JP2007025210A - Manufacturing method for transmission type screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and highly accurately form light intercepting parts that intercept noise light and transmit regular projection light, without disposing an optical recording medium, such as an adhesive photosensitive resin layer, on a lens sheet in a manufacturing method for a transmission type screen. <P>SOLUTION: While a lenticular lens sheet 4 having a cylindrical lens 4a and a substrate sheet 4b is conveyed in a fixed direction, illuminating light 8a is emitted from the cylindrical lens 4a side. In a fixed position on the back of the substrate sheet 4b, the illuminating light 8a condensed by a line reading section 9 is received. Thereby, an information acquiring step, in which information for forming BSs is acquired, is performed. Also, a light intercepting part formation step is performed such that, based on the acquired information, light interceptive toner 15 is disposed on the back of the lenticular lens sheet 4. Thus, a series of BSs are formed on the lenticular lens sheet 4 in the direction of conveyance of the lenticular lens sheet 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a transmission screen. For example, the present invention relates to a method for manufacturing a transmissive screen used in a projector, a rear projection television, or the like.

2. Description of the Related Art Conventionally, for example, a transmissive screen used for a projector, a rear projection television, or the like is perpendicular to a Fresnel lens sheet that makes projected light substantially parallel light and a substantially parallel light emitted from the Fresnel lens sheet to have a viewing angle. In addition, a configuration in which a lenticular sheet that diffuses light in the horizontal direction is combined is known.
In general, a lenticular sheet is provided with a viewing angle by arranging a plurality of cylindrical lenses to form an image of projection light in a linear shape and diffusing it in the vicinity of the imaging position. At this time, a light shielding portion called a black stripe that shields a portion other than the optical path of the projection light in the vicinity of the imaging position is formed to improve the contrast of the image.
For example, Patent Document 1 describes a transmissive screen manufacturing method in which a black stripe is formed by a so-called self-alignment method, which is not based on printing using a plate, in a transmissive screen having such a configuration.
The self-alignment method is a method in which a light-shielding layer is not formed / formed on a condensing part / non-condensing part by a lens using a condensing characteristic of the lens itself. For example, in Patent Document 1, an adhesive photosensitive resin layer is provided on the non-lens portion side of a lenticular lens sheet, and illumination light incident from the lens portion is collected to expose the adhesive photosensitive resin layer. Since the tacky photosensitive resin layer that has been exposed loses its tackiness, a black powder toner or a black colored layer is attached to a region where the tackiness remains, thereby forming a light shielding portion. Therefore, the black stripe can be formed by setting the photosensitive width of the illumination light to an appropriate width.
JP 2003-107584 A (page 2-5, FIGS. 1 and 2)

However, the conventional method for manufacturing a transmission screen as described above has the following problems.
In the technique described in Patent Document 1, the condensing position of the lens sheet is recorded by an adhesive photosensitive resin layer, which is an optical recording medium provided on the back side of the lens sheet, and the black stripe ( Although a light shielding part) can be formed, it is necessary to provide a process for applying an expensive adhesive photosensitive resin layer to the back surface of the lens sheet, which causes a problem that the manufacturing cost is high.
In addition, since the adhesive photosensitive resin layer remains in a cured state between the black stripes, depending on the surface property and transmittance of the cured adhesive photosensitive resin layer, a light amount loss occurs, and the transmittance of the transmission screen There is a problem of getting worse.

  The present invention has been made in view of the above-described problems, and does not provide an optical recording medium such as an adhesive photosensitive resin layer on a lens sheet, and shields noise light and transmits regular projection light. An object of the present invention is to provide a method of manufacturing a transmission screen that can be formed simply and with high accuracy.

In order to solve the above-described problem, in the invention according to claim 1, a lens unit in which a plurality of condensing lenses are arranged in parallel on the surface, and a transmission range of transmitted light of the lens unit on the back side of the lens unit is regulated. A transmissive screen comprising a lens sheet having a light-shielding part that irradiates illumination light from the lens part side of the lens sheet while transporting the lens sheet in a certain direction. By receiving the illumination light collected by the lens unit at a fixed position on the back surface side, an information acquisition step for acquiring information for forming the light shielding unit is performed, and acquired by the information acquisition step. A light shielding part forming step of arranging a light shielding part forming material having a light shielding property on the back side of the lens sheet corresponding to the acquisition position of the lens based on the obtained information. The light shielding portion of the sheet and method for continuously forming over the conveying direction of the lens sheet.
According to the present invention, while conveying the lens sheet in a certain direction, the illumination light transmitted through the lens part of the lens sheet is received by the information acquisition process, and the information for forming the light shielding part is obtained to form the light shielding part. By arranging the light shielding part forming material on the back side of the lens sheet corresponding to the information acquisition position based on the information acquired in the information acquisition process by the process, the light shielding part is continuously formed on the lens sheet.
For this reason, the light shielding part forming material is arranged on the lens sheet so as to accurately correspond to the optical path passing through the lens part without providing an optical recording medium such as an adhesive photosensitive resin layer on the lens sheet. A light shielding part is formed with high accuracy.

Here, continuously forming does not necessarily mean that the formed light-shielding portions are continuous, and the light-shielding portions can be continuously formed as necessary along the transport direction without stopping or interrupting the transport. Means.
For example, if the necessary arrangement pattern of the light shielding part is a horizontal stripe having a gap in the transport direction, it is natural that the light shielding part is formed continuously in the width direction and discontinuously in the transport direction.
Also, for example, in order to sequentially form light-shielding portions for different transmissive screens along the transport direction, the arrangement pattern of the light-shielding portions may be switched continuously or discontinuously without interrupting the transport during the transport. Good.
The lens sheet may be a continuous sheet or a cut sheet.

According to a second aspect of the present invention, in the transmissive screen manufacturing method according to the first aspect, the light shielding part forming step exposes a charged photoreceptor on the basis of information acquired by the information acquiring step. Forming an electrostatic latent image, developing the electrostatic latent image with the light shielding portion forming material, and transferring the developed image of the light shielding portion forming material to the lens sheet, thereby forming the light shielding portion forming material. This is the method of performing the arrangement.
According to the present invention, by exposing the charged photoreceptor to an electrostatic latent image, developing the electrostatic latent image with the light shielding part forming material, and transferring the image onto the lens sheet, the light shielding part is repeated. Are formed continuously. Therefore, by changing the formation position of the electrostatic latent image, the formation position of the light shielding part can be easily adjusted, so that the light shielding part can be formed with high accuracy.

According to a third aspect of the present invention, in the transmissive screen manufacturing method according to the first or second aspect, the illumination light is formed on the light-receiving surface at the predetermined position, and the formation position and the formation size of the light-shielding portion. It is set as the method of condensing in the range corresponding to.
According to the present invention, since the illumination light is condensed at the light receiving position on the light receiving surface at a certain position so as to be the formation position and the formation size of the opening of the light shielding portion, the position and size of the received light flux By detecting this, information for forming the light shielding part is directly obtained.

According to a fourth aspect of the present invention, in the transmissive screen manufacturing method according to the first or second aspect, the information for forming the light shielding portion acquired in the information acquisition step is a center position of the light shielding portion. In the light shielding part forming step, the light shielding part forming material is arranged based on the information on the center position and the information on the opening shape stored in advance.
According to this invention, since the information on the center position of the light shielding portion is acquired, the information for forming the light shielding portion is generated by combining with the information on the opening shape stored in advance, and the light shielding portion forming material is arranged. can do.
Further, in order to detect the center position of the light-shielding portion, it is only necessary to receive the illumination light on a substantially imaging plane, so that it can be received without blurring and is less susceptible to noise and the like. Further, since the stored shape information is used for the aperture shape information, the blur of the received light image does not affect the shape of the light shielding portion. As a result, a highly accurate light shielding portion can be formed.

According to a fifth aspect of the present invention, in the transmissive screen manufacturing method according to any one of the first to fourth aspects, after the light shielding portion forming material is disposed on the lens sheet by the light shielding portion forming step. The method includes a fixing step of fixing the position of the light shielding part forming material on the lens sheet.
According to this invention, since the light shielding part forming material transferred onto the lens sheet is fixed at the position by the fixing step, for example, when performing a post process such as forming a diffusion layer on the light shielding part forming material, It is possible to prevent the pattern arrangement of the light shielding part forming material from being disturbed.
As the fixing means, an appropriate means can be adopted according to the type of the light shielding part forming material. For example, when the light shielding part forming material is toner, the same means as those used in the fixing step in the electrophotographic process can be employed. That is, heat roller fixing or the like can be employed.
The degree of fixation is not limited as long as it does not hinder the subsequent process. For example, the surface of the light shielding part forming material may be softened and fixed to each other and to the lens sheet surface.

  According to the transmissive screen manufacturing method of the present invention, the illumination light transmitted through the lens unit in the information acquisition process is received to obtain information for forming the light shielding part. In the light shielding part forming process, the information in the information acquisition process is obtained. Since the light shielding part is continuously formed on the lens sheet by arranging the light shielding part forming material, it is simple and highly accurate without providing an optical recording medium such as an adhesive photosensitive resin layer on the lens sheet. There is an effect that the light shielding portion can be formed.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
A method for manufacturing a transmission screen according to an embodiment of the present invention will be described.
FIG. 1 is a schematic cross-sectional explanatory view for explaining a schematic configuration of a transmissive screen manufactured by a transmissive screen manufacturing method according to an embodiment of the present invention. FIG. 2 is a cross-sectional explanatory diagram for explaining a schematic configuration of an apparatus used in a method for manufacturing a transmission screen according to an embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 for describing the method for manufacturing the transmission screen according to the embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line BB of FIG. 2 for explaining the relationship between the information for forming the light shielding part and the light shielding part according to the embodiment of the present invention.
Each figure is a schematic diagram, and the dimensional ratio and shape are appropriately exaggerated and do not reflect actual dimensions.

A transmissive screen 1 as an example of a transmissive screen manufactured by the transmissive screen manufacturing method of the present embodiment will be described.
As shown in FIG. 1, the transmissive screen 1 has a plate-like Fresnel lens portion 2 and a lenticular portion 3 close to each other from the side (left side in the figure) on which projection light 50 for projecting an image is incident. It is arranged.

  The Fresnel lens portion 2 is for making the projection light 50 substantially parallel light. For example, the Fresnel lens sheet 2b formed of an ultraviolet curable resin or the like using a Fresnel lens mold, and appropriate rigidity and light transmittance. And a support substrate 2a for holding the Fresnel lens sheet 2b in a self-supporting manner. The Fresnel lens sheet 2b is fixed to the support substrate 2a with an adhesive or an adhesive.

The lenticular part 3 is formed by laminating a lenticular lens sheet 4 (lens sheet), a black stripe (hereinafter, BS) 5a (light-shielding part), a diffusion member 6, and a surface film 7 from the side facing the Fresnel lens part 2. .
The lenticular lens sheet 4 includes a plurality of cylindrical lenses 4a (condensing lenses) that extend in the illustrated depth direction and have the power to condense substantially parallel light emitted from the Fresnel lens unit 2 in one direction, for example, the illustrated vertical direction. Thus, a lens part is formed, and the lens part is a sheet-like member fixed to one side of the base sheet 4b.
In the present embodiment, the cylindrical lenses 4a are arranged in parallel at a pitch of 100 μm, for example.

The focal length of the cylindrical lens 4a is set so that substantially parallel light transmitted through the cylindrical lens 4a forms an image in the vicinity of the back surface, which is the other surface of the base sheet 4b to which the cylindrical lens 4a is fixed.
The lens cross-sectional shape of the cylindrical lens 4a is not limited to a spherical surface. For example, an elliptical surface, a parabolic surface, or a so-called aspherical shape including higher order terms may be used. When an aspherical lens is used, aberration during imaging can be reduced, and incident light can be refined, so that high S / N is easily realized and viewing angle characteristics are improved. .

As a material of the cylindrical lens 4a, for example, an ultraviolet curable resin can be employed. For example, a composition containing components of a bifunctional urethane acrylate oligomer, a monofunctional acrylate monomer, a bifunctional acrylate monomer, and a photopolymerization initiator is suitable.
The bifunctional urethane acrylate oligomer can be obtained by reacting various isocyanates and polyols, and those containing a polyester glue composed of neopentyl glycol and adipic acid are used as the polyol component. Since the component does not contain an aromatic ring, the light resistance is improved and the yellowing is small.
Various monofunctional acrylate monomers can be used. For example, dicyclopentanyloxy group-containing poly (n = 1 to 3) ethoxy acrylate can be used. The said component can give a softness | flexibility to hardened | cured material, Furthermore, since the dicyclopentanyloxy group contains the alicyclic structure, it is suitable at the point which can be made high refractive index.
The bifunctional acrylate monomer can be used in various ways. For example, at least one of bisphenol A poly (n = 2 to 10) ethoxydiacrylate, 1,6-hexanediol diacrylate, or nonanediol diacrylate is used. If used, or in combination, it is preferable because light resistance can be improved. In particular, bisphenol A poly (n = 2 to 10) ethoxydiacrylate is preferable in that it has a high refractive index and has a rigid structure, so that the cured product has toughness and easily imparts light resistance.

The base sheet 4b is not particularly limited as long as it is a light transmissive sheet-like member. For example, a polyester resin, a polystyrene resin, a polyolefin resin, an acrylic resin, a polycarbonate resin, a vinyl chloride resin, a polyethylene terephthalate (PET) resin, or the above-mentioned A sheet or film made of a blend or copolymer of these resins can be used.
In particular, it is desirable to employ a thin polyester and polycarbonate film having a thickness of 0.1 to 0.2 mm from the viewpoint of productivity. When such a thin film is used, since the rigidity as a screen is poor, the base sheet 4b is formed as a structure laminated on a transparent resin substrate having a thickness of 0.7 mm or more via an adhesive. However, it is preferable to maintain the strength.

The BS 5a is a plurality of light shielding portions that extend in the vertical direction of the back surface of the base sheet 4b and extend in the direction in which the cylindrical lens 4a extends with an appropriate gap. In the present embodiment, black toner is formed in a band shape.
The gap between the BSs 5a forms a slit-like transmission layer 5b through which light is transmitted. In the case of the present embodiment, the transmission layer 5b has a width of 30 μm and is formed within a range of ± 15 μm from the optical axis of the cylindrical lens 4a.
The BS 5a transmits approximately 100% of the projection light 50, and is provided to improve the contrast by blocking as much as possible the noise light incident from the outside of the optical path of the projection light 50. Therefore, the width of the transmission layer 5b is set to be substantially the same as or slightly wider than the light transmission range of the projection light 50.

The transmissive layer 5b is formed by forming a diffusing member 6 described later as a plate-like member, and is filled with the pressure-sensitive adhesive or adhesive when it is fixed with a light-transmitting pressure-sensitive adhesive or adhesive.
As the pressure-sensitive adhesive, acrylic or ethylene vinyl acetate-based pressure-sensitive adhesives are used, but the material and configuration are not particularly limited, and general-purpose pressure-sensitive adhesives can be used. It is also possible to use an ultraviolet curable adhesive instead of the adhesive.

  Further, when the diffusion member 6 described later is formed by applying a resin coating on the BS 5a and curing it, the transmission layer 5b is filled with the coating resin, and as a result, forms part of the diffusion member 6. May be. In this case, the transmissive layer 5b also has light diffusibility.

The diffusing member 6 diffuses the projection light 50 passing through the range of the transmissive layer 5b in two axial directions, for example, vertical (up and down in the drawing) and horizontal (front and back in the drawing) so as to have appropriate viewing angle characteristics. This is a sheet-like member having light diffusibility, and is provided to face the base sheet 4b.
The diffusing member 6 can be formed by dispersing a light diffusing agent having a higher refractive index than that of the base material in an appropriate light-transmitting resin base material. For example, it can be manufactured by melting a resin base material and kneading a light diffusing agent.
As the resin base material, the same resin material as that of the base sheet 4b can be preferably used.
As the light diffusing agent, inorganic powder or glass beads containing silicon, aluminum, calcium or their oxides, polymer beads obtained by crosslinking a resin, or the like can be used.

The diffusing member 6 may be a sheet or plate having an appropriate thickness previously fixed to the BS 5a with an adhesive or an adhesive, or a light diffusing agent in the resin base material. The base material 4b exposed between the BS 5a and the BS 5a may be coated and cured with the resin kneaded with the above.
Further, the diffusing member 6 may be formed by a two-layer structure of a translucent resin base material and a light diffusing layer. Such a two-layer structure is formed by fixing a translucent resin base material on the BS 5a, coating a light diffusion layer containing a light diffusion agent, or fixing a light diffusion sheet with an adhesive or the like. be able to.

  The surface film 7 is a film member attached on the diffusion member 6 in order to provide various functions on the outermost surface on the side where the transmission screen 1 is observed. Examples of various functions include an antireflection function and an antistatic function.

  Next, a method for manufacturing a transmission screen according to the present invention will be described focusing on a method for forming a light shielding portion. The manufacturing method of the Fresnel lens part 2 and the manufacturing method for providing the diffusing member 6 and the surface film 7 in the lenticular part 3 can appropriately use well-known techniques, and therefore detailed description thereof is omitted.

In this embodiment, after forming the lenticular lens sheet 4 into a sheet shape, the BS 5a is continuously formed on the base sheet 4b while being conveyed in a certain direction. The lenticular lens sheet 4 is subjected to a process of providing the diffusion member 6 and the surface film 7 after fixing the BS 5a. After these processes are completed, the lenticular lens sheet 4 is cut into an appropriate size to complete the lenticular part 3.
The BS5a forming method in the present embodiment includes an information acquisition process, a light shielding part forming process, and a fixing process described below. For example, the BS 5a is formed using the light shielding part forming apparatus 10 shown in FIG.
The light-shielding part forming apparatus 10 conveys the lenticular lens sheet 4 in a fixed direction (direction from left to right in FIG. 2) at a speed V, and performs each process sequentially and simultaneously in the conveyance process. is there.

The lenticular lens sheet 4 is conveyed with the cylindrical lens 4a facing downward in the figure and the base sheet 4b facing upward in the figure. The direction in which each cylindrical lens 4a extends can be set as appropriate. However, in the following, an example in which the cylindrical lens 4a extends along the transport direction (the right direction in FIG. 2) will be described.
The direction perpendicular to the conveying direction on the lenticular lens sheet 4 is hereinafter referred to as the width direction of the lenticular lens sheet 4. The dimension in the width direction is, for example, about 1 m to 1.3 m for a rear projection television.

A schematic configuration of the light shielding unit forming apparatus 10 will be described.
The light-shielding part forming apparatus 10 is provided on the upstream side in the conveyance direction of the lenticular lens sheet 4 and acquires the information for forming the BS 5a, and the BS 5a is formed based on the information acquired by the reading part 10A. The BS 15a pattern is formed by the toner 15 and transferred to the lenticular lens sheet 4, and the image of the toner 15 arranged on the lenticular lens sheet 4 is fixed on the lenticular lens sheet 4. And a fixing unit 10C.
The toner 15 is not particularly limited in color as long as it has a light shielding property, but it is preferable to adopt a black color having a light absorption property so that reflected light does not become stray light. In the present embodiment, it is composed of colored thermoplastic resin powder having an appropriate glass transition temperature or melting point. For example, a dry toner used in a dry electrophotographic process can be preferably used.

The reading unit 10A includes an illumination unit 8 on the cylindrical lens 4a side and a line reading unit 9 on the base sheet 4b side, which are provided to face each other with the lenticular lens sheet 4 interposed therebetween.
The illumination unit 8 is for irradiating linear or strip-like illumination light 8a extending in the width direction of the lenticular lens sheet 4 (the depth direction in the drawing). For example, a configuration in which a cylindrical lens (not shown) is provided for guiding light from one light source through an optical fiber, closely arranging outgoing light on a straight line, and adjusting the spread angle of the light beam, A configuration in which the LEDs are arranged on a straight line and the respective emitted lights are condensed by a condenser lens can be employed.
The divergence angle of the illumination light 8 a is adjusted to the divergence angle of the projection light 50. In this embodiment, it is set to be approximately 0 °, that is, substantially parallel light.
The wavelength of the illumination light 8a is not particularly limited. For example, appropriate visible light can be suitably used. However, if the light has the same wavelength characteristics as the projection light 50, the BS 5a is formed with higher accuracy. Is preferable.

The line reading unit 9 is for detecting the illumination light 8a transmitted through the lenticular lens sheet 4 and outputting information such as a light receiving position and a light reception width. For example, a one-dimensional CCD having sensitivity to the wavelength of the illumination light 8a. A sensor or the like can be employed.
In the present embodiment, luminance data for each pixel received by the line reading unit 9 is binarized by providing a threshold value, and exposure data for turning on / off an exposure unit 13 to be described later corresponding to a dark part and a bright part, respectively. Generate directly.
Hereinafter, the arrangement position of the line reading unit 9 in the conveyance direction of the lenticular lens sheet 4 is represented as a position C.

In the present embodiment, the light-shielding part forming part 10B employs a mechanism that forms an image of the toner 15 by a dry electrophotographic method and transfers it to the lenticular lens sheet 4. The schematic configuration includes conveyance rollers 20a and 20b, a photosensitive drum 11 (photosensitive member), a charger 12, an exposure unit 13, a developing unit 14, a transfer unit 17, and a cleaning unit 18.
The charger 12, the exposure unit 13, the developing unit 14, the transfer unit 17, and the cleaning unit 18 are arranged in this order along the rotation direction around the circumferential direction of the photosensitive drum 11.

The transport rollers 20a and 20b are transport mechanisms for sandwiching the lenticular lens sheet 4 and transporting the lenticular lens sheet 4 in the right direction in the drawing at a transport speed V.
The conveying roller 20 a is a driving roller that is in contact with the base sheet 4 b and transmits a driving force from a motor (not shown) to the lenticular lens sheet 4. The conveyance roller 20b is an idler roller that is brought into contact with the cylindrical lens 4a. As the material of each roller portion, rubber, elastomer, foamed materials, or the like having appropriate elasticity can be used.
The linear speeds of the transport rollers 20a and 20b are synchronized with the linear speeds of the photosensitive drum 11 and the fixing roller 21a described later. The magnitude of the linear velocity is set within an allowable range of fixing conditions of the fixing unit 21.

The photosensitive drum 11 is formed by forming a photoconductive layer on the surface of a metal drum having a length equal to or larger than the width of the lenticular lens sheet 4 with an insulating layer interposed. The metal drum is grounded.
2 is brought into contact with the base sheet 4b and rotated at a linear speed equal to the conveying speed V of the lenticular lens sheet 4 by a driving mechanism (not shown).

The charger 12 is for uniformly charging the surface of the photosensitive drum 11. In the present embodiment, since reversal development is performed using a negatively charged toner as the toner 15, the toner 15 is charged to a negative potential.
As the charger 12, for example, a corona discharge generator or the like can be employed. Further, a structure of a charging roller formed from a rubber roller having resistance as appropriate may be adopted.

The exposure unit 13 scans a small spot light along a generatrix direction of the drum at a certain position on the photosensitive drum 11, for example, a position E in FIG. It forms an electrostatic latent image. For example, although not shown in detail, a scanning mechanism in which laser light 13a emitted from a laser light source such as a semiconductor laser is deflected by an optical deflector such as a polygon mirror and repeatedly scanned in a line by an fθ optical system or the like is employed. Can do.
The scanning of the laser beam 13a is controlled by a scanning start signal in the sub-scanning direction and a line synchronization signal for each scanning line in the main scanning direction. Here, the main scanning means scanning by the laser beam 13 a, and the sub scanning means scanning by rotation of the photosensitive drum 11. Therefore, the main scanning direction is along the width direction of the lenticular lens sheet 4, and the sub-scanning direction is along the conveyance direction of the lenticular lens sheet 4.
The laser beam 13a is modulated according to the exposure data generated by the line reading unit 9, and is turned on / off for each corresponding pixel position.

  The developing device 14 frictionally charges the toner 15, supplies the toner 15 to the surface of the photosensitive drum 11 by the developing roller 14 a to which the developing bias voltage is applied, and develops the electrostatic latent image at the position D on the photosensitive drum 11. Is to do. As the development method, either one-component development or two-component development may be adopted.

  The transfer unit 17 is a mechanism that transfers the image of the toner 15 developed on the photoconductive drum 11 to the lenticular lens sheet 4 side at a position facing the position T on the photoconductive drum 11. For example, a corona discharge generator Consists of. A transfer roller that forms an electric field for attracting the toner 15 may be used.

  The length of the arc EDT on the photosensitive drum 11 is such that after the illumination light 8a is read by the line reading unit 9, exposure data is formed and a scanning start signal is generated, and modulation of the laser light 13a is started based on the exposure data. The time until this is set as ΔT, and is set to be shorter than the distance CT by V · ΔT. Therefore, the reading position of the line reading unit 9 on the lenticular lens sheet 4 and the transfer position of the toner 15 are matched in the transport direction.

  The cleaning unit 18 is means for removing and collecting the toner 15 remaining on the surface of the photosensitive drum 11 so that the photosensitive drum 11 can be reused. For example, the cleaning blade 18a that contacts the counter on the photosensitive drum 11 is used. A configuration using can be adopted.

  Note that a conveyance guide plate 19 is provided between the conveyance roller 20b and the transfer unit 17 and between the transfer unit 17 and a fixing unit 21 described later, and faces the cylindrical lens 4a side to guide conveyance of the lenticular lens sheet 4. , 19 are provided.

In this embodiment, the fixing unit 10C is provided with a fixing unit 21 using a heat roller fixing method.
In the fixing unit 21, a fixing roller 21a is disposed on the base sheet 4b side of the lenticular lens sheet 4 to which the toner 15 image is transferred, and a pressure roller 21b is disposed on the cylindrical lens 4a side to form a fixing nip. The lenticular lens sheet 4 is conveyed while transferring the heat of the fixing heater 21b passing through the fixing roller 21a to the toner 15 on the lenticular lens sheet 4.
For the fixing roller 21a, for example, a configuration in which the surface of a metal cylindrical member is subjected to surface processing having toner releasability can be employed.
The pressure roller 21b can employ a configuration in which a heat-resistant rubber roller is formed on the rotating shaft. The pressing force of the pressure roller 21b is set to such an extent that the deformation of the lenticular lens sheet 4 is within an allowable range.

In the fixing unit 21, the fixing conditions for determining the amount of heat supplied to the toner 15, that is, the roller linear velocity, the nip width, the surface temperature of the fixing roller 21 a, etc., soften or melt the toner 15, and the lenticular lens sheet 4. It is set so that thermal deformation or the like is below the allowable limit.
For example, if the base sheet 4b is a PET film having a glass transition temperature of 110 ° C., the temperature of the base sheet 4b is set so as not to exceed 110 ° C.

For example, in copiers and laser printers that employ dry electrophotography, the surface is subject to rubbing on the surface, such as holding the printed image in the hand or writing after fixing, so the toner will remain even if it is rubbed to some extent. Good fixability that does not peel is required.
On the other hand, in the present embodiment, after the toner 15 forms the BS 5a, the diffusion member 6 is formed on the BS 5a, so the BS 5a is fixed. It is sufficient that the toner 15 is fixed so as not to be disturbed by an air current or the like. Therefore, the toner 15 may be fixed to such an extent that the toner 15 is softened, fixed to each other, and agglomerated.
Therefore, the toner 15 does not need to be melted at the fixing roller temperature, and it is sufficient that the toner 15 is softened under a temperature condition that does not cause permanent thermal deformation of the base sheet 4b. That is, the glass transition temperature should just be comprised with the material lower than the glass transition temperature of the base sheet 4b. If these conditions are satisfied, toner used in a copying machine, a laser printer, or the like may be used in this embodiment. Even in this case, the temperature of the fixing roller 21a can be set lower than those devices. It is.

Next, a method for manufacturing the transmission screen according to the present embodiment will be described together with the operation of the light shielding part forming apparatus 10.
The information acquisition step of the present embodiment is a step of acquiring information for forming the BS 5a and sending it to the light shielding part forming apparatus 10.
As shown in FIG. 3, first, the illumination unit 8 irradiates illumination light 8a toward the cylindrical lens 4a.
When the illumination light 8a enters each cylindrical lens 4a, the illumination light 8a travels as convergent light by its power, and is emitted in the range of the width W on the back surface side of the base sheet 4b. Then, the convergence is further continued, and an image is formed at the image forming position F, and then enters the line reading unit 9 while diverging.
In the present embodiment, the position of the light receiving surface 9a of the line reading unit 9 is adjusted in advance to a position where the light flux has a width W on the light receiving surface. For example, the distance d is set from the surface from which the illumination light 8a is emitted.

The line reading unit 9 reads and binarizes luminance data of each pixel within a time during which the lenticular lens sheet 4 is conveyed by a predetermined pixel size corresponding to the size of the pixel in the conveyance direction, and binarizes each luminance data from the reference position 22. Read data 23 (information for forming a light shielding portion) corresponding to the position is output as, for example, a signal of a bright portion being high and a dark portion being low (see FIG. 4).
Therefore, as the lenticular lens sheet 4 is conveyed, the illumination light 8a is scanned rearward in the conveyance direction, data representing the two-dimensional luminance distribution is acquired, and sequentially transmitted to the exposure unit 13.

As shown in FIG. 4, in the light shielding part forming step, an image of the toner 15 arranged in a pattern based on the read data 23 which is the exposure data acquired in the information acquiring step is formed on the photosensitive drum 11, and the base sheet This is a step of transferring onto 4b.
First, a predetermined voltage is applied to the charger 12, the photosensitive drum 11 is uniformly charged to a negative initial potential, and rotates at a linear speed synchronized with the conveyance speed V.
Then, exposure scanning is performed at the position E by the exposure unit 13.
The laser beam 13a is emitted while the read data 23 is low corresponding to the dark part. In the exposed portion of the laser beam 13a, the surface charge of the photosensitive drum 11 is lost, and becomes approximately 0V, for example. As the photosensitive drum 11 rotates, the laser beam 13a is raster-scanned on the photosensitive drum 11. Therefore, an electrostatic latent image is formed corresponding to the two-dimensional luminance data of the read data 23, in which the part corresponding to the bright part is a negative potential with the initial potential and the part corresponding to the dark part is approximately 0V. In the present embodiment, a band-like low potential portion of approximately 0 V having a width of 70 μm (= 100 μm-30 μm) is formed at a pitch of 100 μm in the main scanning direction along the sub-scanning direction corresponding to the extending direction of the cylindrical lens 4a. .

  At this time, the exposure unit 13 scans the scanning data at the position E by delaying the read data 23 acquired at the position C by the time ΔT by the scanning start signal. Therefore, the timing at which the part on the base sheet 4b from which the read data 23 has been acquired reaches the position T coincides with the timing at which the electrostatic latent image exposed at the position E by the read data 23 reaches the position T.

  Further, the scanning start position of the electrostatic latent image in the main scanning direction is synchronized by being delayed for a certain time from the line synchronization signal, and the writing position is aligned in the sub scanning direction. This delay time is adjusted in advance so that the reference position 22 of the line reading unit 9 and the writing start position in the main scanning direction on the photosensitive drum 11 coincide. When the writing start position is shifted due to a change with time or temperature, the writing position can be corrected by readjusting the delay time.

  When the scanning line exposed at the position E reaches the position D, the toner 15 moves onto the photosensitive drum 11 according to the potential difference formed between the developing roller 14a and the photosensitive drum 11, and electrostatic latent The image is developed. That is, the toner 15 adheres to the exposed portion of the laser beam 13a.

When the developed toner 15 reaches the position T, the transfer unit 17 is operated, and the image of the toner 15 on the photosensitive drum 11 is sucked to the base sheet 4b side and peeled off from the surface of the photosensitive drum 11, Transferred onto the base sheet 4b.
At this time, since the positions of the electrostatic latent image in the main scanning and sub-scanning directions are synchronized according to the arrangement position of the line reading unit 9, it is accurately synchronized with the position obtained by the line reading unit 9, An image of toner 15 is formed. That is, in the present embodiment, a belt-like transfer toner image is formed in a range excluding a region having a width of 30 μm centered on the optical axis of the cylindrical lens 4a.

In the fixing step, the transfer image of the toner 15 thus formed on the base sheet 4 b is thermally fixed by the fixing unit 21.
The fixing roller 21a is rotated at a linear velocity V in a state where the roller surface temperature is controlled to a predetermined temperature, and the lenticular lens sheet 4 is sandwiched and conveyed between the opposing pressure roller 21b.
At this time, the amount of heat is supplied to the toner 15 within the nip width sandwiched between the fixing roller 21a and the pressure roller 21b. When the glass transition temperature is reached, the toner 15 is softened and thermally deformed according to the applied pressure. The toner 15 is fixed to each other and to the base sheet 4b. Then, when it comes out of the nip, it dissipates heat and the deformation state is fixed, and the toner 15 is fixed to the base sheet 4b.
In this way, the BS 5a is formed by the toner 15.

In the present embodiment, the lenticular lens sheet 4 is conveyed at a conveyance speed V in a fixed direction by the conveyance rollers 20a and 20b, and the photosensitive drum 11 and the fixing unit 21 in which the respective linear velocities are synchronized, respectively. Since the light-shielding part forming part 10B and the fixing part 10C are configured, the toner 15 is accurately placed by synchronizing the position of the lenticular lens sheet 4 in the conveyance direction by controlling the delay time from the information acquisition time of the line reading part 9. Can be transferred and fixed.
In the width direction of the lenticular lens sheet 4, the line reading unit 9 accurately acquires information for forming the light shielding unit corresponding to the transmitted optical path that passes through the lenticular lens sheet 4, and uses the line synchronization signal as a secondary signal. Since the electrostatic latent image based on the read data 23 is accurately formed by the exposure unit 13 whose position is adjusted in the scanning direction, the positional deviation in the width direction can be remarkably reduced.

  In addition, since the toner 15 is disposed directly on the base sheet 4b in order to form the BS 5a, it is not necessary to provide an optical recording medium such as an adhesive photosensitive resin layer on the base sheet 4b by applying or pasting the BS 5a. Can be formed simply.

Since the lenticular lens sheet 4 is conveyed in a certain direction and the information acquisition process, the light shielding part forming process, and the fixing process are sequentially and simultaneously performed on the conveyance path, the BS 5a is continuously formed. The lens sheet 4 can be manufactured efficiently.
At this time, there is an advantage that the shape of the BS 5 a can be changed according to the change of the read data 23. For example, when the BS 5a is formed by printing using a plate or the like, when trying to produce different types of transmission screens having different shapes of the BS 5a, it is necessary to change the setup and the manufacturing efficiency is poor. For example, such heterogeneous mixed production can be easily manufactured without reducing the production efficiency.
Moreover, if the process of forming the diffusion member 6 and the surface film 7 is further provided on this conveyance path, there is an advantage that the lenticular lens sheet 4 can be manufactured in one line.

Next, a modification of this embodiment will be described.
In the present modification, the line reading unit 9 is disposed at a distance d from the base sheet 4b so that the transmitted light corresponding to the formation position and formation width of the BS 5a can be received in the present embodiment. On the other hand, the line reading unit 9 is placed close to the base sheet 4b side and in the vicinity of the imaging position F, and the information acquisition process is performed.
In this case, the transmitted light of the illumination light 8a is substantially imaged on the line reading unit 9, and the line reading unit 9 receives high-luminance light in a narrow range. Then, the center pixel position of the light receiving width is calculated, information on the center position of the transmissive layer 5b to be formed is acquired, and this information is sent to the exposure unit 13.
The exposure unit 13 stores in advance a storage unit that stores information on the size of the gap of the transmission layer 5b, that is, the size of the gap between the BSs 5a, and information on the size of the gap between the BSs 5a stored in the storage unit and a line reading unit. Based on the center position information sent from 9, a signal processing unit is provided that generates a laser drive signal that turns off the laser beam 13a within a range in which the gap dimension is equally divided at the center position. Then, exposure scanning is performed based on the laser drive signal output from the signal processing unit.

  According to this modification, since the line reading unit 9 detects light in the vicinity of the imaging position, information with a high S / N ratio can be acquired, and a predetermined width stored in advance is set according to the information. Since the exposure is performed except for the above, there is an advantage that the light-shielding portion can be formed with high accuracy without changing the width of the BS 5a due to a change in the light receiving state.

In the above description, the light shielding part forming apparatus 10 has been described as an example using a dry electrophotographic process, but is not limited to such a configuration. That is, each configuration can be modified according to various well-known techniques in electrophotography and laser printer technology.
For example, although the exposure unit 13 has been described with an example using laser scanning, a light source using solid scanning in which solid-state light emitting elements are arranged in a line for each pixel may be used. The photosensitive drum 11 may be a belt photosensitive member. In the above description, the reversal development method is employed as the development method, but a regular development method in which the non-exposed portion is developed may be employed.

In the above description, the lenticular lens sheet 4 is transported using the transport rollers 20a and 20b. However, these roller transport mechanisms transport the lenticular lens sheet 4 as long as the toner 15 after transfer is not disturbed. It may be provided at a plurality of locations in the road, and the location is not particularly limited.
Moreover, it is not limited to a roller conveyance mechanism. For example, a mechanism for holding and carrying by vacuum suction may be employed.
Further, when the lenticular lens sheet 4 is a cut sheet, it can be handled in the same manner as a continuous sheet by being held and conveyed on a belt conveyance mechanism.

  In the above description, the lenticular lens sheet 4 is described as an example in which the cylindrical lens 4a is bonded to the base sheet 4b. However, as shown in FIG. 5, the cylindrical lens 4a, the base sheet 4b, and A lenticular lens sheet 40 in which is integrally formed can also be suitably employed.

In the above description, the example in which the light shielding part forming step is formed by the electrophotographic process has been described. However, the light shielding part is continuously formed based on the information obtained in the information obtaining process while the lens sheet is conveyed in a certain direction. Other means may be used as long as they can be formed.
For example, an ink jet printer method may be adopted. In this case, black ink having good affinity with the lens sheet is adopted as the light shielding part forming material, and a plurality of discharge nozzles corresponding to the printing pixels are arranged in a line shape in the width direction of the lens sheet, or in the transport direction. By reciprocally scanning a print head having a plurality of ejection nozzles in the width direction of the lens sheet, a light shielding portion can be formed directly and continuously on the lens sheet.
As the fixing step, for example, a dryer that promotes drying of the ink can be employed.

  In the above description, the lens unit is a cylindrical lens, but the lens unit may be a two-dimensionally arranged condensing lens group. In this case, according to the above-described embodiment, the light shielding portion is automatically formed in a lattice shape or a polka dot shape. In the modification of the above embodiment, the data on the gap of the light shielding portion may be replaced with data on the shape and size of the area of the light shielding portion.

In the above description, the example in which the light shielding part forming material is fixed in the fixing process has been described. However, the diffusion member 6 is not fixed to the lens sheet and the diffusion member 6 is fixed in its position. If it can be formed, the fixing step may be omitted.
For example, in the example of the above embodiment, if the electrostatic adsorption force between the toner 15 and the base sheet 4b is sufficiently strong and the toner 15 does not move or scatter while the diffusion member 6 is formed thereon, the fixing is performed. The process can be omitted. In addition, when an ink jet printer is employed, a fixing step is not required when the ink is naturally dried.

  In the description of the above embodiment, the line reading unit 9 is arranged at a distance d from the base sheet 4b, and the light receiving width is set to be the same as the width W of the illumination light 8a emitted from the base sheet 4b. However, the position may be adjusted so as to receive light having a width different from the width W within a range where contrast or vignetting of the illumination light 8a is allowed. For example, when the shape accuracy of the edge portion of the BS 5a is likely to vary at the time of transfer or fixing, the projection light 50 is made slightly wider than the width W so that the projection light 50 can reach the edge portion of the BS 5a even if the shape of the BS 5a varies slightly. It may be possible not to apply it.

  In the above description, the illumination light 8a incident on the lenticular lens sheet 4 has been described as having the same divergence angle as the projection light 50. For example, the gap between the BSs 5a is set to a value different from the width W. For example, the exposure width on the line reading unit 9 may be varied by varying the divergence angle of the illumination light 8a.

It is typical sectional explanatory drawing in order to demonstrate schematic structure of the transmissive screen manufactured with the manufacturing method of the transmissive screen which concerns on embodiment of this invention. It is sectional explanatory drawing for demonstrating schematic structure of the apparatus used for the manufacturing method of the transmission type screen which concerns on embodiment of this invention. It is AA sectional drawing of FIG. 2 for demonstrating the manufacturing method of the transmission type screen which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 2 for explaining the relationship between the information for forming the light shielding part and the light shielding part according to the embodiment of the present invention. It is typical sectional explanatory drawing for demonstrating the example of the other lens sheet which can use the manufacturing method of the transmission type screen which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission type screen 2 Fresnel lens part 3 Lenticular part 4 Lenticular lens sheet (lens sheet)
4a Cylindrical lens (lens part)
4b Base sheet 5a Black stripe (light shielding part)
DESCRIPTION OF SYMBOLS 8 Illumination unit 8a Illumination light 9 Line reading part 9a Light-receiving surface 10 Light-shielding part formation apparatus 10A Reading part 10B Light-shielding part formation part 10C Fixing part 11 Photosensitive drum (photosensitive body)
13 Exposure unit 13a Laser light 14 Developer 15 Toner (light shielding part forming material)
17 Transfer device 20a, 20b Conveying roller 21 Fixing unit 23 Reading data 50 Projection light

Claims (5)

A method of manufacturing a transmissive screen comprising a lens sheet having a lens portion in which a plurality of condensing lenses are arranged in parallel on a front surface and a light shielding portion that restricts a transmission range of transmitted light of the lens portion on a rear surface side of the lens portion. And
While conveying the lens sheet in a certain direction,
In order to form the light-shielding part by irradiating illumination light from the lens part side of the lens sheet and receiving the illumination light condensed by the lens part at a fixed position on the back side of the lens sheet While performing the information acquisition process to acquire the information of
Based on the information acquired by the information acquisition step, by performing a light shielding part forming step of arranging a light shielding part forming material having a light shielding property on the back side of the lens sheet corresponding to the acquisition position of the information,
A method of manufacturing a transmissive screen, wherein the light-shielding portion of the lens sheet is continuously formed in the conveying direction of the lens sheet. The light shielding part forming step includes
Based on the information acquired by the information acquisition step, the charged photoreceptor is exposed to form an electrostatic latent image,
Developing the electrostatic latent image with the light-shielding portion forming material;
By transferring the developed image of the light shielding part forming material to the lens sheet,
The method of manufacturing a transmissive screen according to claim 1, wherein the light shielding part forming material is arranged.   The transmissive screen according to claim 1, wherein the illumination light is condensed on a light receiving surface at the predetermined position in a range corresponding to a formation position and a formation size of the opening of the light shielding portion. Manufacturing method. The information for forming the light shielding part acquired in the information acquisition step is a center position of the light shielding part,
3. The transmission according to claim 1, wherein in the light shielding part forming step, the light shielding part forming material is arranged based on information on the center position and information on an opening shape stored in advance. Mold screen manufacturing method.   The fixing step of fixing the position of the light shielding part forming material on the lens sheet after the light shielding part forming material is disposed on the lens sheet by the light shielding part forming step. 5. A method for producing a transmission screen according to any one of 4 above.

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