JPH0633092U - Snowfall detector - Google Patents

Abstract

(57) [Summary] [Object] The present invention improves the performance of a snowfall detector by combining an infrared diffusion method and a counter method, and can contribute as an operation switch of a load heating device in a snowy cold region. Is. [Structure] Case 2A and front plate 2A1 of the case in front
On the enclosure panel 2C of the frame 2 composed of the enclosure panel 2C supported in a state parallel to the front panel 2A1, the reflection panel 3 is stretched on the surface of the enclosure panel facing the enclosure 2A. The infrared light emitting diode portion 4 is provided in the one portion, and the phototransistor portion 5 for infrared reflection and reception is provided in the left portion of the front plate 2A1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a snowfall detector having a novel structure.

[0002]

[Prior art]

 Conventionally, this kind of thing is as follows. 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 collected by a lens, radiated in the air, and reflected infrared rays are reflected by snowflakes falling within the radiation range. The other is to detect the shadow generated when a snowflake crosses infrared rays as it falls in the radiation space where one emits infrared rays and the other receives infrared rays between the two opposite poles. It is a counter method. Among them, the infrared diffuse reflection method is also used as an object detection or snowfall detector because the structure is relatively simple compared to the infrared countermeasure method and the manufacturing cost is low.

[0003]

[Problems to be solved by the device]

 However, it is difficult to detect the reflected light of a small object such as snowfall unless the light source is strengthened. Therefore, by strengthening the infrared light source, the reflected light of snowflakes can be detected 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, it also detected cars, etc., and had the drawback of not being accurate as a snowfall detector.

The present application has been made in view of such problems of the conventional technique, and an object of the present application is to provide the following things. 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 snowy regions. is there.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is as follows. That is, in the case of the present application, the housing 2A, the arm 2B extending from the side surface of the housing in the front direction of the housing, and the front plate 2A1 of the housing through the arm 2B are supported in parallel with each other. On the enclosure panel 2C of the frame 2 composed of the enclosed enclosure panel 2C, the reflection panel 3 is stretched on the surface facing the enclosure 2A of the enclosure panel, and provided on the right side portion of the front plate 2A1. The infrared light emitting diode section 4 is composed of a lens window 4A and an infrared light emitting diode 4B provided inside the lens window. The infrared light emitting diode section 4 is provided on the left side of the front plate 2A1 for infrared reflection and reception. The transistor unit 5 includes an infrared filter 5A, a condenser holder 5B provided inside the infrared filter, and a condenser lens 5 provided close to the infrared filter in the condenser holder. And a phototransistor 5D for infrared reflection / reception provided at the bottom of the condenser holder. The reflected infrared rays 11 are converted by the condenser holder 2 into a voltage proportional to its intensity, and guided to an electronic circuit. It is a snowfall detector configured to be taken out as a signal. In this case, the infrared light emitting diode 4B can be configured to pass through the lens window 4A and radiate the infrared light 6 having a wavelength of 700 nm to 940 nm into the air.

[0006]

【Example】

 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 an enclosure 2A, an arm 2B extending from a side surface of the enclosure in the forward direction of the enclosure, and a front plate 2A1 of the enclosure via this arm. And an enclosure panel 2C. Reference numeral 3 is a reflection panel stretched on the surface of the enclosure panel 2C which 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 is composed of a lens window 4A and an infrared light emitting diode 4B provided inside the lens window. Reference numeral 5 denotes a phototransistor section for infrared reflection and reception provided on the left side of the front plate 2A1, which includes an infrared filter 5A, a condenser holder 5B provided inside the infrared filter, and a condenser holder inside the condenser. It is composed of a condenser lens 5C provided close to the infrared filter and a phototransistor 5D provided at the bottom of the condenser holder for infrared reflection and reception.

In this case, the infrared light emitting diode 4B of FIG. 1 is configured to pass through the lens window 4A and radiate the infrared light 6 having a wavelength of 700 nm to 940 nm 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 configured to be 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]

[Effect of device]

 Since the present invention is configured 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 size of the space are determined by the angle of the optical axis of the infrared ray 6 radiated and the reflection panel 9. The distance X is preferably about 30 cm or less.

[0012] Now, when blocking the optical axis of infrared rays 6 or the reflection panel 7 which is reflected by the infrared rays 6 or the reflection panel 3 from which snowflakes passing while falling in this space area are radiated, a phototransistor 5D for infrared reflection and reception is used It is to utilize the change phenomenon of the intensity of infrared rays. Two of the characteristics are that the radiated infrared rays 6 are not extended in front 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. .