JP6686184B2 - Method of manufacturing stereoscopic image forming apparatus and stereoscopic image forming apparatus - Google Patents

Description

The present invention relates to a method and a stereoscopic image formed device manufacturing parallel arranged numerous strip-like metallic reflection surface (mirror surface) groups orthogonally arranged stereoscopic image imaging arrangement in plan view in upright condition.

As a device that forms a stereoscopic image by using light (scattered light) emitted from the surface of an object, for example, there is a stereoscopic image forming device (optical image forming device) described in Patent Document 1.
In this image forming apparatus, first and second light-reflecting surfaces, each of which is composed of a large number of strip-shaped metal reflecting surfaces and are arranged perpendicular to one surface of the transparent flat plates, are formed inside a pair of transparent flat plates. A light control panel of the first and second light control panels, and the first and second light control panels are faced to each other so that the light reflection surfaces of the first and second light control panels are orthogonal to each other. Is.

International Publication No. 2009/131128 International Publication No. 2015/033645 JP2012-247459A

In manufacturing the first and second light control panels in Patent Document 1, a plate-like transparent synthetic resin plate or glass plate (hereinafter, also referred to as “transparent plate”) having a metal reflection surface formed on one surface side and having a constant thickness. A) is laminated so that the metal reflection surface is arranged on one side, and a laminated body is produced, and the laminated body is cut out so that a cut surface perpendicular to each metal reflection surface is formed. There is.
For this reason, a large vapor deposition furnace is required for the work of forming the metal reflection surface on the transparent plate, and moreover, one or a few transparent plates are put into the vapor deposition furnace to deaerate them to a high vacuum, and then the vapor deposition process. It was necessary to repeat the operation of performing the above, and taking out the vapor-deposited transparent plate opened to the atmospheric pressure 100 times or more, which was an extremely time-consuming and time-consuming operation. In addition, the metal-vapor-deposited transparent plates are laminated to form a laminated body, and an operation of cutting the laminated body with an extremely thin predetermined thickness is performed to cut out the first and second light control panels from the laminated body. Since it is necessary to polish the cut surface (both sides) of the second light control panel, workability and manufacturing efficiency are poor.

Therefore, as in Patent Document 2, a groove having a rectangular cross section formed by parallel banks is formed on one surface, and a light control panel provided with an uneven plate material having light reflecting portions formed on parallel side surfaces facing each other. There is proposed a method in which two light control panels are provided and the two light control panels are faced to each other in a state where their light reflecting portions are orthogonal or intersect.
However, there has been a problem that if the height of the bank of the uneven plate material is increased (that is, the depth of the groove is increased) during injection molding, it becomes extremely difficult to remove the mold. Furthermore, it is difficult to make the side surface of the parallel groove a mirror surface even if the technique of Patent Document 2 is used, and there is a problem that there are many variations in products.

Further, in Patent Document 3, as a device for forming a stereoscopic image, a dihedral corner reflector array optical element (that is, light control) in which a plurality of cylindrical bodies each having two orthogonal side surfaces are projected on a substrate made of a transparent material. There is disclosed a reflector array optical device in which panels are vertically stacked on top of each other so that their orthogonal side surfaces are on the same plane.
In the optical device of Patent Document 3, since the upper and lower cylindrical bodies are connected to each other, the lengths of the reflecting surfaces (hereinafter, referred to as the first and second reflecting surfaces) that are orthogonal to each other are long, so that the collection from the target object is increased. Although the light range is expanded, the light reflected by the first reflecting surface is reflected by the second reflecting surface and needs to escape from the end of the tubular body, so that the light is effectively incident on the first reflecting surface. The angle of the light beam was limited, and it was difficult to form a bright real image.
In addition, the gap between the adjacent cylindrical bodies is air, and the gap should be filled with a transparent resin, and the filling resin should have the same or similar refractive index as the base transparent synthetic resin. Therefore, the technical idea of preventing the generation of a rainbow due to the difference in refractive index is not disclosed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a stereoscopic image forming apparatus and a stereoscopic image forming apparatus that are easy to manufacture and can obtain a clearer stereoscopic image. .

A method of manufacturing a stereoscopic image forming apparatus according to a first aspect of the present invention is formed by a groove having a triangular cross section having an inclined surface and a vertical surface on the front side of a plate material made of a first transparent resin, and the adjacent groove. A first step of producing a molding base material in which convex ridges each having a triangular cross section are arranged in parallel by any one of press molding, injection molding, and roll molding;
A second step of selectively forming a metal reflective surface on the vertical surface of the groove;
In the first and second light control panels respectively manufactured through the first step and the second step, the grooves are opposed to each other in a state where the metal reflection surfaces are arranged orthogonally in plan view, and The groove of the first and second light control panels is filled with an adhesive made of a second transparent resin having a refractive index η2 0.9 to 1.1 times the refractive index η1 of the first transparent resin, And a third step of joining the first and second light control panels in a deaerated state.

  In the method for manufacturing a stereoscopic image forming apparatus according to the first invention, the first light control panel is placed above the first light control panel with the first light control panel facing down and the second light control panel facing up. The adhesive on the first light control panel by pressing the second light control panel against the first light control panel with a press, and the adhesive is filled in the grooves of the first and second light control panels. Preferably.

According to a second aspect of the present invention, there is provided a method for manufacturing a stereoscopic image forming apparatus, comprising: a first transparent resin plate material; first and second grooves having a triangular cross section having vertical surfaces and inclined surfaces on both sides thereof; First and second ridges having a triangular cross section formed by the first and second grooves are formed, respectively, and the first and second grooves formed on both sides of the plate member are orthogonal to each other in plan view. A first step of manufacturing a molding base material to be arranged by a method of any one of press molding, injection molding, and roll molding;
A second step of selectively forming metal reflecting surfaces on the vertical surfaces of the first and second grooves on both sides of the molding base material;
A third step of filling the first and second grooves with a filler composed of a second transparent resin having a refractive index η2 0.9 to 1.1 times the refractive index η1 of the first transparent resin. Have.

In the first and second methods for manufacturing a stereoscopic image forming apparatus, the tip of the convex stripe (or the first and second convex stripes) having the triangular section and the groove (or the first and second grooves having the triangular section). It is preferable that first and second minute flat surfaces are provided on the bottom of each groove. Here, the width w1 of the first minute flat portion is in the range of 0.01 to 0.2 times the pitch p at which the metal reflection surface is formed, and the width w2 of the second minute flat portion is , And preferably in the range of 0.01 to 0.3 times the pitch p.

In the method for manufacturing a stereoscopic image forming apparatus according to the first and second aspects, the second transparent resin is any one of an ultraviolet curing type, a thermosetting type, a two-component curing type, and a room temperature curing type. Is preferred.

Further, in the method for manufacturing a stereoscopic image forming apparatus according to the first and second aspects, it is preferable that the inclined surface is recessed with respect to a virtual plane connecting the upper end and the lower end of the inclined surface.

Further, in the method for manufacturing a stereoscopic image forming apparatus according to the first and second aspects, the ratio (h / p) of the height h of the metal reflection surface to the pitch p of the metal reflection surface is 0.8 to 5. Is preferably in the range.

  In the method for manufacturing a stereoscopic image forming apparatus according to the first and second aspects, the metal reflecting surface is formed on the vertical surface such that the inclined surface becomes a shadow from a direction along the inclined surface. It is preferably carried out by sputtering, vapor deposition of metal, spraying of fine metal particles, or irradiation of an ion beam. Further, when metal plating (metal vapor deposition) is performed on the inclined surface and the vertical surface, the metal plating on the inclined surface can be removed by laser or chemicals. In the above invention, it is preferable that the metal vapor deposition is performed only on the vertical surface, but when the metal reflecting surface is also formed on the minute flat surface portion formed at the tip of the ridge, it is preferable to remove it by post-treatment. .

The method for manufacturing a stereoscopic image forming apparatus and the stereoscopic image forming apparatus according to the first and second aspects of the invention use a molding base material manufactured by any one of press molding, injection molding, and roll molding, and Since a large number of grooves (first and second grooves) formed in the groove have a triangular surface and a triangular surface and are widened on the open side of the groove, the die or the die can be easily released. A stereoscopic image forming apparatus having a relatively high aspect ratio defined by (height) / (width of groove) can be manufactured at low cost. Further, it is possible to suppress or even prevent the generation of rainbow and the distortion of the image due to the difference in the refractive index.
In particular, in the method for manufacturing a stereoscopic image forming apparatus according to the first aspect of the invention, the first and second light control panels are stacked so that the grooves face each other. The reflecting surface approaches, the degree of collection of light from the object is improved, and a clearer image can be obtained.
In the method for manufacturing a stereoscopic image forming apparatus according to the second aspect of the invention, first and second grooves having a triangular cross section and first and second ridges having a triangular cross section are formed on both sides of the plate material. Since the molded base material is manufactured, the first and second grooves and the first and second ridges can be integrally manufactured, which facilitates the manufacturing of the stereoscopic image forming apparatus.

3A and 3B are respectively a front sectional view and a side sectional view of a stereoscopic image forming apparatus manufactured by a method for manufacturing a stereoscopic image forming apparatus according to a first embodiment of the present invention. (A) is a partially enlarged side view of the convex stripes and grooves of the molding base material in the second step of the method for manufacturing the same stereoscopic image forming apparatus, and (B) and (C) are convex shapes of the molding base material according to the modified example, respectively. It is a partially expanded side view of a strip and a groove. (A)-(D) is explanatory drawing of the manufacturing method of the same stereo image forming apparatus. 9A and 9B are respectively a front sectional view and a side sectional view of a stereoscopic image forming apparatus manufactured by a method for manufacturing a stereoscopic image forming apparatus according to a second embodiment of the present invention. (A)-(D) is explanatory drawing of the manufacturing method of the same stereo image forming apparatus.

Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
First, with reference to FIGS. 1A and 1B, a stereoscopic image forming apparatus 10 manufactured by a method for manufacturing a stereoscopic image forming apparatus according to a first embodiment of the present invention will be described.
The stereoscopic image forming apparatus 10 has a pair of first and second light control panels (parallel light reflection panels) 11. In FIGS. 1A and 1B, the first light control panel 11 is arranged on the lower side, and the second light control panel 11 is arranged on the upper side. Since the first light control panel 11 and the second light control panel 11 have the same configuration, they are given the same numbers.

  The first and second light control panels 11 have a gap on one side (front side) (on the upper side of the first light control panel 11 and on the lower side of the second light control panel 11) in a standing state. It is provided with a large number of strip-shaped metal reflection surfaces 13 (mirror surfaces) arranged in parallel. Specifically, each of the first and second light control panels 11 has a vertical surface 14 and an inclined surface (a non-light-reflecting surface that transmits light) on the front side of the plate material (transparent plate material) 12 made of the first transparent resin. A groove 16 having a triangular cross section having a triangular cross section 16 formed by adjacent grooves 16 and a metal reflecting surface 13 is formed on the vertical surface 14 of the groove 16. There is. The grooves 16 and the ridges 17 of the first and second light control panels 11 are provided in parallel at a constant pitch.

The first and second light control panels 11 are in a state where the metal reflection surfaces 13 are arranged orthogonally in a plan view (for example, a state where the metal reflection surfaces 13 are crossed in a range of 85 to 95 degrees, more preferably 88 to 92 degrees). (Including), the grooves 16 are faced to each other and are joined and integrated. An adhesive 18 made of a second transparent resin is arranged between the first light control panel 11 and the second light control panel 11 facing each other, and the inside of the groove 16 is filled with the adhesive 18. It is filled (filled).
In addition, in FIGS. 1A and 1B, the upper surface of the ridge 17 of the first light control panel 11 and the lower surface of the ridge 17 of the second light control panel 11 are separated by a space S (for example, Although a state in which they are close to each other with a value exceeding 0 and about 5 mm or less is shown, they may be in a state of being in contact with each other (there is no gap: 0 mm). The space 18 is also filled with the adhesive 18 (the space S is the layer thickness of the adhesive 18).

The first transparent resin forming the shapes of the first and second light control panels 11 and the second transparent resin serving as the adhesive 18 filling the groove 16 are the same type of resin having high transparency. However, different types of transparent resins having high transparency may be used.
Examples of the first transparent resin include, for example, ZEONEX (registered trademark, glass transition temperature: 120 to 160 ° C., refractive index η1: 1.535, cyclone, which is a thermoplastic resin having a higher melting point than the second transparent resin. Olefin polymers) can be used. Moreover, as the second transparent resin, for example, ZEONOR (ZEONOR: registered trademark, glass transition temperature: 100 to 102 ° C., refractive index η2: 1.53, cycloolefin polymer) can be used.
Here, when the same type of thermoplastic resin is used for the first and second transparent resins, since the melting points are the same, it is possible to melt between the first light control panel 11 and the second light control panel 11. The second transparent resin in the state is poured. At this time, the first transparent resin in the contact portion of the first and second light control panels 11 with the second transparent resin may be partially softened (melted). Since the two transparent resins are mixed at the boundary portion, for example, it is possible to average the refractive index and increase the bonding force between the first transparent resin and the second transparent resin.

Further, when different types of transparent resins are used for the first and second transparent resins, it is preferable that the refractive indices are the same or similar. That is, a refractive index η2 that is the same as or substantially equal to the refractive index η1 of the first transparent resin (for example, a range of ± 10%, that is, a range of (0.9 to 1.1) × η1, and preferably a lower limit of 0.95. A second transparent resin having xη1 and an upper limit of 1.05 × η1) can be used.
Here, as a method of matching the refractive index of the second transparent resin with the refractive index of the first transparent resin forming the first and second light control panels 11, for example, two or more different resins are used. There is a method of mixing and adjusting the refractive index (the refractive index of the first transparent resin can be adjusted by the same method).
The adhesive 18 made of the second transparent resin is an ultraviolet curable type (for example, urethane (meth) acrylate, (meth) acrylate having a polyisoprene skeleton, (meth) acrylate having a polybutadiene skeleton, or (meth) acrylate monomer). (Meth) acrylate, etc., a thermosetting type, a two-component curing type, and a room temperature curing type. Further, for example, thermoplastic resins such as polymethylmethacrylate (PMMA: acrylic resin), amorphous fluororesin, cycloolefin polymer (COP), optical polycarbonate, fluorene polyester, and polyethersulfone can be used (first). The same applies to transparent resin).

In the first and second light control panels 11, where t is the thickness of the plate material 12 and h is the height of the metal reflection surface 13 (the ridges 17), for example, t / h is in the range of 0.5 to 10. Is preferred. Here, it is practical that (t + h) is in the range of 0.5 to 5 mm and h is in the range of 0.03 to 3 mm, for example, but the present invention is not limited to this numerical value.
The angle θ1 between the metal reflection surface 13 (vertical surface 14) and the inclined surface 15 is preferably in the range of 15 to 60 degrees (preferably the upper limit is 45 degrees), but it depends on the thickness t and the height h. Can be changed.
Further, the aspect ratio (h / p), which is the ratio of the height h of the metal reflecting surface 13 to the pitch (width of the groove 16) p of the metal reflecting surface 13, is 0.8 to 5 (preferably, the lower limit is 2 and the upper limit). Is preferably in the range of 3.5), whereby a metal reflecting surface 13 having a higher height can be obtained.

The first and second minute flat surface portions 19 and 20 are respectively provided at the corners (the tip and the top) of the ridge 17 having an acute angle of the triangular section and the corners (bottom) of the groove 16 having the acute angle of the triangular section. Is provided.
The width w1 of the first minute flat surface portion 19 is in the range of 0.01 to 0.2 times (preferably the lower limit is 0.02 times) the pitch p at which the metal reflecting surface 13 is formed, and The width w2 of the second minute flat surface portion 20 is in the range of 0.01 to 0.3 times (preferably the lower limit is 0.02 times and the upper limit is 0.2 times) the pitch p described above, and w2 ≧ It is preferably w1.
By providing the first and second minute flat portions 19 and 20, the product is less likely to be scratched and the product accuracy is further improved. In this embodiment, since the widths of the first and second minute flat surface portions 19 and 20 are small, they are ignored, and the cross-sectional shapes of the groove 16 and the ridge 17 are described as a triangular cross-section (the following embodiments). Is also the same).

As shown in FIG. 2A, the metal reflecting surface 13 is formed by selectively performing a mirror surface treatment on a vertical surface 14 of a groove 16 of a molding base material (described later) 21 formed of a first transparent resin. Has been formed.
The mirror surface treatment is performed such that the inclined surface 15 is shaded from the direction along the inclined surface 15 and the vertical surface 14 is sputtered, metal evaporated, sprayed with metal fine particles, or irradiated with an ion beam (hereinafter, these are It may be referred to as "sputtering etc."). A metal having a high reflectance (for example, Ag (silver), Al (aluminum), Ni (nickel), Ti (titanium), Cr (chrome), etc. is used for this mirror surface treatment, and the vertical surface 14 The surface of the formed metal coating 25 becomes the metal reflection surface 13.
This makes it possible to prevent the mirror surface from being formed on the inclined surface 15 of the groove 16 as much as possible, and to selectively form the mirror surface on the vertical surface 14 of the groove 16.

On the other hand, the inclined surface 15 may be the transparent molding base material 21 as it is and has a uniform flat surface with good light transmittance. However, in manufacturing the molding base material 21 to be described later, in order to reduce the die-cutting resistance, It is preferable to perform a satin treatment (an example of demolding surface treatment) of forming a plurality of irregularities (dimples) on the inclined surface 15.
The inclined surface 15 is a flat surface as shown in FIG. 2 (A), but as shown in FIGS. 2 (B) and 2 (C), the inclined surfaces 22 and 23 are formed on the upper first minute flat surface. It may be configured by a concave surface that connects the groove side end (upper end) of the portion 19 and the vertical surface side end (lower end) of the lower second minute flat surface portion 20 and that is recessed with respect to the virtual flat surface 24. . Specifically, it is as follows.
The inclined surface 22 shown in FIG. 2B is configured by a curved surface having a curved cross section or an arc shape.
The inclined surface 23 shown in FIG. 2C is composed of a flat surface formed on the upper side and a curved surface (curved section or arc shape) formed on the lower side and connected to the flat surface.

The inclined surface is not limited to the above-mentioned shape as long as it is a concave surface. For example, the inclined surface may be composed of two or more flat surfaces. In this case, the angle formed by adjacent flat surfaces is 180 degrees. It is also possible to configure so as to be less than (for example, 120 to 175 degrees, preferably a lower limit of 150 degrees and an upper limit of 170 degrees).
As a result, as shown in FIG. 2A, the vertical surface 14 is formed along the inclined surface 15 at an angle (for example, θ1 + (1 to 10 degrees)) that exceeds the sectional inclination angle θ1 of the planar inclined surface 15. It is possible to further prevent the mirror surface from being formed on the inclined surface 15 and to selectively form the mirror surface on the vertical surface 14 of the groove 16 by sputtering or the like (FIG. 2 (B), ( The same applies to C)). Therefore, the amount of depression of the inclined surface 15 with respect to the virtual plane 24 can be variously changed according to conditions such as sputtering.

As a result, in FIGS. 1A and 1B, the lights L1 and L2 from the object obliquely incident from the lower left side of the stereoscopic image forming apparatus 10 are P1 and P2 of the lower metal reflecting surface 13. And then reflected by Q1 and Q2 of the upper metal reflection surface 13 to form a stereoscopic image on the upper side of the stereoscopic image forming apparatus 10. In this embodiment, the back side of the metal coating 25 formed on the vertical surface 14 by mirror finishing (the left side in FIGS. 1A and 1B) is the metal reflection of the first and second light control panels 11. Although used as the surface 13, the front side of the metal coating 25 (right side in FIGS. 1A and 1B) can also be used as the metal reflecting surface.
In the operation of the three-dimensional image forming apparatus 10, when the light enters the plate material 12 from the air and when the light exits from the plate material 12 into the air, a refraction phenomenon of light and, in some cases, a total reflection phenomenon occur. In consideration, it is necessary to use the stereoscopic image forming apparatus 10 (the same applies to the following embodiments). In addition, the inclined surface 15 is a light passing surface as it is.

  Subsequently, a method of manufacturing the stereoscopic image forming apparatus 10 according to the first embodiment of the present invention will be described with reference to FIGS. 3A to 3D, but manufacturing of the first light control panel 11 will be described. Since the method and the method of manufacturing the second light control panel 11 are the same, the method of manufacturing the first light control panel 11 will be mainly described.

(First step)
As shown in FIG. 3A, on the front side of the plate member 12, a groove 16 having a triangular cross section having an inclined surface 15 and a vertical surface 14 and a ridge 17 having a triangular cross section formed by adjacent grooves 16 are parallel to each other. The placed molding base material 21 made of the first transparent resin is manufactured by any one of press molding, injection molding, and roll molding. As the first transparent resin forming the molding base material 21, it is preferable to use any one of an ultraviolet curable type, a thermosetting type, a two-component curable type, and a room temperature curable type. Thermoplastic resins such as amorphous fluororesins, cycloolefin polymers, optical polycarbonates, fluorene polyesters, and polyethersulfones can also be used.

The dimensions of the molding base material 21 are substantially the same as the dimensions of the first and second light control panels 11, but as described above, since the groove 16 is tapered outward, it is further inclined. Since the surface 15 is subjected to the satin finish, the mold release property is good, and the long vertical surface 14 can be easily obtained. As a method of performing the satin treatment on the inclined surface 15, there is a method of forming a plurality of irregularities on the contact surface of the mold for manufacturing the molding base material 21 with the inclined surface 15.
Furthermore, it is preferable that the molding base material 21 be subjected to an annealing treatment for removing the residual stress generated at the time of molding. This annealing treatment is performed, for example, by placing the molding base material 21 in an electric furnace, a hot air dryer, or a hot water tank (heating solvent) for a predetermined time (the same applies to the following examples).

(Second step)
As shown in FIGS. 2A and 3B, the vertical surface 14 is selectively made into a mirror surface (metal reflection surface 13) by, for example, sputtering.
Here, spattering means that an inert gas (mainly argon) is introduced in a vacuum, a negative voltage is applied to the target to cause glow discharge, and the inert gas is ionized (or not ionized). At high speed, in the atomic state, gas ions collide with the surface of the target to eject metal particles of the film-forming material (eg, Ag, Al, Ni, etc.) that composes the target, and vigorously force the substrate (here, the vertical surface). 14) It is a technique of adhering to and depositing.

At this time, the gas flow 26 is sputtered toward the vertical surface 14 along the inclined surface 15 (from the direction along the inclined surface 15 (a specific direction)) and with the inclined surface 15 in the shadow ( When the metal particles are sprayed), the film-forming material hardly adheres to the inclined surface 15 and adheres to the vertical surface 14. In particular, the smaller the angle θ1 of the inclined surface 15 is, and the more the inclined surfaces 22 and 23 shown in FIGS. 2B and 2C are adopted, the better the selective adhesion efficiency is.
In the mirror surface treatment, instead of sputtering, metal deposition, metal fine particle spraying, or ion beam irradiation is used to perform metal irradiation from a specific direction to form a metal film 25 on the vertical surface 14. The metal reflection surface 13 can also be used.
As a result, the metal coating (metal reflection film) 25 is formed on the surface of the vertical surface 14, the surface becomes the metal reflection surface 13, and the first light control panel 11 is obtained (the same applies to the second light control panel 11). ).

(Third step)
As shown in FIG. 3C, the first light control panel 11 manufactured through the first step and the second step is arranged on the support base 27 with the groove 16 opened upward. The adhesive 18 made of the second transparent resin is placed on the first light control panel 11. The adhesive 18 is liquid (jelly-like).
It is preferable to use any one of an ultraviolet curable type, a thermosetting type, a two-component curable type, and a room temperature curable type as the adhesive 18, and polymethyl methacrylate, an amorphous fluororesin, a cycloolefin polymer. Thermoplastic resins such as optical polycarbonate, fluorene-based polyester, and polyether sulfone can also be used.

Subsequently, the second light control panel 11 is arranged on the first light control panel 11 so that the grooves 16 face each other in a state where the respective metal reflection surfaces 13 are arranged orthogonally in plan view.
Then, in the deaerated state (a reduced pressure state, further a vacuum state), the second light control panel 11 is pressed against the first light control panel 11 by the press 28, and the first and second light control panels 11 are pressed. The groove 16 is filled with the adhesive 18 (the groove 16 is filled with the adhesive 18), and the first and second light control panels 11 are joined.
As described above, by performing the joining operation of the first and second light control panels 11 in the deaerated state, it is possible to prevent bubbles from being generated inside. It is also possible to add (vibrate) vibration such as ultrasonic waves during the joining of the first and second light control panels 11 to remove the bubbles generated inside.

The adhesive 18 may be a plate-shaped (sheet-shaped) one made of a thermoplastic resin.
In this case, first, the plate-like adhesive 18 is placed on the first light control panel 11, and then the second light control panel 11 is placed on the adhesive 18. Next, in the deaerated state, at least the adhesive 18 is heated and softened (further melted) while pressing the second light control panel 11 against the first light control panel 11 with the press 28 to form the groove. After filling 16 with adhesive 18, it is cooled.
Further, in the deaerated state, the adhesive 18 can be injected between the first light control panel 11 and the second light control panel 11 which are arranged to face each other with the grooves 16 facing each other. In this case, the part other than the injection part of the adhesive 18 is sealed.
As a result, the stereoscopic image forming apparatus 10 shown in FIG. 3D is completed.

Next, with reference to FIGS. 4A and 4B, a stereoscopic image forming apparatus 30 manufactured by the method for manufacturing a stereoscopic image forming apparatus according to the second embodiment of the present invention will be described. The same members as those of the stereoscopic image forming apparatus 10 described above are designated by the same reference numerals, and detailed description thereof will be omitted.
The above-described stereoscopic image forming apparatus 10 is formed by manufacturing the first and second light control panels 11 separately and stacking them with the grooves 16 facing each other. On the other hand, in this stereoscopic image forming apparatus 30, grooves 32, 33 and ridges 34, 35 formed on the front and back sides (both sides) of a plate material (transparent plate material) 31 made of a first transparent resin are provided in a mold (illustrated). It is formed by being integrally molded by (do not).

  The stereoscopic image forming apparatus 30 includes a groove (first groove) 32 having a triangular cross section having a vertical surface 36 and an inclined surface 37, and an adjacent groove 32 on the front side (one side) of a plate material 31 located in the center. The ridges (first ridges) 34 having a triangular section are formed in parallel, and grooves (second section) having a vertical surface 38 and an inclined surface 39 are arranged on the back side (other side) of the plate member 31. (Grooves) 33 and ridges (second ridges) 35 having a triangular cross-section formed by adjacent grooves 33 have a molding base material 40 made of a first transparent resin and arranged in parallel. .

The groove 32 formed on the front side of the plate material 31 and the groove 33 formed on the back side of the plate material 31 are orthogonal to each other in plan view (for example, intersect in a range of 85 to 95 degrees, more preferably 88 to 92 degrees). (Including the state).
The grooves 32 and 33 have the same configuration as the groove 16 of the three-dimensional image forming apparatus 10, and the ridges 34 and 35 have the same configuration as the ridge 17 of the three-dimensional image forming apparatus 10. The metal reflection surface 13 is formed on the vertical surfaces 36 and 38 of the grooves 32 and 33.
If the height of the metal reflection surface 13 is h1, the thickness T of the plate material 31 is preferably in the range of, for example, 0.5 × h1 to 3 × h1 (further, the upper limit is 1 × h1). Further, the aspect ratio (h1 / p) of the height h1 of the metal reflection surface 13 to the pitch p of the metal reflection surface 13 is preferably in the range of 0.8 to 5.

The insides of the grooves 32 and 33 are filled (filled) with a filler 18a made of a second transparent resin (the same component as the adhesive 18 described above). The surface of the filler (filler) 18a that fills the grooves 32 and 33 may be left as it is without any particular treatment, or may be ground (polished) after being cured, if necessary.
Further, a transparent flat plate made of, for example, a first transparent resin or a second transparent resin can be arranged on the surface of the filling material 18a. The transparent flat plate may be in contact with the tops of the ridges 34 and 35 (first minute flat surface portions 19), or may have a gap with the tops of the ridges 34 and 35.
As described above, when the transparent flat plate is arranged on the surface of the filling material 18a, the three-dimensional image forming apparatus can be reinforced, and thus the thickness T of the plate material 31 can be further reduced, which is preferable.

  Subsequently, a method of manufacturing the stereoscopic image forming apparatus 30 according to the second embodiment of the present invention will be described with reference to FIGS. 5A to 5D, but according to the first embodiment described above. Detailed description of parts similar to those of the method for manufacturing the stereoscopic image forming apparatus 10 will be omitted.

(First step)
As shown in FIG. 5 (A), grooves 32, 33 having a triangular cross section, and ridges 34, 35 having a triangular cross section formed by adjacent grooves 32, 33 are formed on both sides of the plate 31, respectively, and the plate material A molding base material 40 in which grooves 32 and 33 respectively formed on both sides of 31 are arranged orthogonally in plan view is manufactured by any one method of press molding, injection molding, and roll molding.
The molding base material 40 is formed of the first transparent resin similarly to the molding base material 21 of the stereoscopic image forming apparatus 10 described above.

(Second step)
As shown in FIG. 5B, the vertical surface 36 is selectively made into a mirror surface (metal reflection surface 13) by, for example, sputtering. Specifically, the gas flow 26 is sputtered toward the vertical surface 36 along the inclined surface 37 (from the direction (specific direction) along the inclined surface 37) and with the inclined surface 37 in the shadow. Do the ring. The vertical surface 38 is also mirror-finished by the same method.
Instead of sputtering, vapor deposition of metal, spraying of fine metal particles, or irradiation with an ion beam can also be used for this mirror surface treatment.
As a result, the metal coating (metal reflection film) 25 is formed on the surface of the vertical surface 36, and the surface becomes the metal reflection surface 13, and the stereoscopic image forming apparatus main body 41 is obtained (the same applies to the vertical surface 38).

(Third step)
As shown in FIG. 5C, the filler 18a made of the second transparent resin described above is placed on the stereoscopic image forming apparatus main body 41, and the groove 32 is filled with the filler 18a and cured. Then, the stereoscopic image forming apparatus main body 41 is inverted, the filler 18a made of the second transparent resin is placed on the stereoscopic image forming apparatus main body 41, and the groove 33 is filled with the filler 18a and cured. Let
The filler 18a used is liquid (jelly-like).
Here, the filling of the filler 18a into the grooves 32 and 33 is preferably performed in a deaerated state. Further, when the filler 18a is filled into the grooves 32 and 33 (or after the filling), it is preferable to perform a flattening process. This flattening treatment includes pressing, pressing, molding with a die, cutting or polishing, and disposing a transparent flat plate on the liquid filler 18a.
As a result, a flat plate-shaped stereoscopic image forming apparatus 30 having a flat exposed surface as shown in FIG. 5D is obtained.

  Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the configurations described in the above embodiments, and within the scope of matters described in the claims. It also includes other possible embodiments and variations. For example, the case where the method for manufacturing a stereoscopic image forming apparatus of the present invention is configured by combining some or all of the above-described respective embodiments and modifications is also included in the scope of the present invention.

  The method for manufacturing a stereoscopic image forming apparatus according to the present invention can easily and inexpensively manufacture a stereoscopic image forming apparatus having a relatively high aspect ratio. As a result, the stereoscopic image forming apparatus can be effectively used in devices that require images (for example, medical devices, home appliances, automobiles, aircrafts, ships, etc.).

10: Stereoscopic image forming device, 11: First and second light control panels, 12: Plate material, 13: Metal reflection surface, 14: Vertical surface, 15: Inclined surface, 16: Groove, 17: Convex line, 18 : Adhesive, 18a: Filler, 19: First minute flat surface portion, 20: Second minute flat surface portion, 21: Molding base material, 22, 23: Inclined surface, 24: Virtual flat surface, 25: Metal coating, 26: gas flow, 27: support, 28: press, 30: three-dimensional image forming device, 31: plate material, 32, 33: groove, 34, 35: ridge, 36: vertical surface, 37: inclined surface, 38: vertical surface, 39: inclined surface, 40: molded base material, 41: stereoscopic image forming apparatus main body

Claims (5)

On the front side of the plate material made of the first transparent resin, a molding base material in which a groove having a triangular cross section having an inclined surface and a vertical surface, and convex ridges having a triangular cross section formed by the adjacent grooves are arranged in parallel, A first step of manufacturing by a method of any one of press molding, injection molding, and roll molding;
A second step of selectively forming a metal reflective surface on the vertical surface of the groove;
In the first and second light control panels respectively manufactured through the first step and the second step, the grooves are opposed to each other in a state where the metal reflection surfaces are arranged orthogonally in plan view, and The groove of the first and second light control panels is filled with a second transparent resin having a refractive index η2 0.9 to 1.1 times the refractive index η1 of the first transparent resin, a second light control panel have a third step of joining degassed state,
The method for manufacturing a stereoscopic image forming apparatus, wherein the melting point of the first transparent resin is higher than the melting point of the second transparent resin .   The method for manufacturing a stereoscopic image forming apparatus according to claim 1, wherein the first light control panel is on the bottom and the second light control panel is on the top. The second transparent resin is placed, and the second light control panel is pressed against the first light control panel by a press to press the second light control panel into the groove of the first and second light control panels. A method for manufacturing a three-dimensional image forming apparatus, characterized in that the transparent resin is filled. The method for manufacturing a stereoscopic image forming apparatus according to claim 1 or 2 , wherein the second transparent resin is any one of an ultraviolet curable type, a thermosetting type, a two-component curable type, and a room temperature curable type. A method for manufacturing a characteristic stereoscopic image forming apparatus. The method for manufacturing a stereoscopic image forming apparatus according to claim 1, wherein the metal reflection surface is selectively formed on the vertical surface of the groove in the second step. So as to be the shadow of the convex stripe from the direction along the inclined surface toward the vertical surface by sputtering, metal deposition, spraying of metal fine particles, or irradiation with an ion beam. Method of manufacturing stereoscopic image forming apparatus. Each of the metal reflection surfaces is orthogonal to the first and second light control panels in which a plurality of metal reflection surfaces are formed in parallel in a standing state with a space on each side. A three-dimensional image forming apparatus that is superposed in the state of
The first and second light control panels are formed of a first synthetic resin and have a molding base material having a groove having a triangular cross-section having an inclined surface and a vertical surface on one side, and the molding base material formed on the vertical surface. Having a metal reflecting surface and a second transparent resin filled in the groove,
The melting point of the first transparent resin is higher than the melting point of the second transparent resin, and the second transparent resin has a refractive index η2 of 0.9 to 1.1 times the refractive index η1 of the first transparent resin. And the height h of the metal reflection surface is in the range of 0.8 to 5 times the pitch p of the metal reflection surface .

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