JPS61126435A - Heat ray detector - Google Patents

Abstract

PURPOSE:To easily confirm plural detection areas by providing nonreflection type light transmission parts for detection area confirmation to plural light condensers provided opposite a heat ray sensor so that lines connecting the light transmission parts and a light emitting device for detection area confirma tion are parallel to the optical axes of the detection areas. CONSTITUTION:The pyroelectric element 11 as the heat ray sensor is provided to a substrate 12 and an LED13 as the light emitting device for detection area confirmation is provided nearby. Then, colored filters 15a, 15b, and 15c as the nonreflection type light transmission parts are fitted to Fresnel lenses 14a, 14b, and 14c as provided to the pyroelectric element 11 as the light condensers. Then, the optical paths 18a, 18b, and 18c connecting the LED13 and filters 15a, 15b, and 15c are made parallel to the optical axes of the 1st, the 2nd, and the 3rd detection areas 16a, 16b, and 16c.

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to the passage or presence of people or objects, especially the intrusion of suspicious persons,
It also relates to technology for confirming the detection area of a heat ray detector used to detect the occurrence of a fire.

[Background technology]

1. In Figures 3 and 4. A second conventional example will be shown.

In FIG. 3 showing the first conventional example, ■ is a rotary table, 2 is a pyroelectric element as a heat ray sensor attached to the rotary table 1, and 3 is a detection device attached to the rotary table 1 on the opposite side of the pyroelectric element 2. LED 4, which serves as a light emitter for area confirmation, is a parabolic mirror.

The pyroelectric element 2 and the LED 3 are located at symmetrical positions with respect to the rotation axis 1a of the rotary table 1. In the state shown in Figure (A), the LED 3 is located at the focal point of the parabolic mirror 4, and in the state shown in Figure (B) In this state, the pyroelectric element 2 is located at the focus of the parabolic mirror 4. The diagram (A) shows the case where the detection area is confirmed, and the detection area A is detected by the light @a.
Check. When the optical path a is not in the desired detection area A, the overall direction and position of the heat ray detector is adjusted so that the optical path a is in the detection area A.

Figure (B) shows the hot ray detection state of the hot ray detector placed as described above. If there is a heat ray source in detection area A,
The heat ray passes through the optical path a, is reflected by the parabolic mirror 4, and is focused on the pyroelectric element 2. When the pyroelectric element 2 receives a heat ray, it converts it into an electric signal and operates a predetermined device. For example, operate alarms, shutters, doors, etc.

This first conventional example has a structure in which a table 1 on which a pyroelectric element 2 and an LED 3 are attached is configured to rotate, and a parabolic mirror 4
Since it uses , it has the problem of high cost.

Furthermore, when confirming the detection area A and when setting the pyroelectric element 2, the LED 3 and the pyroelectric element 2 are connected to the parabolic mirror 4.
The problem is that it must be precisely aligned with the focal point of the object, making it difficult to operate.

Furthermore, even if the detection area was to be confirmed, only a single detection area could be confirmed.

In FIG. 4 showing the second conventional example, 5 is a substrate, 6 is a pyroelectric element attached to the substrate 5, and 7 is an LE for checking the detection area.
I) (light emitting diode), 8 is a first Fresnel lens as a condenser, and 9 is a second Fresnel lens connected to an end of the Fresnel lens 8.

Although this heat ray detector has a simple structure, there is a problem in that the detection area can only be confirmed for one detection area B, although it has a plurality of (two) Fresnel lenses.

[Purpose of the invention]

An object of the present invention is to provide a hot-wire type detector that has a simple structure, is inexpensive, and can easily confirm any of a plurality of detection areas.

[Disclosure of the invention]

The heat ray detector of the present invention includes a heat ray sensor, a plurality of light concentrators provided opposite to the heat ray sensor, a light emitting device for detecting a detection area provided near the heat ray sensor, and a plurality of light concentrators provided in the vicinity of the heat ray sensor. a non-refracting transparent part for detecting area confirmation provided on each of the condensers on a line drawn from the light emitter for detecting area confirmation so as to be substantially parallel to the optical axis of each detection area; It is prepared.

In this configuration, "non-refracting type" does not mean that it does not refract light at all, but rather that it refracts light almost less than a condenser, and does not deny even a slight refraction.

The effects of the configuration of this invention are as follows.

(al) Since each of the plurality of condensers is provided with a non-refraction type light-transmitting part for checking the detection area, it is possible to easily check the plurality of detection areas.

In other words, when looking at the non-refracting transparent section of one condenser, the light emitted from the detection area confirmation light emitting device through the non-refracting transparent section is aligned with the optical axis of the detection area of the condenser. parallel. Therefore, if you visually recognize the light that has passed through the non-refracting transparent part, the optical axis of the detection area of the condenser corresponding to this light will be aligned with the position where this light was visually observed and the light source (for confirmation of the detection area). It can be easily determined that it is on the line connecting the light emitter).

If the position and direction of the optical axis of the detection area are known, the position, direction, and general range of the detection area itself can be recognized.

Such a relationship also applies to the non-refracting light-transmitting portion of each condenser, and as a result, it is possible to easily check a plurality of detection areas.

(bl) The configuration for achieving the effect of (8) above is as follows:
(i) Each of the plurality of light concentrators is provided with a non-refraction type light-transmitting part for checking the detection area, ('ii') The position where each non-refraction type light-transmission part is provided on the corresponding light collector is as follows. A simple method that only requires that the line connecting the non-refracting transparent part and the light emitting device for confirming the detection area be in a position that is substantially parallel to the optical axis of the detection area. In addition, compared to the first conventional example, the structure can be significantly simplified and costs can be reduced.

Next, some useful embodiments of this invention will be described.

■ The non-refracting transparent part for checking multiple detection areas has different colors and different transmitted light patterns (for example, one is simple light and the other is striped light) for visual identification. compose into things.

In this way, the degree of recognition of the one-to-one correspondence between each detection area and the non-refractive translucent portion for confirmation of the detection area increases, and the confirmation and identification of the detection area becomes easier.

(2) A pyroelectric element is suitable as a heat ray sensor, and a Fresnel lens is suitable as a condenser.

However, materials other than these may also be used.

Embodiment An embodiment of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 is a side view, and FIG. 2 is a perspective view.

A pyroelectric element 11 as a heat ray sensor is provided on a substrate 12, and an LED (light emitting diode) 13 as a light emitting device for confirming a detection area is provided on the substrate 12 near the pyroelectric element 21.

14a, 14b, and 14c are Fresnel lenses as condensers provided facing the pyroelectric element 11, and these Fresnel lenses 14a, 14b.

14C, colored filters 15a, 15b, and 15c are provided as non-refractive light transmitting parts, respectively. These colored filters 15a, 15b, and 15c have different colors, and this difference in color makes the detection areas 16a, 16b, and 16c highly distinguishable.

The optical axes of each detection area], 6a, 16b, and 16c are 17a, 17b, and 17c, respectively.

L ED], 3 and the first colored filter 15a, that is, the first optical path 18a is the first detection area 1.
6a], so as to be substantially parallel to 7a,
Fresnel lens 14 of this first colored filter 15a
The position at a is determined.

Similarly, the line connecting the LED 13 and the second colored filter 15b, that is, the second optical path 18b, is connected to the second detection area 1.
The position of this second colored filter 15b in the Fresnel lens 14b is determined so that it is parallel to the optical axis 17b of the filter 6b.

Further, the line connecting the LED 13 and the third colored filter 15C, that is, the third optical path 18c, is connected to the third detection area 16.
The position of this third colored filter 15C in the Fresnel lens 14c is determined so that it is parallel to the optical axis 17t- of the lens.

It is clear that this embodiment provides the effects of the configuration of the invention described above.

〔Effect of the invention〕

According to this invention, there are the following effects.

fa) Looking at the non-refracting transparent section of one of the multiple concentrators, the optical path of the light that exits from the detection area confirmation light emitting device through the non-refracting transparent section is It is parallel to the optical axis of the detection area of the concentrator. Therefore, if you visually recognize the light that has passed through the non-refracting transparent part, the optical axis of the detection area of the condenser corresponding to this light will be aligned with the position where this light was visually recognized and the light source (for confirmation of the detection area). It can be easily determined that the line connecting the

If the position and direction of the optical axis of the detection area are known, the position, direction, and general range of the detection area itself can be recognized.

Such a relationship applies to each non-refracting light-transmitting portion of each condenser, and as a result, it is possible to easily check a plurality of detection areas.

The configuration for exerting the effect of (bl above fa) is as follows:
(1) Each of the plurality of light concentrators should be provided with a non-refracting transparent section for checking the detection area; (ii) The position of each non-refracting light transmitting section on the corresponding light concentrator should be This is a simple method that only requires that two conditions be satisfied: the line connecting the refractive translucent part and the light emitter for filling the detection area is located in a position that is substantially parallel to the optical axis of the detection area. , compared to the first conventional example, the structure can be significantly simplified and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a perspective view, and FIGS. 3(A) and 3(B) are side views of a first conventional example.
FIG. 4 is a side view of the second conventional example. 11... Pyroelectric element (heat ray sensor), 13... LED
(Light emitter for detection area confirmation) 14a, 14b, 14c・
... Fresnel lens (concentrator L, 15a, 15b, 15
c... colored filter (non-refractive type transparent part), 16a,
16b. ] 6 c--Detection area, 17a, 17b, 1
1cm...optical axis

Claims (5)

[Claims] (1) A heat ray sensor, a plurality of light concentrators provided opposite to the heat ray sensor, a light emitter for detecting area confirmation provided near the heat ray sensor, and each detection area for the plurality of light collectors. and a non-refracting transparent part for detecting the detection area provided in each of the condensers on a line drawn from the light emitting device for confirming the detection area so as to be substantially parallel to the optical axis of the detector. . (2) The non-refractive transparent portion for confirming the plurality of detection areas is visually identified.
Heat ray detector described in ). (3) The heat ray detector according to claim (2), wherein the visual identification means is based on different colors of the non-refracting transparent portions for confirming the plurality of detection areas. (4) The heat ray detector according to claim 1, wherein the heat ray sensor is a pyroelectric element. (5) The heat ray detector according to claim (1), wherein the condenser is a Fresnel lens.