JPH06337290A - Heat ray detector - Google Patents

Abstract

PURPOSE:To allow easy regulation of the total detecting region without sacrifice of detection sensitivity by providing mark sections corresponding to respective detecting regions onto the cover of a heat ray detector comprising a heat ray sensitive element, a heat ray converging means, and a heat ray transmitting cover. CONSTITUTION:Heat rays from a detecting region Ra4 transmit through the plane element Fa4 of a cover F and reflect on the mirror face element Da4 of an upper reflector D thence reflect on a lower reflector E and impinge on a heat ray sensitive element C while being converged. Heat rays from a detecting region Rb4 transmit through the plane element Fb4 of the cover F and reflect on the mirror face element Db4 of the reflector D thence reflect on the reflector E and impinge on the sensitive element C while being converged. Similarly, heat rays from detecting regions Ran, Rbn transmit through the plane elements Fan, Fbn and reflect on the mirror face elements Dan, Dbn thence reflect on the reflector E and impinge on the sensitive element C. In order to make insensitive the detecting regions Ran, Rbn in the direction possibly producing an erroneous alarm in the detection of invader or fire, the plane element is determined by putting masking labels, Ga, Gb on any one of the plane elements Fan, Fbn(n=1-12).

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 having a plurality of detection areas.

[0002]

2. Description of the Related Art In a heat ray type detector, heat rays incident from a detection area are passed through a heat ray converging means such as a reflecting mirror or a lens, and the heat rays are detected by a small heat ray sensing element (for example, a pyroelectric element) of a sensor circuit. ), The output voltage of the heat ray sensing element changes when the heat dose changes, and if the change in the output voltage is above a predetermined level, there is an intruder in the detection area or a fire. There is a hot-wire type detector that is set to issue a warning output.

Among the above-mentioned heat ray type detectors, the shape of the reflecting mirror and the combination of the reflecting mirrors are devised, or the combination of the lens and the reflecting mirror is devised, and the spot of a relatively small solid angle is obtained. There is one in which a large number of detection areas are formed to form a detection area having a wide solid angle as a whole. In such a hot-wire detector that has a large number of spot-like detection areas and has a wide solid-angle detection area as a whole, each spot-like detection area is set according to the situation of the installation site. In many cases, the detection area of the entire heat ray type detector is adjusted to be suitable for the site by enabling or disabling it for each spot-like detection area.

As described above, the conventional hot-wire type detector which adjusts the detection area of the whole hot-wire type detector by enabling or disabling each spot-like detecting area is spot-like. The valid / invalid processing of the detection area is performed as follows.

That is, a sheet-like material (masking label) that shields or absorbs heat rays is attached to a reflecting mirror or lens that is a heat ray converging means that is in charge of a spot-like detection area to be invalidated. Then, the heat rays incident from the spot-like detection area, which was covered by the heat ray converging means to which the masking label is attached, cannot reach the heat ray sensing element. Therefore, the spot-like detection area, which was covered by the heat ray converging means to which the masking label is attached, becomes invalid.

[0006]

However, when the masking label is attached to the heat ray converging means, the heat ray converging means can be applied not only when the attachment position is wrong and the attachment is made again, but also when the attachment is simply made. There is a problem that the original detection sensitivity cannot be obtained because dirt is attached to the means by hand or an adhesive agent, or the heat ray convergence means is distorted and the heat ray convergence position is deviated.

The present invention has been made to solve the above problems, and an object of the present invention is to easily adjust the detection area as a whole without impairing the original detection sensitivity. It is to provide a heat ray type detector.

[0008]

In order to solve the above-mentioned problems, the present invention provides a body base, a heat ray sensing element attached to the body base,
A heat ray converging means which is attached to the main body base and converges heat rays radiated from a plurality of detection areas to the heat ray sensing element, and detachably attached to the main body base in a uniquely fixed direction. In a heat ray type detector including a heat ray permeable cover that covers the heat ray sensing element and the heat ray converging means, the cover is provided with area sections serving as marks corresponding to the respective detection areas. .

Further, the invention according to claim 2 is characterized in that a masking label formed by applying an adhesive is attached to the heat ray shielding sheet of each size substantially corresponding to each of the area sections.

[0010]

With the above construction, in the invention according to the first aspect, since the cover is provided with the area sections serving as the marks corresponding to the respective detection areas, the heat ray converging means is directly masked. Instead of attaching the label, the masking label can be attached to the cover at hand, and then the cover can be attached to the main body base to adjust the detection area as a whole to a desired state. Therefore, the heat ray converging means is not contaminated and the heat ray converging position of the heat ray converging means is not deviated.

Further, in the invention according to claim 2, since a masking label cut into pieces in accordance with the area section is already attached, a masking label having a size suitable for a desired area section is simply added. The detection area as a whole can be easily adjusted to a desired state only by selecting and adhering it to the desired area section.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat ray detector according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is a partially crushed side view showing a main part of the heat ray type detector, FIG. 2 is a partially crushed side view showing a cover of the heat ray type detector, and FIG. 3 is a plan view showing a cover of the heat ray type detector. FIG. 4 is a plan view showing a masking label attached to the heat ray detector.

As shown in FIG. 1, the heat ray detector A comprises a main body base B, a heat ray sensing element C, an upper reflecting mirror D and a lower reflecting mirror E corresponding to heat ray converging means, and a cover F. ing. The main body base B is attached to a building material such as a ceiling or a wall surface, and is made of a synthetic resin having a flat, substantially heavenly cylindrical shape. The heat ray sensing element C is attached and fixed to approximately the center of the main body base B.

The upper reflecting mirror D and the lower reflecting mirror E are respectively
Made of an aluminum plate that is attached and fixed to the main body base B
It has a mirror finish by electropolishing.
The upper reflecting mirror D is twelve trapezoidal mirror elements D._a1,... D_a12
And the mirror element D_a1,... D_a1212 smaller boards
Shaped mirror element D_b1,... D_b12From a total of 24 mirror elements
It is configured. Mirror element D_a1And mirror element D_b1Is a mirror element
D_a1Upper edge and mirror element D _b1Common with the lower side of the junction mirror
Surface D_ab1Is formed. Eleven other bonded mirror surfaces D_ab2,
... D_ab12Is similarly formed. 12 such
Each bonded mirror surface D_ab1,... D_ab12On each side
They are joined together to form a ring-shaped approximately inverted Fuji surface. Downward reflector
E forms a bowl-shaped paraboloid of revolution. Upper reflector D
The center axis of the lower reflecting mirror E and the central axis of
The line sensing element C is located at the focal point on the rotation axis of the lower reflecting mirror E.
ing.

As shown in detail in FIGS. 2 and 3, the cover F is a molded product having a substantially hemispherical shape and is made of a synthetic resin having an excellent heat ray transmittance. Around the circular upper edge of the cover F,
Three locking pieces F are provided so that the cover F can be detachably attached to the inner peripheral edge of the lower end of the main body base B to cover the above-mentioned heat ray sensing element C, the upper reflecting mirror D, and the lower reflecting mirror E. ₁ is provided for each. However, the three locking pieces F
₁ is not provided at equal intervals with respect to the circular upper edge of the cover F. This is so that the cover F can always be attached to the main body base B in a uniquely fixed direction.

By the way, the outer surface of the cover F is smoothed with a substantially spherical curved surface over the entire surface. However, the inner surface of the cover F is a smooth spherical curved surface, 12 of the plane containing F _a1 of substantially _trapezoidal, an annular band F _a to ... F _a12, which are arranged in this annular,
12 plane containing F _b1 of approximately _trapezoidal, ... F _b12 is composed of the annular band F _b which continues to the annular. Moreover, the cover F
Is detachably attached to the main body base B to which the heat ray sensing element C, the upper reflecting mirror D, and the lower reflecting mirror E are attached and fixed, and is detachably attached to the plane base F _{a1 ,} . F _a12 specular element D _a1, relative ... D _a12, plane containing F _b1, ... F _b12 whereas specular element D _b1, ... D _b12, are as a state that uniquely opposed respectively.

[0017] Therefore, in the attached has been hot-wire detectors A cover F to the main base B, as shown in FIG. 1, the heat ray from the detection area R _a1 is transmitted through a plane containing F _a1 cover F together after being reflected on the mirror element D _a1 of the upper reflector D is reflected downward reflector E converges incident heat ray sensing elements C and heat ray from the detection area R _b1 is transmitted through a plane containing F _b1 of the cover F Then, after being reflected by the mirror element D _b1 of the upper reflecting mirror D, it is reflected by the lower reflecting mirror E and converges and enters the heat ray sensing element C. Similarly, the detection area R _a2, ... hot wire each plane containing F _a2 from R _a12, ... mirror element D _a2 passes through the F _a12, ... it is reflected downward reflector E after being reflected on the D _a12 with converging incident heat ray sensing element C, the detection region R _b2, ... downward reflection after heat rays respective planes containing F _b2 from R _b12, and passes through the ... F _b12 reflected mirror element D _b2, ... D _b12 It is reflected by the mirror E and converged and incident on the heat ray sensing element C. In FIG. 1, only the path of the heat ray from the detection areas R _{a4 and} R _b4 is shown.

By the way, in the instruction manual (not shown) of the heat ray detector A, the flat element F _{a1, on} the inner surface of the cover F is described _.
When a sheet-like material (masking label) that shields or absorbs heat rays is _attached to any of F _a12, F _b1, ... F _b12 , the overall detection area of the heat ray detector A has any shape. Is explained.

A plurality of masking labels G _{a and} G _b as shown in FIG. 4 are attached to the heat ray detector A, respectively. The masking labels G _{a and} G _b are adhesives that can be easily attached and detached to the cover F on one side of the heat ray shielding sheet, and are attached to the mount G that is easy to attach and detach. Has been done. Incidentally, the masking labels G _a plan containing F _a1, ... in the same size and shape as the respective F _a12, masking labels G _b are the same size and shape as the respective planes containing F _b1, ... F _b12.

Therefore, the operator who installs the heat ray type detector A is looking at the heat ray type detector A while looking at the above-mentioned instruction manual.
So that the entire detection area of is suitable for the site, that is, the heat rays contained in the headlights of automobiles radiate from the window or the heat rays from the heating equipment in the vicinity, In order to invalidate (disagree) the detection area in the direction that may be false alarm depending on the presence or absence of an intruder or the presence or absence of fire, which should be detected, the plane elements F _a1, ... F _a12,
It is determined which of F _b1, ... F _b12 the masking label G _a or the masking label G _b should be attached to, and the plane element to which the masking label is attached is determined.

Then, the operator installing the heat ray detector A puts the cover F removed from the main body base B on hand, peels off the necessary masking labels G _{a and} G _b from the mount G, and removes the cover F. The masking labels G _{a and} G _b are attached to the plane element to which the masking label is to be attached. At this time, the plane elements F _a1, ... F _a12, F _b1, ... F _b12 are in _contact with each other discontinuously between the plane and the plane and the plane and the curved surface, so that the plane elements F _a1, ... _a12, F _b1, … F
Each contour of _b12 can be identified. That is, the contours in which the planes and the planes and the planes and the curved surfaces discontinuously contact each other form the marks of the area divisions.

The plane elements F _a1, ... F _a12, F _b1, ... F
_Although the respective positions of _b12 can be identified with reference to the positions of the above-mentioned three locking pieces F ₁ , in order to eliminate mistakes, for example, as shown in FIG. "1" to "12" near the plane element F _a1, ... F _a12
It is preferable to attach the surface number of No. and to keep the relation with the above-mentioned instruction manual. By doing so, the masking label can be attached exactly as desired without making a mistake in the area division of the plane elements F _a1, ... F _a12, F _b1, ... F _b12 .

After that, if the cover F to which the masking label is attached is attached to the main body base B, the heat ray detector A
Can have a desired detection area, and the original detection sensitivity is not impaired. That is, a masking label G is attached to a cover F which is detached from the main body base B and placed at hand.
_Since the entire detection area of the heat ray detector A can be adjusted by attaching _a or the masking label G _b , the upper reflecting mirror D at the time of attaching the masking label.
And the mirror surface of the lower reflecting mirror E is free from dirt and dirt, and the pressing force for attaching the masking label is not applied to the upper reflecting mirror D and the lower reflecting mirror E as in the conventional heat ray type detector. Since it is good, the heat ray convergence position does not change, and the heat ray from the detection region always converges and enters the heat ray sensing element C accurately.

The present invention is not limited to the above embodiment, and the heat ray converging means may be not only a reflecting mirror but also a lens. Further, the area partition that serves as a mark may not be a boundary due to discontinuity between surfaces, but may be a boundary drawn like a line drawing, and if the boundary is clear, the area partition The surface may be a curved surface instead of a flat surface.

[0025]

Since the heat ray detector according to the present invention is constructed as described above, in the invention according to claim 1, the detection area as a whole is accurately measured without impairing the original detection sensitivity. In the invention according to claim 2, there is an effect that it is possible to provide an excellent heat ray detector that can easily adjust the detection region as a whole to a desired state.

[Brief description of drawings]

FIG. 1 is a partially crushed side view showing a main part of an embodiment of a heat ray detector according to the present invention.

FIG. 2 is a partially crushed side view showing a cover of the heat ray detector.

FIG. 3 is a plan view showing a cover of the heat ray detector.

FIG. 4 is a plan view showing a masking label of the heat ray detector.

[Explanation of symbols]

A heat ray type detector B main body base C heat ray sensing element D heat ray convergence means E heat ray convergence means F cover Fan _an area section (where n is a natural number of 1, ... 12) F _bn area section (where n is 1, ... 12) Natural number) G _a Masking label G _b Masking label R _an detection area (where n is a natural number of 1 ... 12) R _bn detection area (where n is a natural number of 1 ... 12)

Claims (2)

[Claims] 1. A main body base, a heat ray sensing element attached to the main body base, and a heat ray attached to the main body base and converging heat rays radiated from a plurality of detection regions to the heat ray sensing element. In the heat ray type detector comprising a converging means and a heat ray permeable cover which is detachably attached to the main body base so that the direction is uniquely determined and which covers the heat ray sensing element and the heat ray converging means, A heat ray type detector characterized in that a region section serving as a mark corresponding to each of the detection regions is provided in the. 2. The heat ray type detector according to claim 1, wherein a masking label coated with an adhesive is attached to each heat ray shielding sheet having a size substantially corresponding to each area section.