JP4354322B2 - Photoelectric sensor, floodlighting device, and retroreflective mirror for photoelectric sensor - Google Patents

Description

  The present invention relates to a photoelectric sensor, a light projecting device, and a retroreflective mirror for a photoelectric sensor. More specifically, a light transmission window that transmits detection light is provided in a housing made of a fluororesin for housing a sensor body. The present invention relates to improvement of photoelectric sensors. In particular, the present invention relates to a retroreflective photoelectric sensor in which a light transmission window is formed using a glass plate or an acrylic resin plate.

  Conventionally, a photoelectric sensor having chemical resistance has been proposed (for example, Patent Document 2). Such a photoelectric sensor has improved chemical resistance, water resistance, and oil resistance by housing a sensor body made of a light receiving element in a housing made of a fluororesin. That is, by housing the sensor main body in a casing formed using a fluororesin having excellent chemical resistance, corrosion of the light receiving element and the like due to exposure of the sensor main body to chemicals and the like is prevented.

  However, the above-described conventional photoelectric sensor has a problem that the intensity of transmitted light is reduced or scattered when light for detection passes through a housing made of a fluororesin. In other words, the fluororesin casing has poor transparency and surface flatness. Therefore, when light is projected or received through the casing, the detection distance decreases or the projection spot becomes blurred. There was a problem.

  In particular, in a photoelectric sensor that uses laser light as detection light, it is considered that high-precision detection cannot be performed if the cross-sectional shape of the light projection beam is expanded by the fluororesin housing and the light projection spot is blurred. In addition, since the fluororesin casing disturbs the polarization when light passes through, the retroreflective photoelectric sensor using polarization loses the polarization of the transmitted light, resulting in false detection. it is conceivable that.

Therefore, a light transmission window that transmits the detection light is provided in the housing made of fluororesin, and this light transmission window is formed using a member other than the fluororesin, that is, a member having optical characteristics superior to that of the fluororesin. It is possible to do. However, while the fluororesin has excellent chemical resistance, it has extremely low adhesiveness (adhesiveness) and is difficult to join with other members. It was not easy.
Japanese Utility Model Publication No. 2-16537 JP-A-10-261350 JP 2002-246636 A

  As described above, the conventional photoelectric sensor having chemical resistance has a problem that the intensity of transmitted light is reduced or scattered when detection light is transmitted through the housing. Further, there is a problem that it is not easy to improve the optical characteristics without deteriorating the waterproof property. In addition, there is a problem that the polarization of transmitted light is lowered and erroneous detection occurs.

  The present invention has been made in view of the above circumstances, and a photoelectric sensor, a light projecting device, and a regression for a photoelectric sensor with improved optical characteristics without deterioration in chemical resistance, water resistance, and oil resistance. An object is to provide a reflective mirror. In particular, it is an object of the present invention to provide a photoelectric sensor in which the detection distance is reduced and the projection spot is prevented from blurring. It is another object of the present invention to provide a retroreflective photoelectric sensor with improved chemical resistance, water resistance and oil resistance without reducing the polarization of the transmitted light when the detection light is transmitted through the housing. .

  Another object of the present invention is to provide a photoelectric sensor with improved processability in the sensor assembly process without deteriorating chemical resistance, waterproofness and oil resistance.

The photoelectric sensor according to the invention comprises a Rukatamitai a fluororesin for accommodating the sensor main body consisting of the light receiving element, the housing, the light transmission window that transmits detection light provided on the front surface, incorporating the sensor body And a lid that seals the second opening after the sensor body is incorporated, and the light transmission window is provided in the housing. A glass plate that closes one opening surface, an annular sealing that is disposed at the peripheral edge of the first opening surface and is sandwiched between the glass plate and the housing, and provided inside the housing A guide for sliding the glass plate along the first opening surface and inserting the glass plate into the guide by sliding along the first opening surface. Press Configured to be from Sir.

  In addition to the above configuration, the photoelectric sensor according to the present invention is provided with welding ribs at the peripheral portion of the second opening and the peripheral portion of the lid, respectively, and is heat-welded after the sensor body is assembled. Composed.

  In addition to the above configuration, the photoelectric sensor according to the present invention is configured such that the sensor body includes a light emitting element that generates laser light, and the light receiving element detects light reflected by the retroreflective mirror. Is done.

The photoelectric sensor according to the invention comprises a Rukatamitai a fluororesin for accommodating the sensor main body consisting of the light receiving element, the housing, the light transmission window that transmits detection light provided on the front surface, incorporating the sensor body And a lid that seals the second opening after the sensor body is incorporated, and the light transmission window is provided in the housing. An acrylic resin plate that closes one opening surface; an annular sealing made of a fluororesin disposed between the acrylic resin plate and the housing; and an inner side of the housing A guide for sliding the acrylic resin plate along the first opening surface and inserting the acrylic resin plate into the guide by sliding along the first opening surface. Configured to comprise a spacer for pressing the opening surface.

Light projection apparatus according to the invention comprises a Rukatamitai a fluororesin for accommodating the light source body of the light emitting element for generating a laser beam, the housing, the light transmission window for transmitting the laser light is provided on the front surface A storage case provided with a second opening for incorporating the light source body on a side surface thereof, and a lid for sealing the second opening after the light source body is assembled. A glass plate for closing the first opening surface provided in the body, an annular sealing made of a fluororesin disposed on the periphery of the first opening surface and sandwiched between the glass plate and the housing, and A guide provided inside the housing and inserted by sliding the glass plate along the first opening surface, and inserted by sliding along the first opening surface. Spacer pressed against the opening surface Configured to be from the.

Retroreflective mirror photoelectric sensor according to the invention comprises a Rukatamitai a fluororesin for accommodating the reflection sheet for reflecting light, the housing, the light transmission window for transmitting the laser light is provided on the front surface A storage case in which a second opening for incorporating the light source body is provided on a side surface, and a lid that seals the second opening after the reflection sheet is incorporated, and the light transmission window includes the housing. A glass plate that closes the first opening surface provided on the inside of the body , and an annular sealing that is disposed on the peripheral edge of the first opening surface and is made of a fluororesin sandwiched between the glass plate and the housing; And a spacer which is slid along the first opening surface and is inserted into the housing and presses the glass plate against the first opening surface.

  In addition, the retroreflective mirror for a photoelectric sensor according to the present invention includes a reflective sheet that reflects light, a fluororesin, a housing that houses the reflective sheet, a front surface of the housing, and a detection light. A light transmission window that transmits light, a housing case in which the light transmission window is provided on the front surface and an opening for incorporating a reflection sheet on the back surface, and the opening after the reflection sheet is assembled. A glass plate for closing the opening surface for the light transmission window provided in the storage case, and a peripheral portion of the opening surface, the glass plate and the storage. It consists of an annular sealing made of a fluororesin sandwiched between cases, and the lid is configured to be attached by pressing the glass plate against the opening surface for the light transmission window.

  According to the photoelectric sensor, the light projecting device, and the retroreflective mirror for the photoelectric sensor according to the present invention, a light transmission window is formed from a glass plate or an acrylic resin plate using a sealing made of a fluororesin. Optical characteristics can be improved without deterioration of waterproofness and oil resistance. In particular, since the intensity reduction and scattering of transmitted light can be suppressed, it is possible to suppress the detection distance from decreasing and the projection spot from blurring. In addition, chemical resistance, waterproofness and oil resistance can be improved without lowering the polarization of transmitted light.

  In addition, since ribs for welding are provided on the periphery of the second opening and the peripheral edge of the lid in the storage case, processing in the sensor assembling process without deterioration in chemical resistance, water resistance and oil resistance. Can be improved.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an example of a schematic configuration of the photoelectric sensor device according to Embodiment 1 of the present invention. The photoelectric sensor device projects reflected light with a retroreflective mirror 3 and reflected light from the retroreflective mirror 3. A photoelectric sensor 2 that receives light is shown. The photoelectric sensor device 1 according to the present embodiment is a light detection switch including a photoelectric sensor 2 and a retroreflective mirror 3, and an object to be detected is detected between the photoelectric sensor 2 and the retroreflective mirror 3 using visible light. It detects whether or not it exists.

  The photoelectric sensor 2 is a small electronic device, and a sensor main body is housed in a housing made of fluororesin. A light transmission window for transmitting light for detection is provided on the front surface of the housing that houses the sensor body.

  The retroreflective mirror 3 is a retroreflective reflector that reflects the light projected by the photoelectric sensor 2 toward the photoelectric sensor 2, and houses a reflective sheet in a housing made of fluororesin. A light transmission window 3a for transmitting the detection light is provided on the front surface of the casing that houses the reflection sheet.

  FIG. 2 is a perspective view showing an example of the details of the main part of the photoelectric sensor device of FIG. 1, and shows a photoelectric sensor 2 having a housing made up of a storage case 4 and a lid 5. The photoelectric sensor 2 includes a sensor body, a storage case 4 provided with the above-described light transmission window 7 on the front surface, and an opening (second opening) for incorporating the sensor body on the side surface, and the sensor body. After that, it comprises a lid 5 for sealing the second opening.

  The storage case 4 is a casing formed in a box shape using a fluororesin, and a window for improving the strength of the light transmission window 7 is provided around the opening (first opening) provided on the front surface. A frame 6 is formed. A cable tube 8 for covering a cable extending from the sensor body is attached to the rear portion of the storage case 4.

  3 (a) and 3 (b) are plan views showing the photoelectric sensor of FIG. 2, and FIG. 3 (a) shows a state viewed from the side of the storage case 4, and FIG. ) Shows a state seen from the front side of the storage case 4.

  4A and 4B are cross-sectional views of the photoelectric sensor in FIG. 3 cut along the line A1-A1, and FIG. 4A shows the internal state of the photoelectric sensor 2. FIG. Details of the main part B1 are shown in (b). The sensor body 11 housed in the housing case 4 includes a light emitting element that generates laser light as projection light and a light receiving element that receives reflected light and generates a detection signal. The projection light generated by the light emitting element is projected forward from the opening 11a of the sensor body 11, and the reflected light from the regressive reflection type mirror 3 is received through the opening 11a.

  A cable 12 for supplying power to the light emitting element or transmitting a detection signal is drawn out of the storage case 4 through the cable tube 8. The cable tube 8 is a flexible tube made of a fluororesin, and is inserted into a guide 9 provided in the storage case 4 and attached. The guide 9 is a support means for holding the cable tube 8 in parallel with the direction in which the cable 12 is pulled out, and the cable tube 8 and the end of the guide 9 are heated and welded from the inside of the storage case 4, thereby 8 is fixed to the storage case 4.

  In the storage case 4, a sensor body 11 is pressed against the light transmission window 7 to be positioned, and a guide 13 for preventing the sensor body 11 from rattling in the storage case 4 is provided.

  The light transmission window 7 includes an annular sealing 14 made of a fluororesin, a glass plate 15 that covers the first opening 10 surface provided in the storage case 4, and a glass plate 15 that slides along the first opening 10 surface. The guide 17 for inserting and the spacer 16 for pressing the glass plate 15 against the surface of the first opening 10.

  The sealing 14 is a packing formed using an elastic member such as fluoro rubber. The sealing 14 is disposed at the peripheral edge of the surface of the first opening 10 and is sandwiched between the glass plate 15 and the storage case 4.

  The glass plate 15 is a plate-like translucent member, and has an optical characteristic superior to that of a fluororesin. Specifically, transparency, surface flatness, characteristics with respect to polarized light, and the like are excellent.

  The guide 17 is a holding guide means that is provided inside the storage case 4 and holds the glass plate 15 parallel to the surface of the first opening 10.

  The light transmission window 7 is formed by inserting the sealing 14 and the glass plate 15 into the guide 17 and then inserting the spacer 16 into the guide 17 by sliding the spacer 16 along the surface of the first opening 10. It is formed in a state of being pressed against the wall surface of the storage case 4. That is, the light transmission window 7 is formed by sliding the sealing 14, the glass plate 15, and the spacer 16 into the storage case 4 from the second opening along the surface of the first opening 10.

  The sealing plate 14 is sandwiched between the glass plate 15 and the wall surface of the storage case 4, and the first opening 10 is closed while the glass plate 15 is pressed against the wall surface of the storage case 4 through the ceiling 14 by the spacer 16. The airtightness in 4 can be maintained.

  Here, it is assumed that welding ribs 4a and 5a are provided on the peripheral portion of the second opening and the peripheral portion of the lid 5, respectively. The ribs 5 a are provided so as to protrude in the direction in which the lid 5 is attached, and are formed so as to surround the periphery of the lid 5. The rib 4a is provided in the storage case 4 so as to protrude in the attaching direction of the lid 5, and is formed so as to surround the periphery of the second opening. The ribs 4 a and 5 a are heat-welded after the sensor body 11 is assembled in the storage case 4. The lid 5 is a fitting type and is fixed by welding in a state of being fitted in the storage case 4.

  FIG. 5 is an exploded perspective view showing the configuration of the photoelectric sensor of FIG. In this photoelectric sensor 2, the light transmission window 7 is formed by inserting the sealing 14, the glass plate 15 and the spacer 16 into the guide 17 after the cable tube 8 is attached to the storage case 4. After the light transmission window 7 is formed, the sensor body 11 is assembled in the storage case 4 and the lid 5 is welded to the storage case 4 to complete the photoelectric sensor 2.

  FIG. 6 is a perspective view showing an example of the details of the main part of the photoelectric sensor device of FIG. 1, in which the retroreflective mirror 3 having a housing made up of a storage case 21 and a lid 22 is shown. The regressive reflection mirror 3 includes a reflection sheet that reflects light, a light transmission window 3a on the front surface, and a storage case 21 that has an opening (second opening) for incorporating the reflection sheet on the side surface. It comprises a lid 22 for sealing the second opening after incorporating the reflection sheet.

  The storage case 21 is a casing formed in a box shape using a fluororesin, and a window for improving the strength of the light transmission window 3a is provided around the opening (first opening) provided on the front surface. A frame 24 is formed.

  FIGS. 7A and 7B are plan views showing the retroreflective mirror of FIG. 6, and FIG. 7A shows a state seen from the front side of the storage case 21, and FIG. FIG. 4B shows a state viewed from the side surface of the storage case 21.

  FIG. 8 is a cross-sectional view of the retroreflective mirror of FIG. 7 taken along the line A2-A2, and shows the internal state of the retroreflective mirror 3. FIG. The reflection sheet 26 stored in the storage case 21 is a reflecting mirror formed by mold processing using acrylic resin or polycarbonate resin. In this reflection sheet 26, incident light is reflected (regressive reflection) in the incident direction. That is, the projection light from the photoelectric sensor 2 is reflected toward the photoelectric sensor 2 by the reflection sheet 26.

  The reflection sheet 26 has an effect of disturbing the polarization of linearly polarized light having a plane parallel to the incident direction as a polarization plane when reflecting incident light. For example, it has the effect of rotating the polarization plane by 90 °. By using the reflector composed of the reflection sheet 26 having such an action, it is possible to discriminate between the reflected light from the reflector and the reflected light from the object based on the polarization property. Thereby, even if it is an object that specularly reflects light, it is possible to accurately detect whether or not an object to be detected exists between the photoelectric sensor and the reflector.

  The light transmission window 3a includes an annular sealing 25 made of fluororesin, a glass plate 23 that closes the surface of the first opening 28 provided in the storage case 21, and a surface for pressing the glass plate 23 against the surface of the first opening 28. A spacer 27;

  The sealing 25 is a packing formed using an elastic member such as fluoro rubber. The sealing 25 is disposed at the peripheral edge of the surface of the first opening 28 and is sandwiched between the glass plate 23 and the storage case 21.

  The light transmission window 3a is configured such that after the sealing 25 and the glass plate 23 are inserted into the storage case 21, the spacer 27 and the reflection sheet 26 are slid along the surface of the first opening 28 and inserted into the storage case 21. Thus, the glass plate 23 is formed in a state of being pressed against the wall surface of the storage case 21 through the sealing 25. That is, the light transmission window 3 a is formed by sliding the sealing 25, the glass plate 23, the reflection sheet 26, and the spacer 27 into the storage case 21 from the second opening along the surface of the first opening 28.

  The sealing case 25 is sandwiched between the glass plate 23 and the wall surface of the storage case 21, and the first opening 28 is closed while the glass plate 23 is pressed against the wall surface of the storage case 21 through the ceiling 25 by the spacer 27. The airtightness in 21 can be maintained.

  Here, it is assumed that welding ribs 21a and 22a are provided on the peripheral portion of the second opening and the peripheral portion of the lid 22, respectively. The ribs 22 a are provided so as to protrude in the direction in which the lid 22 is attached, and are formed so as to surround the periphery of the lid 22. The rib 21a is provided in the storage case 21 so as to protrude in the attaching direction of the lid 22, and is formed so as to surround the periphery of the second opening. The ribs 21a and 22a are heat-welded after the reflection sheet 26 and the like are incorporated into the storage case 21. The lid 22 is a fitting type, and is fixed by welding in a state of being fitted in the storage case 21.

  FIG. 9 is an exploded perspective view showing the configuration of the retroreflective mirror of FIG. In the retroreflection type mirror 3, the light transmission window 3 a is formed by sliding the sealing 25, the glass plate 23, the reflection sheet 26 and the spacer 27 into the storage case 21. After the formation of the light transmission window 3a, the lid 22 is welded to the storage case 21, whereby the retroreflective mirror 3 is completed. The spacer 27 is provided with an engagement hole 27a for holding the reflection sheet 26 parallel to the surface of the first opening 28. The reflection sheet 26 is slid into the storage case 21 while being stored in the engagement hole 27a.

  Here, the fluororesin used for the photoelectric sensor 2 and the regressive reflection type mirror 3 will be described. Generally, a fluororesin is a thermoplastic resin (plastic) excellent in chemical resistance, heat resistance, cold resistance, weather resistance, and the like, and a member made of the fluororesin can be used under a wide variety of circumstances. For example, it is inactive against high temperatures and high concentrations of strong acids and strong alkalis, and is also insoluble in these solvents. In addition, it can be used for a long time under outdoor exposure conditions.

  Examples of such a fluororesin include those shown below, in which tetrafluoroethylene is TFE, vinylidene fluoride is VDF, and ethylene trifluoride chloride is CTFE. The photoelectric sensor 2 and the regressive reflection type mirror 3 can be formed individually or in combination.

(1) PTFE (tetrafluoroethylene resin: TFE homopolymer)
(2) PFA (perfluoroalkoxy resin: copolymer of TFE and perfluoroalkyl vinyl ether)
(3) MFA (perfluoroalkoxy resin: copolymer of TFE and perfluoromethyl vinyl ether)
(4) FEP (tetrafluoroethylene / hexafluoropropylene resin: copolymer of TFE and hexafluoropropylene)
(5) ETFE (ethylene / tetrafluoroethylene resin: alternating copolymer of ethylene and TFE)
(6) PVDF (vinylidene fluoride resin: VDF homopolymer)
(7) PCTFE (Trifluoroethylene chloride resin: CTFE homopolymer)
(8) ECTFE (ethylene / ethylene trifluoride ethylene chloride resin: alternating copolymer of ethylene and CTFE)

  FIGS. 10A and 10B are plan views showing an example of the operation of assembling the light transmission window in the photoelectric sensor of FIG. 2. FIG. 10A shows the sealing 14 assembled in the storage case 4. The side view in the state after a short time is shown, and the front view is shown by FIG.10 (b). 11 is a cross-sectional view of the photoelectric sensor of FIG. 10 cut along line A3-A3.

  First, the cable tube 8 is inserted into the guide 9 of the storage case 4, and the ends of the cable tube 8 and the guide 9 are heated and melted from the inside of the storage case 4 and welded using a heater. After the cable tube 8 is attached, the sealing 14 is assembled in the storage case 4. Next, the glass plate 15 and the spacer 16 are sequentially inserted and assembled into the guide 17 in the storage case 4.

  12A and 12B are plan views showing an example of the operation of assembling the light transmission window in the photoelectric sensor of FIG. 2. In FIG. 12A, the glass plate 15 is assembled to the guide 17. A side view in the later state is shown, and a front view is shown in FIG. FIG. 13 is a cross-sectional view of the photoelectric sensor of FIG. 12 cut along line A4-A4.

  FIGS. 14A and 14B are plan views showing an example of the operation of assembling the light transmission window in the photoelectric sensor of FIG. 2. FIG. 14A shows the state after the spacer 16 is assembled to the guide 17. The side view in the state of this is shown, and the front view is shown by FIG.14 (b). FIG. 15 is a cross-sectional view of the photoelectric sensor of FIG. 14 cut along line A5-A5.

  When the spacer 16 is assembled to the guide 17, the light transmission window is completed. After the light transmission window is completed, the sensor body 11 is assembled in the storage case 4 and the lid 5 is welded to the storage case 4 to complete the photoelectric sensor 2.

  16 (a) and 16 (b) are plan views showing an example of the operation of assembling the light transmission window in the retroreflective mirror of FIG. 6, and FIG. 16 (a) shows the ceiling 25 in the storage case 21. The side view in the state after assembling | attaching is shown, and the front view is shown by FIG.16 (b). 17 is a cross-sectional view of the retroreflective mirror of FIG. 16 cut along line A6-A6.

  First, the sealing 25 is assembled in the storage case 21. Next, the glass plate 23, the reflection sheet 26, and the spacer 27 are inserted and assembled in the storage case 21 in order.

  FIGS. 18A and 18B are plan views showing an example of the operation of assembling the light transmission window in the retroreflective mirror of FIG. 6. In FIG. 18A, the glass plate 23 is placed in the storage case 21. The side view in the state after assembling | attaching in is shown, and the front view is shown by FIG.18 (b). FIG. 19 is a cross-sectional view of the retroreflective mirror of FIG. 18 taken along line A7-A7.

  20 (a) and 20 (b) are plan views showing an example of the operation of assembling the light transmission window in the retroreflective mirror of FIG. 6. In FIG. 20 (a), the reflection sheet 26 and the spacer 27 are shown. A side view in a state after being assembled in the storage case 21 is shown, and a front view is shown in FIG. 21 is a cross-sectional view of the retroreflective mirror of FIG. 20 taken along line A8-A8.

  When the reflection sheet 26 and the spacer 27 are assembled in the storage case 21, a light transmission window is completed. When the lid 22 is welded to the storage case 21 after the light transmission window is completed, the retroreflective mirror 3 is completed.

  According to the present embodiment, since the light transmission window (glass window) made of the glass plate 15 is formed in the storage case 4 that stores the sensor body 11, the chemical resistance, waterproofness, and oil resistance are not reduced. Optical characteristics can be improved. In particular, since it is possible to suppress the detection distance from decreasing and the cross-sectional shape of the light projection beam from expanding, it is possible to prevent the light projection spot from blurring. Therefore, highly accurate detection can be performed.

  Further, in the case of a photoelectric sensor using polarization, it is possible to prevent loss of polarization of transmitted light, so that erroneous detection can be prevented. Therefore, chemical resistance, waterproofness and oil resistance can be improved without reducing the polarization of transmitted light when light for detection passes through the glass window.

  Further, since the glass window can be assembled by sliding the sealing 14, the glass plate 15 and the spacer 16 from the second opening for incorporating the sensor body 11, the assembling operation can be simplified. Therefore, the processability in the sensor assembly process can be improved without lowering the chemical resistance, waterproofness and oil resistance.

  In the present embodiment, an example in which the light transmission window in the photoelectric sensor 2 and the retroreflective mirror 3 is formed using a glass plate has been described. However, the present invention is not limited to this, and optical The light transmission window may be formed by using a member having a higher characteristic than the fluororesin. For example, an acrylic resin plate may be used instead of the glass plate. When the light transmission window is formed using an acrylic resin plate, the chemical resistance is lower than that using a glass plate, but the manufacturing cost can be reduced without lowering the waterproof property.

  In the present embodiment, an example in which a light transmission window is formed in the housing case 4 in which the sensor body 11 including the light emitting element and the light receiving element is incorporated has been described. However, the present invention is not limited to this. For example, a light transmission window may be formed in a storage case for incorporating a light source body made of a light emitting element. That is, the present invention can also be applied to a projector that has only a light source. Further, the present invention can be applied to a photoelectric sensor having only a light receiving element.

Embodiment 2. FIG.
In the first embodiment, the example in which the second opening for incorporating the reflection sheet is provided on the side surface of the casing in the retroreflective mirror has been described. In contrast, in the present embodiment, a case where the second opening is provided on the back surface of the housing will be described.

  FIG. 22 is a perspective view showing an example of a retroreflective mirror according to the second embodiment of the present invention. The retroreflective mirror 30 includes a reflection sheet, a storage case 31 provided with a light transmission window 33 on the front surface and a second opening on the back surface, and the second opening sealed after the reflection sheet is incorporated. It consists of a lid.

  The storage case 31 is a casing formed in a box shape using fluororesin, and the strength of the light transmission window 33 is provided around the first opening (opening for the light transmission window) provided on the front surface. A window frame 32 for improvement is formed.

  23A to 23C are plan views showing the retroreflective mirror of FIG. 22, and FIG. 23A shows a state seen from the front side of the storage case 31, and FIG. FIG. 23B shows a state seen from the side surface of the storage case 31, and FIG. 23C shows a state seen from the back side of the storage case 31.

  24A and 24B are cross-sectional views of the retroreflective mirror shown in FIG. 23 taken along line A9-A9. FIG. 24A shows the internal state of the retroreflective mirror 30. FIG. FIG. 24B shows details of the main part B2. The reflection sheet 35 stored in the storage case 31 is formed using an acrylic resin or a polycarbonate resin. In the reflection sheet 35, incident light is reflected (regressive reflection) in the incident direction. That is, the projection light from the photoelectric sensor 2 is reflected toward the photoelectric sensor 2 by the reflection sheet 35.

  The light transmission window 33 includes an annular sealing 36 made of a fluororesin and a glass plate 38 that closes the surface of the first opening 37 provided in the storage case 31. The sealing 36 is a packing formed using an elastic member such as fluoro rubber.

  The light transmission window 33 is formed by inserting the sealing plate 36, the glass plate 38 and the reflection sheet 35 into the storage case 31, and then attaching the lid 34 to the storage case 31. It is formed in a state of being pressed against the surface of the opening 37. In other words, the light transmission window 33 is welded to the storage case 31 with the sealing 36, the glass plate 38, and the reflection sheet 35 sequentially assembled from the second opening into the storage case 31, with the lid 34 pressed against the front side. It is formed by.

  The sealing plate 36 is sandwiched between the glass plate 38 and the wall surface of the storage case 31, and the first opening 37 is closed while the glass plate 38 is pressed against the wall surface of the storage case 31 through the ceiling 36 by the lid 34. The airtightness in 31 can be maintained.

  Here, it is assumed that welding ribs 31 a and 34 a are provided on the peripheral portion of the second opening and the peripheral portion of the lid 34, respectively. The ribs 34 a are provided so as to protrude in the direction in which the lid 34 is attached, and are formed so as to surround the periphery of the lid 34. The rib 31a is provided in the storage case 31 so as to protrude in the attaching direction of the lid 34, and is formed so as to surround the periphery of the second opening. The ribs 31 a and 34 a are heat-welded after the reflection sheet 35 or the like is assembled in the storage case 31. The lid 34 is a fitting type, and is fixed by welding in a state of being fitted in the storage case 31.

  FIG. 25 is an exploded perspective view showing the configuration of the retroreflective mirror of FIG. In the retroreflective mirror 30, the light transmission window 33 is formed by assembling the sealing 36, the glass plate 38, and the reflection sheet 35 in the storage case 31. After forming the light transmission window 33, the lid 34 is welded to the storage case 31 to complete the retroreflective mirror 30.

  According to the present embodiment, since the light transmission window made of the glass plate 38 is formed in the storage case 31 for storing the reflection sheet 35, the optical characteristics can be improved without deteriorating the chemical resistance, waterproofness and oil resistance. Can be improved. In particular, it is possible to prevent the detection distance from decreasing and the cross-sectional shape of the reflected beam from expanding, so that it is possible to prevent the light receiving spot from blurring.

It is the perspective view which showed an example of schematic structure of the photoelectric sensor apparatus by Embodiment 1 of this invention. FIG. 2 is a perspective view illustrating an example of details of a main part in the photoelectric sensor device of FIG. 1, in which a photoelectric sensor 2 having a housing including a storage case 4 and a lid 5 is illustrated. It is the top view which showed the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 3 by the A1-A1 line. FIG. 3 is an exploded perspective view showing a configuration of the photoelectric sensor of FIG. 2. FIG. 2 is a perspective view illustrating an example of details of a main part in the photoelectric sensor device of FIG. 1, in which a retroreflective mirror 3 having a housing including a storage case 21 and a lid 22 is illustrated. FIG. 7 is a plan view showing the regressive reflection type mirror of FIG. 6. It is sectional drawing which cut | disconnected the regression reflection type mirror of FIG. 7 by the A2-A2 line | wire, and the mode of the inside in the regression reflection type mirror 3 is shown. It is the disassembled perspective view which showed the structure in the regression reflection type mirror of FIG. It is the top view which showed an example of the assembly | attachment operation | movement of the light transmissive window in the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 10 by the A3-A3 line. It is the top view which showed an example of the assembly | attachment operation | movement of the light transmissive window in the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 12 by the A4-A4 line. It is the top view which showed an example of the assembly | attachment operation | movement of the light transmissive window in the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 14 by the A5-A5 line. It is the top view which showed an example of the assembly | attachment operation | movement of the light transmissive window in the regressive reflection type mirror of FIG. It is sectional drawing which cut | disconnected the regression reflection type mirror of FIG. 16 by the A6-A6 line. It is the top view which showed an example of the assembly | attachment operation | movement of the light transmissive window in the regressive reflection type mirror of FIG. It is sectional drawing which cut | disconnected the regression reflection type mirror of FIG. 18 by the A7-A7 line | wire. It is the top view which showed an example of the assembly | attachment operation | movement of the light transmissive window in the regressive reflection type mirror of FIG. It is sectional drawing which cut | disconnected the regression reflection type mirror of FIG. 20 by the A8-A8 line | wire. It is the perspective view which showed an example of the retroreflection type mirror by Embodiment 2 of this invention. It is the top view which showed the regressive reflection type mirror of FIG. It is sectional drawing which cut | disconnected the regression reflection type mirror of FIG. 23 by the A9-A9 line. It is the disassembled perspective view which showed the structure in the regression reflection type mirror of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Photoelectric sensor apparatus 2 Photoelectric sensor 3,30 Regression reflection type mirror 3a, 7,33 Light transmission window 4,21,31 Storage case 4a, 5a, 21a, 22a, 31a, 34a Rib 5,22,34 Lid 6,24 , 32 Window frame 8 Cable tube 9, 13, 17 Guide 10, 37 First opening 11 Sensor body 11a Opening 12 Cable 14, 25, 36 Sealing 15, 23, 38 Glass plate 16, 27 Spacer 26, 35 Reflective sheet 27a engagement hole

Claims (9)

In the photoelectric sensor with Rukatamitai a fluororesin for accommodating the sensor main body consisting of the light receiving element,
The housing has a light transmission window through which detection light is transmitted provided on the front surface, a storage case in which a second opening for incorporating the sensor body is provided on a side surface, and a second case after the sensor body is assembled. It consists of a lid that seals the opening,
The light transmission window includes a glass plate that closes the first opening surface provided in the housing;
An annular sealing made of a fluororesin disposed on the periphery of the first opening surface and sandwiched between the glass plate and the housing;
A guide provided inside the housing and inserted by sliding the glass plate along the first opening surface;
A photoelectric sensor comprising: a spacer which is slid along the first opening surface and is inserted into the guide and presses the glass plate against the first opening surface. 2. The photoelectric sensor according to claim 1 , wherein a welding rib is provided in each of a peripheral portion of the second opening and a peripheral portion of the lid, and is heat-welded after the sensor body is assembled. The sensor body has a light emitting element that generates laser light,
The photoelectric sensor according to claim 1, wherein the light receiving element detects light reflected by a retroreflective mirror. In the photoelectric sensor with Rukatamitai a fluororesin for accommodating the sensor main body consisting of the light receiving element,
The housing has a light transmission window through which detection light is transmitted provided on the front surface, a storage case in which a second opening for incorporating the sensor body is provided on a side surface, and a second case after the sensor body is assembled. It consists of a lid that seals the opening,
The light transmission window includes an acrylic resin plate that closes the first opening surface provided in the housing;
An annular sealing made of a fluororesin disposed between the acrylic resin plate and the housing; and disposed at a peripheral portion of the first opening surface;
A guide that is provided inside the housing and that is inserted by sliding the acrylic resin plate along the first opening surface;
A photoelectric sensor comprising: a spacer which is slid along the first opening surface and is inserted into the guide and presses the acrylic resin plate against the first opening surface. In light projecting device having a Rukatamitai a fluororesin for accommodating the light source body of the light emitting element for generating a laser beam,
The housing is provided with a light transmission window through which laser light is transmitted on the front surface, a storage case in which a second opening for incorporating the light source body is provided on a side surface, and a second case after the light source body is assembled. It consists of a lid that seals the opening,
The light transmission window includes a glass plate that closes a first opening surface provided in the housing;
An annular sealing made of a fluororesin disposed on the periphery of the first opening surface and sandwiched between the glass plate and the housing;
A guide provided inside the housing and inserted by sliding the glass plate along the first opening surface;
A light projecting device comprising: a spacer which is slid along the first opening surface and is inserted into the guide and presses the glass plate against the first opening surface. The light projecting device according to claim 5 , wherein a welding rib is provided on each of the peripheral portion of the second opening and the peripheral portion of the lid, and is heat-welded after the light source body is assembled. In retroreflective mirror with a Rukatamitai a fluororesin for accommodating the reflection sheet for reflecting light,
The housing has a light transmission window through which detection light is transmitted provided on the front surface, a storage case in which a second opening for incorporating the reflection sheet is provided on a side surface, and a second case after incorporating the reflection sheet. It consists of a lid that seals the opening,
The light transmission window includes a glass plate that closes the first opening surface provided in the housing;
An annular sealing made of a fluororesin disposed on the periphery of the first opening surface and sandwiched between the glass plate and the housing;
A retroreflective mirror for a photoelectric sensor, comprising a spacer that is slid along the first opening surface and is inserted into the housing and presses the glass plate against the first opening surface. 8. The photoelectric sensor for a photoelectric sensor according to claim 7 , wherein a welding rib is provided in each of a peripheral portion of the second opening and a peripheral portion of the lid, and is heat-welded after the reflection sheet is assembled. Retroreflective mirror. A reflective sheet that reflects light;
A housing made of fluororesin and storing the reflective sheet;
In the retroreflective mirror provided on the front surface of the housing and having a light transmission window that transmits the detection light,
The housing is provided with a storage case provided with the light transmission window on the front surface and an opening for incorporating a reflection sheet on the back surface,
It consists of a lid that seals the opening after incorporating the reflective sheet,
The light transmissive window is a glass plate that closes an opening surface for the light transmissive window provided in the storage case;
It is arranged at the periphery of the opening surface, and consists of an annular sealing made of a fluororesin sandwiched between the glass plate and the storage case,
A retroreflective mirror for a photoelectric sensor, wherein the lid is attached by pressing the glass plate against an opening surface for a light transmission window.

Images