WO2017057000A1

WO2017057000A1 - Blind spot visibilization aid device

Info

Publication number: WO2017057000A1
Application number: PCT/JP2016/077164
Authority: WO
Inventors: 健川合; 小幡　雅人
Original assignee: 日本精機株式会社
Priority date: 2015-09-29
Filing date: 2016-09-14
Publication date: 2017-04-06
Also published as: JP6753408B2; JPWO2017057000A1

Abstract

Provided is a blind spot visibilization aid device capable of improving visibility without distorting a view image or causing an abnormal sound. The blind spot visibilization aid device 100 for projecting an image of a blind spot blocked by an obstacle is equipped with: one pair of parallel planar mirrors 110 for which a semi-transmissive planar mirror 111, which is disposed on a viewer's side and which, upon receiving light ML of the image, reflects part of the light ML while allowing part of the light to transmit therethrough, and a mirror 112, which reflects the light ML to the semi-transmissive planar mirror 111, are arranged so as to face each other; multiple louvers 122a1-112a5 which are disposed on the viewer-side of the semi-transmissive planar mirror 111 so as to block light SL incident on the semi-transmissive planar mirror 111 at a predetermined angle from the viewer's side; and a gap part A which is disposed between the semi-transmissive planar mirror 111 and the multiple louvers 122a1-112a5.

Description

Blind spot assist device

The present invention relates to a blind spot assisting device that projects an image of a blind spot area obstructed by an obstacle such as a front pillar in a vehicle.

2. Description of the Related Art Conventionally, for example, a device disclosed in Patent Document 1 is known as a blind spot assisting device that projects a blind spot caused by an obstacle such as a front pillar in a vehicle. The blind spot assisting device includes a semi-transmission mirror that receives light representing an image of the blind spot region, reflects a part of the light and transmits a part of the light, and a mirror that reflects the light to the semi-transmission mirror. A pair of mirrors arranged so as to face each other, and a plurality of light shielding portions provided on the viewer side of the semi-transmissive mirror and blocking light incident at a predetermined angle from the viewer side. is there.

JP 2015-120477 A

However, since the blind spot assisting device according to Patent Document 1 is arranged so that the light shielding portion is in contact with the semi-transmissive mirror, the semi-transmissive mirror is distorted by the light shielding portion, and the visually recognized image is distorted or abnormal noise is generated. There was a problem that it might occur.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a blind spot assisting device capable of improving visibility without causing distortion or abnormal noise of a visually recognized image. To do.

In order to achieve the above object, a blind spot assisting device according to the present invention is a blind spot assisting device that displays an image of a blind spot area blocked by an obstacle,
Arranged so that a semi-transmission mirror that receives light representing the image, is provided on the viewer side, reflects a part of the light, and transmits a part of the light, and a mirror that reflects the light to the semi-transmission mirror face each other. A pair of mirrors,
A plurality of light shielding portions that are provided on the viewer side of the semi-transmissive mirror and block light incident on the semi-transmissive mirror at a predetermined angle from the viewer side;
And a gap provided between the semi-transmissive mirror and the plurality of light-shielding portions.

According to the present invention, it is possible to improve visibility without causing distortion or abnormal noise of a visually recognized image.

It is a figure which shows the general view of the driver's seat vicinity of the vehicle by which the blind spot auxiliary device which concerns on embodiment of this invention is arrange | positioned. It is a top view which shows the general view of a blind spot auxiliary device same as the above. It is a perspective view which shows a pair of parallel plane mirror of a blind spot auxiliary | assistance apparatus same as the above. It is (a) perspective view and (b) sectional drawing which show a blind spot auxiliary | assistance apparatus same as the above. It is a figure which shows a blind spot auxiliary | assistance apparatus same as the above. It is a figure which shows a blind spot auxiliary | assistance apparatus same as the above. It is a principal part enlarged view which shows a blind spot auxiliary | assistance apparatus same as the above. It is a principal part enlarged view which shows a blind spot auxiliary | assistance apparatus same as the above. It is a principal part enlarged view which shows the blind spot auxiliary | assistance apparatus which concerns on a comparative example.

A blind spot assisting device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an overview of the vicinity of a driver's seat of a vehicle 1 in which a blind spot assisting device 100 according to the present embodiment is arranged. As shown in FIG. 1, the vehicle 1 includes a steering 10, a windshield glass 20,

side glasses

30 and 40, and

front pillars

50 and 60.

Reference numerals

21 and 22 denote light-shielding black ceramic (black ceramic) portions that are printed on the periphery of the windshield glass 20.

In the vehicle 1, a viewer (mainly a driver) directly sees the scenery in the area where the windshield glass 20 (excluding the black ceramic portion 21) and the

side glasses

30 and 40 are arranged, while the front pillar 50, In the area where 60 and the

black sera parts

21 and 22 are arranged, the

front pillars

50 and 60 and the

black sera parts

21 and 22 block the visual field of the viewer, resulting in a blind spot area where the landscape cannot be seen directly. That is, the

front pillars

50 and 60 and the black

ceramic portions

21 and 22 correspond to obstacles in the present invention.

Next, a basic configuration of the blind spot assisting device 100 according to the present embodiment will be described based on FIGS. 1 to 3. 2 is a plan view showing an overview of the blind spot assisting device 100. FIG. In FIG. 2, only a plurality of louvers are illustrated in a case body 120 described later. FIG. 3 is a perspective view showing a pair of parallel flat mirrors 110.
As shown in FIGS. 1 and 2, the blind spot assisting device 100 is disposed on the front pillar 50 on the right side (driver side) when viewed from the viewer side, and is a blind spot area blocked by the front pillar 50 and the black ceramic portion 21. It is a reflection of an image. The blind spot assisting device 100 is disposed so as to face the front pillar 50 and the black ceramic portion 21 when viewed from the viewer.

The blind spot assisting device 100 includes a pair of parallel plane mirrors (a pair of mirrors) 110 as shown in FIGS.

The pair of parallel plane mirrors 110 are arranged such that a semi-transmission plane mirror (semi-transmission mirror) 111 that reflects a part of incident light and transmits a part thereof, and a plane mirror (mirror) 112 face each other in parallel. It is constituted by being done. The transflective flat mirror 111 and the flat mirror 112 are fixed in a parallel positional relationship by being arranged on a holder member (not shown). It should be noted that the pair of mirrors of the present invention need not be arranged completely in parallel as long as they are arranged so as to face each other, and may be curved mirrors instead of plane mirrors.

The transflective flat mirror 111 is disposed on the viewer side, and by depositing a metal such as aluminum on the surface of a base material made of a translucent resin material such as polyethylene terephthalate, polycarbonate, polyethylene, acrylic, etc. A reflectance adjustment layer is formed so as to have reflectance. The reflectance (transmittance) is adjusted depending on the thickness and type of the reflectance adjusting layer. The light quantity ratio between the transmitted light and the reflected light in the transflective flat mirror 111 of this embodiment is transmitted light: reflected light = 1: 4 (reflectance 80%). The transflective flat mirror 111 may be formed by coating the surface of a base material with a dielectric multilayer film. The transflective flat mirror 111 is arranged such that the incident side end (incident side side) E10 protrudes from the incident side end (incident side side) E11 of the flat mirror 112, and the transflective flat mirror 111 is disposed. And the plane mirror 112 are arranged in a stepwise manner in the horizontal direction.

The plane mirror 112 is arranged so that the plane (reflection surface) thereof is parallel to the plane (semi-transmission reflection surface) of the semi-transmission plane mirror 111. For example, the substrate made of the above-described translucent resin material is used. It is a flat aluminum vapor deposition mirror formed by vapor-depositing a metal such as aluminum on the surface.

The semi-transmissive flat mirror 111 and the flat mirror 112 have their respective planes (semi-transmissive reflective surface and reflective surface) perpendicular to the traveling direction of light ML (indicated by arrows in FIG. 3) in the pair of parallel flat mirrors 110. It is formed in a substantially wedge shape so that the width in the direction gradually decreases in the traveling direction of the light ML in the pair of parallel flat mirrors 110. This is to reduce the size and weight by removing unnecessary portions that are out of the visual field range of the viewer. Further, the transflective flat mirror 111 and the flat mirror 112 are similar in planar shape to each other (including a case where they are substantially similar). Further, the incident side end E10 of the semi-transmissive flat mirror 111 and the incident side end E11 of the flat mirror 112 are inclined along the glass surface of the windshield glass 20. This is because it can be placed close to the glass surface of the windshield glass 20.

Next, the operation of the pair of parallel flat mirrors 110 will be described with reference to FIG. FIG. 2 shows a state in which the viewer is seated in the driver's seat, and the viewpoint O indicates the viewer's viewpoint (eye point).

In FIG. 2, a blind spot area D that is blocked by a front pillar 50 (not shown, but also including the black ceramic portion 21) is generated in the front view of the viewer (viewpoint O). Therefore, the object M present in the blind spot area D cannot be directly viewed from the viewpoint O.
On the other hand, the light ML from the object M is incident on the pair of parallel plane mirrors 110 and is repeatedly reflected between the pair of parallel plane mirrors 110, and a part of the light ML is emitted from the pair of parallel plane mirrors 110 ( The light is transmitted through the semi-transmissive flat mirror 111 or directly emitted from the gap between the semi-transmissive flat mirror 111 and the flat mirror 112). The light incident on the pair of parallel plane mirrors 110 and repeatedly reflected between the pair of parallel plane mirrors 110 is light having an inclination with respect to the parallel plane of the pair of parallel plane mirrors 110. Part of the light ML emitted from the pair of parallel flat mirrors 110 reaches the viewpoint O. Therefore, the image of the object M reflected on the plane mirror 112 continuously with the scenery that can be directly viewed from the viewpoint O can be viewed through the transflective plane mirror 111, and the image appears as if it is transmitted through the front pillar 50. In addition, in a small area on the back side of the front pillar 50 (the part indicated by hatching) in the blind spot area D, light from this area cannot enter the pair of parallel plane mirrors 110, and the image is displayed as a pair of parallel plane mirrors. 110, the image of the blind spot area D can be projected by the pair of parallel plane mirrors 110 in almost all other areas.
In projecting the image of the blind spot area D by the pair of parallel plane mirrors 110, the viewer places the blind spot assisting device 100 at an arbitrary height of the front pillar 50 (a height suitable for the viewpoint O) and a pair of parallel planes. The mirror 110 is arranged so that the image of the blind spot area D is reflected, that is, the angle of the pair of parallel plane mirrors 110 is adjusted so that the light ML from the blind spot area D reaches the viewpoint O. Since the positional relationship between the transflective flat mirror 111 and the flat mirror 112 is fixed in parallel with each other, the pair of parallel flat mirrors 110 can be arranged at the same time by a single arranging operation, and the pair of parallel mirrors 110 can be arranged by a single adjusting operation. The angles of the parallel plane mirrors 110 can be adjusted simultaneously.

By the way, since the light ML is repeatedly reflected between the pair of parallel plane mirrors 110, when the light ML is incident n times on the transflective plane mirror 111, n light ML indicating an image of the object M is one parallel plane. The light is emitted from the mirror 110. That is, light ML indicating images of n objects M is emitted from the pair of parallel flat mirrors 110 along the left-right direction of the viewpoint O. Therefore, the viewer can view the image of the object M in a wide range in the left-right direction. Note that the light ML emitted from the pair of parallel flat mirrors 110 decreases in luminance as the number of reflections by the semi-transmissive flat mirror 111 increases.

Next, the exterior structure of the blind spot assisting device 100 will be described with reference to FIG.

As shown in FIG. 4, the blind spot assisting device 100 includes a pair of parallel flat mirrors 110 and a case body 120. 4 (a) is a perspective view showing the blind spot assisting device 100, and FIG. 4 (b) is a cross-sectional view taken along the line XX of FIG. 4 (a). In FIG. 4, the front side as viewed from the viewer is described as “front”, and the depth side is described as “rear”.

The case body 120 houses a pair of parallel flat mirrors 110 and includes a rear case 121 and a front case 122.

The rear case 121 is made of a light-shielding resin material such as polyurethane resin, and is seen from the side of the light emission side formed integrally with the rear wall portion 121a, the inner top wall portion 121b, and the inner bottom wall portion 121c. It is a substantially U-shaped (inverted C-shaped) member. A flat mirror 112 is disposed on the rear wall 121a so as to be positioned between the inner top wall 121b and the inner bottom wall 121c. The inner top wall 121b and the inner bottom wall 121c are placed on the open ends 121d and 121e so that the semi-transmissive flat mirror 111 is parallel to the flat mirror 112.

Like the rear case 121, the front case 122 is made of a light-shielding resin material such as polyurethane resin, and is formed by integrally forming a plurality of louvers 122a1 to 122a5, the outer top wall portion 122b, and the outer bottom wall portion 122c. It is a frame-shaped member. The plurality of louvers 122a1 to 122a5 are non-translucent plate-like portions provided at a predetermined interval between the outer top wall portion 122b and the outer bottom wall portion 122c, and are located on the viewer side of the semi-transmissive flat mirror 111. Then, it functions as a light-shielding unit that blocks external light incident on the pair of parallel flat mirrors 110 at a predetermined angle from the viewer side (mainly at an incident angle that is reflected by the semi-transmissive flat mirror 111 or the flat mirror 112 and reaches the viewpoint O). . The plurality of louvers 122a1 to 122a5 are disposed at a predetermined angle with respect to the viewer-side plane of the semi-transmissive flat mirror 111 so that the tip portions thereof face the viewer. The operation of the plurality of louvers 122a1 to 122a5 will be described in detail later. The outer top wall part 122b and the outer bottom wall part 122c are provided so as to cover the outer sides of the inner top wall part 121b and the inner bottom wall part 121c, respectively. Further, the outer top wall portion 122b and the outer bottom wall portion 122c serve as light shielding walls that block outside light incident on the pair of parallel flat mirrors 110 from the upper side or the lower side. The outer top wall portion 122b and the outer bottom wall portion 122c are provided with stepped

portions

122d and 122e so as to face the

open end portions

121d and 121e of the inner top wall portion 121b and the inner bottom wall portion 121c. The stepped

portions

122d and 122e are formed at positions where they contact the peripheral edge of the semi-transmissive flat mirror 111 when the front case 122 is assembled to the rear case 121.

As shown in FIG. 4, the case body 120 is provided on the side surface on the incident side, and is reflected by the flat mirror 112 provided on the side surface on the emission side, and the first opening portion 120 a that receives the light ML from the blind spot region D. It has the 2nd opening part 120b which radiate | emits light ML, and the 3rd opening part 120c which is provided in the front surface and exposes the semi-transmissive flat mirror 111. The third opening 120c is divided into a plurality of regions by louvers 122a1 to 122a5.

Next, the operation of the louvers 122a1 to 122a5 will be described with reference to FIG. 5 is a view of the blind spot assisting device 100 as viewed from the upper front side. In FIG. 5, the case body 120 is illustrated with portions other than the louvers 122a1 to 122a5 omitted for easy viewing. .

In addition to the light ML from the blind spot area D, external light also enters the pair of parallel flat mirrors 110 from the viewer (viewpoint O) side. Of the external light incident on the pair of parallel flat mirrors 110 from the viewer side, in particular, the light incident on the transflective flat mirror 111 while being inclined toward the incident side of the light ML with respect to the normal PL of the plane of the transflective flat mirror 111 ( A part of the stray light SL is hereinafter reflected by the semi-transmissive flat mirror 111 toward the viewpoint O, or a part of the light is transmitted through the semi-transmissive flat mirror 111 and reflected by the flat mirror 112 to be semi-transmissive again. This is a factor that decreases the visibility of the image of the object M emitted from the flat mirror 111 toward the viewpoint O and reflected on the flat mirror 112. In contrast, the blind spot assisting device 100 can provide high visibility by blocking the stray light SL incident on the semi-transmissive flat mirror 111 by providing the louvers 122a1 to 122a5 on the viewer side of the semi-transmissive flat mirror 111. it can. The length and number of the louvers 122a1 to 122a5 serve to block the stray light SL that can be reflected toward the viewpoint O by the transflective plane mirror 111 and the plane mirror 112, and do not excessively block the view from the viewpoint O. As appropriate. That is, the longer the length of the louvers 122a1 to 122a5, the more the stray light SL can be blocked by one louver, but there is a risk of bothering the viewer due to the parallax between the left and right eyes. On the other hand, the length of each louver can be reduced by providing a plurality of louvers 122a1 to 122a5. In the present embodiment, the five louvers 122a1 to 122a5 serve to block the stray light SL. Although all of the stray light SL is desirably blocked by the louvers 122a1 to 122a5, the effect of improving the visibility can be obtained even when a part of the stray light SL is blocked.

Next, the arrangement positions and angles of the louvers 122a1 to 122a5 will be described with reference to FIG. 6 is a view of the blind spot assisting device 100 as viewed from the upper front side. In FIG. 6, the portions other than the louvers 122a1 to 122a5 of the case body 120 are omitted in order to make the drawing easier to see. .

When the planes of the pair of parallel flat mirrors 110 are viewed from the viewpoint O, each of the louvers 122a1 to 122a5 is viewed as a vertical line in the forward field of view including the blind spot region D. Similarly, the incident side end E11 of the flat mirror 112 is visually recognized as a vertical line in the forward field of view as viewed from the viewpoint O. Further, the incident side end E11 of the plane mirror 112 is reflected by the transflective plane mirror 111, and a plurality of incident side end images E12 to E14 reflected on the plane mirror 112 are similarly viewed from the viewpoint O in the forward field of view. It is visually recognized as a vertical line. If all of these lines are viewed separately, the visibility of the blind spot assisting device 100 may be impaired. On the other hand, in the present embodiment, of the louvers 122a1 to 122a5, the louvers 122a2 to 122a5 are viewed from the viewpoint O defined as the reference viewpoint position, and the incident side end E11 or the incident side end image of the plane mirror 112 is viewed. Even if it is arranged so as to overlap with E12 to E14 and the louvers 122a1 to 122a5 are provided by reducing the vertical line in the front field of view, good visibility is ensured.
Specifically, first, the louvers 122a2 to 122a5 are provided at an angle parallel to the incident side end (incident side side) E11 of the plane mirror 112 when viewed from the plane side of the pair of parallel plane mirrors 110.
The louver 122a2 is arranged on a straight line SA2 connecting the viewpoint O and the incident side end E11 so as to overlap the incident side end E11 when viewed from the viewpoint O. The straight line SA2 reflects the light ML in the order of the semi-transparent plane mirror 111 and the plane mirror 112 in the order of viewing the background through the semi-transparent plane mirror 111 (first time) as viewed from the viewpoint O, and again (2 The second) is a boundary with a region where an image incident on the semi-transmissive flat mirror 111 is visually recognized.
The louver 122a3 is perpendicular to the plane of the pair of parallel plane mirrors 110 from the viewpoint O and the incident side end E11 so as to overlap the image E12 of the incident side end reflected on the plane mirror 112 when viewed from the viewpoint O. Are arranged on a straight line SA3 connecting the point d21 that has moved the distance d between the semi-transmissive flat mirror 111 and the flat mirror 112 twice. In the straight line SA3, the light ML is reflected in the order of the image incident on the semi-transmissive flat mirror 111 for the second time, the semi-transmissive flat mirror 111, and the flat mirror 112 in this order, and is incident on the semi-transmissive flat mirror 111 again (third time). This is because the image E12 at the incident side end of the flat mirror 112 is visually recognized on the straight line SA3.
Further, the distance d in the direction perpendicular to the plane of the pair of parallel plane mirrors 110 from the viewpoint O and the point E21 so that the louver 122a4 overlaps the image E13 of the incident side end reflected on the plane mirror 112 when viewed from the viewpoint O. Is arranged on a straight line SA4 connecting the point E31 that has been moved twice more. In the straight line SA4, the light ML is reflected in the order of the image incident on the semi-transmissive flat mirror 111 for the third time, and further in the order of the semi-transmissive flat mirror 111 and the flat mirror 112, and enters the semi-transmissive flat mirror 111 again (fourth time). This is because the image E13 at the incident side end of the plane mirror 112 is visually recognized on the straight line SA4.
Further, the distance d in the direction perpendicular to the plane of the pair of parallel plane mirrors 110 from the viewpoint O and the point E31 is overlapped with the image E14 of the incident side end portion reflected on the plane mirror 112 when the louver 122a5 is viewed from the viewpoint O. Are arranged on a straight line SA5 connecting the point E41 that has been moved twice more. The straight line SA5 is visually reflected in the order of the semi-transparent plane mirror 111 and the semi-transparent plane mirror 111 and the plane mirror 112 in this order, and the image incident on the semi-transparent plane mirror 111 again (fifth) is visually recognized. This is because the image E13 at the incident side end of the plane mirror 112 is visually recognized on the straight line SA5.

Similarly, when the plane of the pair of parallel flat mirrors 110 is viewed from the viewpoint O, the incident side end E10 of the semi-transmissive flat mirror 111 is also viewed as a vertical line in the forward field of view as viewed from the viewpoint O. On the other hand, in the present embodiment, of the louvers 122a1 to 122a5, the louver 122a1 is arranged so as to overlap the semi-transmissive flat mirror 111 when viewed from the viewpoint O defined as the reference viewpoint position, and the vertical direction in the front field of view. Even in the configuration in which the louvers 122a1 to 122a5 are provided by reducing the number of lines, good visibility is ensured.
Specifically, first, the louver 122a1 is provided at an angle parallel to the incident side end (incident side side) E10 of the semi-transmissive flat mirror 111.
The louver 122a1 is arranged on a straight line SA1 connecting the viewpoint O and the incident side end E10 so as to overlap the incident side end E10 when viewed from the viewpoint O. The straight line SA <b> 1 is a boundary between a region where the background is viewed directly from the viewpoint O and a region where the background is viewed via the semi-transmissive flat mirror 111.

When the louvers 122a1 to 122a5 are arranged in this manner, the angles of the louvers 122a1 to 122a5 with respect to the plane of the semi-transmissive flat mirror 111 substantially coincide with the angles θ ₁ to θ ₅ formed by the straight lines SA1 to SA5 and the semi-transmissive mirror 111, respectively. . The angles θ ₁ to θ ₅ increase stepwise from the incident side toward the emission side (in the traveling direction of the light ML of the pair of parallel flat mirrors 110) (θ ₁ <θ ₂ <θ ₃ <θ _4). <Θ ₅ ).

As the shape of the louvers 122a1 to 122a5, it is desirable to form the louvers 122a1 to 122a5 so that the thickness on the viewer side is gradually thinner than the thickness on the transflective flat mirror 111 side (to be a wedge shape). As a result, even if the viewer's actual viewpoint slightly changes with respect to the viewpoint O, the width of the louvers 122a1 to 122a5 visually recognized by the viewer is within the range corresponding to the wedge angle of the louvers 122a1 to 122a5. Therefore, stable visibility can be maintained.

As shown in FIGS. 5 and 6, a gap A is provided between the transflective flat mirror 111 and the louvers 122a1 to 122a5. That is, the louvers 122a1 to 122a5 are arranged so as not to contact the transflective flat mirror 111. As a result, it is possible to prevent image distortion and abnormal noise caused by the contact of the louvers 122a1 to 122a5. Note that the length (size) of the gap A is arbitrary.

Next, the definition of the length of each of the louvers 122a1 to 122a5 when the gap A is provided between the transflective flat mirror 111 and the louvers 122a1 to 122a5 will be described with reference to FIGS. 7 and 8 are enlarged views of the main part of the blind spot assisting device 100 according to the present embodiment, and FIG. 9 is an enlarged view of the main part of the blind spot assisting apparatus according to the comparative example. 7 and 9, only the louvers 122a2 and 122a3 are shown among the plurality of louvers 122a1 to 122a5, but the same applies to the other louvers 122a1, 122a4, and 122a5.

As shown in FIG. 9, when the gap A is provided between the transflective flat mirror 111 and the louvers 122a2 and 122a3, if the length of the louver 122a2 is short, a part of the stray light SL is separated from the transflective flat mirror 111. There is a possibility that the light passes through the gap A between the louver 122a3 and enters the semi-transmissive reflective surface of the semi-transmissive flat mirror 111, and is reflected toward the viewer's viewpoint O, thereby reducing visibility.

On the other hand, in the present embodiment, each of the plurality of louvers 122a1 to 122a4 is connected to another louver in the traveling direction of the light ML in the pair of parallel flat mirrors 110 among the plurality of louvers 122a1 to 122a5 from the viewer side. The stray light SL that is incident on the semi-transmissive flat mirror 111 through the gap A between the 122a2-122a5 and the semi-transmissive flat mirror 111 and that is reflected toward the viewer's viewpoint O can be blocked. We decided to provide it.
Specifically, as shown in FIG. 7, the minimum length L2 of the _second louver 122a2 from the incident side of the light ML that satisfies the above conditions can be defined as follows. First, an end point far from the viewer of the third louver 122a3 (another louver with respect to the louver 122a2) from the incident side of the light ML is drawn at a point P3, and a perpendicular drawn from the point P3 to the semi-transmissive reflective surface of the semi-transmissive flat mirror 111. And the semitransparent reflection surface of the semitransparent plane mirror 111 is the intersection of the line segment OR3 drawn from the viewpoint O to the point R3 and the semitransparent reflection surface of the semitransparent reflection mirror 111. S3, the intersection of the straight line SA2 that is the angle reference line of the louver 122a2 and the semi-transmissive plane mirror 111 is the point T2, the intersection of the straight line SA2 and the line connecting the point S3 and the point P3 is the semi-transparent plane from the point U2 and the point U2. point of intersection between the viewer-side of the plane of the perpendicular line drawn against viewer side of the plane semitransparent plane mirror 111 V2 of the mirror 111, the distance from point U2 and point V2 and B _2. In this case, the minimum length L ₂ of the louvers 122a2 is the point T2, one of the interior angles will tie points U2 and point V2 analogous to right triangle at an angle theta _2, the length of the interior angles of opposite sides are B ₂ - Since it coincides with the length of the hypotenuse of the right triangle of A, it can be expressed by the following formula 1.

Of the stray light SL that is reflected by the semi-transmissive reflecting surface of the semi-transmissive flat mirror 111 and reaches the viewpoint O, the stray light SL that passes through the gap A between the louver 122a3 and the semi-transmissive flat mirror 111 passes through points S3 and P3. to enter the semi-transmissive reflecting surface at a deep angle than the straight line connecting, by setting the minimum length L ₂ of the louvers 122a2 as described above, can be blocked such stray light SL louver 122a2. Incidentally, the actual length of the louver 122a2 may be at minimum length L ₂ or more are set as above, substantially equal to the minimum length L ₂ from the viewpoint of the order not to inconvenience the viewer Desirable length (including equal case).

Similarly, the length of the louvers 122a1, 122a3 and 122a4 can be set.
Specifically, as shown in FIG. 8, the length L _(i) of the i-th louver 122a (i) from the incident side of the light ML can be defined as follows (i is a positive integer). Is). First, among the rear end surfaces of the (i + 1) th other louver 122a (i + 1) from the incident side of the light ML, the end point far from the viewer is the point P (i + 1), and the point P (i + 1) from the plane of the semi-transmissive flat mirror 111 The intersection of the perpendicular drawn and the transflective surface is the point Q (i + 1), the point P (i + 1) is folded back at the point Q (i + 1), the point R (i + 1), and the point R (i + 1) from the viewer's viewpoint O ) Is the intersection of the line segment OR (i + 1) drawn to the semitransparent reflection surface of the semitransparent plane mirror 111 and S (i + 1), and the straight line SA (i) that is the angle reference line of the i-th louver 122a (i) The point of intersection with the semi-transmissive flat mirror 111 is the point T (i), the point of intersection of the straight line SA (i) connecting the point S (i) and the point P (i) is the point U (i), and the point U (i ) To the viewer-side plane of the semi-transmissive flat mirror 111 and the semi-transmissive flat mirror 111 intersection point V between the viewer side of the plane of the (i), the distance from the point U (i) to the point V (i) and _{B (i).} At this time, the minimum length L _(i) of the i-th louver 122a (i) connects the point T (i), the point U (i), and the point V (i), and one of the inner angles is the angle θ _{(i )} was similar to the right triangle is, since the length of the interior angles of opposite sides are matched to the length of the hypotenuse of a right triangle is B _{(i) -A,} may be represented by the formula 2 below.

The actual length of the i-th louver 122a (i) may be equal to or longer than the minimum length L _(i) set as described above, but from the viewpoint of not bothering the viewer. It is desirable that the length be approximately equal to (including the case of being equal to _{) the} minimum length L _(i) .

Of the plurality of louvers 122a1 to 122a5, the fifth louver 122a5 from the incident side of the light ML located closest to the light ML exit side has no louver corresponding to the other louvers. It is set to an arbitrary length.

The blind spot assisting device 100 configured as described above is a blind spot assisting device 100 that displays an image of the blind spot area D that is blocked by an obstacle in the vehicle 1.
A light ML representing the image is incident, a semi-transmission plane mirror 111 provided on the viewer side that reflects a part of the light ML and transmits a part thereof, and a plane mirror 112 that reflects the light ML to the semi-transmission plane mirror 111. A pair of parallel flat mirrors 110 arranged so as to face each other;
Louvers 122a1 to 122a5 which are provided on the viewer side of the semi-transmissive flat mirror 111 and block stray light SL incident on the semi-transmissive flat mirror 111 from the viewer side at a predetermined angle;
A gap A provided between the transflective flat mirror 111 and the plurality of louvers 122a1 to 122a5.
As a result, the visibility can be improved without causing the distortion of the visually recognized image and the generation of abnormal noise caused by the contact of the plurality of louvers 122a1 to 122a5.

In addition, each of the plurality of louvers 122a1 to 122a4 is semi-transparent with the other louvers 122a2 to 122a5 adjacent to each other in the traveling direction of the light ML in the pair of parallel plane mirrors 110 among the plurality of louvers 122a1 to 122a5 from the viewer side. The stray light SL is incident on the transflective flat mirror 111 via the gap A between the mirror 111 and is provided with a length capable of blocking the stray light SL reflected toward the viewer's viewpoint O.
According to this, even if it is a case where the clearance gap part A is provided, the fall of visibility can be suppressed and the stable visibility can be maintained.

In addition, this invention is not limited by the said embodiment and drawing. It goes without saying that changes (including deletion of components) can be added to the embodiment and the drawings. For example, the louvers 122a1 to 122a5 may be disposed so as to be manually adjustable by arranging the louvers 122a1 to 122a5 through shaft portions. In this case, if all the louvers 122a1 to 122a5 are inclined close to the plane of the semi-transmissive flat mirror 111 and the planes of the semi-transmissive flat mirror 111 are covered by the louvers 122a1 to 122a5, then the louvers 122a1 to 122a5 are half-cut when not in use. It is possible to prevent dust and dirt from adhering to the transmission flat mirror 111, and to prevent scratches and damage. Further, the front case 122 including the louvers 122a1 to 122a5 may be made of a flexible material such as silicone. According to this, the front case 122 can be easily attached and detached, the front case 122 can be easily removed to remove the dirt on the semi-transmissive flat mirror 111, and the color and the design can be varied so that the viewer likes it. Convenience is also high when exchanging depending on the situation. Further, when a viewer or the like mistakenly contacts the blind spot assisting device 100, the function as a buffer member can be achieved. In the present embodiment, the space between the pair of parallel plane mirrors 110 is hollow, but a transparent base material (translucent member) is filled between the pair of parallel plane mirrors 110. A solid structure may be obtained by providing a pair of parallel plane mirrors 110 on a pair of opposing surfaces of the light transmitting member). Thereby, dust and dirt can be prevented from adhering to the inner surfaces of the pair of parallel flat mirrors 110.

The blind spot assisting device 100 of the present embodiment is disposed on the right front pillar 50 as viewed from the driver's seat side of the vehicle 1, but a similar blind spot assisting device is also disposed on the left front pillar 60. Also good. Further, as an obstacle in the vehicle, it may be a blind spot assisting device that is arranged on a center pillar, a rear pillar, or the like in addition to the front pillar and displays an image of a blind spot area blocked by these.

Further, the present invention can be widely applied as a blind spot assisting device that projects an image of a blind spot area blocked by an obstacle in fields other than vehicles. For example, when the blind spot assisting device of the present invention is used in a house, a large area blind spot assisting device is attached to the ceiling and only the incident part is exposed to the outside from the wall or the like. Can also see the sunlight from the ceiling indoors. It is particularly suitable for densely populated houses and houses with circumstances where ordinary windows cannot be attached.
Also, for example, in a high-rise building such as a tourist facility, a blind spot auxiliary device with a large area is embedded under the floor of a high floor, and only the light incident part is exposed outdoors, so that the blind spot auxiliary device under the floor directly puts the scenery under the eyes You can feel and emphasize the height of the building. In order to obtain the same effect, conventionally, it was necessary to provide a space under the floor. However, the blind spot assisting device of the present invention is suitable because it can be easily arranged in an existing building.
In addition, as an example to be used for the wall surface, the blind spot assisting device of the present invention is arranged at the corner of the fence at an intersection where the fence is standing near the road and the line of sight is bad. Can quickly recognize the existence of, and contribute to the prevention of encounter accidents.
As described above, the blind spot assisting device of the present invention secures a space for a light incident portion in a blind spot area that is obstructed by an obstacle that has not been visible until now without requiring energy such as electric power. It can be seen as if the obstacles are seen through a wide range, and its use can be widely applied both indoors and outdoors, and it can obtain various effects such as health, safety or impression. .

The present invention is suitable for a blind spot assisting device that displays an image of a blind spot area obstructed by an obstacle.

DESCRIPTION OF SYMBOLS 1 Vehicle 100 Blind spot auxiliary | assistance apparatus 110 A pair of parallel plane mirror (a pair of mirror)
111 Transflective flat mirror (semi-transmissive mirror)
112 Flat mirror (mirror)
120 Case body 121 Rear case 122 Front case 122a1 to 122a5 Louver (shading part)
A Gap O Viewpoint

Claims

A blind spot assisting device that projects an image of a blind spot area obstructed by an obstacle,
Arranged so that a semi-transmission mirror that receives light representing the image, is provided on the viewer side, reflects a part of the light, and transmits a part of the light, and a mirror that reflects the light to the semi-transmission mirror face each other. A pair of mirrors,
A plurality of light shielding portions that are provided on the viewer side of the semi-transmissive mirror and block light incident on the semi-transmissive mirror at a predetermined angle from the viewer side;
A blind spot assisting device comprising: a gap portion provided between the semi-transmissive mirror and the plurality of light shielding portions.
Each of the plurality of light shielding portions includes the gap portion between the semi-transparent mirror and another light shielding portion adjacent to the light traveling direction of the pair of mirrors among the plurality of light shielding portions from the viewer side. 2. The blind spot assisting device according to claim 1, wherein the blind spot assisting device is provided with a length capable of blocking light that is incident on the semi-transmissive mirror and reflected toward the viewpoint of the viewer.