WO2017146017A1

WO2017146017A1 - Image-forming element and method for producing same

Info

Publication number: WO2017146017A1
Application number: PCT/JP2017/006285
Authority: WO
Inventors: 将也木下; 藤井　雄一
Original assignee: コニカミノルタ株式会社
Priority date: 2016-02-26
Filing date: 2017-02-21
Publication date: 2017-08-31
Also published as: JPWO2017146017A1; JP6372630B2

Abstract

An image-forming element (1) equipped with a first reflective element (10) positioned on a first principal surface (1a) side thereof, and also equipped with a second reflective element (20) positioned on a second principal surface (1b) side thereof, wherein an actual image of an object positioned in a spatial position on the first principal surface (1a) side is formed in a spatial position on the second principal surface (1b) side. The second reflective element (20) is configured as a composite reflective element that includes a plurality of unit reflective elements (20A-20I) arranged in a planar pattern, and a seam section (23) for joining the unit reflective elements. The outside principal surface (20a) that forms the second principal surface (1b) of the second reflective element (20) comprising the composite reflective element is flatter than the inside principal surface (20b) of the second reflective element (20).

Description

Imaging element and manufacturing method thereof

The present invention relates to an imaging element used in an aerial image display device that can display an aerial image and a method for manufacturing the same. More specifically, the present invention relates to a real image of an object arranged at a spatial position on one main surface side. In particular, the present invention relates to an imaging element that forms an image at a spatial position on the principal surface side and a manufacturing method thereof.

Conventionally, as an imaging element used in an aerial image display device, an element generally called a two-plane corner reflector array element has been used. As a two-sided corner reflector array element, two flat reflection elements in which a plurality of reflectors are laminated via a transparent body in a direction perpendicular to the main surface are used, and these two reflection elements are laminated on each other. In some cases, the layers are stacked in the thickness direction so that the directions are orthogonal to each other.

In this type of two-sided corner reflector array element, as disclosed in, for example, International Publication No. 2009/131128 (Patent Document 1), Japanese Patent Application Laid-Open No. 2012-128456 (Patent Document 2), and the like, Are generally joined using a light-transmitting adhesive.

Also, in this type of two-sided corner reflector array element, the area is often increased by increasing the size of each of the two reflecting elements using a technique generally referred to as tiling. This tiling is a technique in which a plurality of small unit reflective elements are arranged in a plane and these end portions are connected to each other to form one large composite reflective element.

References that specifically disclose details of the tiling include, for example, Japanese Patent Application Laid-Open No. 2011-90117 (Patent Document 3), Japanese Patent Application Laid-Open No. 2013-101230 (Patent Document 4), and Japanese Patent Application Laid-Open No. 2013-167670. (Patent Document 5).

International Publication No. 2009/131128 JP 2012-128456 A JP 2011-90117 A JP2013-101230A JP 2013-167670 A

However, when the above tiling is applied, due to manufacturing restrictions, a pair of main surfaces of the composite reflective element formed by connecting a plurality of unit reflective elements to each other are both ideal planes. It is very difficult.

For example, when a unit reflection element is manufactured, a polishing process is generally performed so that a pair of main surfaces of the unit reflection surface is flattened. The thickness will be different, and this will prevent the pair of principal surfaces of the composite reflective element from being ideally flat.

As described above, when unit reflective elements having different thicknesses are connected by tiling to form a composite reflective element, a step is generated at the joint portion between adjacent unit reflective elements. When such a level difference occurs on the main surface of the composite reflective element, the level difference part functions as an unnecessary reflection surface during image formation, and this appears as a streak-like defect in the displayed aerial image. As a result, a problem that leads to deterioration of display quality is caused.

In addition, the above-described steps not only cause cracks and chipping in the imaging element, but also cause injury to the fingers during handling. Cause problems. Here, in order to suppress the occurrence of the above-described step, it is possible to chamfer the corner portion connecting the end surface and the main surface of the unit reflecting element. Continuity will be impaired, and as a result, display quality will be reduced.

Therefore, the present invention has been made to solve the above-described problems, and can display a high-definition aerial image, and is difficult to be damaged and hardly causes injury during handling, and its manufacture. It aims to provide a method.

An imaging element according to the present invention has a first main surface and a second main surface that are positioned relative to each other in the thickness direction, and a real image of an object disposed at a spatial position on the first main surface side is the second main surface. An image is formed at a spatial position on the main surface side, and is a flat plate-like first reflecting element arranged on the first main surface side and a flat plate-like second reflection arranged on the second main surface side. Device. The first reflective element includes a plurality of first reflectors arranged in parallel to each other so as to be aligned along a first direction orthogonal to the thickness direction, and an adjacent first of the plurality of first reflectors. A plurality of first transparent bodies filling between the reflectors. The second reflecting element includes a plurality of second reflectors arranged in parallel to each other so as to be aligned along a second direction orthogonal to both the thickness direction and the first direction, and the plurality of second reflectors. And a plurality of second transparent bodies filling between adjacent second reflectors. The first reflecting element has an inner main surface that faces the second reflecting element, and an outer main surface that is positioned opposite to the inner main surface and that defines the first main surface. The second reflecting element has an inner main surface that faces the first reflecting element, and an outer main surface that is positioned opposite to the inner main surface and that defines the second main surface. The second reflective element is composed of a composite reflective element including a plurality of flat unit reflective elements arranged side by side in a plane and a joint that joins end portions of the plurality of unit reflective elements. Yes. The flatness of the outer main surface of the second reflective element made of the composite reflective element is higher than the flatness of the inner main surface of the second reflective element made of the composite reflective element.

The term “flatness” as used herein means what is called “maximum inclined flatness”, and all the points on the surface are in two planes parallel to the representative plane of the surface. In addition, the distance between the two planes when the distance between the two planes is minimized. As a method of calculating the flatness, a least square plane is obtained from all measurement points within a specified measurement range, and the length between two planes parallel to the least square plane and passing through the positive and negative peak points is calculated. The method to ask is mentioned. Further, high flatness means that the distance between the two surfaces is small, and low flatness means that the distance between the two surfaces is large.

An imaging element manufacturing method according to a first aspect of the present invention is a manufacturing method for manufacturing the imaging element according to the present invention described above, the step of forming the first reflective element, and the first A step of forming the second reflective element by connecting ends of the plurality of unit reflective elements in a state where the plurality of unit reflective elements to be two reflective elements are arranged in a plane on a surface plate; In the step of forming the second reflective element, the first reflective element and the second reflective element are such that the main surface on the side arranged in contact with the surface plate becomes the outer main surface of the second reflective element. And overlapping and fixing.

An imaging element manufacturing method according to a second aspect of the present invention is a manufacturing method for manufacturing the above-described imaging element according to the present invention, wherein the plurality of unit reflection elements are the first reflection elements. Are arranged in a plane on the surface plate, and the ends of the plurality of unit reflection elements are joined together to form the first reflection element, and the plurality of the second reflection elements The step of forming the second reflective element by joining the end portions of the plurality of unit reflective elements in a state where the unit reflective elements are arranged in a plane on the surface plate, and the first reflective element is formed. The main surface on the side disposed in contact with the surface plate in the step of forming the second reflective element is the main surface on the side disposed in contact with the surface plate, and on the side disposed in contact with the surface plate in the step of forming the second reflective element. The main surface is the above So that the outer principal surface of the reflective element, and a step of fixing by superimposing and the first reflecting element and the second reflective element.

According to the present invention, it is possible to provide an imaging element that can display a high-definition aerial image and is less likely to be damaged and hardly cause injury during handling, and a method for manufacturing the same.

It is a schematic plan view of the imaging element in the embodiment of the present invention. It is a schematic cross section of the imaging element shown in FIG. It is a schematic cross section of the imaging element shown in FIG. It is a conceptual diagram which shows the mechanism in which an aerial image | video is displayed by using the imaging element shown in FIG. It is an expanded sectional view of the principal part of the imaging element shown in FIG. It is an expanded sectional view of the principal part of the imaging element shown in FIG. It is the typical perspective view and sectional view showing the formation process of the 1st reflective element of the image formation element in an embodiment of the invention. It is the typical perspective view and sectional drawing which show the formation process of the 2nd reflective element of the image formation element in embodiment of this invention. It is the typical perspective view and sectional view showing the joining process of the 1st reflective element and the 2nd reflective element of the image formation element in an embodiment of the invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

FIG. 1 is a schematic plan view of an imaging element according to an embodiment of the present invention. 2 is a schematic cross-sectional view of the imaging element shown in FIG. 1 taken along the line II-II shown in FIG. 1, and FIG. 3 is a sectional view of the imaging element shown in FIG. It is a schematic cross section along a line. First, with reference to these FIG. 1 thru | or FIG. 3, the schematic structure of the imaging element 1 in this Embodiment is demonstrated.

As shown in FIGS. 1 to 3, the imaging element (generally referred to as “two-sided corner reflector array element” or “micromirror array element”) 1 has a substantially flat plate shape as a whole. The 1st reflective element 10, the 2nd reflective element 20, and the translucent adhesive layer 30 are provided.

The first reflective element 10 is made of a flat plate-like member having an outer main surface 10a and an inner main surface 10b that are positioned in the thickness direction, and has a square shape when viewed along the thickness direction.

The first reflecting element 10 is composed of a composite reflecting element in which a plurality of unit reflecting elements are connected. In the present embodiment, the first reflecting element 10 includes nine unit reflecting elements 10A to 10I having the same dimensions except for the thickness. It is out. Each of the unit reflecting elements 10A to 10I has a substantially flat plate shape, and has a square shape when viewed along the thickness direction. 2 and 3, the thicknesses of the unit reflecting elements 10A to 10D and 10G are equally described for the sake of drawing.

More specifically, the first reflecting element 10 includes the nine unit reflecting elements 10A to 10I arranged in a plane in 3 rows and 3 columns, and a plane located between the nine unit reflecting elements 10A to 10I. An adhesive layer 13 as a joint portion in the form of a lattice, and by joining the end portions of adjacent unit reflective elements among the nine unit reflective elements 10A to 10I by the adhesive layer 13, It is formed as a composite reflecting element that is enlarged as a whole.

Each of the unit reflecting elements 10A to 10I constituting the first reflecting element 10 is composed of a plurality of first reflectors 11 and a plurality of first transparent bodies 12. The plurality of first reflectors 11 and the plurality of first transparent bodies 12 constituting each of the unit reflection elements 10A to 10I are alternately stacked in a first direction (left-right direction in FIG. 1) orthogonal to the thickness direction. Has been.

That is, the stacking direction of the plurality of first reflectors 11 and the plurality of first transparent bodies 12 in the unit reflecting elements 10A to 10I is such that the first reflector 11 and the first transparent body 12 as a whole in the first reflector 10 are the same. All are arranged so as to face the same direction so as to have continuity. Thereby, in the 1st reflective element 10, the some 1st reflector 11 and the some 1st transparent body 12 are alternately laminated | stacked and located in the said 1st direction in the whole region. In addition, in FIG. 1, the 1st reflector 11 is shown with the broken line.

The first reflector 11 positioned inside each of the unit reflecting elements 10A to 10I includes a pair of reflecting films 11a (see FIG. 5) and an adhesive layer 11b (see FIG. 5) positioned between the pair of reflecting films 11a. ). The pair of reflective films 11a and the adhesive layer 11b are arranged side by side along the first direction, and the pair of reflective films 11a are joined by being in direct contact with both side surfaces of the adhesive layer 11b.

On the other hand, among the joint portions of the unit reflection elements 10A to 10I, in the joint portion located at the portion sandwiched by the unit reflection elements in the first direction, the first reflector 11 is made of a pair of reflection films 11a (FIG. 5). And an adhesive layer 13 (see FIG. 5) located between the pair of reflective films 11a. The pair of reflective films 11 a and the adhesive layer 13 are arranged side by side along the first direction, and the pair of reflective films 11 a are joined by being in direct contact with both side surfaces of the adhesive layer 13.

The plurality of first reflectors 11 are arranged in parallel to each other, and each of them extends along a second direction (vertical direction in FIG. 1) orthogonal to both the thickness direction and the first direction. ing. The plurality of first transparent bodies 12 are arranged in parallel to each other so as to fill the space between the adjacent first reflectors 11, and each of them extends along the second direction.

The pair of reflective films 11a are made of, for example, a metal such as aluminum or silver, and the adhesive layer 11b and the adhesive layer 13 are made of, for example, a cured product of an epoxy adhesive. Moreover, the 1st transparent body 12 is comprised, for example with glass or transparent resin.

The width, which is the size of each reflective film 11a in the first direction, is, for example, about 50 [nm] or more and 200 [nm] or less, and the individual adhesive layers 11b and the individual adhesive layers 13 in the first direction. The width as the size is, for example, about 5 [μm] or more and 30 [μm] or less. Therefore, the width, which is the size of each first reflector 11 in the first direction, is approximately the same as the width of each individual adhesive layer 11 b and the width of each individual adhesive layer 13. Moreover, the width which is the magnitude | size in the said 1st direction of each 1st transparent body 12 is about 300 [micrometers] or more and 2000 [micrometers] or less, for example.

Here, the cross-sectional shape orthogonal to the extending direction of each of the plurality of first reflectors 11 and each of the plurality of first transparent bodies 12 (that is, the second direction) is a rectangular shape. Thus, the plurality of first reflectors 11 and the plurality of first transparent bodies 12 are arranged in close contact with each other in the first direction, so that the first reflective element 10 has a flat plate shape as described above. have.

In addition, the thickness of the 1st reflective element 10 is about 900 [micrometers] or more and 6000 [micrometers] or less, for example. The length of one side perpendicular to the thickness direction of each of the unit reflecting elements 10A to 10I is about 10 [cm] to 50 [cm]. Therefore, the length of one side perpendicular to the thickness direction of the first reflecting element 10 in the present embodiment in which nine unit reflecting elements 10A to 10I are tiled is, for example, about 30 [cm] to 150 [cm]. It is.

By having the above configuration, the first reflective element 10 has a plurality of reflective surfaces therein. Each of the plurality of reflective surfaces is on the surface of the first reflector 11 in the portion facing the adjacent first transparent body 12 (that is, the surface of the portion of the reflective film 11a facing the first transparent body 12). Accordingly, two reflecting surfaces facing in opposite directions are formed for each first reflector 11.

The second reflecting element 20 is formed of a flat plate-like member having an outer main surface 20a and an inner main surface 20b that are positioned opposite to each other in the thickness direction, and has substantially the same thickness as the first reflecting element 10 and is seen along the thickness direction. In this case, it has a square shape having the same size as the first reflective element 10.

The second reflecting element 20 is composed of a composite reflecting element in which a plurality of unit reflecting elements are connected. In the present embodiment, the second reflecting element 20 includes nine unit reflecting elements 20A to 20I having the same dimensions except for the thickness. It is out. Each of the unit reflection elements 20A to 20I has a substantially flat plate shape, and has a square shape having the same size as the unit reflection elements 10A to 10I described above when viewed along the thickness direction. ing. 2 and 3, the thicknesses of the unit reflecting elements 20A to 20D and 20G are equally described for the convenience of drawing.

More specifically, the second reflecting element 20 includes the nine unit reflecting elements 20A to 20I arranged in a plane in three rows and three columns, and a plane located between the nine unit reflecting elements 20A to 20I. An adhesive layer 23 as a joint portion in the form of a lattice, and the end portions of the adjacent unit reflective elements among the nine unit reflective elements 10A to 10I are joined by the adhesive layer 23, It is formed as a composite reflecting element that is enlarged as a whole.

Each of the unit reflecting elements 20A to 20I constituting the second reflecting element 20 includes a plurality of second reflectors 21 and a plurality of second transparent bodies 22. The plurality of second reflectors 21 and the plurality of second transparent bodies 22 constituting each of the unit reflection elements 20A to 20I are alternately stacked in the second direction (vertical direction in FIG. 1).

That is, the stacking direction of the plurality of second reflectors 21 and the plurality of second transparent bodies 22 in the unit reflecting elements 20A to 20I is such that the second reflector 21 and the second transparent body 22 as a whole in the second reflecting element 20 are. All are arranged so as to face the same direction so as to have continuity. Thereby, in the 2nd reflective element 20, the several 2nd reflector 21 and the some 2nd transparent body 22 are alternately laminated | stacked and located in the said 2nd direction in the whole region.

The second reflector 21 located inside each of the unit reflection elements 20A to 20I includes a pair of reflection films 21a (see FIG. 6) and an adhesive layer 21b (see FIG. 6) located between the pair of reflection films 21a. ). The pair of reflective films 21a and the adhesive layer 21b are arranged side by side along the second direction, and the pair of reflective films 21a are joined by being in direct contact with both side surfaces of the adhesive layer 21b.

On the other hand, among the joint portions of the unit reflection elements 20A to 20I, the second reflector 21 is a pair of seams located at the portion sandwiched by the unit reflection elements in the second direction (vertical direction in FIG. 1). The reflection film 21a (see FIG. 6) and the adhesive layer 23 (see FIG. 6) positioned between the pair of reflection films 21a. The pair of reflective films 21 a and the adhesive layer 23 are arranged side by side along the second direction, and the pair of reflective films 21 a are joined by being in direct contact with both side surfaces of the adhesive layer 23.

The plurality of second reflectors 21 are arranged in parallel to each other, and each of them extends along the first direction. The plurality of second transparent bodies 22 are arranged in parallel to each other so as to fill the space between the adjacent second reflectors 21, and each of them extends along the first direction.

The pair of reflective films 21a is made of, for example, a metal such as aluminum or silver, and the adhesive layer 21b and the adhesive layer 23 are made of, for example, a cured product of an epoxy adhesive. Moreover, the 2nd transparent body 22 is comprised, for example with glass or transparent resin.

The width of each reflective film 21a in the second direction is, for example, about 50 [nm] to 200 [nm], and the individual adhesive layers 21b and the individual adhesive layers 23 in the second direction are, for example, about 50 nm to 200 nm. The width as the size is, for example, about 5 [μm] or more and 30 [μm] or less. Accordingly, the width of each second reflector 21 in the second direction is approximately the same as the width of each individual adhesive layer 21b and the width of each individual adhesive layer 23. Moreover, the width which is the magnitude | size in the said 2nd direction of each 2nd transparent body 22 is about 300 [micrometers] or more and 2000 [micrometers] or less, for example.

Here, the cross-sectional shape orthogonal to the extending direction of each of the plurality of second reflectors 21 and each of the plurality of second transparent bodies 22 (that is, the first direction) is a rectangular shape. Accordingly, the plurality of second reflectors 21 and the plurality of second transparent bodies 22 are arranged in close contact with each other in the second direction, so that the second reflective element 20 has a flat plate shape as described above. have.

By having the above configuration, the second reflective element 20 has a plurality of reflective surfaces therein. Each of the plurality of reflective surfaces is on the surface of the second reflector 21 in the portion facing the adjacent second transparent body 22 (that is, the surface of the portion of the reflective film 21a facing the second transparent body 22). Thus, two reflecting surfaces facing in opposite directions are formed for each second reflector 21.

The first reflective element 10 and the second reflective element 20 made of the composite reflective element having the configuration described above can be formed by the following method, for example.

First, a plurality of flat transparent members are prepared, and coating layers are formed on both main surfaces thereof. Here, a transparent member becomes the 1st transparent body 12 or the 2nd transparent body 22 mentioned above, For example, glass or transparent resin can be utilized suitably. The coating layer is to be the pair of reflection films 11a of the first reflector 11 or the pair of reflection films 21a of the second reflector 21, and is made of, for example, an aluminum film or a silver film. The coating film can be formed by sputtering, for example.

Next, for example, an epoxy adhesive is applied to one exposed surface (that is, the surface of one coating layer) of the transparent member whose both main surfaces are covered with the coating layer, and the transparent member is coated with the adhesive. Another transparent member is superimposed on the adhesive to cure the adhesive. As a result, the two transparent members that are overlaid are pasted together. Here, the cured adhesive becomes the adhesive layer 11b of the first reflector 11 or the adhesive layer 21b of the second reflector 21 described above.

</ RTI> By repeating this laminating operation as many times as necessary, a laminated body block is formed in which a plurality of transparent members whose both main surfaces are covered with a coating layer are laminated via an adhesive.

Next, the laminate block is sequentially cut a plurality of times along a direction orthogonal to the lamination direction of the transparent member. At that time, the member cut out from the laminated body block is thinly cut so that the outer shape of the member becomes a flat plate shape. For example, wire cutting can be used for cutting the laminated body block.

Next, the cut surface of each member cut out after cutting is polished. As a result, the polished members become unit reflecting elements 10A to 10I and 20A to 20I.

Here, in this polishing operation, the polishing of the unit reflecting elements 10A to 10I and 20A to 20I after polishing is performed according to the state of the cut surfaces of the individual members so as to have as high flatness as possible. Is made. Therefore, the unit reflection elements 10A to 10I and 20A to 20I have different thicknesses.

Next, the unit reflecting elements 10A to 10I manufactured through the above steps are arranged in a plane according to a predetermined rule, and these end portions are joined together. More specifically, the end portions of the unit reflecting elements 10A to 10I arranged side by side in a plane are joined together by, for example, an epoxy adhesive. Here, the cured adhesive is the adhesive layer 13 described above.

Further, the unit reflecting elements 20A to 20I manufactured through the above steps are arranged in a plane according to a predetermined rule, and these end portions are joined together. More specifically, the end portions of the unit reflecting elements 20A to 20I arranged side by side in a plane are joined together by, for example, an epoxy adhesive. Here, the cured adhesive is the adhesive layer 23 described above.

In manufacturing the imaging element 1 in the present embodiment, the outer main surface 10a of the first reflecting element 10 and the second reflecting element 20 are joined in the connecting step of the unit reflecting elements 10A to 10I and 20A to 20I. In order to prevent the steps from being formed on the outer main surface 20a as much as possible, a device for increasing the flatness is provided. Details thereof will be described later.

Thus, the first reflective element 10 and the second reflective element 20 made of the composite reflective element having the above-described configuration are formed. The first reflective element 10 and the second reflective element 20 have the same structure, although their orientations are different after being assembled as the imaging element 1.

As shown in FIGS. 2 and 3, the first reflecting element 10 and the second reflecting element 20 are arranged so that the inner

main surfaces

10 b and 20 b face each other, and thereby overlap each other in the thickness direction. . As a result, the first main surface 1a of the imaging element 1 is constituted by the outer main surface 10a of the first reflecting element 10, and the second main surface of the imaging element 1 is formed by the outer main surface 20a of the second reflecting element 20. 1b is configured.

Here, the first reflecting element 10 and the second reflecting element 20 are disposed so as to be opposed to each other such that the first reflector 11 and the second reflector 21 included in each of the first reflecting element 10 and the second reflecting element 20 are orthogonal to each other. As a result, a large number of minute corner reflectors are arranged in an array in the imaging element 1.

The first reflective element 10 and the second reflective element 20 are arranged with a distance in the thickness direction, and a space between the first reflective element 10 and the second reflective element 20 is formed by the translucent adhesive layer 30. Filled. The translucent adhesive layer 30 is fixed by bonding the first reflective element 10 and the second reflective element 20 by filling the space described above.

Here, as the translucent adhesive layer 30, any kind of adhesive can be used as long as it has translucency. For example, an epoxy adhesive can be used. Preferably, the translucent adhesive layer 30 has a refractive index between the refractive index of the first transparent body 12 constituting the first reflective element 10 and the refractive index of the second transparent body 22 constituting the second reflective element 20. An adhesive with a rate difference of 0.02 or less is used. In this way, unnecessary reflection, refraction, scattering, and the like can be suppressed from occurring at the interface between the translucent adhesive layer 30 and the first transparent body 12 and the second transparent body 22.

Further, the adhesive used in the above-described uniting step of the unit reflecting elements 10A to 10I and 20A to 20I has a refractive index after curing of 0.02 between the refractive index of the light-transmitting adhesive layer 30. It is preferable to use the following difference. In this case, unnecessary reflection, refraction, scattering, or the like occurs at the interface between the

adhesive layers

13 and 23 constituting the joints of the unit reflection elements 10A to 10I and 20A to 20I and the translucent adhesive layer 30. Can be suppressed. Therefore, particularly when the width of the

adhesive layers

13 and 23 is larger than that of the

adhesive layers

11b and 21b, the disturbance of light with respect to the light passing through the

adhesive layers

13 and 23 can be effectively suppressed.

FIG. 4 is a conceptual diagram showing a mechanism for displaying an aerial image by using the imaging element shown in FIG. Next, with reference to FIG. 4, a mechanism that enables an aerial image to be displayed by using the imaging element 1 in the present embodiment will be described.

As shown in FIG. 4, in order to display an aerial image using the imaging element 1 in the present embodiment, an object 100 as a projection object is formed at a spatial position on the first main surface 1 a side of the imaging element 1. Is placed.

The light emitted from the object 100 in different directions enters the first reflective element 10 via the first main surface 1a of the imaging element 1 (the outer main surface 10a of the first reflective element 10), and the light The light is reflected by the reflection surface of the first reflector 11 located in the traveling direction, and reaches the translucent adhesive layer 30 via the inner main surface 10 b of the first reflection element 10.

The light that has passed through the translucent adhesive layer 30 enters the inside of the second reflective element 20 via the inner main surface 20b of the second reflective element 20, and the second reflector 21 positioned in the traveling direction of the light. The light is reflected by the reflecting surface and reaches the outside of the imaging element 1 via the second main surface 1b of the imaging element 1 (the outer main surface 20a of the second reflecting element 20).

The light emitted to the outside of the imaging element 1 is brought into a symmetrical position of the object 100 with respect to the plane on which the imaging element 1 is arranged by the retroreflection in the first reflecting element 10 and the second reflecting element 20 described above. As a result, the real image 200 of the object 100 is imaged at a spatial position on the second principal surface 1 b side of the imaging element 1.

Note that, for example, when a liquid crystal display is arranged as the object 100, an image displayed on the liquid crystal display is displayed as an aerial image. Of course, the object 100 is not limited to a liquid crystal display, and any object may be arranged regardless of two-dimensional or three-dimensional types.

5 is an enlarged cross-sectional view of a region V shown in FIG. 2 of the imaging element shown in FIG. 1, and FIG. 6 is an enlarged cross-sectional view of a region VI shown in FIG. 3 of the imaging element shown in FIG. is there. Next, with reference to FIGS. 5 and 6, the shape in the vicinity of the joint portion of the first reflecting element 10 and the second reflecting element 20 of the imaging element 1 in the present embodiment will be described in detail.

In the first reflective element 10, a step is generated at the joint between the unit reflective elements 10A to 10I based on the difference in thickness of the unit reflective elements 10A to 10I. For example, as shown in FIG. 5, in the joint portion between the unit reflecting element _10A and the unit reflecting element 10B, the thickness T _10A of the unit reflecting element _10A is different from the thickness T _10B of the unit reflecting element 10B. There is a step in the part.

This step is the outer main surface 10a side of the first reflecting element 10, together appear as positional difference G _10a of the outer main surface and the outer principal surface of the unit reflective element 10B of the unit reflective element 10A in the thickness direction, the in the inner main surface 10b side of the first reflective element 10 appears as a positional difference G _10b of the inner main surface and the inner major surface of the unit reflective element 10B of the unit reflective element 10A in the thickness direction.

In addition, although illustration is abbreviate | omitted here, also in the other seam part contained in the 1st reflective element 10, the positional difference in the thickness direction mentioned above between the outer principal surfaces of adjacent unit reflective elements, and inner principal surfaces. Appears. Therefore, the outer main surface 10a and the inner main surface 10b of the first reflective element 10 are not completely flat when viewed microscopically, and have minute irregularities.

Here, in the imaging element 1 according to the present embodiment, the flatness of the outer main surface 10a of the first reflecting element 10 made of a composite reflecting element is higher than the flatness of the inner main surface 10b. That is, the positional difference in the thickness direction between the outer principal surfaces of the unit reflecting elements 10A to 10I constituting the first reflecting element 10 is smaller than the positional difference in the thickness direction between the inner principal surfaces.

This can be realized by mainly absorbing the difference in thickness of the unit reflecting elements 10A to 10I described above on the inner main surface 10b side of the first reflecting element 10. As a result, it is possible to further increase the flatness of the outer main surface 10a of the first reflecting element 10, thereby preventing a large step from occurring on the first main surface 1a of the imaging element 1. In some cases, the step may be ideally eliminated.

On the other hand, in the second reflecting element 20, a step is generated at the joint between the unit reflecting elements 20A to 20I based on the difference in thickness of the unit reflecting elements 20A to 20I. For example, as shown in FIG. 6, in the joint portion between the unit reflecting element _20A and the unit reflecting element 20D, the thickness T _20A of the unit reflecting element _20A is different from the thickness T _20D of the unit reflecting element 20D. There is a step in the part.

This step is the outer main surface 20a side of the second reflecting element 20, together appear as positional difference G _20a of the outer main surface and the outer principal surface of the unit reflective element 20D of unit reflective element 20A in the thickness direction, the in the inner main surface 20b side of the second reflective element 20 appears as a positional difference G _20b of the inner main surface and the inner major surface of the unit reflective element 20B of the unit reflective element 20A in the thickness direction.

In addition, although illustration is abbreviate | omitted here, also in the other seam part contained in the 2nd reflective element 20, the positional difference in the thickness direction mentioned above between the outer main surfaces of adjacent unit reflective elements, and inner main surfaces. Appears. Therefore, the outer main surface 20a and the inner main surface 20b of the second reflecting element 20 are not completely flat when viewed microscopically, and have minute irregularities.

Here, in the imaging element 1 according to the present embodiment, the flatness of the outer main surface 20a of the second reflecting element 20 made of a composite reflecting element is higher than the flatness of the inner main surface 20b. That is, the positional difference in the thickness direction between the outer principal surfaces of the unit reflecting elements 20A to 20I constituting the second reflecting element 20 is smaller than the positional difference in the thickness direction between the inner principal surfaces.

This can be realized by mainly absorbing the difference in thickness of the unit reflecting elements 20A to 20I described above on the inner main surface 20b side of the second reflecting element 20. As a result, it is possible to further increase the flatness of the outer main surface 20a of the second reflecting element 20, so that a large step does not occur on the second main surface 1b of the imaging element 1. In some cases, the step may be ideally eliminated.

Thus, in the imaging element 1 in the present embodiment, on the inner main surface 10b side of the first reflecting element 10 and the inner main surface 20b side of the second reflecting element 20 where the translucent adhesive layer 30 is located, By absorbing the difference in thickness of the unit reflection elements 10A to 10I and the difference in thickness of the unit reflection elements 20A to 20I, the first main surface 1a and the second main surface 1b of the imaging element 1 are smoothed. Therefore, there is no large step on the first main surface 1a and the second main surface 1b.

Therefore, by adopting the above configuration, it is possible to suppress or prevent the occurrence of streak-like defects in the displayed aerial image, and an imaging element capable of displaying a high-quality aerial image is obtained. be able to.

In addition, by adopting the above-described configuration, it is possible to suppress or prevent the occurrence of cracks and chips due to the above-described stepped portions, and it is also possible to prevent finger injury during handling. Therefore, the imaging element can be excellent in terms of prevention of damage and safety.

Note that there is a step in the first main surface 1a and the second main surface 1b of the imaging element 1 (that is, the outer main surface 10a of the first reflecting element 10 and the outer main surface 20a of the second reflecting element 20). Even if it exists, it is preferable that the magnitude | size of the said level | step difference (namely, the positional difference in the thickness direction of the outer side main surface of an adjacent unit reflective element) shall be 5 [micrometers] or less. If the level difference is within this range, the displayed aerial image is not greatly degraded, and is acceptable from the viewpoint of preventing breakage and safety.

On the other hand, as a result, the steps generated on the inner main surface 10b of the first reflecting element 10 and the inner main surface 20b of the second reflecting element are generally outside the outer main surface 10a of the first reflecting element 10 and the second reflecting element 20. Although it is larger than the step formed on the main surface 20a, unnecessary reflection, refraction, scattering, etc. occur at the step because the translucent adhesive layer 30 is positioned so as to cover the step as described above. Therefore, the displayed aerial image is not greatly deteriorated.

Preferably, the size of the step formed on the inner main surface 10b of the first reflecting element 10 and the inner main surface 20b of the second reflecting element 20 (that is, the positional difference between the inner main surfaces of adjacent unit reflecting elements in the thickness direction). ) Is 30 [μm] or less. This is because the thickness of the translucent adhesive layer 30 is normally about 100 [μm]. When the size of the step exceeds 30 [μm], the first reflective element 10 and the first reflective element 10 This is because it becomes an obstacle to sufficiently reduce the distance between the two reflecting elements 20.

7 to 9 are views for explaining a method of manufacturing the imaging element 1 in the present embodiment. FIG. 7A is a schematic perspective view showing a process of forming the first reflective element, and FIG. 7B is a schematic cross-sectional view taken along the line VIIB-VIIB shown in FIG. 7A. is there. FIG. 8A is a schematic perspective view showing the formation process of the second reflective element, and FIG. 8B is a schematic cross-sectional view along the line VIIIB-VIIIB shown in FIG. 8A. is there. FIG. 9A is a schematic perspective view showing the bonding process of the first reflective element and the second reflective element, and FIG. 9B is a schematic cross-sectional view after bonding. Next, a method for manufacturing the imaging element 1 in the present embodiment will be described with reference to FIGS. In FIG. 7B, FIG. 8B, and FIG. 9B, the difference in thickness of the unit reflection elements is greatly exaggerated for easy understanding.

As shown in FIG. 7, when the imaging element 1 according to the present embodiment is manufactured, the surface plate 1000 is used in the process of forming the first reflecting element 10 by connecting the unit reflecting elements 10A to 10I described above. It is done. The surface plate 1000 has a reference plane 1001 having high flatness.

First, nine unit reflecting elements 10A to 10I are arranged on the reference plane 1001 of the surface plate 1000 so as to be arranged in 3 rows and 3 columns. At this time, the unit reflection elements 10A to 10I are arranged such that the stacking directions of the plurality of first reflectors 11 and the plurality of first transparent bodies 12 of the unit reflection elements 10A to 10I are all in the same direction. In addition, a gap having a predetermined interval is provided between adjacent unit reflection elements.

Next, while maintaining this state, for example, an epoxy-based adhesive is poured along the gap (the gap indicated by the arrow P1 in FIG. 7B) between the adjacent unit reflecting elements, and then the adhesion is performed. The agent is cured. As a result, an adhesive layer 13 is formed between the adjacent unit reflection elements as a seam portion in a plan view lattice, thereby joining the ends of the adjacent unit reflection elements. As described above, the nine unit reflecting elements 10A to 10I are integrated to form a single first reflecting element 10 as a composite reflecting element.

Here, at the time of the joining, since the state where the lower surfaces of the nine unit reflecting elements 10A to 10I are in contact with the reference plane 1001 of the surface plate 1000 is maintained, the lower surfaces of the nine unit reflecting elements 10A to 10I These nine unit reflection elements 10A to 10I are joined while maintaining a high flatness following the reference plane 1001. Thereby, the flatness of the lower surface of the first reflective element 10 that is in contact with the surface plate 1000 is higher than the flatness of the upper surface of the first reflective element 10 that is not in contact with the surface plate 1000.

On the other hand, as shown in FIG. 8, the surface plate 1000 is also used in the process of forming the second reflective element 20 by connecting the unit reflective elements 20A to 20I.

Specifically, nine unit reflecting elements 20A to 20I are arranged on the reference plane 1001 of the surface plate 1000 in 3 rows and 3 columns. At this time, the unit reflection elements 20A to 20I are arranged such that the stacking directions of the plurality of second reflectors 21 and the plurality of second transparent bodies 22 of the unit reflection elements 20A to 20I are all in the same direction. In addition, a gap having a predetermined interval is provided between adjacent unit reflection elements.

Next, while maintaining this state, for example, an epoxy-based adhesive is poured along the gap described above (the gap indicated by the arrow P2 in FIG. 8B) between the adjacent unit reflecting elements, and then the adhesion is performed. The agent is cured. As a result, an adhesive layer 23 is formed between the adjacent unit reflection elements as a seam portion in a lattice pattern in plan view, whereby the ends of the adjacent unit reflection elements are joined to each other. As described above, the nine unit reflecting elements 20A to 20I are integrated to form a single second reflecting element 20 as a composite reflecting element.

Here, at the time of the joining, the state in which the lower surfaces of the nine unit reflecting elements 20A to 20I are in contact with the reference plane 1001 of the surface plate 1000 is maintained, so that the lower surfaces of the nine unit reflecting elements 20A to 20I The nine unit reflection elements 20A to 20I are joined while maintaining a high flatness following the reference plane 1001. Thereby, the flatness of the lower surface of the second reflective element 20 in contact with the surface plate 1000 becomes higher than the flatness of the upper surface of the second reflective element 20 not in contact with the surface plate 1000.

Next, as shown in FIG. 9A, the top and bottom of the second reflective element 20 are inverted, and the bottom surface of the second reflective element 20 after the inversion (that is, not touching the surface plate 1000 at the time of joining described above). And the lower surface of the second reflective element 20 after reversal, and the upper surface of the first reflective element 10 (that is, the surface that is not in contact with the surface plate 1000 at the time of joining). A state where a gap of a predetermined size is formed between the upper surface of the first reflecting element 10 and maintaining this state, for example, by pouring an epoxy adhesive into the gap and curing it, The first reflective element 10 and the second reflective element 20 are joined. Here, the adhesive after curing becomes the translucent adhesive layer 30.

In other words, in the method of manufacturing the imaging element 1 in the present embodiment, the main surface on the side disposed in contact with the surface plate 1000 in the step of forming the first reflective element 10 is the outer main surface 10a of the first reflective element 10. In addition, in the step of forming the second reflective element 20, the first reflective element 10 and the second reflective element 10 are arranged so that the main surface on the side arranged in contact with the surface plate 1000 becomes the outer main surface 20 a of the second reflective element 20. The reflective element 20 is overlapped and fixed.

As described above, as shown in FIG. 9B, the first main surface 1 a configured by the outer main surface 10 a of the first reflecting element 10 and the outer main surface 20 a of the second reflecting element 20 are configured. The imaging element 1 configured such that the two principal surfaces 1b have high flatness is manufactured.

Here, when the imaging element is manufactured according to the above-described manufacturing method, the inventors determine how many steps are generated on the first main surface and the second main surface in the manufactured imaging element, This was confirmed by actually making a prototype.

In the production, borosilicate glass (refractive index 1.52) was used as the first transparent body and the second transparent body, and an aluminum film was used as the reflective film constituting the first reflector and the second reflector. As the unit reflection element, a target with a target thickness of 1.5 [mm] and a size of 150 [mm] square is manufactured, and the pitch of the reflection surface is set to 500 [μm] as a target value. . The width of the reflective film is about 100 [nm]. Further, the width of the adhesive layer as a joint portion for joining the unit reflecting elements to each other was set to 20 [μm].

Epoxy adhesives (refractive index of 1.51) are used for the adhesive for joining the reflective films, the adhesive for joining the unit reflective elements, and the adhesive for joining the first reflective element and the second reflective element. ) Was used. The target value of the thickness of the adhesive for joining the first reflective element and the second reflective element (that is, the thickness of the translucent adhesive layer) is 100 [μm].

Based on the above conditions, nine unit reflecting elements constituting the first reflecting element were manufactured, and the thickness at the center of each unit was measured. The maximum thickness was 1.522 [mm. It was the smallest and its thickness was 1.491 [mm]. On the other hand, nine unit reflecting elements that constitute the second reflecting element were manufactured, and the thickness at the center of each unit was measured. The maximum thickness was 1.519 [mm]. The minimum thickness was 1.490 [mm].

Using these, the first reflective element and the second reflective element were formed using the above-described surface plate, and then the first reflective element and the second reflective element were further joined.

When the size (height) of the maximum portion of the step formed on the first main surface of the imaging element thus manufactured (that is, the outer main surface of the first reflecting element) was measured, the imaging element was measured. This was 1 [μm] in the thickness direction. On the other hand, when the size (height) of the maximum portion of the step formed on the second main surface of the imaging element thus manufactured (that is, the outer main surface of the second reflecting element) was measured, This was 3 [μm] in the thickness direction of the image element.

The reason why the first main surface and the second main surface of these imaging elements are slightly stepped is that the unit imaging element after polishing is slightly warped. It is considered a thing.

From the above results, the first principal surface 1a and the second principal surface 1b of the imaging element 1 are made to have very high flatness by applying the above-described manufacturing method of the imaging element 1 in the present embodiment. This can be said to be confirmed experimentally.

Here, the characteristic configuration disclosed in the above-described embodiment of the present invention is summarized as follows.

The imaging element has a first main surface and a second main surface that are positioned relative to each other in the thickness direction, and a real image of an object disposed at a spatial position on the first main surface side is on the second main surface side. An image is formed at a spatial position, and includes a flat plate-like first reflective element arranged on the first main surface side and a flat plate-like second reflective element arranged on the second main surface side. ing. The first reflective element includes a plurality of first reflectors arranged in parallel to each other so as to be aligned along a first direction orthogonal to the thickness direction, and an adjacent first of the plurality of first reflectors. A plurality of first transparent bodies filling between the reflectors. The second reflecting element includes a plurality of second reflectors arranged in parallel to each other so as to be aligned along a second direction orthogonal to both the thickness direction and the first direction, and the plurality of second reflectors. And a plurality of second transparent bodies filling between adjacent second reflectors. The first reflecting element has an inner main surface that faces the second reflecting element, and an outer main surface that is positioned opposite to the inner main surface and that defines the first main surface. The second reflecting element has an inner main surface that faces the first reflecting element, and an outer main surface that is positioned opposite to the inner main surface and that defines the second main surface. The second reflective element is composed of a composite reflective element including a plurality of flat unit reflective elements arranged side by side in a plane and a joint that joins end portions of the plurality of unit reflective elements. Yes. The flatness of the outer main surface of the second reflective element made of the composite reflective element is higher than the flatness of the inner main surface of the second reflective element made of the composite reflective element.

In the imaging element, among the plurality of unit reflection elements included in the second reflection element, the size of the step along the thickness direction in the joint portion of the adjacent unit reflection elements is the first unit. It is preferable that it is 5 [micrometers] or less in the said outer main surface side of 2 reflective elements.

In the imaging element, among the plurality of unit reflection elements included in the second reflection element, the size of the step along the thickness direction in the joint portion of the adjacent unit reflection elements is the first unit. It is preferable that it is 30 [micrometers] or less in the said inner main surface side of 2 reflective elements.

In the imaging element, it is preferable that the first reflective element and the second reflective element are bonded via a translucent adhesive layer.

In the imaging element, the difference between the refractive index of the adhesive layer that joins the first reflective element and the second reflective element and the refractive index of the second transparent body is 0.02 or less. Preferably there is.

In the imaging element, the joint portion included in the second reflective element may be formed of a light-transmitting adhesive layer. In that case, the first reflective element and the first reflective element are included. It is preferable that the difference between the refractive index of the adhesive layer that joins the two reflective elements and the refractive index of the adhesive layer that constitutes the joint included in the second reflective element is 0.02 or less.

In the imaging element, the first reflecting element includes a plurality of flat unit reflecting elements arranged in a plane, and a joint portion that joins ends of the plurality of unit reflecting elements. In this case, the flatness of the outer main surface of the first reflective element made of the composite reflective element is the first reflective element made of the composite reflective element. It is preferable that the flatness of the inner main surface is higher.

In the imaging element, in the case where the first reflective element is composed of a composite reflective element in addition to the second reflective element, among the plurality of unit reflective elements included in the first reflective element, It is preferable that the size of the step along the thickness direction in the joint portion of the adjacent unit reflecting elements is 5 [μm] or less on the outer main surface side of the first reflecting element.

In the imaging element, in the case where the first reflective element is composed of a composite reflective element in addition to the second reflective element, among the plurality of unit reflective elements included in the first reflective element, It is preferable that the size of the step along the thickness direction in the joint portion of adjacent unit reflection elements is 30 [μm] or less on the inner main surface side of the first reflection element.

In the imaging element, when the first reflective element is composed of a composite reflective element in addition to the second reflective element, the first reflective element and the second reflective element are translucent. It is preferable to be bonded via an adhesive layer.

In the imaging element, in the case where the first reflecting element is composed of a composite reflecting element in addition to the second reflecting element, the bonding for joining the first reflecting element and the second reflecting element is performed. The difference between the refractive index of the layer and the refractive index of the first transparent body is 0.02 or less, and the refractive index of the adhesive layer that joins the first reflective element and the second reflective element; The difference from the refractive index of the second transparent body is preferably 0.02 or less.

In the imaging element, when the first reflecting element is composed of a composite reflecting element in addition to the second reflecting element, the joint portion and the second reflecting element included in the first reflecting element The seam portion included in each may be formed of a translucent adhesive layer, in which case the refraction of the adhesive layer joining the first reflective element and the second reflective element The difference between the refractive index and the refractive index of the adhesive layer constituting the seam portion included in the first reflective element is 0.02 or less, and the first reflective element and the second reflective element are joined The difference between the refractive index of the adhesive layer and the refractive index of the adhesive layer constituting the joint part included in the second reflective element is preferably 0.02 or less.

An imaging element manufacturing method according to a first aspect is a manufacturing method for manufacturing the above-described imaging element, the step of forming the first reflecting element, and the plurality of the second reflecting elements. Forming the second reflective element by joining the end portions of the plurality of unit reflective elements in a state where the unit reflective elements are arranged in a plane on the surface plate, and the second reflective element is In the forming step, the first reflective element and the second reflective element are overlapped and fixed so that the main surface on the side placed in contact with the surface plate becomes the outer main surface of the second reflective element. A process.

An imaging element manufacturing method according to a second aspect is a manufacturing method for manufacturing the imaging element described above, wherein the plurality of unit reflection elements to be the first reflection element are planar on a surface plate. The end portions of the plurality of unit reflection elements are connected to each other in a state of being arranged side by side, and the step of forming the first reflection element and the plurality of unit reflection elements to be the second reflection element are arranged on a surface plate. In the state in which the end portions of the plurality of unit reflection elements are connected to each other in a state of being arranged in a plane, the step of forming the second reflection element and the step of forming the first reflection element are performed on the surface plate. The main surface on the side where the contact is arranged becomes the outer main surface of the first reflecting element, and the main surface on the side arranged in contact with the surface plate in the step of forming the second reflecting element is the second reflecting surface. The main outside of the element As a, and a step of fixing by superimposing and the first reflecting element and the second reflective element.

In the embodiment of the present invention described above, the first main surface, which is the main surface on the side where the object as the projection object is arranged, and the main surface on the side where the real image of the object is formed. Although the description has been made by exemplifying the imaging element in which both the second main surface and the second main surface are configured to have high flatness, it is not always necessary to configure in this way, and at least the second main surface among them is not necessary. What is necessary is just to be comprised so that a surface may have high flatness. With this configuration, it is possible to suppress or prevent the occurrence of streak-like defects in the displayed aerial image, and it is possible to provide an imaging element that can display a high-quality aerial image.

Thus, the above-described embodiment disclosed herein is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the scope of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Imaging element, 1a 1st main surface, 1b 2nd main surface, 10 1st reflective element, 10A-10I unit reflective element, 10a outer main surface, 10b inner main surface, 11 1st reflector, 11a reflective film, 11b adhesive layer, 12 first transparent body, 13 adhesive layer, 20 second reflective element, 20A to 20I unit reflective element, 20a outer main surface, 20b inner main surface, 21 second reflector, 21a reflective film, 21b adhesive layer 22, second transparent body, 23 adhesive layer, 30 translucent adhesive layer, 100 object, 200 real image, 1000 surface plate, 1001 reference plane.

Claims

A real image of an object having a first main surface and a second main surface positioned relative to each other in the thickness direction and disposed at a spatial position on the first main surface side is formed at a spatial position on the second main surface side An imaging element to cause
A flat plate-like first reflecting element disposed on the first main surface side;
A flat plate-like second reflective element disposed on the second main surface side,
The first reflecting element includes a plurality of first reflectors arranged in parallel to each other so as to be aligned along a first direction orthogonal to the thickness direction, and an adjacent first of the plurality of first reflectors. A plurality of first transparent bodies filling between the reflectors,
The second reflective element includes a plurality of second reflectors arranged in parallel to each other so as to be aligned along a second direction orthogonal to both the thickness direction and the first direction, and the plurality of second reflectors A plurality of second transparent bodies filling between adjacent second reflectors,
The first reflecting element has an inner main surface that faces the second reflecting element, and an outer main surface that is positioned opposite to the inner main surface and that defines the first main surface;
The second reflecting element has an inner main surface that faces the first reflecting element, and an outer main surface that is positioned opposite to the inner main surface and that defines the second main surface;
The second reflective element comprises a composite reflective element including a plurality of flat unit reflective elements arranged side by side and a joint that joins ends of the plurality of unit reflective elements,
The imaging element, wherein the flatness of the outer main surface of the second reflective element made of the composite reflective element is higher than the flatness of the inner main surface of the second reflective element made of the composite reflective element.
Among the plurality of unit reflection elements included in the second reflection element, the size of the step along the thickness direction in the joint portion of adjacent unit reflection elements is the outer main surface side of the second reflection element. The imaging element according to claim 1, which is 5 [μm] or less.
Among the plurality of unit reflection elements included in the second reflection element, the size of the step along the thickness direction in the joint portion of adjacent unit reflection elements is the inner main surface side of the second reflection element. The imaging element according to claim 1, wherein the imaging element is 30 [μm] or less.
The imaging element according to any one of claims 1 to 3, wherein the first reflective element and the second reflective element are joined together through a translucent adhesive layer.
The connection according to claim 4, wherein a difference between a refractive index of the adhesive layer that joins the first reflective element and the second reflective element and a refractive index of the second transparent body is 0.02 or less. Image element.
The seam part included in the second reflective element is composed of a translucent adhesive layer,
The difference between the refractive index of the adhesive layer that joins the first reflective element and the second reflective element and the refractive index of the adhesive layer that forms the joint included in the second reflective element is 0. The imaging element according to claim 5, which is 02 or less.
The first reflective element is composed of a composite reflective element including a plurality of flat unit reflective elements arranged side by side and a joint that joins end portions of the plurality of unit reflective elements.
The flatness of the outer main surface of the first reflective element made of the composite reflective element is higher than the flatness of the inner main surface of the first reflective element made of the composite reflective element. The imaging element according to any one of the above.
Of the plurality of unit reflection elements included in the first reflection element, the size of the step along the thickness direction in the joint portion of adjacent unit reflection elements is the outer main surface side of the first reflection element. The imaging element according to claim 7, which is 5 μm or less.
Among the plurality of unit reflection elements included in the first reflection element, the size of the step along the thickness direction in the joint portion of adjacent unit reflection elements is the inner main surface side of the first reflection element. The imaging element according to claim 7, wherein the imaging element is 30 μm or less.
The imaging element according to any one of claims 7 to 9, wherein the first reflective element and the second reflective element are joined together through a translucent adhesive layer.
The difference between the refractive index of the adhesive layer that joins the first reflective element and the second reflective element and the refractive index of the first transparent body is 0.02 or less,
The connection according to claim 10, wherein a difference between a refractive index of the adhesive layer that joins the first reflective element and the second reflective element and a refractive index of the second transparent body is 0.02 or less. Image element.
The seam part included in the first reflective element and the seam part included in the second reflective element are both composed of a translucent adhesive layer,
The difference between the refractive index of the adhesive layer that joins the first reflective element and the second reflective element and the refractive index of the adhesive layer that constitutes the joint included in the first reflective element is 0. 02 or less,
The difference between the refractive index of the adhesive layer that joins the first reflective element and the second reflective element and the refractive index of the adhesive layer that forms the joint included in the second reflective element is 0. The imaging element according to claim 11, which is 02 or less.
A manufacturing method for manufacturing the imaging element according to claim 1,
Forming the first reflective element;
The second reflective elements are formed by connecting the end portions of the plurality of unit reflective elements in a state where the plurality of unit reflective elements to be the second reflective elements are arranged in a plane on a surface plate. Process,
In the step of forming the second reflecting element, the first reflecting element and the second reflecting element are arranged such that the main surface on the side arranged in contact with the surface plate becomes the outer main surface of the second reflecting element. A method for manufacturing an imaging element, comprising the step of superimposing and fixing.
A manufacturing method for manufacturing the imaging element according to any one of claims 7 to 12,
The first reflecting elements are formed by connecting the end portions of the plurality of unit reflecting elements in a state where the plurality of unit reflecting elements to be the first reflecting elements are arranged in a plane on a surface plate. Process,
The second reflective elements are formed by connecting the end portions of the plurality of unit reflective elements in a state where the plurality of unit reflective elements to be the second reflective elements are arranged in a plane on a surface plate. Process,
In the step of forming the first reflective element, the main surface on the side arranged in contact with the surface plate becomes the outer main surface of the first reflective element, and in the step of forming the second reflective element, the surface plate And a step of superimposing and fixing the first reflective element and the second reflective element so that the main surface on the side disposed in contact with the second reflective element is the outer main surface of the second reflective element. Manufacturing method of image element.