JPH0697190B2 - Heat ray detector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat ray detector attached to a construction surface such as a wall surface to detect a human body or the like.

[Background Art] Conventionally, human body detectors based on ultrasonic, infrared, and radio wave types have been developed and commercialized. However, recently, heat ray detectors using far infrared rays do not interfere with each other and are three-dimensional. The heat ray detector as a human body detector has become the mainstream due to its vigilance and low power consumption.

However, many heat ray detectors use parabolic mirrors,
Since this kind of heat ray detector includes a fixed structure of parabolic mirror,
There is a problem that the shape becomes large and the structure becomes complicated.

So, recently, from the mirror method using a parabolic mirror,
Fresnel lens systems, which can simplify the structure and reduce the size, are often adopted. Fig. 10 shows a conventional Fresnel lens type heat ray detector. In this heat ray detector, a heat ray element 1 such as a pyroelectric element and a detection circuit for detecting a human body from the output of the heat ray element 1 are mounted on a printed circuit board 4, and a box in which the printed circuit board block 9 is opened at the front surface is mounted. The base 3'is screwed and stored in the base 3 ', and the cover 5'with the Fresnel lens 2 attached is attached to the opening of the base 3'at a position where the heat ray is focused on the heat ray element 1. It has a structure that The base 3'has a device mounting hole 8 so that it can be screwed to the wall surface with a wood screw 7.
Is perforated.

By the way, in this type of heat ray sensor, in order to set the detection area in a desired direction, when the heat ray sensor needs to be attached to the construction surface in the desired direction, a separate attachment member is required. There was a problem. In other words, conventionally, if the heat ray sensor itself is provided with a function for adjusting the detection direction,
Since the structure becomes complicated and the shape becomes large, and the features of the Fresnel lens type heat ray sensor for the purpose of downsizing are impaired, a separate mounting member is required.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a Fresnel lens-type heat ray sensor as a separate member without impairing the feature of miniaturization. It is to be able to set the detection region in a desired direction without using a certain mounting member.

Disclosure of the Invention (Embodiment) FIG. 1 to FIG. 9 show an embodiment of the present invention. The heat ray sensor of the present embodiment is designed to be downsized by using a Fresnel lens 2 as an optical system, and the case of this heat ray sensor is composed of a base 3, a body 10 and a cover 5, and a Fresnel lens. The lens 2 is attached to the body 10, the printed circuit board block 9 is housed inside and attached to the base 3, and the cover 5 is attached to the base 3 so as to cover the body 10.

As shown in FIG. 3, the body 10 is a box-shaped body having a back surface opened, and has a front surface opened at a portion to which a Fresnel lens 2 for condensing heat rays is attached to the heat ray element 1. A semi-circular protrusion 11 is projected from the upper and lower edges of the front opening.
The curved surface shape is matched with the curved surface of the Fresnel lens 2.
Then, for example, the width of both sides of the opening is formed to be slightly wider than the width of the Fresnel lens 2, and the lens retainer 12 is fitted to both side edges of the opening generated when the Fresnel lens 2 is fitted to the protrusion 11. As a result, the Fresnel lens 2 is attached to the body 10. As the Fresnel lens 2, in addition to the Fresnel lens 2 shown in the central portion of FIG. 3, a Fresnel lens 2 ′ having a different detection direction shown at the left end of the drawing can be used. In other words, the Fresnel lenses 2 and 2'can be replaced depending on the detection direction to arbitrarily set the detection area of the heat ray detector.

As shown in FIG. 1, the base 3 is composed of two pieces, that is, a second base 31 in which the printed circuit board block 9 is housed and a first base 32 mounted on a mounting surface such as a wall surface. Both bases 31 and 32 are box-shaped with their front faces opened, and the lower end edge of the rear face of the second base 31 and the lower end edge of the opening of the first base 32 are hinge-coupled to each other, with the hinge portion serving as a fulcrum. The upper parts of both bases 31 and 32 are open.

The printed circuit board block 9 is formed by mounting on the printed circuit board 4 a heat ray element 1 such as a pyroelectric element and circuit components constituting a detection circuit for detecting the human body from the output of the heat ray element 1.

As shown in FIG. 3, locking pieces 13 are provided on the back side of the body 10 from the upper and lower side surfaces, and a fitting portion 35 is formed on the inner surface of the second base 31 as shown in FIG. Formed and body 10
The claw 14 of the locking piece 13 is fitted into the fitting portion 35 of the second base 31, and the body 10 is fixed to the second base 31. And
By placing the printed circuit board block 9 in the second base 31 and fitting the body 10 to the second base 31,
It is fixed without screws. That is, in this embodiment, the printed circuit board block 9, the body 10 and the base 3 can be assembled together without screwing.

Now, when detecting a human body in front of a mounting surface such as a wall surface, the first base 31 and the second base 32 are to be detected.
And the detection direction of the heat ray element 1 may be set straight ahead of the mounting surface. When the detection direction is changed, the second base 31 is moved to the first position as shown in FIG.
It is possible to change the detection area by removing the fitting from the base 32 and inserting it.

Here, the inclination of the second base 31 at this time is kept constant by the leaf spring 34. In order to maintain the inclination of the second base 31 by the leaf spring 34, a recess 15 is formed on the upper surface of the body 10, and a plurality of engaging grooves 16 as uneven portions are formed on the bottom surface of the recess 15. Perforated in the front-back direction. An insertion hole (not shown) is formed in the back surface of the second base 31 so as to correspond to the recess 15 of the body 10.

The leaf spring 34 is substantially L-shaped, and its base end is fixed to the first base 32, and the forwardly bent front end is passed through the insertion hole of the second base 31 to position the recess 15 of the body 10. Then, a claw (not shown) as a fitting portion formed at the tip of the leaf spring 34 is locked in the engaging groove 16 to fix the inclination of the second base 31. That is, in this embodiment, the engaging groove 16 and the leaf spring 34 constitute a turning angle adjusting means for adjusting the turning angle of the second base 31 from the first base 32. In this case, since the printed circuit board block 9 is covered with the body 10, there is a risk that the circuit components mounted on the printed circuit board 4, particularly the heat ray element 1, may be touched when the angle is adjusted to cause a problem of changing the performance. There are no advantages.

When attaching the heat ray detector A to a construction surface or the like, first, the first base 32 is screwed to the construction surface. At this time, a screw is screwed into the leaf spring 34 to attach the first base 32 so as to be sandwiched between the leaf spring 34 and the construction surface. Then, the claw of the leaf spring 34 is fitted into the engagement groove 16 of the recess 15 of the body 10. In this state, the hinge portion that connects the bases 31 and 32 is opened, and the heat ray sensor A is oriented in an appropriate detection direction.

The outer surface of the first base 32 of this embodiment is a taper surface inclined at 45 degrees, so that the heat ray sensor A can be attached to the corner B of a room as shown in FIG. Has become.

Then, the cover 5 is fitted onto the body 10 to complete the assembly and construction. The cover 5 is a box type with a rear opening,
An opening 51 is formed in the front surface for inserting the Fresnel lens 2. By the way, a rib (not shown) is provided so as to project from the opening edge of the second base 31, and the outer shape of this rib is formed to be the same as the inner shape of the opening of the cover 5. The second base 31 and the cover 5 can be attached by press-fitting the portion into the opening of the second base 31. A tamper mechanism leaf spring 52 having a tamper function is attached to the back side of the front surface of the cover 5 in contact with two contact pins such as a terminal block mounted on the printed circuit board 4 and mounted on the printed circuit board 4. The operation display window 53 for transmitting the light of the operation display lamp (not shown) is provided, and a switch for sliding the leaf spring 54 left and right on the side of the operation display window 53 to turn the operation display lamp on and off. The operating portion 55 is provided, and the leaf spring 54 covers the operation display window 53 when the operating portion 55 is operated to the off side. An external view of the heat ray sensor assembled as described above after assembly is shown in FIG.

[Advantages of the Invention] As described above, the present invention includes a first base attached to a construction surface such as a wall surface and a front surface rotatably attached to the first base with one side edge pivotally attached. A box-shaped second base having an opening, a printed circuit board block in which a detection circuit for detecting a human body or the like is mounted from the heat ray element and the output of the heat ray element and housed in the second base, and this printed circuit board block A body that is fitted into the second base to fix the printed circuit board block in a state of being housed in the base;
A Fresnel lens attached to the front surface of the body for condensing the heat rays on the heat ray element of the printed circuit board block; and a cover provided with an opening for exposing the Fresnel lens and attached to the opening of the second base, Since the rotation angle adjusting means for adjusting the rotation angle of the second base from the first base is provided, it is possible to adjust the second angle according to the mounting position of the heat ray sensor.
A rotation angle for adjusting the rotation angle of the base and the detection direction in the vertical direction can be varied, and the rotation angle for adjusting the rotation angle of the two-piece base including the first and second bases A plurality of concave and convex portions that are arranged in the front-rear direction on the upper surface of the body and have one end fixed to the first base and the second base at the other end and are fitted into any of the concave and convex portions. Since the rotation angle adjusting means is constituted by the leaf spring having the fitting portion formed therein, the heat ray sensor itself can adjust the detection direction, and therefore the mounting member is used for setting the detection direction. The detection direction can be adjusted with a relatively simple structure without the need for a separate one, and therefore the feature of the Fresnel lens type heat ray sensor, which is the feature of miniaturization, can be maintained as it is. Outer shell body, base and hippo Fits inside, since the appearance change is small, there is an advantage that good visual quality.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing the appearance of the same after assembly, and FIG. 3 is an explanatory view showing how Fresnel lenses are attached to a body. The figure is a side view showing a state where the same is attached to a building, and FIG. 5 is an explanatory view showing a state where the same is arranged at a corner portion of the building,
FIG. 6 is a cross-sectional view showing the shape of the main part of the first base of the above, and FIG. 7 is an explanatory view showing a method of adjusting the mounting angle of the same.
FIG. 8 is a perspective view showing a mounted state of the same cover, FIG. 9 is a rear perspective view of the same cover, and FIG. 10 is an exploded perspective view showing a conventional example. 1 is a heat ray element, 2 is a Fresnel lens, 3 is a base, 4 is a printed circuit board, 5 is a cover, 9 is a printed circuit board block, 16 is an engaging groove, 31 is a second base, 32 is a first base, 34 Is a leaf spring.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Muneo Suzuki 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) References: 56-132686 (JP, U) JP, U) US Patent 4447726 (US, A)

Claims (1)

[Claims] 1. A box-shaped second base having a first base attached to a construction surface such as a wall surface, and a front side opening rotatably attached to the first base with one side edge pivotally attached. A base, a printed circuit board block in which a detection circuit for detecting a human body or the like from the heat ray element and the output of the heat ray element is mounted and is accommodated in the second base, and a state where the printed circuit board block is accommodated in the second base. 2 includes a body that is fitted inside the base to fix the printed circuit board block, a Fresnel lens that is attached to the front surface of the body and focuses heat rays on the heat ray element of the printed circuit board block, and an opening that exposes the Fresnel lens. A cover is provided which is drilled and attached to the opening of the second base, and rotation angle adjusting means for adjusting the rotation angle of the second base from the first base. A plurality shape ridge portions which are arrayed in direction,
The rotation angle adjusting means is configured by a leaf spring having one end fixed to the first base and the other end having a fitting portion formed to pass through the second base and fitted into one of the concave and convex portions. A heat ray detector characterized in that