JP2013187158A - Photoelectric switch and electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate highly accurate attachment of a component.SOLUTION: A lens unit 4 holding a lens at the front surface side of a light source is loosely fitted into a recessed part 12 of the housing 1 through an uncured adhesive member 40. After the lens unit 4 is moved in the recessed part 12 so that a beam diameter and an optical axis of radiation light from the light source becomes proper, the adhesive member 40 is cured by ultraviolet radiation thereby fixing a position of the lens unit 4 relative to the housing 1.

Description

  The present invention relates to a photoelectric switch and an electrical device that can easily attach components with high accuracy.

  In order to optically detect the presence or absence of an object, a photoelectric switch is used. The photoelectric switch includes a main body and a reflecting member, and includes a light projecting unit and a light receiving unit in the main body. The presence / absence of an object between the housing and the reflecting member can be detected depending on whether the light receiving unit receives the reflected light of the light irradiated from the light projecting unit (see, for example, Patent Document 1). ).

  In the photoelectric switch, the main body and the reflecting member are arranged with a space through which an object passes between each other, and the light emitted from the light projecting unit is directed to the reflecting member so that the reflected light from the reflecting member can be received by the light receiving unit. Must be irradiated. For this reason, it is necessary to adjust appropriately the beam diameter and optical axis of the irradiation light from the light projection part with respect to a reflection member.

  In the conventional photoelectric switch, after adjusting the beam diameter and optical axis of the irradiation light in the main body by adjusting the tightening degree of a plurality of screws for attaching the substrate on which the light source is mounted inside the main body, for example, an ultraviolet curable resin or the like Is filled between the main body and the substrate or the light source, and the position of the light source with respect to the main body is fixed.

JP 2004-128422 A

  However, in the conventional photoelectric switch, in order to adjust the beam diameter and optical axis of the irradiation light in the main body, for example, it is necessary to adjust the tightening condition of four screws, and the adjustment work of the beam diameter and the optical axis is complicated and long. Need time. As described above, the conventional electric apparatus has a problem that the components cannot be easily attached with high accuracy.

  An object of the present invention is to provide a photoelectric switch and an electric device in which components can be easily attached with high accuracy.

  The photoelectric switch according to the present invention includes a housing, a lens unit, and an adhesive member. The housing has a recessed portion opened on the front surface. The lens unit holds a lens that distributes light from the light source to the front side, and is movable within a predetermined range and is inserted into the concave portion of the main body from the front side. The adhesive member adheres to the inner surface of the recess and the outer surface of the lens unit, and fixes the position of the lens unit in the recess.

  In this configuration, the position of the lens unit inserted into the recess so as to be movable within a predetermined range in the recess is fixed by the adhesive member. After the lens unit is inserted into the recess, the adhesive member is disposed between the inner surface of the recess and the outer surface of the lens unit so that the beam diameter and optical axis of the irradiated light are appropriate before the adhesive member is cured. Adjust the position of the lens unit from the front side of the recess. The lens unit is fixed at an appropriate position with respect to the housing by the cured adhesive member.

  In this configuration, the lens unit is preferably inserted into the recess so as to be movable within a predetermined range in each of three directions orthogonal to each other including the front-rear direction of the housing. The beam diameter and optical axis of the irradiation light from the light source can be adjusted appropriately.

  Moreover, it is preferable that a lens unit is provided with two side surfaces mutually parallel along the front-back direction of a housing | casing. By sandwiching the two side surfaces of the lens unit from the front side of the recess through a tool, the position of the lens unit in the recess can be easily adjusted.

  Furthermore, the adhesive member is preferably made of an ultraviolet curable adhesive, and adheres to at least a part of each of the inner peripheral surface of the recess and the outer peripheral surface of the lens unit. After adjusting the position of the lens unit in the recess, the lens unit can be fixed at an appropriate position with respect to the housing by irradiating ultraviolet rays.

  The light source is preferably a semiconductor laser, which is inserted into the recess from the back side of the housing. Assembling work of the photoelectric switch can be easily performed.

  In addition, the electrical device according to the present invention includes a housing having a recess opened on the front surface, a component that is movable within a predetermined range and is inserted into the recess from the front side, and a recess that is bonded to the recess and the component. An adhesive member for fixing the position of the component inside.

  According to this invention, components can be easily attached with high accuracy.

It is an exploded view of the photoelectric switch which concerns on embodiment of this invention. It is an exploded view of the housing | casing with which the photoelectric switch is equipped, and a support body. It is an exploded view of the lens unit with which the photoelectric switch is provided. It is a perspective view of the housing | casing which mounted | wore with the lens unit and the support body. It is a perspective view explaining adjustment work of irradiation light in the photoelectric switch.

  Hereinafter, a photoelectric switch according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the photoelectric switch 10 includes a housing 1, a support 2, a cover 3, a lens unit (optical component or component) 4, a filter 5, a front cover 6, volume knobs 7A and 7B, 7B, and a volume cover. 8 is provided.

  The housing 1 has two upper and lower recesses 11 and 12 that are open front and rear. The support 2 supports the substrate 9 and is inserted into the housing 1 from the back side. The cover 3 is attached to the housing 1 from the back side so as to cover the back surface and two side surfaces of the housing 1. The lens unit 4 is a cylindrical body opened front and rear, and is inserted into the recess 12 from the front side of the housing 1. The filter 5 is attached to the front surface of the recess 11. The front cover 6 covers the front side of the recesses 11 and 12. The volume knobs 7A and 7B are inserted into the volume mounted on the substrate 9. It is accommodated in the holes 1 and 14 on the upper surface of the housing 1, respectively. The volume cover 8 covers the upper surfaces of the volume knobs 7A and 7B.

  The housing 1 is formed with mounting holes 1A at two locations at the top and bottom. The photoelectric switch 10 can be attached to a wall surface or the like by a non-illustrated taking screw that penetrates the attachment hole 1A. Note that an attachment member other than the attachment hole 1 </ b> A can be provided in the housing 1.

  As shown in FIG. 2, the light receiving element 9 </ b> B is inserted into the recess 11 of the housing 1 from the back side of the housing 1. The light receiving element is electrically connected to an electronic component mounted on the substrate 9 supported by the support 2. A semiconductor laser 9 </ b> A is inserted into the recess 12 of the housing 1 from the back side of the housing 1. The semiconductor laser 9A is a light source of the present invention, and is electrically connected to an electronic component mounted on the substrate 9 supported by the support 2.

  On the inner peripheral surface of the recess 12, arc portions 121 are formed at four locations at 90 ° rotation angle positions. Each arc portion 121 includes a peripheral surface having a larger diameter than the inner peripheral surface of the recess 12. A hole 122 is formed in the circumferential surface of each arc portion 121. Each of the arc portions 121 has a predetermined depth D in the front-rear direction of the housing 1, and a step portion 123 is formed on the back side. A partition wall portion 124 is formed between the upper two arc portions 121 and the lower two arc portions 121. The partition wall portion 124 is formed between a predetermined length L in the circumferential direction of the circumferential surface of the arc portion 121.

  As shown in FIG. 3, the lens unit main body 403 constituting the lens unit 4 has a peripheral surface of a cylinder having a diameter smaller than the inner diameter of the recess 12, and a partial circumference sandwiched between the vertical surface 41 and the vertical surface 41. The protrusions 43 are formed at the four positions of the rotation angle position of 90 degrees on the front surface side. The total length N of the lens unit main body 403 in the front-rear direction of the housing 1 is shorter than the depth of the recess 12.

  The outer diameter of the protrusion 43 is smaller than the diameter of the circumferential surface of the arc portion 121. The protrusion 43 is formed with a cutout 431 that is open to the front surface and the outside in the radial direction. The length S of the protruding portion 43 is shorter than the predetermined depth D of the arc portion 121. The circumferential length M between the upper two protrusions 43 and the lower protrusion 43 is longer than the predetermined length L of the partition wall 124.

  In the lens unit main body 403, the lens 401 and the diaphragm member 402 are fitted from the back side. The projection 4021 of the diaphragm member 402 is press-fitted into a step portion (not shown) formed on the back surface of the lens unit main body 403, whereby the lens 401 and the diaphragm member 402 are fixed inside the lens unit main body 403.

  As shown in FIG. 4, the lens unit 4 is inserted into the recess 12 from the front side of the housing 1. With the support 2 attached to the back side of the housing 1, the semiconductor laser 9 </ b> A inserted from the back side into the recess 12 is positioned on the back side of the lens unit 4. Each cut portion 431 of the four projecting portions 43 faces the hole portion 122 of the arc portion 121.

  Since the lens unit 4 has an outer diameter and a total length shorter than the inner diameter and depth of the concave portion 12 and the protrusion 43 is smaller than the arc portion 121, three directions orthogonal to each other (arrow X direction, arrow Y direction, arrow Z direction). Is movable within a recess 12 over a predetermined range.

  As shown in FIG. 5, with the lens unit 4 inserted into the recess 12, the cutout portions 431 of the four projections 43 are filled with the adhesive member 40 made of an ultraviolet curable resin. The filling amount of the adhesive member 1 is such an amount that a part thereof enters the hole 122. The adhesive member 40 has a viscosity that does not leak from the cut portion 431 in an uncured state.

  In this state, the two vertical surfaces 41 are sandwiched by, for example, a tool having two thin plate-shaped sandwiching portions opposed to each other, and based on the measurement results of the beam diameter and optical axis position of the irradiation light from the light source, the lens unit 4 is moved in the directions of arrows X, Y, and Z. When the measurement result of the beam diameter and the optical axis position of the irradiation light becomes appropriate, the position of the lens unit 4 in the recess 12 is fixed via the cured adhesive member 40 by irradiating the adhesive member 40 with ultraviolet rays. The

  In this way, the lens unit 4 was moved in three directions orthogonal to each other with the lens unit 4 loosely fitted in the recess 12 via the uncured adhesive member 40, and the beam diameter and the optical axis of the irradiated light were adjusted. The lens unit 4 can be fixed at an appropriate position in the housing 1 by irradiating with ultraviolet rays later.

  The adhesive member 40 is not limited to an ultraviolet curable resin, and a thermosetting resin can also be used. In this case, after moving the lens unit 4 so that the beam diameter and the optical axis of the irradiation light are appropriate, the lens unit 4 is fixed at an appropriate position in the housing 1 by heating the adhesive resin 10. it can. The light source is not limited to a semiconductor laser.

  The above description of the embodiment is to be considered in all respects as illustrative and not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  For example, the optical member may be the lens itself in addition to the lens unit 4 including the lens unit main body 403, the lens 401, and the diaphragm member 402 as described above.

  The present invention can also be applied to electric devices other than photoelectric switches. For example, an electrical device includes a light source indicating an operating state, a light guide (component) that integrally receives light from the light source, and a penetration through which the light guide is inserted so that the other end of the light guide is exposed to the outside. In the case of a control device (programmable controller or the like) provided with a housing provided with a hole (concave portion), the invention described in the above embodiment can be applied as means for fixing the light guide to the housing. it can. That is, the light guide is made movable within a predetermined range, inserted into the through hole of the housing, and the position of the light guide in the through hole is fixed via an adhesive member that adheres to the through hole and the component.

  Furthermore, the electrical device is an electromagnetic relay (relay) including a base on which an external terminal, a coil, a fixed terminal (component) and a movable terminal (component) are mounted, and the movable terminal or fixed in a hole provided in the base. In the case of an electromagnetic relay into which a terminal is inserted, the invention described in the above embodiment may be applied as means for fixing the movable terminal or the fixed terminal to the hole. In other words, the movable terminal or the fixed terminal can be moved within a predetermined range and inserted into the hole of the base, and the position of the movable terminal or the fixed terminal in the hole is determined via an adhesive member that adheres to the hole and the movable terminal or the fixed terminal. Fix it.

  In addition, the electric device may be a storage device that reads and writes data such as a compact disk using light from a light source. The present invention can be applied to a structure for holding a lens (component) that collects light from a light source in a housing.

  Thus, by applying the present invention to electrical devices such as photoelectric switches, control devices, electromagnetic relays, and storage devices, it is possible to easily attach components with high accuracy.

1-housing 4-lens unit 10-photoelectric switch 12-recess 40-adhesive member

Claims (6)

A housing having a recess open to the front;
An optical member that holds a lens that distributes light from the light source to the front side, and is movable within a predetermined range and inserted into the recess from the front side;
An adhesive member that adheres to the concave portion and the optical member and fixes the position of the optical member in the concave portion;
With photoelectric switch.   The photoelectric switch according to claim 1, wherein the optical member is inserted into the recess so as to be movable within a predetermined range in each of three directions orthogonal to each other including the front-rear direction of the housing.   The photoelectric switch according to claim 1, wherein the optical member includes two side surfaces parallel to each other along a front-rear direction of the housing.   The photoelectric switch according to claim 1, wherein the adhesive member is made of an ultraviolet curable adhesive and adheres to at least a part of each of an inner peripheral surface of the recess and an outer peripheral surface of the optical member.   5. The photoelectric switch according to claim 1, wherein the light source is a semiconductor laser, and is inserted into the concave portion from the back side of the housing. A housing having a recess open to the front;
A component that is movable within a predetermined range and is inserted into the recess from the front side;
An adhesive member that adheres to the recess and the component and fixes the position of the component in the recess;
With electrical equipment.

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