JPH0856298A - Camera for supervision - Google Patents

Abstract

PURPOSE: To provide a camera for monitor which can exactly recognize the state of monitor object despite of the strength of beams emitted from the monitor object by controlling the level of voltage to be applied to a light attenuating member corresponding to the strength of beams sensed by photosensor. CONSTITUTION: When high output beams are emitted, the intensity of beams is sensed by a photosensor 41 and these beams are outputted with a prescribed voltage value. This voltage value is sent to an attenuation regulator 50. The attenuation regulator 50 regulates the voltage to be applied to speed glass 40 by correcting the output voltage value of photosensor 41. Based on the change of this voltage, the transmissivity of beams is regulated by rotating magnetic materials inside the speed glass 40. Thus, the intensity of beam which is received in a camera 10 is attenuated. Therefore, the camera 10 exactly recognizes the state of monitor object. Further, in operation, a photocell 42 converts beam energy to electric energy and stores it in a storage battery 60. The electric energy stored in the storage battery 60 is used as an operating power source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera installed in a work place where high-power light rays are emitted and used to monitor the work status, and in particular, it uses a special blocking glass capable of adjusting the amount of light transmission. The present invention relates to a surveillance camera that can accurately recognize a work situation by blocking a high-power light beam.

[0002]

2. Description of the Related Art Generally, a surveillance camera is used to achieve a specific purpose or monitor a work situation. This surveillance camera is connected to a closed circuit TV (CCTV) or the like so that the user can make adjustments while checking the work status. Of course, in the workplace, the work state is checked by the monitoring camera and the work process is controlled. Especially welding,
This surveillance camera is also used for operations such as cutting, where high-power light rays are emitted. At this time, due to the high-output light beam, it is difficult to accurately recognize the working state only by a general camera. Therefore, a surveillance camera equipped with a separate means for blocking or attenuating a light beam is used in a work place where a high-power light beam such as welding or cutting is emitted. An example for this is shown in FIG.

FIG. 1 is a view for explaining the structure of an existing surveillance camera used for welding or cutting work. As shown in FIG. 1, a blocking glass 20 is disposed on the front surface of the camera 10 to block a high-power light beam generated during welding or cutting. The light transmittance of the blocking glass 20 is fixed to a constant value. This barrier glass 20
Is rotatably connected to a shaft 22 of a rotary driver 21. This rotary driver 21 is connected to the controller 30,
The rotation signal of the rotation driver 21 is controlled by the controller 30. That is, when performing welding or cutting work, a high-power light beam is emitted, so the rotary driver 21
The rotating glass 20 is rotated by to attenuate the high-output light beam received by the camera 10. Therefore, the camera 10 can recognize the welding or cutting work state.

On the other hand, a cutting line outside the welding or cutting work,
The light beam received by the camera must not be blocked during marking work such as characters. At this time, the rotation driving device 21 drives the blocking glass 20 to remove the blocking glass 20 from the front surface of the camera 10, so that the camera 10 can accurately recognize the working state. The conventional surveillance camera as described with reference to FIG. 1 has a disadvantage that the rotating device is driven by the controller depending on whether or not a high output light beam is emitted due to welding, cutting, etc., and the operation is cumbersome and consumes a lot of energy. is there. In addition, the conventional surveillance camera has a drawback in that the intensity of the light beam emitted cannot be used to adjust the intensity of the light beam received by the camera, and thus the working state cannot be accurately recognized.

[0005]

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a surveillance camera capable of accurately recognizing the state of a surveillance target regardless of the intensity of a light beam emitted from the surveillance target.

[0006]

SUMMARY OF THE INVENTION The above-mentioned object of the present invention is a camera for monitoring the state of a predetermined object from which a light beam is emitted, the attenuation controller being installed on the path of the light beam received from the camera. A light attenuating member that adjusts the transmittance of a light beam according to the magnitude of a voltage applied from the optical sensor, an optical sensor that detects the intensity of the light beam, and the light attenuating member that detects the intensity of the light beam by the optical sensor. And a damping adjuster that adjusts the magnitude of the voltage applied to the camera.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 2 is a diagram for explaining the configuration and connection relationship of the surveillance camera according to the present invention. The camera 10 is shown in FIG. When a voltage is applied to the camera 10 after it is normally kept transparent, a special glass (a light-attenuating member that changes the transmittance of light rays by rotating a magnetic substance present inside depending on the magnitude of the voltage ( Hereinafter, referred to as speed glass) is provided. The speed glass 40 is provided on the path of the light beam received by the camera 10 and is for adjusting the intensity of the light beam received by the camera 10. In FIG. 2, the speed glass 40 is shown so as not to coincide with the light receiving direction of the camera 10 for easy understanding of the connection relationship of each component.

An optical sensor 41 is provided on the upper portion of the speed glass 40. The optical sensor 41 is for sensing the intensity of light rays received by the camera 10. As an example of using a TR operated by light as the optical sensor 41, the optical sensor 41 can change the output voltage from 0 to 5 V depending on the amount of light when there is a certain amount of light or more. 0V when there is no light
Output voltage value of The installation position of the optical sensor 41 can be changed as necessary. Such an optical sensor 41 is connected to the attenuation controller 50.

The attenuation controller 50 adjusts the voltage value applied to the speed glass 40 to adjust the speed glass 4
It is for adjusting the transmittance of 0. The attenuation controller 50 adjusts the voltage applied to the speed glass 40 by correcting the intensity of light detected by the optical sensor 41, that is, the output voltage value of the optical sensor 41. Speed glass 40
A photocell 42 is installed in the upper row. This photovoltaic cell 4
2 is for converting the high-output light energy generated during welding or cutting work into electric energy. The photocell 42 is connected to a storage battery 60 provided on the upper stage of the camera 10. The storage battery 60 is for storing the electric energy of the photovoltaic cell 42. The electric energy thus stored in the storage battery 60 is supplied to the power sources of the optical sensor 41, the attenuation controller 50 and the speed glass 40.

That is, the attenuation controller 50 adjusts the magnitude of the voltage applied to the speed glass 40 according to the intensity of light detected by the optical sensor 42. Therefore, while the speed glass 40 is in a transparent state, the magnetic substance therein rotates according to the magnitude of the applied voltage, and the transmittance is reduced. After all, the intensity of light received by the camera 10 is adjusted according to the camera 10, and the camera 10 can accurately recognize the state of the monitored object.

FIG. 3 is a view showing a state in which the speed glass is attached to the camera. As shown, the speed glass 40 is attached to the lens portion 11 of the camera 10 with a predetermined space. Since the transmittance of the speed glass 40 is adjusted as described above, it is not necessary to attach / detach the speed glass 40 to / from the camera 10 due to the change in the intensity of light rays. The operation of the surveillance camera according to the present invention described above with reference to FIGS. 2 and 3 will be described.

If a high-power light beam is emitted during welding or cutting work, the optical sensor 41 senses the intensity of the light beam and outputs it to a predetermined voltage value. This voltage value is sent to the attenuation controller 50. The attenuation controller 50 corrects the output voltage value of the optical sensor 41 to adjust the voltage applied to the speed glass 40. Due to this change in voltage, the magnetic substance inside the speed glass 40 rotates to adjust the light transmittance. Therefore, the intensity of the light beam received by the camera 10 is attenuated. Therefore, the camera 10 can accurately recognize the state of the monitoring target. At this time, if the voltage applied to the speed glass is 0 V, the speed glass 40 becomes transparent. In particular, the photovoltaic cell 42 converts light energy into electrical energy during operation, and the storage battery 60 stores this electrical energy. The electric energy stored in the storage battery 60 is used as an operating power source for the speed glass 40, the optical sensor 41, and the attenuation controller 50.

[0013]

As described above, the surveillance camera according to the present invention can accurately monitor the working conditions such as welding and cutting work by adjusting the light transmittance of the speed glass according to the intensity of the light beam. Moreover, since the light transmittance of the speed glass is automatically adjusted, it is easy to monitor the work status. Further, since the light energy generated during work is converted into electric energy and used, energy saving is easy.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a configuration of a surveillance camera used in an existing welding or cutting operation.

FIG. 2 is a diagram for explaining the configuration and connection relationship of the surveillance camera according to the present invention.

FIG. 3 is a diagram showing a state in which a speed glass is attached to a camera.

[Explanation of symbols]

 10 camera 40 speed glass 41 optical sensor 42 photocell 50 attenuation controller 60 storage battery

Claims (6)

[Claims] 1. A camera for monitoring a state of a predetermined object from which a light beam is emitted, the light beam being controlled by the magnitude of a voltage applied from an attenuation controller installed on a path of the light beam received from the camera. A light attenuating member for adjusting the transmittance, an optical sensor for detecting the intensity of the light beam, and a voltage applied to the light attenuating member for adjusting the intensity of the light beam detected by the optical sensor. A camera including an attenuation controller. 2. The camera according to claim 1, wherein the light attenuating member is speed glass. 3. The camera according to claim 2, wherein the speed glass is provided on a path of a light beam toward the lens of the camera and is separated from the lens by a predetermined distance. 4. The camera of claim 1, further comprising a photovoltaic cell that converts the light energy into electrical energy. 5. The camera of claim 4, further comprising a storage battery that stores the electrical energy converted by the photovoltaic cell. 6. The camera according to claim 5, wherein the electric energy stored in the capacitor is used as a power source for the optical sensor, the attenuation controller and the speed glass.