JP4524574B2 - Lens fixing structure in photoelectric sensor - Google Patents

Description

  The present invention relates to a lens fixing structure in a photoelectric sensor suitable for an optical displacement sensor or the like that measures a distance to an object using a light cutting method or a triangulation method and detects the displacement of the object from the measured value. In particular, the present invention relates to a lens fixing structure in a photoelectric sensor that can increase the degree of freedom of layout inside the sensor by reducing the size and weight of the lens unit, and can easily and inexpensively cope with a lens size change.

  As is well known in the art, this type of optical displacement sensor irradiates a light beam to a detection target object, and captures reflected light from an oblique angle to receive light such as a PSD or a CCD. The light is guided to the element, and the distance to the object is measured using a light cutting method or a triangulation method based on the received light output, and the displacement of the object is detected from the measured value.

  FIG. 14 shows a configuration of a conventional displacement sensor, and FIG. 15 shows a configuration of an optical unit in the displacement sensor.

  In these figures, 101 is a case, 102 is a window plate, 103 is an optical unit, 104 is a circuit board, 105 is an electric cord, 106 is an insulating plate, 107 is a cover plate, 108 is a light emitting element, 109 is a light emitting element. A substrate, 110 is a light projecting lens, 111 is a light projecting lens holder, 112 is a light receiving element, 113 is a light receiving element substrate, 114 is a light receiving lens, 115 is a mounting screw, 116 is an optical base, and 117 is a mounting hole.

  In FIG. 14, a sensor case 101 is a molded product using aluminum as a material. A cover plate 107 is attached to one side opening thereof, and a window plate 102 is attached to a front opening. The light emitting / receiving beam is emitted or incident through the window plate 102.

  An optical unit 103 and a circuit board 104 are accommodated in the case 101. As will be described later with reference to FIG. 15, the optical unit 103 includes a light projecting element 108, a light projecting lens 110, a light receiving element 112, and a light receiving lens 114. Further, main circuit components constituting a light projecting circuit, a light receiving system circuit, a signal processing circuit, and the like are mounted on the circuit board 104. Reference numeral 117 denotes a screwing attachment hole for attaching the case 101 to an arbitrary support member.

  As shown in FIG. 15, a light projecting element substrate 109 on which the light projecting element 108 is mounted, a cylindrical light projecting lens holder 111 for holding the light projecting lens 110, and a light receiving element substrate 113 on which the light receiving element 112 is mounted. The light receiving lens 114 is integrally coupled via an optical base 116 which is a molded product using aluminum as a material. That is, the light projecting element substrate 109 and the light receiving element substrate 113 are screwed to the back side of the optical base 116. Further, the light projecting lens holder 111 is fixed by being screwed into a tunnel-like screw hole opened on the front side of the optical base 116. Similarly, the light receiving lens 114 is also inserted into a tunnel-like screw hole opened on the front surface of the optical base 116, and is fixed with a mounting screw 115. In the figure, 118 indicated by a one-dot chain line is a light projecting optical axis, and 119 is a light receiving optical axis.

  And as a structure which fixes the light projection lens 110 and the light reception lens 114 in the optical unit mentioned above to the optical base 116, the screw type shown in FIG. 16 and the press fixed type shown in FIG. 17 (a), (b). Are known from the past.

  That is, in the screw type, the lens 120 is supported by holding the outer periphery of the lens 120 with the holder 121 and tightening the lens 120 in the holder 121 with the screw 122. The holder 121 may be fixed to the optical base 123 with a screw (not shown) or the holder 121 and the optical base 123 may be integrated.

  Furthermore, as shown in FIG. 17A, the press-fixed type has a V groove 124 formed in the holder 121 to prevent the lens 120 from rolling, and the lens 120 is held by the V groove 124. The lens 120 is held by the holder 121 by pressing with a spring 125 from above. Reference numeral 126 in the figure denotes a screw for fixing the spring 125.

Also, as shown in FIG. 17B, the lens 120 is housed in a case-shaped holder 121 whose upper surface is opened, and both ends of the spring 125 are secured to the holder 121 with screws 126 so that the arrow from the spring 125 A structure is also known that applies a pressing force in the direction and fixes the lens 120 to the holder 121. Patent Document 1 discloses a structure of a screw type and a press-fixed type in which a V groove 124 is formed in the lens holder 121.
JP 2003-4416 A

  As described above, according to the conventional lens fixing structure, for example, the screw type fixing structure shown in FIG. 16 covers the outer periphery of the lens 120 with the holder 121, so that the holder 121 is enlarged. As the size and weight increase, the sensor unit itself tends to increase in size and weight. Furthermore, since it is screwed by the screw 122, it is necessary to thread the outside of the lens 120, which increases the processing cost and requires a new holder 121 to change the lens size. It has been pointed out that it is difficult to design and process it. At the same time, because the lens unit is enlarged, the flexibility of changing the layout is narrow, and in order to support multiple models with different detection ranges, it is necessary to prepare many new parts, increasing the mold cost, etc. There was a problem of incurring cost increase.

  Similarly, in the press-fixed structure shown in FIGS. 17 (a) and 17 (b), the tendency of the holder 121 to increase is inevitable, which causes an increase in the size and weight of the sensor unit and changes in the layout. In addition, since the holder 121 needs to be newly manufactured as the lens size is changed, the cost increases.

  The present invention has been made in view of such circumstances, and in a lens fixing structure in a photoelectric sensor, the lens unit is reduced in size and weight, and a layout change or a lens accompanying a change in a distance range or the like is achieved. It is an object of the present invention to provide a lens fixing structure in a photoelectric sensor that can easily and inexpensively cope with a change in size.

  In order to achieve the above object, according to the present invention, an optical unit and a circuit board are accommodated in a sensor case. The optical unit includes a light projecting element, a light projecting lens, a light receiving element, and a light receiving lens. And a fixing member for fixing at least one of the light projecting lens and the light receiving lens is fixed to the optical base with a screw, and has an angular shape. An L-shaped lens holder having a lens support surface, and a clamp fitting that is fixed to the lens holder and supports the outer peripheral surface of the lens in a gripping manner. The width dimension and the height dimension are set to be shorter than the lens diameter.

  Here, the lens to which the lens fixing structure is applied can be applied to the light receiving lens in the optical unit, or to both the light projecting lens and the light receiving lens.

  The fixing member for fixing the lens is an L-shaped lens holder for supporting the lens, and two clamp metal fittings which are fixedly stretched over the lens holder and wrap around the outer peripheral surface of the lens and press the lens toward the lens holder. Consists of. Here, the “angle-shaped lens support surface” refers to an inner surface portion that sandwiches a corner portion of an L-shaped holder, and refers to a surface that is orthogonal to each other and contacts the lower and side edges of the lens.

  According to such a configuration, since the width dimension and the height dimension of the lens holder are set shorter than the lens diameter, it is possible to reduce the size and weight of the lens unit including the lens and the fixing member, Since the space for the lens unit can be saved, the layout can be easily changed.

  Furthermore, in a preferred embodiment of the present invention, in order to support a plurality of models having different detection ranges, a plurality of screw holes are formed in the optical base, and a layout is obtained by selecting a screwing position of the lens holder. Made changes possible.

  According to such a configuration, a single optical base can be used for a plurality of models having different distance ranges, so that it is not necessary to prepare a molding die for each model, and the cost can be reduced.

  In a preferred embodiment of the present invention, the head of the screw that fixes the lens holder to the optical base is hidden by the lens supported by the lens holder and is not exposed to the outside.

  According to such a configuration, since the head of the screw for mounting the base of the lens holder can be covered with the lens, and the head of the screw is not exposed to the outside, the structure of the lens unit can be simplified. In addition, since the screw head is not exposed to the outside, the layout can be freely changed without considering interference with adjacent parts.

  In a preferred embodiment of the present invention, one end of the clamp fitting is wound around the back side of the lens holder, and the seating plate portion of the lens holder including this winding portion is fixed to the optical base with screws, and then the lens holder and After the lens is accommodated in a space formed between the clamp fitting assembled to the lens holder, the other end of the clamp fitting is fastened and fixed to the upper surface of the side wall plate portion of the lens holder, and the outer periphery of the lens is clamped. The lens is fixed by pressing the lens against the angle-shaped lens support surface of the lens holder while supporting the lens in a holding manner.

  According to such a configuration, if the screw for tightening is loosened, the restraint from the clamp fitting can be released, the lens can be easily finely adjusted, and the restraint of the clamp fitting is released when the lens unit layout is changed. Thereafter, the lens holder and the clamp fitting can be easily removed from the optical base by removing the lens and removing the screw for fixing the base through the opening.

  In a preferred embodiment of the present invention, the seating plate portion of the lens holder is formed in a step shape, and the lens is supported on the upper surface of the seating portion for a lens having a small lens diameter, and the lens diameter is large. For the lens, the lens holder was shared by cutting the step and supporting the lens on the lower surface.

  According to such a configuration, it is not necessary to prepare a new lens holder as the lens size is changed. For a lens having a small lens diameter, the upper surface of the seating plate portion of the lens holder is used as a lens support surface. The lens holder can be shared by using a lens holder that uses a lens support surface with the lower step surface of the seating plate portion in the lens holder, and cuts the step portion for a lens having a large lens diameter. When changing the lens size, it can be easily and inexpensively handled.

  In a preferred embodiment of the present invention, an opening is formed in the curved portion of the clamp fitting along a direction perpendicular to the optical axis of the lens.

  According to such a configuration, when the lens holder is screwed to the optical base, the lens holder and the fastening bracket are temporarily fastened, but the screw can be easily screwed by passing a tool such as a screwdriver through this opening. The fastening work can be performed, and a special tool with a complicated shape is not required for the screwing work.

  Furthermore, when the lens is assembled, the lens is accommodated in a space formed by the lens holder and the clamp fitting, and when the position is adjusted along the optical axis direction of the lens, the center position of the lens can be visually confirmed through this opening. Therefore, the lens positioning operation is easy.

  In a preferred embodiment, a thinned portion for receiving a winding flange formed at one end of the clamp fitting is provided on the bottom surface of the seating plate portion of the lens holder.

  According to such a configuration, when the lens is housed between the lens holder and the temporarily clamped clamp fitting, the lens is positioned at a predetermined position, and then the clamp fitting is fastened and fixed to the lens holder. Since the winding flange formed at one end of the clamp fitting is housed in the lightening part provided at the bottom of the lens holder, the mounting posture of the lens holder does not tilt even if the clamp fitting is tightened against the lens holder It is possible to attach a lens unit with high accuracy.

  In a preferred embodiment, the lens holder is a molded product using a lightweight material.

  Here, as a lightweight material, it is possible to use a light metal material such as aluminum, or an engineering plastic material, etc., when using aluminum or the like, a die-cast method can be applied, and when using an engineering plastic material, An injection molding method can be applied.

  According to such a configuration, in addition to the weight reduction accompanying the downsizing of the lens holder, the weight of the material itself can contribute to further weight reduction of the sensor unit.

  As described above, according to the lens fixing structure of the photoelectric sensor according to the present invention, a small and lightweight L-shaped lens holder as a fixing member for fixing the lens, and a part of the outer periphery of the lens are encapsulated. Since the lens unit is made of a clamp bracket that supports the lens unit, it is possible to reduce the size and weight of the lens unit, thereby facilitating the downsizing and weight reduction of the photoelectric sensor, and the freedom to change the layout as the lens unit becomes smaller. And the lens size can be changed easily and inexpensively.

  Hereinafter, a fixing structure of a light receiving lens in an optical displacement sensor which is a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  1 to 10 show a first embodiment of the present invention. FIG. 1 shows an external view of an optical displacement sensor which is a kind of photoelectric sensor, and FIG. 2 shows an internal configuration of a sensor case of the optical displacement sensor.

  In other words, the optical unit 3 and the circuit board 4 are accommodated in the sensor case 2 of the optical displacement sensor 1. In the first embodiment, the optical unit 3 and the circuit board 4 are assembled to the optical base 5. The optical base 5 is fixed to the sensor case 2 with screws. In FIG. 2, reference numeral 2 a denotes a filter that transmits a projection beam, a reflected beam, and the like, and 2 b denotes an adhesive sheet for bonding the filter 2 a to the sensor case 2. Further, a window 2c is adhered to the sensor case 2 via an adhesive sheet 2d on the opposite surface of the sensor case 2 to the filter 2a. Reference numeral 2e indicates an insulating sheet, and reference numeral 2f indicates a seal rubber.

  FIG. 3 shows a state where the insulating sheet 2g, the harness 2h and the like are removed from the optical unit 3 shown in FIG. 2, and FIG. 4 shows a state where the circuit board 4 is further removed. The circuit board 4 is mounted with main circuit components constituting a light projecting circuit, a light receiving system circuit, a signal processing circuit, and the like.

  3 and 4, the optical unit 3 will be briefly described. A plurality of studs 6 that support the circuit board 4 are erected on the optical base 5. The optical unit 3 includes a light projecting lens 7, a light projecting lens 7, and a light projecting lens 7. A light projecting lens holder 8 that supports the light lens 7 and a light projecting element substrate 9 are mounted.

  Furthermore, a light receiving lens unit 10, a reflection mirror 11, a reflection mirror holder 12, a light receiving element substrate 13, and a light receiving element substrate holder 14 are provided on the optical base 5.

  FIG. 5 shows an exploded configuration of the light receiving lens unit 10. The light receiving lens unit 10 includes a light receiving lens 20 and a fixing member for the light receiving lens 20. The fixing member is an L-shaped member. The light receiving lens holder 30 and the clamp fitting 40 that supports the outer peripheral surface of the light receiving lens 20 in a holding manner are constituted by two members.

  More specifically, the light receiving lens holder 30 is made of a lightweight aluminum die-cast product in the first embodiment, but it is also possible to use an injection molded product of an engineering plastic material.

  The L-shaped light receiving lens holder 30 includes a seating plate portion 31 mounted on the optical base 5 and a side wall plate portion 32 that rises in a direction orthogonal to the seating plate portion 31. In addition to functioning as the surfaces 31a and 32a, the width dimension b and the height dimension c of the lens support surfaces 31a and 32a are set shorter than the lens diameter a of the light receiving lens 20. That is, regarding the relationship between the dimensions b and c and the diameter dimension a of the light receiving lens 20, the light receiving lens holder 30 is downsized so as to satisfy the relationship of 1/2 × a <b, c, <a. This is a structural feature. When the width dimension b and the height dimension c of the lens support surfaces 31a and 32a are smaller than ½ of the lens diameter a, it is difficult to support the light receiving lens 20, while the width dimension b and the height dimension c. Is larger than the lens diameter a, the pressing force by the clamp fitting 40 cannot be effectively applied, so that the above-described relationship needs to be established.

  Further, screw holes 33 and 34 for attaching screws 50 and 51 to be screwed to the optical base 5 are formed in the seating plate portion 31, and screws 52 for fastening are provided on the upper surface of the side wall plate portion 32 rising from the seating plate portion 31. A screw hole 35 to be tightened is opened. Further, on the bottom surface of the seating plate portion 31 of the light receiving lens holder 30, a thinned portion 36 for accommodating the winding flange 42 of the clamp fitting 40 is formed.

  On the other hand, the clamp fitting 40 is a press-molded product made of a metal material such as aluminum, and has a shape that encloses the outer periphery of the light receiving lens 20, that is, a bending portion 41. A winding flange 42 to be wound around the bottom of 30 is bent inward, and a fastening flange 42 is bent at the other end so as to maintain a parallel relationship with the winding flange 42. The winding flange 42 is provided with an insertion hole 42 a for the screw 50, the fastening flange 43 is also provided with an insertion hole 43 a for the screw 52, and the bending portion 41 has a curved shape on the outer peripheral surface of the light receiving lens 20. The opening 44 for work along is opened.

  In the assembly of the light receiving lens unit 10, three screws 50, 51, 52 are used, but the first screw 50 is accommodated in the screw hole 33 of the seating plate portion 31 in the light receiving lens holder 30, and is optical. This is for fastening and fixing to the screw hole of the base 5, and has a function of fixing the light receiving lens holder 30 to the optical base 5. Next, the second screw 51 is accommodated in a screw hole 34 formed on the terminal side of the seating plate portion 31 in the light receiving lens holder 30, and the winding flange 42 of the clamp fitting 40 is provided on the back surface of the seating plate portion 31. The light receiving lens holder 30 and the winding flange 42 of the clamp fitting 40 have a function of being fastened and fixed to the optical base 5 in a state of being wound around the bottom.

  The third screw 52 is passed through the insertion hole 43a of the tightening flange 43 in the clamp fitting 40, and is tightened in the screw hole 35 provided in the upper surface of the side wall plate portion 32 in the lens holder 30, thereby fixing the clamp fitting 40 to the lens. The clamp 30 has a function of tightening the clamp fitting 40 that holds the light receiving lens 20 by tightening the holder 30.

  FIG. 6 shows an external view of the state where the assembly of the light receiving lens unit 10 is completed. In FIG. 7, (a) a front view, (b) a side view, (c) a bottom view, and (d) VII of the light receiving lens unit 10. -VII shows a cross-sectional view along the line.

  Thus, the light receiving lens unit 10 in the present embodiment can realize the light weight and size reduction of the optical unit 3 by reducing the size and weight of the light receiving lens holder 30.

  Next, a procedure for fixing the light receiving lens 20 will be described with reference to FIGS. First, as shown in FIG. 8, the light receiving lens holder 30 and the clamp fitting 40 are temporarily assembled, and the light receiving lens holder 30 is screwed into the screw hole 5 a of the optical base 5 with the screw 50, and the light receiving lens holder is tightened with the screw 51. 30 and the winding flange 42 of the clamp fitting 40 are fastened and fixed to the screw hole 5a of the optical base 5 together.

  At this time, the screw 52 previously inserted into the insertion hole 43a in the tightening flange 43 of the clamp fitting 40 is in an untightened state and provided with a clearance indicated by d in FIG. The light-receiving lens 20 can be easily inserted into the space S defined by the angle-shaped lens support surfaces 31a and 32a and the curved portion 41 of the clamp fitting 40, and after adjusting the optical axis, the screw 52 is attached. By tightening, as shown in FIG. 9, a pressing force from the clamp fitting 40 is applied to the light receiving lens 20, and the light receiving lens 20 is always pressed against the angled lens support surfaces 31 a and 32 a of the light receiving lens holder 30. This makes it possible to support the light receiving lens 20 firmly.

  At this time, the winding flange 42 of the clamp fitting 40 is accommodated on the bottom surface of the seating plate portion 31 in the light receiving lens holder 30, but since the lightening portion 36 corresponding to the thickness t of the clamp fitting 40 is provided, By tightening the screw 52, the light receiving lens holder 30 does not tilt, and the mounting posture of the light receiving lens 20 can be accurately maintained.

  Further, when the screws 50 and 51 are operated, the driver can be easily inserted into the space S through the opening 44 formed along the curved portion 41 of the clamp fitting 40, and the screws 50 and 51 can be tightened. Easy to do. Further, the opening 44 can be visually confirmed so that the center line 21 of the light receiving lens 20 comes to the center of the opening 44 when the light receiving lens 20 is positioned at an appropriate position. The opening 44 is used to position the light receiving lens 20. There is also an advantage that work can be performed easily.

  FIG. 10 shows a plan view of the light receiving lens unit 10 fixed to the optical base 5 and a mounting view of the light receiving lens unit 10. As described above, the L-shaped light receiving lens holder 30 and the clamp fitting 40 are used. Thus, the light receiving lens unit 10 can be reduced in size and weight. For example, when the layout of the light receiving lens unit 10 is changed to a different position on the optical base 5, the tightening screw 52 is loosened to release the restraining force from the clamp fitting 40 restraining the light receiving lens 20. The light receiving lens 20 can be easily removed from the light receiving lens holder 30, and the light receiving lens holder 30 can be easily detached from the optical base 5 by loosening the screws 50 and 51 through the opening 44 of the clamp fitting 40. Next, since the light receiving lens holder 30 is screwed to the screw holes 5a at different positions by using the screws 50 and 51, the position of the light receiving lens unit 10 can be easily changed in the operation procedure shown in FIG. When changing the model, the optical base 5 can be shared, and in particular, by reducing the size of the light receiving lens unit 10, the degree of freedom in layout can be increased.

  11 to 13 show a second embodiment of the present invention. In the first embodiment, the light receiving lens 20 having a large lens diameter is used, whereas in the second embodiment, the light receiving lens 200 having a small diameter is used. It is applied to the fixed structure.

  That is, also in the second embodiment, it is possible to use the L-shaped light receiving lens holder 30 that is reduced in size and weight and the clamp fitting 40 that wraps and holds the outer periphery of the light receiving lens 200 as in the first embodiment. Similarly, in order to set the height position of the optical axis of the light receiving lens 200 to the reference position, a stepped portion 37 is formed in the seating plate portion 31 of the light receiving lens holder 30, and the upper step surface of the stepped portion 37 is formed. 37a is used as the support surface 31 of the light receiving lens 200 with a small diameter.

  Other configurations are the same as those in the first embodiment. Furthermore, when supporting the small-diameter light receiving lens 200, the upper step surface 37a of the stepped portion 37 of the light receiving lens holder 30 is used as the support surface of the light receiving lens 200, but in the case of the light receiving lens holder 30 used in the first embodiment. Since the lower step surface 37b of the step portion 37 is used as the lens support surface, it can be dealt with by cutting the step portion 37 of the light receiving lens holder 30 with the step portion 37 used in the second embodiment. Therefore, the light receiving lens holder 30 can easily and inexpensively change the lens size, such as the large diameter light receiving lens 20 of the first embodiment and the small diameter light receiving lens 200 of the second embodiment.

  12 shows the optical unit 3 and the circuit board 4 on the optical base 5, and FIG. 13 shows the configuration of the optical unit 3 on the optical base 5 from which the circuit board 4 is removed. As shown in the figure, even when the lens size is changed, if the lens fixing structure according to the present invention is applied, the light projecting lens 7, the light projecting lens holder 8, and the light projecting element mounted on the optical base 5. The same specifications can be applied to the substrate 9, or the reflecting mirror 11, the reflecting mirror holder 12, the light receiving element substrate 13, and the light receiving element substrate holder 14, and the same light receiving lens holder 30 is used for changing the lens size. It is possible to cope with low cost simply by changing the layout.

  Although the embodiment described above is applied to the structure of the light receiving lens unit 10 in the optical displacement sensor 1, that is, the fixing structure of the light receiving lens 20, it can also be applied to the fixing structure of the light projecting lens.

  Further, the lens fixing structure described above is not limited to an optical displacement sensor, but can also be applied to a lens fixing structure in a distance setting type photoelectric sensor.

It is an external view which shows the optical displacement sensor to which this invention is applied. It is an exploded view which shows the structure inside the sensor case of the optical displacement sensor to which this invention is applied. It is a perspective view which shows the optical unit and circuit board in the sensor case of the optical displacement sensor to which this invention is applied. It is a schematic diagram which shows the structure of the optical unit accommodated in the sensor case of the optical displacement sensor to which this invention is applied. It is a disassembled perspective view which shows the structure of the light-receiving lens unit to which the lens fixing structure which concerns on this invention is applied. It is an external view which shows the light-receiving lens unit to which the lens fixing structure according to the present invention is applied. FIG. 3 is a normal perspective view of a light receiving lens unit to which a lens fixing structure according to the present invention is applied. It is explanatory drawing which shows the fixing structure of the lens which concerns on this invention. It is sectional drawing which shows the fixing structure of the lens which concerns on this invention. 1A is a plan view showing a light receiving lens unit to which a lens fixing structure according to the present invention is applied, and FIG. It is an external view which shows the light-receiving lens unit used for 2nd Example of this invention. It is a perspective view which shows the optical unit and circuit board containing the light-receiving lens unit used for 2nd Example of this invention. It is a perspective view which shows the optical unit containing the light-receiving lens unit used for 2nd Example of this invention. It is explanatory drawing which shows the structure of the conventional displacement sensor. It is explanatory drawing which shows the structure of the conventional optical unit. It is a schematic diagram which shows the fixing structure of the conventional screw type fixed type lens. It is a schematic diagram which shows the fixing structure of the conventional press fixed type lens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical displacement sensor 2 Sensor case 3 Optical unit 4 Circuit board 5 Optical base 6 Stud 7 Light projecting lens 8 Light projecting lens holder 9 Light projecting element board 10 Light receiving lens unit 11 Reflecting mirror 12 Reflecting mirror holder 13 Light receiving element board 14 Light receiving Element substrate holder 20,200 Light receiving lens 30 Light receiving lens holder 31 Seating plate portion 32 Side wall plate portion 31a, 32a Angle-shaped lens support surface 33, 34, 35 Screw hole 36 Thickening portion 37 Step portion 37a Upper step surface 37b Lower step surface 40 Clamp fitting 41 Curved portion 42 Entrainment flange 43 Tightening flange 44 Opening 50, 51, 52 Screw

Claims (5)

In the sensor case, a light projecting element, a light projecting lens, a light receiving element, an optical unit and the light receiving lens mounted on the optical base, and the circuit board, the fixation of the contact Keru lens housed photoelectric sensor Structure ,
The lens on at least one side of the light projecting lens and the light receiving lens is fixed by an L-shaped lens holder and a thin clamp metal fitting,
The lens holder includes a seating plate portion and a side wall plate portion that rises in a direction orthogonal to the seating plate portion, and an inner surface portion sandwiching the corner is used as a lens support surface, and the width and height dimensions of the lens support surface are It is set shorter than the lens diameter ,
The clamp fixture is a lens fixing structure in a photoelectric sensor , which is fixedly stretched between the seat plate end portion and the side wall plate end portion of the lens holder, and supports the outer peripheral surface of the lens in a holding manner . The lens holder, the end portion bottom surface of the seating plate portion, further comprising a lightening portion of the thin,
2. The lens fixing structure in the photoelectric sensor according to claim 1, wherein the clamp fitting is fixed on the optical base in a state where one end of the clamp fitting is wound around the lightening portion . The seating plate portion of the lens holder, a stepped portion is formed further comprising an upper surface and a lower surface,
3. The lens fixing structure in the photoelectric sensor according to claim 1 , wherein the lower step surface indicates a cutting height when the step portion is cut to support a lens having a large lens system . The said optical base further comprising a plurality of threaded holes,
Each position of the plurality of screw holes are opened in a position to be used in any of a plurality of models having different detection range of the photoelectric sensor, the lens in the photoelectric sensor according to any one of claims 1 to 3 Fixed structure. The clamp fitting has an opening along a direction perpendicular to the optical axis of the lens is opened, the fixed structure of the lens in the photoelectric sensor according to any one of claims 1 to 4.

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