JPS5930426Y2 - light sensor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the structure of a light sensor and the attachment of a reflector mounted on the front surface of the special box.

Conventionally, in light sensors such as photoelectric fire detectors that detect light emitted from flames and issue alarms,
In order to block undesired light such as light incident from a tunnel entrance or an emergency light, a vertical light shield is provided on the undesired side of the light receiver.

Such a conventional light shielding body is made by bending a metal plate into an L-shape, and consists of a vertical light shielding part and a plate-shaped mounting part that supports the light shielding part and attaches it to the front panel of the sensor. For installation, a plurality of through holes are provided for screws, and these holes are used to fasten the sensor to the front plate of the sensor, which is a light shielding body.

In such conventional photodetectors, it is troublesome to attach the light shield, and the screw holes for the screws are unsightly, especially when used without the light shield.

Further, it was not possible to freely change the direction of the light shielding portion of the light shielding body in a desired direction.

The present invention was made in order to eliminate the drawbacks of the prior art.The two mounting holes are arranged in parallel on the front panel, and the first mounting hole is installed in the center of the plate-like mounting of the light shielding body. The second mounting has a fixing hole corresponding to the hole, and the second mounting has a pair of locking parts corresponding to the hole at symmetrical positions with respect to the fixing hole. The front plate and the mounting section are integrally connected by the light receiver mounted through the hole, and the second mounting is engaged with the desired locking section by the test light emitting device mounted through the hole. The light shielding direction of the light shielding body can be changed by stopping the light shielding body, and the light shielding body is not unsightly unless the light shielding body is attached.

Hereinafter, details of the present invention will be explained with reference to illustrated embodiments.

The figure shows a photoelectric fire detector to which the present invention is applied.

In the figure, 1 is a box-shaped main body with built-in emergency power supply, detection circuit, alarm, etc., 2 is a front plate that closes off the front of this main body 1, and 3 is attached to this front plate 2 to prevent unwanted light from entering. 4 is a light receiver that is attached to the front plate 2 to couple the light shield 3 to the front plate 2; 5 is attached to the front plate 2 and emits test light to the light receiver 4; It is also a test light emitter that prevents the light shielding body 3 from rotating when attached.

As shown in FIGS. 2 and 3, the front plate 2 has two mounting holes 6a having the same dimensions in the center.
, 6b are arranged side by side, and their peripheries are fixed to the main body 1 with screws or the like.

The light shielding body 3 is formed by bending and molding a metal plate, and includes a vertical light shielding part 3a and a plate-like mounting that is connected to the light shielding part 3a and is layered in close contact with the front surface of the front plate 2. 3b, and the light shielding portion 3a has a size sufficient to completely shield the light receiver 4 from unwanted light.

The mounting portion 3b has a rectangular shape, and a fixing hole 7 is formed in the center of the mounting portion 3b, which also serves as a circular through hole having the same dimensions as the first mounting hole 6a. When the fixing holes 7 are coaxially aligned with hole 6aK, the one on one side is attached to the second hole 6b, and when the light shielding body 3 is rotated 180 degrees, the one on the other side is attached as above. The second attachment is done by forming locking portions 8, 8 which are circular arc notches at symmetrical positions on both side edges of the portion 3b so as to coaxially overlap the hole 6b.

The light receiver 4 and the light emitter 5 differ in that one has a built-in photoelectric conversion element 9 and the other has a built-in test light source 10, and other parts have almost the same shape and the same dimensions, so they are compatible. has.

That is, both 4 and 5 are mounted through the holes 6at6.
bK A cylindrical body 11, 1 with an open end having an outer diameter that fits loosely
Screws 12, 12 are carved on the outer peripheral surface of 1, and a collar 1 is attached to the proximal edge to engage with the inner periphery of holes 6a, 6b.
3 and 13 to accommodate the photoelectric conversion element 9 or light source 10, and the front side is closed with front glasses 14 and 14. Which of the light receiver 4 and the light emitter 5 is attached to the hole 6at6b? It can be installed even if it is installed.

To assemble this fire detector, first, the plate-shaped mounting portion 3b of the light shielding member 3 is superimposed on the front plate 2, and the fixing hole 7 is coaxially superimposed on the first mounting hole 6a.

Then, the cylindrical body 11 of the light receiver 4 is inserted into both holes 6a and 7GC from the back side of the front plate 2, and the fixing nut 15 is screwed in from the front end to temporarily fix it.

Next, the direction of the light shielding body 3 is corrected so that the locking portion 8 and the second mounting hole 6b are coaxial.

Then, the cylindrical body 11 of the light emitter 5 is inserted into the second mounting hole 6bK from the back side of the front plate 2, and the fixing nut 15 is inserted from the front end.
By screwing in, the cylindrical body 11 is fixed in the mounting hole 6b, and the locking part 8 is engaged with the bolt 15.

Next, tighten the nut 15 of the light receiver 4 to fix the light receiver 4.

Next, a front glass 14°1 is attached to the light receiver 4 and the light emitter 5.
4 and the required wiring, the front plate 2 is attached to the main body 1.

In this example, the fixing hole 7 is located at the center of the plate-like mounting portion 3b, and the locking portion 8 is symmetrically formed on both sides of the mounting portion 3b, so that the light shielding body 3 is fixed at 180 degrees. It can be installed by rotating, and in this case as well, the shielding direction is simply reversed and the shielding angle remains unchanged.

Note that the disassembly can be done in the reverse order.

This J:5K fire detector has light shielding body 3 installed in section 3.
When the light receiver 4 is attached to the two front plates of B, the light shielding body 3 is automatically fixed to the front plate 2, and the light shielding body 3 is moved in the desired direction by the test light emitter 5 attached to the front plate. It is locked.

Therefore, since special fixing devices such as screws are not required, assembly and disassembly are easy.Furthermore, since there are no screw holes in the front plate 2, the light shield 3 can be removed when the light shield is not required. It's not unsightly though.

Furthermore, in this fire detector, the light shielding direction can be reversed by 180 degrees while the main body 1 remains attached, and in this case, the shielding angle remains unchanged.

Furthermore, since the attachment portion 3b is locked by the light emitter 5, the light shielding body 3 will not rotate undesirably.

In the above-described embodiment, the locking portion 5 is a notch, but the effect remains the same even if the locking portion 5 is a hole.

In addition, in the present invention, the cylindrical body may be threaded on its outer surface over its entire length, and a pair of fixing nuts may be screwed in from both ends to fix it to the front plate. A plurality of pairs of locking protrusions are provided on the same circumference, and the front plate is attached by providing a plurality of notches through which the locking protrusions pass, corresponding to the periphery of the hole and the fixing hole of the plate-like body. Furthermore, by providing a plurality of tapers along the circumferential direction on the residual protrusion created by forming this notch, the residual depth can be removed by inserting the cylindrical body into the hole and rotating it. The portion may be press-fitted between the locking protrusions and fixed.

Further, the present invention is not limited to the photoelectric fire detector described above, but can be applied to all types of photodetectors and has similar effects.

As described above, the photodetector of the present invention has a front plate having two mounting holes, and a front plate layered on the front surface of this front plate, and a first mounting hole in the center of the front plate. A plate-like mounting is provided with a hole and a pair of locking parts corresponding to the holes in the second mounting at symmetrical positions with respect to the fixing hole. The front plate and the mounting are attached by passing through the hole and the fixing hole, and the front plate and the mounting are integrally tightened to connect the light receiver, and the second mounting is attached through the hole and form a pair. Since a test light emitter that engages with one of the locking parts is provided, the light receiver has a coupling tool that connects the front plate and the mounting part, and the light emitter has a locking tool that locks the light shield in the desired direction. Each component can be used as a fixture, the number of parts is small, it is easy to disassemble and assemble, the light shielding direction of the light shield can be changed while the main body is attached, and there is no need for special fixing devices such as screws. If the light shielding body is not required, it will not be unsightly even if it is removed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the photodetector of the present invention, FIG. 2 is a front view of the same main part, and FIG. 3 is a sectional view taken along line 2 in FIG. 2. 2...Front plate, 3...Shiyako body, 3a
・・・・・・Front part, 3b・・・・・・Installation is part, 4
...... Light receiver, 5... Light emitter, 6 a,
6 b...Mounting hole, 7...Fixing hole,
8... Engagement part.

Claims (4)

[Scope of utility model registration request] (1) The two mounting holes are stacked on the front panel, which is formed by drilling holes side by side, and the front surface of this front panel, and the first mounting hole has a fixing hole corresponding to the hole in the center, and this fixing hole is stacked on the front panel. The second mounting has a plate-shaped mounting provided with a pair of locking parts corresponding to the holes at symmetrical positions with the hole as the center; A light receiver is mounted through the fixing hole, and the front plate and the mounting section are integrally tightened together, and the second mounting is mounted through the hole, and the paired engagement A light sensor comprising: a test light emitting device that engages with one of the stop portions; (2) The photoreceiver is made of a cylindrical body with a built-in photoelectric conversion element, and a screw is carved into the outer circumferential surface of the cylindrical body, and the screw is screwed in from both ends. 2. The photodetector according to claim 1, wherein the photodetector is clamped and bonded in a stacked state. (3) In the light receiver, a locking protrusion is integrally formed on a part of the outer peripheral surface of a cylindrical body containing a photoelectric conversion element, and corresponds to the protrusion. c5 A screw is carved in another part of the outer circumferential surface of the cylindrical body, and the front plate and the plate-like mounting part are connected by pressing the front plate and the plate-like mounting part in an overlapping state between the nut into which the screw is screwed and the above protrusion. The photodetector according to claim 1, characterized in that: (4) The light receiver is made up of a plurality of pairs of locking protrusions arranged on the same circumference in the axial direction on the outer peripheral surface of a cylindrical body containing a photoelectric conversion element, and the front plate is attached around the hole. In the case of a corresponding plate-like mounting, a notch is provided around the fixing hole of the part through which the locking protrusion passes, and in addition, in the above-mentioned mounting, at least one of the remaining protrusion around the hole and the fixing hole is tapered. Alternatively, the remaining protrusion is press-fitted into the gap between the locking protrusions by tapering the opposing surface of the locking protrusion and rotating the cylindrical body. A photodetector according to claim 1 of the patent registration claim.