JP7008535B2 - Light receiving device and vehicle detector - Google Patents

Description

The present invention relates to a light receiving device and a vehicle detector.

In the electronic toll collection system installed at the entrances and exits of expressways, it is necessary to individually recognize and process each vehicle. Therefore, a vehicle detector is used as a device for detecting the entry and exit of a vehicle (see, for example, Patent Document 1).

In Patent Document 1, a light emitting device arranged on one side in the width direction of a lane and having a plurality of light emitting devices (light emitting elements) and a plurality of light receiving devices arranged on the other side in the width direction of the lane so as to face the light emitting device. A vehicle detector equipped with a light receiving device (light receiving element) is disclosed.
In a vehicle detector having such a configuration, the light emitted from the light emitter toward the receiver is obstructed by the vehicle, and when the signal level of the receiver drops below a predetermined value, the passage of the vehicle is detected. ..

The light receiving device includes, for example, a plurality of light receiving elements arranged so as to face the light emitting device side, and a light emitting unit provided on the same surface as the plurality of light receiving elements and emitting light when the plurality of light receiving elements receive light. And, some have a light receiving device main body integrally formed.
By having such a light emitting unit, for example, in the installation of a vehicle detector, the mounting operator can adjust the mounting position and posture while checking the light emitting state of the light emitting unit, and can easily receive light. The device can be installed.

Japanese Patent No. 3700418

By the way, in the vehicle detector provided with the light receiving device main body, after fixing the light emitting device to the island arranged on one side in the width direction of the lane, the optical axis of the light receiving device arranged on the island on the other side in the width direction of the lane. After making the adjustment, fix the light receiving device.
However, in the light receiving device having the above configuration, since the light emitting unit is provided on the light emitting device side (front side of the light receiving device), the installation operator can visually check the light emitting unit at the time of adjusting the optical axis. Your body may block the optical axis. As a result, it may take a lot of time to adjust the optical axis.

Therefore, the present invention is a light receiving device capable of confirming the state of the display unit from the width direction of the lane and a direction different from the width direction of the lane, and shortening the time required for adjusting the optical axis. And to provide vehicle detectors.

In order to solve the above problems, according to the light receiving device (12, 55, 60, 70, 80) according to the first aspect of the present invention, the light emitted from one side in the width direction of the lane (L) is received. A light receiving device including a light receiving device main body (33), wherein the light receiving device main body faces one side in the width direction of the lane and receives the light, and the light receiving element (52) and the light of the light receiving element. A second direction (D2, D2) that includes a display unit (35) that emits light according to the detection state and is different from the first direction (D1, D4) that directs the light from the display unit to one side in the width direction of the lane. The display unit (35) includes a light emitting unit (41, 56, 61, 71, 83) that irradiates D3, D5), and all the light receiving elements (52) receive the irradiated light. It emits light only when .

According to the present invention, the mounting operator adjusts the optical axis by providing a light emitting unit that irradiates light from the display unit in a second direction different from the first direction toward one side in the width direction of the lane. At that time, since the optical axis (G) is not cut off, the time required for adjusting the optical axis can be shortened.

According to the second aspect of the present invention, in the light receiving device according to the first aspect, the display unit is arranged on one side in the width direction of the lane of the light receiving device main body, and the light emitting unit is the light emitting unit. It may have an optical guide member (39, 58, 63, 73) that guides a part of the light from the display unit in the second direction and guides the rest of the light in the first direction. ..

In this way, by having the optical guide member that guides a part of the light from the display unit in the second direction and guides the rest of the light in the first direction, the light from the display unit is first. And it becomes possible to irradiate in the second direction. This makes it possible to check the state of the display unit from two directions.

According to the third aspect of the present invention, in the light receiving device according to the second aspect, the side plate (42B) having an outer surface (42b) facing the side opposite to the light receiving device main body in the length direction of the lane. The side plate is provided with an opening (42Ba, 42Bb) in which the other end of the optical guide member, which is located on the opposite side of the one end to which the light from the display portion is irradiated, is arranged. , 42Bc) may be formed and the other end thereof may be exposed from the outer surface.

In this way, an opening in which the other end of the optical guide member is arranged is formed in the side plate having an outer surface facing the length direction of the lane, and the end surface of the other end is exposed from the outer surface of the side plate. Then, it is possible to check the state of the display unit from the length direction of the lane. Further, since the opening is provided, the mounting position of the optical guide member becomes clear and the mounting work can be easily performed.
As a result, when adjusting the optical axis, the mounting operator does not shut off the optical axis, so that the time required for adjusting the optical axis can be shortened.

According to the fourth aspect of the present invention, in the light receiving device according to the third aspect, the optical guide member (39) is a transparent member extending in one direction, and the transparent member is in the first direction. A part of the light is guided to the end surface (39d) of the transparent member exposed from the opening, and the end surface facing the display portion is directed to one end in the width direction of the lane. It may have an inclined surface (39c) that allows the rest of the light to pass through.

As described above, by using the transparent member having an inclined surface as the optical guide member, the state of the display unit can be confirmed from the first and second directions.

According to the fifth aspect of the present invention, in the light receiving device according to the second or third aspect, one end surface (73a) of the optical guide member (73) faces a part of the display unit, and the other The end face (73b) may be an optical fiber (75) arranged in the opening (42Bc).

In this way, by using an optical fiber in which one end surface faces a part of the display unit and the other end surface is arranged in the opening portion as the optical guide member, the state of the display unit can be confirmed from the first and second directions. can do.

According to the sixth aspect of the present invention, in the light receiving device according to the first aspect, the display unit is arranged on the same side as the light receiving element, and the display unit for the first direction faces the first direction. (84) and the second direction display, which emits light according to the light detection state of the light receiving element and emits light so that the light faces the second direction, as in the case of the first direction display unit. It may have a part (85) and.

As described above, by having the first directional light emitting unit and the second directional display unit having the above configuration, it is possible to confirm the light detection state of the light receiving element from two directions.

According to the vehicle detector (1) according to the seventh aspect of the present invention, the light receiving device according to any one of the first to sixth aspects is provided on one side in the width direction of the lane. , A light emitting device (11) having a light emitting element (28) facing the light receiving element and irradiating light may be provided.

According to the vehicle detector having such a configuration, the state of the display unit can be confirmed from the first direction (the width direction of the lane) and the direction different from the first direction, and the light emitting device and the light emitting device. The time required for adjusting the optical axis with the light receiving device can be shortened.

According to the present invention, the time required for adjusting the optical axis can be shortened by checking the state of the display unit from a direction different from the width direction of the lane.

It is a perspective view which shows schematic structure of the vehicle detector which concerns on 1st Embodiment of this invention. It is a figure which looked at the vehicle detector shown in FIG. 1 from the traveling direction side of a vehicle. It is a figure which looked at the light emitting device shown in FIG. 2 from the front side (light receiving device side). It is a figure which looked at the light receiving device shown in FIG. 2 from the front side (light emitting device side). It is sectional drawing in the _B1-2 line direction of the light receiving device shown in _FIG . It is a figure which looked at the upper part of the light receiving device shown in FIG. 4 from the side view from the C direction. It is a perspective view of an optical guide member. It is a front view of the upper part of the light receiving device which concerns on 1st modification of 1st Embodiment of this invention. FIG. 8 is a side view of the light receiving device shown in FIG. 8 from the E direction. It is an enlarged view of the optical guide member shown in FIG. It is sectional drawing of the light receiving apparatus which concerns on 2nd modification of 1st Embodiment of this invention. It is sectional drawing of the light receiving apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing of the light receiving apparatus which concerns on 3rd Embodiment of this invention.

Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the drawings.

<First Embodiment>
[Overall configuration of vehicle detector]
With reference to FIG. 1, the overall configuration of the vehicle detector 1 of the first embodiment will be described.
In FIG. 1, the ± Y direction is the width direction of the lane L, the ± X direction is the length direction of the lane L, the ± Z direction is the vertical direction orthogonal to the ± X direction and the ± Y direction, and the arrow indicates the traveling of the vehicle A. Each direction is shown.
In FIG. 1, as an example, an island IL extending in the ± X direction is arranged on one side (−Y direction) of the lane L in the vehicle width direction, and extends in the ± X direction on the other side (+ Y direction) of the lane L in the vehicle width direction. The following description will be given by taking as an example the case where the island IR is arranged.

The vehicle detector 1 constitutes a toll collection system together with a toll collection machine and the like.
The vehicle detector 1 is a device for detecting the passage of the vehicle A, and includes a light emitting device 11 and a light receiving device 12. The light emitting device 11 is installed on the island IL so that the front surface faces the other side in the lane width direction. The light receiving device 12 is installed on the island IR so that the front surface faces the front surface of the light emitting device 11.

When the vehicle detector 1 is installed on the island IL and IR, the light emitting device 11 is first installed on the island IL, and then the light receiving device 12 is placed on the island IR while adjusting the optical axis with the light emitting device 11. Install in. The upper surfaces of the islands IR and IL are arranged at a position higher than the upper surface of the lane L.

[Light emitting device]
The light emitting device 11 will be described with reference to FIGS. 1 to 3. In FIG. 2, for convenience of explanation, the housings 15 and 31 and the optical guide member 39 are shown in cross section. In FIG. 2, G indicates an optical axis (hereinafter referred to as “optical axis G”). In FIGS. 1 to 3, the same components are designated by the same reference numerals.

The light emitting device 11 includes a housing 15 and a light emitting device main body 17.
The housing 15 has a housing body 19 and a window portion 21. The housing main body 19 houses the light emitting device main body 17. A rectangular opening 19A is formed on the front side of the housing body 19.
The window portion 21 is provided so as to close the opening portion 19A.

The light emitting device main body 17 has a support member 23, a plurality of openings 24, a plurality of convex lenses 26, and a plurality of light emitting elements 28.
The support member 23 is a columnar member, and the lower end thereof is fixed to the bottom plate of the housing body 19. The support member 23 supports a plurality of openings 24, a plurality of convex lenses 26, and a plurality of light emitting elements 28.

The plurality of openings 24 are provided on the front surface of the support member 23 facing the window portion 21. The plurality of openings 24 are arranged in the ± Z direction at intervals.
The plurality of convex lenses 26 are arranged in the support member 23 so as to face one opening 24 in the + Y direction. As a result, the plurality of convex lenses 26 are arranged in the ± Z direction.

The plurality of light emitting elements 28 are provided in the support member 23. The plurality of light emitting elements 28 are arranged at positions where light can be irradiated in the + Y direction via one convex lens 26, respectively. The plurality of light emitting elements 28 are arranged in the ± Z direction.
The plurality of light emitting elements 28 irradiate the light receiving device 12 with light via the convex lens 26 and the opening 24.

[Light receiving device]
The light receiving device 12 will be described with reference to FIGS. 1 to 7. In FIGS. 1 to 7, the same components are designated by the same reference numerals.
In FIG. 5, Ra is the light emitted from the first display unit 35 (hereinafter referred to as “light Ra”), and Ra ₁ is a part of the light Ra reflected from the inclined surface 39c (hereinafter referred to as “light Ra ₁ ”). ), Ra ₂ is the rest of the light Ra that has passed through the inclined surface 39c (hereinafter, “light Ra ₂ ”), Rb is the light emitted from the second display unit 36 (hereinafter, “light Rb”), and Rc is. The light emitted from the third display unit 37 (hereinafter referred to as “light Rc”) is shown.
Further, in FIG. 5, D1 is a first direction in which the light Ra ₂ travels (hereinafter, referred to as “first direction D1”), and D2 is a second direction in which the light Ra ₁ travels (hereinafter, “second direction D2”). ") Are shown respectively. The first direction D1 is a direction from the other side in the width direction of the lane L to one side in the width direction. The second direction D2 is also the direction in which the optical guide member 39 extends.

The light receiving device 12 includes a housing 31, a light receiving device main body 33, first to third display units 35 to 37, and a light emitting unit 41.
The housing 31 has a housing body 42 and a window portion 44. The housing body 42 houses the light receiving device body 33.

The housing body 42 has a bottom plate 42A, side plates 42B and 42C, a back plate 42D, a top plate 42E, and a front plate 42F.
The bottom plate 42A is a rectangular plate material, and is fixed on the island IR.
The lower end of the side plate 42B is located on the approach side of the vehicle A, and is connected to one end of the bottom plate 42A located in the + X direction. The side plate 42B extends upward from the bottom plate 42A. The side plate 42B has an outer surface 42b that faces the ± X direction (the length direction of the lane L).

The side plate 42C is connected to the other end of the bottom plate 42A whose lower end is located in the −X direction. The side plate 42C extends upward from the bottom plate 42A. The side plate 42C faces the side plate 42B in the + X direction. The side plate 42C has an outer surface 42c facing the ± X direction (the length direction of the lane L).
The side plates 42B and 42C are arranged in a direction intersecting the width direction of the lane L.
An opening 42Ba into which the other end of the light guide member 39, which will be described later, which constitutes the light emitting portion 41 is inserted, is formed in the upper portion of the side plate 42B. The opening 42Ba is formed at the same height as the first display unit 35.

The lower end of the back plate 42D is arranged on the back side of the light receiving device main body 33. The back plate 42D is connected to one end of the bottom plate 42A located in the + Y direction. The back plate 42D extends upward from the bottom plate 42A. One end of the back plate 42D arranged in the + X direction is connected to the side plate 42B. The other end of the back plate 42D arranged in the −X direction is connected to the side plate 42C.

The top plate 42E faces the bottom plate 42A in the −Z direction, and is connected to the upper ends of the side plates 42B, 42C and the back plate 42D.
The front plate 42F is provided so as to close the front surface of the structure including the bottom plate 42A, the side plates 42B, 42C, and the back plate 42D. The front plate 42F is configured to be openable and closable with respect to the structure.
The window portion 44 is provided in the opening portion 42F so as to close the opening portion 42Fa.

The light receiving device main body 33 has a support member 47, a plurality of openings 49, a plurality of convex lenses 51, and a plurality of light receiving elements 52.
The support member 47 is a columnar member, and its lower end is fixed to the bottom plate of the housing body 42. The support member 47 supports a plurality of openings 49, a plurality of convex lenses 51, and a plurality of light receiving elements 52.

The plurality of openings 49 are provided in front of the support member 47 facing the window 44. The plurality of openings 49 are arranged in the ± Z direction at intervals.
The plurality of convex lenses 51 are arranged in the support member 47 so as to face one opening 49 in the −Y direction. The plurality of convex lenses 51 are arranged in the ± Z direction.

The plurality of light receiving elements 52 are provided in the support member 47 and face one side in the width direction of the lane L. The plurality of light receiving elements 52 are arranged so as to face one light emitting element 28 in the −Y direction.
The light receiving element 52 receives the light emitted from the light emitting element 28 (light emitted from one side in the width direction of the lane L) via the window portions 44, 49 and the convex lens 51. An optical axis G is formed between the light emitting element 28 and the light receiving element 52 facing each other in the ± Y direction. A plurality of optical axes G exist at intervals in the ± Z direction.

[1st to 3rd display units]
The first to third display units 35 to 37 are provided on the front surface of the support member 47 located above the region where the plurality of openings 49 are arranged. That is, the first to third display units 35 to 37 are arranged on one side in the width direction of the lane L of the light receiving device main body 33. The first to third display units 35 to 37 face the window unit 44 in the −Y direction.
The first display unit 35 is arranged at the end on the side where the vehicle A enters. The third display unit 37 is arranged at an end portion located on the opposite side of the end portion where the first display unit 35 is arranged. The second display unit 36 is arranged between the first display unit 35 and the third display unit 37.

The arrangement relationship of the first to third display units 35 to 37 shown in FIGS. 2, 4, and 5 is an example, and is not limited to these positions.

The first display unit 35 is a display unit that emits light according to the light detection state of the plurality of light receiving elements 52. Specifically, the first display unit 35 emits light when all the light receiving elements 52 receive light from the light emitting elements 28 facing each other in the −Y direction. The first display unit 35 does not emit light when even one of the plurality of light receiving elements 52 cannot receive the light from the light emitting element 28.
Therefore, when installing the light receiving device 12 on the island IR, the mounting operator searches for the position of the light receiving device 12 in which the first display unit 35 emits light while adjusting the height and orientation of the light receiving device 12, and at this position. The light receiving device 12 is installed on the island IR. As a result, the installation of the light receiving device 12 is completed after adjusting all the optical axes.

The second display unit 36 is a display unit that emits light according to the light detection state of the plurality of light receiving elements 52. The second display unit 36 emits light when an abnormality occurs in the light detection state of the plurality of light receiving elements 52.

The third display unit 37 is a display unit that emits light when the power of the light receiving device main body 33 is on and does not emit light when the power is off.
As the first to third display units 35 to 37, for example, a light emitting diode (LED) can be used.

[Overall configuration of light emitting part]
The light emitting unit 41 has a configuration including the above-mentioned first display unit 35 and an optical guide member 39.

[Optical guide member]
The optical guide member 39 is a transparent member having a prismatic shape extending in one direction.
The optical guide member 39 is fixed to the side plate 42B with an adhesive or the like with the other end inserted into the opening 42Ba.
By providing the other end of the optical guide member 39 in the opening 42Ba in this way, the attachment position of the optical guide member 39 becomes clear, so that the attachment work of the optical guide member 39 can be easily performed.
The optical guide member 39 extends from the opening 42Ba toward the side plate 42C. One end of the optical guide member 39 is arranged between the first display unit 35 and the front plate 42F. One end of the optical guide member 39 faces the first display unit 35 in the + Y direction.

The optical guide member 39 has planes 39a and 39b, an inclined surface 39c, and an end surface 39d.
The plane 39a is a surface facing the first display unit 35. The plane 39a is orthogonal to the traveling direction (first direction D1) of the light Ra from the first display unit 35. The light Ra passes through the plane 39a and enters the inside of the light guide member 39.
The plane 39b is a plane arranged on the opposite side of the plane 39a and parallel to the plane 39a. The length of the plane 39b in the direction from the other end surface 39d to the side plate 42C is shorter than the length of the plane 39a.

[Inclined surface]
The inclined surface 39c is a surface connecting the end of the flat surface 39b on the side plate 42C side and the end of the flat surface 39a on the side plate 42C side. The inclined surface 39c is inclined so as to reduce the thickness of the optical guide member 39 in the ± Y direction from the side plate 42B toward the side plate 42C. The inclined surface 39c is inclined with respect to the first direction D1 and the planes 39a and 39b. The angle θ ₁ formed by the plane 39a and the inclined surface 39c can be, for example, 45 °.
The inclined surface 39c guides the light Ra ₁ , which is a part of the light Ra, to the other end surface 39d arranged in the direction from the inclined surface 39c toward the opening 42Ba (second direction D2), and at the rest of the light Ra. A certain light Ra ₂ is transmitted in the first direction D1. The inclined surface 39c functions as a half mirror.
That is, the light emitting unit 41 provided with the inclined surface 39c irradiates the light Ra from the first display unit 35 into the first direction D1 and the second direction D2 different from the first direction D1.

In this way, a part of the light Ra from the first display unit 35 is guided in the second direction D2, and the remaining portion of the light Ra from the first display unit 35 is irradiated in the first direction D1. By having the optical guide member 39 including the surface 39c, it is possible to confirm the state (presence / absence of light emission) of the first display unit 35 from two directions.

The other end surface 39d is the end surface of the other end of the optical guide member 39 arranged in the opening 42Ba. The other end surface 39d is a surface orthogonal to the second direction D2. The other end surface 39d is exposed from the outer surface 42b of the side plate 42B. The other end surface 39d is visible from the outside of the side plate 42B. The light Ra ₁ reflected by the inclined surface 39c and traveling in the second direction D2 passes through the other end surface 39d.

As described above, the optical guide member 39 is provided in the opening 42Ba formed in the side plate 42B provided at the position adjacent to the front plate 42F of the housing 31 facing the plurality of light receiving elements 52 and the first display unit 35. By arranging the other end portion, it is possible to confirm the state of the first display unit 35 not only from the front surface of the housing 31 but also from the lateral direction (second direction D2) of the housing 31. Become.
This prevents the mounting operator from blocking the optical axis G formed between the light emitting element 28 and the light receiving element 52 when adjusting the optical axis between the light emitting device 11 and the light receiving device 12. ,
It is possible to shorten the time required for adjusting the optical axis when the light receiving device 12 is installed.

As the transparent material used as the material of the optical guide member 39, for example, acrylic resin, polycarbonate resin, glass, or the like can be used.

According to the light receiving device 12 of the first embodiment, the light Ra from the first display unit 35 and the first display unit 35 that emit light when all the light receiving elements 52 detect the light from the light emitting element 28. By providing a light emitting unit 41 having an optical guide member 39 for guiding the light beam to the first direction D1 and the second direction D2 different from the first direction D1, not only the front side of the housing 31 but also the housing 31 It is possible to confirm the state of the first display unit 35 from the side of the above.
As a result, when the light receiving device 12 is installed, when the mounting operator adjusts the optical axis, the optical axis G formed between the light emitting element and the light receiving element is not blocked, so that the optical axis can be adjusted. The time required can be shortened.

The vehicle detector 1 having the light emitting device 11 and the light receiving device 12 having the above configuration can obtain the same effect as the light receiving device 12 described above.

In the first embodiment, as an example, the case where the first display unit 35 emits light when all the light receiving elements 52 detect the light from the light emitting element 28 has been described as an example. When all the light receiving elements 52 detect the light from the light emitting element 28, the first display unit 35 stops the light emission, and at least one light receiving element 52 emits the light from the light emitting element 28. A first display unit that emits light when it is not detected may be used.
Further, in the first embodiment, the case where the light receiving device 12 has a plurality of light receiving elements 52 has been described as an example, but the present invention can also be applied to a light receiving device having only one light receiving element.

<First modification of the first embodiment>
The light receiving device 55 according to the first modification of the first embodiment will be described with reference to FIGS. 8 to 10. In FIGS. 1 to 10, the same components are designated by the same reference numerals. In FIGS. 8 and 10, D3 indicates a second direction (hereinafter referred to as “second direction D3”) in which the light Ra ₁ travels.

[Light receiving device]
The light receiving device 55 has the same configuration as the light receiving device 12 of the first embodiment except that the opening 42Bb is formed in the side plate 42B instead of the opening 42Ba and the light emitting portion 56 is provided in place of the light emitting portion 41. Has been done.

The opening 42Bb is formed at a position lower than the opening 42Ba described above. The opening 42Bb opens in a direction diagonally upward.

The light emitting unit 56 is configured in the same manner as the light emitting unit 41 except that it has the light guide member 58 instead of the light guide member 39 constituting the light emitting unit 41.
The optical guide member 58 is configured in the same manner as the optical guide member 39, except that the shape of the other end of the optical guide member 39 is different.

At the other end of the optical guide member 58, the other end surface 58a inclined with respect to the second direction D3 is formed. The other end of the optical guide member 58 is fixed in a state of being inserted into the opening 42Bb.
The optical guide member 58 inserted into the opening 42Bb extends diagonally upward. In this state, the inclined surface 39c is arranged at a position capable of receiving the light from the first display unit 35 in the −Y direction.

According to the light receiving device 55 according to the first modification of the first embodiment, an opening 42Bb in which the other end of the optical guide member 58 is arranged is formed at a position lower than the first display unit 35. By arranging the optical guide member 58 so as to extend diagonally upward from the opening 42Bb, the state of the first display unit 35 can be confirmed from a position lower than the first display unit 35.
This is particularly effective when the first display unit 35 is arranged at a high position.

<Second variant of the first embodiment>
The light receiving device 60 according to the second modification of the first embodiment will be described with reference to FIG. 11. In FIG. 11, Rb ₁ is a part of the light Rb reflected by the inclined surface 63c of the optical guide member 63 (hereinafter, “light Rb ₁ ”), and Rb ₂ is the light Rb transmitted through the inclined surface 63c of the optical guide member 63. The balance of (hereinafter, "light Rb ₂ "), D4 is the first direction in which the light Rb ₂ travels (hereinafter, referred to as "first direction D4"), and D5 is the second direction in which the light Rb ₁ travels (hereinafter, "light Rb 2"). "Second direction D5") are shown respectively. In FIG. 11, the same components as those of the structure shown in FIG. 5 are designated by the same reference numerals.

[Light receiving device]
The light receiving device 60 is configured in the same manner as the light receiving device 12 of the first embodiment except that the opening 42Ca is formed in the side plate 42C and the light emitting unit 61 is provided instead of the light emitting unit 41.
The opening 42Ca is formed in the upper part of the side plate 42C. The opening 42Ca is formed at a position where the optical guide member 63 can be arranged between the second display portion 36 and the window portion 44.

[Light emitting part]
The light emitting unit 61 includes a first display unit 35, a second display unit 36, and optical guide members 39 and 63.

[Optical guide member]
The optical guide member 63 has flat surfaces 63a and 63b, an inclined surface 63c, and an end surface 63d. The optical guide member 63 is fixed to the side plate 42C with the other end inserted into the opening 42Ca. The other end surface 63d of the other end is exposed from the outer surface 42c of the side plate 42C. The optical guide member 63 extends from the side plate 42C toward the side plate 42B in the + X direction.

The plane 63a of the optical guide member 63 faces the second and third display units 36 and 37 in the −Y direction. The plane 63b of the optical guide member 63 faces the third display unit 37. The planes 63a and 63b of the optical guide member 63 transmit the light Rc from the third display unit 37.

The portion of the plane 63a located at one end of the optical guide member 63 faces the second display portion 36. The inclined surface 63c of the optical guide member 63 is arranged so as to face the light Rb emitted from the second display unit 36 in the first direction D4.

The inclined surface 63c of the optical guide member 63 reflects the light Rb ₂ which is a part of the light Rb from the second display unit 36 in the second direction D5 (the direction orthogonal to the first direction D4). At the same time, the light Rb ₁ which is the rest of the light Rb is transmitted in the first direction D4.

According to the light receiving device 60 according to the second modification of the first embodiment, by further having the optical guide member 63 having the above configuration, not only the front side of the housing 31 but also the side plate 42C side. The state of the second display unit 36 can be confirmed.

In the second modification of the first embodiment, as an example, a case where the optical guide member 63 is fixed to the side plate 42C so as to extend in the ± X direction has been described as an example. However, for example, the optical guide has been described. The member 63 may also have one end facing the second display portion 36, and the other end and the opening 42Ca may be arranged at a position lower than the one end.
With such a configuration, the same effect as that of the light receiving device 55 of the first modification of the first embodiment shown in FIG. 8 can be obtained.

<Second embodiment>
The light receiving device 70 of the second embodiment will be described with reference to FIG. In FIG. 12, the same components as those of the structure shown in FIG. 5 are designated by the same reference numerals.

[Light receiving device]
The light receiving device 70 is configured in the same manner as the light receiving device 12 of the first embodiment except that the opening 42Bc is formed in place of the opening 42Ba and the light emitting unit 71 is provided in place of the light emitting unit 41. There is.
The opening 42Bc is formed so as to penetrate the upper part of the side plate 42B. The opening 42Bc has a smaller opening diameter than the opening 42Ba and has a cylindrical shape.

[Light emitting part]
The light emitting unit 71 is configured in the same manner as the light emitting unit 41 except that it has the light guide member 73 instead of the light guide member 39 described in the first embodiment.

[Optical guide member]
The optical guide member 73 is fixed with the other end inserted into the opening 42Bc. One end of the optical guide member 73 is gently bent so that one end surface 73a has a curved shape facing a part of the first display portion 35 in the + Y direction. The other end surface 73b of the optical guide member 73 is exposed from the outer surface of the side plate 42B.

The optical guide member 73 guides the light Ra ₁ , which is a part of the light Ra taken in from the one end surface 73a, in the direction toward the other end surface 73b (second direction D2). The light Ra ₂ , which is the rest of the light Ra, is irradiated in the first direction D1.
As the optical guide member 73, for example, an optical fiber 75 can be used.

According to the light receiving device 70 of the second embodiment, the one end surface 73a faces a part of the first display unit 35, and the other end surface 73b is provided with the optical fiber 75 arranged in the opening 42Bb. The state of the first display unit 35 can be confirmed from the first direction D1 and the second direction D2.

In the second embodiment, the height of the other end surface 73b may be lower than that of the one end surface 73a of the optical guide member 73. With such a configuration, the same effect as that of the light receiving device 55 shown in FIG. 8 can be obtained.
Further, an optical fiber that replaces the optical guide member 63 shown in FIG. 11 may be separately provided. With such a configuration, the same effect as that of the light receiving device 60 shown in FIG. 11 can be obtained.

<Third embodiment>
The light receiving device 80 of the third embodiment will be described with reference to FIG. In FIG. 13, the same components as those of the structure shown in FIG. 5 are designated by the same reference numerals.

[Light receiving device]
The light receiving device 80 according to the first embodiment, except that the light receiving device 80 forms the opening 42Bd in place of the opening 42Ba and has the window portion 81 and also has the light emitting unit 83 in place of the light emitting unit 41. It is configured in the same manner as 12.
The opening 42Bc is formed in the side plate 42B so as to face the second direction display portion 85 constituting the light emitting portion 83 in the −X direction.
The window portion 81 is provided in the opening portion 42Bd so as to close the opening portion 42Bd. The window portion 81 passes the light Rd from the second direction display portion 85.

[Light emitting part]
The light emitting unit 83 includes a first directional display unit 84 and a second directional display unit 85.
The first directional display unit 84 has the same configuration as the first display unit 35 described in the first embodiment, and emits light when all the light receiving elements receive light.
The first directional display unit 84 is provided on the front side of the support member 47 like the first display unit 35. The first directional display unit 84 is arranged on the side where a plurality of light receiving elements are provided.

The second directional display portion 85 is provided on the side surface side of the support member 47 facing the window portion 81. The second directional display unit 85, like the first directional display unit 84, emits light when all the light receiving elements receive light. That is, the second directional display unit 85 emits light at the same timing as the first directional display unit 84, and stops emitting light at the same timing.

According to the light receiving device 80 of the third embodiment, the first directional display unit 84, which is provided on the front side of the support member 47 and emits light when all the light receiving elements receive light, and the support member 47. By having a second direction display unit 85 provided on the side surface side and emitting light when all the light receiving elements receive light, two directions (first direction D1 and second direction D2) are provided. It is possible to confirm the light detection state of a plurality of light receiving elements from.

In the third embodiment, similarly to the second display unit 36, the display unit that emits light when an abnormality occurs in the light detection state of the number of light receiving elements is supported by the support member 47 facing the side plate 42C. A window portion may be provided on the side plate 42C which is provided on the side surface side of the above and faces the display portion.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various aspects of the present invention are described within the scope of the claims. It can be transformed and changed.

1 ... Vehicle detector 11 ... Light emitting device 12, 55, 60, 70, 80 ... Light receiving device 15, 31 ... Housing 17 ... Light emitting device main body 19, 42 ... Housing body 19A, 24, 42Ba, 42Bb, 42Bc, 42Bd , 42Ca, 42Fa, 49 ... Opening 21,44,81 ... Window 23,47 ... Support member 26,51 ... Convex lens 28 ... Light emitting element 33 ... Light receiving device main body 35 ... First display 36 ... Second display Part 37 ... Third display unit 39, 58, 63, 73 ... Optical guide member 39a, 39b ... Flat surface 39c ... Inclined surface 39d, 58a, 63d, 73b ... End surface 41, 56, 61, 71, 83 ... Light emitting unit 42A ... Bottom plate 42B, 42C ... Side plate 42b, 42c ... Outer surface 42D ... Back plate 42E ... Top plate 42F ... Front plate 52 ... Light receiving element 73a ... One end surface 75 ... Optical fiber 84 ... First direction display unit 85 ... First Display unit for 2 directions A ... Vehicle D1, D4 ... 1st direction D2, D3, D5 ... 2nd direction G ... Optical axis L ... Lanes Ra, Ra ₁ , Ra ₂ , Rb, Rb ₁ , Rb ₂ , Rc, Rd ... Optical θ ₁ ... Angle

Claims (7)

It is a light receiving device equipped with a light receiving device main body that receives light emitted from one side in the width direction of the lane.
The light receiving device main body faces one side in the width direction of the lane, and has a plurality of light receiving elements that receive the light.
A display unit that emits light according to the light detection state of the plurality of light receiving elements is included, and light from the display unit is irradiated in a second direction different from the first direction toward one side in the width direction of the lane. Light emitting part and
Equipped with
The display unit is a light receiving device that emits light only when all the light receiving elements receive the irradiated light . The display unit is arranged on one side in the width direction of the lane of the light receiving device main body.
The light receiving device according to claim 1, wherein the light emitting unit has an optical guide member that guides a part of the light from the display unit in the second direction and guides the rest of the light in the first direction. .. A side plate having an outer surface facing the side opposite to the light receiving device main body in the length direction of the lane is provided.
The side plate is formed with an opening in which the other end of the optical guide member, which is located on the side opposite to the one end to which the light from the display portion is irradiated, is arranged.
The light receiving device according to claim 2, wherein the other end is exposed from the outer surface. The optical guide member is a transparent member extending in one direction.
The transparent member is inclined with respect to the first direction, guides a part of the light to the end surface of the transparent member exposed from the opening, and guides a part of the light to one end facing the display portion. The light receiving device according to claim 3, further comprising an inclined surface that allows the rest of the light to pass through on one side in the width direction of the lane. The light receiving device according to claim 2 or 3, wherein the optical guide member is an optical fiber in which one end surface faces a part of the display unit and the other end surface is arranged in the opening portion. The display unit is arranged on the same side as the light receiving element, and the light detection state of the light receiving element is the same as that of the first direction display unit facing the first direction and the first direction display unit. The light receiving device according to claim 1, further comprising a second direction display unit that emits light according to the above direction and emits light so that the light is directed in the second direction. The light receiving device according to any one of claims 1 to 6,
A light emitting device provided on one side in the width direction of the lane and having a light emitting element facing the light receiving element and irradiating light.
A vehicle detector equipped with.

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