JP2017009658A - Image formation optical element and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image formation optical element and manufacturing method of the image formation optical element that can obtain high-quality mirror video.SOLUTION: A manufacturing method of an image formation optical element includes steps of: preparing a rectangular parallelepiped block 41 and a second triangle block 61 formed by having an optical reflection part 7 and laminated via a transparent plate material 6; mutually positioning the rectangular parallelepiped block 41 and the second triangle block 61 so that the corresponding optical reflection unit 7 is arranged on the same plane; and mutually bonding the rectangular parallelepiped block 41 and the second triangle block 61. The step of mutually positioning the rectangular parallelepiped block 41 and the second triangle block 61 is configured to include steps of: making light incident from a side of first faces 41a and 61a to detect the light on a side of second faces 41b and 61b, and thereby recognizing a specific transparent plate material 6S in the block; and adjusting positions of the rectangular parallelepiped block 41 and the second triangle block 61 with the specific transparent plate material 6S set as an index.SELECTED DRAWING: Figure 15

Description

  The present invention relates to an imaging optical element and a manufacturing method thereof.

  For example, Japanese Unexamined Patent Application Publication No. 2011-175297 discloses a conventional imaging optical element manufacturing method in an optical imaging apparatus for the purpose of easily forming a stereoscopic image in the air on the side of an observer viewing an object. A method for manufacturing a light control panel to be used is disclosed (Patent Document 1).

  In the method for manufacturing a light control panel disclosed in Patent Document 1, a large number of transparent synthetic resin plates or glass plates having a metal reflection surface formed on one surface are arranged so that the metal reflection surface is arranged on one side. By laminating, a laminate is produced. A plurality of light control panels are obtained by cutting out the laminated body so that a cut surface perpendicular to the metal reflecting surface is formed.

  JP 2013-88556 A aims to improve the brightness of an aerial image by forming a real image of an observation object on one main surface side in a space on the other main surface side. A large reflector array optical device is disclosed (Patent Document 2). The reflector array optical device disclosed in Patent Document 2 includes a plurality of two-sided corner reflector array optical elements that are juxtaposed on the same plane and joined to each other.

JP 2011-175297 A JP 2013-88556 A

  As disclosed in the above-mentioned patent document, as an aerial image device realizing means, an imaging optical element that forms a mirror image of a projection object arranged on one surface side in a spatial position on the other surface side is provided. Are known. The imaging optical element has a plurality of light reflecting portions arranged in parallel, and a reflecting surface for reflecting light from the projection object is formed by these light reflecting portions.

  On the other hand, in such a method for manufacturing an imaging optical element, there is a technique of joining (tiling) a plurality of optical elements for the purpose of obtaining a large imaging optical element. In this case, there is a method in which a plurality of plates are cut out from a laminated block in which the light reflecting portion and the transparent plate material are repeatedly laminated, and these plates are joined to each other. However, the man-hour enlargement and the quality variation are problems. Then, the method of joining the lamination | stacking blocks before cutting out a plate is taken.

  When tiling such laminated blocks, the light corresponding to the laminated blocks to be joined is observed while observing one end face of the laminated block where the end of the light reflecting portion is exposed and the other end face on the opposite side. The mutual positions of the laminated blocks are adjusted so that the reflecting portions are arranged on the same plane. However, since both end faces of the laminated block are separated by, for example, about several hundred mm, there is a risk that position adjustment may be performed using different light reflecting portions as an index between one end face and the other end face of the laminated block. . In this case, the positional relationship (parallel relationship) of the light reflecting portions required between the laminated blocks to be tiled cannot be obtained, and the quality of the mirror image may be deteriorated.

  Accordingly, an object of the present invention is to solve the above-described problems, and to provide an imaging optical element capable of obtaining a high-quality mirror image and a manufacturing method thereof.

  According to one aspect of the present invention, there is provided a method of manufacturing an imaging optical element that forms a mirror image of a projection object arranged on one surface side at a spatial position on the other surface side. Is the method. A method for manufacturing an imaging optical element is provided with a first laminated block and a second laminated block in which light reflecting portions having a planar shape are laminated via a transparent plate, and a plurality of light reflecting portions are arranged in parallel to each other. The process of carrying out is provided. Each of the first laminated block and the second laminated block has a first surface and a second surface that are arranged on the front and back sides, with the ends of the plurality of light reflecting portions exposed. The method of manufacturing the imaging optical element includes the step of positioning the first stacked block and the second stacked block relative to each other so that the corresponding light reflecting portions are arranged on the same plane between the first stacked block and the second stacked block. And joining the mutually positioned first laminated block and second laminated block to each other. The step of positioning the first laminated block and the second laminated block relative to each other includes inputting an electric signal or light from the first surface side and detecting the electric signal or light on the second surface side, Recognizing a specific layer in the second laminated block, and adjusting the positions of the first laminated block and the second laminated block using the specific layer as an index.

  According to the manufacturing method of the imaging optical element configured as described above, the position of the laminated block is adjusted by inputting an electric signal or light from the first surface side and detecting the electric signal or light on the second surface side. A specific layer sometimes used as an index can be accurately recognized on the first surface side and the second surface side. Thereby, the positional relationship of the light reflection part required between the 1st lamination block and the 2nd lamination block can be obtained, and the imaging optical element which can obtain a high quality mirror image can be manufactured.

  Preferably, a plurality of metal reflecting surfaces are formed by the light reflecting portion in the first laminated block and the second laminated block. The step of recognizing a specific layer in the first laminated block and the second laminated block includes inputting an electric signal from the metal reflecting surface on the first surface side and detecting the electric signal on the metal reflecting surface on the second surface side. The step of recognizing a specific metal reflecting surface among the plurality of metal reflecting surfaces is included.

  According to the method of manufacturing an imaging optical element configured as described above, a specific metal reflecting surface as a specific layer can be recognized by causing an electric signal to flow through the metal reflecting surface.

  Preferably, each of the first laminated block and the second laminated block has conductivity, and includes a plurality of adhesive layers for joining the transparent plate members. The step of recognizing a specific layer in the first laminated block and the second laminated block includes inputting an electrical signal from the adhesive layer on the first surface side and detecting the electrical signal on the adhesive layer on the second surface side. And a step of recognizing a specific adhesive layer among the plurality of adhesive layers.

  According to the method of manufacturing an imaging optical element configured as described above, a specific adhesive layer as a specific layer can be recognized by flowing an electric signal through the adhesive layer.

  According to another aspect of the present invention, there is provided a method for manufacturing an imaging optical element, in which a mirror image of a projection object arranged on one surface side is imaged at a spatial position on the other surface side. Is the method. A method for manufacturing an imaging optical element is provided with a first laminated block and a second laminated block in which light reflecting portions having a planar shape are laminated via a transparent plate, and a plurality of light reflecting portions are arranged in parallel to each other. The process of carrying out is provided. Each of the first laminated block and the second laminated block has a first surface and a second surface that are arranged on the front and back sides, with the ends of the plurality of light reflecting portions exposed. The method of manufacturing the imaging optical element includes the step of positioning the first stacked block and the second stacked block relative to each other so that the corresponding light reflecting portions are arranged on the same plane between the first stacked block and the second stacked block. And joining the mutually positioned first laminated block and second laminated block to each other. Each of the first laminated block and the second laminated block includes a plurality of adhesive layers for joining the transparent plate members. The step of positioning the first laminated block and the second laminated block with respect to each other includes the step of recognizing a specific adhesive layer containing a pigment from the plurality of adhesive layers, and the specific adhesive layer as an index. Adjusting the positions of the first laminated block and the second laminated block.

  According to the method of manufacturing an imaging optical element configured as described above, by providing an adhesive layer containing a dye in the first laminated block and the second laminated block, the identification as an index when adjusting the position of the laminated block This adhesive layer can be accurately recognized on the first surface side and the second surface side. Thereby, the positional relationship of the light reflection part required between the 1st lamination block and the 2nd lamination block can be obtained, and the imaging optical element which can obtain a high quality mirror image can be manufactured.

  Preferably, in the manufacturing method of the imaging optical element, the first laminated block and the second laminated block are parallel to the first surface and the second surface after the step of joining the first laminated block and the second laminated block to each other. Forming a plurality of optical elements including the first optical element and the second optical element by cutting along a smooth surface, a light reflecting portion formed on the first optical element, and a second optical element And a step of bonding the first optical element and the second optical element so that the light reflecting portion is orthogonal.

  According to the imaging optical element manufacturing method configured as described above, a high-quality mirror image can be formed in the imaging optical element obtained by joining the first optical element and the second optical element.

  An imaging optical element according to the present invention is an imaging optical element that forms an image of a mirror image of a projection object arranged on one surface side at a spatial position on the other surface side. The imaging optical element includes an optical element having a flat plate shape, in which light reflecting portions having a planar shape are stacked via a transparent plate material. The optical element includes a first divided optical element and a second divided optical element that are positioned relative to each other so that the corresponding light reflecting portions are arranged on the same plane and are joined to each other in the surface direction of the optical element. Each of the first split optical element and the second split optical element includes a plurality of adhesive layers for joining the transparent plates. The plurality of adhesive layers include a specific adhesive layer containing a pigment.

  According to the imaging optical element configured as described above, a high-quality mirror image can be formed.

  As described above, according to the present invention, it is possible to provide an imaging optical element capable of obtaining a high-quality mirror image and a manufacturing method thereof.

It is the schematic which shows the aerial image display apparatus using an imaging optical element. FIG. 2 is an exploded view of the imaging optical element in FIG. 1. It is a top view which shows the imaging optical element in FIG. It is a top view which shows the imaging optical element for a comparison. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the process of the first half which manufactures the imaging optical element in FIG. It is a figure which shows the tiling process of a rectangular parallelepiped block and a 2nd triangle block. It is a figure which shows the cross section of the 2nd triangular block along the XVI-XVI line | wire in FIG. It is a figure which shows the modification of the tiling process of a rectangular parallelepiped block and a 2nd triangle block. It is a figure which shows the modification of the tiling process of a rectangular parallelepiped block and a 2nd triangle block. It is a figure which shows another modification of the tiling process of a rectangular parallelepiped block and a 2nd triangle block. It is a figure which shows another modification of the tiling process of a rectangular parallelepiped block and a 2nd triangle block. FIG. 3 is a diagram illustrating a latter half process of manufacturing the imaging optical element in FIG. 2. FIG. 3 is a diagram illustrating a latter half process of manufacturing the imaging optical element in FIG. 2. FIG. 3 is a diagram illustrating a latter half process of manufacturing the imaging optical element in FIG. 2. FIG. 3 is a diagram illustrating a latter half process of manufacturing the imaging optical element in FIG. 2. FIG. 3 is a diagram illustrating a latter half process of manufacturing the imaging optical element in FIG. 2.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

  FIG. 1 is a schematic view showing an aerial image display device using an imaging optical element. Referring to FIG. 1, the aerial image display device includes an imaging optical element (micromirror array) 10 and a display unit 13.

  The display unit 13 is a liquid crystal display, for example, and is configured to be able to display an image to be a projection object. Instead of the display unit 13, a two-dimensional or three-dimensional object serving as a projection object may be arranged. The imaging optical element 10 forms an image of the mirror image 14 of the projection object at a spatial position that is plane-symmetric with respect to the imaging optical element 10. The imaging optical element 10 has a flat plate (panel) shape having one surface 10a and the other surface 10b disposed on the back side of the one surface 10a. The projection object is disposed on the one surface 10 a side of the imaging optical element 10, and the mirror image 14 is imaged on the other surface 10 b side of the imaging optical element 10.

  FIG. 2 is an exploded view of the imaging optical element in FIG. With reference to FIG. 2, the imaging optical element 10 includes an optical element 21 </ b> P and an optical element 21 </ b> Q, and a transparent substrate 28. The optical element 21P and the optical element 21Q have substantially the same configuration (hereinafter referred to as the optical element 21 unless the optical element 21P and the optical element 21Q are particularly distinguished). The optical element 21 has a flat plate shape. The optical element 21 has a square plan view.

  The optical element 21 includes a plurality of transparent plate members 6 and a plurality of light reflecting portions 7. The transparent plate 6 is made of a transparent resin or glass. The light reflecting portion 7 has a planar shape that forms a reflecting surface. The light reflecting portion 7 is made of a metal such as silver or aluminum, for example. The light reflecting portion 7 is formed on at least one of the two main surfaces of the transparent plate 6 facing each other. The optical element 21 is configured by laminating the light reflecting portion 7 via the transparent plate 6.

  The light reflecting portion 7 extends in one direction within the surface of the optical element 21. The several light reflection part 7 is arrange | positioned at intervals mutually. The several light reflection part 7 is arrange | positioned at equal intervals. The plurality of light reflecting portions 7 extend in parallel to each other in a direction orthogonal to the stacking direction of the light reflecting portions 7.

  The optical element 21P and the optical element 21Q are overlapped in the thickness direction of the optical element 21. The optical element 21P and the optical element 21Q are overlapped so that the light reflecting portion 7 formed on the optical element 21P and the light reflecting portion 7 formed on the optical element 21Q are orthogonal to each other. The optical element 21P and the optical element 21Q are bonded to each other with an adhesive.

  The transparent substrate 28 has a flat plate shape. The transparent substrate 28 is made of, for example, a transparent resin or glass. On the main surface of the transparent base material 28, the optical element 21P and the optical element 21Q are joined using an adhesive.

  FIG. 3 is a plan view showing the imaging optical element in FIG. In the drawing, the transparent substrate 28 in FIG. 2 is omitted. Referring to FIGS. 2 and 3, the optical element 21 has an end side 26 forming one side of a square shape in plan view. The optical element 21 is configured such that the end side 26 and the light reflecting portion 7 formed on the optical element 21 (the optical element 21P and the optical element 21Q) intersect at an angle of 45 °.

  FIG. 4 is a plan view showing an imaging optical element for comparison. Referring to FIG. 4, imaging optical element 110 for comparison has optical element 121P and optical element 121Q in place of optical element 21P and optical element 21Q in FIG. 1 (hereinafter, optical element 121P and optical element 121Q). When the element 121Q is not particularly distinguished, it is referred to as an optical element 121). The optical element 121 has a square plan view having the same size as the optical element 21 in FIG. The optical element 121 is configured such that the end side 26 and the light reflecting portion 7 formed on the optical element 121 (the optical element 121P and the optical element 121Q) are parallel to each other.

  The imaging optical element has the best visibility of the mirror image when light from the projection object is incident at an angle of 45 ° with respect to the reflecting surface formed by the light reflecting portion 7 due to its optical characteristics. Become. In consideration of such optical characteristics, when the imaging optical element 110 is arranged so that the light from the projection is incident at an angle of 45 ° with respect to the reflecting surface, the imaging optical element 110 is not used at the four corners. Region 114 is generated. When such a non-use area 114 occurs, the efficiency in the material and the manufacturing process decreases.

  2 and 3, in contrast, in the imaging optical element 10, the optical element 21 is configured such that the end side 26 and the light reflecting portion 7 intersect at an angle of 45 °. . According to such a configuration, the unused area 114 in FIG. 4 does not occur when the imaging optical element 10 is arranged so that light from the projection object is incident at an angle of 45 ° with respect to the reflecting surface. Therefore, a wider area on the optical element 121 can be contributed to image formation.

  In order to realize a configuration in which the end side 26 and the light reflecting portion 7 intersect at an angle of 45 °, the optical element 21 includes a first divided optical element 22, two second divided optical elements 23, and two third third elements. The split optical element 24 is combined.

  The first split optical element 22 has a square plan view, and is configured such that the direction in which one side extends and the stacking direction of the light reflecting portions 7 are parallel to each other. The second split optical element 23 has a right-angled isosceles triangular plan view, and is configured such that the direction in which the hypotenuse extends and the direction in which the light reflecting portions 7 are stacked are parallel. The third split optical element 24 has a right-angled isosceles triangular plan view, and is configured such that the direction in which the hypotenuse extends and the direction in which the light reflecting portions 7 are stacked are orthogonal to each other.

  Next, a method for manufacturing the imaging optical element in the present embodiment will be described. In the following, as a representative example, a case where the manufacturing method of the imaging optical element in the present invention is applied to the manufacturing of the imaging optical element 10 in FIG. 1 will be described.

  5 to 14 are diagrams showing the first half of the process for manufacturing the imaging optical element in FIG. Referring to FIG. 5, first, glass plate 31 having both surfaces coated with Al (aluminum) coating by sputtering is prepared. Finally, the glass plate 31 constitutes the transparent plate material 6 in FIG. 2, and the Al coating films provided on both surfaces of the glass plate 31 constitute the light reflecting portion 7 in FIG. 2. As an example, the glass plate 31 has a size of length 200 mm × width 400 mm × thickness 0.5 mm. The Al coating film has a thickness of 100 nm.

  Next, referring to FIG. 6, an adhesive 32 in which beads are mixed is applied to the surface of the glass plate 31. As the adhesive 32, an epoxy-based adhesive can be used. As an example, the thickness of the adhesive 32 is 10 μm.

  With reference to FIG. 7, next, the two glass plates 31 are joined by overlapping another glass plate 31 on the glass plate 31 to which the adhesive 32 is applied.

  With reference to FIG. 8, the first laminated body block 34 in which a plurality of glass plates 31 are laminated is produced by further repeating the steps shown in FIGS. 6 and 7. Under the present circumstances, the height of the 1st laminated body block 34 in the lamination direction of the glass plate 31 is made equal to the vertical length of the glass plate 31. FIG. For example, when the vertical length of the glass plate 31 is 200 mm, the height of the first laminated body block 34 in the stacking direction of the glass plate 31 is set to 200 mm.

  With reference to FIGS. 9 and 10, next, the first laminated body block 34 is cut along the center line 102 in the lateral direction of the glass plate 31. Thereby, the first laminated body block 34 is divided into a rectangular parallelepiped block 36 and a rectangular parallelepiped block 41.

  11 and 12, next, the rectangular parallelepiped block 36 is cut along the diagonal line 103 of the cut surface in the previous step. Thereby, the rectangular parallelepiped block 36 is divided into two second triangular blocks 61 and two first triangular blocks 51.

  Referring to FIGS. 13 and 14, next, a rectangular parallelepiped block 41, two second triangular blocks 61, and two first triangular blocks 51 are combined by using an adhesive. The two-layered body block 37 is produced (hereinafter, this process is also referred to as “tiling process”).

  Here, the rectangular parallelepiped block 41 has a first surface 41a. The end of the light reflecting portion 7 (Al coating film) is exposed on the first surface 41a. The first surface 41a has a square plan view. The direction in which one side of the square extends in the plan view of the first surface 41a is parallel to the stacking direction of the light reflecting portions 7 (the direction indicated by the arrow 106 in FIG. 13). Two sides of the first surface 41a perpendicular to each other are one side extending in the height direction of the first laminate block 34 in FIG. 8 and one side extending in the longitudinal direction of the glass plate 31 of the first laminate block 34. Correspond.

  The rectangular parallelepiped block 41 further has a second surface 41b. The second surface 41b is disposed on the back side of the first surface 41a. The second surface 41b is provided in the same form as the first surface 41a.

  The rectangular parallelepiped block 41 further has a third surface 41c and a fourth surface 41d. The 3rd surface 41c and the 4th surface 41d are surfaces orthogonal to the lamination direction (direction shown by the arrow 106 in FIG. 13) of the light reflection part 7. FIG. The third surface 41c and the fourth surface 41d are arranged so as to be front and back. The 3rd surface 41c and the 4th surface 41d are comprised by the light reflection part 7 extended planarly. The rectangular parallelepiped block 41 further has a fifth surface 41e and a sixth surface 41f. The 5th surface 41e and the 6th surface 41f are parallel to the lamination direction (direction shown by the arrow 106 in FIG. 13) of the light reflection part 7, and are the surfaces extended in the surface orthogonal to the 1st surface 41a. It is. The fifth surface 41e and the sixth surface 41f are arranged so as to be front and back. The end portions of the light reflecting portion 7 are exposed on the fifth surface 41e and the sixth surface 41f.

  The second triangular block 61 and the first triangular block 51 have a first surface 61a and a first surface 51a, respectively. The edge part of the light reflection part 7 is exposed to the 1st surface 61a and the 1st surface 51a. The first surface 61a and the first surface 51a have a planar view of a right isosceles triangle. In the second triangular block 61, the direction in which the hypotenuse of the right-angled isosceles triangle extends in the plan view of the first surface 61a is parallel to the stacking direction of the light reflecting portions 7 (the direction indicated by the arrow 106 in FIG. 13). . In the first triangular block 51, the direction in which the hypotenuse of the right isosceles triangle extends in the plan view of the first surface 51a is orthogonal to the stacking direction of the light reflecting portions 7 (the direction indicated by the arrow 106 in FIG. 13).

  The length of the hypotenuse of the right isosceles triangle in plan view of the first surface 61a and the first surface 51a is equal to the length of one side of the square in plan view of the first surface 41a.

  The second triangular block 61 and the first triangular block 51 further have a second surface 61b and a second surface 51b, respectively. The second surface 61b and the second surface 51b are disposed on the back side of the first surface 61a and the first surface 51a, respectively. The second surface 61b and the second surface 51b are provided in the same form as the first surface 61a and the first surface 51a, respectively.

  The second triangular block 61 has a seventh surface 61g. The seventh surface 61g is a surface that is parallel to the stacking direction of the light reflecting portions 7 (the direction indicated by the arrow 106 in FIG. 13) and extends in a plane orthogonal to the first surface 61a. The end portion of the light reflecting portion 7 is exposed at the seventh surface 61g. The first triangular block 51 has an eighth surface 51h. The eighth surface 51h is a surface orthogonal to the stacking direction of the light reflecting portions 7 (the direction indicated by the arrow 106 in FIG. 13). The 8th surface 51h is comprised by the light reflection part 7 extended planarly.

  The lengths of the rectangular parallelepiped block 41, the second triangular block 61, and the first triangular block 51 in the height direction in FIG. 13 are not particularly limited, and are, for example, equal to one side of the first surface 41a of the rectangular parallelepiped block 41. The length may be sufficient, and the length longer than one side of the 1st surface 41a of the rectangular parallelepiped block 41 may be sufficient.

  The rectangular parallelepiped block 41 and the first surface 41a, the first surface 51a and the first surface 61a are flush with each other, and the second surface 41b, the second surface 51b and the second surface 61b are flush with each other during the tiling process. Two second triangular blocks 61 and two first triangular blocks 51 are combined. Further, the rectangular parallelepiped block 41 and the two second triangular blocks 61 are combined so that the fifth surface 41e and the sixth surface 41f and the seventh surface 61g face each other. Moreover, the rectangular parallelepiped block 41 and the two first triangular blocks 51 are combined so that the third surface 41c and the fourth surface 41d and the eighth surface 51h face each other.

  The 2nd laminated body block 37 produced by the tiling process demonstrated above has a square in the planar view direction of the 1st surface 41a, the 1st surface 51a, and the 1st surface 61a. The second stacked body block 37 is configured such that the direction in which one side of the square extends and the light reflecting portion 7 intersect at an angle of 45 °.

  Subsequently, the tiling process of the rectangular parallelepiped block 41 (first stacked block) and the second triangular block 61 (second stacked block) will be described in more detail.

  FIG. 15 is a diagram illustrating a tiling process of a rectangular parallelepiped block and a second triangular block. In the drawing, the vicinity of the joint surface of the rectangular parallelepiped block 41 and the second triangular block 61 is shown enlarged. FIG. 16 is a diagram illustrating a cross section of the second triangular block along the line XVI-XVI in FIG. 15.

  Referring to FIG. 15 and FIG. 16, during the tiling process of the rectangular parallelepiped block 41 and the second triangular block 61, the first surface 41 a and the first surfaces 61 a and the second surface are arranged between the rectangular parallelepiped block 41 and the second triangular block 61. The rectangular parallelepiped block 41 and the second triangular block 61 are arranged side by side so that 41b and the second surface 61b are flush with each other, and the corresponding light reflecting portions 7 between the rectangular parallelepiped block 41 and the second triangular block 61 are on the same plane. The rectangular parallelepiped block 41 and the second triangular block 61 are positioned relative to each other such that

  At this time, light is input from the first surface 41a and the first surface 61a side, and the light is detected on the second surface 41b and the second surface 61b side, so that the specific blocks in the rectangular parallelepiped block 41 and the second triangular block 61 are detected. The transparent plate 6S is recognized. The positions of the rectangular parallelepiped block 41 and the second triangular block 61 are adjusted using the specific transparent plate 6S as an index.

  More specifically, the lens 71 is disposed at a position facing the first surface 61 a of the second triangular block 61, and the photodetector 72 is disposed at a position facing the second surface 61 b of the second triangular block 61. Accordingly, the laser light is condensed on one transparent plate 6 among the plurality of transparent plates 6 through the lens 71. The laser light guides through the transparent plate 6 from the first surface 61a side and reaches the second surface 61b side. By detecting the laser beam emitted from the second surface 61b side by the photodetector 72, the transparent plate material 6 that has guided the laser beam is used as a specific transparent plate material on the first surface 61a side and the second surface 61b side. Recognize as 6S. Also in the rectangular parallelepiped block 41, a specific transparent plate material 6S is recognized on the first surface 41a side and the second surface 41b side by the same process.

  Using the specific transparent plate 6S recognized on the first surface 41a side and the second surface 61b side as an index, the corresponding light reflecting portions 7 between the rectangular parallelepiped block 41 and the second triangular block 61 are arranged on the same plane. In this manner, the positions of the rectangular parallelepiped block 41 and the second triangular block 61 are adjusted. At this time, the first surface 41a and the second surface 41b of the rectangular parallelepiped block 41 and the first surface 61a and the second surface 61b of the second triangular block 61 are magnified and observed using a magnification observation device such as a camera or a microscope. May be. The rectangular parallelepiped block 41 and / or the second triangular block 61 are shifted in the direction orthogonal to the reflecting surface formed by the light reflecting portion 7 or tilted so that the inclination of the reflecting surface formed by the light reflecting portion 7 changes. Accordingly, the corresponding light reflecting portions 7 between the rectangular parallelepiped block 41 and the second triangular block 61 are arranged on the same plane.

  The means for introducing laser light is not limited to the lens 71 described above. For example, by arranging the tip of the optical fiber directly above the first surfaces 61a and 41a, the laser light from the optical fiber is transmitted to the transparent plate 6. The method to introduce in is mentioned. As the photodetector 72 for detecting laser light, a photodiode (one-dimensional), a line sensor (one-dimensional), an image sensor (two-dimensional), or the like can be used.

  After the rectangular parallelepiped block 41 and the second triangular block 61 are positioned with respect to each other, the rectangular parallelepiped block 41 and the second triangular block 61 are joined to each other. Thereby, the tiling process of the rectangular parallelepiped block 41 and the second triangular block 61 is completed.

  FIGS. 17 and 18 are diagrams showing a modification of the tiling process of the rectangular parallelepiped block and the second triangular block. In FIG. 17, the magnified observation image of the 1st surface 41a of the rectangular parallelepiped block 41 and the 1st surface 61a of the 2nd triangle block 61 by a microscope is shown. FIG. 18 shows a cross section of the second triangular block 61 corresponding to FIG.

  Referring to FIGS. 17 and 18, in this modification, when positioning the rectangular parallelepiped block 41 and the second triangular block 61 with each other, an electric signal is input from the first surface 41a and the first surface 61a side, and the second A specific light reflecting portion 7S in the rectangular parallelepiped block 41 and the second triangular block 61 is recognized by detecting an electrical signal on the surface 41b and the second surface 61b side. The positions of the rectangular parallelepiped block 41 and the second triangular block 61 are adjusted using the specific light reflecting portion 7 as an index.

  More specifically, an electric detector 74 having a probe 73 and a probe 75 is prepared. An electrical signal is input to one of the light reflecting portions 7 from the first surface 61 a side of the second triangular block 61 through the probe 73. By detecting the electrical signal on the second surface side of the second triangular block 61 by the probe 75, the energized light reflecting portion 7 is changed to a specific light reflecting portion on the first surface 61a side and the second surface 61b side. It is recognized as 7S. Also in the rectangular parallelepiped block 41, a specific light reflecting portion 7S is recognized on the first surface 41a side and the second surface 41b side by the same process.

  The corresponding light reflecting portions 7 between the rectangular parallelepiped block 41 and the second triangular block 61 are arranged on the same plane with the specific light reflecting portion 7S recognized on the first surface 41a side and the second surface 61b side as an index. Thus, the positions of the rectangular parallelepiped block 41 and the second triangular block 61 are adjusted.

  As the electric detector 74, for example, a tester capable of measuring a direct current can be used.

  FIG. 19 is a diagram illustrating another modification of the tiling process of the rectangular parallelepiped block and the second triangular block.

  Referring to FIG. 19, the rectangular parallelepiped block 41 has a plurality of adhesive layers 8 for joining the transparent plate members 6 together. Similarly, the second triangular block 61 has a plurality of adhesive layers 8. In this modification, the adhesive layer 8 has conductivity. In place of the light reflecting portion 7 in FIGS. 17 and 18, by energizing the adhesive layer 8, the energized adhesive layer 8 is recognized as a specific adhesive layer 8S.

  FIG. 20 is a diagram showing still another modified example of the tiling process of the rectangular parallelepiped block and the second triangular block.

  Referring to FIG. 20, the rectangular parallelepiped block 41 has a plurality of adhesive layers 8 for joining the transparent plate members 6 together. In this modification, the plurality of adhesive layers 8 have a specific adhesive layer 8T containing a pigment. The pigment means a component that gives color to an object, and the kind thereof is not particularly limited. The specific adhesive layer 8 </ b> T contains a pigment, thereby causing a visual difference from the other adhesive layers 8. For example, by mixing black graphite or ink into the adhesive, a difference in contrast occurs between the specific adhesive layer 8T and the other adhesive layer 8, or a pigment such as red or silver is added to the adhesive. By mixing, a difference in color or light reflectivity occurs between the specific adhesive layer 8T and the other adhesive layer 8.

  When the rectangular parallelepiped block 41 and the second triangular block 61 are positioned relative to each other, a specific adhesive layer 8T is recognized from among the plurality of adhesive layers 8. More specifically, the first surface 41a and the second surface 41b of the rectangular parallelepiped block 41, and the first surface 61a and the second surface 61b of the second triangular block 61, using a magnification observation device 77 such as a camera or a microscope. Magnify the observation. Thereby, the specific adhesive layer 8T visually different from the other adhesive layer 8 is recognized. Next, the positions of the rectangular parallelepiped block 41 and the second triangular block 61 are adjusted using the specific adhesive layer 8T as an index.

  As described above, in the present embodiment, the same specific layer is detected on the first surface 41a, 61a side and the second surface 41b, 61b side of the rectangular parallelepiped block 41 and the second triangular block 61, and the same The positions of the rectangular parallelepiped block 41 and the second triangular block 61 are adjusted using the specific layer as an index. Thereby, the parallel relationship of the light reflection part 7 required between the rectangular parallelepiped block 41 and the 2nd triangle block 61 can be obtained with high precision.

  As a method of detecting the same specific layer on the first surface 41a, 61a side and the second surface 41b, 61b side, there are methods such as measuring the distance from the block side surface and counting the number of layers. However, in these methods, a dimensional error occurs due to variations in processing accuracy of blocks, and a counting error occurs due to a narrow interval between layers (for example, 0.5 mm). There is a problem that it is recognized as a layer, or a great deal of labor is required to detect the same layer. On the other hand, in the present embodiment, the same layer is used on the first surface 41a, 61a side and the second surface 41b, 61b side in order to introduce light or electric signals and to use the visual difference of the adhesive layer 8. Can be accurately detected in a non-destructive manner.

  21 to 25 are views showing the latter half of the process for manufacturing the imaging optical element in FIG. Referring to FIGS. 21 and 22, the second laminated body block 37 obtained in the previous tiling process is cut by a plane 104 parallel to the first surface 41a, the first surface 61a, and the first surface 51a. Thereby, the second laminated body block 37 is divided into a plurality of optical elements 21. The rectangular parallelepiped block 41 in the second laminate block 37 constitutes the first divided optical element 22 in the optical element 21, and the second triangular block 61 in the second laminate block 37 is the second divided optical element 23 in the optical element 21. The first triangular block 51 in the second stacked body block 37 constitutes the third divided optical element 24 in the optical element 21.

  Referring to FIG. 23, next, both surfaces 21a and 21b of the optical element 21 are polished. Referring to FIG. 24, two of the plurality of optical elements 21 are referred to as an optical element 21P and an optical element 21Q. Next, the optical element 21P and the optical element 21Q are overlapped so that the light reflecting portion 7 formed on the optical element 21P and the light reflecting portion 7 formed on the optical element 21Q are orthogonal to each other, and these are joined. To do.

  Referring to FIG. 25, optical element 21 </ b> P and optical element 21 </ b> Q that are bonded to each other are bonded to the main surface of transparent substrate 28. Through the above steps, the imaging optical element 10 in FIG. 2 is completed.

  The imaging optical element 10 manufactured by the tiling process shown in FIG. 20 includes an optical element 21 having a flat plate shape, in which light reflecting portions 7 having a planar shape are laminated via a transparent plate material 6. The optical elements 21 are positioned so that the corresponding light reflecting portions 7 are arranged on the same plane, and the first divided optical element 22 and the second divided optical element 23 that are joined to each other in the surface direction of the optical element 21 are arranged. Including. Each of the first divided optical element 22 and the second divided optical element 23 includes a plurality of adhesive layers 8 for bonding the transparent plate members 6 to each other. The plurality of adhesive layers 8 include a specific adhesive layer 8T containing a pigment.

  According to the method of manufacturing the imaging optical element 10 according to the embodiment of the present invention configured as described above, the light reflecting portion 7 required between the rectangular parallelepiped block 41 and the second triangular block 61 can be obtained by a simple method. A parallel relationship can be obtained with high accuracy. Thereby, it is possible to realize the imaging optical element 10 capable of obtaining a high-quality mirror image while reducing man-hours (cost reduction).

  In the above, the imaging optical element manufacturing method according to the present invention is applied to the manufacturing of the imaging optical element 10 in which the end 26 of the optical element 21 and the light reflecting portion 7 intersect at an angle of 45 °. Although explained, it is not limited to this. For example, in the imaging optical element 110 for comparison in FIG. 4, when the optical element 121 has a large-sized structure by tiling, the imaging optical element in the present invention is used for manufacturing the imaging optical element 110. It is possible to apply this manufacturing method.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is mainly applied to manufacture of an aerial video display device.

  6 transparent plate material, 6S specific transparent plate material, 7 light reflecting portion, 7S specific light reflecting portion, 8 adhesive layer, 8S, 8T specific adhesive layer 10, 110 imaging optical element, 10a one surface, 10b Other surface, 13 display unit, 14 mirror image, 21, 21P, 21Q, 121, 121P, 121Q optical element, 21a, 21b both sides, 22 first divided optical element, 23 second divided optical element, 24 third divided optical Element, 26 End side, 28 Transparent base material, 31 Glass plate, 32 Adhesive, 34 1st laminated body block, 36, 41 rectangular parallelepiped block, 37 2nd laminated body block, 41a, 51a, 61a 1st surface, 41b, 51b, 61b 2nd surface, 41c 3rd surface, 41d 4th surface, 41e 5th surface, 41f 6th surface, 51 1st triangular block, 51h 8th surface, 61 2nd triangular block 61g 7th surface, 71 lens, 72 photodetector, 73,75 probe, 74 electrical detector, 77 magnifying device, 102 center line, 103 diagonal, 104 plane, 114 unused area.

Claims (6)

A method for manufacturing an imaging optical element that forms a mirror image of a projection object arranged on one surface side in a spatial position on the other surface side,
A step of preparing a first laminated block and a second laminated block in which light reflecting portions having a planar shape are laminated via a transparent plate material, and the plurality of light reflecting portions are arranged in parallel with each other;
Each of the first laminated block and the second laminated block has a first surface and a second surface that are arranged on the front and back, with the end portions of the plurality of light reflecting portions exposed, and
Positioning the first laminated block and the second laminated block relative to each other so that the corresponding light reflecting portions between the first laminated block and the second laminated block are arranged in the same plane;
Bonding the first laminated block and the second laminated block positioned to each other, and
The step of positioning the first laminated block and the second laminated block with respect to each other,
Recognizing a specific layer in the first laminated block and the second laminated block by inputting an electric signal or light from the first face side and detecting the electric signal or light on the second face side When,
And a step of adjusting the positions of the first laminated block and the second laminated block using the specific layer as an index. In the first laminated block and the second laminated block, a plurality of metal reflecting surfaces are formed by the light reflecting portion,
In the step of recognizing a specific layer in the first laminated block and the second laminated block, an electric signal is input from the metal reflecting surface on the first surface side, and an electric signal is generated on the metal reflecting surface on the second surface side. The method of manufacturing an imaging optical element according to claim 1, further comprising a step of recognizing a specific metal reflection surface among the plurality of metal reflection surfaces by detecting a signal. Each of the first laminated block and the second laminated block has conductivity, and includes a plurality of adhesive layers for joining the transparent plate members,
The step of recognizing a specific layer in the first laminated block and the second laminated block includes inputting an electric signal from the adhesive layer on the first surface side, and electricizing the adhesive layer on the second surface side. The manufacturing method of the imaging optical element of Claim 1 or 2 including the process of recognizing the specific said adhesive bond layer of the said some adhesive bond layers by detecting a signal. A method for manufacturing an imaging optical element that forms a mirror image of a projection object arranged on one surface side in a spatial position on the other surface side,
A step of preparing a first laminated block and a second laminated block in which light reflecting portions having a planar shape are laminated via a transparent plate material, and the plurality of light reflecting portions are arranged in parallel with each other;
Each of the first laminated block and the second laminated block has a first surface and a second surface that are arranged on the front and back, with the end portions of the plurality of light reflecting portions exposed, and
Positioning the first laminated block and the second laminated block relative to each other so that the corresponding light reflecting portions between the first laminated block and the second laminated block are arranged in the same plane;
Bonding the first laminated block and the second laminated block positioned to each other, and
Each of the first laminated block and the second laminated block includes a plurality of adhesive layers for joining the transparent plate members,
The step of positioning the first laminated block and the second laminated block with respect to each other,
Recognizing the specific adhesive layer containing a pigment from the plurality of adhesive layers;
And a step of adjusting the positions of the first laminated block and the second laminated block using the specific adhesive layer as an index. After the step of joining the first laminated block and the second laminated block to each other, cutting the first laminated block and the second laminated block along a plane parallel to the first surface and the second surface, Forming a plurality of optical elements including a first optical element and a second optical element;
The step of joining the first optical element and the second optical element so that the light reflecting part formed on the first optical element and the light reflecting part formed on the second optical element are orthogonal to each other. The manufacturing method of the imaging optical element of any one of Claim 1 to 4 further equipped with these. An imaging optical element that forms a mirror image of a projection object disposed on one surface side at a spatial position on the other surface side,
The light reflecting portion having a planar shape is laminated via a transparent plate material, and includes an optical element having a flat plate shape,
The optical element includes a first divided optical element and a second divided optical element that are positioned so that the corresponding light reflecting portions are arranged in the same plane and are joined to each other in the surface direction of the optical element,
Each of the first split optical element and the second split optical element includes a plurality of adhesive layers for joining the transparent plate members,
The imaging optical element, wherein the plurality of adhesive layers include a specific adhesive layer containing a dye.

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