JP2005285501A - Photoelectric sensor, light projection device, and regression reflection type mirror for photoelectric sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric sensor enhancing workability in joining members made of fluororesin without decreasing chemical resistance, waterproofness, and oil resistance and to provide a light projecting device and a regression reflection type mirror for the photoelectric sensor, and to especially provide the photoelectric sensor capable of sufficiently heating a joining part without damaging a sensor main part assembled to the housing case when the housing case and a cover are joined. <P>SOLUTION: The photoelectric sensor has the housing made of fluororesin and housing the sensor main part 11, the housing comprises the housing case 4 in which a first opening for assembling the sensor main part 11 is installed on one surface and a rib 4a for welding is installed in the peripheral part of the first opening, and the cover 5 in which the rib 4a for welding is installed in the peripheral part, and after the sensor main part 1 is assembled to the inside of the housing case 4, the first opening is sealed, and the cover 5 is fit to the housing case 4 and the ribs 4a and 5a are welded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a photoelectric sensor, a light projecting device, and a retroreflective mirror for the photoelectric sensor. More specifically, the present invention relates to a storage case made of a fluororesin for storing a sensor body and a photoelectric sensor for heat-welding a lid. . In particular, the present invention relates to a retroreflective photoelectric sensor provided with a light transmission window for transmitting detection light to a storage case by a glass 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.

  Usually, the housing that houses the sensor body consists of a storage case with an opening for mounting the sensor body on one surface and a lid for sealing the opening, and the sensor body is built into the storage case. After that, it is necessary to heat-weld the storage case and the lid. Further, a cable tube made of a fluororesin for covering a cable extending from the sensor main body needs to be heat-welded to the storage case (for example, Patent Document 3).

  In general, a fluororesin is excellent in chemical resistance, but has a high melting point and low thermal conductivity. For this reason, the conventional photoelectric sensor as described above has a problem that it is not easy to perform a welding process when joining members made of a fluororesin. That is, since the thermal conductivity of the members to be joined is low, there is a problem that heating is not performed sufficiently. If heating is not sufficient at the joint location, the desired strength cannot be obtained or welding is insufficient. In particular, if welding is not sufficient at the joint, chemical resistance, water resistance, and oil resistance are reduced.

In addition, when the storage case and the lid are joined, if the heating is performed for a long time so that the joining portion is sufficiently heated, the sensor main body assembled in the storage case is damaged by heat.
Japanese Utility Model Publication No. 2-16537 JP-A-10-261350 No. 8-2892

  As described above, the conventional photoelectric sensor having chemical resistance has a problem that it is not easy to perform welding when joining the members made of fluororesin. Moreover, when joining a storage case and a lid | cover, there existed a problem that the sensor main body assembled | attached in the storage case was damaged with a heat | fever.

  The present invention has been made in view of the above circumstances, and a photoelectric sensor, a light projecting device, and a retroreflection for a photoelectric sensor that have improved workability without deterioration in chemical resistance, waterproofness, and oil resistance. An object is to provide a mold mirror. In particular, an object of the present invention is to provide a photoelectric sensor capable of appropriately performing heat welding when joining members made of a fluororesin. It is another object of the present invention to provide a photoelectric sensor that can sufficiently heat the joining portion without damaging the sensor body assembled in the housing case when the housing case and the lid are joined.

  Another object of the present invention is to provide a photoelectric sensor having improved optical characteristics without deteriorating chemical resistance, water resistance and oil resistance. Another object of the present invention is 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.

  The photoelectric sensor according to the present invention is made of a fluororesin and includes a housing that houses the sensor main body, the housing having a first opening for incorporating the sensor main body on one surface, and the first opening. A storage case provided with welding ribs on the periphery thereof, and a lid provided with welding ribs on the periphery, and sealing the first opening after the sensor body is assembled in the storage case; The lid is fitted into the storage case, and the rib of the lid and the rib of the storage case are heat-welded.

  In addition to the above-described configuration, the photoelectric sensor according to the present invention is configured such that the lid rib and the housing case rib are provided so as to protrude in the direction in which the lid is attached.

  In addition to the above-described configuration, the photoelectric sensor according to the present invention is configured such that the rib of the lid and the rib of the storage case are provided with the same thickness.

  In addition to the above configuration, the photoelectric sensor according to the present invention includes a light transmission window that is provided on a surface adjacent to the surface having the first opening in the storage case, and transmits the detection light. A glass plate that closes the second opening surface provided in the storage case, and an annular sealing made of a fluororesin disposed on the peripheral edge of the second opening surface and sandwiched between the glass plate and the storage case And a guide that is provided inside the storage case and that is inserted by sliding the glass plate along the second opening surface, and is inserted into the guide by sliding along the second opening surface, The glass plate is configured to include a spacer that presses the glass plate against the opening surface.

  The photoelectric sensor according to the present invention includes, in addition to the above configuration, a cable tube made of a fluororesin, covering a cable extending from the sensor body, and provided in the storage case. And an end portion of the cable tube and an end portion of the through hole are heat-welded from the inside of the storage case.

  The light projecting device according to the present invention is made of a fluororesin and includes a housing that houses a light source body, the housing having a first opening for incorporating the light source body on one surface, and the first opening. A storage case provided with welding ribs at the periphery of the opening, and a lid provided with welding ribs at the periphery, and sealing the first opening after the light source body is incorporated in the storage case The lid is fitted into the storage case, and the rib of the lid and the rib of the storage case are heat-welded.

  A retroreflective mirror for a photoelectric sensor according to the present invention comprises a housing made of a fluororesin and containing a reflective sheet for reflecting light, and the housing is a first for incorporating the reflective sheet on one surface. A storage case provided with an opening, and a welding rib provided on the periphery of the first opening, and a welding rib provided on the peripheral edge, and after incorporating the reflective sheet into the storage case The lid includes a lid that seals the first opening. The lid is fitted into the storage case, and the rib of the lid and the rib of the storage case are heat-welded.

  A retroreflective mirror for a photoelectric sensor according to the present invention includes, in addition to the above configuration, a light transmission window that is provided on a surface adjacent to the surface having the first opening in the storage case and transmits detection light. A light transmission window is formed from a glass plate that closes the second opening surface provided in the storage case, and a fluororesin that is disposed on a peripheral portion of the second opening surface and is sandwiched between the glass plate and the storage case. And a spacer that slides along the second opening surface and is inserted into the storage case and presses the glass plate against the opening surface.

  According to the photoelectric sensor, the light projecting device, and the retroreflective mirror for the photoelectric sensor according to the present invention, the ribs for welding are provided on the peripheral portion of the first opening and the peripheral portion of the lid, respectively. Workability can be improved without deteriorating chemical resistance, water resistance and oil resistance. That is, the lid is fitted into the storage case, and heat welding is performed on the ribs of the lid and the protruding portions of the ribs of the storage case, so that heat welding can be appropriately performed when the members made of fluororesin are joined together. In particular, the joint portion can be sufficiently heated without damaging the sensor main body assembled in the storage case.

  In addition, the cable tube made of fluororesin is inserted into the through hole provided in the storage case, and the cable tube and the end of the through hole are heat-welded from the inside of the storage case, so that the cable tube is attached to the storage case. Since it is attached, the workability can be improved without lowering the chemical resistance, water resistance and oil resistance. In particular, when joining members made of a fluororesin, the joint location can be sufficiently heated. Moreover, since heat welding is performed inside the storage case, the aesthetics outside the storage case can be improved.

  In addition, since the light transmission window is formed from the glass plate using a sealing made of a fluororesin, the optical characteristics can be improved without deteriorating the chemical resistance, waterproofness and oil resistance. In addition, the chemical resistance, waterproofness, and oil resistance can be improved without lowering the polarization of transmitted light when detection light passes through the housing.

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 a retroreflective mirror 3 and light for detection, and uses the retroreflective mirror 3. A photoelectric sensor 2 that receives reflected 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.

  FIGS. 2A and 2B are plan views showing an example of the details of the main part of the photoelectric sensor device of FIG. 1. FIG. 2A shows a housing made up of a storage case 4 and a lid 5. The appearance of the photoelectric sensor 2 is shown as viewed from the side, and FIG. 2B shows the appearance as viewed from the front. The photoelectric sensor 2 includes the sensor body, the storage case 4 provided with the above-described light transmission window 7 on the front surface, and the opening (first opening) for incorporating the sensor body on the side surface, and the sensor body. It consists of a lid 5 for sealing the first opening later.

  The storage case 4 is a casing formed in a box shape using a fluororesin, and the strength of the light transmission window 7 is provided at the periphery of the light transmission window opening (second opening) provided on the front surface. A window frame 6 for improvement is formed. That is, the light transmission window 7 is provided on the surface adjacent to the surface having the first opening in the storage case 4. A cable 9 for covering a cable extending from the sensor body is attached to the guide 9 provided at the rear part of the storage case 4.

  3, 4A and 4B are cross-sectional views of the photoelectric sensor of FIG. 2 cut along the line A1-A1, and FIG. 3 shows the internal state of the photoelectric sensor 2. FIG. FIG. 4A shows details of the main part B1, and FIG. 4B shows details of the main part B2.

  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.

  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 a glass plate 15 that covers the surface of the second opening 10, an annular sealing 14 made of a fluororesin sandwiched between the glass plate 15 and the storage case 4, and the glass plate 15 that faces the second opening 10. , And a spacer 16 that presses the glass plate 15 against the surface of the second opening 10.

  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 sealing 14 is a packing formed using a member having elasticity such as fluoro rubber, and is disposed on the peripheral edge of the second opening 10 surface.

  The guide 17 is a support guide means for the sealing 14, the glass plate 15, and the spacer 16, and is provided inside the storage case 4. The spacer 16 is inserted into the guide 17 by sliding along the surface of the second opening 10.

  That is, the light transmission window 7 is in a state where the glass plate 15 is pressed against the wall surface of the storage case 4 through the ceiling 14 by inserting the spacer 16 into the guide 17 after inserting the ceiling 14 and the glass plate 15 into the guide 17. Formed with. 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 first opening in a direction parallel to the surface of the second opening 10.

  The sealing case 14 is sandwiched between the glass plate 15 and the wall surface of the storage case 4, and the second 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.

  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 fluororesin, and is inserted into the guide 9 and attached.

  The guide 9 is a cylindrical holding means for holding the cable tube 8 in parallel with the direction in which the cable 12 is pulled out. The guide 9 is formed by projecting one end of the through hole 21 penetrating the storage case 4 toward the outside of the storage case 4.

  Here, it is assumed that a protruding portion 22 that protrudes toward the inside of the storage case 4 is provided at the other end of the through hole 21. The protrusion 22 is heated and melted when the cable tube 8 is attached to the guide 9. That is, after the cable tube 8 is inserted into the through hole 21, the cable tube 8 is fixed to the guide 9 when the end portion of the cable tube 8 and the protruding portion 22 are heat-welded from the inside of the storage case 4. In the welding of the cable tube 8 and the guide 9, the protruding portions of the cable tube 8 and the through hole 21 become the heating and melting region C1. For this reason, heatability improves and it can fully heat a junction location. In addition, since heat welding is performed from the inside of the storage case 4 and the joining portion is inside the storage case 4, the appearance on the outside of the storage case 4 can be improved.

  On the periphery of the first opening and the peripheral edge of the lid 5, welding ribs 4a and 5a are provided, 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 first opening.

  The lid 5 is a fitting type, and is welded and fixed in a state of being fitted in the storage case 4. That is, after the sensor main body 11 is assembled in the storage case 4, the lid 5 is fitted into the storage case 4, and the ribs 4a and 5a are heat-welded to complete the photoelectric sensor 2.

  Here, in order to improve heatability, the thickness of the ribs 4a and 5a shall be the same. That is, the protruding portion is formed so that the thickness W1 of the rib 4a and the thickness W2 of the rib 5a are equal (W1 = W2) in the direction perpendicular to the protruding direction. In the welding of the storage case 4 and the lid 5, the protruding portions of the ribs 4a and 5a become the heating and melting region C2. Since the joining location can be effectively heated from both sides, the heatability is improved and the joining location can be sufficiently heated and melted.

  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.

  Here, the fluororesin used for the photoelectric sensor 2 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. Each can be applied to the photoelectric sensor 2 alone 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. 6A and 6B are plan views showing an example of the operation of attaching the cable tube in the photoelectric sensor of FIG. 2. FIG. 6A shows a state before the cable tube 8 is installed in the guide 9. FIG. 6B shows a state seen from the front side in the state of FIG. FIG. 7 is a cross-sectional view of the photoelectric sensor of FIG. 6 cut along line A2-A2.

  First, the cable pipe 8 is inserted into the through hole 21 of the guide 9 by sliding along the pulling direction of the cable 12. At this time, the cable tube 8 is inserted into the guide 9 so that the distal end position of the cable tube 8 is aligned with the distal end position of the protruding portion 22 in the through hole 21.

  FIGS. 8A and 8B are plan views showing an example of the mounting operation of the cable tube in the photoelectric sensor of FIG. 2. In FIG. 8A, the cable tube 8 is inserted into the guide 9. The state seen from the side surface side is shown in the later state, and FIG. 8B shows the state seen from the front side. FIG. 9 is a cross-sectional view of the photoelectric sensor of FIG. 8 taken along line A3-A3.

  10 (a) and 10 (b) are plan views showing an example of the cable tube attachment operation in the photoelectric sensor of FIG. 2, and FIG. 10 (a) is inserted into the guide 9 using the heater D1. FIG. 10B shows a state where the cable pipe 8 is heat-welded to the storage case 4 as viewed from the side surface, and FIG. 10B shows a state when viewed from the front side. FIG. 11A is a cross-sectional view of the photoelectric sensor and the heater D1 of FIG. 10 cut along line A4-A4, and FIG. 11B shows details of the main part B3.

  After the cable tube 8 is inserted into the guide 9, the end portion of the cable tube 8 and the protruding portion 22 of the through hole 21 are heat-welded using the heater D1. The heater D <b> 1 is a heating unit that abuts the peripheral portion of the joining portion and heats and melts the joining portion when joining the members made of fluororesin.

  Here, in order to insert in the storage case 4 and to heat a joining location from the inner side of the storage case 4, a rod-shaped metal mold shall be used as the heater D1. Further, in order to effectively heat the end portion of the cable tube 8 and the protruding portion 22, a tip portion of the heater D <b> 1 is provided with a protruding portion D <b> 2 that protrudes in the central axis direction.

  The protrusion D2 is inserted into the cable tube 8 when heating the joining portion, and the end of the cable tube 8 is heated from the inner surface side of the cable tube 8, so that the shaft diameter becomes equal to the inner diameter of the cable tube 8. It is formed as follows. Further, the peripheral edge portion D3 of the central axis at the distal end portion of the heater D1 is formed to protrude in the central axis direction so as to be engaged with the end portion of the cable tube 8 and the protruding portion 22. That is, at the time of heating the joining portion, the heat treatment is performed so that the rush portion D2 and the peripheral edge portion D3 cover the end portion of the cable tube 8 and the protruding portion 22.

  In this way, when the cable tube 8 is attached to the guide 9 by heat welding, the light transmission window 7 is assembled to the storage case 4. In assembling the light transmission window 7, first, the sealing 14 is disposed on the peripheral edge of the second opening 10 surface in the storage case 4, and then the glass plate 15 and the spacer 16 are sequentially inserted into the guide 17. When the spacer 16 is assembled to the guide 17, the light transmission window 7 is completed.

  After the light transmission window 7 is completed, the sensor body 11 is assembled in the storage case 4. In assembling the sensor main body 11, first, the cable 12 extending from the sensor main body 11 is pulled out of the storage case 4 from the end of the cable pipe 8 in the storage case 4 via the cable pipe 8, and then the sensor main body 11. Is inserted into the storage case 4. Next, after the sensor body 11 is assembled, an operation of attaching the lid 5 to the storage case 4 is performed.

  FIG. 12 is a plan view showing an example of the lid attaching operation in the photoelectric sensor of FIG. 2. After the lid 5 is fitted into the storage case 4, the lid 5 is heated and welded to the storage case 4 using the heater E 1. A state of viewing the state from the side is shown. 13 is a cross-sectional view of the photoelectric sensor and heater of FIG. FIG. 14 is a diagram showing details of a main part B4 in the photoelectric sensor of FIG.

  After the lid 5 is fitted into the storage case 4, the ribs 4a and 5a are heated and welded using the heater E1. The heater E <b> 1 is a heating unit that abuts the peripheral portion of the joining portion to heat and melt the joining portion when joining the members made of fluororesin.

  Here, it is assumed that a plate-shaped mold is used as the heater E1 in order to heat the joining portion by bringing the peripheral portion of the joining portion and the heater E1 into contact with each other along the direction in which the lid 5 is attached. Further, in order to effectively heat the protruding portions of the ribs 4a and 5a, the heater E1 is provided with a contact portion E2 protruding. The abutting portion E2 has a cross-sectional shape in which a central portion is recessed in order to engage with the ribs 4a and 5a.

  In this way, when the lid 5 is attached to the storage case 4 by heat welding, the photoelectric sensor 2 is completed.

  Next, the configuration of the retroreflective mirror 3 in the photoelectric sensor device 1 will be described. In the retroreflective mirror 3, the light transmission window and the lid are attached in the same manner as in the photoelectric sensor 2.

  FIGS. 15A and 15B are plan views showing an example of the details of the main part of the photoelectric sensor device of FIG. 1, and FIG. 15A shows a housing made up of a storage case 31 and a lid 32. FIG. FIG. 15B shows a state where the retroreflective mirror 3 is viewed from the front side, and FIG. FIG. 16 is a cross-sectional view of the retroreflective mirror of FIG. 15 taken along line A5-A5, and shows the internal state of the retroreflective mirror 3. FIG.

  The retroreflective mirror 3 includes a reflection sheet 37 that reflects light, a storage case 31 provided with a light transmission window 3a on the front surface, and an opening (first opening) for incorporating the reflection sheet 37 on the side surface. And the lid 32 for sealing the first opening after the reflection sheet 37 is incorporated.

  The storage case 31 is a casing formed in a box shape using a fluororesin, and the strength of the light transmission window 3a is provided in the periphery of the light transmission window opening (second opening) provided on the front surface. A window frame 33 is formed for improvement. That is, the light transmission window 3a is provided on the surface adjacent to the surface having the first opening in the storage case 31.

  The reflection sheet 37 stored in the storage case 31 is a reflecting mirror formed by mold processing using acrylic resin or polycarbonate resin. In this reflection sheet 37, 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 37.

  In addition, the reflection sheet 37 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 37 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 3 a includes a glass plate 36 that covers the second opening 34 surface, an annular sealing 35 made of a fluororesin sandwiched between the glass plate 36 and the storage case 31, and the glass plate 36 on the second opening 34 surface. The spacer 38 is pressed against the spacer 38. The sealing 35 is a packing formed using a member having elasticity such as fluoro rubber, and is disposed at the peripheral edge of the second opening 34 surface. The spacer 38 is inserted into the storage case 31 by sliding along the surface of the second opening 34.

  The light transmitting window 3a is formed by inserting the reflective sheet 37 into the storage case 31 together with the spacer 38 after the sealing 35 and the glass plate 36 are inserted into the storage case 31, so that the glass plate 36 is inserted into the storage case 31 through the sealing 35. 31 is formed in a state of being pressed against the wall surface. That is, the light transmission window 3a is formed by sliding the sealing 35, the glass plate 36, the reflection sheet 37, and the spacer 38 into the storage case 31 from the first opening in a direction parallel to the surface of the second opening 34.

  The sealing case 35 is sandwiched between the glass plate 36 and the wall surface of the storage case 31, and the second opening 34 is closed while the glass plate 36 is pressed against the wall surface of the storage case 31 through the ceiling 35 by the spacer 38. The airtightness in 31 can be maintained.

  On the periphery of the first opening and the peripheral edge of the lid 32, welding ribs 31a and 32a are provided, respectively. The ribs 32 a are provided so as to protrude in the direction in which the lid 32 is attached, and are formed so as to surround the periphery of the lid 32. The rib 31a is provided in the storage case 31 so as to protrude in the attaching direction of the lid 32, and is formed so as to surround the first opening.

  The lid 32 is a fitting type, and is welded and fixed in a state of being fitted into the storage case 31. That is, after the reflective sheet 37 and the like are assembled in the storage case 31, the lid 32 is fitted into the storage case 31, and the ribs 31a and 32a are heat-welded to complete the regressive reflection type mirror 3.

  FIG. 17 is an exploded perspective view showing the configuration of the retroreflective mirror of FIG. In the retroreflective mirror 3, the light transmission window 3 a is formed by sliding the sealing 35, the glass plate 36, the reflection sheet 37, and the spacer 38 into the storage case 31. After forming the light transmission window 3a, the lid 32 is welded to the storage case 31, whereby the retroreflective mirror 3 is completed. The spacer 38 is provided with an engagement hole 38a for holding the reflection sheet 37 parallel to the surface of the second opening 34. The reflection sheet 37 is slid into the storage case 31 while being held in the engagement hole 38a.

  FIG. 18 is a plan view showing an example of the lid attaching operation in the retroreflective mirror of FIG. 15. After the lid 32 is fitted into the storage case 31, the lid 32 is attached to the storage case 31 using the heater F1. A state where the state of heat welding is viewed from the front side is shown. FIG. 19 is a cross-sectional view of the retroreflective mirror and heater of FIG.

  First, in the same manner as in the photoelectric sensor 2, the light transmission window 3 a is assembled to the storage case 31. After the assembly of the light transmission window 3a is completed, the lid 32 is fitted into the storage case 31, and the ribs 31a and 32a are heated and welded using the heater F1. In this way, when the lid 32 is attached to the storage case 31 by heat welding, the retroreflective mirror 3 is completed.

  According to the present embodiment, the lid is fitted into the storage case, and heat welding is performed at the rib of the lid and the protruding portion of the rib of the storage case. Therefore, the heat welding at the time of joining the members made of fluororesin is appropriately performed. Can be done. In particular, the joint portion can be sufficiently heated without damaging the sensor body 11 assembled in the storage case 4. Accordingly, the workability can be improved without lowering the chemical resistance, waterproofness and oil resistance.

  Since the light transmission window (glass window) made of the glass plate 15 is formed in the storage case 4 for storing the sensor body 11 using the sealing 14 made of fluororesin, the chemical resistance, waterproofness and oil resistance are lowered. In addition, the optical characteristics can be improved. In addition, the chemical resistance, waterproofness, and oil resistance can be improved without lowering the polarization of transmitted light when detection light passes through the housing.

  In addition, since the glass window can be assembled by sliding the sealing 14, the glass plate 15, and the spacer 16 from the first opening for incorporating the sensor main body 11, the assembling work can be simplified. Therefore, the processability in the sensor assembly process can be improved without deteriorating the chemical resistance, waterproofness and oil resistance.

  In the present embodiment, an example in which a light transmission window made of a glass plate is formed in the photoelectric sensor 2 and the retroreflective mirror 3 has been described, but the present invention is not limited to this, and The present invention can also be applied to a device that does not have a light transmission window.

  In this embodiment, an example in which a light transmission window is configured using a glass plate has been described. However, the present invention is not limited to this, and the optical characteristics are superior to those of fluororesin. A light transmissive window may be configured using a member. 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.

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 plan 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 composed of a storage case 4 and a lid 5. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 2 by the A1-A1 line | wire, and the mode in the inside of the photoelectric sensor 2 is shown. It is the figure which showed the detail in the principal part of the photoelectric sensor of FIG. FIG. 3 is an exploded perspective view showing a configuration of the photoelectric sensor of FIG. 2. It is the top view which showed an example of the attachment operation | movement of the cable pipe | tube in the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 6 by the A2-A2 line. It is the top view which showed an example of the attachment operation | movement of the cable pipe | tube in the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor of FIG. 8 by the A3-A3 line. It is the top view which showed an example of the attachment operation | movement of the cable pipe | tube in the photoelectric sensor of FIG. It is sectional drawing which cut | disconnected the photoelectric sensor and heater D1 of FIG. 10 by the A4-A4 line. It is the top view which showed an example of the attachment operation | movement of the lid | cover in the photoelectric sensor of FIG. It is sectional drawing of the photoelectric sensor and heater of FIG. It is the figure which showed the detail of the principal part B4 in the photoelectric sensor of FIG. FIG. 2 is a plan view showing an example of the details of the main part of the photoelectric sensor device of FIG. 1, and shows a retroreflective mirror 3 having a housing composed of a storage case 31 and a lid 32. It is sectional drawing which cut | disconnected the regression reflection type mirror of FIG. 15 by A5-A5 line | wire, and the mode inside the regression reflection type mirror 3 is shown. It is the disassembled perspective view which showed the structure in the regressive reflection type mirror of FIG. FIG. 16 is a plan view showing an example of a lid attaching operation in the retroreflective mirror of FIG. 15. FIG. 19 is a cross-sectional view of the retroreflective mirror and the heater in FIG. 18.

Explanation of symbols

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

Claims (10)

In a photoelectric sensor made of fluororesin and equipped with a housing that houses the sensor body,
The housing has a first opening for incorporating the sensor body on one surface, and a storage case provided with a welding rib in the periphery of the first opening;
A rib for welding is provided on the peripheral portion, and it comprises a lid that seals the first opening after the sensor body is assembled in the storage case,
A photoelectric sensor, wherein the lid is fitted into a storage case, and the rib of the lid and the rib of the storage case are heat-welded.   The photoelectric sensor according to claim 1, wherein the rib of the lid and the rib of the storage case are provided so as to protrude in a direction in which the lid is attached.   The photoelectric sensor according to claim 1, wherein the rib of the lid and the rib of the storage case are provided with the same thickness. A light transmission window that is provided on a surface adjacent to the surface having the first opening in the storage case and transmits the detection light;
The light transmission window includes a glass plate that covers the second opening surface provided in the storage case;
An annular sealing made of a fluororesin disposed on the peripheral edge of the second opening surface and sandwiched between the glass plate and the storage case;
A guide provided inside the storage case and inserted by sliding the glass plate along the second opening surface;
The photoelectric sensor according to claim 1, further comprising a spacer that is slid along the second opening surface and is inserted into the guide and presses the glass plate against the opening surface. A cable tube made of fluororesin and covering a cable extending from the sensor body;
Provided in the storage case, and provided with a through hole for inserting the cable pipe in a direction in which the cable is pulled out,
The photoelectric sensor according to claim 1, wherein an end of the cable tube and an end of the through hole are heat-welded from the inside of the storage case.   The photoelectric sensor according to claim 5, wherein the through hole is provided so as to protrude toward the inside of the storage case.   The photoelectric sensor according to claim 5, wherein the through hole is provided so as to protrude toward the outside of the storage case. In the light projecting device comprising a housing made of fluororesin and containing the light source body,
The housing is provided with a first opening for incorporating a light source body on one surface, and a storage case in which a welding rib is provided in the periphery of the first opening;
A rib for welding is provided on the peripheral portion, and it comprises a lid that seals the first opening after the light source body is incorporated in the storage case,
The light projection device, wherein the lid is fitted into a storage case, and the rib of the lid and the rib of the storage case are heat-welded. In a retroreflective mirror made of a fluororesin and equipped with a housing that houses a reflective sheet that reflects light,
The housing is provided with a first opening for incorporating a reflection sheet on one surface, and a storage case provided with a welding rib in the periphery of the first opening;
A rib for welding is provided on the peripheral edge, and the lid is configured to seal the first opening after the reflection sheet is incorporated into the storage case.
A retroreflective mirror for a photoelectric sensor, wherein the lid is fitted into a storage case, and the rib of the lid and the rib of the storage case are heat-welded. A light transmission window that is provided on a surface adjacent to the surface having the first opening in the storage case and transmits the detection light;
The light transmission window includes a glass plate that covers the second opening surface provided in the storage case;
An annular sealing made of a fluororesin disposed on the peripheral edge of the second opening surface and sandwiched between the glass plate and the storage case;
10. The retroreflection for a photoelectric sensor according to claim 9, comprising a spacer which is slid along the second opening surface and is inserted into the storage case and presses the glass plate against the opening surface. Type mirror.

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