JP6413702B2 - Blind spot assist device - Google Patents

Description

  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 visual recognition device that displays a blind spot caused by an obstacle such as a front pillar in a vehicle. The visual recognition device includes a first mirror that reflects the front of the vehicle and a second mirror that reflects light incident on the first mirror toward the driver, and an image that the driver can see through the direct visual recognition area that sandwiches the front pillar of the vehicle. The first mirror and / or the second mirror can be adjusted so that the images reflected on the second mirror are continuous.

JP 2006-231998 A

  However, in the visual recognition device according to Patent Document 1, it is necessary to adjust the positional relationship between the first and second mirrors so as not to obstruct the second mirror and the landscape when viewed from the driver. There was a problem that it was complicated.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a blind spot assisting device that can more easily project an image of a blind spot area continuously with an image directly viewed by a viewer. 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 obstructed by an obstacle in a vehicle,
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,
An optical member that refracts light representing the image and makes it incident on the pair of mirrors ,
The optical member has an optical axis that overlaps a line connecting the viewer's viewpoint and an arbitrary point in the blind spot area, and is formed of a part of a virtual lens having a focal length equal to the distance to the point. It is characterized by.

  According to the present invention, it is possible to more easily display the image of the blind spot area continuously with the image directly viewed by the viewer.

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 top view which shows a blind spot auxiliary device same as the above. It is a top view which shows the blind spot auxiliary | assistance apparatus which is a comparative example. It is a top view which shows another example of the blind spot auxiliary device which concerns on embodiment of this invention. It is a top view which shows the other another example of a blind spot auxiliary | assistance apparatus same as the above. It is a figure which shows the other another example of a blind spot auxiliary | assistance apparatus same as the above.

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

  FIG. 1 is a view 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, the 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. FIG. 2 shows a state in which the viewer is seated in the driver's seat, and viewpoint 2 shows the viewer's viewpoint (eye point). FIG. 3 is a perspective view showing a pair of parallel flat mirrors 110 of the blind spot assisting device 100.
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 A that is blocked by the front pillar 50 and the black ceramic portion 21. The image of 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.

  As shown in FIG. 2, the blind spot assisting device 100 includes a pair of parallel flat mirrors (a pair of mirrors) 110 and an optical member 120.

  The pair of parallel plane mirrors 110 is configured so that a semi-transmission plane mirror (semi-transmission mirror) 111 that reflects a part of incident light L and transmits a part thereof and a plane mirror (mirror) 112 face each other in parallel. It is configured by being arranged. The semi-transmissive flat mirror 111 and the flat mirror 112 are fixed in a parallel positional relationship by being disposed in a case body (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 transflective layer having a reflectance is formed. 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 has a base 111a facing the flat mirror 112 and an extending portion 111b extending from the base 111a. The transflective flat mirror 111 and the flat mirror 112 are stepped in the horizontal direction. Are arranged as follows.

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

  As shown in FIG. 4, the semi-transmissive flat mirror 111 and the flat mirror 112 are configured such that each plane (semi-transmissive reflective surface and reflective surface) is perpendicular to the traveling direction of the light L in the pair of parallel flat mirrors 110. It is formed in a substantially wedge shape so that the width gradually decreases in the traveling direction of the light L 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 incident side end (incident side side) E1 of the semi-transmissive flat mirror 111 and the incident side end (incident side side) E2 of the flat mirror 112 are along the glass surface of the windshield glass 20. Is inclined. This is because the glass is disposed close to the glass surface of the windshield glass 20.

  The optical member 120 is made of, for example, an optical resin material having a predetermined refractive index, and has a function of refracting incident light and emitting it to the outside. In the present embodiment, the optical member 120 has a shape composed of a part of a biconvex lens. The optical member 120 is disposed on the case body so as to be positioned on the incident side of the pair of parallel plane mirrors 110, and refracts the light L from the image M in the blind spot area A to enter the pair of parallel plane mirrors 110. The reason for providing the optical member 120 in this way will be described later in detail.

  Next, the operation of the pair of parallel flat mirrors 110 will be described with reference to FIG.

In FIG. 2, a blind spot area A that is blocked by the front pillar 50 (including the black ceramic portion 21 (not shown)) is generated in the front view of the viewer (viewpoint 2). Therefore, the image M present in the blind spot area A cannot be directly viewed from the viewpoint 2.
On the other hand, the light L from the image M is incident on the pair of parallel plane mirrors 110 through the optical member 120 and is repeatedly reflected between the pair of parallel plane mirrors 110, while a part of the light L is a pair of parallel planes. The light is emitted from the mirror 110 (transmits through the semi-transmissive flat mirror 111 or directly emitted from the flat mirror 112). Note that 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 plane of the pair of parallel plane mirrors 110. Part of the light L emitted from the pair of parallel flat mirrors 110 reaches the viewpoint 2. Therefore, it is possible to view the image M reflected on the plane mirror 112 continuously from the viewpoint 2 through the semi-transparent plane mirror 111 and the landscape that can be directly viewed. In addition, in a small area (portion indicated by hatching) on the back side of the plane mirror 112 in the blind spot area A, light from this area cannot be incident on the pair of parallel plane mirrors 110, and the image is displayed on the pair of parallel plane mirrors. 110, the image of the blind spot area A can be projected by the pair of parallel plane mirrors 110 in almost all other areas.
Note that when the image of the blind spot area A is projected 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 2) and a pair of parallel planes. The mirror 110 is arranged so that the image M of the blind spot area A is reflected, that is, the angle of the pair of parallel plane mirrors 110 is adjusted so that the light L from the blind spot area A reaches the viewpoint 2. Since the mutual positional relationship between the transflective flat mirror 111 and the flat mirror 112 is fixed, a pair of parallel flat mirrors 110 can be simultaneously arranged by a single placement operation, and a pair of parallel mirrors can be obtained by a single adjustment operation. The angle of the plane mirror 110 can be adjusted simultaneously.

  Next, the function of the optical member 120 is demonstrated using FIG.4 and FIG.5. FIG. 4 is a plan view showing a blind spot assisting device 100 according to the present embodiment, and FIG. 5 is a plan view showing a blind spot assisting device 101 as a comparative example.

The blind spot assisting device 101 does not include the optical member 120 on the incident side of the pair of parallel flat mirrors 110, and has the same configuration as the blind spot assisting device 100 other than that. In the blind spot assisting device 101, when the exit side end (exit side) E3 of the plane mirror 112 is viewed from the viewpoint 2, the image of the blind spot area A reflected on the plane mirror 112 with the exit side end E3 as a boundary and the exit. Strictly speaking, there is a deviation between the front scenery directly visible on the right side of the side end E3. This is because the angle of the light L does not change even if the reflection of the light L is repeated between a pair of parallel plane mirrors 110, and the optical path C1 passes through the exit side end E3 from the viewpoint 2 as shown in FIG. An upper image M1 (an image M1 visually recognized at the position of the exit side end E3 if there are no obstacles (in this embodiment, the front pillar 50 and the black cera portion 21)) and a pair of parallel flat mirrors 110 from the viewpoint 2 The optical path C2 after being emitted from the optical path C1 and the pair of parallel plane mirrors 110 between the image M2 on the optical path C2 that passes through the path M2 (image M2 reflected on the exit side end E3 of the plane mirror 112). This is because a gap W of ₁ minute occurs. The spacing W ₁ between the optical path C1 and the optical path C2 is constant regardless of the distance to the image M1, M2, from the viewpoint 2 (the larger image to be visually recognized) The smaller distance to the image M1, M2 relatively The displacement is felt larger, and the larger the distance (the smaller the image to be visually recognized), the less the displacement is felt (theoretically, when an image at infinity is visually recognized, there is no displacement). However, for example, when the vehicle 1 turns to the right, the image that the viewer should be aware of in the blind spot area A, such as being on the road of the vehicle 1, is about 10 m from the vehicle 1, and although the image of the blind spot area A can be projected, it is safe. From the standpoint of further improving the performance, the difference between the image reflected on the flat mirror 112 and the forward scenery directly visible cannot be ignored.

In order to solve the above problem, the inventor of the present application has come up with the idea that the optical member 120 is disposed on the incident side of the pair of parallel flat mirrors 110 in the blind spot assisting device 100 as described above.
As shown in FIG. 4, the optical member 120 to be arranged has an optical path C1 that is a line connecting the viewpoint 2 and an arbitrary image M1 (for example, a position about 10 m ahead of the vehicle 1) as an optical axis, and its center point P1. It comprises a portion of the virtual lens 120A is a focal length equal to the distance D ₁ of the up image M1 from. In this case, since the optical path C1 passing from the viewpoint 2 through the emission side end E3 and the optical path C3 emitted from the viewpoint 2 via the pair of parallel flat mirrors 110 are parallel to each other, the optical paths C1 and C3 are virtually When the optical path C3 is extended through the correct lens 120A, the optical path C3 is refracted by the virtual lens 120A, and intersects the optical path C1 at the focal plane of the virtual lens 120A, that is, the point of the image M1. Therefore, by arranging the optical member 120 made up of a part of the virtual lens 120A on the incident side of the pair of parallel plane mirrors 110, when the viewer visually recognizes the image M1, the image reflected on the plane mirror 112 is directly visually recognized. You can eliminate the gap between the front landscape. Note that the deviation between the image reflected on the flat mirror 112 and the directly viewed front landscape gradually decreases as the position of the image reflected on the flat mirror 112 is farther from the blind spot assisting device 100 (positioned forward), and the image M1. Displacement disappears at position. The deviation gradually increases as the position is further away from the position of the image M1. Therefore, if the position is in the vicinity of the image M1, the effect of reducing the shift can be sufficiently obtained.

The blind spot assisting device 100 configured as described above is a blind spot assisting device 100 that projects an image of the blind spot area A that is obstructed by the obstacles (the front pillar 50 and the black ceramic portion 21), and is incident with light L representing the image. The semi-transmissive flat mirror 111 provided on the viewer side that reflects part of the light L and transmits part of the light L and the flat mirror 112 that reflects the light L to the semi-transmissive flat mirror 111 are arranged so as to face each other. A pair of parallel plane mirrors 110, and an optical member 120 that refracts light L representing an image and makes it incident on the pair of parallel plane mirrors 110.
Accordingly, since the semi-transmissive flat mirror 111 is used as one of the pair of parallel flat mirrors 110, the viewer can visually recognize the image and landscape of the image M reflected on the flat mirror 112 through the semi-transmissive flat mirror 111. The degree of freedom of the arrangement position of the parallel plane mirror 110 is increased, and the image of the blind spot area A can be projected more easily and continuously with the image (landscape) directly viewed by the viewer. In addition, since a camera that captures the blind spot area A and a display that displays the captured image are unnecessary, the cost is lower than when these are used. Further, by arranging the optical member 120 that refracts the light L representing the image and makes it incident on the pair of parallel flat mirrors 110, the front directly viewing the image reflected on the flat mirror 112 at the exit side end E3 of the flat mirror 112. Deviation from the landscape can be reduced.

The optical member 120 has an optical axis that overlaps a line (optical path C1) connecting the viewer's viewpoint 2 and an arbitrary point (image M1) in the blind spot area A, and the focal distance is a distance D to the point. _It consists of a part of a virtual lens 120A equal to ₁ .
According to this, it is possible to eliminate the deviation between the image reflected on the plane mirror 112 theoretically and the forward scenery directly visible.

  Next, another example of the blind spot assisting device 100 of the present embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part which is the same as that of the above-mentioned embodiment, or the detailed description is abbreviate | omitted.

The blind spot assisting device 100 in another example is different from the above-described embodiment in that a wedge-shaped prism (including a wedge prism or a triangular prism) 130 is used as an optical member.
As shown in FIG. 6, when the wedge-shaped prism 130 is disposed on the incident side of the pair of parallel plane mirrors 110, the light L from the blind spot area A is refracted at a predetermined angle by the wedge-shaped prism 130, and the pair of parallel plane mirrors 110. Is incident on. Therefore, the optical path C4 from the viewpoint 2 via the pair of parallel plane mirrors 110 and the wedge prism 130 to the blind spot area A is an optical path when there is no wedge prism 130 from an arbitrary point P2 on one surface of the wedge prism 130. The light is emitted while being inclined toward the front side by an angle θ1 with respect to C2. Therefore, setting the optical path C4 is, the optical path C1 and arbitrary image M1 passing through the exit side end E3 of the view 2 (e.g., from the vehicle 1 10 m approximately forward position) the apex angle theta _W of the wedge prism 130 to intersect with By doing so, it is possible to eliminate a deviation between the image reflected on the flat mirror 112 and the front scenery directly visible when the viewer visually recognizes the image M1.
The angle (deflection angle) θ ₁ of the optical path C 4 with respect to the optical path C 2 when emitted from the point P 2 of the wedge-shaped prism 130 to the blind spot area A is expressed by the following formula 1 when the apex angle θ _W is small.
(Formula 1) θ ₁ = (n−1) θ _W
Note that n is the refractive index of the wedge prism 130. Further, when the optical path C4 intersects with the optical path C1 at the position of the image M1, the angle θ ₂ formed by the optical path C1 and the optical path C4 has a complex angle relationship with the angle θ ₁ and is expressed by the following formula 2.
(Formula 2) θ ₂ = θ ₁
Furthermore, the angle θ ₂ is defined as an intersection between the optical path C1 and the perpendicular p of the optical path C1 passing through the point P2 of the wedge-shaped prism 130 from which the optical path C4 is emitted, and an interval between the point P2 and the intersection H (that is, the length of the perpendicular p). is) as the W _2, and the distance from the intersection point H to the position of the image M1 and D _2, the formula 3 below.
(Expression 3) θ ₂ = tan ⁻¹ (W ₂ / D ₂ )
The apex angle θ _W of the wedge prism 130 can be expressed by the following equations 4 and 5, and can be easily set.
(Formula 4) (n−1) θ _W = tan ⁻¹ (W ₂ / D ₂ )
(Formula 5) θ _W = {tan ⁻¹ (W ₂ / D ₂ )} / (n−1)

  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. As the optical member of the present invention, a tablet lens or a triplet lens may be used in addition to the optical member 120 and the wedge-shaped prism 130 formed of a part of the virtual lens 120A.

  When the optical member 120 formed of a part of the virtual lens 120A is used, when the viewpoint 2 moves, the position of the virtual lens 120A also moves. Therefore, a position adjustment mechanism that adjusts the position of the optical member 120 may be provided. FIG. 7 shows an example of the position adjusting mechanism. The position adjustment mechanism 140 includes a left / right position adjustment unit 141 and an angle adjustment unit 142.

The left-right position adjustment unit 141 includes a position adjustment bolt 141 a provided on the transflective flat mirror 111 side of the optical member 120 and an elastic member provided on the flat mirror 112 side of the optical member 120. The position adjusting bolt 141a is inserted into a female screw hole (not shown) formed in the case body and comes into contact with the optical member 120. Note that the contact portion with the position adjustment bolt 141a is provided in a portion that does not affect the visual recognition of the image of the blind spot area A. The elastic member 141b is made of rubber, a spring, or the like, and generates an elastic force that presses the optical member 120 against the position adjusting bolt 141a.
The viewer can move the optical member 120 in the direction of the plane mirror 112 (right direction in FIG. 7) by manually rotating the position adjustment bolt 141a clockwise and pushing it in toward the plane mirror 112. Further, the viewer manually rotates the position adjusting bolt 141a counterclockwise and pulls it out, so that the optical member 120 is moved toward the transflective flat mirror 111 by the elastic force of the elastic member 122 (left direction in FIG. 7). Can be moved to.

The angle adjustment unit 142 has a shaft portion (not shown) orthogonal to the horizontal direction of the vehicle 1 and allows the optical member 120 to turn left and right about this shaft portion. In the present embodiment, the angle adjusting unit 142 adjusts the angle of the optical member 120 by directly rotating the optical member 120 left and right manually by a viewer. Note that an angle of the optical member 120 may be adjusted by providing an operation unit connected to the shaft unit and operating the operation unit.
Thus, by providing the position adjustment mechanism 140 that adjusts the position of the optical member 120, the viewer can adjust the position of the optical member 120 in accordance with the position of the viewpoint 2 of his / her own. Even when the viewpoint 2 moves, such as when they are different from each other, it is possible to reduce the deviation between the image reflected on the flat mirror 112 and the forward scenery directly visible.

Further, the optical member 120 (and the wedge prism 130) may be detachably housed from the case body in order to change the point where there is no deviation between the image reflected on the flat mirror 112 and the directly viewed front landscape. . FIG. 8 shows an example in which the optical member 120 is detachable. FIG. 8A shows a state in which the blind spot assisting device 100 is viewed from the front side (semi-transmissive flat mirror 111 side). b) shows the blind spot assisting device 100 as viewed from the back side (plane mirror 112 side). In FIG. 8, the pair of parallel plane mirrors 110 and the case body 150 are represented by rectangles in order to simplify the drawing. In FIG. 8, the blind spot assisting device 100 includes a case body 150 that houses a pair of parallel flat mirrors 110 and an optical member 120. The case body 150 is a cylindrical member made of, for example, a light shielding resin material. On the front side of the case body 150, a first opening 151 that exposes the semi-transmissive flat mirror 111 and a second opening 152 that exposes the flat mirror 112 are formed. A third opening 153 that exposes the optical member 120 and introduces the light L from the blind spot area A is provided on the back side of the case body 150. Furthermore, the case body 150 is provided with a slit portion 154 above the optical member 120, and the optical member 120 is detachably accommodated from the slit portion 154.
In this way, by storing the optical member 120 so as to be detachable from the case body 150, the optical member 120 can be easily replaced according to the point (distance) at which the most deviation is desired, and the convenience is further improved. Can do.

  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. . Note that the degree of refraction by the optical member is also appropriately set according to the distance most important in the application of the blind spot assisting device.

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

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Viewpoint 100 Blind spot auxiliary | assistance apparatus 110 A pair of parallel plane mirror (a pair of mirror)
111 Transflective flat mirror (semi-transmissive mirror)
111a base 111b extension 112 flat mirror (mirror)
120 Optical member 120A Virtual lens 130 Wedge prism (optical member)
140 Position Adjustment Mechanism 141 Left / Right Position Adjustment Unit 141a Position Adjustment Bolt 141b Elastic Member 142 Angle Adjustment Unit 150 Case Body 151 First Opening 152 Second Opening 153 Third Opening 154 Slit

Claims (3)

A blind spot assisting device that displays an image of a blind spot area obstructed by an obstacle in a vehicle,
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,
An optical member that refracts light representing the image and makes it incident on the pair of mirrors ,
The optical member has an optical axis that overlaps a line connecting the viewer's viewpoint and an arbitrary point in the blind spot area, and is formed of a part of a virtual lens having a focal length equal to the distance to the point. A blind spot assist device characterized by.   The blind spot assisting device according to claim 1, further comprising a position adjusting mechanism that adjusts a position of the optical member. A case body that houses the pair of mirrors and the optical member;
The blind spot assisting device according to claim 1, wherein the optical member is detachably accommodated from the case body.

Images