Optical member

Abstract

To provide an optical member which suppresses deterioration in recognition for sight of a dead angle area.SOLUTION: When an inclination angle of a first reflection surface with respect to a first direction Da1 is γr and a line segment between a viewer and a transparent material on a cross section orthogonal to the first direction Da1 is Lb in a rotation direction around an axis extending in a normal line Dn regarding an optical member 10, and when an inclination angle of Lb with respect to a second direction Da2 is β in a rotation direction around an axis extending in the first direction Da1, the first reflection surface satisfies the relation expression: 10°≤arctan(tanγr×sinβ)≤90°. When an inclination angle of a light shielding layer with respect to the first direction Da1 is γ in a rotation direction around an axis extending in the normal line Dn, the light shielding layer satisfies the relation expression: 10°≤arctan(tanγ×sinβ)≤90°.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to an optical member.

Background Art

[0002] Conventionally, as described in Patent Document 1, a blind spot assisting device including a semi-transmissive mirror, a mirror, a light-transmissive member, and a prism is known. The semi-transmissive mirror is provided on the viewer side. The mirror reflects light to the semi-transmissive mirror. The light-transmissive member is provided between the semi-transmissive mirror and the mirror. The prism is provided between the semi-transmissive mirror and the viewer. Further, the prism extends in the vertical direction and a plurality of prisms are arranged in the horizontal direction. Each prism includes a light shielding layer on a surface that does not face the light incident surface of the light-transmissive member. The light shielding layer blocks light incident from the viewer side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to the study by the inventors, in the blind spot assisting device described in Patent Document 1, since the prism extends in the vertical direction and a plurality of prisms are arranged in the horizontal direction, the light shielding layer also extends in the vertical direction and a plurality of light shielding layers are arranged in the horizontal direction. Therefore, for example, when the light shielding layer is formed of a black resin and the viewer looks at the blind spot assisting device, the light shielding layer appears as black streaks extending in the vertical direction and arranged in a plurality in the horizontal direction.

[0005] Here, when a viewer views a scene, since the viewer's two eyes are located on the left and right, if periodic stripes in the vertical direction are present at different distances from the scene, in human visual processing, the viewer's eyes will fuse with these stripes, increasing the conspicuity, which is the ease of recognition of the stripes by the viewer. As a result, the fusion of the scene by binocular vision is inhibited. Also, due to the left - right movement of the viewer's two eyes, the moiré pattern generated by the vertical stripes of the periodic structure moves, increasing the conspicuity. Therefore, the recognition of the scene in the blind - spot area shown in the blind - spot assisting device decreases, and the visibility of the scene in the blind - spot area deteriorates.

[0006] Also, here, according to the study by the inventors, in the blind - spot assisting device described in Patent Document 1, since a semi - transparent mirror is provided, and the semi - transparent mirror has a dielectric multilayer film or the like, the number of parts of the blind - spot assisting device increases. For this reason, since the cost of the blind - spot assisting device increases, it is desired that the blind - spot assisting device does not include a semi - transparent mirror in order to reduce the cost of the blind - spot assisting device.

[0007] In order to make the blind - spot assisting device not include a semi - transparent mirror, it is conceivable to reflect light on the surface of a light guide formed between prisms instead of the semi - transparent mirror. However, in this case, since the prisms extend in the vertical direction and are arranged in a plurality in the horizontal direction, this reflecting surface also extends in the vertical direction and is arranged in a plurality in the horizontal direction. At this time, the reflecting surface appears as stripes extending in the vertical direction and arranged in a plurality in the horizontal direction. Therefore, due to the reflecting surface, similarly to the above, the conspicuity, which is the ease of recognition of the stripes by the viewer, increases. As a result, the recognition of the scene in the blind - spot area shown in the blind - spot assisting device decreases, and the visibility of the scene in the blind - spot area deteriorates.

[0008] An object of the present disclosure is to provide an optical member that suppresses a decrease in recognition of a scene in a blind - spot area.

Means for Solving the Problem

[0009] The invention according to claim 1 is an optical member attached to an attachment member (5), comprising: an incident surface (25) on which external scene light (Lo) from a blind spot region is incident; a first reflection surface (31, 311) that reflects light from the incident surface; a second reflection surface (32) that reflects the light reflected by the first reflection surface; an emission portion (40) that emits the light from the incident surface and the light reflected by the second reflection surface to the outside; a first rough surface (201) that intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface. When a direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflection surface is defined as a first direction (Da1), and a direction orthogonal to the normal direction and the first direction is defined as a second direction (Da2), the emission portions are arranged in a plurality with a predetermined interval in the second direction, and the first reflection surfaces are arranged in a plurality with a predetermined interval in the second direction by being formed between adjacent emission portions. In the rotational direction around an axis extending in the normal direction, when the inclination angle of the first reflection surface with respect to the first direction is γr, a line segment connecting the viewer and the light guide body in a cross-section in a direction orthogonal to the first direction is defined as Lb, and in the rotational direction around an axis extending in the first direction, when the inclination angle of Lb with respect to the second direction is β, The first reflection surface is

Number

[0010] Furthermore, the invention according to claim 3 is an optical member attached to the attachment member (5), which includes an incident surface (25) for incident external scene light (Lo) from a blind spot area, a first reflecting surface (31, 311) for reflecting the light from the incident surface, a second reflecting surface (32) for reflecting the light reflected by the first reflecting surface, an emitting surface (42) for emitting the light from the incident surface and the light reflected by the second reflecting surface to the outside, and a non-emitting surface (45) connected to the emitting surface, and an emitting portion (40) including the non-emitting surface; a first rough surface (201) intersecting and connected to the incident surface, the first reflecting surface, and the second reflecting surface; and a second rough surface (202) disposed on the side opposite to the first rough surface and intersecting and connected to the incident surface, the first reflecting surface, and the second reflecting surface. The optical member further includes a light shielding portion (60) for shielding the light from the outside of the light guide to the emitting portion by covering the non-emitting surface. When the direction from the first rough surface to the second rough surface and orthogonal to the normal direction (Dn) of the first reflecting surface is defined as the first direction (Da1), and the direction orthogonal to the normal direction and the first direction is defined as the second direction (Da2), the emitting portions are arranged in a plurality in the second direction, and the light shielding portions are arranged in a plurality in the second direction by covering the non-emitting surfaces. In the rotational direction around the axis extending in the normal direction, when the inclination angle of the non-emitting surface and the light shielding portion with respect to the first direction is γ, and in the cross-section in the direction orthogonal to the first direction, the line segment connecting the viewer and the light guide is Lb, and in the rotational direction around the axis extending in the first direction, when the inclination angle of Lb with respect to the second direction is β, The non-emitting surface and the light shielding portion are

Number

[0011] Furthermore, the invention according to claim 6 is an optical member attached to the attachment member (5), which includes an incident surface (25) for incident external scene light (Lo) from a blind spot region, a first reflection surface (31, 311) for reflecting the light from the incident surface, a second reflection surface (32) for reflecting the light reflected by the first reflection surface, an emission part (40) for emitting the light from the incident surface and the light reflected by the second reflection surface to the outside, a first rough surface (201) intersecting and connected to the incident surface, the first reflection surface, and the second reflection surface, and a second rough surface (202) disposed on the side opposite to the first rough surface and intersecting and connected to the incident surface, the first reflection surface, and the second reflection surface. When the direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflection surface is defined as the first direction (Da1), and the direction orthogonal to the normal direction and the first direction is defined as the second direction (Da2), the emission parts are arranged in a plurality at a predetermined interval in the second direction, and the first reflection surfaces are arranged in a plurality at a predetermined interval in the second direction by being formed between adjacent emission parts. In the rotational direction around the axis extending in the front-rear direction of the viewer, when the inclination angle of the first reflection surface with respect to the vertical direction is ωr, and in the rotational direction around the axis extending in the left-right direction of the viewer, when the inclination angle of the first reflection surface with respect to the vertical direction is γr, and in the cross-section in the direction orthogonal to the vertical direction, when the line segment connecting the viewer and the light guide is Lb, and in the rotational direction around the axis extending in the vertical direction, when the inclination angle of Lb with respect to the front-rear direction is β, The first reflection surface is

Number

[0012] Furthermore, the invention according to claim 8 is an optical member attached to the attachment member (5), which includes an incident surface (25) on which external scene light (Lo) from a blind spot region is incident, a first reflection surface (31, 311) that reflects light from the incident surface, a second reflection surface (32) that reflects the light reflected by the first reflection surface, an emission surface (42) that emits the light from the incident surface and the light reflected by the second reflection surface to the outside, and a non-emission surface (45) connected to the emission surface, an emission part (40); a first rough surface (201) that intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface, a light guide (20); and a light shielding part (60) that shields light from the outside of the light guide toward the emission part by covering the non-emission surface. When the direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflection surface is defined as the first direction (Da1), and the direction orthogonal to the normal direction and the first direction is defined as the second direction (Da2), the emission parts are arranged in a plurality in the second direction, the light shielding parts are arranged in a plurality in the second direction by covering the non-emission surface, when the inclination angle of the non-emission surface and the light shielding part with respect to the vertical direction in the rotation direction around the axis extending in the front-rear direction of the viewer is ω, and the inclination angle of the non-emission surface and the light shielding part with respect to the vertical direction in the rotation direction around the axis extending in the left-right direction of the viewer is γ, and when the line segment connecting the viewer and the light guide in the cross section in the direction orthogonal to the vertical direction is Lb, and the inclination angle of Lb with respect to the front-rear direction in the rotation direction around the axis extending in the vertical direction is β, the non-emission surface and the light shielding part are

Number

[0013] Thereby, when the viewer looks at the light guide, the streaks generated in the optical member appear inclined. For this reason, since the emphasis of the streaks is suppressed, the conspicuity is reduced. Therefore, a decrease in the recognition of the scene in the blind spot region reflected in the optical member is suppressed.

[0014] Note that the reference signs in parentheses attached to each component etc. indicate an example of the correspondence relationship between the component etc. and the specific components etc. described in the embodiments described later.

Brief Description of Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference signs, and the description thereof will be omitted.

[0017] (First Embodiment) The optical member 10 of this embodiment is used, for example, in the vehicle 1. As shown in FIG. 1, this vehicle 1 includes a steering wheel 2, a front window 3, side windows 4, a pillar 5, an optical member 10, and the like. And the optical member 10 is attached to the pillar 5, for example, and guides the external scene light Lo from the area that becomes a blind spot due to the pillar 5 to the occupants of the vehicle 1, so that the occupants of the vehicle 1 can visually recognize the scene in the blind spot area. Note that the occupants of the vehicle 1 correspond to the viewers. Also, the pillar 5 corresponds to the attachment member.

[0018] Specifically, as shown in FIGS. 2 to 6, the optical member 10 includes a light guide 20 and a light shielding layer 60. In FIGS. 2 and the cross-sectional views described later, the cross-sectional hatching of the optical member 10 is omitted for easier understanding.

[0019] The light guide 20 is formed of a light-transmitting material such as a resin material like polyethylene terephthalate, polycarbonate, polyethylene, and acrylic, or glass. Further, the light guide 20 has an incident surface 25, a first reflection surface 31, a second reflection surface 32, a connection surface 33, a plurality of prisms 40, a first rough surface 201, and a second rough surface 202.

[0020] The incident surface 25 is the surface on which the external scene light Lo is incident. The first reflection surface 31 is disposed on the side of the occupants of the vehicle 1 and intersects the incident surface 25. Also, on the first reflection surface 31, the light from the incident surface 25 is reflected. The second reflection surface 32 is connected to the opposite side of the incident surface 25 from the first reflection surface 31 and is parallel to the first reflection surface 31. Further, on the second reflection surface 32, the light reflected by the first reflection surface 31 is reflected. The connection surface 33 is located on the side opposite to the incident surface 25 and intersects and is connected to the first reflection surface 31 and the second reflection surface 32.

[0021] Here, the direction of the normal line passing through the first reflection surface 31 is defined as the normal direction Dn. Here, the normal direction Dn coincides with the left-right direction of the viewer.

[0022] Then, as shown in FIG. 2, the incident surface 25 is inclined with respect to the normal direction Dn. Further, the incident surface angle Asi, which is the inclination angle of the incident surface 25 with respect to the normal direction Dn, is an acute angle. Let the refractive index of the light guide 20 be n1. Also, let the refractive index of the external medium of the light guide 20 be n2. Further, let the incident angle when the light from the incident surface 25 is reflected by the first reflection surface 31 and the incident angle when the light reflected by the first reflection surface 31 is reflected by the second reflection surface 32 be θi. At this time, the light guide 20 is formed so as to satisfy the following relational expression (1-1). Thereby, even if the light guide 20 does not have a semi-transmissive mirror, the light from the incident surface 25 is totally reflected by the first reflection surface 31 and the second reflection surface 32.

[0023] [Number]

[0024] Next, the prism 40 is formed by molding, cutting, blasting, etc. and combinations thereof during the formation of the light guide 20. Also, the prism 40 protrudes from the first reflection surface 31 and is formed in a triangular prism shape. Further, a plurality of prisms 40 are arranged at a predetermined interval. Thereby, the first reflection surface 31 is formed between adjacent prisms 40 and a plurality of first reflection surfaces 31 are arranged at a predetermined interval in the arrangement direction of the prisms 40. Also, the prism 40 corresponds to the injection part and includes a prism emission surface 42 and a prism light shielding surface 45.

[0025] The prism emission surface 42 is connected to the first reflection surface 31. Also, the prism emission surface 42 is parallel to the incident surface 25. For this reason, the prism emission surface 42 is inclined at the incident surface angle Asi with respect to the normal direction Dn.

[0026] The prism light shielding surface 45 corresponds to the non-emission surface and is connected to intersect the prism emission surface 42. Also, the prism light shielding surface 45 is inclined at a light shielding surface angle Ass with respect to the normal direction Dn.

[0027] As shown in FIG. 3, the first rough surface 201 intersects and is connected to the incident surface 25, the first reflection surface 31, and the second reflection surface 32. The second rough surface 202 is disposed on the side opposite to the first rough surface 201, faces the first rough surface 201, and intersects and is connected to the incident surface 25, the first reflection surface 31, and the second reflection surface 32. Also, the surface roughness of the first rough surface 201 and the second rough surface 202 is greater than the surface roughness of the incident surface 25, the first reflection surface 31, and the second reflection surface 32. As a result, it is difficult for light to be reflected by the first rough surface 201 and the second rough surface 202. The surface roughness is, for example, root mean square height, maximum peak height, maximum valley height, maximum height, and arithmetic mean height, etc., and is measured by a measurement method conforming to ISO25178 and JISB0601.

[0028] The light shielding layer 60 corresponds to the light shielding portion and is a light absorption film that absorbs 99% or more of light. Also, the light shielding layer 60 is formed, for example, by painting, printing, vapor deposition, etc. with a black resin. Further, as shown in FIG. 4, the light shielding layer 60 covers the entire surface of each prism light shielding surface 45. As a result, the light shielding layer 60 blocks light incident from the passenger side of the vehicle 1 toward the prism light shielding surface 45. Also, the light shielding layer 60 reduces the interface reflection when the light propagating inside the light guide 20 is incident on the prism light shielding surface 45. Note that the light shielding layer 60 is formed of a black resin, but is not limited to the black resin, and may be formed of, for example, a metal.

[0029] Here, a direction from the first rough surface 201 toward the second rough surface 202 or from the second rough surface 202 toward the first rough surface 201, and a direction orthogonal to the normal direction Dn is defined as the first direction Da1. Here, the first direction Da1 coincides with the up-down direction. Also, the up-down direction is orthogonal to the front-rear direction and the left-right direction of the viewer.

[0030] The prism emission surface 42 and the prism light-shielding surface 45 are inclined with respect to the first direction Da1 at an angle in the rotational direction around the axis extending in the normal direction Dn. For this reason, the first reflection surface 31 and the light-shielding layer 60 are inclined with respect to the first direction Da1 at an angle in the rotational direction around the axis extending in the normal direction Dn. Also, let the inclination angle of the prism emission surface 42 and the prism light-shielding surface 45 with respect to the first direction Da1 in the rotational direction around the axis extending in the normal direction Dn be the prism angle γ. Further, let the inclination angle of the first reflection surface 31 in the rotational direction around the axis extending in the normal direction Dn be the reflection surface angle γr. Also, the outer edge of the pillar 5 is inclined with respect to the first direction Da1 at an angle in the rotational direction around the axis extending in the normal direction Dn. Further, let the inclination angle of the pillar 5 with respect to the first direction Da1 in the rotational direction around the axis extending in the normal direction Dn be the pillar angle Γ. Here, the prism angle γ, the reflection surface angle γr, and the pillar angle Γ are angles in the clockwise direction among the rotational directions around the axis extending in the normal direction Dn, but are not limited thereto. The prism angle γ, the reflection surface angle γr, and the pillar angle Γ may be angles in the counterclockwise direction among the rotational directions around the axis extending in the normal direction Dn.

[0031] Also, let the direction orthogonal to the normal direction Dn and the first direction Da1 be the second direction Da2. Here, the second direction Da2 coincides with the front-rear direction of the viewer. Further, the second direction Da2 coincides with the arrangement direction of the prisms 40.

[0032] Also, as shown in FIG. 5, the center of the light guide 20 in the second direction Da2 is defined as the light guide center Ob. Further, in the cross-section of the light guide 20 in the direction orthogonal to the first direction Da1, a line segment connecting the viewer's eye point Pe and the light guide center Ob is defined as the light guide line segment Lb. Here, since the first direction Da1 coincides with the vertical direction, the light guide line segment Lb corresponds to the line segment connecting the viewer's eye point Pe and the light guide center Ob in the cross-section of the light guide 20 in the direction orthogonal to the vertical direction. Further, in the rotational direction around the axis extending in the first direction Da1, the inclination angle of the light guide line segment Lb with respect to the second direction Da2 is defined as the relative angle β. Note that here, the light guide line segment Lb is the line segment connecting the viewer's eye point Pe and the light guide center Ob, but it is not limited thereto, and it may be the line segment connecting the eye box, which is a predetermined range including the viewer's eye point Pe, and the light guide center Ob.

[0033] And the prism angle γ is equal to or less than the pillar angle Γ, that is, γ ≦ Γ. Further, since the prism angle γ is the same as the reflection surface angle γr, the reflection surface angle γr is equal to or less than the pillar angle Γ, that is, γr ≦ Γ. Also, the prism emission surface 42 and the prism light shielding surface 45 are inclined with respect to the first direction Da1 at an angle in the rotational direction around the axis extending in the normal direction Dn. As a result, as shown in FIG. 6, when the viewer looks at the light guide center Ob, geometrically, in the space with the normal direction Dn and the second direction Da2 as the Cartesian coordinate system, the prism emission surface 42 and the prism light shielding surface 45 can be seen shifted by the value of tan γ × sin β. That is, when the viewer looks at the light guide center Ob, geometrically, in the space with the viewer's front-rear direction and left-right direction as the Cartesian coordinate system, the prism emission surface 42 and the prism light shielding surface 45 can be seen shifted by the value of tan γ × sin β.

[0034] Therefore, when a viewer sees the light guide 20, the prism emission surface 42 and the prism light-shielding surface 45 appear to be inclined with respect to the first direction Da1 at an angle of arctan(tanγ×sinβ) in the rotational direction around the axis extending in the normal direction Dn. The prism emission surface 42 and the prism light-shielding surface 45 are formed so as to satisfy the following relational expression (1-2). Accordingly, the light-shielding layer 60 covering the prism light-shielding surface 45 is formed so as to satisfy the following relational expression (1-2). Further, since the prism angle γ and the reflection surface angle γr are the same, the first reflection surface 31 is formed so as to satisfy the following relational expression (1-3).

[0035]

Number

[0036] As described above, the optical member 10 of the first embodiment is configured. In the optical member 10 of the present embodiment, the scene in the dead angle area due to the pillar 5 is visible to the occupant of the vehicle 1, and the decrease in the recognition of the scene in the dead angle area is suppressed. Next, with reference to FIG. 7, the visibility of the scene in the dead angle area will be described.

[0037] For example, when outside scene light Lo enters the incident surface 25 at an incident angle θo, it is refracted within the light guide 20 to become incident light Li. Note that the incident angle θo is the angle formed by the traveling direction of the outside scene light Lo and the normal direction Dn.

[0038] Furthermore, a part of the incident light Li travels toward the first reflection surface 31 at the incident angle θi and reaches the first reflection surface 31. The incident light Li that has reached the first reflection surface 31 is totally reflected by the first reflection surface 31 and becomes the first reflected light Lr1. Also, the first reflected light Lr1 travels toward the second reflection surface 32 at the incident angle θi and reaches the second reflection surface 32. The first reflected light Lr1 that has reached the second reflection surface 32 is totally reflected by the second reflection surface 32 and becomes the second reflected light Lr2. Furthermore, the second reflected light Lr2 travels toward the prism emission surface 42 and reaches the prism emission surface 42. The second reflected light Lr2 that has reached the prism emission surface 42 is emitted from the prism emission surface 42 at the emission angle θu that is the same as the incident angle θo and becomes the emitted light Lu. Then, when the emitted light Lu travels toward and reaches the occupant of the vehicle 1, the scene in the blind spot area due to the pillar 5 is visually recognized. Note that the incident angle θi is the angle formed between the traveling direction of the incident light Li and the normal direction Dn. The emission angle θu is the angle formed between the traveling direction of the emitted light Lu and the normal direction Dn. Also, since Asi < π / 2 - θi is satisfied, the incident angle θi is larger than the incident angle θo. Thereby, the incident light Li travels toward a wide range of the first reflection surface 31. Furthermore, the inclination angle of the prism light shielding surface 45 with respect to the normal direction Dn is equal to or greater than the incident angle θo. For this reason, since the emitted light Lu is emitted to the outside without being blocked by the prism light shielding surface 45, the loss of the light amount in emission is reduced.

[0039] Also, a part of the incident light Li travels toward the prism emission surface 42 and reaches the prism emission surface 42. The incident light Li that has reached the prism emission surface 42 is emitted from the prism emission surface 42 at the emission angle θu that is the same as the incident angle θo and becomes the emitted light Lu. Then, when the emitted light Lu travels toward and reaches the occupant of the vehicle 1, the scene in the blind spot area due to the pillar 5 is visually recognized.

[0040] As described above, the scene in the blind spot area due to the pillar 5 is visually recognized by the occupant of the vehicle 1. Next, suppression of the reduction in the recognition of the scene in the blind spot area will be described.

[0041] Here, the decrease in the recognition of the scene in the blind spot region will be described using the first optical member for comparison 91. As shown in FIG. 8, the first optical member for comparison 91 includes a first prism for comparison 911 and a first reflecting surface for comparison 912. The first prism for comparison 911 protrudes from the first reflecting surface for comparison 912 in the direction in which the normal line of the first reflecting surface for comparison 912 extends. Further, the first prism for comparison 911 extends in the vertical direction of the paper surface and is arranged in a plurality in the left-right direction of the paper surface. The first reflecting surface for comparison 912 is formed between adjacent first prisms for comparison 911, and thus extends in the vertical direction of the paper surface and is arranged in a plurality in the left-right direction of the paper surface. Furthermore, the light incident on the first optical member for comparison 91 passes through the inside of the first optical member for comparison 91 and is reflected by the first reflecting surface for comparison 912. The light reflected by the first reflecting surface for comparison 912 is reflected on the surface opposite to the first reflecting surface for comparison 912 and enters the first prism for comparison 911, and is emitted from the first prism for comparison 911. As a result, the scene in the blind spot region is visible through the first optical member for comparison 91. At this time, when the viewer looks at the first optical member for comparison 91, the first reflecting surface for comparison 912 appears as stripes extending in the vertical direction of the paper surface and arranged in a plurality in the left-right direction of the paper surface. In FIG. 8, in order to clarify the location of the first reflecting surface for comparison 912, the first reflecting surface for comparison 912 is shown as a dotted pattern.

[0042] Furthermore, here, when the viewer views the scenery, since the viewer's both eyes are on the left and right, if the periodic stripes in the vertical direction exist at different distances from the scenery, in the human visual processing, the viewer will fuse with the stripes, so the conspicuity, which is the ease of recognition of the stripes by the viewer, increases. From this, the fusion of the scenery by binocular vision to the left and right is inhibited. Also, due to the left and right movements of the viewer's both eyes, the moiré generated by the vertical stripes of the periodic structure moves, increasing the conspicuity. Therefore, the recognition of the scene in the blind spot region reflected in the first optical member for comparison 91 decreases.

[0043] In contrast, in the optical member 10 of the first embodiment, the first reflection surface 31 is formed so as to satisfy the above relational expression (1-3). As a result, when the viewer looks at the light guide 20, the streaks due to the first reflection surface 31 appear to be inclined by 10 to 90° with respect to the first direction Da1. For this reason, compared with the case where the streaks due to the first reflection surface 31 are not inclined with respect to the first direction Da1 or are inclined by less than 10°, the emphasis of the streaks is suppressed, so that the conspicuity decreases. Therefore, a decrease in the recognition of the scene in the dead angle region reflected in the optical member 10 is suppressed. Further, since the inclination seen by the viewer changes depending on the position where the viewer looks, it becomes easy to set the optimum reflection surface angle γr for reducing the above-described conspicuity from the above relational expression (1-3).

[0044] Further, in the first embodiment, the following effects are also exhibited.

[0045] [1-1] Here, the decrease in the recognition of the scene in the dead angle region will be described using the comparative second optical member 92 as described in Patent Document 1. As shown in FIG. 9, the comparative second optical member 92 includes a comparative second prism 921 and a comparative light shielding layer 922. The comparative second prism 921 extends in the vertical direction of the paper surface and is arranged in a plurality in the horizontal direction of the paper surface. The comparative light shielding layer 922 covers one surface of the comparative second prism 921. Further, the light incident on the comparative second optical member 92 passes through the inside of the comparative second optical member 92, is incident on the comparative second prism 921, and is emitted from the comparative second prism 921. As a result, in the comparative second optical member 92, the scene in the dead angle region is visible. At this time, when the viewer looks at the comparative second optical member 92, the comparative light shielding layer 922 appears as streaks extending in the vertical direction of the paper surface and arranged in a plurality in the horizontal direction of the paper surface. Due to these streaks, as described above, the conspicuity, which is the ease of recognition of the streaks by the viewer, increases, so that the recognition of the scene in the dead angle region reflected in the comparative first optical member 91 decreases. In FIG. 9, in order to clarify the location of the comparative light shielding layer 922, the comparative light shielding layer 922 is shown as a dotted pattern.

[0046] On the other hand, in the optical member 10 of the first embodiment, the prism light-shielding surface 45 and the light-shielding layer 60 are formed so as to satisfy the above relational expression (1-2). Thereby, for example, when a viewer views the light guide 20, the streaks formed by the light-shielding layer 60 covering the prism light-shielding surface 45 are visible at an angle of 10 to 90° with respect to the first direction Da1. For this reason, compared with the case where the streaks formed by the light-shielding layer 60 are not inclined with respect to the first direction Da1 or are inclined by less than 10°, the emphasis on the streaks is suppressed, and thus the conspicuity is reduced. Therefore, a decrease in the recognition of the scene in the blind spot area reflected in the optical member 10 is suppressed. Also, since the inclination visible to the viewer changes depending on the position where the viewer views, it becomes easier to set the optimal prism angle γ for reducing the above-described conspicuity from the above relational expression (1-2).

[0047] [1-2] The prism angle γ is equal to or less than the pillar angle Γ, that is, γ ≤ Γ. Also, the reflection surface angle γr is equal to or less than the pillar angle Γ, that is, γr ≤ Γ. As a result, in the second direction Da2, it becomes difficult for the light guide 20 to protrude from the pillar 5. For this reason, it becomes difficult for the light guide 20 to come into contact with the outside of the pillar 5 such as the front window 3.

[0048] (Second Embodiment) In the second embodiment, the form of the light guide 20 is different from that of the first embodiment. Other than this, it is the same as the first embodiment.

[0049] Specifically, as shown in FIG. 10, the prism light-emitting surface 42 and the prism light-shielding surface 45 are inclined with respect to the vertical direction at an angle in the rotational direction around the axis extending in the second direction Da2. For this reason, the light guide 20 itself is inclined with respect to the vertical direction at an angle in the rotational direction around the axis extending in the second direction Da2. Also, the normal direction Dn and the first direction Da1 intersect the vertical direction and the left-right direction.

[0050] Here, in the rotational direction around the axis extending in the left - right direction of the viewer, the inclination angles of the prism emission surface 42 and the prism light - shielding surface 45 with respect to the vertical direction are defined as the first prism angle γ. Further, in the rotational direction around the axis extending in the second direction Da2, the inclination angles of the prism emission surface 42 and the prism light - shielding surface 45 with respect to the vertical direction are defined as the second prism angle ω. Also, in the rotational direction around the axis extending in the left - right direction of the viewer, the inclination angle of the first reflection surface 31 with respect to the vertical direction is defined as the first reflection - surface angle γr. In the rotational direction around the axis extending in the second direction Da2, the inclination angle of the first reflection surface 31 with respect to the vertical direction is defined as the second reflection - surface angle ωr. Note that the first prism angle γ corresponds to the above - mentioned prism angle γ and is the same as the first reflection - surface angle γr. The second prism angle ω is the same as the second reflection - surface angle ωr. Further, the first reflection - surface angle γr corresponds to the above - mentioned reflection - surface angle γr. Also, the second direction Da2 coincides with the front - rear direction of the viewer. Furthermore, the first prism angle γ and the first reflection - surface angle γr are angles in the clockwise direction among the rotational directions around the axis extending in the left - right direction of the viewer, but are not limited to this, and may be angles in the counter - clockwise direction among the rotational directions around the axis extending in the left - right direction of the viewer. Also, the second prism angle ω and the second reflection - surface angle ωr are angles in the counter - clockwise direction among the rotational directions around the axis extending in the second direction Da2, but are not limited to this, and may be angles in the clockwise direction among the rotational directions around the axis extending in the second direction Da2. Also, here, the pillar angle Γ is an angle in the clockwise direction among the rotational directions around the axis extending in the left - right direction of the viewer, but is not limited to this, and may be an angle in the counter - clockwise direction among the rotational directions around the axis extending in the left - right direction of the viewer.

[0051] Furthermore, the center of the light - guide body 20 in the second direction Da2 is defined as the light - guide body center Ob. Also, as shown in FIG. 11, in the cross - section of the light - guide body 20 in the direction orthogonal to the vertical direction, the line segment connecting the eye - point Pe of the viewer and the light - guide body center Ob is defined as the light - guide line segment Lb. Further, in the rotational direction around the axis extending in the vertical direction, the inclination angle of the light - guide line segment Lb with respect to the second direction Da2 is defined as the relative angle β.

[0052] The prism emission surface 42 and the prism light-shielding surface 45 are inclined at an angle in the rotational direction around the axis extending in the second direction Da2. As a result, when the viewer looks at the center Ob of the light guide, geometrically, in the space with the front-rear direction and the left-right direction of the viewer as the Cartesian coordinate system, the prism emission surface 42 and the prism light-shielding surface 45 can be seen shifted by the value of S×sinΔ. Here, S is the distance corresponding to the first prism angle γ and the second prism angle ω with respect to the center Ob of the light guide, and is expressed as in the following relational expression (2-1) using the first prism angle γ and the second prism angle ω. Also, Δ is the angle in the rotational direction around the axis extending in the vertical direction when the viewer looks at the center Ob of the light guide, and is expressed as in the following relational expression (2-2) using the relative angle β, the first prism angle γ, and the second prism angle ω. Furthermore, the unit of Δ is °.

[0053] Therefore, when the viewer looks at the light guide 20, in the rotational direction around the axis extending in the left-right direction of the viewer, the prism emission surface 42 and the prism light-shielding surface 45 appear to be inclined with respect to the vertical direction at an angle of arctan(S×sinΔ). And the prism emission surface 42 and the prism light-shielding surface 45 are formed so as to satisfy the following relational expression (2-3). Thereby, the light-shielding layer 60 is formed so as to satisfy the following relational expression (2-3).

[0054] Also, since the first prism angle γ and the first reflection surface angle γr are the same, when the viewer looks at the center Ob of the light guide, geometrically, in the space with the front-rear direction and the left-right direction of the viewer as the Cartesian coordinate system, the first reflection surface 31 can be seen shifted by the value of Sr×sinΔr. Here, Sr is the distance corresponding to the first reflection surface angle γr and the second reflection surface angle ωr with respect to the center Ob of the light guide, and is expressed as in the following relational expression (2-4) using the first reflection surface angle γr and the second reflection surface angle ωr. Also, Δr is the angle in the rotational direction around the axis extending in the vertical direction when the viewer looks at the center Ob of the light guide, and is expressed as in the following relational expression (2-5) using the relative angle β, the first reflection surface angle γr, and the second reflection surface angle ωr. Furthermore, the unit of Δr is °.

[0055] Therefore, when a viewer looks at the light guide 20, the first reflecting surface 31 appears to be inclined with respect to the vertical direction at an angle of arctan(Sr×sinΔr) in the rotational direction around the axis extending in the left - right direction of the viewer. And the first reflecting surface 31 is formed so as to satisfy the following relational expression (2 - 6).

[0056] [Number]

[0057] As described above, the optical member 10 of the second embodiment is configured. Also in the second embodiment, the same effects as those of the first embodiment are achieved.

[0058] (Third Embodiment) In the third embodiment, as shown in FIG. 12, the first rough surface 201 and the second rough surface 202 are orthogonal to the vertical direction. Other than this, it is the same as the second embodiment. Also in this third embodiment, the same effects as those of the second embodiment are achieved. Further, in the third embodiment, the following effects are also achieved.

[0059] [2] The first rough surface 201 and the second rough surface 202 are orthogonal to the vertical direction. Thereby, the length of the light guide 20 in the vertical direction becomes smaller as compared with the case where the first rough surface 201 and the second rough surface 202 are not orthogonal to the vertical direction. For this reason, the enlargement of the light guide 20 is suppressed.

[0060] (Fourth Embodiment) In the fourth embodiment, the light guide 20 does not have the first reflecting surface 31 and the second reflecting surface 32, but has a half - mirror 311 and a reflecting surface 321. Also, the form of the prism 40 is different from that of the first embodiment. Other than this, it is the same as the first embodiment.

[0061] The half mirror 311 includes a dielectric multilayer film or the like, reflects part of the light incident on the half mirror 311, and transmits part of the light incident on the half mirror 311. The surface of the half mirror 311 where light is reflected corresponds to the first reflection surface 31, and the normal direction Dn corresponds to the direction in which the normal of the surface of the half mirror 311 where light is reflected extends. Further, as shown in FIG. 13, the half mirror 311 intersects the incident surface 25 and is disposed between the prism 40 and a later-described reflection surface 321 in the normal direction Dn.

[0062] The reflection surface 321 corresponds to the second reflection surface 32, is connected to the opposite side of the first reflection surface 31 on the incident surface 25, and is parallel to the half mirror 311. Further, at the second reflection surface 32, the light reflected by the half mirror 311 is reflected.

[0063] Since the light guide 20 does not have the first reflection surface 31 but has the half mirror 311, a plurality of prisms 40 are arranged in series in the second direction Da2. Further, the prism light-emitting surface 42 and the prism light-shielding surface 45 are formed so as to satisfy the above relational expression (1-2). Thereby, the light-shielding layer 60 is formed so as to satisfy the above relational expression (1-2).

[0064] As described above, the optical member 10 of the fourth embodiment is configured. Also in the fourth embodiment, the same effects as those of the first embodiment are achieved.

[0065] (Other embodiments) The present disclosure is not limited to the above embodiments, and can be appropriately modified with respect to the above embodiments. Further, in each of the above embodiments, it goes without saying that the elements constituting the embodiments are not necessarily essential except in cases where it is explicitly stated that they are essential and cases where they are considered to be clearly essential in principle.

[0066] In each of the above embodiments, the prism 40 has a triangular prism shape, but is not limited to having a triangular prism shape, and may have, for example, a trapezoidal prism shape.

[0067] In each of the above embodiments, the light-shielding layer 60 is formed of a light-absorbing film. However, the light-shielding layer 60 is not limited to being formed of a light-absorbing film, and may be formed of a light diffusing material, a retroreflective material, or the like.

[0068] In each of the above embodiments, the light guide 20 has the prism 40. However, the light guide 20 is not limited to this, and instead of the prism 40, it may have a diffraction grating or a hologram. Further, in the light guide 20 having the incident surface 25, an incident prism, a diffraction grating, or a hologram may be formed on the incident surface 25.

[0069] In the first to third embodiments above, the second reflecting surface 32 is parallel to the first reflecting surface 31. In contrast, the second reflecting surface 32 is not limited to being parallel to the first reflecting surface 31, and may be in a form that is not parallel to the first reflecting surface 31 according to the distance from the optical member 10 to the viewer. Further, in the fourth embodiment above, the reflecting surface 321 is parallel to the half mirror 311. In contrast, the reflecting surface 321 is not limited to being parallel to the half mirror 311, and may be in a form that is not parallel to the half mirror 311 according to the distance from the optical member 10 to the viewer.

[0070] The above embodiments may be appropriately combined.

[0071] (Features of the present invention) [Claim 1] An optical member attached to an attachment member (5), comprising: an incident surface (25) on which external scene light (Lo) from a dead angle region is incident; a first reflection surface (31, 311) that reflects light from the incident surface; a second reflection surface (32) that reflects the light reflected by the first reflection surface; an emission part (40) that emits the light from the incident surface and the light reflected by the second reflection surface to the outside; a first rough surface (201) that intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface. A first direction (Da1) is defined as the direction from the first rough surface toward the second rough surface and perpendicular to the normal direction (Dn) of the first reflection surface, and a second direction (Da2) is defined as the direction perpendicular to the normal direction and the first direction. The emission parts are arranged in a plurality with a predetermined interval in the second direction, and the first reflection surfaces are arranged in a plurality with a predetermined interval in the second direction by being formed between adjacent emission parts. In the rotational direction around the axis extending in the normal direction, the inclination angle of the first reflection surface with respect to the first direction is γr, a line segment connecting the viewer and the light guide body in the cross section in the direction perpendicular to the first direction is Lb, and in the rotational direction around the axis extending in the normal direction, the inclination angle of Lb with respect to the second direction is β. The optical member is formed to satisfy the relational expression (1). The first reflection surface is [Number] formed to satisfy the following relational expression (1). [Claim 2] In the rotational direction around the axis extending in the normal direction, when the inclination angle of the attachment member with respect to the first direction is Γ, the light guide body is formed to satisfy γr ≦ Γ. The optical member according to Claim 1. [Claim 3] An optical member attached to an attachment member (5), comprising an incident surface (25) on which external scene light (Lo) from a blind spot region is incident, a first reflecting surface (31, 311) that reflects light from the incident surface, a second reflecting surface (32) that reflects the light reflected by the first reflecting surface, an emitting surface (42) that emits the light from the incident surface and the light reflected by the second reflecting surface to the outside, and a non-emitting surface (45) connected to the emitting surface, an emitting portion (40); a first rough surface (201) that intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface, a light guide body (20); and a light shielding portion (60) that shields light from the outside of the light guide body toward the emitting portion by covering the non-emitting surface. In a direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflecting surface, a first direction (Da1) is defined, and a second direction (Da2) is defined as a direction orthogonal to the normal direction and the first direction. The emitting portions are arranged in a plurality in the second direction, the light shielding portions are arranged in a plurality in the second direction by covering the non-emitting surface, in a rotational direction around an axis extending in the normal direction, the inclination angle of the non-emitting surface and the light shielding portion with respect to the first direction is γ, in a cross-section in a direction orthogonal to the first direction, a line segment connecting the viewer and the light guide body is Lb, and in a rotational direction around an axis extending in the first direction, the inclination angle of Lb with respect to the second direction is β. The non-emitting surface and the light shielding portion are [Number] formed to satisfy the relational expression (2). [Claim 4] In a rotational direction around an axis extending in the normal direction, when the inclination angle of the attachment member with respect to the first direction is Γ, the light guide body is formed to satisfy γ≦Γ, the optical member according to Claim 3. [Claim 5] The optical member according to any one of claims 1 to 4, wherein the first direction coincides with the vertical direction, the second direction coincides with the front-rear direction of the viewer, and the normal direction coincides with the left-right direction of the viewer. [Claim 6] An optical member attached to an attachment member (5), comprising: an incident surface (25) on which external scene light (Lo) from a blind spot region is incident; a first reflection surface (31, 311) that reflects light from the incident surface; a second reflection surface (32) that reflects the light reflected by the first reflection surface; an emission part (40) that emits the light from the incident surface and the light reflected by the second reflection surface to the outside; a first rough surface (201) that intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflection surface, and the second reflection surface. The direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflection surface is defined as a first direction (Da1), and the direction orthogonal to the normal direction and the first direction is defined as a second direction (Da2). The emission parts are arranged in a plurality at a predetermined interval in the second direction, and the first reflection surfaces are arranged in a plurality at a predetermined interval in the second direction by being formed between adjacent emission parts. In the rotational direction around an axis extending in the front-rear direction of the viewer, the inclination angle of the first reflection surface with respect to the vertical direction is ωr, and in the rotational direction around an axis extending in the left-right direction of the viewer, the inclination angle of the first reflection surface with respect to the vertical direction is γr. In a cross-section in a direction orthogonal to the vertical direction, a line segment connecting the viewer and the light guide is Lb, and in the rotational direction around an axis extending in the vertical direction, the inclination angle of Lb with respect to the front-rear direction is β. The first reflection surface is

Number

Number

Explanation of Reference Numerals

[0072] 5 Pillar 10 Optical member 20 Light guide 25 Incident surface 31 First reflecting surface 32 Second reflecting surface 40 Prism 201 First rough surface 202 Second rough surface 311 Half mirror

Claims

1. An optical member attached to an attachment member (5), comprising a light guide body (20) having an incident surface (25) to which external scene light (Lo) from a blind spot region is incident, a first reflecting surface (31, 311) that reflects light from the incident surface, a second reflecting surface (32) that reflects the light reflected by the first reflecting surface, an emission part (40) that emits the light from the incident surface and the light reflected by the second reflecting surface to the outside, a first rough surface (201) that intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface, and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface, wherein a direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflecting surface is defined as a first direction (Da1), and a direction orthogonal to the normal direction and the first direction is defined as a second direction (Da2), wherein a plurality of the emission parts are arranged at a predetermined interval in the second direction, wherein the first reflecting surfaces are formed between adjacent ones of the emission parts and are arranged in a plurality with a predetermined interval in the second direction, wherein, in a rotational direction around an axis extending in the normal direction, an inclination angle of the first reflecting surface with respect to the first direction is γr, wherein, in a cross section in a direction orthogonal to the first direction, a line segment connecting a viewer and the light guide body is Lb, and wherein, in a rotational direction around an axis extending in the first direction, an inclination angle of Lb with respect to the second direction is β, wherein the first reflecting surface 【Number 1】 is formed to satisfy the relational expression (1). The optical member.

2. wherein, in a rotational direction around an axis extending in the normal direction, an inclination angle of the attachment member with respect to the first direction is Γ, the light guide body is formed to satisfy γr ≤ Γ. The optical member according to Claim 1.

3. An optical member attached to an attachment member (5), An incident surface (25) on which external scene light (Lo) from a dead angle area is incident, a first reflecting surface (31, 311) that reflects light from the incident surface, a second reflecting surface (32) that reflects the light reflected by the first reflecting surface, an emitting surface (42) that emits the light from the incident surface and the light reflected by the second reflecting surface to the outside, and a non-emitting surface (45) connected to the emitting surface, and an emitting part (40) including the non-emitting surface; a first rough surface (201) that intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface. A light-shielding part (60) that shields light from the outside of the light guide body toward the emitting part by covering the non-emitting surface. Comprising In the direction from the first rough surface toward the second rough surface, a direction orthogonal to the normal direction (Dn) of the first reflecting surface is defined as a first direction (Da1). When a second direction (Da2) is a direction orthogonal to the normal direction and the first direction. A plurality of the emitting parts are arranged in the second direction. The light-shielding part is arranged in a plurality in the second direction by covering the non-emitting surface. In the rotational direction around the axis extending in the normal direction, the inclination angle of the non-emitting surface and the light-shielding part with respect to the first direction is γ. In a cross-section in a direction orthogonal to the first direction, a line segment connecting the viewer and the light guide body is defined as Lb. In the rotational direction around the axis extending in the first direction, the inclination angle of Lb with respect to the second direction is β. The non-emitting surface and the light-shielding part 【Number 2】 An optical member formed to satisfy the relational expression (2).

4. In the rotational direction around the axis extending in the normal direction, when the inclination angle of the mounting member with respect to the first direction is Γ. The light guide body is the optical member according to claim 3, formed to satisfy γ ≤ Γ.

5. The first direction coincides with the vertical direction. The second direction coincides with the front-rear direction of the viewer. The optical member according to any one of claims 1 to 4, wherein the normal direction coincides with the left-right direction of the viewer.

6. An optical member attached to a mounting member (5). An incident surface (25) on which external light (Lo) from a dead angle area is incident, a first reflecting surface (31, 311) that reflects light from the incident surface, a second reflecting surface (32) that reflects the light reflected by the first reflecting surface, an emitting portion (40) that emits the light from the incident surface and the light reflected by the second reflecting surface to the outside, a first rough surface (201) that intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface, and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface, and a light guide (20) having the same. A direction from the first rough surface toward the second rough surface and orthogonal to the normal direction (Dn) of the first reflecting surface is defined as a first direction (Da1). When a direction orthogonal to the normal direction and the first direction is defined as a second direction (Da2), The emitting portions are arranged in a plurality at a predetermined interval in the second direction. The first reflecting surface is formed between adjacent ones of the emitting portions and is arranged in a plurality at a predetermined interval in the second direction. In a rotational direction around an axis extending in the front-rear direction of the viewer, an inclination angle of the first reflecting surface with respect to the vertical direction is ωr. In a rotational direction around an axis extending in the left-right direction of the viewer, an inclination angle of the first reflecting surface with respect to the vertical direction is γr. In a cross section in a direction orthogonal to the vertical direction, a line segment connecting the viewer and the light guide is defined as Lb. In a rotational direction around an axis extending in the vertical direction, when an inclination angle of Lb with respect to the front-rear direction is β, The first reflecting surface is 【Number 3】 An optical member formed to satisfy the relational expressions (3-1) to (3-3).

7. In a rotational direction around an axis extending in the left-right direction, when an inclination angle of the mounting member with respect to the vertical direction is Γ, The light guide is the optical member according to claim 6, formed to satisfy γr ≦ Γ.

8. An optical member attached to a mounting member (5), An incident surface (25) on which external light (Lo) from a dead angle area is incident, a first reflecting surface (31, 311) that reflects light from the incident surface, a second reflecting surface (32) that reflects the light reflected by the first reflecting surface, an emitting surface (42) that emits the light from the incident surface and the light reflected by the second reflecting surface to the outside, and a non-emitting surface (45) connected to the emitting surface, including an emitting portion (40); a first rough surface (201) that intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface; and a second rough surface (202) that is disposed on the side opposite to the first rough surface and intersects and is connected to the incident surface, the first reflecting surface, and the second reflecting surface. A light-shielding portion (60) that shields light from outside the light guide body toward the emitting portion by covering the non-emitting surface. Comprising In the direction from the first rough surface toward the second rough surface, a direction orthogonal to the normal direction (Dn) of the first reflecting surface is defined as a first direction (Da1). When a second direction (Da2) is a direction orthogonal to the normal direction and the first direction. The emitting portions are arranged in a plurality in the second direction. The light-shielding portions are arranged in a plurality in the second direction by covering the non-emitting surface. In the rotational direction around an axis extending in the front-rear direction of the viewer, the inclination angle of the non-emitting surface and the light-shielding portion with respect to the vertical direction is ω. In the rotational direction around an axis extending in the left-right direction of the viewer, the inclination angle of the non-emitting surface and the light-shielding portion with respect to the vertical direction is γ. In a cross-section in a direction orthogonal to the vertical direction, a line segment connecting the viewer and the light guide body is defined as Lb. In the rotational direction around an axis extending in the vertical direction, when the inclination angle of Lb with respect to the front-rear direction is β. The non-emitting surface and the light-shielding portion [Number 4] An optical member formed to satisfy the relational expressions (4-1) to (4-3).

9. In the rotational direction around an axis extending in the left-right direction, when the inclination angle of the mounting member with respect to the vertical direction is Γ. The light guide body is the optical member according to claim 8, formed to satisfy γ≤Γ.

10. The first rough surface and the second rough surface are the optical member according to any one of claims 6 to 9, orthogonal to the vertical direction.

11. The second direction is the optical member according to claim 6 or 8, which coincides with the front-rear direction.

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