JP3191423B2 - Hot wire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-wire detector mounted on a construction surface to detect the presence of a human body or the like.

[0002]

2. Description of the Related Art In a hot-wire detector, a hot ray coming from a plurality of detection areas is received by a first reflecting mirror, reflected by a second reflecting mirror, and is reflected by the second reflecting mirror. The heat ray sensing element of the sensor circuit is further reflected and converged, and when the heat dose changes, a voltage corresponding to the rate of change is output as a signal from the heat ray sensing element. There is a hot-wire detector that outputs an alarm when it is present.

FIGS. 4 and 5 are cross-sectional views of essential parts for explaining a conventional example of the above-described hot-wire detector. First, the hot-wire detector shown in FIG. 4 will be described. In FIG. 4, reference numeral 1 denotes a planar collective reflector corresponding to a first reflector, 2 denotes a parabolic reflector corresponding to a second reflector, and 3 denotes a pyroelectric element corresponding to a heat ray sensing element. The planar collective reflector 1 is formed by joining a plurality of planar specular reflectors 1 _a, 1 _b, 1 _c, 1 _d, ... Into a Mt. Fuji shape, and has a substantially circular opening at the top. I have. The parabolic reflector 2 is disposed so as to be held forward of the top of the flat-shaped reflector 1 having a shape of Mt. Fuji, and has a mirrored paraboloid of revolution. The pyroelectric element 3 outputs a voltage corresponding to the rate of change of the received heat dose when the received heat dose changes. The pyroelectric element 3 is disposed at the center of the opening at the top of the flat-shaped reflector 1 having the shape of Fuji. Note that the pyroelectric element 3 is disposed so as to be at the focal position of the parabolic reflector 2.

[0004] The hot-wire detector shown in FIG.
Arrangement of a plane assembly reflector 1, a parabolic reflector 2, and a pyroelectric element 3
Depending on the installation relationship, a part of the flat collective reflection plate 1 is formed.
Mirror reflector 1_aIndicates the detection area A, and the specular reflection plate 1_bIs
The detection area B is set to the specular reflection plate 1 _cIs the detection area C (not shown)
) Are formed as detection areas, respectively.
It has been like that. Therefore, for example, intrusion into the detection area A
When an intruder enters, the heat rays received by pyroelectric element 3 by an intruder
The amount varies. Then, the pyroelectric element 3 changes the received heat dose.
A voltage corresponding to the conversion rate is output. Then, contact with the pyroelectric element 3
The connected sensor circuit (not shown)
It is determined whether the output voltage is higher than a predetermined level.
If the level is higher than a certain level, an alert is output as if there is an intruder
You do it.

Next, the hot-wire detector shown in FIG. 5 will be described. In FIG. 5, reference numeral 1 denotes a paraboloid of revolution reflecting plate corresponding to a first reflecting mirror, 2 denotes a parabolic reflecting plate corresponding to a second reflecting mirror, and 3 denotes a pyroelectric element corresponding to a heat ray sensing element. is there. The revolving parabolic reflector 1 is formed by joining several mirrored revolving parabolic pieces 1 _a, 1 _b, ... Obtained by cutting out a revolving paraboloid and forming a Mt. Fuji shape. A circular opening is provided. The parabolic reflector 2 is disposed so as to be in front of the top of the revolving parabolic reflector 1 in the shape of Mt. Fuji.
It has a mirrored paraboloid of revolution. The pyroelectric element 3 outputs a voltage corresponding to the rate of change of the received heat dose when the received heat dose changes. The pyroelectric element 3 is disposed at the center of the opening at the top of the Mt. I have. Note that the pyroelectric element 3 is disposed so as to be at the focal position of the parabolic reflector 2.

[0006] The hot-wire detector shown in FIG.
Rotating paraboloid reflector 1, parabolic reflector 2, and pyroelectric element 3
The arranged relationship between the rotational paraboloid piece 1 _a forms part of a paraboloid of revolution collection reflecting plate 1 is a detection region A, paraboloid piece 1 _b is not sensing area B (shown ), The rotation parabolic piece 1 _c forms a detection area C (not shown), and so on. Therefore, for example, when an intruder enters the detection area A, the heat dose received by the pyroelectric element 3 by the intruder changes. Then
The pyroelectric element 3 outputs a voltage according to the change rate of the received heat dose. Then, a sensor circuit (not shown) connected to the pyroelectric element 3 determines whether or not the output voltage of the pyroelectric element 3 is higher than a predetermined level. The alarm is output when there is a person.

[0007]

However, in the conventional hot-wire detector, the second hot-wire detector facing the hot-wire sensing element is not provided.
Is a paraboloid of revolution, the diameter of the second reflecting mirror must be substantially equal to the diameter R of the skirt of the first reflecting mirror, and becomes large. The number of surface elements of one reflecting mirror (first in the hot-wire detector shown in FIG. 4)
Surface elements the number of surface elements of the reflection mirror of the mirror reflector 1 _a, 1 _b, 1 _c, 1 _d, ... a number of, in the hot-wire detector shown in FIG. 5 of the first reflecting mirror Is the number of paraboloids of revolution 1 _a, 1 _b, ...)
There was a problem that this could not be achieved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to form the number of detection areas beyond the number of plane elements of the first reflecting mirror. Another object of the present invention is to provide a hot-wire detector in which a dead zone corresponding to a gap between detection areas is reduced.

[0009]

The present invention SUMMARY OF] In order to solve the above problems, reflects the heat rays from the plurality of detection areas
A first set of curved surface reflectors having a plurality of surface elements
Heat rays from the reflecting mirror and the first reflecting mirror were incident and received.
In the hot-wire detector and a second reflecting mirror for guiding the heat ray sensing element to the signal output in response to the hot wire amount, the second reflecting mirror, the surface number of the number said curved collection reflecting plate of the sensing area
In order to further increase the mirror surface,
It is characterized in that it is formed as a polyhedral plane mirror facing the.

[0010]

With the above arrangement, it is possible to form a larger number of detection areas than the number of detection areas provided in the first reflecting mirror.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a hot-wire detector according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a sectional view of a main part for explaining a hot-wire detector, FIG. 2 is a side view of a main part for explaining a hot-wire detector, and FIG. 3 is a main part for explaining the hot-wire detector. FIG.

1 to 3, reference numeral 1 denotes a first reflecting mirror .
A paraboloid of revolution reflector , equivalent to a curved reflector
Numeral 2 denotes a flat-plate reflecting plate corresponding to a polyhedral flat mirror serving as a second reflecting mirror, and numeral 3 denotes a pyroelectric element corresponding to a heat ray sensing element.

The rotating paraboloid reflector 1 cuts the paraboloid of revolution.
24 mirrored paraboloidal pieces 1_a1,1_a2,... 1
_a12,1_b1,1_b2,... 1_b12And joined to form Fuji Yamagata
A substantially circular opening is provided at the top. flat
The surface set reflection plate 2 is a revolving parabolic surface set reflection of the Fujiyama shape.
It is arranged as if it is over the top of the top of the plate 1 and is flat.
Mirror reflector 2_a,2_b1,2_b2,… 2_b12Join the dishes
It is a form. In addition, the specular reflection plate 2_aIs positive 12
The mirror-shaped reflector 2_b1,2 _b2,… 2
_b12Is the mirror reflector 2_aFrom one side of the regular dodecagon
Is bent in the direction of the parabolic reflector 1 and
Surface reflector 2_b1,2_b2,… 2_b12Is the mirror reflector 2_aWith one
It has been made to. In addition, the mirror reflector 2_aStood in the center of
Make sure that the vertical line exactly coincides with the heat ray sensing axis of pyroelectric element 3.
Has been.

The pyroelectric element 3 outputs a signal corresponding to the rate of change of the heat dose when the received heat dose changes. The pyroelectric element 3 is located at the center of the opening at the top of the Mt. It is arranged.

A hot-wire detector as described above has a paraboloid of revolution.
Arrangement of collective reflector 1, flat collective reflector 2, and pyroelectric element 3
Depending on the relationship, a part of the parabolic reflector 1 is formed
Rotating parabolic strip 1_a1,1_b1Is the mirror reflector 2_aAnd phase
The beam-shaped detection area A _1,B₁Form each
I have. Also, a paraboloid of revolution 1_b1Is the mirror reflector 2_b1With
Is a beam-shaped detection area C_b1Is also formed. Toes
Revolving parabolic piece 1_b1If you take a look at it, a flat set reflector
Two detections that converge the heat rays to the pyroelectric element 3 in combination with 2
Area B_1,C_b1Can be formed.

[0017] In the hot-wire detector embodiment, the parabolic piece _{1 a2, 1 a3, ... 1} a12, 1 b2, 1 b3, ... 1 b12 and the specular reflection plate 2 _a, 2 _b2, 2 _b3, ... the 2 _b12, there is a similar relation between the relationship of the respective aforementioned parabolic piece 1 _a1, 1 _b1 and a specular reflector 2 _a, 2 _b1. Therefore, the number of surface elements (rotational paraboloidal pieces 1 _a1, 1 _a2, ... 1 _a12, 1 _b1, 1 _b2, ... 1 _b12 ) of the paraboloid of reflector 1 corresponding to the first reflecting mirror is calculated as Even if it does not increase, by increasing the number of surface elements (mirror reflectors 2 _a, 2 _b1, 2 _b2, ... 2 _{b1 2} ) of the plane collective reflector 2 corresponding to the second reflector, the detection area is substantially increased. Can be increased, and in the hot-wire detector of the embodiment, although the surface prime number of the rotating paraboloid reflector 1 is 24, the number of detection areas is substantially 36. It can be made to have. In addition, the outer diameter of the flat collective reflector 2 can be made approximately half the outer diameter of the paraboloid of revolution.

The present invention is not limited to the above embodiment, and the first reflecting mirror may be another curved surface reflecting plate instead of a rotating parabolic surface reflecting plate. Further, the second reflecting mirror may be a flat-plate reflecting plate having a shape different from that of the embodiment, and more detection areas may be formed.

[0019]

Since the hot-wire detector of the present invention is constructed as described above, it is possible to form the number of detection areas exceeding the number of surface elements of the first reflecting mirror. There is an effect that it is possible to provide a hot-wire detector in which a dead zone corresponding to a gap between the region and the detection region is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a main part of a hot-wire detector according to an embodiment of the present invention.

FIG. 2 is a main part side view showing a hot-wire detector according to one embodiment of the present invention.

FIG. 3 is an essential part bottom view showing the hot-wire detector of one embodiment according to the present invention.

FIG. 4 is a sectional view of a main part showing an example of a conventional hot-wire detector.

FIG. 5 is a sectional view of a main part showing another example of a conventional hot-wire detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st reflection mirror 2 2nd reflection mirror 3 Heat ray sensing element A detection area B detection area C detection area

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 13/00-15/02 G01V 8/14

Claims (1)

(57) [Claims] 1. Reflecting heat rays from a plurality of detection areas ,
First reflection comprising a curved surface reflector having a plurality of surface elements
And mirrors, the heat rays from the first reflector is incident, received heat rays
In the hot-wire detector and a second reflecting mirror for guiding the heat ray sensing element to the signal output depending on the amount, the second reflecting mirror, the number of the detection region is the plane number of the curved collective reflector
To increase the mirror surface to the surface element of the first reflecting mirror
A hot-wire detector characterized by forming a multifaceted flat mirror .