JPH0942953A - Optical displacement sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical displacement sensor capable of coping with the case that the position of a lens on the light receiving side inserted into a lens insertion section is positioned by a butt face with no adjustment and the case that the position can be adjusted in the longitudinal direction of the butt face. SOLUTION: A lens with a flange section 3a is used for a lens 3 on the light receiving side, and a removable projection 20 is protruded on the outer face of the flange section 3a. A lens position adjusting groove 23 insertable with the projection 20 is recessed on a lens insertion section 6 of an optical base 4, and a depth section of the groove 23 is used as a butt face 22 with the projection 20 of the flange section 3a. The unadjusted state that the lens 3 is positioned by the butt face 22 and the state that the position of the lens 3 is adjusted in the longitudinal direction A of the butt face 22 while the projection 20 is removed from the flange section 3a can be selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical displacement sensor for optically detecting a distance to a detection target by a triangulation method, for example.

[0002]

2. Description of the Related Art Conventionally, as an optical displacement sensor of a triangulation type, for example, as shown in FIG.
From the detection object 52 arranged on the light projecting axis 51, and the reflected light from the detection object 52 arranged on the light projecting axis 51 is received on the light receiving axis 53. It is known that an image is formed on the light receiving element 13 via the lens 3 for use. In FIG. 8, Δγ indicates the displacement of the detection object 52,
Δx corresponds to the displacement Δγ of the detection object 52 and the light receiving element 13
The above shows the range in which the movement of the light spot occurs, and θ represents the tilt angle (light receiving angle) of the lens 3 with respect to the projection axis 51.

Here, the light-transmitting side and the light-receiving lenses 2, 3
Is fixed to the optical base 4 shown in FIG. The optical base 4 is formed with two circular lens insertion portions 5 and 6'so that the light emitting and receiving shafts 51 and 53 intersect at the front position.
The lens 2 (FIG. 8) is inserted in the lens insertion portion 5 for projecting light, and the lens 3 is inserted and fixed in the lens insertion portion 6'for receiving light. Then, as shown in FIG. 9B, an abutting surface 22 is formed on the light receiving lens insertion portion 6 ′, and the lens 3 is abutted with the adhesive 55 while the lens 3 is abutting on the abutting surface 22. It can be fixed or the lens insertion part 6'as shown in FIG. 9 (c).
The holder 57 is screwed into the thread groove 56 formed on the inner surface of the
The holder 57 presses and fixes the lens 3 against the abutting surface 22. In each case, the abutting method is employed in which the lens 3 is abutted and positioned on the abutting surface 22 of the lens insertion portion 6 '.

[0004]

In the above-described conventional abutting system, the lens 3 can be fixed without adjusting the position of the lens 3, which has an advantage that the number of assembling steps of the lens 3 can be reduced. However, in the following cases, it is absolutely necessary to adjust the position of the lens 3 (or 2). When the processing accuracy of the abutting surface 22 is not sufficient, or when adjustment is required with a precision smaller than the accuracy of the abutting surface 22, or when using the same optical system to create different distance measuring ranges, focus There are cases where the positions are different in the respective measurement ranges, and because the wavelength of the light used in the same optical system is changed, the focal length of the lens 3 changes and lens adjustment becomes necessary. However, in the conventional butting method, the butting surface 2
The position of the lens 3 may be adjusted so that the lens 3 does not hit the abutting surface 22 in front of 2.
The abutting surface 22 is an obstacle behind the abutting surface 22 and the lens 3 cannot be moved.
In order to adjust the lens, it is necessary to change the position of the abutting surface 22, and it is not possible to adjust the position of the lens 3 with fine accuracy, and there is a problem that the number of assembling steps increases.

The present invention has been made in view of the above conventional problems, and an object thereof is to position the lens inserted in the lens insertion portion without adjustment by the abutting surface. Another object of the present invention is to provide an optical displacement sensor capable of coping with both cases where adjustment can be made in the front-back direction of the contact surface.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 contemplates a lens 2 for projecting light, which focuses the light from the light projecting element 9 and projects it along the projection axis. And the light receiving element 1 at the rear by receiving the reflected light from the detection object on the projection axis and the like.
3, a light-receiving lens 3 for forming an image of light on each of the lenses 3, and each lens 2,
In an optical displacement sensor having an optical base 4 having a lens insertion portion 6 for inserting and positioning and fixing 3 therein, at least one of the light projecting lens 3 and the light receiving lens 3 is configured by a lens 3 with a flange portion 3a. Abutment surface 2 on the lens insertion portion 6 of the base 4 and the flange portion 3a of the lens 3
2 and the lens 3 is positioned by the abutting surface 22 in an unadjusted state, and the abutting surface 2 avoiding the abutting surface 22.
It is characterized in that the position of the lens 3 can be adjusted in the front-back direction A of 2 and the flange portion 3a of the lens 3 is abutted against the abutting surface 22 of the lens insertion portion 6 by such a configuration. It is possible to cope with both the non-adjustment state in which the position is adjusted by and the state in which the position of the lens 3 can be adjusted in the front-back direction A of the contact surface 22 while avoiding the contact surface 22.

A detachable projection 20 is provided on the outer surface of the flange portion 3a of the lens 3 and a lens position adjusting groove 2 into which the projection 20 can be inserted is formed on the inner surface of the lens insertion portion 6.
3 is provided as a recess, and the projections 20 of the groove 23 and the flange 3a are provided.
As the abutting surface 22, and the projection 20 as the flange portion 3
It is preferable to be able to adjust the position of the lens 3 in the front-rear direction A of the abutting surface 22 in the state of being removed from a. With this configuration, when the lens adjustment is not necessary, the projection 20 of the flange portion 3a The lens 3 can be positioned at a required position by inserting the lens into the groove 23 of the lens insertion portion 6 and abutting it. On the other hand, when lens adjustment is required, the projection 20 is removed from the flange portion 3a by cutting or the like to remove the lens. By inserting 3, the protrusion is eliminated from the flange portion 3a, and the adjustment and adjustment of the lens 3 in the front-back direction A of the abutting surface 22 can be performed without any trouble.

Further, a protrusion 20 is provided on the outer surface of the flange portion 3a of the lens 3 so that the protrusion 20 can be inserted into two portions of the inner surface of the lens insertion portion 6 in the circumferential direction B and the entrance of the lens insertion portion 6 can be inserted. Two lens position adjusting grooves 23 and 24 having different depths when viewed from the side are formed, and the inner part of the shallower groove 23 and the projection 20 of the flange 3a serve as an abutting surface 22, and the deeper part It is preferable that the position of the lens 3 can be adjusted in the front-rear direction A of the abutting surface 22 with the projection 20 of the flange portion 3a facing the groove 24. With this configuration, lens adjustment is not necessary. In this case, the lens 3 can be positioned at a required position simply by inserting the projection 20 of the flange portion 3a into the shallow groove 23 and abutting it, while
When lens adjustment is required, the protrusion 20 of the flange portion 3a is inserted into the deep groove 24, so that the lens 3 can be adjusted and adjusted in the front-back direction A of the abutting surface 22 without cutting the protrusion 20. .

Further, concave and convex portions 31 and 32 having different depths when viewed from the rear end surface of the flange portion 3a are formed on the rear end surface of the flange portion 3a of the lens 3, and the lens insertion portion 6 has an inner surface for adjusting the lens position. The protrusion 20 is provided so that the protrusion 32 and the protrusion 20 of the flange portion 3a serve as an abutment surface 22, and the recess 31 of the flange portion 3a faces the protrusion 20 of the lens insertion portion 6 and is abutted. It is preferable to be able to adjust the position of the lens 3 in the front-back direction A of the surface 22. With such a configuration, when the lens adjustment is not necessary, the convex portion 32 of the flange portion 3a is made to protrude from the lens insertion portion 6. The lens 3 can be positioned at a required position simply by inserting the lens 3 so that it abuts the lens 20. On the other hand, when lens adjustment is required, align the concave portion 31 of the flange portion 3a with the protrusion 20 of the lens insertion portion 6. By inserting the lens 3 as, without adding any hand lens 3, it is the position adjustment of the lens 3 in the longitudinal direction A of the abutting surface 22.

Further, two grooves 25 and 26 having different depths when viewed from the rear end surface of the flange portion 3a are formed at two positions in the circumferential direction B of the rear end surface of the flange portion 3a of the lens 3, and the lens insertion portion 6 is formed. A protrusion 21 for adjusting the lens position that can be inserted into one of the two grooves 25, 26 is provided on the inner surface of the protrusion of the flange portion 3a in the shallow groove 25 and the protrusion 2 of the lens insertion portion 6.
1 as an abutting surface 22 and the deeper groove 26 facing the protrusion 21 of the lens insertion portion 6
It is preferable to be able to adjust the position of the lens 3 in the front-back direction A of 2. By configuring in this way, when lens adjustment is not required, the lens insertion portion 6 is inserted into the shallow groove 25 of the flange portion 3a. Lens 3 so that it abuts protrusion 21
The lens 3 can be positioned at a required position simply by inserting the lens. On the other hand, when lens adjustment is required, the deep groove 26 of the flange portion 3a is aligned with the protrusion 21 of the lens insertion portion 6 By inserting 3, the position of the lens 3 can be adjusted in the front-back direction A of the abutting surface 22 without touching the lens 3.

Further, a flat surface 35 is formed on the rear end surface of the flange portion 3a of the lens 3 along the circumferential direction B of the flange portion 3a.
And an inclined surface 36 inclined in the front-rear direction A of the flat surface 35 are respectively formed, and a projection 21 for adjusting the lens position is provided on the inner surface of the lens insertion portion 6, and the flat surface 35 of the flange portion 3a is formed. And the projection 21 as an abutting surface 22, the lens 3 is rotatable in the circumferential direction B, and the flange portion 3a
The lens 3 is rotated in the circumferential direction B while the slanted surface 36 of the lens is abutted against the protrusion 21 of the lens insertion portion 6,
It is preferable that the position of the lens 3 can be adjusted in the front-rear direction A of 2. By such a configuration, when the lens adjustment is not necessary, the projection 21 of the lens insertion portion 6 is formed on the flat surface 35 of the flange portion 3a. The lens 3 can be positioned at a required position simply by abutting it on the other hand. On the other hand, when lens adjustment is required, the lens insertion portion is formed on the inclined surface 36 inclined in the front-rear direction A of the flat surface 35 of the flange portion 3a. The position of the lens 3 can be adjusted in the front-rear direction A of the abutting surface 22 and the fine adjustment in the front-rear direction A of the lens 3 is easy by simply contacting the protrusion 21 of 6 and rotating the lens 3 in the circumferential direction B. Therefore, the position can be adjusted more precisely.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an example of an embodiment of the present invention, a distance measuring optical displacement sensor 1 for optically and accurately measuring a distance to a detection target by a triangulation method will be exemplified. As shown in FIG. 2, the distance-measuring optical displacement sensor 1 includes an optical base 4 that supports light-projecting and light-receiving lenses 2 and 3. 2 along the optical path of the projection / reception axis that intersects at the front position
Two circular lens insertion portions 5 and 6 are provided, and a light projecting lens 2 such as a SELFOX lens is fixed inside the lens insertion portion 5 on the projection axis side. Behind the lens 2 for projecting light, a projecting element 9 such as a semiconductor laser, a leaf spring 10 and a flexible circuit board 11 connected to the projecting element 9 are arranged. This flexible circuit board 11 is a circuit board 12.
It is connected to an upper drive circuit (not shown), and the drive circuit drives the light projecting element 9 so that the light from the light projecting element 9 is focused into a parallel beam through the lens 2 and directed to the projecting axis. To irradiate. On the other hand, the light receiving lens 3 for receiving the reflected light (or the transmitted light) from the detection object is fixed to the lens insertion portion 6 on the light receiving axis side at a position separated from the light projecting lens 2 by a predetermined distance. . As will be described later, the lens 3 is inserted and fixed in the lens insertion portion 6 in a positionally adjustable manner, and a position detecting element (PSD; position sensitive device) which is a light receiving element 13 is fixed behind the lens 3. There is. This position detecting element is provided with different electric power outputs at both ends based on the light receiving position, and the circuit board 1 is provided via the flexible circuit board 14.
It is connected to an I / V conversion circuit, an arithmetic circuit, etc. (not shown) mounted on the second unit. Then, when the detection object blocks the light beam, the reflected light is imaged on the light receiving element 13 (position detection element) via the lens 3 and the position up to the detection object is detected. FIG. 3 shows a case 15 of the optical displacement sensor 1 for distance measurement. In the figure, 16 is a light emitting side filter, 17 is a light receiving side filter, and 18 is a cable.

Here, the lens 3 for receiving light is as shown in FIG.
As shown in (c), it is composed of a lens 3 with a flange portion 3a in which a flange portion 3a is integrally provided on the outer peripheral surface, and at one location on the outer surface of this flange portion 3a, as shown in FIGS. Also, the projection 20 for adjusting the lens position is provided with the flange portion 3a.
Is provided so as to project radially outward. The protrusion 20 is formed in a thin shape that can be removed from the flange portion 3a by cutting or the like, and by removing the protrusion 20 from the flange portion 3a, the position of the lens 3 can be adjusted in the front-back direction (adjustment direction) A of the abutting surface 22. It is like this.

On the other hand, a lens position adjusting groove 23 into which the projection 20 can be inserted is provided at one location on the inner surface of the lens insertion portion 6 on the light receiving axis side of the optical base 4. This groove 23
Has one end open to the entrance side of the lens insertion portion 6 and the other end side extending in the front-rear direction A to a substantially intermediate position of the lens insertion portion 6. The rear end of this groove 23 is the protrusion 20 of the flange portion 3a.
And the abutting surface 22 with.

Further, as shown in FIG. 1A, the optical base 4 is provided with a substantially circular pin hole 27 penetrating from the upper portion of the lens insertion portion 6 to the upper surface of the optical base 4. The adjustment pin 28 can be inserted into the hole 27 from the outside of the optical base 4. The tip 28a of the adjusting pin 28 is pointed so as to engage with the engaging hole 3b provided in the outer surface of the flange portion 3a of the lens 3, and the pin hole 27 connects the base end 28b of the adjusting pin 28 to the front-back direction A. The adjustment pin 28 is tilted about the pin hole 27 when it is moved to a position such that the tip 28a of the adjustment pin 28 can be moved in the direction opposite to the base end 28b of the adjustment pin 28. The movement of the lens 3 can be adjusted by the adjusting pin 28 from the outside. Alternatively, the pin hole 27 may be formed in an elongated slot shape in the front-rear direction A, and the adjustment pin 28 may be slid along the elongated hole.

If no lens adjustment is necessary,
As shown in FIG. 1B, the lens 3 is inserted so that the protrusion 20 of the flange portion 3 a is inserted into the groove 23 of the lens insertion portion 6. Then, the projection 20 is attached to the abutting surface 22 at the back of the groove 23.
The lens 3 can be positioned at a required position by abutting against. After that, the lens 3 is fixed to the lens insertion portion 6 by using, for example, a screw or an adhesive, so that the lens 3 can be precisely fixed at a predetermined position. By assembling the protrusion 20 of the lens 3 against the groove 23 of the lens insertion portion 6 in this way, the lens 3 can be assembled without adjustment, and the number of assembling steps can be reduced.

On the other hand, when lens adjustment is required, the projection 20 is removed from the flange 3a by cutting or the like.
This eliminates protrusions on the outer surface of the flange 3a,
By inserting the lens 3 into the lens insertion portion 6, the protrusion 20 does not interfere when adjusting the position of the lens 3 in the front-back direction A of the abutting surface 22. Then, in this state, the adjusting pin 28 is attached to the pin hole 27 from the outside of the optical base 4.
And the tip of the adjusting pin 28 is locked in the locking hole 3b on the outer surface of the flange 3a to move the base end 28b of the adjusting pin 28 in the front-back direction A.
The flange portion 3a can be moved in the front-rear direction A by 8a, and the lens 3 is abutted against the surface 2 from the outside of the optical base 4.
The position can be adjusted in the front-back direction A of 2. The lens 3 may be directly moved by hand instead of using the adjustment pin 28. Moreover, after the lens adjustment, the lens 3 is fixed to the lens insertion portion 6 by using a screw or an adhesive.

As a result, even when lens adjustment is required, it is sufficient to remove the protrusion 20 from the flange portion 3a, so that the number of assembling steps can be reduced, and the positioning by the abutting of the lens 3 and the adjusting pin 28 can be reduced. There is an advantage that both of the position adjustments of the lens 3 can be selected with a fine precision due to the above. Especially, when the lens adjustment is absolutely necessary (for example, when the processing accuracy of the abutting surface 22 is not sufficient or the accuracy of the abutting surface 22 is finer than If you need to make adjustments with precision, or if you use the same optical system to create different distance-measuring ranges, and if the focus positions are different in each measuring range, you can change the wavelength of the light used by the same optical system. Since the change is made, there is an advantage that it can sufficiently cope with the case where the focal length of the lens 3 is changed and the lens adjustment is required.

Another example of the embodiment of the present invention is shown in FIG.
4A and 4B, the flange portion 3a of the lens 3
Two projections 20 are provided on the outer surface of the lens, and the projections 20 can be inserted into two locations on the inner surface of the lens insertion portion 6 in the circumferential direction B and have different depths when viewed from the entrance side of the lens insertion portion 6. The grooves 23 and 24 for position adjustment are formed, and the deep end of the groove 23 on the shallow side serves as an abutting surface 22 with the projection 20 of the flange 3a, and the groove 20 on the deep side forms the projection 20 of the flange 3a. The position of the lens 3 can be adjusted in the front-back direction A of the butting surface 22 in the inserted state. Other configurations and the lens adjusting method using the adjusting pin 28 and the lens fixing method using an adhesive or the like are the same as in the case of FIG. Therefore, when the lens adjustment is not necessary, the flange portion 3a is provided in the shallow groove 23.
The lens 3 can be positioned at a required position only by inserting and abutting the protrusion 20 of the above.
On the other hand, when lens adjustment is required, the deep groove 24
By inserting the protrusion 20 of the flange portion 3a into the abutting surface 22, the abutting surface 22 does not become an obstacle when adjusting the position of the lens 3 in the front-back direction A of the abutting surface 22,
The position can be adjusted in the front-back direction A of 2. Therefore, even when the lens adjustment is required, the adjustment pin 28 enables fine adjustment with a finer precision than the precision of the abutting surface 22, and when adjusting the lens 3, the protrusion 2
Since it is only necessary to insert 0 into the deep groove 24 and it is not necessary to remove the protrusion 20, it is possible to adjust the position without touching the lens 3, and it is possible to reduce the number of assembling steps.

FIG. 5 shows still another example of the embodiment of the present invention. In the figure, uneven portions 31 and 32 having different depths when viewed from the rear end surface of the flange portion 3a are formed in a stepped shape on the rear end surface of the flange portion 3a of the lens 3 to adjust the lens position on the inner surface of the lens insertion portion 6. Projections 20 of the flange portion 3a are provided as the abutting surfaces 22 with the projections 20, and the recessed portions 31 of the flange portion 3a are the projections 2 of the lens insertion portion 6.
0 in the front-back direction A of the abutting surface 22 in the state of facing 0.
The position of the lens 3 can be adjusted by using, and the position of the lens 3 can be adjusted by inserting the adjusting pin 28 from the pin hole 27 formed in the side surface of the optical base 4. Other configurations and the lens adjusting method using the adjusting pin 28 and the lens fixing method using an adhesive or the like are the same as in the case of FIG. Therefore, when the lens adjustment is not required, the lens 3 is inserted so that the convex portion 32 of the flange portion 3a abuts on the protrusion 20 of the lens insertion portion 6 so that the lens 3 can be positioned by itself. Become. On the other hand, when lens adjustment is required, the lens 3 is inserted by inserting the lens 3 so that the concave portion 31 of the flange portion 3a is aligned with the protrusion 20 of the lens insertion portion 6 and the position of the lens 3 in the front-back direction A of the abutting surface 22. Can be adjusted.
Therefore, even when lens adjustment is required, the adjustment pin 2
8 makes it possible to perform fine adjustment with a finer precision than the precision of the abutting surface 22, and further, it is not necessary to provide a protrusion or the like on the flange portion 3a, and when further adjusting the lens 3, the concave portion 31 of the flange portion 3a is required. Since it is only necessary to insert the lens 3 with the projections 20 of the lens insertion portion 6 aligned, it is possible to adjust the position without touching the lens 3, and the number of assembling steps can be reduced.

FIG. 6 shows still another example of the embodiment of the present invention. In the figure, two grooves 25 and 26 having different depths when viewed from the rear end surface of the flange portion 3a are formed at two positions in the circumferential direction B of the rear end surface of the flange portion 3a of the lens 3, and the inner surface of the lens insertion portion 6 is formed. A protrusion 21 for adjusting the lens position that can be inserted into one of the two grooves 25, 26 is provided so that the protrusion 21 of the lens insertion portion 6 abuts against the inner portion of the shallow groove 25 of the flange portion 3a. The abutting surface 22 with the deep groove 26 facing the projection 21 of the lens insertion portion 6
The position of the lens 3 can be adjusted in the front-back direction A.
Other configurations and the lens adjusting method using the adjusting pin 28 and the lens fixing method using an adhesive or the like are the same as in the case of FIG.
Therefore, when lens adjustment is not necessary, the flange portion 3a
By inserting the lens 3 so as to abut the projection 21 of the lens insertion portion 6 in the shallow groove 25, it becomes possible to position the lens 3 at a necessary position. On the other hand, when the lens adjustment is required, the lens 3 is inserted by aligning the deep groove 26 of the flange portion 3a with the protrusion 21 of the lens insertion portion 6 to position the abutting surface 22 in the front-back direction A. Can be adjusted. Therefore, even when lens adjustment is required, the adjustment pin 28 enables fine adjustment with a finer precision than the precision of the abutting surface 22, and it is not necessary to provide a protrusion or the like on the flange portion 3a, and lens adjustment is further performed. In this case, it is only necessary to insert the lens 3 with the projection 21 of the lens insertion portion 6 aligned with the concave portion 31 of the flange portion 3a, and it becomes possible to adjust the position without touching the lens 3. When adjusting the lens 3 with the adjusting pin 28, the lens 3 is prevented from rotating in the circumferential direction B due to the fitting of the projection 21 and the groove 26, so that the lens 3 does not rotate unnecessarily. The position can be adjusted more precisely.

FIG. 7 shows still another example of the embodiment of the present invention. In the figure, a flat surface 35 is formed on the rear end surface of the flange portion 3a of the lens 3 along the circumferential direction B of the flange portion 3a, and an inclined surface 36 inclined in the front-rear direction A of the flat surface 35 is formed. is there. One end of this inclined surface 36 is a flat surface 3
It is a recessed part 36a that is stepped down more than 5
The other end of the inclined surface 36 is a protrusion 36b protruding rearward from the flat surface 35. Further, a projection 21 for adjusting the lens position is provided on the inner surface of the lens insertion portion 6, the flat surface 35 of the flange portion 3a serves as an abutment surface 22 with the projection 21, and the lens 3 rotates in the circumferential direction B. With freedom
The inclined surface 36 of the flange portion 3a is used as the projection 2 of the lens insertion portion 6.
The position of the lens 3 can be adjusted in the front-back direction A of the abutting surface 22 by rotating the lens 3 in the circumferential direction B in the state of being in contact with 1. Further, the pin hole 27 into which the adjustment pin 28 is inserted is formed in the shape of an elongated elongated hole along the left-right direction C orthogonal to the front-back direction A. Other configurations are the same as in the case of FIG. 5, and the lens fixing method using an adhesive or the like is the same as in the case of FIG.

Therefore, when the lens adjustment is not necessary, the lens 3 is inserted by abutting the projection 21 of the lens insertion portion 6 on the flat surface 35 of the flange portion 3a as shown in FIG. 7B. With that alone, it becomes possible to position at the required position. On the other hand, when the lens adjustment is required, the flat surface 3 of the flange portion 3a as shown in FIG.
5, the lens 3 is inserted into the inclined surface 36 inclined in the front-rear direction A so as to align with the protrusion 21 of the lens insertion portion 6, and the adjustment pin 28 is pinned with the inclined surface 36 abutting the protrusion 21. By sliding along the hole 27 and rotating the lens 3 in the circumferential direction B, the protrusion 21 moves on the inclined surface 36 of the flange portion 3a, and accordingly, the rotation of the lens 3 changes in the front-back direction A. Converted and inclined surface 3
When the projection 21 moves to the recess 36a of 6, the lens 3 can be moved to the rearmost side, and when the projection 21 moves to the projection 36b of the inclined surface 36, the lens 3 can be moved to the frontmost side. As a result, abutting surface 2
The position can be adjusted in the front-back direction A of 2. Therefore, even when lens adjustment is required, the number of assembling steps can be reduced, the lens 3 can be changed from the non-adjusted state to the adjusted state without any modification, and the lens 3 can be moved in the circumferential direction B.
By rotating the lens 3 to adjust the position in the front-rear direction A, fine adjustment of the lens 3 in the front-rear direction A becomes easy, and more precise position adjustment can be performed.

In each of the above embodiments, the position adjustment of the light receiving lens 3 has been described, but it goes without saying that the position of the light projecting lens 2 can be adjusted in the same manner as the light receiving lens 3. . In addition, the adjustment pin 2 is used as a lens adjustment means.
However, the number is not limited to 8, and a micrometer head or the like may be used.

[0025]

As described above, according to the first aspect of the present invention, the light projecting lens for focusing the light from the light projecting element and projecting the light along the light projecting axis, and the light projecting lens are provided. A light-receiving lens that receives reflected light from an on-axis detection object and forms an image on a light-receiving element in the rear, and an optical base having a lens insertion portion that inserts the light-receiving lens to position and fix the lens. In the provided optical displacement sensor, at least one of the light projecting lens and the light receiving lens is configured by a lens with a flange portion, and an abutting surface is formed between the lens insertion portion of the optical base and the flange portion of the lens, and the abutting surface is formed. It is possible to select the non-adjustment state where the lens is positioned on the surface or the state where the abutting surface can be avoided and the position of the lens can be adjusted in the front-back direction of the abutting surface. Position on the abutting surface of the section By selecting the non-adjusted state to be decided or the state where the abutting surface can be avoided and the lens position can be adjusted in the front-back direction of the abutting surface, it corresponds to both the case without adjustment and the case requiring adjustment. If the adjustment of the lens position is absolutely necessary (for example, if the processing accuracy of the abutting surface is insufficient or if the adjustment is required with a finer precision than the accuracy of the abutting surface, the same is possible. When using an optical system to create objects with different distance-measuring ranges, if the focus position is different in each measuring range, and because the wavelength of the light used in the same optical system was changed, the focal length of the lens changed and lens adjustment It is possible to fully cope with the situation when it is necessary to do).

According to a second aspect of the present invention, a detachable projection is provided on the outer surface of the flange portion of the lens according to the first aspect.
A groove for lens position adjustment is formed on the inner surface of the lens insertion part so that the projection can be inserted, and the inner part of the groove and the projection of the flange are abutting surfaces, and the projection is removed with the flange removed. Since the lens position can be adjusted in the front-back direction of the contact surface, in addition to the effect according to claim 1, when the lens position adjustment is not necessary, the protrusion of the flange portion is inserted into the groove of the lens insertion portion and projected. The lens can be positioned at the required position by hitting it.On the other hand, when the lens position needs to be adjusted, the protrusion can be removed from the flange by cutting etc. and the lens can be inserted in the front-back direction of the abutting surface. When adjusting the position of the lens, the protrusion does not get in the way, and the position of the lens can be adjusted in the front-back direction of the abutting surface. Therefore, even if lens adjustment is required, it is only necessary to remove the protrusion from the flange portion, which can reduce the number of assembling steps, and the positioning by abutting the lens and the position of the lens with a fine accuracy by the adjusting pin. Both adjustments can be easily selected.

According to a third aspect of the present invention, a protrusion is provided on the outer surface of the flange portion of the lens according to the first aspect, and the protrusion can be inserted at two circumferential positions on the inner surface of the lens insertion portion, and the lens can be inserted. Forming two grooves for adjusting the lens position having different depths when viewed from the inlet side of the groove, and using the depth of the shallow groove and the projection of the flange as an abutting surface, and the groove in the deep groove Since the position of the lens can be adjusted in the front-back direction of the abutting surface with the protrusions facing each other, in addition to the effect according to claim 1, when lens adjustment is not necessary, the flange portion is formed in the shallow groove. The lens can be positioned at the required position simply by inserting the projections on the other side and abutting it.On the other hand, when lens adjustment is required, by inserting the projections on the flange part into the deep groove, the front and back direction of the abutting surface can be improved. Abutting surface when adjusting the position of the lens Will not get in the way, it is the position adjustment of the lens in the longitudinal direction of the abutting surface. Therefore, when adjusting the lens, it is only necessary to insert the protrusion into the deep groove, and it is not necessary to remove the protrusion, so that the position of the lens can be adjusted without touching the lens.

According to a fourth aspect of the present invention, concave and convex portions having different depths when viewed from the rear end surface of the flange portion are formed on the rear end surface of the flange portion of the lens according to the first aspect, and the lens position is formed on the inner surface of the lens insertion portion. A protrusion is provided for adjustment, the convex portion and the protrusion of the flange portion are used as abutting surfaces, and the concave portion of the flange portion is opposed to the protrusion of the lens insertion portion in the front-back direction of the abutting surface. Since the position of can be adjusted,
In addition to the effects described, when lens adjustment is not required, the lens can be positioned at the required position simply by inserting the lens so that the convex portion of the flange portion abuts the protrusion of the lens insertion portion, and, When it is necessary to adjust the position of the lens, the lens position can be adjusted in the front-back direction of the abutting surface simply by inserting the lens so that the concave portion of the flange portion is aligned with the protrusion of the lens insertion portion. Therefore, it is not necessary to provide protrusions on the flange portion of the lens, and when adjusting the lens, simply rotate the lens and insert the lens with the protrusion of the lens insertion portion aligned with the recess of the flange portion. The lens position can be adjusted without changing the lens.

According to a fifth aspect of the present invention, two grooves having different depths when viewed from the rear end surface of the flange portion are formed at two positions in the circumferential direction of the rear end surface of the flange portion of the lens according to the first aspect. A protrusion for adjusting the lens position, which can be inserted into one of the two grooves, is provided on the inner surface of the insertion portion so that the depth of the groove on the shallow side of the flange portion and the projection of the lens insertion portion serve as a contact surface, and Since the position of the lens can be adjusted in the front-back direction of the abutting surface with the deep groove facing the protrusion of the lens insertion portion, in addition to the effect according to claim 1, when lens adjustment is not necessary, The lens can be positioned at the required position simply by abutting the projection on the lens insertion part in the shallow groove on the flange part, and if the lens position needs to be adjusted, the deep groove on the flange part Align the protrusions on the lens insertion part with the lens It is the position adjustment of the lens in the longitudinal direction of the abutting surface only by inserting. Therefore, it is not necessary to provide protrusions on the flange portion of the lens, and when adjusting the lens, simply rotate the lens and insert the lens with the protrusion of the lens insertion portion aligned with the recess of the flange portion. , It is possible to adjust the lens position without touching the lens.

According to a sixth aspect of the present invention, a flat surface is formed on the rear end surface of the flange portion of the lens according to the first aspect along the circumferential direction of the flange portion, and an inclined surface inclined in the front-back direction of the flat surface. Each of them is formed with a projection for adjusting the lens position on the inner surface of the lens insertion portion, and the flat surface and the projection of the flange portion are the abutting surfaces, and the lens is rotatable in the circumferential direction, and the flange portion is formed. The position of the lens can be adjusted in the front-back direction of the abutting surface by rotating the lens in the circumferential direction with the inclined surface of the abutting surface of the lens abutting against the projection of the lens insertion portion. If lens adjustment is not required, the lens can be positioned at the required position only by abutting the flat surface of the flange against the protrusion of the lens insertion part.If lens position adjustment is required, Of the flange The position of the lens can be adjusted in the front-back direction of the abutting surface simply by bringing the protrusion of the lens insertion part into contact with the inclined surface inclined in the front-back direction of the carrier surface and rotating the lens in the circumferential direction. By rotating the lens in the direction to adjust the position of the lens, more precise position adjustment can be performed.

[Brief description of drawings]

1A and 1B show an example of an embodiment of the present invention, in which FIG. 1A is an exploded perspective view of a light receiving lens and an optical base, FIG. 1B is an explanatory view of a lens inserting operation, and FIG. It is a figure.

FIG. 2 is an exploded perspective view illustrating the optical displacement sensor of the above.

FIG. 3 is an exploded perspective view illustrating a case of the above optical displacement sensor.

4A and 4B show another embodiment of the present invention, in which FIG. 4A is an exploded perspective view of a light receiving lens and an optical base, FIG. 4B is an explanatory view of a lens inserting operation, and FIG. FIG.

FIG. 5 shows still another example of the embodiment of the present invention, (a)
FIG. 4A is an exploded perspective view of a light receiving lens and an optical base, and FIG.

FIG. 6 shows still another example of the embodiment of the present invention, (a)
FIG. 4A is an exploded perspective view of a light receiving lens and an optical base, and FIG.

FIG. 7 shows still another example of the embodiment of the present invention, (a)
Is an exploded perspective view of the light receiving lens and the optical base, (b)
FIG. 7C is an explanatory diagram of a lens adjusting operation.

FIG. 8 is an explanatory diagram of a distance measuring principle.

FIG. 9A is a perspective view of a conventional optical base, and FIG.
FIG. 7C is a sectional view illustrating a fixed state of the lens.

[Explanation of symbols]

 2, 3 Lens 3a Flange part 4 Optical base 6 Lens insertion part 20,21 Protrusion 22 Abutment surface 23-26 Groove 31, 32 Concavo-convex part 35 Flat surface 36 Sloping surface A Front-back direction

Claims (6)

[Claims] 1. A light projecting lens for focusing light from a light projecting element and projecting the light along an axis of projection, and a light receiving element at the rear for receiving reflected light from an object on the projecting axis. In an optical displacement sensor including a light receiving lens for forming an image of light on an optical axis and an optical base having a lens insertion portion for inserting and positioning each lens, at least one of the light projecting lens and the light receiving lens is a flange. It is composed of a lens with a part, and the abutting surface is formed on the lens insertion part of the optical base and the flange part of the lens, and the lens is positioned by the abutting surface without adjustment, and the abutting surface is avoided. An optical displacement sensor characterized in that a state in which the lens position can be adjusted in the front-back direction of the surface can be selected. 2. A removable projection is provided on the outer surface of the flange portion of the lens, and a groove for adjusting the lens position is formed on the inner surface of the lens insertion portion, the groove for adjusting the lens position being recessed. 2. The optical displacement sensor according to claim 1, wherein the projection of the portion serves as an abutting surface, and the position of the lens can be adjusted in the front-back direction of the abutting surface with the projection removed from the flange portion. 3. A projection is provided on the outer surface of the flange portion of the lens, and the projection can be inserted into two locations on the inner surface of the lens insertion portion in the circumferential direction, and the depths differ from the entrance side of the lens insertion portion. Two grooves for adjusting the lens position are formed, the inner surface of the shallow groove and the projection of the flange are used as the abutting surface, and the surface of the flange is abutted with the projection of the flange facing the deeper groove. 2. The optical displacement sensor according to claim 1, wherein the position of the lens can be adjusted in the front-back direction. 4. A concave-convex portion having a different depth when viewed from the rear end surface of the flange portion is formed on the rear end surface of the flange portion of the lens, and a projection for adjusting the lens position is provided on the inner surface of the lens insertion portion, and the flange is formed. The position of the lens can be adjusted in the front-back direction of the abutting surface with the convex portion and the protrusion of the abutting portion serving as the abutting surface, and the concave portion of the flange portion facing the protrusion of the lens insertion portion. The optical displacement sensor according to claim 1. 5. Two grooves having different depths when viewed from the rear end surface of the flange portion are formed at two positions in the circumferential direction of the rear end surface of the flange portion of the lens, and one of the two grooves is formed on the inner surface of the lens insertion portion. A protrusion for lens position adjustment that can be inserted into the projection is provided so that the depth of the groove on the shallow side of the flange and the protrusion of the lens insertion portion are the abutting surfaces, and the groove on the deep side is the protrusion of the lens insertion portion. The optical displacement sensor according to claim 1, wherein the position of the lens can be adjusted in the front-back direction of the abutting surface in a state of facing each other. 6. A rear surface of a flange portion of the lens is formed with a flat surface along a circumferential direction of the flange portion and an inclined surface inclined in the front-back direction of the flat surface, and the lens is formed on an inner surface of the lens insertion portion. A protrusion for position adjustment is provided so that the flat surface and the protrusion of the flange portion are abutting surfaces, the lens is rotatable in the circumferential direction, and the inclined surface of the flange portion is protruded to the protrusion of the lens insertion portion. The optical displacement sensor according to claim 1, wherein the position of the lens can be adjusted in the front-rear direction of the abutting surface by rotating the lens in the circumferential direction in the contact state.