JP3617342B2 - Method for varying number of detection areas and security sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for changing the number of detection areas in which the number of detection areas can be increased and decreased, and a security sensor thereof.
[0002]
[Prior art]
Conventionally, an infrared light receiving element such as a pyroelectric element that performs electrical output according to the amount of received light, and a lens block including a plurality of lens systems for forming a plurality of detection areas having a focus on the infrared light receiving element; There is known a security sensor including a plurality of beam-shaped detection areas.
[0003]
[Problems to be solved by the invention]
However, in the conventional security sensor, the lens block is fixed to the housing, and the detection beam cannot be increased or decreased. For this reason, when it is desired to increase the number of detection areas after the construction of the security sensor, it is impossible to cope with it, and there is a problem that the security sensor can only be added and it is inconvenient.
[0004]
The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to easily increase or decrease the number of detection areas even after construction. It is to provide the security sensor.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a housing having an opening window and an infrared light receiving element that is housed in the housing and performs electrical output in accordance with the amount of received light. And a method of varying the number of detection areas of a security sensor comprising a lens block having a plurality of lens systems for forming a plurality of detection areas having a focus on the infrared light receiving element, the infrared light receiving element and the lens The block is integrated to form an infrared light receiving block, and the infrared light receiving block can be protruded and retracted with respect to the opening window of the housing.
[0006]
In the invention of claim 2, a housing having an opening window, an infrared light receiving element that is housed in the housing and performs electrical output in accordance with the amount of received light, and a plurality of focal points on the infrared light receiving device A security sensor comprising a lens block having a plurality of lens systems for forming a detection area, the infrared light receiving block integrating the infrared light receiving element and the lens block, and the infrared light receiving block. The present invention is characterized in that there is provided a detection area number adjusting unit for increasing and decreasing the number of detection areas by appearing in and out of the opening window of the body.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a detection area number varying method and a security sensor thereof according to the present invention will be described in detail with reference to FIGS. 1 and 2. 1A and 1B are explanatory views showing a case where the number of detection areas of the security sensor is increased, FIG. 1A is a side view showing the security sensor, and FIG. 1B is a side view showing the detection area. 2A and 2B are explanatory views showing a case where the number of detection areas of the security sensor is reduced. FIG. 2A is a side view showing the security sensor, and FIG. 1B is a side view showing the detection area. In FIG. 1 and FIG. 2, the symbol () indicates the lens system and the detection area on the side that cannot be seen from the front direction.
[0008]
As shown in FIG. 1 or 2, the security sensor includes a housing 1. The housing 1 has a rectangular box shape made of a light-shielding synthetic resin that is attached to a ceiling or a wall surface, and includes an opening window 10. The infrared light receiving block 2 is provided in the open window 10 so as to be able to appear and retract through a detection area number adjusting unit 3 configured by a technique such as screwing. The infrared light receiving block 2 is obtained by integrating the infrared light receiving element A and the lens block B. As the infrared light receiving element A, a pyroelectric element that receives an infrared ray and generates an electromotive voltage according to a rate of change in temperature is used.
[0009]
The lens block B is a substantially dome-shaped polyethylene resin that transmits infrared rays but cannot be seen with the naked eye, and includes a plurality of lens systems B _1, ... B ₁₂ . Each of the lens systems B _1, ... B ₁₂ is a Fresnel lens in order to reduce the thickness and weight. Each of the lens systems B _1, ... B ₁₂ has an optical axis passing through the infrared light receiving element A, and is disposed so as to be focused on the infrared light receiving element A. Therefore, the lens system _{B 1,} ... _{B 12,} each lens system _{B 1,} ... along the optical axis of the _{B 12,} detection area _{C 1} of each independent of the beam-like, to form a ... _{C 12.} In the lens block B of the security sensor, lens systems B _1, ... B ₄ are formed on the dome-shaped substantially hemispherical portion, and lens systems B ₅ ,. B ₁₂ is formed.
[0010]
In the security sensor configured as described above, the number of detection areas is increased or decreased as follows. That is, the lens block B is rotated clockwise, retracting the lens block B to the opening window 10 along the detection area number adjusting unit 3, the state as shown in FIG. 2, i.e. the lens system B _5, ... B ₁₂ the opening window by the state entered into 10, the number of detection areas, the lens system B _1, ... detection area C ₁ for the formation of B _4, can be 4 areas ... C _4.
[0011]
On the other hand, the lens block B is rotated counterclockwise, the lens block B along the detection area number adjusting unit 3 is projected through a window 10, the state shown in FIG. 1, i.e. the lens system B _5, a ... B ₁₂ by the state that issued out of the opening window 10, the number of detection areas, the lens system _{B 1,} ... detection area _{C 1} for the formation of _{B 4,} ... to the four areas of the _{C 4,} the lens system _{B 5,} ... B ₁₂ detection areas C _5, ..., C ₁₂ can be made into 12 areas.
[0012]
Also, in this intrusion detection sensor, an infrared light-receiving element A and the lens block B is integral, so infested with respect to the opening window 10, the size each area of each detection area C _1, ... C ₁₂ is Hardly changes.
[0013]
In the above-described security sensor, the detection area number adjusting unit 3 has a screw structure, but is not limited to the screw structure, and a slide structure or the like may be employed.
[0014]
【The invention's effect】
According to the first aspect of the present invention, there is an effect that it is possible to provide a method for changing the number of detection areas that can easily increase or decrease the number of detection areas as needed even after construction, and that is excellent in usability.
[0015]
According to the second aspect of the present invention, it is possible to provide a crime prevention sensor that can easily increase or decrease the number of detection areas as needed even after the construction, and that is excellent in usability.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a case where the number of detection areas of a security sensor according to an embodiment of the present invention is increased.
FIG. 2 is an explanatory diagram showing a case where the number of detection areas of the security sensor according to the embodiment of the present invention is reduced.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing | casing 10 Opening window 2 Infrared light receiving block 3 Detection area number adjustment part A Infrared light receiving element B Lens block B _n lens system (However, n is an integer of 1, ... 12)

Claims (2)

A housing having an aperture window, an infrared light receiving element that is housed in the housing and performs electrical output in accordance with the amount of light received, and a plurality of lens systems for forming a plurality of detection areas having a focus on the infrared light receiving device A method of varying the number of detection areas of a security sensor comprising a lens block comprising: an infrared receiving block integrated with the infrared receiving element and the lens block, the infrared receiving block being an opening window of the housing A method for varying the number of detection areas, characterized in that it can appear and disappear. A housing having an aperture window, an infrared light receiving element that is housed in the housing and performs electrical output in accordance with the amount of light received, and a plurality of lens systems for forming a plurality of detection areas having a focus on the infrared light receiving device A security block comprising: a lens block comprising: an infrared light receiving block in which the infrared light receiving element and the lens block are integrated; and detecting the infrared light receiving block by intruding into an opening window of the housing A security sensor comprising a detection area number adjusting unit for increasing or decreasing the number of areas.

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