JP2006221076A - Antifog glass device and monitor camera with antifog glass device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antifog glass device in which deterioration in the device itself and peripheral components (such as rubber packing and wiper rubber) is prevented by suppressing heating value when the ambient temperature is high. <P>SOLUTION: The antifog glass device 1 is provided with: a light transmitting body 4a of transmitting light from a subject; an electrically conductive heat generating part 4b formed on the surface of the light transmitting body 4a; a thermostat 4c connected to the electrically conductive heat generating part 4b in series; and a resistor 4d connected to the thermostat 4c in parallel. In accordance with the ambient temperature, the opening-closing state of the thermostat 4c is changed over, and the heating value in the electrically conductive heat generating part 4b is changed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-fogging glass device and a monitoring camera device with an anti-fogging glass device, and more particularly to an anti-fogging glass device having a snow melting function.

  A conventional anti-fog glass device in a surveillance camera device controls heating / non-heating by energizing / de-energizing the anti-fog glass device based on signals from a temperature sensor and a humidity sensor arranged in the camera case. (For example, refer to Patent Document 1). Moreover, the conventional heat generating apparatus controls the increase / decrease in the emitted-heat amount by connecting resistance in parallel (for example, refer patent document 2).

Japanese Patent Laid-Open No. 7-102349 Japanese Patent Laid-Open No. 11-257756

  Since the conventional anti-fogging glass device is configured as described above, there is a problem in that the amount of heat generated cannot be controlled. Specifically, when the heat generation amount of the anti-fogging glass device is set low, the ability to remove mist such as water vapor is sufficient, but it is insufficient to melt snow and ice attached to the glass. As a result, there is a problem that snow and ice adhere to the glass during snowfall, and monitoring by the camera device becomes impossible.

  On the other hand, when the heat generation amount of the defogging glass device is set high, the defogging ability and the snow melting ability are sufficient. However, when the ambient temperature becomes high as in summer use, the temperature of the anti-fog glass device tends to rise excessively until the temperature sensor senses the high temperature and the power supply voltage is cut off. It was. As a result, there has been a problem that the anti-fogging glass device and peripheral parts (rubber packing, wiper bar, etc.) are likely to deteriorate due to overheating.

  In addition, when the heat generation amount of the anti-fog glass device is set high and the set temperature of the temperature sensor is lowered, an excessive temperature rise of the anti-fog glass device can be suppressed, so that the glass device and peripheral parts (rubber packing, It was possible to prevent the deterioration of the wiper bar. However, since the power supply voltage is cut off in a state where the ambient temperature is low, there is a problem that fogging is likely to occur.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an anti-fogging glass device capable of sufficiently removing defrosting of glass and melting snow of attached snow and ice. Another object of the present invention is to provide an anti-fogging glass device capable of preventing deterioration of an anti-fogging glass device and peripheral parts (rubber packing, wiper bar, etc.) by suppressing the amount of heat generated when the ambient temperature is high.

  An anti-fogging glass device according to the present invention includes a translucent body that transmits light from a subject, a conductive heating portion formed on the surface of the transparent body, a thermostud connected in series to the conductive heating portion, and a thermostud And a resistor connected in parallel. The open / close state of the thermostud is switched according to the ambient temperature, and the heat generation amount of the conductive heat generating portion changes.

According to the present invention, the heat generation amount of the anti-fogging glass device can be switched between a high heat generation amount and a low heat generation amount according to the set temperature of the thermostud, so that it is possible to provide a heat generation amount according to the ambient temperature. is there.
Further, the anti-fogging glass device of the present invention is intended only to prevent fogging at a temperature higher than the set temperature of the thermostud, so that it always generates heat with a low calorific value. Also, it generates heat with a high calorific value only when snow melting or the like is necessary. Therefore, the set temperature of the thermostud can be set low, and the maximum temperature reached by the antifogging glass device itself can be lowered as compared with the conventional antifogging glass device. As a result, there is an effect of preventing thermal deterioration of the anti-fogging glass device and peripheral parts (rubber packing, wiper bar, etc.).
Furthermore, since it is the structure which only added resistance with respect to the conventional structure, there exists an effect that a fog prevention glass apparatus can be implement | achieved cheaply.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below. FIG. 1 is a detailed view showing the configuration of the surveillance camera device according to Embodiment 1, FIG. 1 (A) shows a front view, and FIG. 1 (B) shows a cross-sectional view of FIG. 1 (A). Yes. In FIG. 1, a monitoring camera device 1 is provided with a camera 3 that images and monitors a subject (not shown) inside a camera case 2 serving as a housing, and faces a lens 3 a of the camera 3. At the position, that is, at the opening of the camera case 2, a translucent body 4 a of the anti-fogging glass device 4 is provided. The translucent body 4a is made of, for example, glass or the like that transmits an optical signal from a subject. The anti-fog glass device 4 includes a conductive heating part 4b formed on the surface of the light transmitting body 4a, a thermostud 4c connected in series to the conductive heating part 4b, and a resistor connected in parallel to the thermostud 4c. 4d.

  Further, a rubber packing 5 having a waterproof function is disposed between the camera case 2 and the translucent body 4a so as to fill a gap therebetween. Further, with respect to the wiper unit 6, a movable portion 4 b that draws an arc trajectory with respect to the surface of the translucent body 4 a is disposed outside the camera case 2, and the movable portion 4 b is rotated inside the camera case 2. A motor 4c is arranged. One end of the movable portion 4b is fixed to the motor 4c, and a wiper bar 6a is attached to the other end so as to come into contact with the surface of the translucent body 4a. The wiper bar 6a slides on the sliding surface 4e on the surface of the translucent body 4a shown in FIG.

  Next, the operation of the anti-fogging glass device 4 when the ambient temperature is lowered will be described. FIG. 2 is a circuit diagram of the anti-fogging glass device according to the first embodiment. In FIG. 2, the set temperature of the thermostud 4c is set higher than 0 degreeC. For example, a case where the thermo stud 4c is set to be in a “closed” state at 5 ° C. and an “open” state at 15 ° C. will be described below.

  When the ambient temperature is 15 ° C. or higher, the thermostud 4c is in the “open” state, and the conductive heat generating portion 4b and the resistor 4d are in series connection. Therefore, the power supply voltage is applied to the conductive heat generating portion 4b and the resistor 4d, and the conductive heat generating portion 4b generates heat with a low heat generation amount to prevent the light transmissive body 4a from being fogged, and to prevent the fogging glass device 4 and peripheral components (rubber packing). 5, the thermal degradation of the wiper bar 6a and the like).

  On the other hand, when the ambient temperature is 5 ° C. or less as during snowfall, the thermostat 4c is in a “closed” state, and the power supply voltage is directly applied to the conductive heat generating portion 4b. Get. As a result, even if snow and ice adhere to the transparent body 4a due to snowfall, it can be sufficiently melted.

  As described above, according to the first embodiment, by adding the resistor 4d, the anti-fog glass device 4 can be operated with a low heat generation amount, and an appropriate heat generation amount according to the ambient temperature can be obtained. Increase or decrease is possible. In addition, it is possible to control the increase or decrease in the amount of heat generation with an inexpensive configuration. Furthermore, the maximum temperature reached by the anti-fogging glass device 4 can be lowered, and there is an effect of preventing thermal deterioration of the anti-fogging glass device 4 and peripheral components (rubber packing 5, wiper bar 6a, etc.).

It is detail drawing of the surveillance camera apparatus which concerns on Embodiment 1 of this invention. It is a circuit diagram of the anti-fog glass apparatus concerning Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surveillance camera apparatus, 2 Camera case, 3 Camera, 3a lens, 4 Anti-fog glass apparatus, 4a Translucent body, 4b Conductive heat generating part, 4c Thermo stud, 4d Resistance, 4e Sliding surface, 5 Rubber packing, 6 Wiper unit, 6a Wiper bar, 6b movable part, 6c motor.

Claims (3)

A translucent body that transmits light from the subject;
A conductive heat generating part formed on the surface of the transparent body;
A thermostud connected in series to the conductive heat generating part;
A defogging glass device comprising: a resistor connected in parallel to the thermo stud.   When the ambient temperature is equal to or higher than a set temperature of the thermostud, the thermostud is opened, a power supply voltage is applied to the conductive heat generating part and the resistor, and a heat generation amount of the conductive heat generating part is reduced. The anti-fog glass apparatus according to 1. A camera housed in a housing and imaging a subject;
A defogging glass device according to claim 1 or 2,
A surveillance camera device, wherein the light transmitting body is disposed at a position facing a lens of the camera.

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