JPH0639352Y2 - Snowfall detector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a snowfall detector having a novel structure.

[0002]

2. Description of the Related Art Heretofore, in this type, the following has been done. There are roughly two methods for detecting snowfall using infrared rays. One of them is a diffuse reflection method in which a light source that emits infrared rays is condensed by a lens and emitted to the air, and infrared rays reflected by snowflakes falling within the radiation range are detected. The other is to detect the shadow generated when a snowflake crosses infrared rays as it falls in a radiation space where one emits infrared rays and the other receives infrared rays between two opposite poles. System. Among them, the infrared diffuse reflection method has a relatively simple structure as compared with the infrared counter method, so that the manufacturing cost is low, and thus it is also used as an object detection or a snowfall detector.

[0003]

However, if the reflected light of a small object such as snowfall is to be detected, it is difficult to detect it unless the light source is strengthened. Therefore, by strengthening the infrared light source, it is possible to detect the reflected light of the snowflakes in a certain metric space, but at the same time, the infrared light reaches a considerable distance in the front space, so buildings and people entering this infrared radiation range However, there was a defect that the snowfall detector also lacked accuracy as it detected cars and the like.

The present application has been made in view of the above problems of the prior art, and an object of the present application is to provide the following. The present invention eliminates these drawbacks by combining the infrared diffusion method and the counter method, improves the performance of the snowfall detector, and greatly contributes to the operation switch of the road heating device in the snowy region. .

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention is as follows. That is, the case of the present application is supported in parallel with the housing 2A, the arm 2B extending from the side surface of the housing in the forward direction of the housing, and the front plate 2A1 of the housing through the arm 2B. The infrared panel provided on the right side portion of the front panel 2A1 is provided with the reflection panel 3 on the enclosure panel 2C of the frame 2 which is composed of the enclosure panel 2C and the enclosure panel 2C facing the enclosure 2A. The light emitting diode section 4 is composed of a lens window 4A and an infrared light emitting diode 4B provided inside the lens window, and the phototransistor section 5 for infrared reflection and reception provided on the left side portion of the front plate 2A1 is An infrared filter 5A, a condenser holder 5B provided inside the infrared filter, and a condenser lens 5C provided in the condenser holder close to the infrared filter, It is composed of a phototransistor 5D for infrared reflection and reception provided at the bottom of the optical holder, and the reflected infrared light 11 is converted into a voltage proportional to its strength by the condenser holder 2, guided to an electronic circuit, and taken out as a signal. It is a snowfall detector configured to. In this case, the infrared light emitting diode 4B to the lens window 4A
The infrared ray 6 having a wavelength of 700 nm to 940 nm can be emitted into the air.

[0006]

EXAMPLES Examples will be described with reference to the drawings. 1 is a snowfall detector of the present invention. Reference numeral 2 denotes a frame, which is supported in parallel with the housing 2A, an arm 2B extending from the side surface of the housing in the forward direction of the housing, and the front plate 2A1 of the housing through this arm. It is composed of an enclosure panel 2C. Reference numeral 3 is a reflection panel stretched on the surface of the enclosure panel 2C that faces the housing 2A.

Reference numeral 4 denotes an infrared light emitting diode portion provided on the right side portion of the front plate 2A1, which comprises a lens window 4A and an infrared light emitting diode 4B provided inside the lens window. Reference numeral 5 denotes a phototransistor portion for infrared reflection and reception, which is provided on the left side of the front plate 2A1, and includes an infrared filter 5A, a condenser holder 5B provided inside the infrared filter, and an infrared ray inside the condenser holder. Condensing lens 5C provided close to the filter
And a phototransistor 5D for infrared reflection and reception, which is provided on the bottom of the condenser holder.

In this case, the infrared light emitting diode 4 of FIG.
From B to 700 nm through 940n through the lens window 4A
It is configured to emit infrared rays 6 having a wavelength of m into the air. The radiated infrared rays 6 are reflected by the reflection panel 3 in front of the radiated rays, become reflected infrared rays 7, pass through the infrared filter 5A, and are collected by the condenser lens 5C.

The reflected infrared ray 7 is converted into a voltage proportional to its strength by the condenser holder 5B, guided to an electronic circuit, and taken out as a signal.

The operation will be described together with the effect.

[0011]

Since the present invention is constructed as described above, it has the following effects. One of the features of this invention is to provide a distance space X which is obtained by the light source of the radiated infrared ray 6 and the reflection panel 3. The distance X and the space size are determined by the angle of the optical axis of the infrared ray 6 radiated and the reflection panel 9. The distance X is about 30
cm or less was suitable.

Now, when the snowflakes passing while falling in this space area are reflected by the infrared rays 6 or the reflection panel 3 and the optical axis of the reflected infrared rays 7 is blocked, the phototransistor 5D for infrared reflection and reception is provided. It is to utilize the change phenomenon of the intensity of infrared rays. Two of the features are
The emitted infrared rays 6 are not extended forward of the reflection panel 3. The radiated infrared ray 6 is not extended in front of the reflection panel 3. The environment in which the snowfall detector is installed and the installation location will not be restricted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view.

FIG. 2 is a perspective view.

[Explanation of symbols]

 1 Snowfall Detector 2 Frame 2A Case 2B Arm 2C Enclosure Panel 3 Reflection Panel 4 Infrared Light Emitting Diode Part 4A Lens Window 4B Infrared Light Emitting Diode 5 Phototransistor Part for Infrared Reflecting and Receiving 5A Infrared Filter 5B Condensing Holder 5C Condensing Lens 5D Phototransistor for infrared reflection and reception 6 Infrared 7 Reflected infrared

Claims (2)

[Scope of utility model registration request] 1. A frame (2) comprising a housing (2A) and an enclosure panel (2C) supported in front of the housing in parallel with the front plate (2A1) of the housing. In the enclosure panel (2C), the reflection panel 3 is stretched on the surface of the enclosure panel facing the housing (2A), and the infrared light emitting diode section (4) provided in the right part of the front plate (2A1). Is composed of a lens window (4A) and an infrared light emitting diode (4B) provided inside the lens window, and a phototransistor portion for infrared reflection and reception is provided at the left part of the front plate (2A1). (5) is an infrared filter (5A), a condenser holder (5B) provided inside the infrared filter, and a condenser lens (5C) provided close to the infrared filter in the condenser holder. , Focusing holder And a phototransistor (5D) for infrared reflection and reception at the bottom of the mirror, the reflected infrared (11) is converted into a voltage proportional to its strength by the condenser holder (2) and guided to an electronic circuit. , A snowfall detector characterized in that it is configured to be taken out as a signal. 2. A snowfall detector according to claim 1, which is arranged to emit infrared light (6) having a wavelength of 700 nm to 940 nm from the infrared light emitting diode (4B) through the lens window (4A) into the air. .