JPH0669777U - Indoor mounted detector - Google Patents

Abstract

(57) [Abstract] [Purpose] The sensor can be correctly installed at the focal position of the lens without being affected by the lens assembly error, and the detection sensitivity is improved. [Structure] A wiring board 41B in which a sensor 40 is mounted is housed and arranged in an inner case 6. The lens 53 arranged in front of the sensor 40 is held by the lens holder 50, and the holder 50 is fixed in close contact with the wiring board 41B. The distance between the sensor 40 and the lens 53 is uniquely determined only by the dimensional accuracy of the lens holder 50, and is not affected by the assembly error of the lens 53.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an indoor-mounted detector that is embedded and installed in the ceiling, wall surface, etc. of buildings such as offices, hotels, and hospitals.

[0002]

[Prior art]

 Conventionally, in buildings, etc., various detectors such as temperature / humidity detectors, infrared detectors, and fire detectors are embedded in the ceiling and wall surfaces to control air conditioning and prevent theft and fire. . The most common mounting structure for this type of detector is to fit the case in which the sensor is mounted into a recess provided in the wall surface, and fix it with fastening means such as screws. No. 54550). As another method, for example, a mounting device disclosed in Japanese Utility Model Publication No. 3-42544 is also known. In this mounting device, a mounting bracket bent in a V shape is mounted on the back side of the case body with a set screw so that it can be raised and lowered, and the mounting bracket and the collar provided on the front of the case body are used for the ceiling. The case body is fixed by sandwiching the mounting surface of a plate or the like.

When such an indoor-mounted detector is a detector for detecting heat rays such as infrared rays and radiation rays, especially in the case where the detector is installed on the ceiling, if the heat ray detection direction has directivity, a blind spot may occur. In order to reduce the reliability as a detector, it is necessary to set the detection direction within the range of 360 °. Therefore, a compound eye lens is provided in front of the sensor, and infrared rays from all directions are guided to the sensor by this compound eye lens. The sensor is usually mounted on a wiring board and is incorporated in the case together with the wiring board so as to be positioned at the focal position of the lens.

[0004]

[Problems to be solved by the device]

 As described above, indoor detectors that detect heat rays such as infrared rays and radiant rays use a lens to guide heat rays from all directions to the sensor so that blind spots do not occur in the detection direction. However, in the past, the lens and the sensor were individually assembled in the case, so it was difficult to install the sensor properly from the focal position of the lens due to variations in assembly, etc., and there was the problem of low detection sensitivity. .

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to correctly install the sensor at the focal point position of the lens without being influenced by the assembly error of the sensor. Therefore, it is an object of the present invention to provide an indoor-mounted detector capable of improving the detection sensitivity.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has an outer case having an external terminal to which an external cord is connected and embedded in a wall surface, a ceiling, etc., and a sensor, a wiring board, an internal terminal, etc. And an inner case housed in the housing, a lens arranged in front of the sensor, and a lens holder that holds the lens and is closely fixed to the wiring board.

[0007]

[Action]

 In the present invention, the lens holder holds the lens and is closely fixed to the wiring board, so that the distance between the sensor and the lens is set and maintained at a predetermined distance, and the influence of the variability when the lens is assembled is eliminated.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. 1 is a sectional view showing an embodiment of an indoor-mounted detector according to the present invention, FIG. 2 is an exploded perspective view of the same detector, FIG. 3 is a rear view of an outer case, and FIG. 4 is IV-IV of FIG. FIG. 5 is a front view of the outer case, FIG. 6 is a rear view of the inner case, FIG. 7 is a cross-sectional view showing the mounting structure of the external terminal, FIG. 8 is a perspective view of the contact spring and the internal terminal, and FIG. It is a principal part sectional drawing of a wiring board. In these figures, in this embodiment, the presence / absence of a person in the room is detected by detecting the infrared rays emitted from the human body, etc., which are inserted into the mounting holes 2 provided in the ceiling plate 1 and are detected. The figure shows a case where the present invention is applied to a ceiling-mounted in-room detector 3 that controls lighting, lighting, and the like. As shown in FIGS. 1 and 2, such an in-room detector 3 is detachably attached to the outer case 5 and the inner case 6 having a double cylinder structure formed in two and the rear surface of the outer case 5. And a front cover 8 that is detachably attached to the front surfaces of the outer case 5 and the inner case 6.

The outer case 5 is integrally formed by injection molding of resin, and has a cylindrical main body 5 A having an outer diameter smaller than the hole diameter of the mounting hole 2 and a front surface open, and a main body 5 A flange portion 5B is provided so as to project from the outer peripheral surface of the front end portion of A and is brought into close contact with the indoor side surface 1a of the ceiling plate 1 through a packing 9, and a pair of engagement holes 10 and 11 (see FIG. ), A screw mounting hole 12 (FIGS. 1 to 5), six long holes 13 (FIG. 5) and an external terminal mounting portion 14 (FIGS. 2 to 4), respectively.

In FIG. 5, since the pair of engagement holes 10 and 11 lock the inner case 6, they are formed with a phase difference of 180 ° from each other, and each of them has a hook shape in a plan view. The case 5 includes radial holes 10a and 11a directed toward the center, and circumferential holes 10b and 11b connected to the inner ends of the radial holes 10a and 11a.

The screw mounting hole 12 (FIGS. 1 to 5) is formed in the center of the rear surface of the outer case 5, and a mounting screw 27 described later is rotatably penetrated from the inside of the outer case 5. Has been done.

The elongated holes 13 are formed long in the circumferential direction at predetermined intervals in the circumferential direction between the engagement holes 10 and 11.

The external terminal mounting portion 14 is mainly composed of a pair of mounting walls 14a and 14b that are arranged in parallel in a circumferential direction at regular intervals as shown in FIGS. On the inner side surfaces of these mounting walls 14a and 14b, support portions 17 for supporting the terminal fittings 16 of the external terminals 15 are integrally provided so as to project. Then, the external terminal mounting portions 14 are arranged so as to face each other with three imaginary lines 18 (FIGS. 3 and 5) passing through the center of the outer case 5 and connecting the pair of engagement holes 10 and 11 on both sides. In addition, the three external terminal mounting portions 14 on the same side are provided in close contact with each other.

As shown in FIGS. 3, 4, 7, and 8, the external terminal 15 is composed of the terminal fitting 16, a contact spring 19, and a screw 21 for connecting the external cord 20 to the terminal fitting 16. Has been done. The terminal fitting 16 is formed by bending a metal plate having an appropriate plate thickness, width and length by press working, and has a side view “he” shape having two substantially inclined surfaces 22a and 22b (FIG. 7). -Shaped central portion 16A, a horizontal base portion 16B extending to one end of the central portion 16A, a narrow portion 16C integrally extended to the other end of the central portion 16A and the end of the horizontal base portion 16B on the side opposite to the central portion, 16D and is disposed between the pair of mounting walls 14a and 14b, and both side edges of the central portion 16A are supported by the supporting portion 17, so that the contact spring together with the pair of mounting walls 14a and 14b. A storage space A (FIG. 7) for storing 19 is formed. The long side slope 22b of the central portion 16A forms a connection portion of the external cord 20 by screwing the screw 21 and connecting one end of the external cord 20. The narrow portions 16C and 16D provided at both ends of the terminal fitting 16 are inserted and locked from the rear into the locking holes 23 and 24 provided in the outer case 5, respectively. It is fixed to the terminal mounting portion 14.

In FIGS. 7 and 8, the contact spring 19 is formed into a shape as shown by bending a thin leaf spring, so that the contact point spring 19 has a plate-shaped base portion 19a and a portion forward of one end of the plate-shaped base portion 19a. An elastically deformable portion 19b bent substantially at a right angle, a bent portion 19c bent substantially at a right angle from the end of the elastically deformable portion 19b opposite to the plate-shaped base portion, and a bent portion 19c. It comprises a U-shaped terminal receiving portion 19d provided on the front side of the curved portion 19c so as to surround three sides, and a holding portion 19e which is provided in the terminal receiving portion 19d and elastically holds an internal terminal 25 described later. The plate-shaped base portion 19a is welded and fixed to the front surface of the horizontal base portion 16B of the terminal fitting 16, and the holding portion 19e is located in front of the central portion 16A of the terminal fitting 16 so as to correspond to the elongated hole 13. Therefore, when the terminal fitting 16 is attached to the external terminal attachment portion 14, the holding portion 19e is located in the storage space A and is protected from adhesion of dust and the like. The holding portion 19e is made up of four elastic pieces 119, two pairs of which are formed by bending the tip ends of the two opposite sides of the terminal receiving portion 19d inward, and a total of four elastic pieces 119 are formed. Holds 4 points elastically. The plate-shaped base portion 19a of the contact spring 19 thus formed is inserted and locked when the narrow portions 16C and 16D of the terminal fitting 16 are inserted into the locking holes 23 and 24 of the outer case 5, respectively. The elastically deformable portion 19b, the bent portion 19c, and the terminal receiving portion 19d, which are closely fixed to the pedestal 26 protrudingly provided on the rear surface of the outer case 5 and are connected to the plate-shaped base portion 19a, are provided on the rear surface of the outer case 5 and the pair. It is separated from the mounting walls 14a and 14b and is swingable. If the tip end side of the plate-shaped base portion 19a of the contact spring 19 is made swingable in this way, even if the manufacturing error of the outer case 5 and the inner case 6 and the positional deviation of the contact spring 19 and the inner terminal 25 are large, When the contact spring 19 and the internal terminal 25 are connected, the elastically deforming portion 19b elastically deforms in the direction of the arrow in FIG. 7 to swing the holding portion 19e, so that the above-mentioned error, misalignment, etc. can be effectively absorbed. Therefore, each elastic piece 119 can be brought into contact with the internal terminal 25 with a substantially equal contact pressure.

In FIGS. 1 and 2, the terminal cover 7 is formed in a cylindrical shape having an outer diameter substantially the same as the outer case 5 and an open front surface. Engaging claws 28 are integrally projected, and these engaging claws 28 are engaged with engaging recesses 29 formed at the rear end of the outer peripheral surface of the outer case 5. In this case, the positioning of the terminal cover 7 with respect to the outer case 5 is not required to be strict, and therefore, the engaging recesses 29 are equally arranged in the circumferential direction of the outer case 5, for example, six, and are formed by 180 °. Any two that face each other are provided for locking the terminal cover 7. A pair of external cord lead-out holes 30 are formed in the terminal cover 7. This external cord lead-out hole 30 is formed with a round hole portion 30a formed on the back surface of the terminal cover 7, and is formed over the entire circumferential surface in the axial direction so that one end is connected to the round hole portion 30a and the other end is connected to the terminal cover 7. And a slit portion 30b opened to the front opening of the. In this case, if the external cord lead-out hole is formed only by the round hole portion 30a, it is necessary to pass the outer cord 20 through the external cord lead-out hole and connect the external cord 20 to the external terminal 15 in advance. As described above, when the external cord lead-out hole 30 is formed in a long hole shape and one end thereof is opened to the front opening of the terminal cover 7, the external cord 20 is inserted into the terminal cover 7 through the slit portion 30b and a round hole is formed. Since it can be led out from the portion 30a, the terminal cover 7 can be attached to the outer case 5 even after the external cord 20 is connected to the external terminal 15. Therefore, it is not necessary to pass the external cord 20 through the external cord lead-out hole 30 in advance, and the user does not forget to pass the cord.

Further, a pair of guide holes 34a and 34b and inclined portions 35a and 35b are formed at the rear end portion of the outer peripheral surface of the terminal cover 7 with a phase difference of 180 °. The guide hole 34a and the inclined portion 35a and the guide hole 34b and the inclined portion 35b are formed at the same position, respectively. A cylindrical portion 36 through which the mounting screw 27 is rotatably pierced is integrally provided at the center of the inside of the terminal cover 7.

As shown in FIGS. 1, 2, 4 and 6, the inner case 6 has a cylindrical main body 6A having an open front surface which is fitted into the main body 5A of the outer case 5, and a front end of the main body 6A. When the main body 6A is properly fitted and inserted into the outer case 5, the back surface of the flange section 6B is brought into close contact with the front surface of the collar section 5B of the outer case 5. Is configured. At the center of the front surface of the collar portion 6B, a drainage mountain 37 (FIGS. 1 and 2) formed of an annular protrusion having a V-shaped cross section is integrally provided.

On the back surface of the inner case 6, the internal terminals 25 are provided so as to penetrate therethrough, and a pair of engaging portions 38, 39 are integrally provided so as to project. The internal terminals 25 are concentrically projected so as to correspond to the external terminals 15 of the outer case 5, and are formed integrally with the inner case 6 by insert molding. The engaging portions 38 and 39 are provided so as to project corresponding to the engaging holes 10 and 11 of the outer case 5, and are formed in an inverted L shape in a side view as shown in FIG. The inner case 6 includes vertical bases 38a and 39a extending rearward, and horizontal ends 38b and 39b extending outward from the inner case 6 at the ends of the vertical bases 38a and 39a. When they are inserted into the outer case 5, they are inserted into the radial holes 10a, 11a of the engaging holes 10, 11 as shown by the two-dot chain line in FIG. 5, and in this state, the inner case 6 is rotated clockwise in FIG. When rotated, the vertical bases 38a and 39a move to the circumferential holes 10b and 11b, and the horizontal parts 38b and 39b come into contact with and engage with the back surface of the outer case 5 to attach and detach the inner case 6 to and from the outer case 5. Fix as much as possible.

However, when the inner case 6 is rotated by 180 ° around the central axis and fitted into the outer case 5, different external terminals 15 and internal terminals 25 are connected to each other and the electric circuit is damaged, or as a detector. Since the radial holes 10a and 11a of the engaging holes 10 and 11 and the shapes of the engaging portions 38 and 39 are made different from each other, the radial holes 10a and the horizontal portion 38b of the engaging portion 38 are prevented from functioning normally. The radial hole 11a and the horizontal portion 39b of the engaging portion 39 are each formed into a similar trapezoid that can be fitted to each other into a similar rectangular shape that can also be fitted to each other, and the horizontal portion 38b of the engaging portion 38 is formed. Does not fit into the radial hole 11a.

When the horizontal portions 38b and 39b of the engaging portions 38 and 39 are respectively inserted into the radial hole portions 10a and 11a of the engaging holes 10 and 11 as shown by the two-dot chain line in FIG. The internal terminals 25 are inserted into the corresponding elongated holes 13 from the inside of the outer case 5 and project to the rear of the outer case 5. By rotating the inner case 7 in the clockwise direction, the projecting portions are shown in FIGS. 4 and 8. As described above, the contact springs 19 are inserted between the holding portions 19e and contact each other at four points, whereby the external terminals 15 and the internal terminals 25 are electrically and mechanically connected. Therefore, the mounting work of the inner case 6 to the outer case 5 and the electrical and mechanical connection work of the outer terminal 15 and the inner terminal 25 are simultaneously performed with one touch.

1, FIG. 2, FIG. 4 and FIG. 9, inside the inner case 6, a wiring board 41, etc., in which a sensor 40 is further mounted, is housed. The wiring board 41 is composed of two wiring boards 41A and 41B which are spaced apart from each other in the front and rear. The wiring board 41A located at the rear has land portions of the printed wiring pattern around both sides of the mounting screw holes. The land portion is brought into contact with the front surface of each of the internal terminals 25 and is fixed by screwing with a set screw 43. Therefore, a screw hole 44 (FIG. 9) into which the set screw 43 is screwed is formed on the inner end surface of the internal terminal 25. On the other hand, a screw mounting hole 45 is formed in the wiring board 41A so as to correspond to the screw hole 44. Therefore, when the wiring board 41A is brought into close contact with the inner end surface of the internal terminal 25 and the setscrew 43 is inserted into the screw mounting hole 46 and screwed into the screw hole 44, the wiring board 41A and the internal terminal 25 are stopped by the locking screw 43 and the land. It is electrically connected via the portion 46, and the connection by the lead wire is unnecessary. Further, as shown in FIG. 2, two positioning recesses 47 are formed in the peripheral portion of the wiring board 41A, and these recesses 47 are fitted to the screw mounting portions 48 protruding from the inner peripheral surface of the inner case 6. By doing so, erroneous incorporation of the wiring board 41A is prevented. On the other hand, the wiring board 41B located on the front side is fixed to the front surface of the screw mounting portion 48 together with a lens holder 50 which will be described later by a fastening screw 49, and the wiring board 41B located on the rear side by a lead wire 51 (FIG. 1). It is electrically connected to 41A. The sensor 40 is an infrared sensor and is arranged in the center of the front surface of the wiring board 41B.

The lens holder 50 is formed in a cylindrical body with both ends open, and a pair of screw mounting portions 52 having screw mounting holes through which the set screw 49 is inserted are formed on the inner surface of the rear end side opening portion. A dish-shaped lens 53 made of resin is fitted and fixed in the opening on the front end side. Therefore, the stepped surface 54 (FIGS. 1 and 4) that holds the outer peripheral edge of the lens 53 over the entire circumference and the outer peripheral edge of the lens 53 are locked to the stepped surface 54 on the inner peripheral surface of the lens holder 50 on the front end side. For example, four engaging claws 55 (FIG. 4) are provided. The distance F from the tip of the sensor 40 to the center of the lens 53 is set to be equal to the focal length of the lens 53. Then, the lens holder 50 is fitted in the inner case 6 and brought into close contact with the front surface of the front side wiring board 41B, and is fixed to the screw mounting portion 48 together with the wiring board 41B by a set screw 49. The lens 53 is a Fresnel lens, and the outer peripheral edge portion thereof is closely fixed to the stepped surface 54 of the lens holder 50 by the engaging claws 55 as described above, which uniquely determines the distance from the infrared sensor 40. The sensor 40 is accurately installed at the focal position of the lens 53.

Since the front cover 8 is formed in a shallow dish shape, it is provided with a disk portion 8A that covers the front surfaces of the outer case 5 and the inner case 6, and the outer peripheral surface of the disk portion 8A. An opening 57 larger than the inner diameter of the inner case 6 and smaller than the outer diameter of the collar portion 6B is formed in the center of the disc portion 8A. It is adapted to fit on the outer peripheral surface of the collar portion 5B. In addition, for example, four engaging claws 58 (FIGS. 2 and 6) are integrally projectingly provided around the opening 57 on the inner surface of the disk portion 8A so as to lock the flange portion 6B of the inner case 6. In addition, a cover 59 is provided to cover the opening 57 in an airtight manner. The cover 59 is formed in a dish shape with polyethylene resin or the like, the central portion is fitted into the opening 57 from the rear, and the outer peripheral portion is brought into close contact with the inner peripheral portion of the inner surface of the disk portion 8A, and the surface thereof is The flange portion 6B of the inner case 6 is brought into close contact with the ring-shaped cover packing 60. The cover packing 60 has an outer diameter larger than the outer diameter of the cover 59 and an inner diameter slightly smaller than the outer diameter of the cover 59, so that the inner surface of the disk portion 8A of the front cover 8 and the rear surface of the outer peripheral portion of the cover 59 are set. When the front cover 8 is attached to the inner case 6 by the engaging claws 58, the front cover 8 is compressed and the gap between the opening 57 and the cover 59 and the gap between the inner surface of the disc portion 8A and the cover 59 are compressed. Airtightly seal. Further, a pair of positioning projections 61 (FIG. 6) are integrally provided on the inner surface of the front cover 8 so that the projections 61 are formed on the outer peripheral surface of the collar portion 6B of the inner case 6 when the front cover 8 is attached. It is engaged with the cutout recess 62 formed. Since the lens 53 is not fixed to the front cover 8, it can be used as a common component for other detectors.

In FIGS. 1 and 2, a mounting bracket 65 for locking and fixing the outer case 5 to the ceiling plate 1 is provided on the outer periphery of the terminal cover 7. The mounting bracket 65 is composed of a highly rigid metal plate 67 having a screw hole 66 into which the mounting screw 27 is screwed, and a plate spring 68 fixed to the front surface of a metal plate 67. The leaf spring 68 is bent in a U shape to form a pair of left and right open / close legs 68a, 68b extending in the front-rear direction and a connecting portion 68c for connecting the rear ends of the open / close legs 68a, 68b. The connecting portion 68c is locked to the metal plate 67, and the opening / closing legs 68a and 68b slide from the rear side into the guide holes 34a and 34b provided at the rear end of the outer peripheral surface of the terminal cover 7, respectively. It is freely inserted. Further, the open / close legs 68a, 68b have a bent portion 70 that bends inwardly in a V shape at the center in the longitudinal direction, and when the mounting bracket 65 is moved back and forth by the mounting screw 27, the bent portion 70a is bent. Is abutted against or separated from the inclined portions 35a and 35b formed at the rear end of the outer peripheral surface of the terminal cover 7, whereby the legs are opened or closed. That is, in this embodiment, a leaf spring 68 having a habit of closing the legs is used, and when the leaf spring 68 is moved to the tip side of the mounting screw 27, the bending portion as shown by the chain double-dashed line in FIG. Since the terminal 70 is located behind the terminal cover 7, the open / close legs 68a and 68b maintain the closed leg state. The distance between the bent portions 70 in the closed leg state is smaller than the outer diameter of the terminal cover 7, and the front half portions of the opening / closing legs 68a and 68b are in close contact with the outer peripheral surfaces of the outer case 5 and the terminal cover 7, whereby the ceiling plate 1 is formed. The outer case 5 can be pulled out from the mounting hole 2 of. When the mounting bracket 27 is moved forward by rotating the mounting bracket 27 while the mounting bracket 65 is located on the tip side of the mounting bracket 27 as shown by the chain double-dashed line, the bent portion of the leaf spring 68 is bent. Since the top of 70 contacts the inclined portions 35a and 35b of the terminal cover 7, the open / close legs 68a and 68b are gradually opened. When the mounting bracket 65 moves forward by a certain distance, the front end of the leaf spring 68 contacts the ceiling side surface 1b of the ceiling plate 1 and presses the flange portion 5B of the outer case 5 against the ceiling side surface 1b of the ceiling plate 1. Therefore, the flange portion 5B of the outer case 5 and the leaf spring 68 sandwich the ceiling plate 1, and thereby the outer case 5 is fixed to the ceiling plate 1. When removing the outer case 5, the mounting screw 27 may be rotated to move the mounting bracket 65 backward, contrary to the above. Then, the bent portion 70 of the leaf spring 68 moves to the rear of the terminal cover 7, and the opening / closing legs 68a and 68b close due to their own habit of closing the legs. Therefore, the outer case 5 is easily removed from the mounting hole 2 of the ceiling plate 1. be able to.

The work of attaching the outer case 5 to the ceiling plate 1 is naturally performed before the attachment of the inner case 6. Further, the number of the leaf springs 68 is not limited to one, and a plurality of leaf springs can be used.

Here, in the present embodiment, the case where the spring having the habit of closing the legs is used as the leaf spring 68 has been described, but the leaf spring 68 is not limited to this and may be a leaf spring having the habit of opening the legs. . In that case, the inclined portions 35a, 35b are not always necessary, and the guide holes 34a, 34b regulate the opening angle of the opening / closing legs 68a, 68b when the outer case 5 is fixed, and the opening / closing with the backward movement of the mounting bracket 65. The legs 68a and 68b are closed.

Although the above embodiment has been described for the case where the present invention is applied to the occupancy detector 3, the present invention is not limited to this, and various changes and modifications are possible. It is possible to provide 10, 11 in the inner case 6 and the engaging portions 38, 39 in the outer case 5. Further, it is not limited to the in-room detector, and it is also possible to use a combined detector combined with other different detectors such as a temperature / humidity detector, a fire detector, an intrusion detector, and the like. Furthermore, although the detector 3 is embedded in the mounting hole 2 of the ceiling plate 1 in this embodiment, it may be embedded in the wall surface.

[0029]

[Effect of device]

 As described above, in the indoor-mounted detector according to the present invention, the wiring board in which the sensor is mounted is housed and arranged in the inner case, and the lens arranged in front of the sensor is held by the lens holder. Since it is configured to be closely fixed to the wiring board, the distance between the sensor and the lens is uniquely determined only by the dimensional accuracy of the lens holder, and the influence of the lens assembly error can be eliminated. Therefore, the distance between the sensor and the lens can be made equal to the focal length of the lens, and the detection sensitivity of the detector can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an indoor-mounted detector according to the present invention.

FIG. 2 is an exploded perspective view of the detector.

FIG. 3 is a rear view of the outer case.

4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a front view of an outer case.

FIG. 6 is a rear view of the inner case.

FIG. 7 is a cross-sectional view showing a mounting structure of external terminals.

FIG. 8 is a perspective view of a contact spring and an internal terminal.

FIG. 9 is a cross-sectional view of a main part of a wiring board.

[Explanation of symbols]

 1 Ceiling Plate 2 Mounting Hole 3 In-Room Detector 5 Outer Case 6 Inner Case 7 Terminal Cover 8 Front Cover 15 External Terminal 16 Terminal Metal Fitting 19 Contact Spring 19e Holding Part 20 External Code 25 Internal Terminal 40 Sensor 41B Wiring Board 50 Lens Holder 53 lens

Claims (1)

[Scope of utility model registration request] 1. An outer case having an external terminal to which an external cord is connected and embedded in a wall surface, a ceiling, etc., and a sensor, a wiring board, an internal terminal, etc. are built in and housed in the outer case. An indoor-mounted detector, comprising: an inner case, a lens arranged in front of the sensor, and a lens holder that holds the lens and is closely fixed to the wiring board.