JP4770887B2 - Automatic switch with hot wire sensor - Google Patents

Description

  The present invention relates to an automatic switch with a heat ray sensor that detects the presence or absence of a person by detecting a heat ray emitted from a human body and controls a load.

  2. Description of the Related Art Conventionally, there is provided an automatic switch with a heat ray sensor that includes a heat ray sensor that detects the presence or absence of a person by detecting a heat ray radiated from a human body and controls a load according to the output of the heat ray sensor. This type of automatic switch with a heat ray sensor is used for control such that, for example, when the load is illumination, the illumination is turned on when a person enters the room and the illumination is turned off when the person leaves the room.

  Hereinafter, a conventional example of this type of automatic switch with a heat ray sensor will be described with reference to the drawings. However, in the following description, the top and bottom in FIG. This conventional example is attached to the ceiling, and as shown in FIG. 7, the flange 11 and the center of the rear surface of the flange 11 contact the lower surface of the peripheral portion of the mounting hole (not shown) formed on the ceiling. A housing A including a body 1 having a cylindrical portion 10 projecting from a portion and a cover 2 having a bottomed cylindrical shape with an open front surface and being closed by being coupled to the cylindrical portion 10. . Four assembly pieces 10a project from the rear end of the cylindrical portion 10, and an assembly protrusion 20 projecting from the outer peripheral surface of the front end portion of the cover 2 is engaged with an assembly hole 10b penetrating the assembly piece 10a. By doing so, the body 1 and the cover 2 are coupled.

  In the housing A, for example, a spherical lens block 100 in which a heat ray sensor TP composed of an infrared detection element such as a pyroelectric element is housed, and a relay SW that is turned on / off according to the output of the heat ray sensor TP are mounted. 1 printed wiring board P1, a changeover switch (not shown) for setting the operation of the relay SW, a variable resistor (not shown) for setting the sensitivity of the heat ray sensor TP, etc. are manually operated. A second printed wiring board P2 on which an element having a handle is mounted is accommodated. Here, the second printed wiring board P2 is fixed on the rear side of the lens block 100 with the mounting surface facing forward, and the handle can be operated from the front of the body 1. The first printed wiring board P1 is fixed on the rear side of the second printed wiring board P2 with the mounting surface facing rearward.

  On the first printed wiring board P1, in addition to the relay SW, three terminal portions 6 for connecting the relay SW and an electric wire (not shown) are mounted. The terminal portion 6 is a so-called quick connection terminal, and is provided on the cover 2 and two terminal plates 60 which are mounted on the first printed wiring board P1 adjacent to each other and electrically connected to the relay SW. Two locking springs 61 for locking the electric wires inserted through the electric wire insertion holes 21 between the terminal plate 60 and a jig such as a minus driver inserted from the release hole 22 provided in the cover 2. And a release button 62 for releasing the lock by simultaneously pressing the two lock springs 61 when pressed. If one of the terminal portions 6 is connected to a power source side electric wire and the other one terminal portion 6 is connected to a load side electric wire, power supply from the power source to the load is performed by the relay SW. Can be turned on / off. The remaining one terminal portion 6 is connected to a conventionally known heat ray sensor slave (not shown).

  The lens block 100 includes a substantially hemispherical condensing lens 101 that condenses heat rays from the detection range on the light receiving surface of the heat ray sensor TP, a substrate P3 on which the heat ray sensor TP is mounted, and a substrate P3 attached to the inside. The rotating frame 102 is formed in a substantially hemispherical shape that is coupled to the condenser lens 30 to form a spherical shape, and a substantially annular holding frame 103 that covers a coupling portion between the condenser lens 101 and the rotating frame 102. A window hole (not shown) that communicates with the cylinder portion 10 and exposes the condenser lens 101 is provided in the center portion of the flange portion 11 in the front-rear direction. Further, on the rear side of the lens block 100, an intermediate portion of the holding metal fitting 110 whose both ends are screwed to the flange portion 11 with mounting screws 111 is located. A coil spring 112 that biases the lens block 100 in a direction of pressing the lens block 100 against the flange portion 11 is inserted between the presser fitting 110 and the lens block 100. Furthermore, a substantially cylindrical shaft portion 102a protrudes from two locations across the opening on the outer surface of the rotating frame 102, and the shaft portion 102a is formed at two locations across the window hole on the rear surface of the flange portion 11. By being housed in a recess (not shown) communicating with the window hole, the lens block 100 is rotatable about the shaft portion 102a. Thus, the detection range can be changed by rotating the lens block 100 and changing the direction of the condenser lens 101.

  Further, on both sides of the cylinder portion 10 on the rear surface of the flange portion 11, a clamp 7 for fixing the housing A with the ceiling construction material sandwiched between the flange portion 11 is attached. The sandwiching bracket 7 has a substantially rectangular parallelepiped shape whose one side face is opposed to the cylinder part 10 in the front-rear direction, and has a guide part 70 whose one side face away from the cylinder part 10 is opened, A tightening screw 71 penetrating both ends in the longitudinal direction, and a pinching piece 72 that is partly housed in the guide portion 70 and screwed into the tightening screw 71 inside the guide portion 70 are provided.

  A notch 70 a communicating with the opening is provided at the rear end of one side surface adjacent to the opening surface of the guide portion 70. The clip piece 72 can be inserted into the notch 70a when the clip piece 72 is positioned at the rear end of the guide portion 70, and when the tightening screw 71 is rotated from the state in which the clip piece 72 is inserted into the cutout 70a, The sandwich piece 72 comes out of the notch 70 a and moves forward along the opening surface of the guide portion 70. The tightening screw 71 can be rotated by inserting a driver through a through hole 11a provided in the flange portion 11, and the tightening screw 71 is in a state where the rear surface of the flange portion 11 is in contact with the ceiling surface. When 71 is rotated, the pinching piece 72 moves out of the notch 70 a and moves in a direction approaching the flange portion 11, and the ceiling construction material can be pinched between the pinching piece 72 and the flange portion 11.

  In addition, in the vicinity of the portion to which the clamp member 7 of the flange portion 11 is attached, a screw for directly attaching the flange portion 11 to the ceiling or an embedding box (not shown) embedded in the ceiling surface. A screw insertion hole 11b is inserted through the screw to be coupled. Further, the decorative plate 5 that covers the flange portion 11 is attached to the housing A between the ceiling surface and the appearance is improved by covering the screw insertion hole 11b of the flange portion 11 and the like. The decorative plate 5 has a through hole 50 through which the lens block 100 is exposed.

By the way, in the above conventional example, since the thickness dimension of the presser fitting 110 is large, the space in which the lens block 100 is accommodated is pressed, and as a result, the lens block 100 protrudes greatly forward (downward) from the decorative plate 5. There was a problem. In view of this, Patent Document 1 discloses a structure in which the above-mentioned problem is solved by using a pressing metal member 110 as a plate-like spring member.
JP 2005-135613 A

However, in the conventional example described in Patent Document 1, since the heat ray sensor TP is not fixed inside the lens block 100, the light receiving surface of the heat ray sensor TP and the condensing lens as the lens block 100 moves in the vertical direction. There is a problem that the distance to the terminal 101 fluctuates and the detection range is not constant.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an automatic switch with a heat ray sensor that can suppress the protruding amount of the lens block and can keep the detection range constant.

In order to achieve the above object, a first aspect of the present invention provides a heat ray sensor for detecting a heat ray emitted from a human body, a relay for turning on / off a power supply from a power source according to an output of the heat ray sensor, and a heat ray sensor. A lens block having a condensing lens for condensing the heat rays from the detection range to the light receiving part of the heat ray sensor, and a lens block having a window hole for exposing the condensing lens to change the detection range And a printed wiring board mounted with electronic components such as a relay housed in the housing and covering the lens block, the housing on the ceiling surface An automatic switch with a heat ray sensor that is embedded, and a plate-shaped spring member that urges the lens block toward the window hole is provided between the lens block and the printed wiring board. Is, the spring member, the insertion hole exposing a portion of the outer peripheral surface of the lens block is formed through the outer peripheral surface exposed from the through hole of the lens block protrudes through the insertion hole A protrusion is provided, and the printed wiring board is disposed in a position close to the protrusion and in contact with the protrusion when an external impact is applied to the lens block .

In order to achieve the above object , the invention according to claim 2 is a heat ray sensor for detecting a heat ray emitted from a human body, a relay for turning on / off a power supply from a power source according to an output of the heat ray sensor, and a heat ray sensor. A lens block having a condensing lens for condensing the heat rays from the detection range to the light receiving part of the heat ray sensor, and a lens block having a window hole for exposing the condensing lens to change the detection range And a printed wiring board on which electronic parts such as a relay are mounted so as to cover the lens block, and the housing is embedded in the ceiling surface. A heat ray sensor-equipped automatic switch, and between the lens block and the printed wiring board, a plate-like spring member for urging the lens block toward the window hole is provided, The thread member has an insertion hole that exposes a part of the outer peripheral surface of the lens block, and an outer peripheral surface exposed from the insertion hole of the lens block has a protrusion protruding through the insertion hole. The printed wiring board is provided with a spacer that faces the protrusion and protrudes toward the lens block. The spacer has one end that faces the protrusion close to the protrusion and the lens. The block is disposed at a position where it comes into contact with the protrusion when an impact is applied from the outside.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the spring member extends along the circumferential direction of the first plate portion that contacts the lens block and the first plate portion, and is separated from the first plate portion. And one or more disposed along the circumferential direction of the first plate portion and the second plate portion between the second plate portion provided between the first plate portion and the second plate portion. Each elastic portion is characterized in that one end is connected to the first plate portion and the other end is connected to the second plate portion.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the housing includes a plurality of attachment portions provided along the circumferential direction of the spring member and fitted with the outer peripheral edge of the spring member. A mounting rib is provided that contacts the spring member when the spring member is fitted to the mounting portion.

The invention of claim 5 is the invention of any one of claims 1 to 4 , wherein the housing includes a plurality of positioning ribs provided along the circumferential direction of the spring member and in sliding contact with the outer periphery of the spring member. It is characterized by.

The invention of claim 6 is characterized in that, in the invention of claim 5 , at least three positioning ribs are provided, and a lead-out port for a lead wire drawn from the heat ray sensor is provided between the two ribs.

A seventh aspect of the invention is the lens block according to any one of the first to sixth aspects of the invention, wherein the lens block is formed by coupling the opening surfaces of the first frame body and the second frame body each having an opening on one surface thereof. A rotating frame and a substrate that is housed in the rotating frame and on which the heat ray sensor is mounted, the substrate is fixed to one of the frames, and the other frame is opposed to the light receiving part of the heat ray sensor A condensing lens is provided, a rib for placing the substrate is provided on the one frame body, and a dowel is provided at a portion facing the substrate in the other frame body.

According to the first aspect of the present invention, the spring member for urging the lens block is formed in a plate shape, so that the lens block and the printed wiring board are compared with the case where the lens block is urged by the pressing metal as in the prior art. The space to be secured between the lens block and the lens block is retracted toward the printed wiring board, and the amount of the lens block protruding from the window hole can be reduced. Further, since the heat ray sensor is fixed in the lens block, the lens block can be biased without changing the distance between the heat ray sensor and the condenser lens . Further, since the movement of the protrusion of the lens block is restricted by the inner peripheral edge of the insertion hole of the spring member, the rotation range of the lens block can be restricted. In addition, when an external force is applied to the lens block and the spring member is pressed in the direction opposite to the urging direction, the lens block is pressed more than necessary by the projection of the lens block coming into contact with the printed wiring board. Therefore, it is possible to prevent the spring member from being plastically deformed by applying an excessive stress to the spring member .

According to the invention of claim 2 , when an external force is applied to the lens block and the spring member is pressed in the direction opposite to the biasing direction, the lens block is pressed more than necessary by contacting the spacer. Therefore, it is possible to prevent the spring member from being plastically deformed by applying an excessive stress to the spring member.

According to the invention of claim 3 , the elastic portion can be lengthened by arranging the elastic portion along the circumferential direction of the first plate portion and the second plate portion, and an external force is applied to the lens block. When the spring member is pressed in the direction opposite to the biasing direction, the spring member can be sufficiently bent in the pressing direction. Therefore, it is possible to prevent the rotation of the lens block from being hindered due to insufficient bending of the spring member.

According to the fourth aspect of the present invention, when the spring member is fitted to the mounting portion and attached, the spring member can abut on the mounting rib to restrict the movement of the spring member. The workability can be improved.

According to the invention of claim 5 , since the outer periphery of the spring member is in sliding contact with the positioning rib when the spring member is attached to the housing, the spring member can be easily positioned.

According to the sixth aspect of the present invention, when the spring member is formed, the edge remaining on the outer peripheral edge of the spring member can be prevented from coming into contact with the lead wire of the heat ray sensor, so that the lead wire comes into contact with the edge. Can prevent damage.

According to the seventh aspect of the present invention, when assembling the rotating frame, the dowels can be brought into contact with the substrate and crushed to absorb the difference in the dimensions of each component. Therefore, the light receiving portion of the heat ray sensor mounted on the substrate And the distance between the condensing lens can be kept substantially constant.

  Embodiments of an automatic switch with a heat ray sensor according to the present invention will be described below with reference to the drawings. However, since the basic configuration of the present embodiment is almost the same as that of the conventional example, components having the same function are denoted by the same reference numerals and description thereof is omitted even if there is a slight difference in shape. In the following description, the vertical direction is defined as the front-rear direction in FIG. 1, but in the actual use state embedded in the ceiling, the front (upper in FIG. 1) is lower and the rear (lower in FIG. 1). It becomes upper. In the present embodiment, as shown in FIG. 1, the lens block 3 is elastically supported rotatably by a spring member 4 formed of a metal plate having elasticity instead of the presser fitting 110 and the coil spring 112 in the conventional example. There is a feature in that.

  The lens block 3 includes a condenser lens 30, a rotary frame that holds the condenser lens 30, and a substrate P3 on which the heat ray sensor TP is mounted and accommodated in the rotary frame. The condensing lens 30 has a lens portion 30a composed of a multi-divided lens in which a part of a spherical surface is divided in the circumferential direction and the radial direction, and a substantially cylindrical shape, and the opening on the front end side in the axial direction is closed by the lens portion 30a. The cylindrical portion 30b is integrally formed of a synthetic resin material. In addition, a pair of locking claws 30c project outwardly on the rear end side of the peripheral surface of the cylindrical portion 30b.

  As shown in FIG. 1 and FIG. 3 (b), the rotating frame is formed by joining the first frame body 31 and the second frame body 32, which are formed in a substantially hemispherical shape each having an opening on one surface, so as to abut each other. Configured. The first frame 31 has a substantially circular recess 31a in the center of the front surface, and a substantially circular window hole 31b is opened at the bottom of the recess 31a. A pair of locking recesses 31c are formed on the peripheral surface of the recess 31a to which the pair of locking claws 30c of the condenser lens 30 are locked. When the cylindrical portion 30b is fitted into the recess 31a, a pair is formed. The condensing lens 30 is attached to the first frame 31 in a state in which the locking claw 30c is locked with the locking recess 31c, and the lens portion 30a protrudes outside the recess 31a. The first frame 31 is provided with a pair of projecting pieces 31d projecting rearward, and a coupling claw 31e projecting outward is provided at the tip of each projecting piece 31d. Further, three protrusions 31f protrude from the inner peripheral surface of the first frame body 31 at substantially equal intervals in the circumferential direction, and rectangular parallelepiped protrusion ribs 31g protrude from the protrusions 31f. Has been.

  In the second frame 32, a substantially hemispherical spherical surface portion 32a and a substantially cylindrical peripheral wall portion 32b rising forward from the front end edge of the spherical surface portion 32a are integrally formed of a synthetic resin material. In addition, a substantially cylindrical protrusion 32c protruding rearward from the center of the spherical surface part 32a is provided. A plurality of ribs 32d on which the substrate P3 is placed protrudes from the inside of the second frame 32. Furthermore, a pair of engaging grooves 32e that engage with the pair of coupling claws 31e of the first frame 31 are provided on the inner peripheral surface of the peripheral wall portion 32b.

  Thus, if the first frame 31 is placed on the second frame 32 on which the substrate P3 is placed on the rib 32d, the coupling claw 31e provided on the projecting piece 31d of the first frame 31 is provided. Engages with an engaging groove 32d provided in the peripheral wall portion 32b of the second frame 32, and the first frame 31 and the second frame 32 are coupled so that the opening surfaces of the first frame 31 and the second frame 32 abut each other. A rotating frame is assembled. At this time, the substantially conical dowel 31h projecting from the rear end face of the three projecting ribs 31g of the first frame body 31 comes into contact with the substrate P3 and is crushed. That is, since the first frame body 31 and the second frame body 32 are coupled by the engagement of the coupling claw 31e and the engagement groove 32e, the first frame body 31 and the second frame body 32 are connected to each other. Further, the back and forth rattling caused by the dimensional error of each part occurs, and it becomes difficult to keep the distance between the light receiving part of the heat ray sensor TP and the lens part 30a constant. However, in the present embodiment, when the rotating frame is assembled as described above, the dowel 31h can be brought into contact with the substrate P3 and crushed to absorb the difference in the dimensions of each component, so that the heat ray mounted on the substrate P3. The distance between the light receiving part of the sensor TP and the lens part 30a can be kept constant. In the present embodiment, ribs for placing the substrate P3 are provided on the second frame 32 and dowels 31h are provided on the first frame 31, but conversely, the substrate P3 is provided on the first frame 31. A similar effect can be obtained by providing a rib for mounting the dowel and a dowel on the second frame 32. In addition, one end of a lead wire 200 for supplying power to the heat ray sensor TP and outputting from the heat ray sensor TP is soldered to the substrate P3, and the rotating frame is passed through the electric wire insertion hole 33 provided in the peripheral portion of the rotating frame. Has been pulled out of.

  As shown in FIG. 2, the spring member 4 has a substantially annular first plate portion 40 in which a circular insertion hole 40 a passes through the center portion, and a first plate portion 40 along the circumferential direction of the first plate portion 40 and the first plate portion 40. A substantially annular second plate portion 41 provided apart from the plate portion 40, and the first plate portion 40 and the second plate portion between the first plate portion 40 and the second plate portion 41. A plurality of (in the figure, four) long plate-like elastic portions 42 arranged along the circumferential direction of 41 are integrally formed by punching a plate-like metal material. The four elastic portions 42 have one end connected to the first plate portion 40 and the other end connected to the second plate portion 41.

  The first plate portion 40 and the second plate portion 41 are formed concentrically with each other, and the first plate portion 40 is surrounded by the second plate portion 41 with a gap. The elastic portions 42 have the same shape and are provided with a position shifted by approximately 90 degrees in the circumferential direction between the first plate portion 40 and the second plate portion 41 and extend in the circumferential direction. It is formed in a long and thin arc shape. By forming the elastic portion 42 in this way, the elastic portion 42 is longer than the length of the elastic portion 42 formed in the radial direction of the first plate portion 40 and the second plate portion 41. Can be lengthened and greatly deformed within the elastic limit. Further, four holding pieces 41 a are formed by cutting and raising in the thickness direction on the outer peripheral edge of the second plate portion 41.

  As shown in FIG. 4A, a substantially cylindrical lens block storage portion 12 that rotatably stores the lens block 3 is provided on the periphery of the window hole 11 c inside the cylinder portion 10. On the inner peripheral surface of the lens block storage portion 12, a pair of vertical grooves 12a whose rear ends (upper ends in FIG. 4A) are opened are formed at positions facing each other across the center of the window hole 11c. On the other hand, a pair of cylindrical convex portions 32f project outwardly from the rotating frame (second frame body 32) of the lens block 3, and the pair of convex portions 32f are respectively fitted in the longitudinal grooves 12a.

  A plurality (four in the illustrated example) of projecting portions 13 that are taller than the lens block storage portion 12 are provided so as to protrude rearward around the lens block storage portion 12 inside the tube portion 10. At the rear end portions (upper end portions in FIG. 4A) of these four protruding portions 13, mounting portions 13a into which the four holding pieces 41a of the spring member 4 are respectively fitted are recessed.

  Thus, a pair of convex portions 32f projecting from the second frame body 32 are fitted into the vertical grooves 12a, and the condensing lens 30 is projected from the window hole 11c so that the lens block storage portion 12 has a lens. After housing the block 3, the protrusion 32 c of the second frame 32 is inserted into a circular insertion hole 40 a penetrating through the central portion of the first plate portion 40, and provided on the second plate portion 41 4. When the two holding pieces 41a are respectively fitted to the mounting portions 13a, the lens block 3 is elastically held between the peripheral portion of the window hole 11c inside the cylindrical portion 10 and the spring member 4 so as to be freely rotatable. Become. However, the rotation range of the lens block 3 is restricted by the inner peripheral edge of the insertion hole 40a through which the protrusion 32c of the second frame 32 is inserted. The lens block storage portion 12 is formed with a substantially rectangular insertion groove 12b, and the lead wire 200 drawn out from the rotating frame of the lens block 3 is inserted into the insertion groove 12b so as to be outside the lens block storage portion 12. To the second printed wiring board P2 (see FIG. 4C).

  Here, when the four holding pieces 41a of the spring member 4 are respectively fitted to the mounting portion 13a, it is usually difficult to fit the four holding pieces 41a at the same time. Only 41a is fitted at the same time. However, in a state where at least one holding piece 41a is fitted to the mounting portion 13a, the first plate portion 40 abuts against the lens block 3 and is elastically deformed, so that the holding piece 41a in the spring member 4 is fitted. Since the side which is not lifted up, there is a possibility that the operation of fitting the remaining holding piece 41a to the mounting portion 13a may be difficult. On the other hand, in the present embodiment, as shown in FIG. 4B, the rear end surface of the lens block housing portion 12 is located in the vicinity of the spring member 4 after the attachment, so that at least one holding piece 41a is attached. When the remaining holding piece 41a is fitted to the mounting portion 13a while being fitted to the portion 13a, the second plate portion 41 comes into contact with the rear end surface of the lens block housing portion 12 to lift the spring member 4 up. Can be suppressed. As a result, it is possible to improve workability when the four holding pieces 41a are fitted to the mounting portion 13a. In this embodiment, the lens block storage portion 12 corresponds to an “attachment rib” in claim 6.

  In addition, a plurality of (three in the illustrated example) positioning ribs 14 that are taller than the lens block storage portion 12 project rearwardly around the lens block storage portion 12 inside the cylinder portion 10. . These positioning ribs 14 are formed in a substantially truncated cone shape that tapers backward. Therefore, when the holding piece 41a of the spring member 4 is fitted to the mounting portion 13a as described above, the outer peripheral edge of the second plate portion 41 is in sliding contact with the positioning ribs 14 so that the spring member 4 is easily positioned. be able to.

  Here, two of the three positioning ribs 14 are disposed in the vicinity of both ends in the circumferential direction of the insertion groove 12 b provided in the lens block storage portion 12. As already described, since the spring member 4 is formed by punching a plate-shaped metal material, a plurality of edge portions are formed on the outer peripheral edge of the second plate portion 41 when being separated from the metal material (metal plate). 41b remains (see FIG. 2A). When these edge portions 41 b come into contact with the lead wire 200, there is a possibility that the outer portion of the lead wire 200 is damaged by the edge portion 41 b or the conductor of the lead wire 200 is cut. Therefore, in the present embodiment, as shown in FIG. 4C, the two positioning ribs 14 are arranged in the vicinity of both ends in the circumferential direction of the insertion groove 12 b provided in the lens block storage portion 12, and the lead wire 200 is connected to the spring member 4. The occurrence of the above-described problems is prevented by preventing contact with the edge portion 41b.

Thus, in the conventional example, as shown in FIG. 5B, the lens block 100 in which the heat ray sensor TP is housed is elastically urged by the presser fitting 110 and the coil spring 112, so that the lens block 100 is attached to the decorative plate 5. Projecting forward (downward). On the other hand, in this embodiment, the lens block 3 protrudes forward from the decorative plate 5 because the lens block 3 is elastically biased by the plate-like spring member 4 as shown in FIG. The amount can be greatly reduced. Moreover, in the present embodiment, unlike the conventional example described in Patent Document 1, the lens block 3 having the heat ray sensor TP fixed therein is elastically urged by the spring member 4 so as to be rotatable. Even if 3 is rotated, the relative positional relationship between the condenser lens 30 and the heat ray sensor TP does not change. As a result, the detection range of the heat ray sensor TP can be kept substantially constant regardless of the rotation position of the lens block 3.

  By the way, since the spring member 4 elastically supports the first plate portion 40 with the long plate-like elastic portion 42, for example, when the lens block 3 is pressed in the counter-biasing direction by an impact applied from the outside, There is a risk that the elastic portion 42 may be plastically deformed by applying more stress than necessary. Therefore, in the present embodiment, as shown in FIG. 5A, the second printed wiring board P2 is disposed at a position close to the protrusion 32c provided on the second frame 32 of the lens block 3. . Therefore, even when the lens block 3 is pressed in the counter-biasing direction by an externally applied impact as described above, the lens block 3 is more than necessary because the protrusion 32c contacts the second printed wiring board P2. As a result, it is possible to prevent the elastic member 42 from being plastically deformed due to an unnecessarily stress applied to the spring member 4.

  Here, in the case where only one printed wiring board P1 is accommodated in the housing A, the printed wiring board P1 cannot be brought close to the lens block 3. Therefore, as shown in FIG. What is necessary is just to arrange | position the spacer 15 which consists of goods in proximity to the protrusion 32c of the lens block 3. FIG. The spacer 15 is formed by integrally forming a substantially cylindrical main portion 15a and a substantially cylindrical fixed portion 15b having a smaller diameter than the main portion 15a as a synthetic resin molded product. A circular through hole 201 is provided at the center of the printed wiring board P1, and the spacer 15 is fixed to the printed wiring board P1 by press-fitting the fixing portion 15b. At this time, the main portion 15a of the spacer 15 and the protrusion 32c of the lens block 3 are close to each other with a slight gap. Therefore, even when the lens block 3 is pressed in the counter-biasing direction due to an externally applied impact as described above, the lens block 3 is more than necessary because the protrusion 32c contacts the spacer 15 (main portion 15a). As a result, it is possible to prevent the elastic member 42 from being plastically deformed due to an unnecessarily stress applied to the spring member 4.

1 shows an embodiment of the present invention, (a) is an overall perspective view, (b) is an exploded perspective view. (A) is a top view of the spring member same as the above, (b) is a perspective view of a spring member and a lens block. (A) is a perspective view of the 1st frame body same as the above, (b) is sectional drawing of a lens block. (A) is a perspective view of the body in the same as above, (b) is a cross-sectional view of relevant parts of the body, lens block, and spring member in the same as above, and (c) is a perspective view of relevant parts of the body, lens block, and spring member in the same as above. . (A) is sectional drawing same as the above, (b) is sectional drawing of a prior art example. It is sectional drawing which shows the other structure same as the above. It is a disassembled perspective view which shows the conventional automatic switch with a heat ray sensor.

Explanation of symbols

A housing 1 body 2 cover 3 lens block 4 spring member 30 condenser lens 31 first frame 32 second frame TP heat ray sensor P3 substrate

Claims (7)

The heat ray sensor that detects the heat rays emitted from the human body, the relay that turns on / off the power supply from the power source according to the output of the heat ray sensor, the heat ray sensor is fixed internally, and the heat rays from the detection range are A lens block having a condensing lens for condensing on the light receiving unit, a housing having a window hole for exposing the condensing lens and rotatably holding the lens block so as to change a detection range; and An automatic switch with a heat ray sensor, including one or more printed wiring boards mounted with electronic components such as relays arranged to cover the lens block, and a housing embedded in the ceiling surface, between the lens block and the printed circuit board, a plate-shaped spring member for urging the lens block window hole side is provided on said spring member, said lens block An insertion hole for exposing a part of the outer peripheral surface is provided, and a protrusion projecting through the insertion hole is provided on the outer peripheral surface exposed from the insertion hole of the lens block, and the printed wiring board protrudes. An automatic switch with a heat ray sensor, wherein the automatic switch is disposed at a position close to the projection and in contact with the projection when an impact is applied to the lens block from the outside . The heat ray sensor that detects the heat rays emitted from the human body, the relay that turns on / off the power supply from the power source according to the output of the heat ray sensor, the heat ray sensor is fixed internally, and the heat rays from the detection range are A lens block having a condensing lens for condensing on the light receiving unit, a housing having a window hole for exposing the condensing lens and rotatably holding the lens block so as to change a detection range; and An automatic switch with a heat ray sensor having a printed wiring board on which electronic components such as a relay are mounted so as to cover the lens block, and a housing is embedded in the ceiling surface. A plate-shaped spring member that biases the lens block toward the window hole is provided between the wiring board and the spring member. Insertion hole for exposing the is formed through the outer peripheral surface exposed from the through hole of the lens block, the protrusion protruding through the through hole is provided on the printed wiring board, projections facing And a spacer that protrudes toward the lens block is provided, and the spacer has an end opposite to the protrusion that is close to the protrusion and receives an impact from the outside on the lens block. a heat ray automatic switch with sensor characterized in that it is disposed at a position abutting. The spring member includes a first plate portion that comes into contact with the lens block, a second plate portion provided along the circumferential direction of the first plate portion and spaced from the first plate portion, and a first plate. Each elastic portion comprising one or more long plate-like elastic portions disposed along the circumferential direction of the first plate portion and the second plate portion between the first plate portion and the second plate portion. The automatic switch with a heat ray sensor according to claim 1, wherein one end is connected to the first plate portion and the other end is connected to the second plate portion . The housing includes a plurality of mounting portions provided along the circumferential direction of the spring member and fitted with the outer peripheral edge of the spring member, and mounting ribs with which the spring member abuts when the spring member is fitted into the mounting portion. The automatic switch with a heat ray sensor according to any one of claims 1 to 3, wherein the switch is provided. 5. The heat ray sensor-attached device according to claim 1 , wherein the housing includes a plurality of positioning ribs that are provided along the circumferential direction of the spring member and that are in sliding contact with the outer periphery of the spring member . Automatic switch. 6. The automatic switch with a heat ray sensor according to claim 5, wherein at least three positioning ribs are provided, and a lead wire outlet is formed between the two ribs to be drawn from the heat ray sensor. The lens block includes a rotating frame formed by coupling the opening surfaces of the first frame body and the second frame body, each of which has an opening on one surface, and a substrate on which the heat ray sensor is mounted inside the rotating frame. And a substrate is fixed to one of the frames, and a condensing lens is disposed on the other frame so as to face the light receiving portion of the heat ray sensor, and the substrate is placed on the one frame. The automatic switch with a heat ray sensor according to any one of claims 1 to 6 , wherein a rib is provided and a dowel is provided in a portion facing the substrate in the other frame body .

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