
<Exposure conditions>
Light source used: near ultraviolet mercury lamp (output 13 kW, 120 W / cm, tube diameter 25 mm)
[0017]
The exposed BS forming lenticular sheet 50 obtained above cures the condensed portion 53 (2) of the resin layer 53 by the lens function of the cylindrical lens 52, as shown in FIG. 2 (c). The part is made non-tacky.
The portion of the resin layer 53 (1) that is not condensed by the lens function remains adhesive.
[0018]
The exposed lenticular sheet 50 is removed from the apparatus, and the lenticular sheet protective layer is peeled off to obtain the BS forming lenticular sheet 50.
[0019]
FIG. 2- (d) ... BS formation step The resin layer 53 (1) in the state having adhesiveness of the exposed BS forming lenticular sheet 50 obtained above is colored black by a desired method.
As a coloring method, the transfer ink layer 62 (black) of the transfer sheet 60 is superimposed on the resin layer 53, and the ink layer 62 is transferred and formed only on the adhesive resin layer 53 (1). The layer 53 (2) includes a method in which the ink layer 62 is not transferred.
Alternatively, carbon black black toner is sprayed on the entire flat surface 53, the black toner sprayed on the non-adhesive resin layer 53 (2) is removed, and the black toner is applied only to the adhesive resin layer 53 (1). You may employ | adopt the method of attaching.
[0020]
Next, the entire surface of the resin layer 53 is irradiated with ultraviolet rays to cure the uncured resin layer 53 (1), and the entire surface of the resin layer 53 is completely cured. (Not shown)
Alternatively, a protective film of BS 70 may be formed by laminating a photosensitive film on the light shielding pattern and curing the film by irradiating ultraviolet rays so that the formed BS 70 does not peel off.
[0021]
As the BS protective layer, a diffusive protective layer may be formed in order to diffuse light and widen the field of view (observation from the flat surface side of the lens sheet). (Not shown)
Examples of the protective layer having diffusibility include a type in which an inorganic fine powder such as silicon oxide or titanium oxide is mixed with a resin.
[0022]
Finally, as a specific example, a cylindrical ultraviolet light source center lamp 11 provided with a diffusion layer d = 30 mm of the present invention having an effective emission diameter of 20 mm was used. Assuming that the cylindrical diameter r = 160 mm to the diffusion layer provided through the hollow around the cylindrical surface and the distance L = 2000 mm from the center of the light source 11 to the workpiece of the lenticular sheet, the exposure irradiation range Θ = 60 degrees, and the collimation angle θ = 4.5 degrees could be realized. It was confirmed that a lenticular screen having a 1700 mm wide BS can be manufactured.
Further, by providing an exposure amount of 5 mW / cm ² and an irradiation width of 1000 mm corresponding to the stop 30, 30 ′ in the lens flow direction, the BS ratio (the ratio of the BS width to the aperture width of the lenticular lens) is 70%. Was exposed at a line speed of 3 m / min. Furthermore, it was confirmed that the BS width can be controlled in the range of the BS rate of 50 to 80% by adjusting the line speed.
[0023]
【The invention's effect】
The effects of the present invention are listed below.
(1) According to the exposure apparatus of the present invention, all the cylindrical lenses function in the same manner as when the parallel light is collectively irradiated onto the entire surface of the lenticular sheet from the cylindrical lens side. BS can be formed at a position equal to.
(2) Since the BS to be formed is for the non-condensing part by the irradiation of ultraviolet rays to the actual lenticular sheet, a light-shielding pattern can be formed with a certain positional accuracy in a place where the BS must be truly formed. Is done.
(3) By preparing light sources with different diffusivities in the diffusion layer on the cylindrical surface of the light source, and adjusting the collimation angle of the irradiated light, the exposure speed, BS width, and BS shape accuracy when forming the BS Accordingly, a single exposure apparatus can cope with the production conditions of various types of lenticular sheets, and an exposure apparatus with excellent productivity can be provided.
[Brief description of the drawings]
FIG. 1A is a conceptual diagram of a lenticular sheet exposure apparatus of the present invention.
(B) Sectional drawing of the cylindrical light source of this invention.
FIG. 2 is an explanatory view showing a BS forming method according to the present invention in the order of steps.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Cylindrical light source 11 of this invention ... Lamp 12 ... Water cooling inner tube 13 ... Cooling water 14 ... Water cooling outer tube 15 ... Hollow 16 ... Diffusion layer 20, 40, 50 ... Lenticular sheet 30, 30 '... BS for BS formation ... Lenticular sheet 42 ... Cylindrical lens 43 ... UV curable resin layer 44 ... Protective layers 43 (1), 53 (1) ... Uncured UV curable resin layers 43 (2), 53 (2) ... Hardened UV curing Mold resin layer 60 ... transfer sheet 61 ... base material 62 ... colorant
d ... Diffusion layer thickness
L: Distance from the center of the light source to the lenticular sheet
r… Cylinder radius θ from the center of the light source to the diffusion layer θ ... Collimation angle Θ… Exposure irradiation range

Claims (1)

An exposure apparatus used to form a light-shielding stripe pattern at a position corresponding to a non-condensing portion of each cylindrical lens on the flat surface of the other surface of the lenticular sheet having cylindrical lenses arranged side by side. A cylindrical light source that emits a light beam having such an intensity distribution, and a lenticular sheet holding portion that is arranged around the light source so that the lenticular sheet is bent and concentrically held concentrically with the cylindrical shape of the light source. A lenticular sheet exposure apparatus comprising: a cylindrical light source provided with a concentric diffusion layer concentrically through a hollow around a cylindrical surface of the light source.

Images