JP2540192Y2 - Ray type detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention outputs a light beam to a monitoring area, receives the light beam directly or by reflecting it on a reflector, and detects smoke generated by a fire due to a change in the amount of received light or interruption caused by intrusion. The present invention relates to a light beam sensor for sensing.

[0002]

2. Description of the Related Art Conventionally, as this type of light beam type sensor,
For example, a dimming type separated smoke detector disclosed in Japanese Utility Model Laid-Open No. 57-81547 is known. As shown in FIG. 11, the dimming type separated smoke detector includes a storage case 1 for storing the light transmitting unit 2 or the light receiving unit 3. Light transmitter 2
Is configured to include a light emitting element 4 and a lens 5 for converting the light from the light emitting element 4 into a beam, while the light receiving unit 3 includes a lens 6 for condensing the light transmitted from the light transmitting unit 2. And a light receiving element 7 for detecting the light collected by the lens 6.
In addition, a lotus root-shaped column 9 having many long holes 8 is provided on the front surfaces of the lenses 5 and 6.

In the sensor, a light beam is output from the light transmitting unit 2 toward the monitoring area, and the light beam is output to the light receiving unit 3.
To detect smoke generated by a fire due to a change in the amount of received light. In addition, when the sensor is under an environmental condition in which dew condensation occurs, dew is condensed on the inner walls of the long holes 8 formed in the lotus root-shaped column 9 as much as possible. So as to prevent light dimming other than by smoke.

[0004]

However, in the above-described conventional light beam type detector, since the lotus root-shaped column 9 is opaque, the transmitted and received light beams are diminished accordingly, and the light beam is reduced. However, there is a problem that the light emission output must be increased.

[0005] The present invention has been made in view of the above-mentioned problems, and improves the efficiency of passing light rays during normal times.
It is an object of the present invention to make it difficult to reduce light even under environmental conditions in which dew condensation occurs.

[0006]

Means of the present invention for solving the above problems are a storage case for storing at least one of a light transmitting unit and a light receiving unit, and a light transmitting unit provided in the storage case. And a window through which light transmitted from the light source and reaching the light receiving unit passes. The window is formed of a translucent material, and the window is formed of a plurality of grooves in the longitudinal direction. The location is formed.

In the invention of claim 2, the window is provided in a hood connected to the case, and a plurality of ventilation holes are provided in the hood.

Further, in the invention of claim 3, a storage case for storing at least one of the light transmitting unit and the light receiving unit, and the storage case is provided with the storage case and is sent from the light transmitting unit to reach the light receiving unit. In a light beam type sensor having a window through which light passes, the window is formed of a translucent material, and the window is formed with a recess formed of a large number of through holes, and A window is provided in a hood connected to the case, and a plurality of ventilation holes are provided in the hood.

[0009]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, a light sensor according to an embodiment of the present invention will be described. The light beam type detector according to the present embodiment is a dimming type separated type smoke detector for detecting smoke generated by a fire or the like.

In this embodiment, since the window is formed of a light-transmitting material, the efficiency of passing light rays in a normal state is improved. As a result, the dew condensation hardly occurs in the concave portion, and the light beam can surely pass through the concave portion, so that the light is hardly dimmed.

FIG. 1 is a perspective view showing a first embodiment of a dimming type smoke detector according to the present invention, and FIG. 2 is a sectional view thereof. The sensor according to the first embodiment, as described above,
A storage case 1 for storing the light transmitting unit 2 or the light receiving unit 3 is provided. The light transmitting unit 2 includes a light emitting element 4 and a lens 5 that converts the light from the light emitting element 4 into a beam, while the light receiving unit 3 condenses the light transmitted from the light transmitting unit 2. And a light receiving element 7 for detecting light collected by the lens 6.

The storage case 1 is provided with a window 10 through which light transmitted from the light transmitting unit 2 and reaching the light receiving unit 3 passes. This window 10, as shown in FIGS. 1 and 3,
It is formed of a translucent material such as an acrylic plate.
The filter has a filter function of transmitting light in the infrared region but blocking light of other wavelengths. The window 10 has a plurality of grooves 11 as recesses. Each groove 11
Extend vertically and are arranged at equal intervals.

The sensor according to the first embodiment is installed in a building facility having a wide monitoring area, such as a gymnasium. Normally, as shown in FIG. 2, a light beam is output from the light transmitting unit 2 toward the monitoring area, and the light beam is directly received by the light receiving unit 3, and a change in the amount of received light is sensed. In this state, since the window 10 is formed of a light-transmitting material, the light-passing efficiency is good, and therefore, it can function without increasing the light emission output much.

[0015] In addition, the environmental conditions under which dew condensation occurs, that is, dew condensation generally refers to a phenomenon in which when warm air comes into contact with a cold substance, the air is cooled and saturated water vapor adheres to the cold substance as dew. Under such conditions,
It looks like this: Since the window 10 is formed with the groove 11, as shown in FIG. 3 and FIG.
2 and thin portions 13 are formed alternately. The thick portion 12 has a slower adaptation of heat, and the thin portion 13 has a faster heat adaptation. Therefore, dew condensation easily occurs in the thick portion 12 and dew condensation hardly occurs in the thin portion 13. That is, as shown in FIG. 4, the protruding portion A, the wall portion B of the groove 11, and the bottom portion C of the groove 11
Dew condensation will occur in this order. Therefore, the groove 11
As shown in FIG. 5, almost no fogging due to dew condensation occurs at the bottom portion C, so that it becomes difficult to reduce the light amount, and light transmission is secured. Therefore, erroneous detection due to dew condensation is prevented. Also, even if dew condensation occurs on the protruding portion A,
Not all the light beams are blocked, and transmission of the light beams from the protruding portion A is ensured to some extent.

Further, even if the condensation progresses and water droplets adhere to the entire groove 11, the water droplets are easy to flow from top to bottom because the groove 11 is formed to extend up and down, so that the water droplet is removed. Therefore, also at this point, the dimming due to dew condensation is suppressed.

Further, when smoke is generated due to a fire and enters the monitoring area on the optical axis from the light transmitting unit 2 to the light receiving unit 3, the light receiving input of the light receiving unit 3 is reduced to a level below a certain level. Then, this is sensed and, for example, a fire signal is output.

FIG. 6 shows a dimmable separated smoke detector according to a second embodiment of the present invention. The window 20 of the sensor according to the second embodiment is also formed of a light-transmitting material such as an acrylic plate as described above. The window 20 has a large number of small holes 21 penetrating therethrough as recesses.

[0019] Therefore, according to the sensitive knowledge unit according to this second embodiment, in the environmental conditions arising condensation, as follows. Since the pores 21 are formed in the window 20, the contact efficiency of the air is good, and therefore, the heat exchange is performed efficiently. As a result, as shown in FIG.
The dew condensation around 23 is suppressed. For this reason, the light beam passes through the small hole 21 and also passes through the periphery 23 of the small hole 21, so that the transmission of the light beam is ensured accordingly.

The pores, as shown in FIG.
4 may be formed.

FIGS. 9 and 10 show a third embodiment of the present invention. The window of the sensor according to the third embodiment is formed similarly to the window 10 according to the first embodiment or the window 20 according to the second embodiment (the window 10 is shown in the drawing). The window 10 is provided in a hood 30 continuous with the case, and the hood 30 is provided with a plurality of ventilation holes 31. The case 1 is provided with a translucent plate-shaped window 32.

[0022] Therefore, according to the sensitive knowledge apparatus according to the third embodiment, in the environmental conditions arising condensation, as follows. In the window 10, the transmission of light rays is ensured in the same manner as described above. On the other hand, air other than the air condensed on the hood 30, which is relatively unlikely to be saturated with water vapor, flows from the ventilation hole 31 of the hood 30. The temperature difference between inside and outside can be quickly reduced without causing dew condensation. As a result, dew condensation hardly occurs in the window 10 and transmission of light rays is secured.

In the above embodiment, the recess is formed by the groove 11.
However, the present invention is not limited to this, and it may be formed by a concave portion having another shape. In addition, the present invention is not limited to the dimming type smoke detector, and may be applied to various light beam type detectors.

[0024]

As described above, according to the light beam type detector of the present invention, since the window is formed of a translucent material,
It is possible to improve the transmission efficiency of the light in the normal, even under environmental conditions of occurrence of condensation, vertical-shaped multiple-start
Due to the formation of the recess consisting of the groove, water droplets adhere to the entire groove
In addition, there is an effect that water droplets easily flow downward along the vertical groove, and dew condensation hardly occurs in the recess. Therefore, the light can be surely transmitted through the recess and the light is hardly dimmed. Therefore, it is possible to cope with an environmental condition in which dew condensation occurs without increasing the light emission output. The sensor of the present invention
According to the above, under the environmental conditions where dew condensation occurs,
Other than air dew condensed on the hood through the ventilation holes of the provided hood
Air that is relatively unlikely to be saturated with water vapor flows in,
The temperature difference between the inside and outside without dew condensation inside the
Decreases quickly, which results in more condensation on windows
Is less likely to occur and light transmission is ensured.
There is.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a light beam type sensor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a light beam type sensor according to the first embodiment of the present invention;

FIG. 3 is a perspective view showing the window according to the first embodiment of the present invention;

FIG. 4 is a main view showing the operation of the window according to the first embodiment of the present invention.

FIG. 5 is an enlarged front view showing the operation of the window according to the first embodiment of the present invention.

FIG. 6 is a perspective view showing a light beam type sensor according to a second embodiment of the present invention.

FIG. 7 is an enlarged perspective view showing an operation of the window according to the second embodiment of the present invention.

FIG. 8 is an enlarged front view showing a modified example of the window according to the second embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a light beam type sensor according to a third embodiment of the present invention.

FIG. 10 is a sectional view showing the operation of the light beam type sensor according to the third embodiment of the present invention.

FIG. 11 is a cross-sectional view showing an example of a conventional light beam type sensor. DESCRIPTION OF SYMBOLS 1 Storage case 2 Light-sending part 3 Light-receiving part 10 Window 11 Groove (recess) 20 Window 21 Micropore (recess) 30 Hood 31 Ventilation hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mariko Ishida 2-10-43, Kami-Osaki, Shinagawa-ku, Tokyo Inside Hochiki Co., Ltd. 57-81547 (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 1. A light beam comprising: a storage case for storing at least one of a light transmitting unit and a light receiving unit; and a window provided in the storage case and through which light transmitted from the light transmitting unit and reaching the light receiving unit passes. A light beam type sensor according to claim 1, wherein said window is formed of a translucent material, and said window is formed with a recess formed by a plurality of grooves in a vertical direction. 2. The light beam type sensor according to claim 1, wherein the window is provided in a hood connected to the case, and a plurality of ventilation holes are provided in the hood. 3. A light beam comprising: a storage case for storing at least one of a light transmitting unit and a light receiving unit; and a window provided in the storage case and through which light transmitted from the light transmitting unit and reaching the light receiving unit passes. In the type sensor, the window is formed of a translucent material, the window is formed with a recess formed of a large number of through holes, and the window is provided in a hood connected to a case. A light beam type sensor, wherein a plurality of ventilation holes are provided in the hood.