JP2006309743A - Sensor device for crime prevention having cover opening/closing detection switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor device for crime prevention that accurately detects the opening/closing of a cover by means of a cover opening/closing detection switch without increasing the number of parts. <P>SOLUTION: The sensor device for crime prevention comprises a sensor body 41 including sensor elements 15 or 23 for transmitting or receiving detection wave IR for object detection, and the cover 43 covering the sensor body 41. The sensor body 41 is mounted with the cover opening/closing detection switch 31, and the cover 43 is provided with a switch operating element 34 for moving an actuator 31a of the cover opening/closing detection switch 31 into an on/off state as the cover 43 is closed/opened. The movement direction Q of the actuator 31a of the cover opening/closing detection switch 31 is set perpendicular to the opening/closing direction P of the cover 43. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a security sensor device having a switch that is attached to a sensor body and detects opening and closing of a cover that covers a sensor element and the like.

  As this type of security sensor device, an infrared beam projector and a light receiver are installed at both ends of a linear security area, and an infrared beam is projected and received between the projector and the receiver. One that detects a human body by detecting that the beam is obstructed by the human body is known. In this security sensor device, the light projecting part and the light receiving part have substantially the same external shape as shown in FIG. 5 which is unitized (see, for example, Patent Document 1).

  In FIG. 5, on the front side of the sensor main body 60 (left side in the figure), a first circuit board 62 on which a sensor element 61 for transmitting or receiving an infrared beam is mounted, and the sensor element 61 are disposed. An element unit 64 having an optical system 63 is provided, and this element unit 64 is covered and protected by a cover 65 that is detachably attached to the sensor body 60. The sensor main body 60 is provided with a cover open / close detection switch 66 configured by a limit switch for detecting the opening / closing of the cover 65 mounted on the second circuit board 67. The cover open / close detection switch 66 is a tamper switch for detecting the removal of the cover 65 by an illegal intruder and generating an alarm signal to notify a security company or the like, or an operation mode in the sensor circuit by detecting the opening / closing of the cover 65. Is a mode changeover switch for generating a changeover signal for switching between the optical axis adjustment mode and the operation mode with the cover 65 removed.

  The cover open / close detection switch 66 is operated at the tip of an operation rib 68 integrally formed as a switch operating piece on the synthetic resin cover 65 when the cover 65 is attached to the sensor body 60. When the child (actuator) 69 is pushed down and turned on while rotating from the position indicated by the two-dot chain line to the position indicated by the solid line, the attachment of the cover 65 is detected. Conversely, the tip of the operation rib 68 opens and closes the cover. By opening the switch 66 away from the actuator 69, the opening of the cover 65 is detected.

Japanese Patent Laid-Open No. 10-039043

  However, the light projecting unit or the light receiving unit of the security sensor device is arranged such that the cover open / close detection switch 66 has the rotation direction R of the actuator 69 in the same direction as the open / close direction T of the cover 65 with respect to the sensor body 60. Therefore, when the cover 65 is completely attached to the sensor body 60, the operation rib 68 rotates the actuator 69 by a predetermined stroke, and the cover open / close detection switch 66 is reliably turned on. As described above, it is necessary to accurately set the relative position between the operation rib 68 and the actuator 69 of the cover opening / closing detection switch 66. Therefore, the cover opening / closing detection switch 66 is complicated to be attached, and the following problems occur.

  That is, in FIG. 5, when the installation surface S such as the wall surface on which the light projecting unit or the light receiving unit of the security sensor device is mounted is not flat, a sensor made of synthetic resin attached to the installation surface S The main body 60 may be deformed into a warped shape corresponding to the unevenness of the installation surface S. When both ends of the cover 65 in the longitudinal direction (vertical direction in this example) are fixed to the deformed sensor body 60, the relative positions of the operation rib 68 and the actuator 69 in the opening / closing direction T are shifted from a predetermined position. The open / close detection switch 66 may malfunction.

  Further, a wiring (not shown) is connected to a plurality of terminal screws (not shown) attached to the terminal block 70 provided at the upper end portion of the sensor body 60, and the cover 65 is attached. Sometimes, it is necessary to reduce the bulk so that the wiring can be accommodated in the cover 65 without difficulty. Here, when the cover 65 is forcibly attached to the sensor main body 60 without making the wiring bulky, the cover 65 may be attached to the sensor main body 60 in a state where the wiring is raised and the cover 65 is lifted. As a result, similarly to the case where the installation surface S has irregularities, the relative positions of the operation rib 68 and the actuator 69 in the opening / closing direction T are shifted, and the cover opening / closing detection switch 66 malfunctions.

  On the other hand, conventionally, even when a spring is attached to the operation rib 68 of the cover 65 and the cover 65 is mounted in a state of being lifted with respect to the sensor body 60, the operation rib 68 and the actuator 69 in the opening / closing direction T are also provided. A proposal has been proposed in which a change in relative position is absorbed by expansion and contraction of a spring so that the cover open / close detection switch 66 is reliably turned on. However, this security sensor device increases the cost and reduces reliability as the configuration becomes complicated due to an increase in the number of parts.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a security sensor device capable of accurately detecting the opening / closing of a cover by a cover opening / closing detection switch without increasing the number of parts. Yes.

  In order to achieve the above object, a security sensor device according to the present invention includes a sensor body including a sensor element that transmits or receives a detection wave for detecting an object, and a cover that covers the sensor body, the sensor A cover opening / closing detection switch is mounted on the main body, and a switch operating piece that is turned on / off by moving an operator of the cover opening / closing detection switch in conjunction with the opening / closing operation of the cover is provided on the cover. The moving direction of the detection switch actuator is set to be orthogonal to the opening / closing direction of the cover.

  According to this configuration, the cover opening / closing detection switch is provided in an arrangement in which the moving direction of the actuator is orthogonal to the opening / closing direction of the cover, that is, the moving direction of the switch operating piece. On the other hand, even if the cover is provided in a relative arrangement that is turned on by the switch operation piece immediately before it is completely attached to the sensor body, the switch operation piece is not changed as the cover is attached. The actuator is moved while keeping the on state, and is completely attached. Therefore, even if there is a margin in the relative position of the cover open / close detection switch with respect to the cover and there is a slight variation in the relative positional relationship between the cover and the cover open / close detection switch when the cover is attached to the sensor body, this variation Absorbing and the cover open / close detection switch can accurately detect the opening / closing of the cover. In addition, the cover open / close detection switch is simply provided by changing the moving direction of the actuator to an arrangement perpendicular to the cover open / close direction, and does not require other parts such as a spring. Will not increase.

  In the present invention, the cover open / close detection switch is, for example, a limit switch that is turned on and off by the rotating actuator. According to this configuration, when the cover open / close detection switch is provided so that the rotation fulcrum of the rotating operator is located near the cover, the cover switch operation piece operates when the cover is mounted. Since the cover open / close detection switch is turned on by moving while pushing the child, it can be moved slightly while sliding on the actuator to keep the cover on. Is turned on and off smoothly and accurately.

  In the present invention, the sensor body has a circuit board protruding toward the cover, and the cover open / close detection switch is mounted on the circuit board. According to this configuration, the cover open / close detection switch is mounted on a circuit board provided in parallel to the cover open / close direction so that the movement direction of its own actuator is orthogonal to the cover open / close direction. Can be easily arranged.

  In the present invention, an operation rib for forming the switch operation piece is integrally formed on the inner surface of the cover. According to this configuration, the relative position between the operation rib formed integrally with the cover and the cover open / close detection switch can be set accurately, and an increase in the number of components is suppressed.

  According to the security sensor device of the present invention, the cover open / close detection switch is disposed so that the moving direction of the operating element thereof is orthogonal to the cover open / close direction. Since there is a margin, even if there is a slight variation in the relative positional relationship between the cover and the cover open / close detection switch, the cover open / close detection switch can accurately detect the opening / closing of the cover. Can do.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a security sensor device according to a first embodiment of the present invention. This security sensor device is an active type composed of a light projecting unit 1 and a light receiving unit 2 which are installed in opposite positions with their optical axes coinciding with wall surfaces or poles on both ends of a linear security area. It is an infrared detector, and an infrared beam IR is projected and received as a detection wave for human body detection. The light projecting unit 1 and the light receiving unit 2 are both unitized as will be described later.

  The light projecting unit 1 includes a light projecting side element unit 11, a light projecting drive circuit 12, a light projecting suppression circuit 13, and a light projecting side cover open / close detection switch 14. The element unit 11, the light projection drive circuit 12, and the light projection suppression circuit 13 are provided in plural, for example, a pair, but only one is shown in FIG. The element unit 11 includes a light emitting element 15 such as an infrared light emitting diode and a transmitting side optical system 16 such as a light projecting lens or a reflecting mirror for forming an infrared beam IR such as near infrared light, and is configured as a light projector. ing. The light projecting drive circuit 12 drives the light emitting element 15 to emit light at a predetermined frequency and emits an infrared beam IR composed of a pulse modulated wave. The light projecting side cover open / close detection switch 14 is a limit switch that detects opening / closing of a cover, which will be described later, with respect to the sensor body. When the cover opening / closing detection switch 14 detects the opening of the cover, the light projection suppression circuit 13 supplies the light emitting element 15 with driving power that reduces the infrared beam IR emitted from the light emitting element 15 by the amount of attenuation transmission by the cover. Thus, the light projecting drive circuit 12 is controlled.

  On the other hand, in the light receiving unit 2, the receiving side element unit 21 includes a receiving side optical system 22 such as a light receiving lens or a condensing mirror and a light receiving element 23 such as a phototransistor, and is configured as a light receiver. The receiving side element unit 21 receives the infrared beam IR from the light projecting unit 1 and outputs an electrical signal corresponding to the amount of received infrared light. After this electric signal is amplified by the amplifier circuit 24, disturbance light is removed by the detection circuit 25 and converted into a signal corresponding to the level of the received light signal by only the pulse modulated wave, and this signal level is below the set detection level. Whether or not there is is determined by the signal determination circuit 26. When the infrared beam IR from the light projecting unit 1 is blocked by an illegal intruder and the received light signal level falls below a preset detection level, a detection signal is output from the signal determination circuit 26 and the alarm circuit 27 is driven. An alarm signal for notifying that an illegal intruder exists is output from the alarm circuit 27 to a security center (not shown), for example.

  A level meter 29 such as a voltmeter connected to the detection circuit 25 displays a signal level proportional to the amount of infrared light received by the element unit 21. Further, the gain of the amplifier circuit 24 is controlled by the AGC circuit 30 in accordance with the signal level of the light reception signal from the element unit 21 so that the output is always below a certain signal level. A plurality of element units 21, amplifier circuits 24, detector circuits 25, signal discriminating circuits 26, and level meters 29 are also provided, for example, one pair, but only one is shown in FIG. 1. The light receiving unit 2 further includes a light receiving side cover open / close detection switch 31 and a light receiving level suppression circuit 32. The light-receiving-side cover open / close detection switch 31 is a limit switch that detects opening / closing of a cover, which will be described later, with respect to the sensor body. The light reception level suppression circuit 32 lowers the gain of the amplifier circuit 24 via the AGC circuit 30 when the cover open / close detection switch 31 detects the opening of the cover, thereby causing the amplifier circuit 24 to receive the signal from the element unit 21. Control is performed so that the signal level of the received light signal is reduced by the amount of attenuation transmission by the cover and amplified.

  The light projecting unit 1 and the light receiving unit 2 have substantially the same configuration that is unitized as described above. Therefore, the light receiving unit 2 shown in FIGS. 2A and 2B will be described as a representative. The light receiving unit 2 is made of a resin sensor body 41 attached to an installation surface S such as a wall surface or a pole shown in FIG. 2A, and a resin made body detachably attached to a base 42 of the sensor body 41. And a cover 43.

  In the element unit 21 on the light receiving side, a pair of upper and lower receiving optical systems 22 including light receiving lenses are held by a unit case 45, and a first circuit board 46 is mounted inside the unit case 45, and each receiving unit The light receiving element 23 is mounted on the first circuit board 46 and is located behind the side optical system 22. On the second circuit board 47 mounted on the base 42, the sensor circuits 21, 24-27, 29-32 having the configuration shown in FIG. 1 are mounted.

  At the time of installation of the security sensor device or adjustment of the optical axis during maintenance, the cover 43 is removed, whereby both the amount of emitted light and the amount of received light of the infrared beam IR are increased by the amount of transmission attenuation by the cover 43, and the infrared beam IR The signal level becomes too high, and due to the saturation of the AGC circuit 30 shown in FIG. 1 and the reflection of the infrared beam IR on the installation surface S, the received light signal exceeds the predetermined level even if the optical axes do not match. It may be difficult to align the optical axis. Therefore, when the cover open / close detection switches 14 and 31 detect the opening of the cover 43, the light projection suppression circuit 13 and the light reception level suppression circuit 32 of FIG. The signal level is controlled by subtracting the transmission attenuation of the infrared beam IR. Therefore, in this security sensor device, it is necessary to accurately detect the opening / closing of the cover 43 by the cover opening / closing detection switches 14, 31.

  A terminal block 6 is fixed to the upper part of the front side of the base 42, and a third circuit board 48 is projected in the horizontal direction projecting toward the cover 43, that is, on the installation surface S. The sensor body 41 is in contact with the mounting surface 42a of the base 42 of the sensor main body 41 in a direction perpendicular to the mounting surface 42a. On the third circuit board 48, the cover opening / closing detection switch 31 comprising a limit switch is attached in such a manner that the direction Q of the rotation stroke of the actuator 31a is orthogonal to the opening / closing direction P of the cover 43. . In this way, by attaching the cover opening / closing detection switch 31 to the third circuit board 48 provided in parallel to the opening / closing direction P of the cover 43, the cover opening / closing detection switch 31 can be rotated by its own actuator 31a. The direction Q is provided so as to be orthogonal to the opening / closing direction P of the cover 43.

  3A and 3B show a plan view and a front view of the sensor main body 41 with the cover 43 removed. In the figure, a support member 7 is fixed to the lower end of the front side of the base 42, and a holding body 8 having a substantially U-shaped cross section is provided on the support member 7 so as to be rotatable about a vertical axis 9. It is supported in a portable manner. Further, the element unit 21 is attached to the holding body 8 so as to be rotatable around the left and right horizontal axes 10 (FIG. 2). The vertical axis 9 is, for example, a screw body, and the horizontal axis 10 is a pin.

  Therefore, the horizontal deflection angle of the element unit 21 is variably adjusted by rotating about the vertical axis 9 via the holding body 8, and the vertical deflection angle is variably adjusted by rotating about the horizontal axis 10. Thereby, the optical axis alignment with respect to the element unit 11 of the light projecting unit 1 in FIG. 1 can be performed. This optical axis adjustment is performed using a sighting device described later.

  As shown in FIG. 2, a dial 35 for performing an operation for adjusting the horizontal deflection angle of the element unit 21 via the holding body 8 is fixed to the vertical axis 9. As shown in FIG. 3B, an adjustment screw 19 is rotatably supported on the front side near the lower end of the holding body 8, and the adjustment screw 19 is a protrusion formed at the lower part of the unit case 45. (Not shown). Therefore, if the dial 35 is rotated, the horizontal deflection angle of the element unit 21 can be adjusted via the holding body 8 that is rotatable about the vertical axis 9, and if the adjusting screw 19 is rotated, the horizontal axis 10 is adjusted. The vertical deflection angle of the element unit 21 can be adjusted via a unit case 45 that is rotatable around.

  A known sighting device 36 for adjusting the optical axis is provided at the center in the vertical direction of the unit case 45 of the element unit 21 shown in FIG. The aiming device 36 includes a pair of left and right observation windows 38 provided in the aiming device case 37, a pair of aiming holes 39 provided on the left and right of the front side of the front, and a pair of left and right reflections provided in the aiming device case 37. And a mirror (not shown). The sighting device 36 adjusts the horizontal deflection angle or the vertical deflection angle of the element unit 21 by manually operating the dial 35 or the adjustment screw 19 while looking through the observation window 38 with the cover 43 opened, and is applied to the reflection mirror. A rough adjustment of the optical axis is performed by operating so that the image of the element unit 11 of the light projecting unit 1 shown in FIG. 1 and the aiming hole 39 shown in FIG. Following this rough adjustment, fine adjustment of the optical axis is performed by adjusting the dial 35 and the adjustment screw 19 in FIG. 3B so that the display level becomes the maximum value while viewing the display of the level meter 29 in FIG. The light axis adjustment of the light projecting unit 1 and the light receiving unit 2 is necessary until the display of the level meter 29 in FIG. 1 reaches a predetermined level or higher, that is, until the optical axis of the light receiving unit 2 accurately matches the light projecting unit 1. Repeat several times depending on The light projecting unit 1 has the same configuration as the light receiving unit 2 described above.

  In the light receiving unit 2, the cover 43 is displaced from the normal relative position with respect to the sensor main body 41 due to the sensor main body 41 being deformed and attached in a warped shape or the internal wiring being raised. Even if it is a case where it was mounted | worn in the position which was mounted | worn, it has aimed at detecting mounting | wearing of the cover 43 reliably. That is, as shown in FIG. 2A, the cover open / close detection switch 31 is attached in an arrangement in which the rotation direction Q of the rotation stroke of the actuator 31 a is orthogonal to the opening / closing direction P of the cover 43. Further, as shown in FIG. 3C, the terminal block 6 that holds the third circuit board 48 has a guide recess 17 that opens forward, upward, and rightward in the upper part of the vicinity of the right end thereof. Is formed. The left side surface 17a and the bottom surface 17b of the guide recess 17 serve as guide surfaces for guiding operation ribs 34 to be described later. The left side surface 17a is parallel to the front-rear direction F and the up-down direction V, and the bottom surface 17b is parallel to the front-rear direction F and the left-right direction W. An insertion hole 20 is formed in the bottom surface 17 b, and the operator 31 a of the cover open / close detection switch 31 is inserted into the insertion hole 20 and protrudes upward from the upper surface of the guide surface 18. Further, a relief hole 33 is formed on the rear side of the guide recess 17.

  On the other hand, as shown in FIG. 4, on the inner surface of the cover 43, the switch of the actuator 31a of the cover open / close detection switch 31 is provided at a position corresponding to the guide recess 17 when the sensor main body 41 of FIG. An operation rib 34 that functions as an operation piece is integrally formed. Further, a boss 53 having a locking hook piece 51 and a screw insertion hole 52 for attaching the cover 43 to the sensor body 41 is formed at the upper end and the lower end of the cover 43 in FIG. As described above, since the operation rib 34 is integrally formed on the inner surface of the cover 43, the relative position between the operation rib 34 and the cover open / close detection switch 31 can be accurately set. However, the actuator 31a of the cover opening / closing detection switch 31 is reliably turned on / off in conjunction with the opening / closing operation of the cover 43.

  When the cover 43 is attached to the sensor main body 41, the hook 43 of the cover 43 is hooked on the hook (not shown) of the base 42 of the sensor main body shown in FIG. Is fitted into the base 42. At this time, the operating rib 34 of the cover 43 protrudes upward through the insertion hole 20 of FIG. 3C when sliding on the bottom surface 17b which is the guide surface and moving backward. While sliding with respect to 31a, the actuator 31a is pushed into the insertion hole 20 as shown in FIG. 2 (b), and the tip enters into the escape hole 33 of FIG. 3 (c) and stops. Here, the cover open / close detection switch 31 is provided so that the rotation fulcrum 31b (FIG. 2A) of the actuator 31a is positioned near the cover 43, and is used for operating the cover 43 when the cover 43 is attached. The rib 34 moves while rotating in a state where the operating element 31a is pushed in from its own movement path, and the cover open / close detection switch 31 is turned on immediately before the cover 43 is completely attached to the sensor body 41. After that, the operation rib 34 slides on the actuator 31a and moves slightly while maintaining the ON state, and the mounting of the cover 43 is completed.

  Thus, since the cover opening / closing detection switch 31 is turned on by the operation rib 34 before the cover 43 is mounted, the relative position between the cover opening / closing detection switch 31 and the cover 43 when fully installed is set. There will be a margin for this. In the conventional sensor device shown in FIG. 5, such a margin is obtained because the opening / closing direction T of the cover 65 and the movement direction R of the operating element 69 are the same, so that the relative position of the operating element 69 and the operating rib 68 can be accurately determined. Can not occur because it is necessary to set to. Therefore, in this embodiment, the sensor main body 41 in FIG. 2A is mounted on a non-flat installation surface S and deformed into a warped shape, or wiring (not shown) connected to the terminal block 6 is provided. When the cover 43 is mounted on the sensor main body 41, a gap is generated between the cover 43 and the actuator 31a of the cover open / close detection switch 31, and so on. Even if there is a slight variation in the relative positional relationship between 43 and 31, the cover opening / closing detection switch 31 can accurately detect the opening / closing of the cover 43 by absorbing this variation.

  In addition, this security sensor device is provided with the cover opening / closing detection switch 31 in such a manner that the moving direction (in this case, the rotation direction) Q of the actuator 31a is orthogonal to the opening / closing direction P of the cover 43. Therefore, it is not necessary to provide other parts such as a spring, and the number of parts does not increase.

  The present invention can be applied to the light projecting unit 1 in addition to the light receiving unit 2 exemplified in the above-described embodiment of the security sensor device. In addition, a passive infrared detector that detects far infrared rays, ultrasonic waves It can also be applied to security sensor devices using microwaves.

It is a block diagram which shows the sensor apparatus for crime prevention which concerns on one Embodiment of this invention. (A)-(c) is a partially broken exploded right side view and a partially broken right side view showing a light receiving part in the security sensor device same as above. (A)-(c) is the top view which shows the sensor main body of the light-receiving part same as the above, a front view, and a perspective view of the principal part, respectively. It is a perspective view which shows the cover of a light-receiving part same as the above. It is the partially broken right view which shows the conventional sensor apparatus for crime prevention.

Explanation of symbols

14 Cover open / close detection switch (limit switch)
15 Light emitting element (sensor element)
23 Light receiving element (sensor element)
31 Cover open / close detection switch (limit switch)
31a Actuator 34 Rib for operation (switch operation piece)
41 Sensor body 43 Cover 48 Third circuit board (circuit board)
IR infrared beam (detection wave)
P Cover opening / closing direction Q Turning direction (moving direction of actuator)

Claims (4)

A sensor body including a sensor element that transmits or receives a detection wave for detecting an object; and a cover that covers the sensor body;
A cover opening / closing detection switch is attached to the sensor body, and a switch operation piece that is turned on / off by moving an operator of the cover opening / closing detection switch in conjunction with the opening / closing operation of the cover is provided on the cover, A sensor device for crime prevention, wherein a movement direction of an operating element of the cover opening / closing detection switch is set to be orthogonal to an opening / closing direction of the cover.   2. The security sensor device according to claim 1, wherein the cover open / close detection switch is a limit switch that is turned on and off by the rotating actuator.   3. The security sensor device according to claim 1, wherein the sensor body has a circuit board protruding toward the cover, and the cover open / close detection switch is mounted on the circuit board.   4. The security sensor device according to claim 1, wherein an operation rib for forming the switch operation piece is integrally formed on an inner surface of the cover.

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