JP2005202727A - Intrusion detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intrusion detection device capable of preventing the occurrence of malfunction due to a plant, a large bird such as a crow, fallen leaves, a small animal such as a little bird, or the like. <P>SOLUTION: In the detection device consisting of an infrared detection unit 1 arranged on the upper frame 3 of a fence 4 and consisting of an infrared transmitting part 11 and an infrared receiving part 12 and an alarm 5, a reflector 2 is arranged on the upper frame 3 between the infrared transmitting part 11 and the infrared receiving part 12 opposed to the transmitting part 11 and direct light (a) from the infrared transmitting part 11 and diffused reflected light b2 which is obtained by reflecting diffused light b1 irradiated together with the direct light (a) by the reflector 2 are detected by the infrared receiving part 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an intrusion detection device. More specifically, the present invention relates to an intrusion detection device that uses an LED as an infrared transmission source and is attached to a fence, a gate, a fence, and the like, and can detect the intrusion of a suspicious person and issue an alarm.

In recent years, since crimes tend to occur frequently, crime prevention awareness is improved even in ordinary households, and various alarm devices are provided on fences, gates, fences, and the like.
JP-A-3-144896 (page 1-3, FIGS. 1-3) JP-A 64-64478 (page 1-4, FIGS. 1-3)

  Among the above alarm devices, in the method of detecting a suspicious person using infrared rays from an LED, the alarm device is composed of a transmitting unit that transmits infrared rays and a receiving unit that receives infrared rays. An infrared ray is detected and an alarm is issued to notify the householder. However, even when a small animal such as a fallen leaf or a small bird blocks infrared rays, the receiving unit may detect it and issue an alarm by mistake.

  So, for example, two infrared transmitters are installed one above the other so that even if the lower infrared beam is blocked due to the above causes, the upper beam is not blocked, and conversely, the upper infrared beam is blocked. However, improvements have been made so that the lower infrared beam is not blocked. However, for this purpose, a plurality of LEDs must be used, and there is a problem that the detection unit becomes large and the cost increases. The present invention solves such problems and provides an intrusion detection device that can prevent malfunctions caused by small animals such as plants, crows, fallen leaves, and small birds while using infrared rays from a single LED. Is the issue.

  In order to solve the above problems, the present invention takes the following technical means. That is, according to the present invention, in the detection device that is installed on the fence of the fence and includes the infrared transmission unit and the infrared reception unit, and the alarm device, the infrared transmission unit and the infrared that is opposed to the infrared transmission unit A reflector is provided on the upper surface of the upper cross between the receiver and the infrared receiver that receives the direct light from the infrared transmitter and the diffusely reflected light reflected by the reflector with the direct light. An intrusion detection device is provided that is detected by a unit.

  You may use the said reflector integrally with the upper surface of an upper crosspiece. For example, the upper surface of the upper rail may be mirror-coated or integrated by plating. Moreover, you may attach the said reflector separately from the upper surface of the upper crosspiece. For example, a mirror tape may be affixed, and a mirror plate may be fixed. Moreover, it is preferable that the receiving lens of the infrared receiver is directed downward to a limit angle at which direct light can be received.

  The invention according to claim 1 is as described above, and in particular, receives the direct light from the infrared transmitter and the diffusely reflected light in which the diffused light irradiated with the direct light is reflected by the reflector. Therefore, even if a plurality of LEDs are not used, a single LED can be used to prevent malfunction of the infrared detection unit.

  By integrating the above reflector with the upper surface of the upper rail and mirror-finishing it, it becomes possible to reflect diffused light with high reflectivity, and irradiate diffused light below the detection area of the conventional direct light linear orbit Since it can be expanded to the area of the angle, the plant hangs down due to strong winds, snowfall, etc., and even if the light is blocked directly, diffuse reflected light is received, the receiving unit does not judge that it is infrared blocking, Can be prevented. Further, the same effect as described above can be obtained by attaching the reflector as a separate body from the upper rail, for example, by attaching a mirror tape to the upper surface.

  By directing the receiving lens of the infrared receiving unit downward to a limit angle at which direct light can be received, it is possible to receive direct light and diffusely reflected light with low light intensity from below with high sensitivity.

  Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view showing a schematic configuration of an intrusion detection device according to the present invention. As can be clearly understood from FIG. 1, the infrared transmission unit 11 and the infrared reception unit 12 of the infrared detection unit 1 using LEDs (light emitting diodes) are opposed to the upper beam 3 of the fence 4 at a predetermined interval, and the upper beam between them. A mirror surface tape is attached to the upper surface of 3 as the reflector 2. The fence 4 is supported by a support pillar 6, and the infrared receiver 12 is connected to the alarm device 5 by wiring 7 (see FIG. 6) described later.

  FIG. 2 is an explanatory diagram showing an optical path of infrared rays from the LED used as the infrared transmission unit 11. From the transmission lens 111, the direct light a and the diffused light diffused at a constant irradiation angle (α in FIG. 2). It shows that two types of infrared rays b1 are transmitted. At this time, the receiving lens 121 of the infrared receiving unit 12 is directed to the limit angle at which the direct light a can be received, and the diffuse reflected light b2 reflected by the reflector 2 together with the direct light a is as sensitive as possible. It can be received.

  FIG. 3 is an explanatory diagram for explaining the alarm transmission when a suspicious person enters the detection area. In FIG. 3, since the suspicious person climbs the fence, the direct light a is blocked by the head or the body, and the diffused light b <b> 1 and the diffuse reflected light b <b> 2 are also blocked by the hand, arm, body, etc. Detects infrared blockage. As a result, the infrared receiving unit 12 determines that the infrared ray is blocked by the suspicious person, activates the alarm device 5, and notifies the householder of the suspicious person invasion by means of sound, light, or the like.

  FIG. 4 shows a case where planting or the like directly blocks light a due to strong winds or snowfall. At this time, the infrared receiving unit 12 detects the blocking of the direct light a, but the diffused light b1 that has passed below the branches and leaves is reflected by the reflector 2 and received as diffusely reflected light b2 by the infrared receiving unit 12. At this time, if a level slightly lower than the light intensity of the diffusely reflected light b2 is set as a threshold for alarm transmission, the infrared receiver 12 does not operate the alarm 5 and enters a standby state. Thereafter, when the branches and leaves are removed by returning from the upper part of the upper rail 2 to the original position, the infrared receiving unit 12 directly receives the light a and becomes a normal state, thereby preventing malfunction.

  When a relatively large bird such as a crow stops on the reflector 2 of the upper rail 3, the state is the same as in FIG. 4, the trunk directly blocks the light a, and the infrared receiver 12 detects the direct light a blocking. To do. However, the diffused light b <b> 1 and the diffusely reflected light b <b> 2 are not completely blocked because the leg portions of the crow are thin, but are received by the infrared receiver 12. As a result, the infrared receiver 12 does not operate the alarm device 5 and enters a standby state. Thereafter, when the crow flies away, the infrared receiving unit 12 directly receives the light a and enters a normal state, thereby preventing malfunction.

  FIG. 5 is an explanatory diagram for explaining alarm transmission when a relatively small bird such as a sparrow stops on the reflector 2 of the upper rail 3. At this time, the diffused light b1 and the diffusely reflected light b2 are blocked by the sparrows, but the direct light a passing above is received by the infrared receiver 12 without being blocked. Since the light intensity of the direct light a is much higher than the alarm transmission threshold, the infrared receiver 12 does not operate the alarm device 5 and can prevent malfunction. The same applies when dead leaves or fallen leaves remain on the reflector 2, and the alarm device 5 does not operate, and malfunction can be prevented.

  FIG. 6 is a partial perspective view showing the infrared receiving unit 12 of the infrared detection unit 1. The receiving lens 121 is directed downward as much as possible to receive the direct light a, and the light intensity reflected by the reflector 2 is weakly diffused. It arrange | positions so that the reflected light b2 can be received as highly sensitive as possible. In addition, wiring 7 such as a communication line to a power line, an alarm transmitter circuit, a threshold setting circuit, etc. is inserted through the support pillar 6 so that it does not deteriorate even if it is exposed to the outdoor environment for a long time. .

It is a front view which shows schematic structure of the intrusion detection apparatus concerning this invention. It is explanatory drawing which shows the optical path of the infrared rays from LED. It is explanatory drawing explaining the alarm transmission when a suspicious person invades a detection area. It is explanatory drawing which shows an optical path when direct light is interrupted | blocked and diffuse reflected light is received. It is explanatory drawing which shows an optical path when a diffused light and a diffuse reflected light are interrupted | blocked, and a direct light is received. It is a fragmentary perspective view which shows the infrared receiving part of an infrared detection unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Infrared detection unit 11 Infrared transmission part 111 Transmission lens 12 Infrared receiving part 121 Reception lens 2 Reflector 3 Upper rail 4 Fence 5 Alarm 6 Support pillar 7 Wiring a Direct light b1 Diffuse light b2 Diffuse reflected light

Claims (4)

  In a detection device that is installed on the fence of the fence and includes an infrared transmission unit and an infrared reception unit, and an alarm device, the upper beam between the infrared transmission unit and the infrared reception unit that faces the infrared transmission unit. A reflector is provided on the upper surface of the light source, and the infrared receiver detects the direct light from the infrared transmitter and the diffusely reflected light reflected by the reflector with the direct light. Intrusion detection device.   The intrusion detection device according to claim 1, wherein the reflector is integrated with an upper surface of the upper rail.   The intrusion detection device according to claim 1, wherein the reflector is separate from the upper surface of the upper rail.   The intrusion detection device according to claim 1, wherein the receiving lens of the infrared receiver is directed downward to a limit angle at which direct light can be received.

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