JP6259627B2 - Light beacon - Google Patents

Description

  The present invention relates to an optical beacon, and more particularly to an optical beacon for performing optical communication with a vehicle.

  In recent years, traffic information services using the above-described optical beacons have become widespread. The optical beacon is installed on the road R and includes a plurality of light emitting diodes (hereinafter abbreviated as LEDs) arranged side by side on a substrate for optical communication with a vehicle. When the vehicle enters the LED irradiation range, the optical beacon can perform optical communication with the vehicle and transmit traffic information and the like to the vehicle.

  The above-described LED is usually provided integrally with a lens for condensing a light beam emitted from the LED, and irradiation light emitted from the LED has a certain degree of directivity. For this reason, there existed a problem that the irradiation range of LED was narrow.

  Conventionally, in order to solve this problem, lead terminals for connecting the substrates of some LEDs are bent, and the irradiation direction of the LEDs is changed to widen the irradiation range. However, the bending of the lead terminals can only be performed manually, and it is difficult to perform with high accuracy. For this reason, there has been a risk that the quality of each product may vary.

  Accordingly, an optical beacon provided with an optical component that changes the direction of the irradiation light of the LED has been proposed (Patent Document 1). In this optical component, a rectangular flat plate portion is provided at the center, and a prism portion is provided so as to surround the flat plate portion. Since this prism portion has a uniform inclined surface along the periphery of the flat plate portion, there is a problem that it is difficult to provide the LED to irradiate a desired range.

JP 2013-30112 A

  Then, this invention makes it a subject to provide the optical beacon which can irradiate a light emitting diode to a desired range easily.

The invention according to claim 1 for solving the above-described problem includes: a plurality of light emitting diodes arranged side by side on a substrate for optical communication with a vehicle; and an optical member that changes an irradiation direction of the light emitting diodes. In the optical beacon provided, the optical member includes a flat plate portion covering the light emitting diode, and a plurality of prisms protruding from the flat plate portion and provided with inclined surfaces, and each of the plurality of prisms is The substrate and the flat plate portion are disposed obliquely with respect to the vertical direction, and the inclined direction of the flat plate portion and the horizontal direction of the flat plate portion are provided. The inclined surface of the prism, which is provided so that the inclined surface of the prism is inclined obliquely with respect to the direction, and is disposed on one end side with respect to the horizontal center of the flat plate portion is the flat plate portion. The inclined surface of the prism, which is provided so as to protrude as it approaches one end and is disposed on the other end side from the horizontal center of the flat plate portion, is provided so as to protrude as it approaches the other end of the flat plate portion. It consists in the optical beacon, characterized in that there.

According to a second aspect of the invention, a plurality of prisms are arranged in the inclination direction of the substrate and the flat plate portion, according to claim 1, characterized in that the inclined surface is provided in parallel to each other The light beacon.

According to a third aspect of the present invention , there is provided an optical beacon comprising: a plurality of light emitting diodes arranged side by side on a substrate for optical communication with a vehicle; and an optical member that changes an irradiation direction of the light emitting diodes. The member includes a flat plate portion covering the light emitting diode, and a plurality of prisms protruding from the flat plate portion and provided with inclined surfaces, and each of the plurality of prisms is at least a part of the light emitting diode. provided in a position opposed every single on, the optical member, there is provided a light beacon you characterized by having an opening exposing a portion of the light emitting diode.

Invention of claim 4, light-emitting diodes facing the opening, the light beacon according to claim 3, wherein the wide irradiation angle than the light emitting diodes facing the each one of the plurality of prisms Exist.

  As described above, according to the first aspect of the present invention, each of the plurality of prisms is provided at a position facing at least one of the light emitting diodes. Thereby, since the irradiation direction of each light emitting diode can be adjusted by the prism, the light emitting diode can be easily irradiated to a desired range.

According to the first aspect of the present invention, the inclined surface of the prism is provided so as to protrude along the inclined direction with respect to the inclined direction and the horizontal direction of the flat plate portion. The range can be expanded in both the tilt direction and the horizontal direction of the substrate and the flat plate portion.

According to the first aspect of the present invention, the prism disposed at one end side of the horizontal center of the flat plate portion changes the light of the light emitting diode to go to one end in the horizontal direction, and from the horizontal center of the flat plate portion. Since the prism arranged on the other end side changes the light of the light emitting diode so as to go to the other end in the horizontal direction, the irradiation range of the light emitting diode can be efficiently expanded in the horizontal direction of the substrate and the flat plate portion. Can do.

According to the second aspect of the present invention, the plurality of prisms arranged side by side in the inclined direction of the substrate and the flat plate portion are provided with the inclined surfaces in parallel with each other. The irradiation range can be expanded in the horizontal direction of the substrate and the flat plate portion.

According to the invention of claim 3 , since the optical member has an opening that exposes a part of the light emitting diode, without changing the irradiation direction of light from the exposed light emitting diode, and without being attenuated, The light can be emitted from the opening. Moreover, the heat dissipation effect increases by providing the opening.

According to the fourth aspect of the present invention, the light emitting diode facing the opening has a wider irradiation angle than the light emitting diode facing each of the plurality of prisms. Thereby, the light emitting diode facing the opening whose irradiation direction is not changed has a wide irradiation angle and irradiates the whole. Further, the irradiation angle of the light emitting diode facing each of the plurality of prisms is narrowed so that the irradiation direction can be changed to the direction aimed by the prism.

It is a schematic side view which shows one Embodiment of the optical beacon of this invention installed on the road. It is a perspective view of the optical beacon shown in FIG. It is sectional drawing of the optical beacon shown in FIG. It is a perspective view of the prism board which comprises the optical beacon shown in FIG. FIGS. 5A and 5B are a rear view and a left side view of the prism plate shown in FIG. 4, respectively. FIGS. 5A to 5D are a front view, a right side view, a bottom view, and a plan view of the prism plate shown in FIG. (A)-(E) are the AA, BB, CC, DD, and EE line sectional views of Drawing 5 (A), respectively. (A) And (B) is a figure for demonstrating the advancing direction of the light which passes the opening part of a prism plate, and a prism.

  The optical beacon of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic side view showing an embodiment of an optical beacon 1 of the present invention installed on a road R. As shown in FIG. FIG. 2 is a perspective view of the optical beacon 1 shown in FIG. FIG. 3 is a cross-sectional view of the optical beacon 1 shown in FIG. In FIG. 2, the cover 112 is omitted.

  As shown in FIG. 1, the optical beacon 1 of this embodiment performs optical communication with an in-vehicle device S mounted on a vehicle C traveling on a road R. As shown in FIGS. 2 and 3, the optical beacon 1 includes an accommodation case 11, a substrate 12 accommodated in the accommodation case 11, a support base 13, a light emitting diode (hereinafter referred to as LED) 14, and a prism plate 15 as an optical member. And.

  The housing case 11 includes a tray-shaped case body 111 and a cover 112 that covers the opening of the case body 111. As shown in FIG. 1, the storage case 11 is fixed to a construction bar B which is horizontally installed so as to cross the road R from a column or the like standing on the side of the road R, and directly above the lane of the road R. Has been placed. At this time, it is fixed to the construction bar B so that the case main body 111 is on the upper side and the cover 112 is on the lower side. The cover 112 is provided with an opening through which light from the LED 14 described later passes.

  The substrate 12 is provided in a rectangular shape. The support base 13 is for supporting the substrate 12 so as to be disposed obliquely with respect to the vertical direction, and is fixed to the case main body 111. The support 13 includes a pair of side walls 131, a pair of inclined walls 132 (FIG. 2), and a connecting wall 133 that connects the pair of side walls 131. The pair of side walls 131 are provided in parallel to each other and are spaced apart in the vehicle width direction. The ends of the pair of side walls 131 on the lower side in the vertical direction (hereinafter referred to as road R side) and the rear side in the vehicle traveling direction Yc are cut obliquely.

  The pair of inclined walls 132 are provided so as to stand inward from the diagonally cut ends of the pair of side walls 131. The substrate 12 is screwed to the pair of inclined walls 132. Thereby, the board | substrate 12 is inclined and arrange | positioned diagonally with respect to the perpendicular direction so that it may approach the road R as it goes to the vehicle advancing direction Yc front side, as shown in FIG. The connecting wall 133 connects the ends of the pair of side walls 131 on the front side in the vehicle traveling direction Yc and on the road R side. The connection wall 133 is provided substantially horizontally, and another substrate (not shown) is mounted thereon.

  A plurality of LEDs 14 are arranged side by side on the substrate 12. A plurality of LEDs 14 are arranged in a matrix, each in the tilt direction Y11 of the substrate 12 and in the horizontal direction Y12 orthogonal to the tilt direction Y11. In the present embodiment, as the LED 14, two types of a condensing LED and a wide-angle LED having a wider irradiation angle than the condensing LED are mounted on the substrate 12. Details of the condensing LED and the wide-angle LED will be described later. The light emitted from the LED 14 can transmit an optical signal to the vehicle-mounted device S mounted on the vehicle C.

  The prism plate 15 is an optical member that changes the irradiation direction of the LED 14, and is composed of a plate-like transparent member formed using an acrylic resin or the like. The prism plate 15 will be described with reference to FIGS. FIG. 4 is a perspective view of the prism plate 15 constituting the optical beacon 1 shown in FIG. 5A and 5B are a rear view and a left side view of the prism plate 15 shown in FIG. 4, respectively. 6A to 6D are respectively a front view, a right side view, a bottom view, and a plan view of the prism plate 15 shown in FIG. FIG. 7 is a cross-sectional view taken along lines AA, BB, CC, DD, and EE in FIG. 5A, respectively.

  As shown in the figure, the prism plate 15 is provided with a flat plate portion 151 covering the LED 14, mounting legs 152 protruding from the four corners of the flat plate portion 151, and protruding from the flat plate portion 151 toward the LED 14, and an inclined surface T is provided. A plurality of prisms 153.

  The flat plate portion 151 is provided in a rectangular shape in plan view, and an opening 151A for exposing the LED 14 is provided. The opening 151A is provided in a long shape in the horizontal direction Y12. The light from the LED 14 facing the opening 151A is irradiated toward the road R without changing the irradiation direction by the prism plate 15.

  The mounting legs 152 protrude from the four corners of the flat plate portion 151 toward the substrate 12 and are screwed to the substrate 12. Thereby, the prism plate 15 is fixed to the substrate 12. When the prism plate 15 is fixed to the substrate 12 in this way, the flat plate portion 151 is arranged in a tendency to be spaced from the substrate 12, and similarly to the substrate 12, it is arranged obliquely with respect to the vertical direction.

  The prism 153 includes a plurality of individual prisms 153A to 153H and a plurality of line prisms 153I.

  Each of the plurality of individual prisms 153 </ b> A to 153 </ b> H is provided at a position facing each of the LEDs 14. In addition, the inclined surfaces T of the plurality of individual prisms 153A to 153H protrude along an inclined direction (hereinafter referred to as prism inclination directions Y2a to Y2h) with respect to the inclination direction Y11 and the horizontal direction Y12 of the flat plate portion 151. It is provided as follows.

  More specifically, as shown in FIG. 5A and the like, the individual prisms 153A to 153D are provided above the opening 151A in the inclination direction Y11, and provided with an inclined surface T that protrudes toward the upper side of the inclination direction Y11. Yes. The individual prisms 153A and 153B are arranged on one end side with respect to the center in the horizontal direction Y12, and the individual prisms 153C and 153D are arranged on the other end side with respect to the center in the horizontal direction Y12.

  A plurality of the individual prisms 153A and 153B are arranged along the tilt direction Y11, and the rows of the individual prisms 153A and the rows of the individual prisms 153B are alternately arranged along the horizontal direction Y12. In the present embodiment, from one end of the horizontal direction Y12 toward the center, a row of five individual prisms 153A, a row of five individual prisms 153B, a row of five individual prisms 153A, and a row of five individual prisms 153B. The four individual prisms 153A are arranged in this order.

  Similarly, the individual prisms 153C and the individual prisms 153D are arranged side by side along the tilt direction Y11, and the rows of the individual prisms 153C and the rows of the individual prisms 153D are alternately arranged along the horizontal direction Y12. In the present embodiment, from the other end in the horizontal direction Y12 toward the center, a row of five individual prisms 153C, a row of five individual prisms 153D, a row of five individual prisms 153C, and five individual prisms 153D. And four individual prisms 153C are arranged in this order.

  The inclined surfaces T of the individual prisms 153A and 153B arranged on one end side (the upper side in the drawing) of the flat plate portion 151 in the horizontal direction Y12 are provided so as to protrude toward the one end of the flat plate portion 151. The prism tilt direction Y2a of the individual prism 153A is different from the prism tilt direction Y2b of the individual prism 153B. In the present embodiment, the prism tilt direction Y2a has a smaller tilt with respect to the tilt direction Y11 than the prism tilt direction Y2b.

  The inclined surfaces T of the individual prisms 153C and 153D arranged on the other end side (lower side in the drawing) of the flat plate portion 151 in the horizontal direction Y12 are provided so as to protrude toward the other end side of the flat plate portion 151. Yes. Also, the prism tilt direction Y2c of the individual prism 153C is different from the prism tilt direction Y2d of the individual prism 153D. In the present embodiment, the prism tilt direction Y2c has a smaller tilt with respect to the tilt direction Y11 than the prism tilt direction Y2d.

  Each of the plurality of individual prisms 153A is provided with the inclined surfaces T in parallel with each other. Each of the plurality of individual prisms 153B is also provided with inclined surfaces T parallel to each other. Each of the plurality of individual prisms 153C is also provided with inclined surfaces T parallel to each other. The plurality of individual prisms 153D are also provided with inclined surfaces T in parallel with each other.

  The individual prisms 153E to 153H are provided below the opening 151A in the inclination direction Y11. The individual prisms 153E and 153G are provided with an inclined surface T that protrudes toward the lower side of the inclination direction Y11, and the individual prisms 153F, 151H, and 151I are provided with an inclined surface T that protrudes toward the upper side of the inclination direction Y11. . The individual prisms 153E and 153F are arranged on one end side (upper side in the drawing) from the center in the horizontal direction Y12, and the individual prisms 153G and 153H are arranged on the other end side (lower side in the drawing) from the center in the horizontal direction Y12. Yes.

  A plurality of the individual prisms 153E and 153F are arranged along the tilt direction Y11, and the rows of the individual prisms 153E and the rows of the individual prisms 153F are alternately arranged along the horizontal direction Y12. In the present embodiment, a row of two individual prisms 153E, a row of two individual prisms 153F, and a row of two individual prisms 153E are arranged in this order from one end in the horizontal direction Y12 toward the center.

  A plurality of the individual prisms 153G and 153H are arranged along the tilt direction Y11, and the rows of the individual prisms 153G and the rows of the individual prisms 153H are alternately arranged along the horizontal direction Y12. In the present embodiment, a row of two individual prisms 153G, a row of two individual prisms 153H, and a row of two individual prisms 153G are arranged in this order from one end in the horizontal direction Y12 toward the center.

  The inclined surfaces T of the individual prisms 153E and 153F arranged on one end side (the upper side in the drawing) of the flat plate portion 151 in the horizontal direction Y12 are provided so as to protrude toward one end of the flat plate portion 151. The inclined surfaces T of the individual prisms 153G and 153H arranged on the other end side from the center in the horizontal direction Y12 of the flat plate portion 151 are provided so as to protrude toward the other end side of the flat plate portion 151.

  The line prism 153I is provided below the opening 151A in the tilt direction Y11, and is disposed between the individual prisms 153E and 153F and the individual prisms 153G and 153H. The line-shaped prism 153I is provided in a long shape along the horizontal direction Y12, and faces the four LEDs 14. Further, the inclined surface T of the line prism 153I is provided so as to protrude toward the upper side of the inclination direction Y11, and the horizontal direction Y12 is provided at the same height.

  Next, returning to the LED 14, a wide-angle LED is used as the LED 14 facing the opening 151 </ b> A of the prism plate 15 and the linear prism 153 </ b> I described above. On the other hand, a condensing LED is used as the LED 14 facing the individual prisms 153A to 15H.

  Next, the irradiation range of the optical beacon 1 having the above-described configuration will be described. As shown in FIG. 8A, the light LL emitted from the LED 14 facing the opening 151A is emitted as it is without changing the irradiation direction. On the other hand, as shown in FIG. 8B, the light LL passing through the prism 153 described above out of the light LL emitted from the LED 14 is refracted and emitted on the inclined surface T of the prism 153 to the upper side of the prism inclination direction Y2. The

  More specifically, the light LL emitted from the LED 14 facing the individual prisms 153A and 153B is refracted toward the upper side of the tilt direction Y11 and one end of the horizontal direction Y12 on the tilted surface T of the individual prisms 153A and 153B. In addition, the light LL emitted from the LED 14 facing the individual prisms 153C and 153D is refracted toward the upper side in the tilt direction Y11 and the other end side in the horizontal direction Y12 on the inclined surface T of the individual prisms 153C and 153D. That is, the individual prisms 153A to 153D can expand the irradiation range of the LED 14 in the vehicle traveling direction Yc rear side and the vehicle width direction.

  The light LL emitted from the LED 14 facing the individual prism 153E is refracted toward the lower side of the tilt direction Y11 and one end side of the horizontal direction Y12 on the tilted surface T of the individual prism 153E. In addition, the light LL emitted from the LED 14 facing the individual prism 153G is refracted to the lower side of the tilt direction Y11 and the other end of the horizontal direction Y12 on the tilted surface T of the individual prism 153F. That is, the individual prisms 153E and 153G can expand the irradiation range of the LED 14 in the vehicle traveling direction Yc front side and the vehicle width direction.

  Further, the light LL emitted from the LED 14 facing the individual prism 153F is refracted by the inclined surface T of the individual prism 153F toward the upper side in the tilt direction Y11 and one end side in the horizontal direction Y12. The light LL emitted from the LED 14 facing the individual prism 153H is refracted by the inclined surface T of the individual prism 153H toward the upper side in the tilt direction Y11 and the other end side in the horizontal direction Y12. That is, the individual prisms 153F and 153H can direct the light from the LED 14 toward the irradiation range of the LED 14 facing the opening 151A, increase the luminous intensity of the range, and expand the irradiation range of the LED 14 in the vehicle width direction.

  In addition, the light LL emitted from the LED 14 facing the line prism 153I is refracted toward the upper side in the tilt direction Y11 by the tilt surface T of the line prism 153I. That is, the line-shaped prism 153I can direct the light from the LED 14 to the irradiation range of the LED 14 facing the opening 151A, and can increase the luminous intensity of the range.

  According to the above-described embodiment, each of the plurality of individual prisms 153 </ b> A to 153 </ b> H is provided so as to face each of some of the LEDs 14. Thereby, since the irradiation direction of each LED 14 can be adjusted by the individual prisms 153A to 153H, the LED 14 can be easily irradiated to a desired range.

  Further, according to the embodiment described above, the inclined surfaces T of the individual prisms 153A to 153H are provided so as to protrude along a direction inclined obliquely with respect to the inclination direction Y11 on the flat plate portion 151. The irradiation range of the LED 14 can be expanded in the horizontal direction Y12 (= the vehicle width direction of the road R).

  Further, according to the above-described embodiment, the inclined surface T of the individual prisms 153A, 153B, 153E, and 153F arranged on one end side with respect to the center in the horizontal direction Y12 of the flat plate portion 151 protrudes as it approaches one end of the flat plate portion 151. The inclined surfaces T of the individual prisms 153C, 153D, 153G, and 153H disposed on the other end side with respect to the center in the horizontal direction Y12 of the flat plate portion 151 are projected so as to approach the other end of the flat plate portion 151. Is provided. As a result, the individual prisms 153A, 153B, 153E, and 153F change the light LL of the LED 14 toward one end in the horizontal direction Y12, and the individual prisms 153C, 153D, 153G, and 153H change the light LL of the LED 14 in the horizontal direction Y12. Thus, the irradiation range of the LED 14 can be efficiently expanded in the horizontal direction Y12.

  Further, according to the above-described embodiment, the individual prisms 153A to 153H provided side by side in the inclination direction Y11 are provided with the inclined surfaces T in parallel with each other. The range can be expanded in the horizontal direction Y12.

  In addition, according to the above-described embodiment, the prism plate 15 has the opening 151A that exposes a part of the LED 14, so that the irradiation direction of the light from the exposed LED 14 is not changed and is not attenuated. The light can be emitted from the opening 151A. In addition, the heat dissipation effect is enhanced by providing the opening 151A.

In order to confirm this heat dissipation effect, the present inventor considered the optical beacon 1 with the opening 151A, the opening 151A as the optical beacon 1 with 2/3 of the product A of the invention A, and the optical beacon 1 without the opening 151A with respect to the outside air ( The temperature around the central LED 14 was measured at 50 degrees around the optical beacon 1. The results are shown below.
With opening 151A: 81.2 degrees Opening 151A2 / 3: 82.2 degrees Without opening 151A: 82.8 degrees

  As is clear from the above results, it was found that the provision of the opening 151A enhances the heat dissipation effect, which is about 2 degrees lower than that without the opening 151A.

  In the above-described embodiment, the wide-angle LED used as the LED 14 facing the opening 151A has a wider irradiation angle than the condensing LED used as the LED 14 facing each of the individual prisms 153A to 153H. Thereby, the LED 14 facing the opening 151A whose irradiation direction is not changed has a wide irradiation angle and irradiates the whole. Further, the irradiation angle of the LED 14 facing each of the plurality of individual prisms 153A to 153H is narrowed so that the irradiation direction can be changed to the target direction by the individual prisms 153A to 153H.

  In the above-described embodiment, the opening 151A is provided in the flat plate portion 151. However, the present invention is not limited to this. The opening 151A may not be provided.

  Further, according to the embodiment described above, the inclined surfaces T of the plurality of individual prisms 153A arranged in the inclination direction Y11 are parallel to each other. Similarly, the plurality of individual prisms 153B to 153H arranged in the tilt direction Y11 are parallel to each other, but the present invention is not limited to this. The plurality of individual prisms 153A arranged in the inclination direction Y11 may have different inclination angles of the inclined surfaces T and prism inclination directions Y2a. Similarly, the plurality of individual prisms 153B to 153H arranged in the inclination direction Y11 may have different inclination angles of the inclined surfaces T and prism inclination directions Y2b to Y2h.

  Further, according to the above-described embodiment, the inclined surface T of the individual prisms 153A, 153B, 153E, and 153F arranged on one end side with respect to the center in the horizontal direction Y12 of the flat plate portion 151 protrudes as it approaches one end of the flat plate portion 151. The inclined surfaces T of the individual prisms 153C, 153D, 153G, and 153H disposed on the other end side with respect to the center in the horizontal direction Y12 of the flat plate portion 151 are projected so as to approach the other end of the flat plate portion 151. However, it is not limited to this. The inclined surface T of each individual prism 153A-153H should just be provided so that it may become a desired irradiation range.

  Further, according to the above-described embodiment, each prism 153 protrudes from the flat plate portion 151 toward the LED 14, but is not limited thereto. You may provide the prism 153 so that it may protrude toward the reverse side (road R side) with LED14.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Optical beacon 12 Substrate 14 Light emitting diode (LED)
15 Prism plate (optical member)
151 Flat plate portion 151A Opening 153A to 153H Individual prism (prism)
T Inclined surface Y11 Inclined direction

Claims (4)

In an optical beacon comprising a plurality of light emitting diodes arranged side by side on a substrate for performing optical communication with a vehicle, and an optical member that changes the irradiation direction of the light emitting diodes,
The optical member has a flat plate portion covering the light emitting diode, and a plurality of prisms protruding from the flat plate portion and provided with inclined surfaces,
Each of the plurality of prisms is provided at a position facing at least one of the light emitting diodes.
The substrate and the flat plate portion are disposed obliquely with respect to the vertical direction,
The inclined surface of the prism is provided along the inclined direction with respect to the inclined direction and the horizontal direction of the flat plate part,
The inclined surface of the prism disposed on one end side from the horizontal center of the flat plate portion is provided so as to protrude as approaching one end of the flat plate portion,
The optical beacon , wherein the inclined surface of the prism disposed on the other end side from the horizontal center of the flat plate portion is provided so as to protrude toward the other end of the flat plate portion . A plurality of prisms are arranged in the inclination direction of the substrate and the flat plate portion, a light beacon according to claim 1, characterized in that the inclined surface is provided in parallel to each other. In an optical beacon comprising a plurality of light emitting diodes arranged side by side on a substrate for performing optical communication with a vehicle, and an optical member that changes the irradiation direction of the light emitting diodes,
The optical member has a flat plate portion covering the light emitting diode, and a plurality of prisms protruding from the flat plate portion and provided with inclined surfaces,
Each of the plurality of prisms is provided at a position facing at least one of the light emitting diodes.
The optical member, optical beacon you characterized by having an opening exposing a portion of the light emitting diode. 4. The optical beacon according to claim 3 , wherein the light emitting diode facing the opening has a wider irradiation angle than the light emitting diode facing each of the plurality of prisms.

Images