JPH0411429Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an entrance unit with a built-in camera in a video intercom device that has a built-in camera in the entrance unit and can monitor visitors from the living room side.

[Technical background of the invention] In the conventional video door intercom device, as shown in FIG. 4, the entrance device 1' has a built-in camera 20 and an illumination lamp 21. This illumination lamp 21 is originally intended to illuminate visitors at night to obtain good images, and is also designed to incidentally indicate the operating status of the camera. As shown in FIG. 5, the power supply line 22 of the illumination lamp 21 is provided separately from the camera video line 23 and the telephone line (not shown), and its operation is controlled by the visitor who presses the call button on the entrance unit 1'. Press 24 to turn on the lighting lamp 21.
lights up, power is supplied to the camera 20, and the camera 20 starts operating. At the same time, the video doorphone room unit 25 rings and the monitor screen 2
6 The visitor is shown above.

In such conventional video door intercom devices, an image pickup tube such as a videocon is used as a camera, and a light bulb is used as an illumination lamp, so that the shape of the entrance device is inevitably large. In addition, a power supply line for the lighting lamp was required in addition to the camera video line and telephone line. Furthermore, when a visitor presses a call button, the lighting lamp turns on and suddenly illuminates the visitor, causing great discomfort to the visitor.

[Purpose of the invention] The present invention was devised in view of the above-mentioned conventional problems.It clearly shows the imaging operation status of the camera to the visitor, takes into account the privacy of the visitor, does not cause discomfort, and has a simpler circuit. The purpose is to provide a small entrance device with a built-in camera.

[Summary of the invention] In order to achieve this purpose, the entrance unit with a built-in camera of the invention connects the room unit and the entrance unit with a coaxial cable that superimposes the camera video signal and camera power, and connects the coaxial cable with the power supply line. The power supply line is connected to the high-sensitivity CCD built in the entrance unit via a constant current-constant voltage conversion circuit.
(Charge Coupled Device) This is connected to the camera, and the branch line is connected via a limiting resistor to a light emitting diode that displays the operating status of the CCD camera.

[Embodiments of the invention] Hereinafter, embodiments of the entrance device with a built-in camera according to the invention will be described based on the drawings.

FIG. 1 is a diagram showing the appearance of an entrance device 1 with a built-in camera according to the present invention, which is equipped with a camera 2, an indicator light 3 for displaying the operating status of the camera, a call button 4, a speaker 5, and a microphone 6. A CCD camera is provided as camera 2. For example, a light emitting diode is used for the indicator light 3.

FIG. 2 shows a circuit diagram of the entrance unit 1 and the room unit 7. Note that the telephone line is omitted in FIG. 2. A monitor screen 8 for projecting images from the camera 2 and a constant current circuit 9 as a power source for the camera 2 are provided on the room unit 7 side. Living room machine 7
and the entrance device 1 are connected by a coaxial cable 10 that superimposes a camera video signal and a camera power source. The coaxial cable 10 is connected to a power supply line 11 connected to the camera 2 via a constant current-constant voltage conversion circuit 12 in the entrance unit 1 and a branch line 15 connected to the light emitting diode 14 via a limiting resistor 13. Branch out. The limiting resistor 13 is for allowing an appropriate current to flow through the light emitting diode 14 which is the indicator lamp 3.

In such a configuration, when a visitor presses the call button 4 of the entrance device 1, a constant current is sent from the constant current circuit 9 to the power supply line 11 on the entrance device 1 side via the coaxial cable 10, and the constant current - After being converted into a constant voltage by the constant voltage conversion circuit 12, the voltage is applied to the camera 2, and the camera 2 operates. At the same time, a constant current is sent to the light emitting diode 14 via the branch line 15 and the indicator light 3
lights up, allowing the visitor to know that the camera 2 is operating. On the other hand, on the room unit 7 side, when the call button 2 is operated, a ring tone sounds, and when the camera 2 is operated, the visitor is displayed on the monitor screen 8.

In this embodiment, the power supply line 11 is branched at a constant current and connected to the display light emitting diode 1.
However, as shown in FIG. 3, the light emitting diode 14 may be turned on after being converted to a constant voltage.

[Effects of the invention] As is clear from the above explanation, according to the entrance unit with a built-in camera of the invention, the room unit and the entrance unit are connected by a coaxial cable that superimposes camera video signals and camera power, and the coaxial cable is used as a power source. The power supply line is branched into a supply line and a branch line, and the power supply line is connected to the high-sensitivity CCD (charge-coupled device) camera built into the entrance unit via a constant current-constant voltage conversion circuit, and the branch line is connected via a limiting resistor. Since the CCD camera is connected to a light emitting diode that displays the operating status of the camera, it not only has a long lifespan and does not require periodic replacement, but also is smaller because it does not require a lighting bulb compared to the photo tube method. It is possible to monitor the monitor without causing any discomfort to visitors, and it is also equipped with an indicator light so that visitors can see that they are being monitored, giving consideration to the privacy of visitors. Moreover, since the power supply line for the camera is branched, there is no need to provide a dedicated power line for the indicator light.

[Brief explanation of drawings]

Figure 1 is an external view of the entrance device with a built-in camera according to the present invention.
Figure 2 is a diagram showing an example of the circuit configuration of the entrance unit and room unit, Figure 3 is a diagram showing another example of the circuit configuration of the entrance unit, and Figure 4 is a conventional entrance unit with a built-in camera. Figure 5 is a circuit diagram of the entrance unit and room unit. 1... Entrance unit, 2... CCD camera, 3... Indicator light, 7... Room unit, 10... Coaxial cable, 1
1... Power supply line, 12... Constant current-constant voltage conversion circuit, 13... Limiting resistor, 14... Light emitting diode, 15... Branch line.

Claims (1)

[Scope of utility model registration request] The room unit 7 and the entrance unit 1 are connected by a coaxial cable 10 that superimposes a camera video signal and a camera power supply, and the coaxial cable 10 is connected to a power supply line 11.
and a branch line 15, the power supply line is connected to the CCD camera 2 of the entrance device 1 via a constant current-constant voltage conversion circuit 12, and the branch line is connected to the CCD camera 2 via a limiting resistor 13. An entrance device with a built-in camera, characterized in that it is connected to a light emitting diode 14 that displays the operating status of the camera.