JP2009276699A - Dihedral corner reflector array - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dihedral corner reflector array, manufactured at a low cost by a simple method, and preventing deterioration of imaging performance. <P>SOLUTION: This dihedral corner reflector array includes: a first member 2A having a plurality of first mirror surfaces 21Aa having a longitudinal dimension in one direction and arranged in parallel in the same direction; and a second member 3A having a plurality of second mirror surfaces 31Aa having a longitudinal dimension in one direction and arranged in parallel in the same direction. The first member 2A and the second member 3A are superposed so that each first mirror surface 21Aa and each second mirror surface 31Aa make a substantially right-angle. In an area A partitioned by the two adjacent first mirror surfaces 21Aa and the two second mirror surfaces 31Aa, a set of dihedral corner reflector 4A is constructed by a first mirror surface element 21Aax which is a small area in one first mirror surface 21Aa and a second mirror surface element 31Aax which is a small area in one second mirror surface 31Aa. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of a two-surface corner reflector array that is an imaging optical element provided with a large number of two-surface corner reflectors composed of two mirror surfaces substantially orthogonal to each other.

  2. Description of the Related Art Conventionally, an aspect using, for example, a convex lens or a concave mirror is known as an optical element used to form a three-dimensional or two-dimensional object or image as a real image at a spatially moved position. However, in order to meet the demand for ensuring an appropriate viewing angle, an optical element with a large width is required, and on the other hand, it is difficult to use an optical element with a short focal length due to aberrations and other problems. However, the depth dimension of the optical system also becomes long, and there is a problem that the device using the optical element becomes enormous, and consequently the display device itself using the optical element increases in size. Further, even if the device is enlarged, it is difficult to completely eliminate the aberration. When the viewpoint is changed, the spatial position of the real image changes and the image with respect to the three-dimensional object is distorted.

The inventor has so far proposed a dihedral corner reflector array as an imaging optical element provided with a large number of dihedral corner reflectors composed of two substantially orthogonal mirror surfaces (see Patent Document 1). Each of the two-surface corner reflectors is configured so that light emitted from a projection object (including a two-dimensional or three-dimensional object or image) arranged on one side of the element surface is used for each of the two-surface corner reflectors. A mirror image of the projection object is reflected in the space on the other side of the element surface (hereinafter referred to as “real mirror image” as necessary) by transmitting the element surface while reflecting it twice in total, once on the mirror surface. ) At the same magnification and without distortion, and a two-dimensional real image can be observed if the projection object is two-dimensional, and a three-dimensional real image can be observed if the projection object is three-dimensional. is there.
WO2007 / 116639 International Publication

  By the way, in the above-described two-surface corner reflector array, in order to form a fine real mirror image, each of the two mirror surfaces constituting each two-surface corner reflector has a side of, for example, 1 mm or less, preferably 50 to 50 mm. In addition to the extremely small size of 200 μm, the two mirror surfaces must be kept facing each other at an angle of approximately 90 degrees.

  In order to manufacture such a two-sided corner reflector array, for example, it is conceivable to use a mold having a large number of convex or concave shapes corresponding to each two-sided corner reflector. In order to remove the product from the mold, the minute two-sided corner reflector and the minute convex or concave shape of the mold are firmly meshed with each other, so the mold must be melted each time. High cost is expected.

  In view of such problems, the present invention can be manufactured by a simple method at a low cost so as to cope with mass production and practical use of a two-sided corner reflector array, and does not involve a decrease in imaging performance. An attempt is made to provide a two-sided corner reflector array of construction.

  That is, the two-surface corner reflector array of the present invention includes a first member having a plurality of elongated first mirror surfaces having a longitudinal dimension in one direction and arranged in parallel in the same direction, and an elongated second mirror surface having a longitudinal dimension in one direction. A plurality of second members arranged in parallel in the same direction, and the first member and the second member are overlapped so that each first mirror surface and each second mirror surface are substantially perpendicular to each other. The first mirror surface element, which is a small region of one first mirror surface, and one second mirror surface in a region defined by two adjacent first mirror surfaces and two adjacent second mirror surfaces A pair of two-surface corner reflectors is constituted by the second mirror surface element which is a small region in FIG.

  Here, “substantially perpendicular” means not only 90 degrees but also an angular range of several degrees before and after that can be regarded as approximately 90 degrees, for example, 90 degrees ± 3 minutes.

  In such a case, the first member and the second member are adjacent to each other between the two adjacent first mirror surfaces by overlapping each first mirror surface and each second mirror surface so as to form a substantially right angle. A region partitioned by the two second mirror surfaces is formed in a lattice shape, and a two-surface corner reflector made up of a pair of mirror surfaces can be formed in each region. Therefore, it is not necessary to remove the product of the two-sided corner reflector array from the mold as in the prior art, and a two-sided corner reflector array having a plurality of two-sided corner reflectors can be manufactured by a low-cost and simple method. .

  In order to reduce or eliminate stray light due to multiple reflected light that causes light passing through each region to be reflected three times or more, the back side of each first mirror surface and each second mirror surface may be non-mirror surfaces.

  As a specific mode in which the structure of the first member and the second member is simplified and the imaging performance is not deteriorated, the first member and the second member are arranged on the first surface. A plurality of first and second mirror bodies having a thin plate shape or a columnar shape having a mirror surface and a second mirror surface, and a first base and a second base that support the first mirror body and the second mirror body side by side in parallel. Two bases, an aspect in which the first base and the second base are arranged facing each other so that the first mirror body and the second mirror body are adjacent to each other, and the first member and the second member, An embodiment is a transparent plate-like member in which a plurality of elongated grooves both having a longitudinal dimension in one direction are engraved in parallel.

  Of the above-mentioned two types of modes, the latter mode, that is, when the first member and the second member are transparent plate members each having a plurality of elongated grooves having a longitudinal dimension in one direction, When the material for forming the mirror is not put in the groove, the groove itself can be used as the first mirror surface and the second mirror surface that totally reflect the light. On the other hand, in the groove formed in the first member and the second member May be filled with a light-reflective material, and the groove filled with the material may be made to function positively with the first mirror surface and the second mirror surface.

  As described above, according to the present invention, a dihedral corner reflector array can be manufactured by a low-cost and simple method, and it is possible to cope with mass production and practical use. It can be of a configuration that is not accompanied.

  Embodiments of the present invention will be described below with reference to the drawings. First, the two-surface corner reflector array 1 according to the present embodiment is a two-surface corner reflector array 1 including a large number of two-surface corner reflectors 4 composed of two mirror surfaces 21a and 31a substantially orthogonal to each other. 1 and 2 schematically show the two-surface corner reflector array 1. In each of these drawings, the two-surface corner reflector 4 is very small compared to the entire two-surface corner reflector array 1, and therefore the entire set of the two-surface corner reflectors 4 is represented in gray, and the direction of the inner angle is V-shaped. It is represented by As shown in each of these drawings, the two-surface corner reflector array 1 uses a mirror image P of a projection P arranged in a space on one side (lower side in the illustrated example) with respect to the element surface S as a real image ( Hereinafter, the image is referred to as “real mirror image P”) and is formed in a plane-symmetrical position with respect to the element surface S. In FIG. 1, for example, a two-dimensional projection object O in which the character “A” is turned upside down is adopted, and the real mirror image P is displayed at the plane symmetry position with respect to the element surface S of the projection object O. The image is shown as an attitude character “A”. In FIG. 2, as the three-dimensional projection object O, for example, the one in which the letter “F” is displayed upside down on the outer peripheral surface of a cylinder is adopted, and the plane symmetry position of the projection object O with respect to the element surface S is adopted. 3 shows a state in which a real mirror image P is formed by imaging a character “F” having a correct vertical position on the inner peripheral surface of a cylinder. These real mirror images P can be observed from the start point V in the space opposite to the projection object O with respect to the element surface S. Such an image forming action by the two-surface corner reflector array 1 is as shown in FIG. 3, when light is transmitted from one side of the element surface S to the other side in each of the two-surface corner reflectors 4. The light emitted from the projection object O is obtained by reflecting on one mirror surface 21a (or 31a) and further reflecting on the other mirror surface 31a (21a). Hereinafter, specific examples of the present embodiment will be described in detail.

  First Embodiment A two-surface corner reflector array 1A according to the first embodiment is shown in FIG. 4 (perspective view), FIG. 5 (side view seen from the direction of arrow X in FIG. 4), and FIG. 6 (arrow Y in FIG. 4). As shown in FIG. 7 (plan view), a first member 2A having a plurality of elongated first mirror surfaces 21Aa having a longitudinal dimension in one direction and arranged in parallel in the same direction, and one direction And a second member 3A having a plurality of elongated second mirror surfaces 31Aa arranged in parallel in the same direction so that each first mirror surface 21Aa and each front second mirror surface 31Aa are substantially perpendicular to each other. The first member 2A and the second member 3A are arranged so as to overlap each other. The first member 2A and the second member 3A are members having substantially the same configuration. In the present embodiment, the first member 2A is disposed on the lower side, and the second member 3A is disposed on the upper side. Then, as shown schematically in FIG. 8 in which a part of FIG. 7 is enlarged, a substantially square shape in plan view partitioned by two adjacent first mirror surfaces 21Aa and two adjacent second mirror surfaces 31Aa. In each region A, one set is formed by a combination of a first mirror surface element 21Aax, which is a small region of the first mirror surface 21Aa that is substantially orthogonal to each other at a different height, and a second mirror surface element 31Aax, which is a small region of the second mirror surface 31Aa. The two-surface corner reflector 4A is configured, passes through the boundary between the first mirror surface element 21Aax and the second mirror surface element 31Aax, and is substantially perpendicular to each mirror surface element (first mirror surface element 21Aax, second mirror surface element 31Aax). The plane is the element surface SA, and the real mirror image P of the projection object O is imaged at a plane-symmetrical position of the projection object with respect to the element surface SA.

  The first member 2A is mainly formed of a plurality of first mirror bodies 21A having a substantially quadrangular prism shape and having a first mirror surface 21Aa formed on one surface (front surface in the present embodiment), and the plurality of first mirror bodies 21A. The first base 22A is arranged in parallel and supported.

  The first mirror body 21A is made of an opaque material and forms a first mirror surface 21Aa that functions as one reflecting surface of the two-surface corner reflector 4A by applying a mirror surface treatment to only the front surface. The upper surface and the lower surface are not mirror-finished, and these surfaces are non-mirror surfaces that cannot be reflected. Suitable materials for the first mirror body 21A include a stainless steel quadrangular column, a metal or molded product quadrangular column, or a metal quadrangular column. Further, examples of the mirror surface treatment include vapor deposition treatment in which a metal such as aluminum or nickel is deposited in a film shape, polishing treatment, plating treatment, or sputtering. In the present embodiment, the height and depth of the first mirror body 21A are each set to 0.5 mm or less, specifically 250 μm. The smaller the depth dimension, the larger the number of first members 2A and second members 3A that can be arranged. Therefore, the first mirror surface 21Aa and the second mirror surface 31Aa are respectively composed of a first base 22A and a second base 32A (described later). As long as the first member 2A and the second member 3A can be arranged so as to be perpendicular to each other, it is advantageous for improving the resolution. In each first mirror body 21A, the perpendicularity between the first mirror surface 21Aa and the supported surface 22a (upward surface in the present embodiment) of the first base 22A described below satisfies 90 ° ± 3 minutes. It is desirable.

  The first base 22A is a thin plate having a thickness of several millimeters made of a transparent material such as acrylic. In the present embodiment, the first base 22A has a square shape in plan view with sides of about 50 cm. However, the thickness and planar dimensions of the first base 22A are not limited to these and are required. It can be set as appropriate according to the display capability, application, and the like. The downward surface of the first base 22A functions as a support surface 22Aa that supports the first mirror body 21A.

  In the present embodiment, the longitudinal dimension of the first mirror body 21A is set slightly smaller than one side of the first base 22A, that is, the width dimension or the longitudinal depth dimension, and the longitudinal direction of each first mirror body 21A is the first base 22A. A plurality of first mirror bodies 21A are arranged on the support surface 22a at predetermined pitches (for example, at a pitch of about twice the height of the first mirror body 21A) so as to be parallel to one side. What is necessary is just to set suitably the dimension of each part of this pitch and 21 A of 1st mirror bodies according to the use of the 2 side corner reflector array 1A, the required brightness, resolution, etc. Here, in FIG. 3 and the like, the first mirror surface element 21Aax and the second mirror surface element 31Aax are both set to have an aspect ratio of about 1: 2. However, in order to achieve good brightness and resolution, It is desirable to set and adjust the dimensions of each part so that the aspect ratio of the first mirror surface element 21Aax and the second mirror surface element 31Aax is about 1: 1.

  Here, the first member 2A according to the present embodiment can be provided with a member (not shown) for aligning and fixing the plurality of first mirror bodies 21A to the first base 22A. As such a member, for example, a long plate-like member arranged along two opposing sides of the first base 22A is applied, and the longitudinal directions of these plate-like members and the first mirror body 21A are substantially the same. What is necessary is just to arrange | position several 1st mirror bodies 21A between plate-shaped members so that it may orthogonally cross. In addition, slits capable of fitting the end portions of the first mirror body 21A along the longitudinal direction are formed in such a long member at a predetermined pitch, and the first mirror body 21A is inserted into each slit. Accordingly, the first mirror body 21A may be positioned.

  On the other hand, the second member 3A has substantially the same structure as the first member 2, and the second mirror surface 31Aa is formed on one surface (the front surface in the present embodiment) like the first mirror body 21A. The second mirror 31A having a quadrangular prism shape and a second base 32A that supports the plurality of second mirrors 31A in parallel are provided. The specific configurations of the second mirror 31A and the second base 32A are substantially the same as those of the first mirror 21A and the first base 22A of the first member 2A, respectively, and thus detailed description thereof is omitted.

  The two-surface corner reflector array 1A configured using the first member 2A and the second member 3A has a first mirror surface A21a of the first member 2 and a second mirror surface A31a of the second member 3. The first member 2A and the second member 3A are made to overlap each other so as to form a substantially right angle. In the present embodiment, “substantially perpendicular” means an angle range of 90 degrees ± 3 minutes.

  In a state where the first member 2A and the second member 3A are overlapped, a substantially square shape in plan view defined by two adjacent first mirror surfaces 21Aa and 21Aa and two adjacent second mirror surfaces 31Aa and 31Aa. A plurality of shaped regions A are formed. Each first mirror surface 21Aa can be regarded as being divided into a plurality of small regions by a plurality of second mirror surfaces 31Aa that are substantially orthogonal to each other in plan view along the longitudinal direction. Similarly, each second mirror surface 31Aa has a longitudinal It can be considered that it is divided into a plurality of small regions by a plurality of first mirror surfaces 21Aa substantially orthogonal to each other in plan view along the method. Assuming that each of the small regions is “first mirror surface element 21Aax” and “second mirror surface element 31Aax”, the region A partitioned by two adjacent first mirror surfaces 21Aa and two adjacent second mirror surfaces 31Aa. Inside, one first mirror surface element 21Aax and one second mirror surface element 31Aax form a substantially right angle and are adjacent to each other in the height direction, and one set is formed by these first mirror surface element 21Aax and second mirror surface element 31Aax. The two-surface corner reflector 4A is configured. In each region A, the first mirror surface element 21Aax, the back surface of the first mirror body 21A facing the second mirror surface element 31Aax, and the back surface of the second mirror body 31A are non-mirror surfaces. In this case, only the first mirror surface element 21Aax and the second mirror surface element 31Aax that are adjacent to each other at right angles function as reflection surfaces, and the light that passes through each region A is prevented from stray light due to multiple reflections that are reflected three times or more. is doing. All the two-surface corner reflectors 4A have the same internal angles formed by the first mirror surface element 21Aax and the second mirror surface element 31Aax adjacent to each other at a substantially right angle. When the direction of the inner angle between the first mirror surface element 21Aax and the second mirror surface element 31Aax is the direction (direction) of the two-surface corner reflector 4A, in the present embodiment, all the two-surface corner reflectors 4A include the first base 22A and the first mirror surface element 4A. The two bases 32A face in the same direction at approximately 45 degrees with respect to the sides. Since the first base 22A and the second base 32A are made of a transparent material, the functions of the two-surface corner reflectors 4A are not inhibited by these bases (the first base 22A and the second base 32A).

  In the two-surface corner reflector array 1A thus manufactured, a common plane passing through the boundary portion between the first mirror surface element 21Aax and the second mirror surface element 31Aax is defined as an element surface SA, and a space on one side of the element surface SA is formed. When the light emitted from the placed projection object O passes through the region A defined by the two adjacent first mirror surfaces 21Aa and the two adjacent second mirror surfaces 31Aa, FIG. As shown in the generalized schematic diagram, the first mirror surface element 21Aax and the second mirror surface element 31Aax of the two-surface corner reflector 4A reflect each time twice in total, thereby allowing the projection object O to the element surface SA to be reflected. The real mirror image P is imaged at a plane symmetry position, and can be observed from the start point V set in the space on the same side as the real mirror image P with respect to the element surface SA. In the present embodiment, since all the two-surface corner reflectors 4A are directed to substantially 45 degrees with respect to the sides of the first base 22A and the second base 32A, for the observer above the angle (FIG. 1). The view from the direction of the arrow in FIG. 2 is the front center. The first member 2A is disposed on the first base 22A, and the second member 3A is disposed on the second base 32A on the condition that the first mirror surface 21Aa and the second mirror surface 31Aa are orthogonal to each other. Each longitudinal direction of 2A and the second member 3A is a predetermined angle that is not parallel to either the width direction or the depth direction of the first base 22A and the second base 32A, for example, the width direction and the depth direction of the bases 22A, 32A. The observation direction can be changed by adopting an aspect in which the angle is 45 degrees.

  As described above, the two-surface corner reflector 1A according to the present embodiment overlaps the first member 2A and the second member 3A so that the first mirror surfaces 21Aa and the second mirror surfaces 31Aa are substantially perpendicular to each other. A region A defined by two adjacent first mirror surfaces 21Aa and 21Aa and two adjacent second mirror surfaces 31Aa and 31Aa is formed in a lattice shape, and one set of first mirror surfaces is formed in each region A. A two-surface corner reflector 4A composed of 21Aa and the second mirror surface 31Aa can be configured. Therefore, there is no need to produce a dedicated mold for producing a two-sided corner reflector array as in the prior art, so that it is possible to eliminate the trouble of removing the mold from the mold, realizing a reduction in cost, A two-sided corner reflector array 1A having a plurality of two-sided corner reflectors 4A with good imaging performance can be obtained by a simple method.

  In the above embodiment, the first mirror body and the second mirror body are columnar ones having the first mirror surface and the second mirror surface formed on one surface. However, as the first mirror body and the second mirror body, A thin plate having a first mirror surface and a second mirror surface formed on one surface may be applied. In this case, stray light in each region can be suppressed if the back side of each mirror surface is a non-mirror surface.

  Second Embodiment As shown in FIG. 3, the two-surface corner reflector array 1B according to the second embodiment is symmetrical with the element surface SB based on substantially the same principle as the two-surface corner reflector array 1A according to the first embodiment. As the plane, the real mirror image P of the projection object O is formed at a plane-symmetrical position, and FIG. 9 (schematic perspective view) and FIG. 10 (side view seen from the direction of arrow X in FIG. 9). As shown in FIG. 11 (side view in the direction of arrow Y in FIG. 4) and FIG. 12 (schematic plan view), the first member 2B and the second member 3B both have longitudinal dimensions in one direction. The difference is that a pair of transparent plate-like members 22B and 32B each having a plurality of elongated grooves 21B and 31B carved in parallel are applied.

  Each of the plate-like members 22B and 32B is a flat plate having a thickness of several mm made of a transparent material such as acrylic. In the present embodiment, as the plate-like members 22B and 32B, those having a square shape in plan view each having a side of about 50 cm are applied, but the thickness and the planar dimensions can be appropriately set without being limited thereto.

  Each plate-like member 22B, 32B is provided with elongated grooves 21B, 31B whose longitudinal direction is parallel to one side at a predetermined pitch. Each groove 21B, 31B is formed by cutting, and the width of each groove 21B, 31B is set to 10 μm or less, specifically 250 μm. FIG. 13 is a schematic enlarged vertical sectional view (the first member 2B and the second member 3B have the same configuration, and therefore a common lead wire is attached to the same location and corresponds to the first member 2B of the second member 3B). As shown as (indicated by reference numerals in parentheses), the grooves 21B and 31B formed in the respective plate-like members 22B and 32B are hollow, and one of the rising surfaces 21Ba and 31Ba extending in the longitudinal direction thereof. The other upright surfaces 21Bb and 31Bb are non-smooth surfaces. By doing in this way, in this embodiment, the standing surfaces 21Ba and 31Ba of the grooves 21B and 31B are made to function as mirror surfaces that totally reflect light rays. The non-smooth standing surfaces 21Bb and 31Bb do not function as mirror surfaces because the impinging light is irregularly reflected. Hereinafter, the standing surface 21Ba is referred to as a first mirror surface, and the standing surface 31Ba is referred to as a second mirror surface as necessary.

  As described above, the two-surface corner reflector array 1B using the first member 2B and the second member 3B each composed of the pair of plate-like members 22B and 32B in which the grooves 21B and 31B are respectively engraved is formed in one plate-like shape. The upright surface 21Ba of the groove 21B functioning as the first mirror surface provided on the member 22B and the upright surface 31Ba of the groove 31B functioning as the second mirror surface provided on the other plate member 32B are substantially perpendicular to each other. The pair of plate-like members 22B and 32B are manufactured by overlapping each other.

  In a state where the plate-like members 22B and 32B are overlapped, the first mirror surfaces 21Ba and 21Ba of the two adjacent grooves 21B and 21B, and the second mirror surfaces 31Ba and 31Ba of the two adjacent grooves 31B and 31B, respectively. A plurality of regions B having a substantially square shape in plan view partitioned by each other are formed. Each first mirror surface 21Ba can be regarded as being divided into a plurality of small regions by a plurality of second mirror surfaces 31Ba that are substantially orthogonal to each other in plan view along the longitudinal direction. Similarly, each second mirror surface 31Ba has a longitudinal It can be considered that it is divided into a plurality of small regions by a plurality of first mirror surfaces 21Ba that are substantially orthogonal to each other in plan view along the direction. When each of the small regions is defined as “first mirror surface element 21Bax” and “second mirror surface element 31Bax”, as shown in a schematic enlarged cross-sectional view in FIG. 12 and a schematic enlarged plan view in FIG. In the region B defined by the two first mirror surfaces 21Ba and 21Ba and the two adjacent second mirror surfaces 31Ba and 31Ba, the first mirror surface element 21Bax and the first mirror surface element 21Bax which are adjacent to each other in the height direction at a substantially right angle. A pair of two-surface corner reflectors 4B is configured by the two mirror surface elements 31Bax. Accordingly, the inner angles formed by the first mirror surface element 21Bax and the second mirror surface element 31Bax that are vertically adjacent to each other at substantially right angles are all in the same direction, and in this embodiment, all the two-surface corner reflectors 4B are disposed on the plate-like members 22B and 31B. It faces in the same direction, which is almost 45 degrees to the side.

  The two-surface corner reflector array 1B thus manufactured is arranged in a space on one side of the element surface SB, with the common plane passing through the boundary between the first mirror surface 21Ba and the second mirror surface 31Ba as the element surface SB. When the light emitted from the projection object O passes through the region B defined by two adjacent first mirror surfaces 21Ba and 21Ba and two adjacent second mirror surfaces 31Ba and 31Ba, 2 The actual mirror image P is connected to the surface symmetry position of the projection object O with respect to the element surface SB by reflecting twice in total, once each at the first mirror surface element 21Bax and the second mirror surface element 31Bax constituting the surface corner reflector 4B. The image can be observed from the same space as the real mirror image P with respect to the element surface SB. In the present embodiment, since all the two-surface corner reflectors 4B are directed to substantially 45 degrees with respect to the sides of the plate-like members 22B and 32B, for the observer, the angle (in FIGS. 1 and 2). The view from the direction of the arrow is the front center. The grooves 21B and 31B are formed in the plate-like members 22B and 32B on the condition that the first mirror surface 21Ba and the second mirror surface 31Ba formed in the grooves 21B and 31B are orthogonal to each other. Each longitudinal direction of the plate-like members 22B and 32B is not parallel to either the width direction or the front-rear depth direction, for example, 45 degrees with respect to the width direction and front-rear depth direction of the plate-like members 22B and 32B. By adopting the mode described above, it is possible to change the observation direction.

  Thus, the two-surface corner reflector array 1B according to the second embodiment can obtain substantially the same operational effects as the two-surface corner reflector array 1A of the first embodiment, and further, the first member 2B and the second member. The two-sided corner reflector with a small number of parts also applies to the transparent plate-like members 22B and 32B in which a plurality of elongated grooves 21B and 31B each having a longitudinal dimension in one direction are engraved in parallel as 3B. The array 1B can be manufactured very easily, and the same effect as that according to the first embodiment can be obtained in that it can be applied to mass production and practical use.

  In the above embodiment, an example of the two-surface corner reflector 4B in which the rising surfaces 21Ba and 31Ba of the grooves 21B and 31B formed in the plate-like members 22B and 32B are used as mirror surfaces using total reflection is shown. As shown in FIG. 15 as a schematic enlarged longitudinal sectional view similar to FIG. 14, each groove 21B, 31B is filled with a light-reflective material 5B, so that these grooves are respectively formed into the first mirror surface and the first mirror surface. Two mirror surfaces are also possible. In order to make the grooves 21B and 31B mirror surfaces, for example, a mirror surface may be formed by a technique such as vapor deposition or sputtering of a material such as aluminum, nickel, or mercury. Further, as shown in FIG. 16 as a schematic enlarged vertical sectional view similar to FIG. 14, in order to make the back side of the mirror surface non-mirror surface, another groove 23B, adjacent to these grooves 21B and 31B, respectively. 33B is formed on the plate-like members 22B and 32B, and the grooves 23B and 33B are filled with, for example, a light-absorbing material 6B such as an anti-reflection paint or a coating film, or the surface roughness on the back side of the mirror surface is set. It is good also as a structure which roughens and produces irregular reflection.

  In addition, the present invention is not limited to the above-described embodiments, and the specific configuration of each part is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. It is.

The figure which shows typically an example of the imaging style by the 2 surface corner reflector array which concerns on embodiment of this invention. The figure which shows typically an example of the imaging style by the 2 surface corner reflector array which concerns on embodiment of this invention. The figure which shows typically the state of the reflection of the light ray by the one surface corner reflector in the same 2 surface corner reflector array. The perspective view which shows typically the 2 surface corner reflector array which concerns on 1st Embodiment. The typical side view which looked at the same 2 side corner reflector array from the X direction shown in FIG. The typical side view which looked at the same 2 side corner reflector array from the Y direction shown in FIG. The top view which shows typically the 2nd surface corner reflector array. The typical top view which expands and shows a part of FIG. The perspective view which shows typically the 2 surface corner reflector array which concerns on 1st Embodiment. The typical side view which looked at the same 2 side corner reflector array from the X direction shown in FIG. The typical side view which looked at the same 2 side corner reflector array from the Y direction shown in FIG. The top view which shows typically the 2nd surface corner reflector array. The longitudinal cross-sectional view which expands and schematically shows a part of the same 2 side corner reflector array. The top view which expands and schematically shows a part of the same 2 side corner reflector array. The longitudinal cross-sectional view which expands and schematically shows a part of modification of the 2nd face corner reflector array. The longitudinal cross-sectional view which expands and schematically shows a part of modification of the 2nd face corner reflector array.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A, 2A ... Two-surface corner reflector array 2, 2A, 3B ... 1st member 21A, 21B ... 1st mirror body 21a, 21Aa, 21Ba ... 1st mirror surface 21Aax, 21Bax ... 1st mirror surface element 22A ... 1st base 3, 3A, 3B ... 2nd member 31a, 31Aa, 31Ba ... 2nd mirror surface 31Aax, 31Bax ... 2nd mirror surface element 31A ... 2nd mirror body 32A, 32B ... 2nd base 4, 4A, 4B ... 2 side corner reflector 22B 32B ... Plate-like members 21B, 31B ... Grooves S, SA, SB ... Element surface

Claims (5)

A first member having a plurality of elongated first mirror surfaces having longitudinal dimensions in one direction and arranged in parallel in the same direction;
A second member having a plurality of elongated second mirror surfaces having longitudinal dimensions in one direction and arranged in parallel in the same direction;
The first member and the second member are arranged so as to overlap each other so that each first mirror surface and each second mirror surface are substantially perpendicular to each other,
In a region defined by two adjacent first mirror surfaces and two adjacent second mirror surfaces, a first mirror surface element that is a small region of one first mirror surface and one second mirror surface A two-sided corner reflector array comprising a pair of two-sided corner reflectors with a second mirror surface element that is a small area. 2. The two-surface corner reflector array according to claim 1, wherein a back surface side of each of the first mirror surfaces and each of the second mirror surfaces is a non-mirror surface. The first member and the second member include a plurality of first and second mirror bodies each having a thin plate shape or a column shape in which the first mirror surface and the second mirror surface are formed on one surface, and each first mirror. A first base and a second base for supporting the body and each second mirror in parallel with each other, and the first base so that the first mirror and the second mirror are adjacent to each other. The two-surface corner reflector array according to claim 1, wherein the second base and the second base are arranged facing each other. 3. The two-surface corner reflector according to claim 1, wherein each of the first member and the second member is a transparent plate member in which a plurality of elongated grooves having a longitudinal dimension in one direction are engraved in parallel. array. The groove formed in the first member and the second member is filled with a light-reflective material, and the groove filled with the material is used as the first mirror surface and the second mirror surface. 5. A two-sided corner reflector array as described in 4 above.

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