JP2009053263A - Optical control element and panel, and optical control device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical control element capable of obtaining clear and bright optical images without generating deformation, and to provide an optical control panel using the same. <P>SOLUTION: The optical control element 11 arranged to face paraboloidal mirrors 14, 15 by being matched with an optical axes L is provided with an incoming light hole 12 in the center of a bottom part of one paraboloidal mirror 14 and an outgoing light hole 13 in the center of a bottom part of the other paraboloidal mirror 15 respectively wherein the focal points of the paraboloidal mirrors 14, 15 are at the bottom center of the facing paraboloidal mirrors 15, 14, respectively. In addition, the optical control panel 10 arranges the optical control element 11 to juxtapose the optical axes L of the optical control element 11 on a plane toward a prescribed direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a light control element that receives scattered light from an object and emits it from one point, and uses this light control element to converge the scattered light from the object to one point so that an optical image of the object is located at another position. And a light control device that forms an optical image of an object as a stereoscopic image at another position using the light control panel.

As a light control panel that uses a light control element that receives light emitted from an object and emits it from a single point, the side surface of a transparent glassy short cylindrical body is mirror-finished to make the inside a reflective surface A cylindrical reflecting element formed with a small light-transmitting hole (for example, an inner diameter of about 1/100 to 1/5 of the diameter of a cylindrical body) in the center of one end surface and covered with a light-impermeable sheet has an optical axis There has been proposed a light control panel that is arranged on a plane without a gap so as to be parallel (see, for example, Patent Document 1).

JP-A-10-239507

However, in Patent Document 1, since the minute light transmitting hole has a finite size, light beams having different incident angles that have passed through the minute light transmitting hole are reflected at different positions in the axial direction of the side circumferential surface of the cylindrical reflecting element. . For this reason, in the light control panel constituted by the cylindrical reflection elements, the reflected light is converged at a plurality of points, which causes a problem that the optical image becomes unclear (the optical image is blurred). In addition, since the image is formed using only the light that has passed through the minute light transmitting holes, there is a problem that the amount of light passing through the light control panel is reduced and the optical image becomes dark. Furthermore, when a light beam having a certain thickness that has passed through the minute light transmitting hole is incident on the side peripheral surface and reflected, the reflection in the plane perpendicular to the optical axis of the cylindrical reflection element is the reflection on the inner circumferential surface (concave surface). For this reason, the reflected light spreads (increases the reflection angle) in a plane orthogonal to the optical axis of the cylindrical reflection element, causing a problem that the obtained optical image is distorted.

The present invention has been made in view of such circumstances, and provides a light control element, a light control panel, and a light control device using the light control element that can obtain a clear, bright, and distortion-free optical image. Objective.

The light control element according to the first invention that meets the above-mentioned object is a light control element in which the parabolic mirrors are arranged facing the optical axis,
The focal point of each of the parabolic mirrors is at the bottom center of the parabolic mirror on the opposite side, and a light incident hole is formed at the center of the bottom of one of the parabolic mirrors, and the other parabolic surface. A light exit hole is provided in the center of the bottom of the mirror.

In the light control element according to the first aspect of the present invention, optical lenses are respectively arranged on both outer sides of the opposing parabolic mirrors so that the optical axes are aligned, and the focal positions of the optical lenses are respectively set to the parabolic mirrors. The center position of the light incident hole and the center position of the light exit hole.
Here, the optical lens is any one of a spherical convex lens, an aspheric convex lens, a combination lens combining a spherical convex lens, a combination lens combining an aspheric convex lens, a spherical convex lens, a spherical concave lens, an aspheric convex lens, and an aspheric concave lens. Or a combination lens combining one or more. In addition, the spherical convex lens and the aspherical convex lens include a plano-convex lens in which one side is a flat surface.

In the light control panel according to the second aspect of the invention, the light control element according to the first aspect is arranged on a plane with the optical axis of the light control element facing a predetermined direction.
Here, it is preferable that the optical axis of the light control element is orthogonal to the light control panel.

In the light control device according to the third aspect of the invention that meets the above object, the light control panel according to the second aspect of the invention is arranged with a gap.

In the light control element according to claim 1, the center of the light incident hole (focal point of the other parabolic mirror) is selected from the light incident from the light incident hole at the bottom center of the one parabolic mirror. Only the light beam passing through is reflected by the other parabolic mirror and becomes a light beam parallel to the optical axis (straight line passing through the light incident hole center and the light emission hole center) and enters one parabolic mirror. The light beam incident on one parabolic mirror is reflected toward the center of the light exit hole at the focal position of the one parabolic mirror. As a result, all the light beams incident on the light entrance hole of this light control element are emitted from the center of the light exit hole, and apparently all the light irradiated to the light control element is reflected by the light exit hole. Thus, no deviation occurs in the reflection position.

In particular, in the light control element according to claim 2, an optical lens having the center position of the light entrance hole as a focal point is disposed in front of the light entrance hole of the light control element, and the center position of the light exit hole is defined as a focus behind the light exit hole. By arranging each of the optical lenses, a wide range of light flux parallel to the optical axis of the optical lens within the aperture of the optical lens is converged to the center position of the light entrance hole of the light control element, and enters the light control element. Since the light beam is reflected between the parabolic mirrors and converged to the center position of the light exit hole of the light control element, it can be emitted as a uniformly expanded light beam from the light exit hole.

In the light control panel according to claim 3, since all the light irradiated to the light entrance hole of the light control element is reflected by the light exit hole, there is no deviation in the reflection position. An optical image without distortion can be formed. By combining the light control element and the optical lens, a wide range of light flux can enter the light control element from the light incident hole, converge on the light output hole, and then be expanded and emitted. A bright optical image can be formed.
Particularly, in the light control panel according to claim 4, since the optical axis of the light control element is orthogonal to the light control panel, an optical image of the object can be formed at another position by the light control panel. .

In the light control device according to claim 5, when scattered light from an object is incident on the light control device, the optical control panel disposed on the object side receives the scattered light and reproduces the optical image. In order to form an image, a reconstructed image in which the unevenness is reversed is obtained. Then, when the reproduced image formed by the light control panel arranged on the object side with the unevenness reversed is further received and reproduced by the light control panel, the unevenness of the reproduced image with the unevenness reversed is reversed again. A reproduced image having is obtained.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a side view of the light control panel according to the first embodiment of the present invention, FIG. 2 (A) is a front view of the light control panel, and (B) and (C) are modifications. FIG. 3 is a partially enlarged side view of the light control panel according to the second embodiment of the present invention, and FIG. 4 is the light used in the light control panel. FIG. 5 is an explanatory view of a convex lens according to a modification, FIG. 6 is an explanatory view of a light control panel according to another modification, and FIG. 7 is a light control according to the third embodiment of the present invention. FIG. 8 is an explanatory diagram of the light control device according to a modification.

As shown in FIGS. 1 and 2A, in the light control panel 10 according to the first embodiment of the present invention, the light control element 11 has the light incident hole 12 on the front side and the light output hole 13 on the back side. Are arranged side by side on a plane at regular intervals s, and the optical axis L of the light control element 11 passing through the centers of the light incident hole 12 and the light exit hole 13 is orthogonal to the light control panel 10. . Details will be described below.

Here, the light control element 11 is configured by arranging the parabolic mirrors 14 and 15 so as to face each other with the optical axis L aligned, and the focal points of the parabolic mirrors 14 and 15 are parabolic surfaces on the opposite side. At the bottom center of the mirrors 15 and 14 (ie, the distance between the bottom centers of the parabolic mirrors 15 and 14 matches the focal length) and at the center of the bottom of one parabolic mirror 14 Is provided with a light entrance hole 12 and a light exit hole 13 at the center of the bottom of the other parabolic mirror 15. The outer diameter D of the light control element 11 is, for example, 1 to 20 mm, and the lower limit value of the diameter d of the light incident hole 12 and the diameter d ′ of the light emission hole 13 is 1 / out of the outer diameter D of the light control element 11. 50. Further, the upper limit value of the diameter d of the light entrance hole 12 and the diameter d ′ of the light exit hole 13 is 1/5 of the outer diameter D.

Here, by setting the diameter d of the light entrance hole 12 and the diameter d ′ of the light exit hole 13 to be 1/50 or more, preferably 1/20 or more of the outer diameter D of the light control element 11, the center of the light entrance hole 12 is obtained. Light beams having various incident angles passing through (the focal point of the parabolic mirror 15) are introduced into the light control element 11, and various incident angles passing through the center of the light exit hole 13 (the focal point of the parabolic mirror 14). Can be emitted from the light control element 11. On the other hand, the diameter d of the light entrance hole 12 and the diameter d ′ of the light exit hole 13 are 1/5 or less, preferably 1/6 or less, more preferably 1/7 or less, and further preferably, the outer diameter D of the light control element 11. By setting it to 1/10 or less, it is possible to prevent an excessive light beam out of focus (out of the center of the light incident hole 12) from entering the light control element 11 and from the light exit hole 13 of the light control element 11. It is possible to prevent an excessive light beam out of focus (out of the center of the light exit hole 13) from being emitted. As a result, a bright optical image with no blur can be displayed on the light control panel 10.

For example, as shown in FIG. 2A, the light control element 11 has the center of the light incident hole 12 (light exit hole 13) as 1 on the plane. It can arrange so that the length of a side may be arrange | positioned at each vertex position of the equilateral triangle equal to the outer diameter D of the light control element 11 (regular triangle vertex arrangement | positioning). Further, the centers of the light incident holes 12 (light emitting holes 13) can be arranged on a plane so as to be disposed at respective vertex positions of a square in which the length of one side is equal to the outer diameter D (square vertex arrangement). Note that when the equilateral triangle vertex arrangement is compared with the square vertex arrangement, the equilateral triangle vertex arrangement has a higher filling rate on the plane. Therefore, if the equilateral triangle vertex arrangement is adopted, the light control panel 10 displays a precise image. Can be displayed.
As shown in FIG. 2B, the light control element 11a is formed in a regular hexagonal shape with an outer dimension E when viewed from the front, and the light control element 11a is formed in its light entrance hole 12b as shown in FIG. The centers of the (light exit holes 13b) are arranged so as to be arranged at the apex positions of equilateral triangles having a side length F equal to (1/2) · 3 ^1/2 · E (a honeycomb structure). You can also.

As shown in FIG. 1, the light control panel 10 is orthogonal to the optical axis at a position half the focal length on the optical axis from the center of the light incident hole 12 provided at the center of the bottom that intersects the optical axis. The circular paraboloidal mirrors 14 are arranged in a plan view when the opening 14a exists on the plane (for example, the openings 14a of the adjacent parabolic mirrors 14 are in close contact with each other by aligning the direction of the optical axis). The first element forming member 16 formed side by side and the center of the light exit hole 13 provided at the center of the bottom that intersects the optical axis are orthogonal to the optical axis L at a position that is ½ of the focal length on the optical axis. A circular paraboloidal mirror 15 is arranged in a plan view when the opening 15a exists on a plane (for example, the openings 15a of adjacent parabolic mirrors 15 are in close contact with each other with the direction of the optical axis aligned. The second element forming member 17 formed side by side, and the light incident hole 12 and the light emitting hole 13 respectively. To face so that the optical axes of the respective parabolic mirrors 14, 15 toward the outside coincide with each other are formed closely arranged.

Here, the length c in the optical axis direction of the optical paths 12a and 13a communicating with the light entrance hole 12 and the light exit hole 13 is, for example, 0 to p / p when the focal length of the parabolic mirrors 14 and 15 is p. A range of 10 is set. The first and second element forming members 16 and 17 are element members in which a paraboloid that is a base of the parabolic mirrors 14 and 15 is formed by press molding or injection molding of translucent plastic. Then, the parabolic surface of the element member is subjected to mirror surface treatment (plating treatment or metal vapor deposition treatment) except for the portions corresponding to the light entrance hole 12 and the light exit hole 13 formed at the center of the bottom, and the light entrance hole 12 and formed by subjecting the surface of the element member in which the light exit holes 13 are lined up to an opaque process (adhering an opaque sheet).

Next, the operation of the light control panel 10 according to the first embodiment of the present invention will be described.
As shown in FIG. 1, a part of the scattered light from the object 18 is irradiated to the light control panel 10 and travels into the light control element 11 from the light incident hole 12 of each light control element 11. Here, since the center of the light incident hole 12 is at the focal point of the parabolic mirror 15 and the center of the light emitting hole 13 is at the focal point of the parabolic mirror 14, it passes through the light incident hole 12 and is inside the light control element 11. The scattered light beam that has traveled in the direction is reflected by the parabolic mirror 15, becomes a light beam parallel to the optical axis L, enters the parabolic mirror 14, and is reflected toward the light exit hole 13 by the parabolic mirror 14. The As a result, the light beam incident on the light control element 11 from the light entrance hole 12 is emitted from the light exit hole 13 of the light control element 11 and apparently reflected by the light exit hole 13. There is no deviation in the reflection position.

On the other hand, of the light that enters the light control element 11 from the light incident hole 12, the light beam that does not pass through the center of the light incident hole 12 is also reflected by the parabolic mirror 15 and enters the parabolic mirror 14. Here, in reality, the focal points of the parabolic mirrors 14 and 15 are not point-like but have a finite area. Therefore, when the light enters the light control element 11, the center of the light incident hole 12 (of the parabolic mirror 15). The light that has not passed through the focal point passes through a position deviated from the center of the light exit hole 13 of the light control element 11 (a position deviated from the focal point of the parabolic mirror 14). Further, since the diameter d of the light entrance hole 12 and the diameter d ′ of the light exit hole 13 are set within a predetermined range with respect to the outer diameter D of the light control element 11, excessive defocusing is caused in the light control element 11. It is possible to prevent a light beam having a light amount from entering, and to prevent a light beam having an excessive light amount out of focus from being emitted from the light control element 11, so that an optical image formed by the light control panel 10 is blurred (the optical image is blurred). It is possible to prevent the surrounding area from blurring white). As a result, as shown in FIG. 1, the scattered light scattered at the point A of the object 18 is converged to the point A ′ by the light control panel 10, and the scattered light scattered at the point B is moved to the point B ′ by the light control panel 10. It can be converged, and is observed as a clear, distorted, non-bleeded real image 19 (where the irregularities are reversed).

As shown in FIGS. 3 and 4, the light control panel 20 according to the second embodiment of the present invention has the light control element 21 facing the light incident hole 22 on the front side and the light output hole 23 on the back side. The optical axes M of the light control elements 21 passing through the centers of the light incident holes 22 and the light output holes 23 are orthogonal to the light control panel 20. Here, the light control element 21 arranges spherical convex lenses (hereinafter referred to as convex lenses) 26 and 27, which are examples of optical lenses, by aligning the optical axes M on both outer sides of the opposing parabolic mirrors 24 and 25, respectively. Moreover, the focal positions of the convex lenses 26 and 27 are the center position of the light incident hole 22 and the center position of the light exit hole 23 of the parabolic mirrors 24 and 25, respectively.

The outer diameter F of the light control element 21 is, for example, 1 to 20 mm, and the lower limit values of the diameter f of the light incident hole 22 and the diameter f ′ of the light emission hole 23 are 1/50 of the outer diameter F of the light control element 21; Preferably it is 1/20. The upper limit of the diameter f of the light entrance hole 22 and the diameter f ′ of the light exit hole 23 is 1/5 or less, preferably 1/6 or less, more preferably 1/7 or less, and further preferably 1 of the outer diameter F. / 10 or less. Thereby, a bright optical image with no blur can be displayed on the light control panel 20. Further, the light control elements 21 need to be arranged uniformly on the plane without any gap. For example, the center of the light incident hole 22 (light exit hole 23) of the light control element 21 is one side long. An equilateral triangle apex arranged on a plane so as to be arranged at each apex position of an equilateral triangle equal to the outer diameter F of the light source, or the center of the light incident hole 22 (light exit hole 23) has a length of one side of the outer diameter F. Adopt a square vertex arrangement that arranges on a plane so that it is arranged at each vertex position of a square equal to. In addition, when the equilateral triangle vertex arrangement is compared with the square vertex arrangement, the equilateral triangle vertex arrangement has a higher filling rate on the plane, so if the equilateral triangle vertex arrangement is adopted, a precise image is displayed on the light control panel. can do.

As shown in FIG. 3, the light control panel 20 has an optical axis at a position half the focal length on the optical axis from the center of the light incident hole 22 provided at the center of the bottom that intersects the optical axis on one side. The circular paraboloid mirrors 24 are arranged in a plane when viewed from the front where the opening 24a exists on a plane orthogonal to the plane (for example, the openings 24a of the adjacent parabolic mirrors 24 are in close contact with each other with the direction of the optical axis aligned. A first element forming member 29 formed with a truncated cone-shaped space portion 28 having a diameter-expanded side opened on one side and a diameter-reduced side connected to the light incident hole 22, and light on the other side. The opening 25a exists on a plane perpendicular to the optical axis at a position half the focal length on the optical axis from the center of the light exit hole 23 provided at the center of the bottom that intersects the axis. The parabolic mirrors 25 are arranged side by side (for example, the openings 25a of the adjacent parabolic mirrors 25 are aligned with the direction of the optical axis aligned. A second element forming member 31 formed with a frustoconical space 30 formed on the other side and having a diameter-expanded side opened on the other side and connected to the light-emitting hole 23 on the other side. The parabolic mirrors 24 and 25 face each other so that the optical axes of the paraboloid mirrors 24 and 25 coincide with each other, and are joined to one side of the first element forming member 29. A first lens plate 32 on which a convex lens 26 is arranged in accordance with the center position is a second lens in which a convex lens 27 is arranged on the other side of the second element forming member 31 in accordance with the opening center position of the space 30. The lens plates 33 are attached to each other.

The length of the space 28 in the optical axis direction is the same as the focal length of the convex lens 26, and the length of the space 30 in the optical axis direction is the same as the focal length of the convex lens 27. Further, the diameters of the space portions 28 and 30 on the enlarged diameter side and the outer diameters of the convex lenses 26 and 27 coincide with the outer diameter F of the light control element 21.
Here, the first (second) element forming member 29 (31) is first formed by translucent plastic press-molding the element member on which the parabolic surface on which the parabolic mirror 24 (25) is formed. Alternatively, it is formed by injection molding, and then a mirror surface treatment (plating treatment or metal vapor deposition treatment) is performed on the parabolic surface of the element member except for the portion corresponding to the light entrance hole 22 (light exit hole 23) formed at the center of the bottom. Is formed. Further, the first lens plate 32 (second lens plate 33) is formed by press molding or injection molding of translucent plastic.
As shown in FIG. 5, the convex lenses 36 and 37 provided on the first and second lens plates 34 and 35 may be plano-convex lenses, and the side attached to the space portions 28 and 30 may be convex. Moreover, it is good also considering the side attached to the space parts 28 and 30 as a plane.

Next, the operation of the light control panel 20 according to the second embodiment of the present invention will be described.
In the light control element 21, a light beam having an incident angle parallel to the optical axis M of the convex lens 26 in the scattered light from the object passes through the convex lens 26 and reaches the center position of the light incident hole 22 (focal point of the convex lens 26). Since the light converges, the light beam that has passed through the light entrance hole 22, traveled through the light control element 21, and was reflected by the parabolic mirror 25 is parallel to the optical axis M and enters the parabolic mirror 24. Further, since the light beam incident on the parabolic mirror 24 is reflected toward the light exit hole 23, it converges at the center position of the light exit hole 23 (the focal point of the convex lens 27). Then, the light beam converged at the center position of the light exit hole 23 is returned to the light beam parallel to the optical axis M by the convex lens 27 and emitted. As a result, in the light control element 21, compared to the light control element 11, a larger amount of light flux can be collected by the convex lens 26, incident on the light control element 21 from the light entrance hole 22, and emitted from the light exit hole 23.

On the other hand, a light beam having an incident angle that is not parallel to the optical axis M of the convex lens 26 in the scattered light from the object is bent by the convex lens 26 and is different from the center of the light incident hole 22 (the focal point of the parabolic mirror 25). The light passes through the position, enters the light control element 21, is reflected by the parabolic mirror 25, and enters the parabolic mirror 24. The light incident on the parabolic mirror 24 is emitted from the light control element 21 through a position different from the center of the light exit hole 23 (the focal point of the parabolic mirror 24). Further, since the diameter f of the light entrance hole 22 and the diameter f ′ of the light exit hole 23 are set within a predetermined range with respect to the outer diameter F of the light control element 21, excessive defocusing is caused in the light control element 21. It is possible to prevent a light beam having a light amount from entering and to prevent a light beam having an excessive light amount out of focus from being emitted from the light control element 21 and to prevent an optical image formed by the light control panel 20 from bleeding. . As a result, a clear optical image free from distortion blur can be formed from the scattered light scattered by the object.

Here, as shown in FIG. 6, the diameter of the convex lens 38 arranged outside the parabolic mirror 24 is smaller than the diameter of the parabolic mirror 24 or the pitch of the light incident holes 22 (for example, the parabolic mirror 24 The diameter or the diameter of the convex lens 39 arranged outside the parabolic mirror 25 is smaller than the diameter of the parabolic mirror 25 or the pitch of the light emitting holes 23 (for example, 1/5 to 3/4 of the diameter or the pitch of the light incident holes 22). Alternatively, the light control panel 41 including the light control element 40 having a diameter of the parabolic mirror 25 or 1/5 to ¾ of the pitch of the light exit holes 23 may be formed.
By reducing the diameter of the convex lens 38, the scattered light from an object close to the convex lens 38 can reach the light incident hole 22 directly without passing through the convex lens 38 and can enter the light control element 40. By reducing the diameter of 39, the light can be directly emitted from the light exit hole 23 of the light control element 40 without passing through the convex lens 39. On the other hand, scattered light from an object far from the convex lens 38 passes through the convex lens 38 and reaches the light incident hole 22 and enters the light control element 40, and light emitted from the light output hole 23 of the light control element 40 is convex lens. 39 is discharged. As a result, the light control panel 41 can form a three-dimensional image even on a distant object or a close object, thereby forming a far and near light control panel. The focal lengths of the convex lenses 38 and 39 are preferably the same, and the optical axis of the convex lens 38 and the optical axis of the convex lens 39 are preferably coincident.

As shown in FIG. 7, in the light control device 42 according to the third embodiment of the present invention, the light control panels 43 and 44 described in the first or second embodiment are parallel to each other with a gap. The optical axes of the light control elements (not shown) arranged on the respective light control panels 43 and 44 coincide with each other. Here, the light control panel 43 is disposed on the object 45 side, and the light control panel 44 is on the back side of the light control panel 43 and outside the position where the reproduced image 46 of the object 45 formed by the light control panel 43 is formed. Has been placed. A reproduced image 46 reproduced by receiving and reproducing the scattered light from the object 45 on the object side is an optical image in which the unevenness is reversed in order to form the reflected light. When the reproduced image 46 is further received by the light control panel 44 and reproduced, the unevenness of the reproduced image 46 is reversed again, so that a reproduced image 47 having normal unevenness is obtained. Note that the optical axes of the light control elements (not shown) arranged in the light control panels 43 and 44 do not have to coincide with each other.
Further, as shown in FIG. 8, the light control device 48 may be configured by arranging two light control panels 43, 44 arranged to face the object 45 at an angle rather than parallel to each other.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the first embodiment, a transparent material (for example, acrylic resin) having a low refractive index and a low light absorption rate is filled into the space surrounded by the entrance / exit holes or the entrance / exit holes and the parabolic mirror. May be. As a result, foreign matter can be prevented from entering the light entrance / exit hole and the space.
Further, in the first embodiment, instead of the first and second element forming members, a transparent material is used so that the outer shape is the same as the outer shape of the parabolic mirror arranged opposite to each other with the optical axis aligned. One large paraboloid in which spindle-shaped solids that are formed and are mirror-finished except for the areas corresponding to the light entrance and exit holes at the bottom center of each paraboloid are arranged with the optical axes aligned. Forming a mirror member, and a single large hole forming member provided with a hole arranged side by side with the same outer shape as the large paraboloid mirror member and having the same center position as the bottom center of each paraboloid It is also possible to form the light control panel by bringing the large parabolic mirror members into close contact so that the light emitting holes and the holes of the hole forming member communicate with each other.
Furthermore, in the second embodiment, a spherical convex lens is used as an optical lens. However, an aspheric convex lens, a combination lens combining a spherical convex lens, a combination lens combining an aspheric convex lens, a spherical concave lens, a non-spherical concave lens, A combination lens obtained by combining any one or more of a spherical convex lens and an aspheric concave lens can also be used.

It is a side view of the light control panel which concerns on the 1st Embodiment of this invention. (A) is a front view of the light control panel, (B) and (C) are a front view of a light control element according to a modification, and an enlarged front view of the light control panel, respectively. It is a partial expanded side view of the light control panel which concerns on the 2nd Embodiment of this invention. It is a side view of the light control element used with the same light control panel. It is explanatory drawing of the convex lens which concerns on a modification. It is explanatory drawing of the light control panel which concerns on another modification. It is explanatory drawing of the light control apparatus which concerns on the 3rd Embodiment of this invention. It is explanatory drawing of the light control apparatus which concerns on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Light control panel 11, 11a: Light control element, 12: Light entrance hole, 12a: Light path, 12b: Light entrance hole, 13: Light exit hole, 13a: Light path, 13b: Light exit hole, 14: Parabolic mirror 14a: opening, 15: parabolic mirror, 15a: opening, 16: first element forming member, 17: second element forming member, 18: object, 19: real image, 20: light control panel, 21: Light control element, 22: Light entrance hole, 23: Light exit hole, 24: Parabolic mirror, 24a: Opening part, 25: Parabolic mirror, 25a: Opening part, 26, 27: Spherical convex lens, 28: Space part, 29: First element forming member, 30: Space part, 31: Second element forming member, 32: First lens plate, 33: Second lens plate, 34: First lens plate, 35: second lens plate, 36, 37: convex lens, 38, 39: convex lens, 40: light control element, 41: Control panel, 42: light control device, 43 and 44: light control panel, 45: object, 47: reproduced image 48: Light control device

Claims (5)

A light control element in which a parabolic mirror is arranged opposite to the optical axis,
The focal point of each of the parabolic mirrors is at the bottom center of the parabolic mirror on the opposite side, and a light incident hole is formed at the center of the bottom of one of the parabolic mirrors, and the other parabolic surface. A light control element characterized in that a light exit hole is provided in the center of the bottom of the mirror. 2. The light control element according to claim 1, wherein optical lenses are respectively arranged on both outer sides of the opposing parabolic mirrors so that optical axes are aligned, and the focal positions of the optical lenses are respectively set to the parabolic mirrors. A light control element characterized by having a center position of the light entrance hole and a center position of the light exit hole. The light control panel according to claim 1, wherein the light control element according to claim 1 is arranged on a plane with the optical axis of the light control element facing a predetermined direction. 4. The light control panel according to claim 3, wherein the optical axis of the light control element is orthogonal to the light control panel. The light control device according to claim 3, wherein two light control panels are arranged with a gap.

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