JP6091464B2 - Light emitting / receiving device, distance measuring device - Google Patents

Description

  The present invention relates to a light projecting / receiving device such as a distance measuring device that optically measures a distance using a light projecting device and a light receiving device.

  Light is projected from the light projecting element such as a laser diode to the measurement object via the light projecting lens, and the reflected light reflected by the measurement object is received by the light receiving element such as a photodiode via the light receiving lens. An optical distance measuring device that converts an electrical signal and measures the distance to a measurement object based on the electrical signal is known (for example, Patent Document 1).

  In such an apparatus, generally, an optical component including a light projecting lens and a light receiving lens is held by a holding member, and this holding member is housed in a case. In this case, if the holding member is not accurately positioned and fixed with respect to the case, the positional accuracy of the optical component varies, and the measurement accuracy decreases. Therefore, conventionally, a structure has been employed in which the holding member holding the optical component and the case are positioned with each other by a positioning portion such as a concave portion or a convex portion, and then fixed with screws.

  For example, in the optical displacement sensor described in Patent Document 2, a boss portion that protrudes upward is provided on the bottom surface of the case, and a hollow boss portion that fits the boss portion on an optical base (holding member). Is provided. Then, press the hollow boss part on the optical base side into the boss part on the case side, position the optical base with respect to the case, and then screw them together so that the optical base can be accurately fixed to the case. ing.

JP 2003-75534 A JP 2003-4416 A

  In the conventional structure in which the holding member holding the optical component and the case are fixed by screwing, there is a problem in that the mounting of the holding member to the case takes time and assembly workability is poor.

  Accordingly, an object of the present invention is to provide a light projecting / receiving device capable of improving assembly workability while maintaining high positional accuracy of optical components.

  A light projecting / receiving device according to the present invention includes a light projecting lens that projects light toward an object, a light receiving lens that receives light reflected from the object, a holding member that holds the light projecting lens and the light receiving lens, The holding member is accommodated, and a case having an opening provided corresponding to the light projecting lens and the light receiving lens is provided. The case includes an upper case and a lower case coupled to the upper case. The holding member has a first positioning portion for positioning to the upper case, and a first contact portion having elasticity that contacts the lower case. The upper case has a second positioning portion that fits with the first positioning portion, and the lower case has a second contact portion that contacts the first contact portion. Then, after the first positioning part and the second positioning part are fitted and the first contact part is brought into contact with the second contact part, the upper case and the lower case are joined together. The holding member is fixed between the upper case and the lower case in a state where the first contact portion is elastically deformed and receives an upward reaction force from the second contact portion.

  According to such a configuration, the movement of the holding member in the front-rear and left-right directions is restricted by fitting the first positioning portion of the holding member and the second positioning portion of the upper case. Further, when the upper case is mounted on the lower case, the holding member is fixed without rattling between the upper case and the lower case by the reaction force based on the elastic deformation of the first contact portion, and the vertical direction of the holding member Movement is regulated. For this reason, the holding member can be accurately positioned and fixed with respect to the upper and lower cases. Further, the work of fixing the holding member to the upper and lower cases with screws is unnecessary, and the workability of the assembly is improved.

  In the present invention, one of the first positioning part and the second positioning part may be a trapezoidal protrusion, and the other may be a trapezoidal depression into which the protrusion is fitted.

  In the present invention, the first contact portion may include an elastic piece that is elastically deformed by a pressing force that the holding member receives from the upper case, and a groove that is adjacent to the elastic piece. In this case, the elastic piece may be formed with a protruding portion that protrudes toward the second contact portion.

  In the present invention, a recess in which the first contact portion is fitted may be formed in the lower case, and the second contact portion may be a bottom surface of the recess. Then, by fitting the first contact portion into the recess, the first contact portion may be supported by the bottom surface of the recess, and the holding member may be temporarily assembled to the lower case.

  In the present invention, one of the upper case and the lower case is provided with a hook portion for coupling both cases, and the other of the upper case and the lower case is provided with a hole portion for fitting the hook portion. Good. Then, in a state where the upper case and the lower case are coupled, the hook portion may be elastically fitted into the hole portion by a reaction force received by the first contact portion from the second contact portion.

  In addition, a distance measuring device according to the present invention is a device that is attached to a windshield of a vehicle and measures a distance from the vehicle in front, a light projecting lens that projects light toward the vehicle in front, and the vehicle A light receiving lens that receives the light reflected by the light receiving member, a holding member that holds the light projecting lens and the light receiving lens, and a case that houses the holding member and has an opening provided corresponding to the light projecting lens and the light receiving lens. And. The case includes an upper case attached to the windshield and a lower case coupled to the upper case. The holding member has a first positioning portion for positioning to the upper case, and a first contact portion having elasticity that contacts the lower case. The upper case has a second positioning portion that fits with the first positioning portion, and the lower case has a second contact portion that contacts the first contact portion. Then, after the first positioning part and the second positioning part are fitted and the first contact part is brought into contact with the second contact part, the upper case and the lower case are joined together. The holding member is fixed between the upper case and the lower case in a state where the first contact portion is elastically deformed and receives an upward reaction force from the second contact portion.

  According to such a configuration, since the holding member including the optical component is accurately positioned in the upper case, the light can be accurately projected from the light projecting lens to the predetermined detection area set in front of the vehicle. Can do. Further, the reflected light from the detection region can be received with high accuracy by the light receiving lens. Furthermore, even if the upper case is fixed to the windshield, the holding member can be easily taken out together with the optical components by simply removing the lower case.

  In the distance measuring device of the present invention, the opening may be formed in the upper case.

  According to the present invention, it is possible to provide a light projecting / receiving device capable of improving assembly workability while maintaining high positional accuracy of optical components.

It is a disassembled perspective view which shows the distance measuring device which concerns on embodiment of this invention. It is a perspective view which shows the state which temporarily attached the holding member to the lower case. It is a perspective view which shows the state which mounted | wore the lower case with the upper case. It is a front view of a holding member. It is a left view of a holding member. It is a right view of a holding member. It is a top view of a distance measuring device. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a figure explaining the measurement of the distance to the vehicle ahead. It is a side view which shows the assembly procedure of a distance measuring device. It is a side view which shows the assembly procedure of a distance measuring device. It is a side view which shows the assembly procedure of a distance measuring device. It is a side view which shows the assembly procedure of a distance measuring device. It is a disassembled perspective view which shows the distance measuring device which concerns on other embodiment of this invention. FIG. 16 is an assembly diagram of the distance measuring device of FIG. 15. It is the perspective view which looked at the holding member from diagonally backward. It is a figure which shows the other example of an elastic part. It is a figure which shows the other example of an elastic part. It is a figure which shows the other example of an elastic part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. Below, the case where this invention is applied to the distance measuring device with which a vehicle is equipped is mentioned as an example.

  First, the configuration of the distance measuring apparatus according to the present embodiment will be described with reference to FIGS.

  In FIG. 1, the distance measuring device 100 includes an upper case 1, a lower case 2 coupled to the upper case 1, and a holding member 3 accommodated in both cases 1 and 2. Each of these parts is formed from a synthetic resin. The arrow X represents the left-right direction, L is the left direction, and R is the right direction. The arrow Y represents the front-rear direction, F is the front direction, and B is the rear direction. The arrow Z represents the up-down direction, U is upward and D is downward.

  The upper case 1 includes a flat upper wall 10, an upper wall 11 that is continuous forward with the upper wall 10, and side walls 12 (shown only on the left side) provided on the left and right sides of the upper walls 10 and 11. And a front wall 13 provided at the front end of the upper wall 11. As shown in FIG. 8, a trapezoidal depression 10 a is formed on the back side of the upper wall 10. A trapezoidal protrusion 35 of the holding member 3 to be described later is fitted into the recess 10a. The upper wall 11 is provided with two recesses 17a and 17b. An opening 14 is formed in the recess 17a, and an opening 15 is formed in the recess 17b. The side wall 12 and the front wall 13 are provided with a total of four holes 18 (only three are shown). The hole 18 may be a through hole or a non-through hole. A part of the side wall 12 is notched and a notch 16 is formed. The notch 16 is provided with small recesses 16a and 16b.

  The lower case 2 includes a bottom wall 20, side walls 21 provided on the left and right sides of the bottom wall 20, a rear wall 22 provided at the rear end of the bottom wall 20, and a front provided at the front end of the bottom wall 20. Wall 23. In the side wall 21, a recess 25 is formed, and small protrusions 21 a and 21 b are formed at locations corresponding to the recesses 16 a and 16 b of the upper case 1. Further, the side wall 21 and the front wall 23 are provided with a total of four hook portions 24 (only three are shown) at locations corresponding to the holes 18 of the upper case 1.

  The holding member 3 includes a light projecting lens holding unit 30 that holds the light projecting lens 4, light receiving lens holding units 32 and 33 that hold the light receiving lenses 5 and 6, and side walls 34 provided at left and right ends. ing. The light receiving lens 5 is a light receiving lens used for distance measurement, and the light receiving lens 6 is a light receiving lens used for raindrop detection. The light receiving lens 6 may not be provided. The holding member 3 further includes a light projecting element storage unit 31 that stores the laser diode 7 that is a light projecting element, and light receiving element storage units 36 and 37 that store photodiodes (not shown) that are light receiving elements. Yes. The light receiving element storage portion 36 is provided behind the light receiving lens 5, and the light receiving element storage portion 37 is provided behind the light receiving lens 6. A front view of the holding member 3 is shown in FIG. 4, a left side view is shown in FIG. 5, and a right side view is shown in FIG.

  A trapezoidal protrusion 35 is provided on the upper portion of the side wall 34 of the holding member 3. The side wall 34 is integrally formed with an arm portion 34a extending in the rear direction (B direction). The arm portion 34a includes a claw 34b that is hooked to a circuit board 40 described later at the tip. Further, the side wall 34 is integrally formed with a tongue-like elastic portion 38 extending downward (D direction). The elastic part 38 has an elastic piece 38a and a groove part 38b. The elastic part 38 will be described in detail later.

  A circuit board 40 is mounted on the back surface of the holding member 3. The light emitting element (laser diode 7) and the light receiving element (photodiode) described above are mounted on the circuit board 40, and the drive circuit for the light projecting element 7 and the output circuit for the light receiving element are also mounted. (Not shown).

  FIG. 2 shows a state in which the holding member 3 to which the lenses 4 to 6 and the circuit board 40 are attached is temporarily attached to the lower case 2. At this time, the elastic portion 38 of the holding member 3 is fitted into the concave portion 25 of the lower case 2 and supported by the bottom surface of the concave portion 25.

  FIG. 3 shows a state in which the upper case 1 is attached to the lower case 2 after the holding member 3 is temporarily assembled to the lower case 2 as shown in FIG. The upper case 1 is fixed to the lower case 2 by fitting the hole 18 of the upper case 1 to the hook portion 24 of the lower case 2. As can be seen from FIG. 3, the openings 14 and 15 of the upper case 1 are provided corresponding to the light receiving lenses 5 and 6 and the light projecting lens 4, respectively, and the light receiving lenses 5 and 6 are provided in the opening 14. The projection lens 4 is exposed through the opening 15. 7 is a top view of the distance measuring device 100 of FIG. 3, FIG. 8 is a cross-sectional view taken along line AA of FIG. 7, and FIG. 9 is a cross-sectional view taken along line BB of FIG.

  In the above configuration, the trapezoidal protrusion 35 of the holding member 3 is an example of the “first positioning portion” in the present invention. The trapezoidal depression 10a (FIG. 8) of the upper case 1 is an example of the “second positioning portion” in the present invention. The elastic portion 38 of the holding member 3 is an example of the “first contact portion” in the present invention. The bottom surface (details will be described later) of the recess 25 of the lower case 2 is an example of the “second contact portion” in the present invention. The distance measuring device 100 is an example of the “light emitting / receiving device” in the present invention.

  As shown in FIG. 10, the distance measuring device 100 described above is attached to a windshield W of a vehicle and used as a device for measuring the distance from the vehicle 50 ahead. Specifically, laser light is projected from the light projecting element (laser diode 7) provided in the distance measuring device 100 toward the vehicle 50 ahead via the light projecting lens 4. Then, the reflected light reflected by the vehicle 50 is received by a light receiving element (photodiode) via the light receiving lens 5 and converted into an electric signal, and the distance to the vehicle 50 is measured based on the electric signal. If the measured distance is less than the predetermined value, processing such as automatically operating a brake is performed to prevent a rear-end collision.

  Next, a procedure for assembling the distance measuring apparatus 100 will be described with reference to FIGS.

  First, as shown in FIG. 11A, the holding member 3 to which the lenses 4 to 6 (only the light projecting lens 4 is shown) and the circuit board 40 are attached has the elastic portion 38 directly above the concave portion 25 of the lower case 2. It is located above the lower case 2 so as to come. FIG.11 (b) is an enlarged view of the a part enclosed with the dashed-dotted line in Fig.11 (a). The concave portion 25 of the lower case 2 has a pair of side surfaces 25a and a bottom surface 25b, and is formed in a size that can accommodate the elastic portion 38 of the holding member 3. Specifically, the width of the concave portion 25 in the Y direction is slightly larger than the width of the elastic portion 38 in the Y direction, and the depth of the concave portion 25 in the Z direction is substantially the same as the height of the elastic portion 38 in the Z direction. ing. The elastic portion 38 is formed with an elastic piece 38a that can be elastically deformed in the Z direction, and a U-shaped groove portion 38b adjacent to the elastic piece 38a. The elastic piece 38 a is formed with a protruding portion 38 c that protrudes toward the bottom surface 25 b of the concave portion 25.

  Next, as shown in FIG. 12A, the holding member 3 is lowered downward (D direction), and the elastic portion 38 is accommodated in the concave portion 25 of the lower case 2. At this time, as shown in FIG. 12B, the holding member 3 is attached to the side wall of the lower case 2 by the protrusion 38 c of the elastic piece 38 a contacting the bottom surface 25 b of the recess 25 (line contact or point contact). 22 is supported. This is a state in which the holding member 3 is temporarily assembled to the lower case 2 shown in FIG. In this state, the elastic piece 38a has not been elastically deformed yet.

  Next, as shown in FIG. 13A, the upper case 1 is attached to the lower case 2. In this case, first, the hole 18 of the front wall 13 of the upper case 1 shown in FIG. 1 is fitted into the hook portion 24 of the front wall 23 of the lower case 2. Thereafter, as shown in FIG. 14A, the hole portion 18 of the side wall 12 of the upper case 1 is fitted into the hook portion 24 of the side wall 21 of the lower case 2. As a result, the upper case 1 and the lower case 2 shown in FIG. 3 are connected. Note that, by connecting the upper and lower cases 1 and 2, the convex portions 21 a and 21 b of the lower case 2 are fitted into the concave portions 16 a and 16 b of the upper case 1.

  In this state, as shown in FIG. 8, the trapezoidal protrusion 35 of the holding member 3 is fitted in the trapezoidal depression 10 a of the upper case 1, and therefore the movement of the holding member 3 in the Y direction (front-rear direction). Is regulated. Moreover, as shown in FIG. 9, the movement of the holding member 3 in the X direction (left-right direction) is also restricted by fitting the protrusions 35 and the recesses 10a. That is, the holding member 3 is positioned in the front-rear and left-right directions with respect to the upper case 1.

  Further, when the upper case 1 is attached to the lower case 2, the holding member 3 is pressed downward (D direction) by the upper case 1. Therefore, as shown in FIG. 14B, the elastic piece 38a of the elastic portion 38 is elastically deformed in the Z direction by the pressing force of the upper case 1 in a state where the protruding portion 38c is in contact with the bottom surface 25b of the concave portion 25. To do. As a result, an upward (U direction) reaction force f acts on the holding member 3 including the elastic portion 38 from the bottom surface 25 b of the recess 25. Since the reaction force f acts in a direction to separate the upper case 1 from the lower case 2, the hook portion 24 of the lower case 2 is elastically fitted to the hole portion 18 of the upper case 1. As a result, the upper case 1 and the lower case 2 are joined without rattling. The holding member 3 is also fixed between the cases 1 and 2 in a state in which rattling is prevented by the reaction force f, and movement in the Z direction (up and down direction) is restricted.

  According to the above-described embodiment, the trapezoidal protrusion 35 of the holding member 3 and the trapezoidal depression 10a of the upper case 1 are fitted to each other, so that the X direction (left and right direction) and Y direction ( The movement in the front-rear direction can be restricted. Further, when the upper case 1 is mounted on the lower case 2, the holding member 3 is fixed without rattling between the upper case 1 and the lower case 2 by the reaction force f based on the elastic deformation of the elastic piece 38a. Therefore, the movement of the holding member 3 in the Z direction (vertical direction) can be restricted. From the above, the holding member 3 can be accurately positioned and fixed in the front / rear, left / right, and upper / lower directions with respect to the upper and lower cases 1 and 2, and the lenses 4 to 6 attached to the holding member 3. It is possible to perform highly accurate distance measurement while suppressing variations in position accuracy of the optical components.

  In particular, in the distance measuring device 100 that measures the distance from the vehicle 50 ahead as shown in FIG. 10, the upper case 1 is fixed to the windshield W. It is necessary to accurately position the case 1. By accurately positioning the holding member 3 on the upper case 1, it is possible to project the laser light with high accuracy from the light projecting lens 4 to a predetermined detection area set in front of the vehicle. The reflected light from the light can be received by the light receiving lens 5 with high accuracy. Further, in the present embodiment, even if the upper case 1 is fixed to the windshield W, the holding member 3 is not fixed to the upper case 1, so that the holding member 3 can be attached together with the optical components simply by removing the lower case 2. Easy to take out. Thereby, maintenance and replacement work of optical parts can be easily performed.

  Further, according to the above-described embodiment, after the elastic portion 38 of the holding member 3 is accommodated in the recess 25 of the lower case 2 and the holding member 3 is temporarily assembled to the lower case 2, The holding member 3 can be accurately positioned and fixed simply by fitting the hook portion 24 of the lower case 2. For this reason, the operation | work which fixes the holding member 3 to the upper and lower cases 1 and 2 with a screw | thread becomes unnecessary, and the workability | operativity of an assembly improves.

  Further, according to the above-described embodiment, a circuit in which a light projecting element (laser diode) and a light receiving element (photodiode) are mounted on the back surface of the holding member 3 to which the light projecting lens 4 and the light receiving lenses 5 and 6 are attached. A substrate 40 is mounted. For this reason, the positional relationship between the light projecting element and the light projecting lens 4 and the positional relationship between the light receiving element and the light receiving lenses 5 and 6 are defined by the holding member 3, and the positional accuracy thereof is ensured. be able to.

  Further, according to the above-described embodiment, the trapezoidal protrusion 35 and the trapezoidal depression 10a are provided as means for positioning the holding member 3 on the upper case 1, so that the protrusion 35 has a trapezoidal slope as a guide surface. And the recess 10a can be easily fitted.

  Furthermore, according to the above-described embodiment, since the protruding portion 38c is formed on the elastic piece 38a of the elastic portion 38, the protruding portion 38c contacts the bottom surface 25b of the recess 25 as shown in FIG. In this state, the elastic piece 38a can be easily elastically deformed with the protruding portion 38c as a fulcrum.

  FIG. 15 shows a distance measuring device 200 according to another embodiment of the present invention. In the distance measuring device 200, a circuit board 41 other than the circuit board 40 is connected to the holding member 3. Since the other configuration is the same as that of the embodiment of FIG. FIG. 16 is an assembly diagram of the distance measuring device 200, but the external appearance is the same as the distance measuring device 100 of FIG.

  The circuit board 41 projects in front of the holding member 3 (F direction) and is electrically connected to the circuit board 40 by a flat cable 42 as shown in FIG. The circuit board 41 is positioned on the lower case 2 by appropriate means. The circuit board 41 may be mounted with, for example, a small camera for taking an image in front of the vehicle, a driving circuit for the camera, or the like. In that case, the upper case 1 is provided with an opening (not shown) corresponding to the lens of the camera.

  In the present invention, the following various embodiments can be adopted in addition to the embodiments described above.

  In the above embodiment, the elastic portion 38 having the U-shaped groove portion 38b has been described as an example, but instead, an elastic portion as shown in FIGS. 18 to 20 may be employed. The elastic part 48 in FIG. 18 has a pair of elastic pieces 48a in which a protruding part 48c is formed, and a rectangular groove part 48b adjacent thereto. The elastic part 58 of FIG. 19 has a cantilever-like elastic piece 58a in which a protruding part 58c is formed, and a horizontally elongated groove part 58b adjacent thereto. The elastic part 68 in FIG. 20 has a pair of elastic pieces 68a extending vertically and a vertically long groove part 68b formed between them. Moreover, the recessed part 70 in which the elastic part 68 is accommodated is formed in the inverted trapezoid shape. When the elastic portion 68 is inserted into the concave portion 70 from above, the elastic piece 68a abuts on the side surface 70a of the concave portion 70 and then elastically deforms inward.

  In the above embodiment, the upper case 1 is provided with the trapezoidal depression 10a and the holding member 3 is provided with the trapezoidal protrusion 35. On the contrary, the upper case 1 is provided with the trapezoidal protrusion and the holding member 3 is provided. 3 may be provided with a trapezoidal depression. Further, the shape of the protrusion 35 and the recess 10a may be a shape other than the trapezoid.

  In the above embodiment, the hole 18 is provided in the upper case 1 and the hook portion 24 is provided in the lower case 2. On the contrary, the hook portion is provided in the upper case 1 and the hole is provided in the lower case 2. May be.

  In the above embodiment, the vehicle distance measuring devices 100 and 200 that measure the distance from the vehicle 50 ahead are described as examples. However, the distance measuring device of the present invention measures the distance to an object other than the vehicle. It can also be used in some cases. Further, the light projecting / receiving device of the present invention is not limited to a device for measuring a distance, but can be applied to a device for detecting the presence or absence of an object, a device for detecting the position of an object, and the like.

DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Holding member 4 Light projection lens 5 Light receiving lens 6 Light receiving lens 10a Trapezoidal hollow (2nd positioning part)
18 hole part 24 hook part 25 recessed part 25b bottom face (2nd contact part)
35 Trapezoidal projection (first positioning part)
38, 48, 58, 68 Elastic part (first contact part)
38a, 48a, 58a, 68a Elastic pieces 38b, 48b, 58b, 68b Grooves 38c, 48c, 58c Protruding part 50 Vehicle 100, 200 Distance measuring device (light emitting / receiving device)
f Reaction force W Windshield

Claims (8)

A light projection lens that projects light toward the object;
A light-receiving lens that receives light reflected by the object;
A holding member for holding the light projecting lens and the light receiving lens;
A case having an opening provided to accommodate the holding member and corresponding to the light projecting lens and the light receiving lens;
In a light emitting and receiving device equipped with
The case includes an upper case and a lower case coupled to the upper case,
The holding member has a first positioning portion for positioning to the upper case, and a first contact portion having elasticity that contacts the lower case,
The upper case has a second positioning portion that fits with the first positioning portion,
The lower case has a second contact portion that contacts the first contact portion,
After fitting the first positioning portion and the second positioning portion and bringing the first contact portion into contact with the second contact portion, the upper case and the lower case are joined. Sometimes, the holding member is fixed between the upper case and the lower case in a state where the first contact portion is elastically deformed and receives an upward reaction force from the second contact portion. A light emitting / receiving device characterized by The light projecting / receiving device according to claim 1,
One of the first positioning part and the second positioning part is a trapezoidal protrusion, and the other is a trapezoidal depression into which the protrusion is fitted. In the light projecting / receiving device according to claim 1 or 2,
The first contact portion includes an elastic piece that is elastically deformed by a pressing force that the holding member receives from the upper case, and a groove portion that is adjacent to the elastic piece. In the light projecting / receiving device according to claim 3,
A protrusion that protrudes toward the second contact portion is formed on the elastic piece.
The light projecting / receiving device, wherein the protruding portion is in contact with the second contact portion. The light projecting / receiving device according to any one of claims 1 to 4,
The lower case is formed with a recess into which the first contact portion is fitted,
The second contact portion is a bottom surface of the concave portion;
By fitting the first contact portion into the recess, the first contact portion is supported by the bottom surface of the recess, and the holding member is temporarily assembled to the lower case. Light receiving device. The light projecting / receiving device according to any one of claims 1 to 5,
One of the upper case and the lower case is provided with a hook portion for connecting both cases,
The other of the upper case and the lower case is provided with a hole portion into which the hook portion is fitted,
In a state where the upper case and the lower case are coupled, the hook portion is elastically fitted into the hole portion by the reaction force received by the first contact portion from the second contact portion. Characteristic light emitting / receiving device A distance measuring device that is attached to a windshield of a vehicle and measures a distance from a vehicle in front of the vehicle,
A projection lens that projects light toward the vehicle ahead,
A light receiving lens for receiving light reflected by the vehicle;
A holding member for holding the light projecting lens and the light receiving lens;
A case that houses the holding member and has an opening provided corresponding to the light projecting lens and the light receiving lens, and
The case is composed of an upper case attached to the windshield and a lower case coupled to the upper case,
The holding member has a first positioning portion for positioning to the upper case, and a first contact portion having elasticity that contacts the lower case,
The upper case has a second positioning portion that fits with the first positioning portion,
The lower case has a second contact portion that contacts the first contact portion,
After fitting the first positioning portion and the second positioning portion and bringing the first contact portion into contact with the second contact portion, the upper case and the lower case are joined. Sometimes, the holding member is fixed between the upper case and the lower case in a state where the first contact portion is elastically deformed and receives an upward reaction force from the second contact portion. A distance measuring device characterized by. The distance measuring device according to claim 7,
The distance measuring device, wherein the opening is formed in the upper case.

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