JP2017167326A - Method for manufacturing optical imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an optical imaging device 1 which prevents cracking of a light control panel 2 during manufacturing without requiring polishing and imparts good visibility to the light control panel 2.SOLUTION: A method for manufacturing an optical imaging device 1 includes: a laminate 50 manufacturing step of layering a large number of substances obtained by forming a light reflection layer 6 on one surface or both surfaces of a film base material 5 formed of a light transmission material to manufacture a laminate 50; a cutting step of cutting the laminate 50 in a direction perpendicular to the light reflection layer 6 to cut a light control panel 2 where the light reflection layer 6 becomes a flat light reflection section 3; a surface treatment step of uniformly applying a transparent resin 8 onto a cut surface of the cut light control panel 2 to smoothen the cut surface; and an arrangement step of facing surfaces of the two surface-treated light control panels 2 each other of which the flat light reflection sections 3 cross each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing an optical imaging apparatus that forms a stereoscopic image in the air on the side of an observer viewing an object.

  As a method of displaying an image in the space, there is a technique called a hologram that has been seen in amusement parks for a long time, but it is difficult to produce a scale feeling and is unsuitable for display applications. Since then, there have been various attempts to display images, but most of them remain in the way of floating in the air in a pseudo manner by projector projection onto water vapor, fog, smoke, or a thin plastic plate.

  In view of this, an optical imaging apparatus that can easily form a three-dimensional image of an object in the air on the side of an observer viewing the object has been proposed (Patent Document 1). This optical imaging apparatus uses two light control panels formed by arranging a number of strip-shaped planar light reflecting portions arranged at a constant pitch perpendicular to the plane of the transparent flat plate inside the transparent flat plate. The light control panel is made by superimposing the planar light reflecting parts orthogonal to each other, and the light incident from the object is continuously reflected by the orthogonal planar light reflecting parts, and the object is sandwiched between the optical imaging device and the object. A three-dimensional image of the object is formed in the air at a symmetrical position.

JP 2012-155345 A

  The manufacturing method of the optical imaging apparatus is generally as follows. That is, a plurality of transparent flat plates on which light reflecting layers are formed are bonded one by one to form a laminated body, and then the laminated body is cut in a direction perpendicular to the light reflecting layer to obtain a number of laminated bodies. A light control panel having a planar light reflecting portion is cut out, and then the cut surface of the cut light control panel is precisely polished to provide surface smoothness, and the two light control panels are separated into the respective planar light reflecting portions. The optical imaging device is manufactured by bonding them so as to be orthogonal to each other.

  As described above, in the conventional method for manufacturing an optical imaging device, in order to ensure the visibility of the light control panel, after cutting the laminate, the cut surfaces on the front and back of the light control panel are precisely polished to improve the surface smoothness. I was trying to put it out. This polishing requires a considerable amount of time, and the light control panel is easily cracked by stress during polishing, and in particular, there is a problem that it is easily broken from the laminated portion between the transparent flat plates. Moreover, since the laminated body was produced by bonding the transparent flat plates one by one, it took a lot of time and labor to obtain a laminated body of a predetermined size, and it was expensive.

The present invention has been made in view of the above-mentioned problems, and it is possible to prevent cracking of the light control panel being produced without requiring the polishing, and to make the light control panel have good visibility. An object of the present invention is to provide a method for manufacturing an imaging apparatus.
It is another object of the present invention to provide a method of manufacturing an optical imaging apparatus that can improve the processing efficiency of a process of forming a laminate from a large number of substrates.

A method for manufacturing an optical imaging device according to the present invention includes:
Two light control panels are produced in which a large number of strip-shaped planar light reflecting portions are arranged at a constant pitch inside the light transmitting material, and the two light control panels are crossed with each other. A method of manufacturing an optical imaging device in which surfaces are arranged to face each other,
Laminate production process for producing a laminate by laminating a large number of ones having a light reflecting layer formed on one or both surfaces of a film substrate made of a light transmitting material;
Cutting out the light control panel in which the laminated body is cut in a direction perpendicular to the light reflecting layer and the light reflecting layer becomes the planar light reflecting portion; and
A surface treatment step of smoothing the cut surface by uniformly applying a transparent resin to the cut surface of the cut light control panel;
And arranging the two surface-treated light control panels to face each other so that the respective planar light reflecting portions intersect each other.

  In the laminate production step, after stacking a large number of the film base materials on which a hot melt adhesive layer has been formed in advance, the laminate is produced by heating and adhering the film base materials at a time. be able to.

  The transparent resin used in the surface treatment step is preferably made of a resin having a total light transmittance of 70% or more, and has a refractive index in the range of 1.25 to 2.40 and the film base. It is preferable that the resin is made of a resin having a difference from the refractive index of the material of ± 0.5.

  In the surface treatment step, it is preferable that the transparent resin is uniformly applied to the cut surface of the light control panel in a thickness of 5 to 150 μm, and the light control panel is made of a film or plastic plate having a smoothness of 5 seconds or more. You may make it provide the surface smoothness by uniformly pressing the application surface of the transparent resin applied to the cut surface.

  It is preferable that the film base material used in the laminate manufacturing step is made of a resin or glass having a thickness in the range of 0.05 to 1.0 mm.

  According to the present invention, the cut surface of the light control panel cut out from the laminate has been conventionally polished. Instead of this polishing step, a transparent resin is uniformly applied to the cut surface of the light control panel. A surface treatment process is performed. Thereby, it is possible to give good visibility to the light control panel without polishing, and to give the light control panel excellent strength and prevent cracking. Therefore, the production yield of the light control panel is greatly improved.

  Moreover, in a laminated body production process, the production efficiency which produces a laminated body can be improved significantly by heating many film base materials laminated | stacked by the hot-melt-adhesive agent layer, and making it adhere | attach at once. Therefore, the productivity of the optical imaging apparatus can be greatly improved as a whole.

It is a perspective view which shows the structure of the optical imaging device by embodiment. It is a schematic diagram for demonstrating the effect | action which carries out an aerial image formation with an optical imaging device. It is sectional drawing which shows the structure of the film base material for manufacturing an optical imaging device. It is explanatory drawing which shows the outline of the manufacturing process of an optical imaging device.

Embodiments of the present invention will be described below with reference to the drawings.
First, the optical imaging apparatus 1 will be described.
As shown in FIG. 1, the optical imaging apparatus 1 includes two light control panels 2. The light control panel 2 is formed by arranging a large number of strip-like planar light reflecting portions 3 formed in the thickness direction inside the light transmitting material at a constant pitch. Then, the optical imaging apparatus 1 superimposes the two light control panels 2 so that the plane light reflecting portions 3 intersect each other (for example, orthogonal to the 90-degree position) face to face with each other. It is configured. In the optical imaging apparatus 1, protective plates 4 are respectively attached to the front and back surfaces of a bonded product obtained by bonding two light control panels 2 together. The protective plate 4 is preferably made of a transparent resin or glass, having a total light transmittance of 90% or more and a haze of 2 or less. Examples of the material of the protective plate 4 include transparent resins such as polyethylene terephthalate, polycarbonate, acrylic, polypropylene, vinyl chloride, polystyrene, cellulose acetate, polyurethane, allyl ester, polyimide, polyamide, and composite materials thereof. Is done.

  As shown in FIG. 2, in the optical imaging apparatus 1, the light beam from the object a of the object N is specularly reflected at the point c of the planar light reflecting portion 3 of the first light control panel 2, and then the second light The light is reflected at the point c ′ of the planar light reflecting portion 3 of the light control panel 2 and gathers at the point a ′. In addition, the light beam from b of the object N is reflected at the point d of the planar light reflecting portion 3 of the first light control panel 2, and the light is further d of the planar light reflecting portion 3 of the second light control panel 2. Reflect at 'point and gather at point b'. Therefore, according to the optical imaging apparatus 1, the object N forms the stereoscopic image N ′ at the symmetrical position with the optical imaging apparatus 1 as the center.

Next, a method for manufacturing the optical imaging apparatus 1 will be described.
(1) First, as shown in FIG. 3, a required number of film base materials 5 on which a light reflection layer 6 and an adhesive layer 7 are formed is prepared.
The film base 5 is a material that transmits light (visible light), and a resin or glass having a total light transmittance of 80% or more, preferably 90% or more is used. Moreover, in order for the film base material 5 to obtain the favorable visibility of the light control panel 2, the thing in the range whose refractive index is 1.4-1.8 is used. Examples of the light transmissive material of the film base 5 are transparent resins such as polyethylene terephthalate, polycarbonate, acrylic, polypropylene, vinyl chloride, polystyrene, cellulose acetate, polyurethane, allyl ester, polyimide, polyamide, and composite materials thereof. Etc. are exemplified.

  The film base material 5 constitutes a visual recognition part of the light control panel 2 by its thickness. In the light control panel 2, the film base material 5 is not visible from the film surface side. The visibility from the film end surface is required. That is, the thickness of the film base 5 forms a visibility region of the light control panel 2. As a result, when the film substrate 5 is thick, the optical imaging device 1 is highly visible. However, since the imaging of the object itself is large, the sharpness of the image is reduced in applications such as a display. On the contrary, when the film substrate 5 is thin, detailed imaging of an object by the optical imaging device 1 is possible, but the film substrate 5 is poorly handled and the workability at the time of manufacture is reduced and optical The overall visibility in the imaging device 1 tends to be low, and cracks are likely to occur during manufacture (such as when cutting out from the laminate 50), and the film base 5 when the light control panel 2 is formed. Since the adhesion area on the laminated surface between them becomes very narrow, sufficient adhesion cannot be maintained.

  From the above, the thickness of the film substrate 5 is suitably in the range of 0.05 to 1.0 mm, and preferably in the range of 0.1 to 0.5 mm.

  The light reflecting layer 6 is formed of a metal deposited film having light reflectivity such as aluminum, silver, titanium, tin, chromium, indium and the like. The light reflecting layer 6 becomes the planar light reflecting portion 3 of the light control panel 2. The light reflecting layer 6 may be formed only on one surface side of the film substrate 5, but is preferably formed on both surfaces of the film substrate 5, and the adhesive is formed on both surfaces of the film substrate 5. It becomes difficult to be affected by the layer 7, and a clearer image can be obtained in the optical imaging apparatus 1.

  The adhesive layer 7 is formed on one side of the film substrate 5. For this adhesive layer 7, a transparent hot melt adhesive is used. As the hot melt adhesive, those having a glass transition point of −10 to 150 ° C. are preferably used. For example, polyester resins, ethylene vinyl acetate resins, polyurethane resins, acrylic resins, copolymers thereof, etc. Is exemplified.

(2) And as shown to Fig.4 (a), many sheets of the prepared film base materials 5 are piled up, and the film base materials 5 are adhere | attached with the adhesive bond layer 7, and the laminated body 50 is produced.
In this case, the film base material 5 is formed by laminating a large number of film base materials 5 with the adhesive layer 7 formed on the one surface side directed in the same direction. In the case where the light reflecting layer 6 is formed only on one surface side in the film base material 5, a large number of film base materials 5 are laminated with the light reflecting layer 6 directed in the same direction. The adhesion between the film bases 5 is performed by heating the whole in this stacked state after the necessary number of film bases 5 are stacked. Thereby, all the film base materials 5 can be adhere | attached at once with the hot-melt-adhesive agent which is the adhesive bond layer 7 formed in the film base material 5, When it was made to adhere one by one like before Compared to the above, the laminate 50 can be produced easily and in a short time and at a low cost.

(3) Next, as shown in FIG. 4B, the laminated body 50 is cut out as the light control panel 2 by cutting in a direction perpendicular to the light reflecting layer 6 by a cutting means.
In this light control panel 2, a film base 5 made of a light transmitting material serves as a visual recognition part, a light reflecting layer 6 serves as a flat light reflecting part 3, and a band-like flat light reflecting part 3 is formed at a constant pitch inside the light transmitting material. It becomes the structure which arranged many by (equivalent to thickness of the film base material 5). The cutting width by the cutting means defines the band width of the band-shaped planar light reflecting portion 3 of the light control panel 2, and the thickness of the film substrate 5 corresponds to the pitch between the planar light reflecting portions 3. Therefore, the cutting width is set to about three times (0.15 to 3.0 mm) of the thickness (0.05 to 1.0 mm) of the film base 5 from the reflection efficiency in the light control panel 2. Preferably, if the thickness of the film base 5 is greater than 3 times, the number of reflections on the light control panel 2 increases, and the sharpness of the image by the optical imaging device 1 may be deteriorated. If the thickness is less than three times the thickness, the reflection on the light control panel 2 becomes a wide angle, and the image formed by the optical image forming apparatus 1 may be difficult to see.

(4) Next, as shown in FIG. 4 (c), as the surface treatment of the cut surface of the light control panel 2 cut out from the laminate 50, the transparent resin 8 is applied to the cut surfaces on both the front and back surfaces of the light control panel 2. Apply evenly. As a result, the cut surface of the light control panel 2 is smoothed by filling the unevenness of the surface by cutting with the transparent resin 8, and good visibility is imparted.

  In the conventional method, the cut surface of the light control panel 2 is precisely polished and smoothed to provide visibility. Therefore, it takes a considerable amount of time for polishing and is thin and laminated in the extending direction of the main surface. There is a problem that the light control panel 2 having a structure is easily cracked by the stress during polishing. On the other hand, according to the present method, the surface smoothness of the cut surface is ensured by uniformly applying the transparent resin 8 to the cut surface of the light control panel 2 without polishing. Good visibility can be easily imparted, and the transparent resin 8 can provide strength and prevent cracking with certainty. Therefore, high quality, high yield and high productivity can be greatly improved, and production costs can be reduced.

  For the transparent resin 8, a resin having a refractive index in the range of 1.25 to 2.40 is selected in order to obtain good visibility of the light control panel 2. That is, the transparent resin 8 is used within the range of the above refractive index because there is a possibility that a clear visibility cannot be obtained in the light control panel 2 when the refractive index is greatly different from the refractive index of the film substrate 5. A resin having a refractive index close to that of the film base 5, for example, a resin having a refractive index difference of ± 0.5 or less, more preferably ± 0.2 or less, is selected.

  Moreover, since the transparency resin 8 may reduce the visibility of the light control panel 2 when the total light transmittance is lower than 70%, the total light transmittance is 70% or more, preferably 90% or more. Is appropriate. Examples of the transparent resin 8 include transparent resins such as acrylate monomer, vinyl ether monomer, urethane acrylate, epoxy acrylate, polyester acrylate, acrylic acrylate, vinyl ether oligomer, alicyclic epoxy resin, and glycidyl ether epoxy. Is done.

  The coating thickness of the transparent resin 8 on the cut surface of the light control panel 2 is 5 to 150 μm, preferably 20 to 100 μm. That is, when the coating thickness of the transparent resin 8 is less than 5 μm, the roughness of the cut surface may not be compensated and sufficient light control panel 2 may not be obtained. On the other hand, when the coating thickness is greater than 150 μm. The transmitted image may be distorted, and the coating amount is increased, resulting in an increase in cost.

  Further, when the transparent resin 8 is applied to the cut surface of the light control panel 2, the surface is uniformly pressed against the coated surface of the transparent resin 8 with a film or plastic plate having a smoothness of 5 seconds or more. Thereby, the thickness of the applied transparent resin 8 can be uniformly applied, and the light control panel 2 with good visibility can be obtained. In this case, the film or plastic plate used as the pressing member is peeled off and removed. However, if it is a transparent film or plastic plate, it may be used by being held on the transparent resin 8 without being removed. .

(5) Next, as shown in FIG. 4 (d), the two light control panels 2 after the surface treatment are arranged at 90-degree positions where the respective planar light reflecting portions 3 are orthogonal to each other, and the panel planes are mutually aligned. Adhere with a transparent adhesive. Then, when the protective plates 4 made of transparent resin or glass are attached to the front and back surfaces of the bonded product, the optical imaging apparatus 1 shown in FIG. 1 is completed. Note that the bonding position of the two light control panels 2 is not limited to the 90-degree position where the respective planar light reflecting portions 3 are orthogonal to each other, and is arranged and bonded at a position where the plane light reflecting section 3 intersects larger or smaller than 90 degrees. The image forming position of the image by the optical image forming apparatus 1 can be adjusted by adjusting the crossing angle.

  As described above, the method for manufacturing the optical imaging apparatus 1 according to the embodiment has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are made within the scope of the technical idea derived from the claims. It is possible.

DESCRIPTION OF SYMBOLS 1 Optical imaging apparatus 2 Light control panel 3 Planar light reflection part 4 Protection board 5 Film base material 6 Light reflection layer 7 Adhesive layer 8 Transparent resin 50 Laminate

Claims (7)

Two light control panels are produced in which a large number of strip-shaped planar light reflecting portions are arranged at a constant pitch inside the light transmitting material, and the two light control panels are crossed with each other. A method of manufacturing an optical imaging device in which surfaces are arranged to face each other,
Laminate production process for producing a laminate by laminating a large number of ones having a light reflecting layer formed on one or both surfaces of a film substrate made of a light transmitting material;
Cutting out the light control panel in which the laminated body is cut in a direction perpendicular to the light reflecting layer and the light reflecting layer becomes the planar light reflecting portion; and
A surface treatment step of smoothing the cut surface by uniformly applying a transparent resin to the cut surface of the cut light control panel;
A method of manufacturing an optical imaging apparatus, comprising: a step of arranging the two light-control panels subjected to the surface treatment to face each other so that the respective planar light reflecting portions intersect each other. In the manufacturing method of the optical imaging device according to claim 1,
The laminate manufacturing step is a method of manufacturing an optical imaging apparatus in which a large number of the film bases on which a hot melt adhesive layer is formed in advance are stacked, and then heated to bond the film bases at a time. In the manufacturing method of the optical imaging device according to claim 1 or 2,
The said transparent resin used at the said surface treatment process is a manufacturing method of the optical imaging device which consists of resin whose total light transmittance is 70% or more. In the manufacturing method of the optical imaging device according to any one of claims 1 to 3,
The transparent resin used in the surface treatment step is an optical made of a resin having a refractive index in the range of 1.25 to 2.40 and a difference from the refractive index of the film substrate of ± 0.5. Manufacturing method of imaging apparatus. In the manufacturing method of the optical imaging device according to any one of claims 1 to 4,
The surface treatment step is a method of manufacturing an optical imaging apparatus in which the transparent resin is uniformly applied to a thickness of 5 to 150 μm on the cut surface of the light control panel. In the manufacturing method of the optical imaging device according to any one of claims 1 to 5,
The surface treatment step is to manufacture an optical imaging device that imparts surface smoothness by uniformly pressing the coated surface of the transparent resin applied to the cut surface of the light control panel with a film or plastic plate having a smoothness of 5 seconds or more. Method. In the manufacturing method of the optical imaging device according to any one of claims 1 to 6,
The said film base material used at the said laminated body preparation process is a manufacturing method of the optical imaging device which consists of resin or glass in the range of thickness 0.05-1.0mm.

Images