JP2018077156A - Optical unit and distance measuring sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small optical unit having good reflection efficiency. An optical unit 1 includes a light projecting unit 10 provided with a light projecting lens 12 that converts light emitted from a light source 11 that irradiates light into parallel light, and an incident surface 31 on which parallel light is incident. The first reflecting surface 32, which is a parabolic surface capable of collecting the parallel light incident on the incident surface 31 at one point, is reflected by the first reflecting surface 32 between the first reflecting surface 32 and the one point. A second reflecting surface 33 made of a bi-curved surface that allows light to be incident and collected at another point different from the one point, and a second reflecting surface 33 between the second reflecting surface 33 and the other point. A light receiving lens 30 having a third reflecting surface 34 and a third reflecting surface 34 are provided at a position where the other point is inverted when the reflected light is incident and the other point is inverted toward the second reflecting surface 33. The light receiving unit 20 is provided with a light receiving sensor 40 that detects the light reflected by the third reflecting surface 34. [Selection diagram] Fig. 1

Description

  The present invention relates to an optical unit including a light projecting unit that emits light and a light receiving unit that acquires light, and a distance measuring sensor including such an optical unit.

  2. Description of the Related Art Conventionally, a technique has been used in which light is irradiated to a predetermined range set in advance, light reflected by an object is acquired, and the presence or absence of the object is detected. In such a technique, an optical device is used for the purpose of converting the size of incident light (light beam) or synthesizing light (light beam) (for example, Patent Documents 1 and 2).

  A beam expander used for light beam size conversion generally requires time and effort for various adjustments, and is configured using a plurality of lenses, resulting in an increase in size. In the optical element described in Patent Document 1, in order to improve such a problem, the Cassegrain optical system is configured in a single optical element, so that the adjustment work is saved and the size is reduced.

  Further, in the distance measuring device described in Patent Document 2, the sub mirror of the Cassegrain optical system is integrated with the light projecting unit to reduce the size, and the optical axis of the light projecting optical system is the same as the optical axis of the light receiving optical system. It is configured as follows.

JP 2010-60728 A JP-A-8-15413

  The technique described in Patent Document 1 requires a surface treatment such as a metal reflection film in order to reflect light on both the first reflection surface and the second reflection surface. Since such a metal reflective film has a reflectance that is not 100%, there is a possibility that the amount of attenuation of light increases due to multiple reflections as in the technique described in Patent Document 1, and the reflection efficiency deteriorates. Further, in the technique described in Patent Document 1, two parabolas are arranged so as to face each other with respect to the same focal position. For this reason, when the optical element is formed by injection molding using resin, for example, the accuracy of the distance between the two paraboloids depends on the accuracy of the mating surfaces of the molds on both sides. In addition to this, it is necessary to improve the accuracy of the mold fitting surface.

  Although the technique described in Patent Document 2 is miniaturized by folding the light receiving optical system, the thickness of the apparatus increases by arranging the light projecting optical system in series on the same axis. In addition, the optical axis adjustment and position adjustment of the primary mirror and the secondary mirror are required in the light receiving optical system, and the optical axis adjustment and position adjustment of the light source and the lens are also required in the light projecting optical system. Further, if the secondary mirror on the light receiving side and the light projecting optical system are integrated, the adjustment may be complicated. In addition, since the light projecting optical system and the light receiving optical system are coaxial, and the light projecting side optical system is disposed in front of the apparatus, it is physically larger than the light projecting beam (the beam diameter of the beam). A part of the light-receiving surface is blocked by a light projecting lens (having a diameter) and a peripheral holding member, which may cause a decrease in distance performance. Furthermore, when the object to be measured is located at a short distance, the reflected light is concentrated around the light projection beam, so that it may be blocked by the light projection optical system of the apparatus itself and may not be detected correctly. In addition, a polygon mirror combined with a plane mirror is used to change the distance measurement direction. However, in the technique described in Patent Document 2, since the rotation axis of the rotation mirror is on the optical axis, a plurality of surfaces of the polygon mirror are arranged at the rotation center. It is not easy to place. By shifting the rotation axis and the optical axis from each other, operations in multiple directions can be easily performed, but the mirror surface of the polygon mirror and the light receiving surface of the light receiving optical system are greatly displaced, resulting in a large loss of light reception. Become.

  Therefore, a compact optical unit with good reflection efficiency and a distance measuring sensor including such an optical unit are required.

  A characteristic configuration of the optical unit according to the present invention includes a light projecting unit provided with a light source that emits light and a light projecting lens that converts light emitted from the light source into parallel light, and an incident surface on which the parallel light is incident , A first reflecting surface composed of a parabolic surface capable of collecting parallel light incident on the incident surface at one point, and light reflected by the first reflecting surface between the first reflecting surface and the one point And is reflected by the second reflecting surface between the second reflecting surface and the other one point. The second reflecting surface is a hyperboloid that can be collected at another point different from the one point. Is provided at a position where the other point is inverted by the third reflecting surface and a light receiving lens having a third reflecting surface composed of a plane that reverses the other point toward the second reflecting surface. , A light receiving sensor for detecting light reflected by the third reflecting surface In that it includes a light receiving portion which is provided with.

  With such a characteristic configuration, the shapes of the mutually facing surfaces can be made different in each of the incident surface, the first reflecting surface, the second reflecting surface, and the third reflecting surface. In addition, conversion from parallel light to convergent light can be performed. Further, according to the above-described characteristic configuration, the incident surface and the third reflecting surface are arranged on one side, and the first reflecting surface and the second reflecting surface are arranged on the other side, so that the optical performance necessary for condensing is obtained. All the surfaces can be arranged on one side (the other side), and it becomes possible to reduce an error factor during manufacturing. Furthermore, by folding the optical path, the distance from the incident surface to the light receiving sensor can be shortened and thinned. Therefore, a small optical unit with good reflection efficiency can be realized.

  The first reflecting surface and the second reflecting surface are preferably reflecting surfaces that perform total reflection.

  With such a configuration, there is no light attenuation on the first reflection surface and the second reflection surface, so that the light reflection efficiency can be increased. Therefore, it is possible to reduce light loss in the optical unit.

  Further, it is preferable that the third reflecting surface is formed in a concave portion provided on an end surface on the incident surface side of the light receiving lens.

  With such a configuration, the length of the light receiving lens along the axial direction can be shortened. Therefore, the optical unit can be reduced in size.

  Further, the light projecting unit is provided on a back surface side of the first reflecting surface in the light receiving lens, and the light receiving lens has a cutout portion that allows light from the light projecting unit to pass through a part of the first reflecting surface. Is preferably formed.

  With such a configuration, it is possible to prevent the light irradiated from the light projecting unit from being attenuated by the light receiving lens.

  Further, it is preferable that the light receiving lens is provided with a condensing surface that collects light inverted by the third reflecting surface on the detection surface of the light receiving sensor between the third reflecting surface and the light receiving sensor. .

  With such a configuration, the light reflected by the third reflecting surface can be easily collected on the detection surface of the light receiving sensor. Therefore, the light receiving efficiency of the light receiving lens can be increased.

  In the distance measuring sensor according to the present invention, the light from the optical unit and the light projecting unit is scanned over a predetermined range, and the scanned light is reflected on an object existing within the predetermined range. It is preferable to include a conversion unit that converts reflected light in a direction orthogonal to the incident surface.

  With such a configuration, it is possible to realize a small range sensor with a wide range of wide angles by using a thin and highly efficient light receiving lens.

It is a side view of an optical unit. It is a perspective view of a light receiving lens. It is a perspective view of a light receiving lens. It is the figure which showed an example of the detection range of the object by a ranging sensor. It is side sectional drawing of a ranging sensor.

1. Optical Unit The optical unit according to the present invention has good light reflection efficiency and is small in size. Hereinafter, the optical unit 1 of the present embodiment will be described.

  FIG. 1 shows a side view of the optical unit 1. The optical unit 1 includes a light projecting unit 10 and a light receiving unit 20. The light projecting unit 10 is provided with a light source 11 and a light projecting lens 12, and the light receiving unit 20 is provided with a light receiving lens 30 and a light receiving sensor 40. In FIG. 1, for easy understanding, the light receiving lens 30 is shown in a cross-sectional view.

  The light source 11 is configured using, for example, a laser or an LED, and emits light. The light emitted from the light source 11 is incident on a light projecting lens 12 described later.

  The light projection lens 12 converts light emitted from the light source 11 into parallel light. The light emitted from the light source 11 spreads radially. The light projecting lens 12 converts the light spreading radially in this way into parallel light traveling along a predetermined direction. Thereby, the light from the light source 11 can be irradiated only in a predetermined direction. The parallel light from the light projecting lens 12 is irradiated to the outside of the optical unit 1. Hereinafter, the parallel light emitted from the light projecting lens 12 will be referred to as a “light projecting beam” as necessary.

  In the present embodiment, the light receiving lens 30 has an incident surface 31, a first reflecting surface 32, a second reflecting surface 33, a third reflecting surface 34, and a condensing surface 35, and these four surfaces are axes of each other. Are arranged on the same axis.

  Parallel light is incident on the incident surface 31. As will be described in detail later, the parallel light is light that is irradiated to the outside of the light projecting lens 12 or the optical unit 1 and hits and reflects an object to be measured. The incident surface 31 is a flat surface and is configured to transmit light. The parallel light incident on the incident surface 31 is preferably incident along a direction orthogonal to the incident surface 31.

  The first reflecting surface 32 is configured as a paraboloid capable of collecting parallel light incident on the incident surface 31 at one point. A paraboloid is a surface of a rotating body formed by rotating a parabola (a rotating paraboloid), and light incident parallel to the paraboloid is focused on a single focal point on the paraboloid. It has the characteristics to gather. In the present embodiment, the first reflecting surface 32 is configured by using such a paraboloid so that the parallel light transmitted through the incident surface 31 can be collected at a predetermined point (corresponding to the “focal point”). It is configured. Hereinafter, in order to facilitate understanding, it is assumed that the “predetermined point” is the point A. Accordingly, the first reflecting surface 32 is configured as a paraboloid that can collect incident parallel light at the point A.

  Further, it is preferable that the first reflecting surface 32 is constituted by a reflecting surface that performs total reflection. Therefore, the first reflecting surface 32 does not need to be coated to form a mirror surface, for example. Thereby, when light is reflected by the first reflecting surface 32, attenuation of light intensity can be prevented.

  The second reflecting surface 33 is a hyperboloid that allows the light reflected by the first reflecting surface 32 to enter between the first reflecting surface 32 and the point A and collect it at another point different from the point A. Composed. As described above, the light reflected by the first reflecting surface 32 is configured to gather at the point A. The second reflecting surface 33 is disposed between the first reflecting surface 32 and the point A, and reflects incident light. As will be described later, since the second reflecting surface 33 is configured by a reflecting surface that performs total reflection, the light reflected by the first reflecting surface 32 does not actually reach the point A.

  A hyperboloid is a surface obtained by rotating a pair of hyperbolas around the same axis. When light is incident on a surface formed by one hyperbola, the surface formed by the other hyperbola It is a surface constructed so that light can be collected at the focal point. The second reflecting surface 33 is configured using one of the pair of hyperboloids. Therefore, the second reflecting surface 33 is a point B (second reflecting surface 33) that corresponds to the “other point” light reflected by the first reflecting surface 32 in the direction of the point A (the collected light). (Corresponds to the focal point of). In the following description, it is assumed that the “other point” is the point B.

  In addition, it is preferable that the second reflecting surface 33 is configured by a reflecting surface that performs total reflection. Accordingly, the second reflecting surface 33 does not need to be coated to form a mirror surface, for example. Thereby, when light is reflected by the second reflecting surface 33, attenuation of light intensity can be prevented. A physical quantity such as a focal length of the light receiving lens 30 is substantially determined by the first reflecting surface 32 and the second reflecting surface 33 described above.

  The third reflecting surface 34 is configured by a plane on which the light reflected by the second reflecting surface 33 is incident between the second reflecting surface 33 and the point B, and the point B is reversed to the second reflecting surface 33 side. . As described above, the light reflected by the second reflecting surface 33 is configured to be condensed at the point B. The third reflecting surface 34 is disposed between the second reflecting surface 33 and the point B, and reflects incident light. Therefore, the light reflected by the second reflecting surface 33 does not actually reach the point B.

  The third reflecting surface 34 is configured to reflect light incident at a predetermined incident angle at a reflection angle equal to the incident angle. Therefore, the point B is inverted to the point A side. The position where the point B is inverted is determined by the distance between the second reflecting surface 33 and the third reflecting surface 34 and the distance between the point B and the third reflecting surface 34, but in this embodiment, In the following description, it is assumed that the point B is inverted to the position of the point A. Thus, the third reflecting surface 34 is used for reversing the position and orientation of the surface that collects light.

  In the present embodiment, the third reflecting surface 34 is formed in the concave portion 50 provided on the end surface of the light receiving lens 30 on the incident surface 31 side. The third reflecting surface 34 is formed on the surface on the point A side of the bottom surface of the recess 50, that is, the surface of the recess 50. Such a third reflective surface 34 may be formed by fitting a flat mirror into the recess 50, or may be formed by performing vapor deposition on the bottom surface of the recess 50, for example.

  The condensing surface 35 is provided between the third reflecting surface 34 and the light receiving sensor 40, and collects the light inverted by the third reflecting surface 34 on the detecting surface of the light receiving sensor 40. Here, the light receiving sensor 40 is provided at a position where the point B is inverted by the third reflecting surface 34, and detects light reflected by the third reflecting surface 34. In the present embodiment, the position where the point B is inverted by the third reflecting surface 34 is the position of the point A. Therefore, the light receiving sensor 40 is provided at the position of the point A, and detects the light reflected by the third reflecting surface 34 at this position. Since the detection of light by the light receiving sensor 40 is known, the description thereof is omitted.

  Here, the light receiving lens 30 is configured so that the light reflected by the third reflecting surface 34 is collected at the position of the point A. Depending on the formation error of the light receiving lens 30, the light is slightly emitted with respect to the position of the point A. May be misaligned. Therefore, the condensing surface 35 is provided between the third reflecting surface 34 and the light receiving sensor 40 and is used as a lens that collects the light reflected by the third reflecting surface 34 on the detecting surface of the light receiving sensor 40. . Such a condensing surface 35 is a spherical surface and is configured as a transmission surface through which light is transmitted. The condensing surface 35 is preferably composed of a spherical surface centered on the intersection of the final condensing surface and the optical axis so that the condensed light (light flux) is incident from the orthogonal direction. As a result, it is possible to suppress the refraction effect on the collected light (light beam) as much as possible. The condensing surface 35 may be configured to refract light at the condensing surface 35 and condense it on the detection surface of the light receiving sensor 40.

  Although the optical unit 1 is configured as described above, the light projecting unit 10 is provided on the back surface side of the first reflecting surface 32 of the light receiving lens 30 in order to form the optical unit 1 compactly. “The back surface side of the first reflecting surface 32 in the light receiving lens 30” is outside of the surface of the light receiving lens 30 on the back side of the surface on which the first reflecting surface 32 is formed. Further, the light projecting unit 10 is disposed offset with respect to the axis of the light receiving lens 30 so that the light to be irradiated passes through the vicinity of the outer periphery in the light receiving surface of the light receiving lens 30.

  Although the light projecting unit 10 is provided at such a position, the light receiving lens 30 is formed with a notch 51 in a part of the first reflecting surface 32 so that the light from the light projecting unit 10 can be transmitted. . 2 is a perspective view of the light receiving lens 30 viewed from the back side of the first reflecting surface 32. FIG. 3 is a perspective view of the light receiving lens 30 when the incident surface 31 is viewed from the outside of the light receiving lens 30. Indicated. The light receiving lens 30 has a shape as shown in FIGS. 2 and 3 and is configured by using a transparent resin (for example, acrylic, polycarbonate, polymer, or the like) by, for example, injection molding. In this way, by using the light receiving lens 30 as a single component, it is possible to facilitate alignment with the light receiving sensor 40. Further, a notch 51 is formed such that a part of the first reflecting surface 32 and a part of the outer peripheral part of the incident surface 31 are notched during injection molding (see FIGS. 2 and 3). The light projecting unit 10 is arranged so that light from the light projecting unit 10 passes through the notch 51. Therefore, it is possible to prevent the light from the light projecting unit 10 from being attenuated.

2. Next, the distance measuring sensor according to the present invention will be described. The distance measuring sensor is used to detect a distance from the distance measuring sensor to an object existing within a predetermined range. As shown in FIG. 4, the distance measuring sensor 2 according to the present embodiment is provided in the vehicle 3 (for example, the front end portion of the vehicle 3) and exists around the vehicle 3 (in the example of FIG. 4, in front of the vehicle 3). Detect the distance to the object.

  FIG. 5 shows a side sectional view of the distance measuring sensor 2. As shown in FIG. 5, the distance measuring sensor 2 includes the optical unit 1 and the conversion unit 5 described above. Since the optical unit 1 has been described above, a description thereof will be omitted. The conversion unit 5 scans the light from the light projecting unit 10 over a predetermined range, and further, the light reflected by the scanned light hitting an object existing within the predetermined range is orthogonal to the incident surface 31. Convert to direction. The conversion unit 5 is preferably configured using a concave mirror, a convex mirror, or a polygon mirror formed by combining a plurality of plane mirrors. A range as shown in FIG. 4 is obtained by rotating such a conversion unit 5 with a motor having a rotation shaft arranged non-parallel to the axis of the light receiving lens 30 while irradiating light from the light projecting unit 10. R can be irradiated with light from the light projecting unit 10 through the window 52.

  The light from the light projecting unit 10 is reflected when it hits an object existing in a predetermined range (range R in FIG. 2). When the reflected light returns to the distance measuring sensor 2 through the window 52, the conversion unit 5 changes the direction of the light so that the light is incident in a direction orthogonal to the incident surface 31. The converted light is incident on the light receiving sensor 40 of the optical unit 1 as described above.

  The light projecting unit 10 and the light receiving sensor 40 are mounted on a single substrate 45, and the light receiving unit 30 and the light receiving unit 30 with respect to the light receiving lens 30 are fixed by fixing the housing 46 and the light receiving lens 30 that support the substrate 45 to each other. The sensor 40 can be positioned. Further, the light projecting unit 10 can be easily attached and detached from the light receiving lens 30, and the axis can be easily adjusted. Furthermore, by mounting the light projecting unit 10 and the light receiving sensor 40 on a single substrate 45, it is possible to reduce the cost compared to the case of using a plurality of substrates.

  Further, by irradiating light having a rectangular irradiation area that is long in the radial direction of the polygon mirror and thin in the circumferential direction along the outer peripheral portion of the polygon mirror having a small number of faces (the smaller the number of faces, the wider the angle can be made). Since the horizontal scanning angle can be increased and the light receiving area can be increased, the object can be detected over a wide range (horizontal direction and distance direction). Also, by setting a small number of surfaces, reducing the number of times that light straddles between surfaces, increasing the number of sections that can be scanned effectively, and shortening the section straddling the surfaces of polygon mirrors by narrowing the irradiation area of the light to be irradiated Is preferred.

  A result indicating that light is detected by the light receiving sensor 40 is transmitted to a calculation unit (not shown). On the other hand, information indicating that the light projecting unit 10 has emitted light is also transmitted to the calculation unit. The calculation unit calculates the time from when the light projecting unit 10 emits light until the light receiving sensor 40 receives the light, and calculates the time from the distance measuring sensor 2 by the product of the speed of light and 1/2 of the time. It is possible to calculate the distance to the object. Of course, it is also possible to correct and use the delay time required for signal processing of each functional unit for the above time.

  Note that it is preferable to provide a minimum light shielding at the boundary between the light projecting lens 12 and the light receiving lens 30 so as not to receive the reflected light of the window 52. The component that can be incident from the direction orthogonal to the light receiving lens 30 by the reflected light of an object at a relatively short distance (can be received by the light receiving sensor 40) is only in the vicinity of the projected light, and receives the projected light. This is because an object at a short distance cannot be detected if the lens 30 is disposed outside the light receiving surface of the lens 30. On the other hand, if the projected light is brought closer to the center of the light receiving lens 30, the reflection from the window 52 is increased, and as a result, the reflected light of the object at a short distance is buried and cannot be detected. Furthermore, even if the reflected light from the window 52 is blocked, the light receiving area is reduced and the distance capability of the distance measuring sensor 2 is reduced.

  Further, the light projecting lens 12 and the light receiving lens 30 are preferably offset from each other in the optical axis direction, and in particular, the light receiving lens 30 is preferably disposed closer to the window 52 than the light projecting lens 12. By providing the offset, the light projecting lens 12 can be disposed in the gap between the light receiving lenses 30, the light projecting / receiving circuit can be integrated, and the distance measuring sensor 2 can be configured compactly.

  Further, the light projecting lens 12 is disposed behind the light receiving lens 30 (backward when the light receiving lens 30 is viewed from the incident surface 31 side), so that only the light shaped into parallel light is near the inner periphery of the light receiving surface of the light receiving lens 30. Can pass through. Therefore, the size of the portion that blocks the light receiving lens 30 by the light projecting lens 12 and the holding member can be reduced, and only the magnitude of the light irradiated through the light projecting lens 12 can pass, and a large light collection area. Can be secured.

  As shown in FIG. 4, the distance measuring sensor 2 is provided on the vehicle 3. However, as described above, the projection optical axis is provided on the forefront of the distance measuring sensor 2, so that it is irradiated on the periphery of the vehicle body or the like. It is possible to scan over a wide range in the horizontal direction without blocking the light. Further, it is possible to prevent the ranging sensor 2 from being disposed so as to protrude from the vehicle 3 while realizing scanning over a wide range, and it is possible to contribute to the degree of freedom of design.

3. Other Embodiments In the above embodiment, the first reflecting surface 32 and the second reflecting surface 33 are described as reflecting surfaces that perform total reflection. However, both the first reflecting surface 32 and the second reflecting surface 33, or one of them. May be a reflecting surface that does not perform total reflection. That is, both or one of the first reflecting surface 32 and the second reflecting surface 33 may form a mirror surface by vapor deposition, for example.

  In the above embodiment, the third reflecting surface 34 is described as being formed in the recess 50 provided on the end surface on the incident surface 31 side of the light receiving lens 30, but the third reflecting surface 34 is not formed in the recess 50. Alternatively, it may be formed on a part of the incident surface 31.

  In the above embodiment, the light projecting unit 10 is provided on the back surface side of the first reflecting surface 32 in the light receiving lens 30, and the light receiving lens 30 passes light from the light projecting unit 10 to a part of the first reflecting surface 32. However, the light projecting unit 10 may be disposed on the side of the light receiving lens 30. In this case, if the light receiving lens 30 does not exist in the light path (optical path) from the light projecting unit 10 (when light does not pass through the light receiving lens 30), the light receiving lens 30 does not need to be provided with the notch 51. good.

  In the said embodiment, although the 3rd reflective surface 34 demonstrated as inverting the point B which is the focus of the 2nd reflective surface 33 to the position of the point A which is the focus of the 1st reflective surface 32, it is the 3rd reflective surface. 34 can be arranged so that the point B which is the focal point of the second reflecting surface 33 is inverted to a position different from the position of the point A which is the focal point of the first reflecting surface 32.

  In the above embodiment, the distance measuring sensor 2 is provided at the front end portion of the vehicle 3 in FIG. 4 and the distance to an object existing in front of the vehicle 3 is detected. 3 may be configured to detect a distance to an object existing behind the vehicle 3, or may be configured to detect a distance to an object present on the side of the vehicle 3. In these cases, it is preferable to provide them at the rear end and the side end of the vehicle 3, respectively.

  The present invention can be used for an optical unit including a light projecting unit that emits light and a light receiving unit that acquires light, and a distance measurement sensor including such an optical unit.

1: Optical unit 2: Distance sensor 5: Conversion unit 10: Light projecting unit 11: Light source 12: Light projecting lens 20: Light receiving unit 30: Light receiving lens 31: Incident surface 32: First reflecting surface 33: Second reflecting surface 33: Third reflecting surface 35: Light condensing surface 40: Light receiving sensor 50: Recessed portion 51: Notch

Claims (6)

A light projecting unit provided with a light source that emits light and a light projecting lens that converts the light emitted from the light source into parallel light;
An incident surface on which parallel light is incident, a first reflecting surface comprising a paraboloid capable of collecting the parallel light incident on the incident surface at one point, and the first reflecting surface between the first reflecting surface and the one point. A second reflecting surface composed of a hyperboloid that is incident on the light reflected by one reflecting surface and can be collected at another point different from the one point; and between the second reflecting surface and the other point. The light reflected by the second reflecting surface is incident, and the other one point is formed by a light receiving lens having a third reflecting surface composed of a plane that reverses the other one point to the second reflecting surface side and the third reflecting surface. A light receiving unit provided with a light receiving sensor provided at a position where the light is reflected and detecting light reflected by the third reflecting surface;
Optical unit equipped with.   The optical unit according to claim 1, wherein the first reflection surface and the second reflection surface are reflection surfaces that perform total reflection.   3. The optical unit according to claim 1, wherein the third reflecting surface is formed in a concave portion provided on an end surface on the incident surface side of the light receiving lens. The light projecting unit is provided on the back side of the first reflecting surface of the light receiving lens,
4. The optical unit according to claim 1, wherein the light receiving lens includes a cutout portion that allows light from the light projecting portion to pass through a part of the first reflecting surface. 5.   5. The light receiving lens according to claim 1, wherein a condensing surface that collects the light inverted by the third reflecting surface on the detection surface of the light receiving sensor is provided between the third reflecting surface and the light receiving sensor. The optical unit as described in any one. The optical unit according to any one of claims 1 to 5,
Conversion that scans the light from the light projecting unit over a predetermined range and converts the reflected light reflected by an object existing in the predetermined range into a direction orthogonal to the incident surface. And
Ranging sensor equipped with.

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