JP2017181854A - Method for manufacturing imaging element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an imaging element capable of suppressing generation of distortion in a mirror image.SOLUTION: A method for manufacturing an imaging element 1 comprises: a joining step of forming a combined reflective element 100 by joining unit reflective elements 10A to 10E in a surface direction; and a step of superposing another combined reflective element 200 on the combined reflective element 100. When viewing along a thickness direction, the unit reflective element 10B has a substantial parallelogram outer shape. The outer shape of the unit reflective element 10B includes a joined surface extending in a parallel direction with respect to a plurality of reflection surfaces 11 provided in the unit reflective element 10B. The unit reflective element 10C is joined to a joined surface of the unit reflective element 10B so that the plurality of reflection surfaces 11 provided in the unit reflective surfaces 10B and 10 C become parallel to each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing an imaging element, and more particularly to a method for manufacturing an imaging element used in an aerial image display device that enables display of an aerial image.

  The aerial image display device includes an imaging element and can display an aerial image. The imaging element forms a real image (mirror image) of an object arranged at a spatial position on one surface side at a spatial position on the other surface side. As a configuration example of the imaging element, there is one that can display an aerial image by having a configuration in which two composite reflection elements are stacked in the thickness direction (see Patent Documents 1 to 3).

  The composite reflective element having such a configuration can have a large area by connecting (tiling) a plurality of unit reflective elements in the surface direction. Compared to the case where an imaging element is configured by enlarging one unit reflecting element, a large composite reflecting element is configured by tiling a plurality of unit reflecting elements, and an imaging element is formed using a large composite reflecting element. Manufacturing costs are easier when manufacturing a child.

  Each of the plurality of unit reflection elements constituting the composite reflection element includes a plurality of reflection surfaces and a plurality of transparent bodies, and these are alternately stacked in a direction orthogonal to the surface of the element. The two composite reflective elements are overlapped with each other so that a plurality of reflective surfaces provided on one composite reflective element and a plurality of reflective surfaces provided on the other composite reflective element are orthogonal to each other.

JP2013-167670A International Publication No. 2012/133403 JP2013-101230A

  The unit reflecting element has a configuration in which a plurality of reflecting surfaces and a plurality of transparent bodies are alternately stacked. For example, in a plan view (in other words, when the unit reflection element is viewed from a direction parallel to the thickness direction), the unit reflection element having a quadrangular outer shape is in the direction in which a plurality of reflection surfaces extend. A pair of end surfaces (hereinafter referred to as first end surfaces) extending in parallel directions, and a pair of end surfaces (hereinafter referred to as second end surfaces) extending in a direction intersecting the direction in which the plurality of reflecting surfaces extend. doing.

  The two unit reflecting elements are connected (tiled) so as to be adjacent to each other in the surface direction, and a method called reflection surface bonding for bonding the first end surfaces to each other and a laminated surface bonding for bonding the second end surfaces to each other. There is a method called.

  The joint between the first end surfaces formed when the reflective surface bonding is performed has a shape extending in a direction parallel to the reflective surface. Although this junction can function as a reflection surface with respect to incident light, since this junction extends in a direction parallel to the reflection surface provided in the unit reflection element, the existence of this junction is Inconspicuous. Further, since it is easy to join the reflecting surfaces between adjacent unit reflecting elements so that they are parallel to each other, there is almost no distortion in the mirror image due to the presence of the joining portion.

  On the other hand, the joint portion between the second end surfaces formed when the laminated surface joining is performed has a shape extending in a direction intersecting (here, orthogonal) to the reflecting surface provided in the unit reflecting element. Have. The presence of the joint portion extending in the direction intersecting with the reflection surface provided in the unit reflection element functions as a reflection surface with respect to the incident light, so that the presence of the joint portion becomes conspicuous. In addition, since it is difficult to join the reflecting surfaces between adjacent unit reflecting elements so as to be parallel to each other, the presence of the joining portion may cause partial distortion in the mirror image.

  The present invention includes an image forming element that includes a composite reflecting element configured by joining a plurality of unit reflecting elements in a plane direction, and can suppress partial distortion in a mirror image as compared with the related art. It aims at providing the manufacturing method of.

  An imaging element manufacturing method according to the present invention is a method for manufacturing an imaging element that forms a real image of an object arranged in a space on one surface side in a space on the other surface side, and has a flat plate shape. And a step of preparing a plurality of transparent plates having a reflective surface on at least one of the front surface and the back surface, and stacking the plurality of transparent plates and bonding them together to form a laminate block A step of forming a unit reflection element having a flat shape by cutting the laminate block along the lamination direction, and the unit reflection element and other unit reflection elements. The unit reflection element comprising: a bonding step of forming a composite reflection element by bonding in a plane direction; and a step of superimposing the composite reflection element and another composite reflection element, and constituting the composite reflection element Is the above along the thickness direction When the lateral reflection element is viewed, it has a substantially parallelogram outer shape, and the outer shape of the unit reflection element is a surface to be joined that extends in a direction parallel to the plurality of reflection surfaces. And the other unit reflection elements are arranged so that the plurality of reflection surfaces provided on the unit reflection element and the plurality of reflection surfaces provided on the other unit reflection elements are parallel to each other. The unit reflection element is bonded to the surface to be bonded.

  Preferably in the manufacturing method, in the stacking step, the stacked body block is formed by stacking a plurality of the transparent plates having the same size, in a direction corresponding to the thickness direction of the unit reflection element. When the laminated body block is viewed along, the laminated body block produced by carrying out the laminating step has a substantially parallelogram outer shape.

  Preferably in the manufacturing method, the manufacturing method further includes a side surface processing step of cutting the first side surface and the second side surface of the laminate block located on opposite sides in the surface direction, and in a direction corresponding to the thickness direction of the unit reflective element. When the laminate block is viewed along, the laminate block obtained by performing the side surface processing step has a substantially parallelogram outer shape.

  Preferably, in the manufacturing method, the other unit reflection element has a triangular outer shape when the other unit reflection element is viewed along the thickness direction.

  Preferably, in the manufacturing method, the plurality of transparent plates constitute a plurality of transparent bodies by cutting the laminated body block in the cutting step, and the plurality of transparent bodies constituting the unit reflection element. Includes the first transparent body and the second transparent body that are adjacent to each other through the reflective surface, and the first transparent body and the second transparent body have a rectangular parallelepiped shape, In the direction parallel to the reflecting surface, the first transparent body has a protruding portion that protrudes outward from the end of the second transparent body, and the reflection is reflected on the surface of the protruding portion. A mask having an antireflection function and / or a corrosion prevention function is provided on the reflection surface provided on the surface of the protruding portion.

  Preferably, in the manufacturing method, the plurality of transparent plates constitute a plurality of transparent bodies by cutting the laminated body block in the cutting step, and the plurality of transparent bodies constituting the unit reflection element. When these transparent bodies are viewed along the thickness direction, each has a parallelogram outer shape.

  Preferably, in the manufacturing method, the composite reflective element and the other composite reflective element have a substantially rectangular outer shape when viewed in the thickness direction.

  Preferably, in the manufacturing method, all of the unit reflection elements including the unit reflection element and the other unit reflection element and bonded in a plane direction to form the composite reflection element are a plurality of the reflection surfaces. A plurality of first outer peripheral end surfaces extending in a direction parallel to the plurality of reflection surfaces, and a plurality of second outer peripheral end surfaces extending in a direction intersecting with the plurality of reflection surfaces. With respect to all the unit reflection elements bonded in the plane direction for the configuration, each of the unit reflection elements is arranged such that the second outer peripheral end surface is not bonded to another unit reflection element.

  By constructing a composite reflective element using unit reflective elements having a substantially parallelogram-shaped outer shape, it is possible to suppress the occurrence of partial distortion in a mirror image as compared with the conventional art.

FIG. 3 is a plan view showing imaging element 1 in the first embodiment. It is arrow sectional drawing along the II-II line | wire shown in FIG. It is arrow sectional drawing along the III-III line | wire shown in FIG. FIG. 3 is an exploded perspective view showing the imaging element 1 in the first embodiment. 3 is an exploded plan view showing a first composite reflective element 100 provided in the imaging element 1 according to Embodiment 1. FIG. FIG. 3 is a conceptual diagram illustrating a mechanism for displaying an aerial image by using the imaging element 1 in the first embodiment. FIG. 6 is a diagram (front view) illustrating a preparation process of the method for manufacturing the imaging element 1 according to the first embodiment. 6 is a perspective view showing a stacking step (and side surface processing step) of the method for manufacturing imaging element 1 in the first embodiment. FIG. 6 is a perspective view showing a cutting step of the method for manufacturing the imaging element 1 according to Embodiment 1. FIG. 6 is a perspective view showing another lamination process of the method for manufacturing imaging element 1 in Embodiment 1. FIG. FIG. 10 is a perspective view showing another cutting process of the method for manufacturing imaging element 1 in the first embodiment. 6 is a plan view showing a joining step of the method for manufacturing imaging element 1 in Embodiment 1. FIG. 6 is a plan view showing a first composite reflective element 100 obtained by performing a joining step of the method for manufacturing imaging element 1 in Embodiment 1. FIG. 12 is a perspective view for explaining a method of manufacturing an imaging element in Comparative Example 1. FIG. 12 is a perspective view for explaining a method of manufacturing an imaging element in Comparative Example 2. FIG. FIG. 6 is a perspective view for explaining the imaging element manufacturing method (cutting step) in the first embodiment. 12 is a plan view showing a first composite reflective element 102 provided in an imaging element in Comparative Example 3. FIG. 10 is a plan view showing a first composite reflective element 103 provided in an imaging element in Comparative Example 4. FIG. 10 is a plan view showing a first composite reflective element 104 provided in an imaging element in Comparative Example 5. FIG. 10 is a plan view showing a first composite reflective element 105 provided in an imaging element in Comparative Example 6. FIG. 6 is a plan view showing a first composite reflective element 106 provided in the imaging element in Embodiment 2. FIG. FIG. 10 is a perspective view showing a stacking step (and side surface processing step) of the imaging element manufacturing method according to Embodiment 3. It is a figure (front view) which shows the preparation process and lamination process of the manufacturing method of the image formation element in Embodiment 4. FIG. 10 is a perspective view showing a cutting step in the method for manufacturing an imaging element in the fourth embodiment. FIG. 10 is a perspective view showing a first composite reflective element 107 provided in an imaging element in a fifth embodiment. FIG. 10 is a perspective view showing a preparation step and a lamination step in an imaging element manufacturing method according to Embodiment 5. FIG. 10 is a perspective view showing a mask coating process of the imaging element manufacturing method according to the fifth embodiment. It is a perspective view which shows the unit reflective element 10B obtained by implementing the cutting process of the manufacturing method of the image formation element in Embodiment 5. FIG. FIG. 10 is a perspective view showing a joining step in the method for manufacturing an imaging element in the fifth embodiment. FIG. 10 is a perspective view showing a process of superimposing a first composite reflective element 107 and a second composite reflective element 207 in the imaging element manufacturing method according to Embodiment 5.

  Hereinafter, embodiments will be described with reference to the drawings. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

[Embodiment 1]
(Imaging element 1)
FIG. 1 is a plan view showing an imaging element 1 in the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. The imaging element 1 includes a first composite reflective element 100 (composite reflective element), a second composite reflective element 200 (other composite reflective elements), and a translucent adhesive layer 300, and has a flat plate shape as a whole.

(First composite reflective element 100)
The first composite reflective element 100 is formed in a flat plate shape as a whole and has an outer main surface 100a and an inner main surface 100b (see FIGS. 2 and 3). When the first composite reflective element 100 is viewed along the thickness direction, the first composite reflective element 100 has a substantially rectangular outer shape. The concept of a substantially rectangular outer shape includes a rectangular outer shape in which each of the four sides is constituted by a straight line. Although details will be described later, the rectangular outer shape referred to here is compared with the outer shape of the first composite reflective element 107 shown in FIG. 25 described later.

  The first composite reflective element 107 shown in FIG. 25 has four sides composed of lines that bend in a step shape when the first composite reflective element 107 is viewed along the thickness direction. The substantially rectangular external shape is not limited to the external shape of the first composite reflective element 100 as shown in FIGS. 1 and 4, but also includes the external shape of the first composite reflective element 107 shown in FIG. 25. It is a concept.

  The first composite reflective element 100 of the present embodiment includes a plurality of unit reflective elements 10A to 10E and an adhesive layer 13 positioned between the unit reflective elements 10A to 10E. The adhesive layer 13 (adhesive) joins the ends of adjacent unit reflective elements among the unit reflective elements 10A to 10E. The unit reflecting elements 10A to 10E are joined in the surface direction by the adhesive layer 13, and the first composite reflecting element 100 constitutes one composite reflecting element that is enlarged as a whole.

  Each of the unit reflecting elements 10A to 10E constituting the first composite reflecting element 100 has a plurality of reflecting surfaces 11 and a plurality of transparent bodies 12 (in FIG. 1, the reflecting surface 11 is indicated by a broken line). . The plurality of reflecting surfaces 11 and the plurality of transparent bodies 12 are formed to be parallel to each other and alternately arranged. Each of the plurality of transparent bodies 12 is located between two adjacent reflecting surfaces 11. In the unit reflecting elements 10B to 10D, each of the plurality of transparent bodies 12 has a parallelogram outline when viewed from the plurality of transparent bodies 12 along the thickness direction of the unit reflecting elements 10B to 10D. It has a shape (see FIG. 4).

(Second composite reflective element 200)
The second composite reflective element 200 is formed in a flat plate shape as a whole and has an outer main surface 200a and an inner main surface 200b (see FIGS. 2 and 3). When the first composite reflective element 100 is viewed along the thickness direction, the first composite reflective element 100 has a substantially rectangular (in this case, rectangular) outer shape. When the second composite reflective element 200 is viewed along the thickness direction, the second composite reflective element 200 has a substantially rectangular (here, rectangular) outer shape having the same size as the first composite reflective element 100. Yes.

  The second composite reflective element 200 includes a plurality of unit reflective elements 20A to 20E and an adhesive layer 23 located between the unit reflective elements 20A to 20E. The adhesive layer 23 (adhesive) joins the ends of adjacent unit reflective elements among the unit reflective elements 20A to 20E. The unit reflection elements 20A to 20E are joined in the surface direction by the adhesive layer 23, and the second composite reflection element 200 constitutes one composite reflection element that is enlarged as a whole.

  Each of the unit reflecting elements 20A to 20E constituting the second composite reflecting element 200 has a plurality of reflecting surfaces 21 and a plurality of transparent bodies 22 (in FIG. 1, the reflecting surface 21 is indicated by a solid line). The plurality of reflecting surfaces 21 and the plurality of transparent bodies 22 are formed to be parallel to each other and alternately arranged. Each of the plurality of transparent bodies 22 is located between two adjacent reflecting surfaces 21. In the unit reflecting elements 20B to 20D, each of the plurality of transparent bodies 22 has a parallelogram-shaped outer shape when the plurality of transparent bodies 22 are viewed along the thickness direction of the unit reflecting elements 20B to 20D. It has a shape (see FIG. 4).

(Translucent adhesive layer 300)
As shown in FIGS. 2 and 3, the first composite reflective element 100 and the second composite reflective element 200 are arranged so that the inner main surfaces 100b and 200b face each other, and overlap each other in the thickness direction. The first composite reflective element 100 and the second composite reflective element 200 are superposed such that the reflective surface 11 and the reflective surface 21 included in each are orthogonal to each other (see FIG. 4).

  The translucent adhesive layer 300 is provided between the first composite reflective element 100 and the second composite reflective element 200, and joins the first composite reflective element 100 and the second composite reflective element 200. In a state where the first composite reflective element 100 and the second composite reflective element 200 are bonded to each other, the first main surface 1a (one surface) of the imaging element 1 is formed by the outer main surface 100a of the first composite reflective element 100. The second main surface 1b (the other surface) of the imaging element 1 is configured by the outer main surface 200a of the second composite reflective element 200.

  When the material of each member described above is exemplified, the reflecting surfaces 11 and 21 are made of metal such as aluminum or silver, and the transparent bodies 12 and 22 are made of glass or transparent resin. The adhesive layers 13 and 23 are composed of a cured product of an epoxy adhesive. The translucent adhesive layer 300 is also composed of a cured product of an epoxy adhesive. As the epoxy adhesive, a two-component adhesive can be used.

(Detailed configuration of unit reflection elements 10A, 10E, 20A, and 20E)
FIG. 4 is an exploded perspective view showing the imaging element 1. FIG. 5 is an exploded plan view showing the first composite reflective element 100 provided in the imaging element 1. Since the unit reflecting elements 10A, 10E, 20A, and 20E have the same configuration, the unit reflecting element 10A will be mainly described below. The description of the unit reflection elements 10E, 20A, and 20E will not be repeated for the portions that overlap with the description of the unit reflection element 10A.

  4 and 5, unit reflecting element 10A is joined so as to be adjacent to unit reflecting element 10B in the plane direction. Similarly, the unit reflection elements 10E, 20A, and 20E are joined so as to be adjacent to the unit reflection elements 10D, 20B, and 20D in the plane direction. The unit reflecting elements 10A, 10E, 20A, 20E all have a triangular outer shape when the unit reflecting elements 10A, 10E, 20A, 20E are viewed along the thickness direction.

  As shown in FIG. 5, the outer shape of the unit reflecting element 10A includes a bottom side 10u and side sides 10t and 10v. The base 10u extends in a direction parallel to the plurality of reflecting surfaces 11 provided in the unit reflecting element 10A. The inner angle between the side sides 10t and 10v is 90 °. Each of the side edges 10t and 10v has a linear shape, and the unit reflecting element 10A has an outer shape of a triangle (here, a right isosceles triangle) when the unit reflecting element 10A is viewed along the thickness direction. have.

(Detailed configuration of unit reflection elements 10B to 10D, 20B to 20D)
As shown in FIG. 4, the unit reflection elements 10B to 10D and 20B to 20D have the same configuration. The unit reflecting elements 10B to 10D and 20B to 20D all have a substantially parallelogram outer shape when the unit reflecting elements 10B to 10D and 20B to 20D are viewed along the thickness direction.

  As shown in FIG. 5, the outer shape of the unit reflective element 10B includes a first side 10p, a second side 10q, a third side 10r, and a fourth side 10s (hereinafter, the first side 10p, the second side 10q, (The third side 10r and the fourth side 10s are also referred to as a side 10p, a side 10q, a side 10r, and a side 10s, respectively).

  The sides 10p and 10r extend in a direction intersecting the plurality of reflection surfaces 11 provided in the unit reflection element 10B. The side 10q connects one ends of the sides 10p and 10r, and the side 10s connects the other ends of the sides 10p and 10r. The sides 10q and 10s extend in a direction parallel to the plurality of reflection surfaces 11 provided in the unit reflection element 10B. The length of the side 10q of the unit reflection element 10B is substantially equal to the length of the bottom side 10u of the unit reflection element 10A.

  In the present embodiment, all of the sides 10p, 10q, 10r, and 10s have a linear shape, and the unit reflection element 10B has parallel four sides when the unit reflection element 10B is viewed along the thickness direction. The outer shape of the shape. The concept of a substantially parallelogram outer shape includes a parallelogram outer shape. Although details will be described later, the external shape of the parallelogram referred to here is compared with the external shape of the unit reflecting element 10B shown in FIG.

  In the unit reflecting element 10B shown in FIG. 25, the sides 10q and 10s extend in a direction parallel to the plurality of reflecting surfaces 11 provided in the unit reflecting element 10B. The side 10p connects one ends of the sides 10q and 10s, and the side 10r connects the other ends of the sides 10q and 10s. In the unit reflecting element 10B shown in FIG. 25, the sides 10p and 10r both have a shape that bends in a staircase pattern. The outline shape of the substantially parallelogram is not limited to the outline shape of the parallelogram, and is a concept that includes the external shape of the unit reflecting element 10B shown in FIG.

  The unit reflecting element 10B and the unit reflecting element 10A are joined so as to be adjacent to each other in the surface direction. In the case where the unit reflection element 10B corresponds to the first unit reflection element, for example, the unit reflection element 10A corresponds to the second unit reflection element. In this case, the unit reflection element 10B has a substantially parallelogram (parallelogram) outer shape, and the unit reflection element 10B has an outer shape with respect to the plurality of reflection surfaces 11 provided in the unit reflection element 10B. It includes a surface to be joined (side 10q) extending in a parallel direction. That is, the surface to be joined here is constituted by the side 10q. On the other hand, the unit reflecting element 10A has a triangular outer shape when the unit reflecting element 10A is viewed along the thickness direction. The unit reflection element 10A (base 10u) is configured so that the plurality of reflection surfaces 11 provided on the unit reflection element 10B and the plurality of reflection surfaces 11 provided on the unit reflection element 10A are parallel to each other. To the surface to be joined (side 10q). Such a relationship is also established between the unit reflection element 10D (first unit reflection element) and the unit reflection element 10E (second unit reflection element). Such a relationship is also established between the unit reflection element 20B (first unit reflection element) and the unit reflection element 20A (second unit reflection element). Such a relationship is also established between the unit reflection element 20D (first unit reflection element) and the unit reflection element 20E (second unit reflection element).

  The unit reflecting element 10B and the unit reflecting element 10C are joined so as to be adjacent to each other in the surface direction. In the case where the unit reflection element 10B corresponds to the first unit reflection element, the unit reflection element 10C can also correspond to the second unit reflection element. In this case, the outer shape of the unit reflecting element 10B includes a surface to be joined (side 10s) extending in a direction parallel to the plurality of reflecting surfaces 11 provided in the unit reflecting element 10B. That is, the surface to be joined here is constituted by the side 10s. On the other hand, the unit reflecting element 10C has an outer shape of a substantially parallelogram (parallelogram) when the unit reflecting element 10C is viewed along the thickness direction. The unit reflection element 10C (side 10q) is arranged so that the plurality of reflection surfaces 11 provided on the unit reflection element 10B and the plurality of reflection surfaces 11 provided on the unit reflection element 10C are parallel to each other. To the surface to be joined (side 10s). Such a relationship is also established between the unit reflection element 10C (first unit reflection element) and the unit reflection element 10D (second unit reflection element). Such a relationship is also established between the unit reflection element 20B (first unit reflection element) and the unit reflection element 20C (second unit reflection element). Such a relationship is also established between the unit reflection element 20C (first unit reflection element) and the unit reflection element 20D (second unit reflection element).

  With reference to FIGS. 4 and 5, the plurality of unit reflection elements 10 </ b> A to 10 </ b> E joined in the surface direction to constitute the first composite reflection element 100 extend in a direction parallel to the plurality of reflection surfaces 11. A plurality of first outer peripheral end faces, and a plurality of second outer peripheral end faces extending in a direction intersecting with the plurality of reflecting surfaces 11. In the present embodiment, the plurality of first outer peripheral end surfaces extending in the direction parallel to the plurality of reflecting surfaces 11 are the bottom side 10u of the unit reflecting elements 10A and 10E and the unit reflecting elements 10B, 10C and 10D. Side 10q, 10s. The plurality of second outer peripheral end surfaces extending in the direction intersecting with the plurality of reflecting surfaces 11 include the side edges 10v and 10t of the unit reflecting elements 10A and 10E, and the sides 10p of the unit reflecting elements 10B, 10C and 10D, 10r. In the present embodiment, for all the unit reflecting elements 10A to 10E joined in the surface direction, each unit reflecting element 10A to 10E has a second outer peripheral end face (side edges 10v and 10t and sides 10p and 10r). These are arranged so as not to be joined to another unit reflection element. The same applies to the plurality of unit reflection elements 20 </ b> A to 20 </ b> E joined in the surface direction to form the second composite reflection element 200.

(A mechanism for displaying aerial images)
FIG. 6 is a conceptual diagram showing a mechanism for displaying an aerial image by using the imaging element 1. In order to display an aerial image using the imaging element 1, an object 301 as a projection object is disposed in the space on the first main surface 1 a side of the imaging element 1. The light emitted from the object 301 in a different direction enters the first composite reflective element 100 via the first main surface 1a of the imaging element 1 (the outer main surface 100a of the first composite reflective element 100). The light is reflected by the reflective surface 11 (see FIGS. 1 to 4) located in front of the light traveling direction, and reaches the translucent adhesive layer 300 via the inner main surface 100 b of the first composite reflective element 100.

  The light that has passed through the translucent adhesive layer 300 enters the second composite reflective element 200 via the inner main surface 200b of the second composite reflective element 200, and is a reflective surface that is positioned in front of the traveling direction of the light. 21, and reaches the outside of the imaging element 1 via the second main surface 1 b (the outer main surface 200 a of the second composite reflecting element 200) of the imaging element 1. The light emitted to the outside of the imaging element 1 is reflected at the symmetrical position of the object 301 with respect to the plane on which the imaging element 1 is arranged, by retroreflection in the first composite reflection element 100 and the second composite reflection element 200. As a result, the mirror image 302 (real image) of the object 301 is imaged in the space on the second principal surface 1 b side of the imaging element 1.

  For example, when a liquid crystal display is arranged as the object 301, an image displayed on the liquid crystal display is displayed as an aerial image. The object 301 is not limited to a liquid crystal display, and any object may be arranged regardless of two-dimensional or three-dimensional types.

(Method of manufacturing imaging element 1)
(Preparation process)
Referring to FIG. 7, first, transparent plates 12a to 12e having a flat shape are prepared. A coating layer (reflective surface 11) is formed on at least one of the front and back surfaces of each of the transparent plates 12a to 12e. In the present embodiment, the coating layer is formed on both the front surface and the back surface of each of the transparent plates 12a to 12e.

  The transparent plates 12a to 12e constitute the transparent body 12 or the transparent body 22 described above, and glass or transparent resin can be suitably used here. As a specific example, a sheet glass D263 (refractive index of 1.532) manufactured by Schott can be used. A coating layer comprises the reflective surface 11 or the reflective surface 21 mentioned above, and an aluminum film or a silver film can be utilized suitably here. The coating film can be formed by sputtering, for example.

(Lamination process)
Next, for example, an epoxy-based adhesive is applied on one exposed surface of the transparent plates 12a to 12e (that is, the surface of one coating layer) whose both main surfaces are covered with the coating layer, and the transparent plates 12a to 12e are applied. 12e is overlaid and the adhesive is cured. Thereby, the transparent plates 12a to 12e are joined to each other. By repeating the joining operation as many times as necessary, a plurality of transparent plates 12a to 12e, whose main surfaces are covered with the coating layer, are laminated via an adhesive to form one laminate block 50a (FIG. 8). Is done.

  Referring to FIG. 8, in the stacking process of the present embodiment, stacked body block 50 a is formed by stacking a plurality of transparent plates 12 a to 12 e having the same size. The plurality of transparent plates 12a to 12e have the same thickness H10 in the thickness direction, and are the same in the direction corresponding to the thickness direction of the unit reflection element (see the unit reflection element 10B shown in FIG. 9). It has a width W10. Furthermore, in the direction orthogonal to the two directions of the direction corresponding to the thickness direction of the unit reflection element and the thickness direction of the transparent plate, the plurality of transparent plates 12a to 12e have the same length L10. Yes.

  The plurality of transparent plates 12a to 12e are positioned on the same plane when the end surfaces 53 and 54 in the direction corresponding to the thickness direction of the unit reflection element (see the unit reflection element 10B shown in FIG. 9) are stacked. Approximately aligned. The end surfaces 53 and 54 referred to here are the end surface 53 located on the front side of the paper surface of FIGS. 7 and 8 or the end surface 54 located on the back side of the paper surface of FIGS.

  On the other hand, the plurality of transparent plates 12a to 12e are stacked while being shifted obliquely in the length direction (the direction of the length L10). Therefore, when the laminated body block 50a is viewed along the direction corresponding to the thickness direction of the unit reflecting element, the laminated body block 50a produced by the implementation of the lamination process has a thickness H50 (between the side 10q and the side 10s). And a substantially parallelogram-shaped outer shape having a value corresponding to a distance).

(Side processing process)
After the stacked body block 50a is formed, the first side surface 51 and the second side surface 52 located on the opposite sides in the surface direction of the stacked body block 50a are cut obliquely along the planes indicated by the dotted lines LL1 and LL2. At this time, wire cutting can be used. Thereby, the laminated body block 50b (refer FIG. 9) is obtained. When the multilayer body block 50b is viewed along the direction corresponding to the thickness direction of the unit reflective element (see the unit reflective element 10B shown in FIG. 9), the multilayer body block 50b obtained by performing the side surface processing step. Has an outer shape of a substantially parallelogram (here, a parallelogram).

(Cutting process)
Referring to FIG. 9, thereafter, laminated body block 50b is cut along the lamination direction (plane indicated by dotted line LL3) of transparent plates 12a to 12e. The laminated body block 50b is cut thinly so that the outer shape of the member cut out from the laminated body block 50b (here, the unit reflective element 10B) is a flat plate.

  Next, the cut surface of the cut member (here, the unit reflecting element 10B) is polished. Through the above steps, the unit reflection element 10B and the unit reflection elements 10C, 10D, 20B, 20C, and 20D having the same configuration are obtained.

  Referring to FIG. 10, in order to prepare unit reflection element 10A having a triangular shape, a plurality of transparent plates 12m having a flat shape are prepared. A coating layer (reflection surface 11) is formed on at least one of the front and back surfaces of the transparent plate 12m. In the present embodiment, the coating layer is formed on both the front surface and the back surface of the transparent plate 12m.

  Next, the plurality of transparent plates 12m are overlapped and joined to each other with an adhesive. By repeating the joining operation as many times as necessary, one stacked body block 50c (FIG. 10) is formed. Here, one laminated body block 50c is formed from a plurality of transparent plates 12m having the same size. Thereafter, the stacked body block 50c is cut along a diagonal line (a plane indicated by dotted lines LL4 and LL5). Thereby, the laminated body block 50d (refer FIG. 11) is obtained.

  Referring to FIG. 11, thereafter, laminated body block 50d is cut along the lamination direction (plane indicated by dotted line LL6) of transparent plate 12m. The cut surface of the cut member (here, the unit reflecting element 10A) is polished. Through the above steps, the unit reflection element 10A and the unit reflection elements 10E, 20A, and 20E having the same configuration are obtained.

  In the above-described method, in order to produce the unit reflecting elements 10B, 10C, 10D, 20B, 20C, and 20D having a substantially parallelogram (parallelogram) outer shape, the plurality of transparent plates 12a to 12a having the same size are used. The layers 12e are stacked obliquely and then cut. In order to produce 10B having a substantially parallelogram (parallelogram) outer shape, a plurality of transparent plates having the same size are laminated without shifting, and a laminate block (similar to the laminate block 50c). 10B or the like having a substantially parallelogram (parallelogram) outer shape may be produced by cutting out from the above.

(Joining process)
Referring to FIGS. 12 and 13, unit reflecting elements 10 </ b> A to 10 </ b> E manufactured through the above steps are arranged on a surface plate (not shown) so as to be adjacent to each other in the surface direction. An adhesive (adhesive layer 13) is supplied between adjacent unit reflection elements among the unit reflection elements 10A to 10E, and these are bonded in the surface direction. Thereby, the 1st composite reflective element 100 shown in FIG. 13 is obtained. The second composite reflective element 200 can also be obtained by a similar method.

  With reference to FIG. 13, the length L10m in the horizontal direction of the first composite reflective element 100 obtained as described above is, for example, 1000 mm, and the length L10n in the vertical direction is, for example, 250 mm. The length L10k of the side 10v of the unit reflecting elements 10A, 10E and the length L10k of the sides 10p, 10r of the unit reflecting elements 10B, 10C, 10D are, for example, 250 mm and the same value. The thickness H50 (height) of the unit reflecting elements 10A to 10E is, for example, 177 mm and the same value.

  Finally, the first composite reflective element 100 and the second composite reflective element 200 are joined by the translucent adhesive layer 300, whereby the imaging element 1 is obtained (see FIG. 4).

(Function and effect)
As described at the beginning, there are generally two methods for connecting (tiling) two unit reflecting elements so as to be adjacent to each other in the surface direction, and there are a method called reflective surface bonding and a method called laminated surface bonding. . In the first composite reflective element 100 of the present embodiment, the unit reflection having a substantially parallelogram outer shape in plan view (in other words, when the unit reflective element is viewed from a direction parallel to the thickness direction). Elements 10B, 10C, and 10D and unit reflection elements 10A and 10E having a triangular outer shape are used.

  The external shapes of the unit reflecting elements 10B, 10C, and 10D are a pair of end surfaces (sides 10q and 10s) extending in a direction parallel to the direction in which the plurality of reflecting surfaces 11 extend, and the direction in which the plurality of reflecting surfaces 11 extend. And a pair of end faces (sides 10p, 10r) extending in a direction intersecting with. Each of the unit reflecting elements 10A and 10E includes a base 10u extending in a direction parallel to a direction in which the plurality of reflecting surfaces 11 extend, and a pair of end surfaces extending in a direction intersecting the direction in which the plurality of reflecting surfaces 11 extend ( Side side 10t, side side 10v).

  In the present embodiment, all the unit reflection elements 10A to 10E are bonded to each other by reflection surface bonding. All of the bonding portions (bonded surfaces) between the adjacent unit reflection elements among the unit reflection elements 10 </ b> A to 10 </ b> E have shapes extending in a direction parallel to the reflection surface 11. Although these junction parts can function as a reflective surface with respect to incident light, these junction parts are reflective surfaces provided in each of the unit reflective elements 10A to 10E constituting the first composite reflective element 100. 11 extends in a direction parallel to 11, so that there is almost no distortion in the mirror image due to the presence of these joints. The same applies to the unit reflection elements 20A to 20E constituting the second composite reflection element 200.

  In the present embodiment, by utilizing the unit reflecting elements 10B, 10C, 10D having a parallelogram outer shape and the unit reflecting elements 10A, 10E having a right isosceles triangle outer shape, a substantially rectangular shape ( The first composite reflective element 100 having a rectangular outer shape can be easily manufactured. The same applies to the unit reflection elements 20A to 20E constituting the second composite reflection element 200.

  Hereinafter, the operation and effect of manufacturing the first composite reflective element 100 using the unit reflective elements 10B, 10C, and 10D having the outer shape of a substantially parallelogram (parallelogram) will be compared with a plurality of comparative examples. However, it explains in more detail.

[Comparative Example 1]
Referring to FIG. 14, when it is considered to manufacture the first composite reflective element 101 having a rectangular outer shape, it is also possible to arrange four unit reflective elements 10V in 2 rows and 2 columns (here. (Only three unit reflecting elements 10V are shown in the figure). Each of the four unit reflection elements 10V has a rectangular outer shape.

  However, when the four unit reflection elements 10V are arranged in 2 rows and 2 columns, the end faces 10va and 10va can be joined by reflection surface joining, but the end faces 10vb and 10vb are joined by laminated surface joining. Will be. The joint portion between the end faces 10vb and 10vb has a shape extending in a direction intersecting (or orthogonally intersecting with) the reflecting surface 11 provided in the unit reflecting element 10V. The presence of a joint extending in a direction intersecting with the reflecting surface 11 provided in the unit reflecting element 10V functions as a reflecting surface with respect to incident light, thereby causing partial distortion in the mirror image. It can be a cause.

[Comparative Example 2]
Referring to FIG. 15, when considering the production of the first composite reflective element having a rectangular outer shape, it is conceivable that the first composite reflective element is produced by cutting out from the large laminate block 50 w. In the first composite reflective element 100 in the first embodiment, for example, the lateral length L10m is, for example, 1000 mm, and the longitudinal length L10n is, for example, 250 mm.

  When it is going to obtain the 1st composite reflective element of the same magnitude | size as the 1st composite reflective element 100, as for the magnitude | size of the laminated body block 50w, L10mxW10xL10n will be 1000 mmx250mmx250mm. In order to cut such a large laminate block 50w (particularly in the range of 1000 mm × 250 mm) by wire cutting, a very large processing device is required, and the manufacturing cost is extremely increased.

  Referring to FIG. 16, on the other hand, in the above-described first embodiment, laminated body block 50a is prepared. As for the size of the laminated body block 50a, H50 × W10 × L10 is 177 mm × 250 mm × 354 mm. A processing device (especially a processing device for cutting a range of 177 mm × 250 mm) necessary for cutting the laminated body block 50a by wire cutting can be prepared at a low cost, and the manufacturing cost is hardly increased. .

[Comparative Example 3]
Referring to FIG. 17, when considering the production of the first composite reflective element 102 having a rectangular outer shape, it is conceivable to use a total of two unit reflecting elements 10 </ b> W having a rectangular outer shape. The length L20n of the unit reflecting element 10W is, for example, 500 mm. The processing apparatus for producing the unit reflection element 10W by wire cutting can be smaller than that of the above-described comparative example 2 (FIG. 15).

  However, in the first composite reflective element 102, laminated surface joining is performed in order to join two adjacent unit reflecting elements 10W, and the reflecting surface 11 provided on the two unit reflecting elements 10W is attached to the reflecting face 11 provided on the two unit reflecting elements 10W. The presence of the joint extending in the direction intersecting the surface functions as a reflecting surface with respect to incident light, so that the presence of the joint becomes conspicuous. In addition, since it is difficult to join the reflecting surfaces between adjacent unit reflecting elements so as to be parallel to each other, the presence of the joining portion may cause partial distortion in the mirror image.

[Comparative Example 4]
Referring to FIG. 18, when considering the production of the first composite reflective element 103 having a rectangular outer shape, it is conceivable to use a total of four unit reflecting elements 10 </ b> X having a square outer shape. The length L10k of the unit reflecting element 10X is, for example, 250 mm. A processing apparatus for producing the unit reflection element 10X by wire cutting can be smaller than the above-described comparative example 3 (FIG. 17).

  However, in the first composite reflective element 103, laminated surface joining is performed in order to join adjacent unit reflective elements 10X and 10X, and the reflective surface 11 provided on the unit reflective elements 10X and 10X. The presence of the joint extending in the intersecting direction functions as a reflection surface with respect to incident light, so that the presence of the joint becomes conspicuous. In addition, since it is difficult to join the reflecting surfaces between adjacent unit reflecting elements so as to be parallel to each other, the presence of the joining portion may cause partial distortion in the mirror image.

[Comparative Example 5]
Referring to FIG. 19, when considering the production of the first composite reflective element 104 having a rectangular outer shape, it is conceivable to use a total of eight unit reflecting elements 10Y1 and 10Y2 having a triangular outer shape. . In the first composite reflective element 104, the bases of the adjacent unit reflective elements 10Y1 and 10Y2 are joined to each other by reflective surface joining, and these joint parts are provided in the unit reflective elements 10Y1 and 10Y2. Since it extends in a direction parallel to the reflecting surface 11, the presence of the joint is not noticeable. Further, since it is easy to join the reflecting surfaces between adjacent unit reflecting elements so that they are parallel to each other, there is almost no distortion in the mirror image due to the presence of these joining portions.

  However, the side edges of the adjacent unit reflection elements 10Y1 and 10Y2 are bonded to each other by laminated surface bonding, and a joint portion extending in a direction intersecting the reflection surface 11 provided in the unit reflection elements 10Y1 and 10Y2. Existence of the junction functions as a reflection surface with respect to the incident light, so that the presence of the joint becomes conspicuous. In addition, since it is difficult to join the reflecting surfaces between adjacent unit reflecting elements so as to be parallel to each other, the presence of the joining portion may cause partial distortion in the mirror image.

[Comparative Example 6]
Referring to FIG. 20, when considering the production of the first composite reflective element 105 having a rectangular outer shape, it is conceivable to use a total of 16 unit reflective elements 10Z1 to 10Z4 having a triangular outer shape. . In the first composite reflective element 105, the side edges of the adjacent unit reflective elements 10Z1 and 10Y3 are joined to each other by reflective surface joining. The side edges of the adjacent unit reflection elements 10Z2 and 10Y4 are also bonded to each other by reflection surface bonding. Since these junctions extend in a direction parallel to the reflection surface 11 provided in the unit reflection elements 10Z1 to 10Z4, the existence of the junctions is not noticeable. Further, since it is easy to join the reflecting surfaces between adjacent unit reflecting elements so that they are parallel to each other, there is almost no distortion in the mirror image due to the presence of these joining portions.

  However, the side edges of the adjacent unit reflection elements 10Z1 and 10Z2 are joined to each other by laminated surface joining. The side edges of the adjacent unit reflecting elements 10Z3 and 10Z4 are also joined to each other by laminated surface joining. The side edges of the adjacent unit reflection elements 10Z1 and 10Z4 are also joined to each other by laminated surface joining. The presence of the joint portion extending in the direction intersecting with the reflection surface 11 provided in the unit reflection elements 10Z1 to 10Z4 functions as a reflection surface with respect to incident light, so that the presence of the joint portion becomes conspicuous. In addition, since it is difficult to join the reflecting surfaces between adjacent unit reflecting elements so as to be parallel to each other, the presence of the joining portion may cause partial distortion in the mirror image.

  For the above Comparative Examples 1 to 6, in the above-described first embodiment, the laminated body block 50a (FIGS. 8 and 16) is prepared, and the size of the laminated body block 50a is H50 × W10 × L10. 177 mm × 250 mm × 354 mm. A processing device (especially a processing device for cutting a range of 177 mm × 250 mm) necessary for cutting the laminated body block 50a by wire cutting can be prepared at a low cost, and the manufacturing cost is hardly increased. . Further, by utilizing the unit reflecting elements 10B, 10C, and 10D having a parallelogram outer shape and the unit reflecting elements 10A and 10E having a right isosceles triangle outer shape, the first shape having a rectangular outer shape is obtained. The composite reflective element 100 can be easily manufactured. The same applies to the unit reflection elements 20A to 20E constituting the second composite reflection element 200.

[Embodiment 2]
Referring to FIG. 21, in the above-described first embodiment, three unit reflecting elements 10B, 10C, and 10D having a parallelogram outline and two units having a right isosceles triangle outline are shown. By using the reflective elements 10A and 10E, the first composite reflective element 100 having a rectangular outer shape is manufactured.

  As shown in FIG. 21, two unit reflection elements 10B and 10C having a parallelogram outer shape and two unit reflection elements 10A and 10E having a right isosceles triangle outer shape are utilized. Alternatively, the first composite reflective element 106 having a rectangular outer shape may be produced. In the first composite reflective element 106, the horizontal length L10p is, for example, 600 mm, and the vertical length L10q is, for example, 200 mm. The length L10j of the side 10v of the unit reflecting elements 10A and 10E and the length L10j of the sides 10p and 10r of the unit reflecting elements 10B and 10C are, for example, the same value of 200 mm. The unit reflecting elements 10A and 10E and the unit reflecting elements 10B and 10C can be manufactured by cutting a laminated body block having a thickness H51 (= 141 mm).

[Embodiment 3]
With reference to FIG. 22, the manufacturing method of the imaging element in Embodiment 3 is demonstrated. FIG. 22 is a perspective view showing a stacking step (and side surface processing step) of the imaging element manufacturing method according to the third embodiment. In the manufacturing method in Embodiment 1 described above, a plurality of transparent plates 12a to 12e having the same size are obliquely formed in order to produce the unit reflecting element 10B having a substantially parallelogram (parallelogram) outer shape. The layers are shifted and then cut (see FIGS. 7 to 9).

  As shown in FIG. 22, in order to produce 10B having a substantially parallelogram (parallelogram) outer shape, a plurality of transparent plates 12a to 12e having the same size are laminated without being shifted. The body block 50e may be produced. By performing the side surface processing on the multilayer body block 50e, the first side surface 51 and the second side surface 52 located on the opposite sides in the surface direction of the multilayer body block 50e are inclined along the planes indicated by the dotted lines LL1 and LL2. It is shaved. Thereafter, similarly to the case of FIG. 9, 10B or the like having a substantially parallelogram (parallelogram) outer shape may be cut out from the laminated body block.

[Embodiment 4]
With reference to FIG. 23 and FIG. 24, the manufacturing method of the imaging element in Embodiment 4 is demonstrated. In the first embodiment described above (FIGS. 7 to 9), after the stacked body block 50a is formed, the first side surface 51 and the second side surface 52 of the stacked body block 50a are indicated by dotted lines LL1 and LL2 (FIG. 8). Is cut obliquely along the plane shown in FIG.

  As shown in FIG. 23, in the preparation step, transparent plates 12a to 12e in which end portions 12t and 12u form inclined surfaces may be prepared. The inclined surface may be formed by molding or may be formed by cutting.

  Referring to FIG. 24, a plurality of transparent plates 12a to 12e are stacked via an adhesive, whereby a stacked body block 50f having the same shape as the stacked body block 50b (FIG. 9) in the first embodiment. Can be formed.

[Embodiment 5]
With reference to FIGS. 25 to 30, imaging element 1 </ b> A (FIG. 30) and the manufacturing method thereof according to Embodiment 5 will be described. In the imaging element 1A, the first composite reflective element 107 (FIGS. 25 and 30) and the second composite reflective element 207 (FIG. 31) are used.

  When the first composite reflective element 107 shown in FIG. 25 is viewed along the thickness direction, the first composite reflective element 107 has four sides composed of lines bent in a staircase shape, and has a substantially rectangular outer shape as a whole. Have. The first composite reflective element 107 includes unit reflective elements 10M, 10B, and 10N joined in the plane direction. When the unit reflection elements 10M and 10N are viewed along the thickness direction, the unit reflection elements 10M and 10N both have a substantially trapezoidal outer shape, and the unit reflection element 10B is unit reflected along the thickness direction. When the element 10B is viewed, it has a substantially parallelogram outer shape.

  The outer shape of the unit reflecting elements 10M and 10N has an upper base 10i, a lower base 10k, a first leg 10j, and a second leg 10h. The upper base 10i and the lower base 10k extend in a direction parallel to the plurality of reflection surfaces 11 provided in the unit reflection elements 10M and 10N. The first leg 10j connects one ends of the upper base 10i and the lower base 10k, and the second leg 10h connects the other ends of the upper base 10i and the lower base 10k. In the unit reflecting elements 10M and 10N, the first leg 10j and the second leg 10h both have a shape that bends in a stepped manner. The length of the lower base 10k is substantially equal to the lengths of the sides 10q and 10s of the unit reflecting element 10B.

  The outer shape of the unit reflection element 10B has sides 10p, 10q, 10r, and 10s. The sides 10q and 10s extend in a direction parallel to the plurality of reflection surfaces 11 provided in the unit reflection element 10B. The side 10r connects one ends of the sides 10q and 10s, and the side 10p connects the other ends of the sides 10q and 10s. In the unit reflecting element 10B, the sides 10p and 10r both have a shape that bends in a staircase pattern.

  The plurality of transparent bodies 12 constituting the unit reflective element 10B include a first transparent body and a second transparent body (for example, transparent bodies 12M and 12N) that are adjacent to each other via the reflective surface 11. These transparent bodies 12M and 12N have a rectangular parallelepiped shape, and the transparent body 12M (first transparent body) and the transparent body 12N (second transparent body) have the same length. . In a direction parallel to the reflecting surface 11, the transparent body 12M has a protruding portion 17 that protrudes outward from the end of the transparent body 12N. The transparent body 12N also has a protruding portion 17 that protrudes outward from the end of the transparent body 12M. The reflection surface 11 is provided on the surface of the protrusion 17, and the reflection surface 11 provided on the surface of the protrusion 17 is covered with a mask 18 having an antireflection function and / or a corrosion prevention function. Yes.

  In the present embodiment, the protruding portion 17 is also provided in the transparent body 12 constituting the unit reflecting elements 10M and 10N. The reflection surface 11 is provided on the surface of the protrusion 17, and the reflection surface 11 provided on the surface of the protrusion 17 is covered with a mask 18 having an antireflection function and / or a corrosion prevention function. Yes. The reflecting surface 11 is made of, for example, an aluminum film or a silver film. When the mask 18 has a corrosion prevention function, the mask 18 can prevent corrosion of the reflecting surface 11. When the mask 18 has an antireflection function, it is possible to prevent unnecessary light from entering the first composite reflective element 108 from the outside of the first composite reflective element 107.

  Also in the 1st composite reflective element 107 which has the above structures, all the unit reflective elements 10M, 10B, and 10N are mutually joined by reflective surface joining. All of the joining portions (joined surfaces) between the adjacent unit reflecting elements among the unit reflecting elements 10M, 10B, and 10N have a shape extending in a direction parallel to the reflecting surface 11. Although these junction parts can function as a reflective surface with respect to incident light, these junction parts are provided in each of the unit reflection elements 10M, 10B, and 10N constituting the first composite reflection element 107. Since it extends in a direction parallel to the reflecting surface 11, the presence of the joint is not noticeable. Further, since it is easy to join the reflecting surfaces between adjacent unit reflecting elements so that they are parallel to each other, there is almost no distortion in the mirror image due to the presence of these joining portions. The same applies to the unit reflection elements 20M, 20B, and 20N constituting the second composite reflection element 207 (FIG. 30).

(Production method)
Referring to FIG. 26, first, transparent plates 12a to 12e having a flat shape are prepared. A coating layer (reflective surface 11) is formed on at least one of the front and back surfaces of each of the transparent plates 12a to 12e. In the present embodiment, the coating layer is formed on both the front surface and the back surface of each of the transparent plates 12a to 12e.

  Next, the transparent plates 12a to 12e are overlapped, and the transparent plates 12a to 12e are joined to each other with an adhesive. Preferably, the plurality of transparent plates 12a to 12e are stacked while being shifted obliquely in the length direction. By repeating the joining operation as many times as necessary, a plurality of transparent plates 12a to 12e whose both principal surfaces are covered with the coating layer are laminated via an adhesive to form one laminated body block 50a (FIG. 26). Is done. When the laminated body block 50a is viewed along the direction corresponding to the thickness direction of the unit reflecting element, the laminated body block 50a produced by the execution of the lamination process has a substantially parallelogram outer shape.

  Referring to FIG. 27, mask 18 may be applied on the surface of the transparent plate 12a-12e corresponding to the protruding portion 17 (mask application step). The mask 18 may be applied before the transparent plates 12a to 12e are laminated, or after the transparent plates 12a to 12e are laminated. Thereafter, the laminated body block 50a is cut along the lamination direction of the transparent plates 12a to 12e (a plane indicated by a dotted line LL3).

  Referring to FIG. 28, the cut surface of the cut member (here, unit reflecting element 10B) is polished. The unit reflection element 10B is obtained through the above steps. Unit reflection elements 10M and 10N are obtained by the same method as described above. When manufacturing the unit reflecting elements 10M and 10N, for example, a plurality of transparent plates having the same size are stacked without shifting and cut out from a stacked body block (similar to the stacked body block 50e shown in FIG. 22). Thus, 10M and 10N having a substantially trapezoidal (trapezoidal) outer shape can be manufactured.

  Referring to FIG. 29, unit reflecting elements 10M, 10B, 10N manufactured through the above steps are arranged on a surface plate (not shown) so as to be adjacent to each other in the surface direction. An adhesive (adhesive layer 13) is supplied between adjacent unit reflecting elements among the unit reflecting elements 10M, 10B, and 10N, and these are bonded in the surface direction. Thereby, the first composite reflective element 107 shown in FIG. 30 is obtained. The second composite reflective element 207 can also be obtained by a similar method. Finally, the first composite reflective element 107 and the second composite reflective element 207 are joined by a translucent adhesive layer (not shown), whereby the imaging element 1A is obtained.

[Other embodiments]
In each of the above-described embodiments, all the unit reflection elements constituting the first composite reflection element and the second composite reflection element are bonded to each other by reflection surface bonding. If necessary, several unit reflection elements constituting the first composite reflection element and the second composite reflection element may be joined by laminated surface bonding. Even in this case, by utilizing a unit reflecting element having a parallelogram outer shape or a unit reflecting element having a substantially parallelogram outer shape, for example, a composite reflecting element having a square or rectangular outer shape, for example. Can be easily manufactured.

  Although a plurality of embodiments have been described above, the above disclosure is illustrative in all respects and not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1, 1A imaging element, 1a first main surface, 1b second main surface, 10A, 10B, 10C, 10D, 10E, 10M, 10N, 10V, 10W, 10X, 10Y1, 10Y2, 10Y3, 10Y4, 10Z1, 10Z2 , 10Z3, 10Z4, 20A, 20B, 20C, 20D, 20E, 20M, 20N Unit reflection element, 10h second leg, 10i upper base, 10j first leg, 10k lower base, 10p first side (side), 10q first 2 side (side), 10r 3rd side (side), 10s 4th side (side), 10t, 10v side side, 10u bottom side, 10va, 10vb, 53, 54 end face, 11, 21 reflective surface, 12, 12M, 12N, 22 transparent body, 12a, 12e, 12m transparent plate, 12t, 12u end, 13, 23 adhesive layer, 17 protrusion, 18 mask, 50a, 50b 50c, 50d, 50e, 50f, 50w Laminate block, 51 1st side surface, 52 2nd side surface, 100, 101, 102, 103, 104, 105, 106, 107, 108 1st composite reflective element, 100a, 200a outside Main surface, 100b, 200b Inner main surface, 200, 207 Second composite reflective element, 300 Translucent adhesive layer, 301 Object, 302 Mirror image, D263 Thin glass, H10, H50, H51 thickness, L10, L10j, L10k, L10m, L10n, L10p, L10q, L20n length, LL1, LL2, LL3, LL4, LL5, LL6 line, W10 width.

Claims (8)

A method for manufacturing an imaging element that forms a real image of an object arranged in a space on one surface side in a space on the other surface side,
A preparatory step of preparing a plurality of transparent plates having a flat shape and provided with a reflective surface on at least one of the front surface and the back surface;
A stacking step of forming a stacked body block by stacking a plurality of the transparent plates and joining together;
A cutting step of forming a unit reflection element having a flat plate shape by cutting the laminate block along the lamination direction;
A joining step of forming a composite reflective element by joining the unit reflective element and another unit reflective element in a plane direction;
A step of superimposing the composite reflective element and another composite reflective element,
The unit reflecting element constituting the composite reflecting element has a substantially parallelogram outer shape when the unit reflecting element is viewed along the thickness direction,
The outer shape of the unit reflection element includes a surface to be bonded that extends in a direction parallel to the plurality of reflection surfaces,
The other unit reflection elements are the unit reflection elements such that the plurality of reflection surfaces provided on the unit reflection element and the plurality of reflection surfaces provided on the other unit reflection elements are parallel to each other. Bonded to the bonded surface of
Manufacturing method of imaging element. In the lamination step, the laminate block is formed by stacking a plurality of the transparent plates having the same size,
When the laminate block is viewed along a direction corresponding to the thickness direction of the unit reflective element, the laminate block produced by the implementation of the laminate step has a substantially parallelogram outer shape. Yes,
The manufacturing method of the imaging element of Claim 1. Further comprising a side surface processing step of cutting the first side surface and the second side surface of the laminate block positioned on opposite sides in the surface direction;
When the laminated body block is viewed along a direction corresponding to the thickness direction of the unit reflective element, the laminated body block obtained by performing the side surface processing step has a substantially parallelogram outer shape. have,
The manufacturing method of the imaging element of Claim 1. The other unit reflection element has a triangular outer shape when the other unit reflection element is viewed along the thickness direction.
The manufacturing method of the imaging element of any one of Claim 1 to 3. The plurality of transparent plates constitute a plurality of transparent bodies by cutting the laminate block in the cutting step,
The plurality of transparent bodies constituting the unit reflective element include the first transparent body and the second transparent body that are adjacent to each other via the reflective surface,
The first transparent body and the second transparent body have a rectangular parallelepiped shape,
In a direction parallel to the reflecting surface, the first transparent body has a protruding portion that protrudes outward from an end portion of the second transparent body,
The reflective surface is provided on the surface of the protruding portion,
On the reflection surface provided on the surface of the protruding portion, a mask having an antireflection function and / or a corrosion prevention function is provided.
The method for manufacturing an imaging element according to claim 1. The plurality of transparent plates constitute a plurality of transparent bodies by cutting the laminate block in the cutting step,
The plurality of transparent bodies constituting the unit reflective element have a parallelogram outer shape when viewed from the plurality of transparent bodies along the thickness direction.
The method for manufacturing an imaging element according to claim 1. The composite reflective element and the other composite reflective element have a substantially rectangular outer shape when viewed along the thickness direction,
The manufacturing method of the imaging element of any one of Claim 1 to 6. All the unit reflection elements that include the unit reflection element and the other unit reflection elements and are bonded in a plane direction to form the composite reflection element are:
A plurality of first outer peripheral end surfaces extending in a direction parallel to the plurality of reflecting surfaces;
A plurality of second outer peripheral end surfaces extending in a direction intersecting with the plurality of reflection surfaces,
For all the unit reflection elements bonded in the surface direction to constitute the composite reflection element, each of the unit reflection elements is arranged such that the second outer peripheral end surface is not bonded to another unit reflection element. ing,
The manufacturing method of the imaging element of any one of Claim 1 to 7.

Images