JPH0742262U - TV intercom device - Google Patents

Abstract

(57) [Summary] [Structure] The camera 3 which receives the image of the visitor from the lens 1 and converts it into an image signal by the CCD image pickup device 2 and generates a timing signal for driving the CCD image pickup device and CC
D CCD image sensor drive / signal conversion circuit 4 for converting the video signal converted by the D image sensor into a video signal, a video amplifier 5 for amplifying the video signal and sending it to the master unit 9, and an amplitude representing the brightness of the video signal. The electronic shutter circuit 6 that controls the timing signal at the responded shutter speed, the dimmer device 7 that controls the amount of light incident on the CCD image sensor, and the dimmer device that controls the voltage applied to the dimmer device in response to the brightness of the video signal. And an optical device control circuit 8. [Effect] By controlling the light control device 7 that controls the amount of light incident on the CCD image pickup device, an appropriate image can be obtained even at a brightness exceeding the range of the electronic shutter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a TV intercom apparatus, and more particularly to a TV intercom apparatus including a dimming device that controls the amount of light incident on a CCD image sensor.

[0002]

[Prior art]

 As shown in FIG. 4, in the conventional TV intercom apparatus, the entrance cordless handset 92 includes a camera 30 that receives an image of a visitor from the lens 1 and a CCD image pickup device 2 converts the image into a video signal, and a CCD image pickup device 2. A CCD image sensor drive / signal conversion circuit 4 for generating a timing signal for driving the CCD and converting the video signal converted by the CCD image sensor 2 into a video signal, and a video for amplifying the video signal and sending it to the master unit 9. The amplifier 5 and the electronic shutter circuit 6 for controlling the timing signal at the shutter speed in response to the amplitude representing the brightness of the video signal were provided.

The operation of this television intercom apparatus is as follows. An image of a visitor (subject) entered from the lens 1 is formed on the CCD image pickup device 2 and converted into a video signal, and the video signal is converted into a video signal by the CCD image pickup device drive / signal conversion circuit 4 and then in the video amplifier 5. It is amplified and sent to the base unit 9. In taking an image, the electronic shutter circuit 6 responds to the brightness of the subject, that is, to the amplitude representing the brightness of the video signal sent from the CCD image sensor driving / signal converting circuit 4, for 1/60 to 1/10000 seconds. It controls the timing signal sent to the CCD image pickup device 2 at the shutter speed, and works so that the video signal input to the video amplifier 5 becomes constant.

[0004]

[Problems to be solved by the device]

 Since the conventional TV intercom apparatus is configured as described above, the amount of light incident on the CCD image pickup element 2 increases during a bright midsummer day, which exceeds the range in which the electronic shutter circuit 6 operates. As shown in FIG. 5, the video signal input to the video amplifier 5 exceeds the proper output. For this reason, a filter or the like for reducing the amount of light is used on the front surface of the lens 1, but conversely, there is a problem in that the filter for reducing the amount of light causes a shortage of the amount of light when the surrounding illuminance decreases.

[0005]

【Purpose】

 The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a television intercom apparatus including a light control device capable of adjusting the amount of light incident on a CCD image sensor.

[0006]

[Means for Solving the Problems]

 The television intercom apparatus according to the present invention generates a timing signal for driving a CCD image sensor and a camera for converting a video signal of a visitor into a video signal by a CCD image sensor and converting the image signal by the CCD image sensor. A CCD image sensor drive / signal conversion circuit that converts the video signal into a video signal, a video amplifier that amplifies the video signal and sends it to the master unit, and a timing signal at a shutter speed that responds to the amplitude that represents the brightness of the video signal. An electronic shutter circuit for controlling, a dimming device for controlling the amount of light entering the CCD image sensor, and a dimming device control circuit for controlling the voltage applied to the dimming device in response to the amplitude representing the brightness of the video signal. Is equipped with.

[0007]

[Action]

 A television intercom apparatus according to the present invention comprises a dimming device for controlling the amount of light incident on a CCD image sensor, and a dimming device for controlling the voltage applied to the dimming device in response to the amplitude representing the brightness of a video signal. Since it has a control circuit, it can be adjusted on the base unit side by increasing or decreasing the amount of light entering the CCD image sensor, whether it is in bright summer days such as daylight or cloudy weather. You can get images of visitors.

[0008]

【Example】

 Hereinafter, an embodiment of a TV intercom apparatus according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, in the TV intercom apparatus according to the present invention, the entrance cordless handset 91 includes a camera 3 that receives an image of a visitor from a lens 1 and a CCD image pickup device 2 converts the image into a video signal, and a CCD image pickup device 2. A CCD image sensor driving / signal conversion circuit 4 which generates a timing signal for driving the image signal and also converts the video signal converted by the CCD image sensor 2 into a video signal, and amplifies the video signal and sends it to the master unit 9. A video amplifier 5, an electronic shutter circuit 6 that controls the timing signal at a shutter speed that responds to the amplitude that represents the brightness of the video signal, and a light control device that is provided in front of the lens 1 and that controls the amount of light entering the CCD image sensor 2. And a dimming device control circuit 8 for controlling the voltage applied to the liquid crystal shutter 7 in response to the amplitude representing the brightness of the video signal. There.

Although the liquid crystal shutter 7 is provided on the front surface of the lens 1 in FIG. 1, it may be provided on the rear surface, and a dimming device other than the liquid crystal shutter is also suitable. As shown in FIG. 3, the dimming device control circuit 8 is composed of a PWM generation circuit 81 and a liquid crystal driver 82, and controls the brightness of the video signal sent from the CCD image pickup device drive / signal conversion circuit 4 to the video amplifier 5. The duty ratio of the PWM signal is changed according to the voltage applied to the liquid crystal shutter 7 by the PWM generation circuit 81 so as to change the density of the liquid crystal shutter 7 based on the amplitude (voltage) indicating Then, a voltage is applied from the liquid crystal driver 82 to the liquid crystal shutter 7.

The operation of the TV intercom apparatus according to the present invention is as follows. The image of the subject entered from the lens 1 is formed on the CCD image pickup device 2 and converted into a video signal, and the video signal is converted into a video signal by the CCD image pickup device driving / signal conversion circuit 4 and amplified by the video amplifier 5, It is sent to the machine 9. Upon capturing an image, the electronic shutter circuit 6 responds to the brightness of the subject, that is, to the amplitude representing the brightness of the video signal sent from the CCD image sensor driving / signal conversion circuit 4 to the video amplifier 5, and the 1/60 to 1 The timing signal sent to the CCD image pickup device 2 at a shutter speed of / 10 000 seconds and driving the CCD image pickup device 2 is controlled, and the video signal input to the video amplifier 5 is made constant.

During a bright midsummer day beyond the range where the electronic shutter circuit 6 operates, as shown in FIG. 2, a dimming device is provided so that the video signal input to the video amplifier 5 maintains an appropriate output. The control circuit 8 operates and the liquid crystal shutter 7 operates. The dimming device control circuit 8 changes the voltage applied to the liquid crystal shutter 7 so as to limit the amount of light incident on the CCD image pickup device 2. By operating the liquid crystal shutter 7, even when it is brighter than the electronic shutter limit range, the light amount is appropriately increased and decreased to enter the CCD image sensor, so that an appropriate visitor image can be obtained on the master side. .

[0012]

[Effect of device]

 As is clear from the above embodiments, the television intercom apparatus according to the present invention comprises a dimming device that controls the amount of light incident on the CCD image pickup device, and a voltage applied to the dimming device that represents the brightness of the video signal. Since it is equipped with a dimming device control circuit that controls in response to, an appropriate image can be obtained even at a brightness exceeding the range of the electronic shutter. Further, since the light amount is not reduced in a dark place like when using a filter, it is possible to obtain an image corresponding to a wide range of light incident amount.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a television intercom apparatus according to the present invention.

FIG. 2 is a diagram for explaining the operation of the TV intercom apparatus according to the present invention.

FIG. 3 is a block diagram of a dimming device control circuit of the television intercom apparatus.

FIG. 4 is a diagram illustrating a conventional TV intercom device.

FIG. 5 is a diagram illustrating an operation of a conventional TV intercom apparatus.

[Explanation of symbols]

 1 ... Lens 2 ... CCD image pickup device 3 ... Camera 4 ... CCD image pickup device drive / signal conversion circuit 5 ... Video amplifier 6 ... Electronic shutter circuit 7 ... Light control device 8 ... Light control device control circuit 9 ... Master device

Claims (1)

[Scope of utility model registration request] 1. An image of a visitor is incident on a lens (1) and is received by a lens C.
A camera (3) that converts a video signal with a CD image sensor (2)
A CCD image sensor drive / signal conversion circuit (4) for generating a timing signal for driving the CCD image sensor and converting a video signal converted by the CCD image sensor into a video signal; and amplifying the video signal. A video amplifier (5) for sending to the master unit (9), an electronic shutter circuit (6) for controlling the timing signal at a shutter speed in response to an amplitude representing the brightness of the video signal, and an input to the CCD image sensor. A light control device (7) for controlling the amount of light; and a light control device control circuit (8) for controlling a voltage applied to the light control device in response to an amplitude representing the brightness of the video signal. TV intercom device to do.