JP2004184372A - Aiming mechanism of sensor camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the adjustment work of the monitoring range of a surveillance camera and a passive infrared sensor in a sensor camera comprising the surveillance camera, an illuminating light source and the passive infrared sensor. <P>SOLUTION: A near-infrared light emitting diode as a light source is placed at the position of an infrared detecting device of the passive infrared sensor. A section is illuminated with light, which is emitted from the near-infrared light emitting diode and is projected through a light condensing optical system of the passive infrared sensor, and is photographed by the surveillance camera to allow the checking of the monitoring orientations of the passive infrared sensor. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a monitoring direction confirmation means for a passive infrared sensor, that is, a so-called aiming mechanism, in a sensor camera including a monitoring camera, an illumination light source, and a passive infrared sensor.
[0002]
[Prior art]
As the aiming mechanism of the passive infrared sensor, a system is used in which a light source is provided in proximity to an infrared detection element and the position of the infrared detection element and the light source is switched with respect to the focus of a lens or a reflecting mirror. The contents are disclosed in Japanese Utility Model Laid-Open No. 56-15287. A plurality of infrared focusing axes (generally called detection zones) each composed of one infrared detector and a multi-optical axis optical system that focuses infrared light on the infrared detector are usually invisible to human eyes. For this reason, a light source such as a red light emitting diode is placed at the position of the infrared detection element to realize the visualization of the detection zone. When a red light emitting diode is placed at the position of the infrared detection element and lit, and the passive infrared sensor is viewed from within the detection zone, the corresponding optical system (lens or reflector) appears to glow red. This is based on the principle that nothing can be seen when a passive infrared sensor is viewed.
[0003]
[Problems to be solved by the invention]
Although the aiming mechanism of such a passive infrared sensor is revolutionary in that the direction of the invisible detection zone can be recognized, the direction adjustment using the same is performed in the monitoring area of the passive infrared sensor. Walk around the inside with an approximate aim, find the position where the reflector looks shining, fine-tune the direction, search and adjust for each zone until the direction of all zones is appropriate It is a very time-consuming task to repeat. In a sensor camera having a surveillance camera and a passive infrared sensor, not only the direction of the detection zone of the passive infrared sensor but also the relationship with the direction in which the surveillance camera is directed must be grasped and adjusted. If one tries to set the orientation of both devices exactly as intended, the amount of work is enormous.
[0004]
[Means for Solving the Problems]
In order to simplify such adjustment work, the present invention places a near-infrared light emitting diode as a light source at the position of the infrared detecting element and emits a light from the near-infrared light emitting diode to a condensing optical system of a passive infrared sensor. The part illuminated by the light projected through the camera is photographed by a surveillance camera to check the monitoring direction of the passive infrared sensor.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The sensor camera has a surveillance camera, a plurality of near-infrared light-emitting diodes as light sources for illumination, and a passive infrared sensor. Is possible. As an image sensor of the surveillance camera, an image sensor having good sensitivity in the near infrared region in addition to the visible region is used. In an environment where the illuminance is very low (dark), a plurality of near-infrared light emitting diodes emit near-infrared light as an illumination light source, thereby illuminating a monitoring target reaching an imaging device of a monitoring camera, and monitoring video. Is formed. Therefore, the person (intruder) is not conscious of being monitored and photographed at all.
[0006]
FIG. 1 is an explanatory diagram showing a use state of the aiming mechanism of the sensor camera of the present invention. A sensor camera having a built-in passive infrared sensor 1 and a monitoring camera 2 is fixed at the upper center, and monitors the entire room in the right direction in the figure. A passive infrared sensor 1 and a surveillance camera 2 are fixed to the cylindrical base 3 side, and the exposed portions of these two devices are covered with a dome-shaped cover 4. The figure shows a state in which the cover 4 is opened, G is the vertical angle of view of the surveillance camera 2, and P is the central detection zone of the passive infrared sensor 1.
[0007]
FIG. 2 is an enlarged sectional view of the passive infrared sensor 1. 11 is an infrared sensor, and 12 is a reflecting mirror. The reflecting mirror 12 forms five detection zones extending in a fan shape in the horizontal direction, and infrared energy from five directions is collected by the infrared sensor 11 disposed at the focal position. A signal output from the infrared sensor 11 is processed by a signal processing unit (not shown), and a detection signal is output in response to a change in the signal exceeding a predetermined value. Reference numeral 13 denotes a printed circuit board on which a near-infrared light emitting diode for aiming is mounted. When the passive infrared sensor 1 is in the alert state, the passive infrared sensor 1 is placed at a position so as not to block the optical path for collecting infrared energy, and is turned off. Has become. FIG. 2A shows this state. FIG. 2B shows a state in which the printed circuit board 13 on which the near-infrared light emitting diode is mounted is placed in front of the light receiving window of the infrared sensor 11. At this time, the near-infrared light emitting diode is in a lighting state.
[0008]
When the sensor camera having such a configuration is installed in a room to be monitored, the sensor camera is mounted at a predetermined position, and necessary wiring such as a power supply line and a signal output line is performed so that the sensor camera can be started at any time. . The adjustment of the device is performed in a state where the ambient illuminance is low (darkness). Activate the sensor camera, display the video signal output from the surveillance camera on the monitor brought in for adjustment work, and check this screen near the sensor camera.
[0009]
First, a near-infrared light emitting diode (not shown) for illumination built in the sensor camera is turned on, and the direction of the monitoring camera 2 is adjusted while checking the image of the monitoring target illuminated thereby by the monitor. Next, in the passive infrared sensor 1, as shown in FIG. 2B, the printed circuit board 13 on which the near-infrared light emitting diode for aiming is mounted is placed on the front surface of the light receiving window of the infrared sensor 11, and this is turned on. Then, the near-infrared light emitting diode for illumination is turned off. Then, a screen as shown in 5 of FIG. 1 is displayed on the monitor screen. The light projected from the near-infrared light emitting diode on the printed board 13 is reflected by the reflecting mirror 12 and spreads in a fan shape along the five detection zones. The part illuminated by the projected light is brightly projected on the screen of the monitor. The other portions are displayed in black because the near-infrared light emitting diode for illumination is turned off. The brightly projected portion indicates the location where the detection zone of the passive infrared sensor 1 has reached.
[0010]
When the direction of the passive infrared sensor 1 is changed, the brightly projected portion of the screen moves accordingly. While watching the movement, fine-tune the direction and set it to the optimal condition for detecting an intruder. What is displayed on the monitor screen of FIG. 1 is the state after the adjustment. The middle detection zone P among the five detection zones reaches the waist from the chest of the person M standing in the center of the room. Two detection zones can be confirmed near the door D located on the left front side as viewed from the sensor camera, and two detection zones can also be confirmed on the right front side. In this state, if a person intruding from the door D goes straight and along the wall, it will go through three detection zones. Will cross. No matter which direction the intruder enters from the door D and moves in either direction, the intruder will cross at least one detection zone, and in this setting state, the passive infrared sensor 1 will not miss the intruder.
[0011]
In this embodiment, a passive infrared sensor having five detection zones has been described, but a so-called three-dimensional sensor having another or two fan-shaped detection zones below the five detection zones. If a passive infrared sensor of the alert type is used, more strict alertness is realized. The aiming mechanism of the present invention can also be realized in a sensor camera incorporating such a passive infrared sensor having many detection zones. In this case, the number of detection zones increases within the range of the vertical angle of view G of the surveillance camera 2, and the brightly projected portion increases so as to fill the monitor screen 5.
[0012]
When a series of direction adjustment operations are completed, the printed circuit board 13 on which the near-infrared light emitting diode for aiming is mounted is removed from the front surface of the light receiving window of the infrared sensor 11, and the state is returned to the state shown in FIG. Let it. Then, the near-infrared light emitting diode for lighting is turned on, and the mode is shifted to the monitoring mode. When the printed circuit board 13 on which the near infrared light emitting diode for aiming is mounted is placed in front of the light receiving window of the infrared sensor 11, the near infrared light emitting diode for aiming is turned on and the near infrared light emitting diode for lighting is turned off. Is performed at the same time, and in conjunction with removing the printed circuit board 13 on which the near infrared light emitting diode for aiming is mounted from the front surface of the light receiving window of the infrared sensor 11, turning off the near infrared light emitting diode for aiming, If the lighting of the near-infrared light emitting diode for lighting is performed at the same time, the operation is simplified.
[0013]
【The invention's effect】
According to the aiming mechanism of the sensor camera of the present invention, the portion illuminated by the light spreading along the detection zone is brightly projected on the monitor screen, so that the monitoring range of the surveillance camera and the passive infrared sensor The adjustment can be performed while simultaneously checking the monitoring range and the relative positions of the two monitoring ranges. As a result, the troublesome work of walking around the monitoring area of the passive infrared sensor while roughly making a rough search and searching for a position where the reflector can be seen shining is omitted, and the time required for adjustment is greatly reduced.
[0014]
Adjustment work by providing a mechanism to stop the light emitted from the illumination light source in conjunction with the operation of moving the aiming light source to a position near the infrared detection element of the passive infrared sensor or to replace the infrared detection element The switching between the mode and the monitoring mode is performed smoothly, and the work efficiency is improved.
In the description of the embodiment of the present invention, a near-infrared light emitting diode is used as a light source for aiming, but it is a light source within a response sensitivity wavelength region of an image sensor of a monitoring camera, and a detection zone of a monitor screen is displayed. The position is not limited to this as long as the position has a light emission intensity enough to be projected brightly.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a use state of an aiming mechanism of a sensor camera according to the present invention.
FIG. 2 is an enlarged sectional view of the passive infrared sensor 1 constituting the aiming mechanism of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Passive infrared sensor 2 ... Surveillance camera 3 ... Base 4 ... Cover 5 ... Monitor screen 11 ... Infrared sensor 12 ... Reflector 13 ... Near-infrared light emission Printed circuit board P on which diode is mounted ... Detection zone G in the middle of passive infrared sensor G ... Vertical angle of view of surveillance camera 2 M ... Human D ... Door

Claims (2)

In a sensor camera including a monitoring camera, a light source for illumination, and a passive infrared sensor, a near-infrared light emitting source is provided near the infrared detecting element of the passive infrared sensor or at a position replacing the infrared detecting element. A portion emitted from a light emitting source and illuminated by light projected through the condensing optical system of the passive infrared sensor is photographed by the surveillance camera to confirm the monitoring direction of the passive infrared sensor. Aiming mechanism for a sensor camera. The aiming mechanism of the sensor camera according to claim 1, further comprising a mechanism for stopping light emitted from the illumination light source in conjunction with an operation for turning on the near-infrared light emitting source.

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