JP4660707B2 - Security sensor device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a security sensor device that receives an infrared beam emitted from a light projecting element of a light projecting unit by a light receiving element of a light receiving unit and issues an alarm signal when an illegal intruder blocks the infrared beam. .
[0002]
[Prior art]
This type of security sensor device is installed at both ends of the linear security area, with the projectors of the infrared light projecting unit and the light receivers of the infrared light receiving unit arranged so that their optical axes coincide with each other. Since it is possible to set a warning area from a straight short distance to a long distance of several hundreds of meters, it becomes more difficult to accurately match the optical axes between the projector and the light receiver as the distance increases. Therefore, the conventional security sensor device is provided with a sighting device for aligning the optical axes of the projector and the light receiver, respectively, and the sighting device provided for the projector and the light receiver is not provided for installation or maintenance. Adjust the vertical and horizontal angles of the projector and receiver while looking through the window, and adjust the optical axis roughly by visual inspection. After that, while reading the signal level proportional to the amount of infrared rays received by the receiver with a built-in level meter such as a voltmeter connected to the detector circuit of the light receiving unit, the display level becomes equal to or higher than the predetermined light receiving level. Furthermore, the optical axis is finally adjusted by finely adjusting the angle of the light receiver.
[0003]
By the way, the output mirror that reflects the infrared light generated from the light projecting element of the light projecting unit in the security sensor device and emits it as an infrared beam directed in a certain direction, and the light collecting that collects the infrared beam of the light receiving unit on the light receiving element. For the purpose of reducing the cost by mass production, the mirror body is formed by molding a mirror body having a smooth surface such as a paraboloid or a spherical surface by injection molding of a synthetic resin using a molding die. In addition, the reflective surface is formed by vapor-depositing aluminum or applying chrome plating.
[0004]
On the other hand, the sighting device includes an eyepiece window, an objective window, and an aiming mirror disposed on the aiming axis between the eyepiece window and the objective window (see Japanese Utility Model Laid-Open No. 52-26539). As the aiming mirror, a commercially available resin mirror cut to a required size is used, and such a commercially available mirror has a reflective surface formed by vapor-depositing a metal foil on the back surface of a transparent plate material. It is a back reflector.
[0005]
[Problems to be solved by the invention]
However, in the conventional security sensor device, the aiming mirror is positioned at a relative position having a predetermined angle with respect to the output mirror or the collecting mirror and fixed by an adhesive means or the like. It is easy to assemble with an arrangement in which the optical axis of the aiming mirror and the optical axis of the exit mirror and the collector mirror are deviated from a predetermined relative angle. In other words, the aiming mirror is fitted and bonded to the mounting part of the aiming device, but considering the variation in the thickness of the aiming mirror, the aiming mirror with the maximum thickness can be fitted into the mounting part of the aiming mirror. This is basically a gap fit, and the aiming mirror at that time is prevented from rattling with an adhesive such as a screw lock. Thus, it is easy to be fixed with an arrangement shifted from a predetermined relative angle. When such an angle deviation occurs, the optical axis alignment by the sighting device may be inaccurate or the optical axis alignment may not be possible.
[0006]
In addition, in the conventional security sensor device, since the separate aiming mirror and the output mirror or the collecting mirror are positioned and assembled with each other, the workability is poor and the number of parts is increased due to the large number of parts. Incurs high costs.
[0007]
The present invention has been made in view of the above-described conventional problems, and provides a security sensor device that can assemble an aiming mirror at an accurate relative angle with respect to an output mirror or a collecting mirror and can reduce costs. It is intended to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a security sensor device according to the present invention includes a projector having a light projecting element that generates infrared light, an output mirror that reflects the infrared light and emits it as an infrared beam directed in a certain direction, A light receiver having a light receiving element and a condensing mirror for condensing an infrared beam from the light projector on the light receiving element; and an sighting device for adjusting the optical axis between the light projector and the light receiver. It is provided . The sighting device includes an eyepiece window, an objective window, and an aiming mirror disposed on an aiming axis between the eyepiece window and the objective window, and the aiming mirror is an output mirror of the projector or a condensing light of the light receiver. It is integrally formed with the mirror and protrudes from the exit mirror or the collector mirror. The sighting device includes a first case having the eyepiece window, the objective window, and a first case opening opened rearward, and a second case opening opened forward, and is connected to a rear portion of the first case. A second case covering the first case opening, and the aiming mirror is sandwiched between the first case and the second case. Here, the aiming axis refers to an optical axis that passes through each central portion of the eyepiece window, the aiming mirror, and the objective window.
[0009]
In this security sensor device, since the aiming mirror is integrally formed with the exit mirror of the projector or the condensing mirror of the light receiver, the exit mirror or the condensing mirror integrally provided with the aiming mirror is, for example, precisely molded. If molding is performed by injection molding using a mold, the relative angle between the aiming mirror and the exit mirror or collector mirror is uniquely determined by the molding mold and is always unaffected by variations in assembly. As well as being accurate, it is not necessary to position the aiming mirror, so that the assemblability is improved. In addition, since the aiming mirror and the output mirror or the collecting mirror are integrated, the number of assembling steps can be reduced as the number of parts is reduced, and a considerable cost reduction can be achieved. Moreover, even if the aiming mirror protrudes from the exit mirror or the collecting mirror and is easily deformed, when it is assembled in the aiming device, it is sandwiched between the first case and the second case, Deformation is prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a security sensor device according to an embodiment of the present invention. The security sensor device includes a light projecting unit 1 and a light receiving unit 8 that are attached to wall surfaces or poles at both ends of a linear security area. The light projecting unit 1 and the light receiving unit 8 are both unitized. It has become. The light projecting unit 1 and the light receiving unit 8 are installed in such a manner that the optical axes coincide with each other and face each other.
[0012]
The light projecting unit 1 has a light projector 2 and a light projector drive circuit 3, and a pair of the light projector 2 and the light projector drive circuit 3 are provided as will be described later, but only one is shown in FIG. Yes. The light projector 2 includes a light projecting element such as an infrared light emitting diode, and an output mirror that reflects the infrared light generated from the light projecting element and emits it as an infrared beam IR such as a near infrared light traveling in a certain direction. The projector drive circuit 3 emits an infrared beam IR composed of a pulse-modulated wave by driving the projector element of the projector 2 to emit light at a predetermined frequency.
[0013]
On the other hand, in the light receiving unit 8, a light receiver 9 including a condenser lens and a light receiving element such as a phototransistor receives the infrared beam IR from the light projecting unit 1 and has a signal level corresponding to the amount of received infrared light. Outputs electrical signals. After this electric signal is amplified by the amplifier circuit 10, disturbance light is removed by the detection circuit 11 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 set in advance. It is determined by the signal determination circuit 12 whether or not it is below the detection level. The signal determination circuit 12 outputs a detection signal when the infrared beam IR from the light projecting unit 1 is blocked by an illegal intruder and it is determined that the light reception signal level is equal to or lower than a preset intrusion detection level. The alarm circuit 13 is driven when a detection signal is input from the signal discrimination circuit 12, and outputs an alarm signal for notifying that an illegal intruder exists, for example, to a security center (not shown).
[0014]
A level meter 14 such as a voltmeter is connected to the detection circuit 11 of the light receiving unit 8, and a signal level proportional to the amount of infrared light received by the light receiver 9 is displayed on the level meter 14. In addition to the level meter 14, the detection circuit 11 may be connected to a level indicator that is lit when the level of the received light signal exceeds a predetermined level. The light receiver 9, the amplifier circuit 10, the detector circuit 11, the signal discriminating circuit 12, and the level meter 14 are also provided as a pair as will be described later, but only one is shown in FIG.
[0015]
2 is a schematic cross-sectional view of the sighting device 4 provided in the security sensor device, FIG. 3A is an exploded perspective view showing the sighting device 4, and FIG. 2B is a perspective view of the sighting device 4. . The illustrated sighting device 4 is provided in the light receiving unit 8, but the projecting unit 1 is also provided with a sighting device having the same configuration.
[0016]
As shown in FIG. 2, the main body case 7 of the sighting device 4 is configured by combining a first case 17 and a second case 18. The first case 17 has a first case opening 19 opened rearward, and has a pair of left and right eyepiece windows (observation windows) 20 and a pair of left and right objective windows (sighting holes) 21 on the front side surface. . These windows 20 and 21 may be simple openings, or may be made by fitting window materials made of transparent glass or resin into the openings.
[0017]
As clearly shown in FIG. 3A, a pair of positioning notches 22 are formed on the upper rear end surface of the first case 17, and a base portion of an aiming mirror to be described later is formed in the positioning notches 22. Applied. On the other hand, the second case 18 has a second case opening 23 that opens forward, and a locking piece 45 provided on both outer side surfaces of the first case 17 is provided at the rear of the first case 17. By engaging with a locking hole 46 provided on the side wall of the case 18, the case 18 is detachably connected to cover the first case opening 19 as shown in FIG. A screw body can be used as a connecting means for both cases 17 and 18.
[0018]
The condensing mirror 24 in the light receiver 9 has a parabolic reflecting surface formed on the inner surface. As shown in FIG. 3A, the condensing mirror 24 has a strip shape extending in the vertical direction. A pair of left and right aiming mirrors 27 that are flat plates are integrally projected. The integrated condenser mirror 24 and the pair of aiming mirrors 27 are surfaces on which infrared rays or visible rays enter after each mirror body is formed by injection molding with a synthetic resin using a molding die. On the side, surface treatment such as aluminum deposition or chrome plating is performed to form a surface reflecting mirror.
A retaining piece 47 is formed at the base (upper part) of the aiming mirror 27.
[0019]
The light receiver 9 is configured by arranging a light receiving element 31 mounted on a printed board (not shown) at the focal position of the condenser mirror 24 as shown by a two-dot chain line in FIG. The infrared beam IR emitted from the light beam is reflected by the condenser mirror 24 and condensed on the light receiving element 31. The light projector 2 arranges a light projecting element at the focal position of the exit mirror having the same shape as the condensing mirror 24, reflects the infrared light generated from the light projecting element by the output mirror, and emits it as an infrared beam IR directed in a certain direction. It is like that.
[0020]
In the main body case 7 of the sighting device 4, the root portions of the pair of aiming mirrors 27 are applied to the positioning notches 22 of the first case 17, and below the notches 22, that is, inward of the main body case 7, The second case 18 is assembled to the rear portion of the first case 17 in a state where the retaining piece 47 is positioned and the condenser mirror 24 is in contact with the upper surface of the first case 17. At this time, the aiming mirror 27 is prevented from being detached from the main body case 7 by the retaining piece 47 and between the positioning notch 22 and the front edge pressing portion 18 a facing the notch 22 in the second case 18. It is pinched by. Further, the front end portion (lower end portion) of the aiming mirror 27 is sandwiched between holding pieces 48 (only the second case 18 is shown) formed on the inner bottom surfaces of the cases 17 and 18. Thus, the aiming mirror 27 is accurately positioned and arranged on the aiming axis 32. The main body case 7 has bearing tube portions 28 provided on both sides of the light receiver 9 so as to be rotatably fitted on the horizontal support shaft 30 of the support plate 29, so that both the support shaft 30 and the receiver 9 are integrated. Is set to be movable.
[0021]
FIG. 4 is a perspective view showing the light receiving unit 8 in which the sighting device 4 is incorporated. Since the light projecting unit 1 has the same configuration, FIG. 4 corresponds to the corresponding parts in the light projecting unit 1. Reference numerals are also given. The light receiving unit 8 includes an attachment base 33 that is attached to an attachment surface such as a wall, and a cover 35 that is detachably attached to the attachment base 33 through a plurality of attachment holes 34 and covers the entire sensor circuit. The outer case is configured. In the light receiver 9, the light receiving element 31 is disposed at the focal position of the collector mirror 24, and the opening of the collector mirror 24 is covered with a mirror cover 36.
[0022]
A rotating plate 37 is provided on the upper and lower portions of the terminal block case 39 provided at the center of the mounting base 33 so as to be rotatable around a vertical axis (not shown) (in the h direction in the figure). In FIG. 2, a pair of support plates 29 shown in FIG. 2 are fixed in an arrangement orthogonal to the rotating plate 37 of FIG. An operation plate 38 with a non-slip (shown only on the right side) 38 is fixed to the outer side surfaces of both support plates 29. By rotating the operation plate 38 by hand, the horizontal direction of the light receiver 9 can be obtained. The angle (angle in the h direction in FIG. 4) is roughly adjusted. Further, fine adjustment is performed by rotating the adjustment screw 40 in the forward / reverse direction.
[0023]
As shown in FIG. 2, the sighting device 4 integrated with the light receiver 9 is configured such that the left and right integral bearing cylinder portion 28 of the light receiver 9 is rotatably fitted to the support shaft 30 of the support plate 29 to be supported. The shaft 4 is supported so as to be rotatable about the axis 30 (v direction in FIG. 4), and the sighting device 4 is rotated around the support shaft 30 by rotating the adjusting screw 41 in FIG. Is called. Thus, the vertical angle of the light receiver 9 (the angle in the v direction in FIG. 4) is variably adjusted. The optical axis alignment of the light receiver 9 with respect to the projector 2 is performed by variably adjusting the horizontal angle and the vertical angle. Note that the light projecting unit 1 in FIG. 1 only includes a light projecting element instead of the light receiving element at the position where the light receiving element 31 is disposed, and the other configuration is the same as that of the light receiving unit 8 described above. Further, in this sensor device, an alarm signal is output from the alarm circuit 13 when both detection signals are output from the two light receivers 9 in FIG.
[0024]
In this security sensor device, when the optical axis is adjusted during installation or maintenance, first, the cover 35 that is detachable from the base 33 of FIG. The horizontal or vertical angle of the projector 2 is adjusted by operating the operation plate 38 or the adjusting screws 40 and 41 while looking into the projector 20, so that the image of the light receiver 9 reflected on the aiming mirror 27 and the objective window 21 overlap. By doing so, the optical axis is adjusted.
[0025]
Next, the same operation is performed on the light receiving unit 8 to perform coarse adjustment of the optical axis. Subsequently, while observing the display of the level meter 14 in FIG. 1, the operation plate 38 or the adjusting screws 40 and 41 in FIG. 4 are rotated to finely adjust the optical axis so that the display level becomes the maximum value. A plurality of such optical axis adjustments of the light projecting unit 1 and the light receiving unit 8 are performed as necessary until the display of the meter 14 reaches a predetermined level or higher, that is, until the optical axis of the light receiving unit 9 accurately matches the projector 2. Repeat once.
[0026]
In this security sensor device, since the aiming mirror 27 and the output mirror 24 of the projector 2 or the condensing mirror 24 of the light receiver 9 are integrally formed, the number of assembly steps can be reduced and the cost can be reduced as the number of parts is reduced. Can be achieved. In addition, the relative angle between the aiming mirror 27 and the output mirror or the collecting mirror 24 is uniquely determined by a precise molding die at the time of molding, so that it is always not affected by variations in positioning at the time of assembly. It becomes accurate, and optical axis alignment can be performed easily and accurately. Further, in this security sensor device, since the positioning of the aiming mirror and the output mirror or the collecting mirror is unnecessary, the assemblability is improved. Further, since the aiming mirror 27 of the aiming device 4 protrudes from the output mirror or the collecting mirror 24 as a strip-shaped plate material, it tends to bend or twist, but the first mirror 27 when the lens is assembled in the body case 7 Since it is sandwiched between the case 17 and the second case 18, the deformation is prevented and the accurate aiming shaft 32 (FIG. 2) can be maintained.
[0027]
In addition, since a commercially available rear-surface reflecting mirror having a reflective layer formed on the back surface of a transparent plate material is used as a sighting mirror, the light path enters and exits due to refraction when passing through the transparent plate material. Since the deviation occurs, it must be designed in consideration of the light refraction and reflection, and the aiming mirror relative to the output mirror or the collecting mirror is also caused by the variation in the thickness of the transparent plate of the aiming mirror. Angle deviation is more likely to occur. On the other hand, the aiming mirror 27 of the present invention is different from the aiming mirror of the back reflecting mirror that the conventional aiming device has, and the surface reflection is obtained by subjecting the mirror body, which is an injection molded product, to surface treatment by vapor deposition of aluminum or chromium plating. Since it is a mirror, it is not necessary to consider the deviation of the entrance / exit point of the optical path due to refraction and the variation in the thickness of the aiming mirror 27 at the time of design, so that the design can be simplified. Cost reduction can be achieved.
[0028]
【The invention's effect】
As described above, according to the security sensor device according to the present invention, since the aiming mirror is integrally formed with the exit mirror of the projector or the collector mirror of the receiver, the aiming mirror and the exit mirror or the collector mirror are: While always having an accurate relative angle without variation, assemblability is improved. In addition, since the aiming mirror and the output mirror or the collecting mirror are integrated, the number of assembling steps can be reduced as the number of parts is reduced, and the cost can be reduced. Furthermore, since a surface reflecting mirror can be used, it is not necessary to take into account deviations in the light path entrance and exit points due to refraction and variations in the thickness of the aiming mirror 27 during design, and the design can be simplified.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a security sensor device according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a sighting device provided in the security sensor device of the above.
FIG. 3A is an exploded perspective view showing the sighting device, and FIG. 3B is a perspective view of the sighting device.
FIG. 4 is a perspective view showing a light receiving unit configured by incorporating the above-mentioned sighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Light projector, 4 ... Aiming device, 9 ... Light receiver, 17 ... 1st case, 18 ... 2nd case, 19 ... 1st case opening part, 20 ... Eyepiece window, 21 ... Objective window, 23 ... 2nd case opening , 24... Exiting mirror, condensing mirror, 27... Sighting mirror, 31... Light receiving element, 32.

Claims (1)

A projector having a light projecting element that generates infrared light and an output mirror that reflects the infrared light and emits it as an infrared beam directed in a certain direction, and collects the infrared light receiving element and the infrared beam from the light projector on the light receiving element. A crime prevention device comprising a light receiver having a condensing mirror and a sighting device provided on the projector or the light receiver for adjusting the optical axis between the two, and detecting a human body or the like by blocking an infrared beam by the human body or the like A sensor device,
The sighting device comprises an eyepiece window, an objective window, and an aiming mirror disposed on the aiming axis between the eyepiece window and the objective window,
The aiming mirror is integrally formed with the output mirror of the projector or the condenser mirror of the light receiver, and protrudes from the output mirror or the condenser mirror,
The sighting device includes a first case having the eyepiece window, the objective window, and a first case opening opened rearward, and a second case opening opened forward, and is connected to a rear portion of the first case. A second case covering the first case opening,
A sensor device for crime prevention in which the aiming mirror is sandwiched between the first case and the second case .

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