JPS63313985A - Television calling unit - Google Patents

Abstract

PURPOSE:To eliminate conventional lighting power supply line between a master unit in the room and a slave unit at the door by supplying power to the slave unit from the master unit, providing a first power supply means to receive power for video, and providing a second power supply means to supply power to light-emitting elements for lighting. CONSTITUTION:The in-room master unit 1 is constituted of an in-room master monitoring part 1a and in-room master calling part 1b. The monitoring part 1a consists of a control circuit 8, a constant current circuit 11 as power supply means, and a television monitor 15. The at-door slave unit is constituted of a light-emitting circuit 2a for lighting as the second power supply unit, camera unit 2b, calling/outgoing means 2e, and a fixed current/fixed voltage conversion circuit 12 as the first power supply means. When a visitor depresses the calling button 3 of the slave unit 2, a fixed current for video from the circuit 11 is superposed on the central conductor of a coaxial cable CXC connected to the master unit 1 with the slave unit 2 and the current is supplied to the camera unit 2b, and a part of the current is also supplied to the circuit 2a, so that infrared light-emitting diodes OED1-LEDn as the light-emitting elements for lighting emit light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a television communication device, and more particularly to a television communication device in which a light emitting element for illumination is provided in an entrance handset.

[Technical Background of the Invention and Problems There have been conventionally known video communication devices in which a light-emitting element for lighting is installed in the entrance handset, but this type of device has a specially wired line for lighting. Ta. FIG. 2 is a block diagram showing a conventional video call device.

In Fig. 2, 1' is the indoor base unit and the indoor base unit monitor section la
' and an indoor base unit communication unit 1b. The indoor main unit monitor unit 1a' includes a TV monitor 15, a constant current circuit 11 that supplies camera power, and a switching circuit 9 that supplies lighting power.
and a control circuit 8 that controls a television monitor 15, a constant current circuit 11, and a switching circuit 9.

2' is an entrance cordless unit that includes lighting circuit 2a' and camera unit 2.
b and a communication/calling means 2e. The lighting circuit 2a' includes a plurality of illumination light-emitting cord LEDs, . . . LEDn,
Resistance 13. It consists of a protection diode 14. The camera unit 2b includes a television camera 6 and a constant current/constant voltage conversion circuit 12 that supplies power to the television camera. The calling/calling means 2e includes a call button 3, a microphone 4. It is comprised of a speaker 5 and a calling circuit 2C that processes these signals. Connections between the indoor master unit 1' and the entrance slave unit 2' are made using terminals P, P', P5, and P'6 as communication paths.

L2 connects terminals P3, p+, and P4, P'4 to terminals P1, P'1, P2, and coaxial cable CXC.
P'2 is connected to lighting power supply lines L3 and L4, respectively. The camera unit 2b of the entrance handset 2' has a built-in light receiving element such as a COD which has excellent sensitivity in the infrared region. For this reason, an infrared light emitting diode is employed as a light emitting element of the illumination circuit 2a' of the entrance slave unit 2'.

Next, the operation will be explained. When a visitor presses the call button 3, the control circuit 8 provided in the indoor base unit monitor section la' of the indoor base unit 1' detects the call, and its output activates the TV monitor 15, and the constant current circuit 11 displays the video image. A constant current for the camera power supply is superimposed on the signal coaxial cable CXC.

It is supplied to the camera unit 2b. A video signal and a constant current for camera power supply are received and received via the center conductor and outer conductor of the coaxial cable CXC. Usually, the outer conductor is terminal P4,
P'. It is connected to the base potential point. The center conductor is terminal P
3 and P'3, and the voltage of the power supply circuit 10 is supplied via a constant current circuit 11 corresponding to a power supply means.

Furthermore, the switching circuit 9 is controlled by the control circuit 8.
is switched on, and power for lighting is supplied from the power supply circuit 10 to the lighting circuit 2a'' of the entrance slave unit 2' via lines L1 and L4.

Since the conventional video communication device is configured as described above, the lighting power for the infrared light-emitting diodes LED to LEDn must be supplied via the lighting power supply lines 1 and L4. It has disadvantages such as the need for additional materials and wiring work.

[Object of the Invention] The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a television communication device that does not include a power supply line for lighting.

[Summary of the Invention] The videophone device of the present invention includes a camera unit, a light-emitting element for illumination for displaying a subject, and a doorway handset equipped with a calling/calling means, and a television connected to the camera unit of the doorway handset by a coaxial cable. It consists of an indoor main unit equipped with a monitor and power supply means. The entrance slave device is provided with a first power receiving means for receiving power supplied from the power supplying means of the indoor base unit and obtaining power for video, and a second power receiving means for obtaining power for the light emitting element for lighting. , the power source for video and the power source for the light emitting element for illumination are arranged on the coaxial cable.

[Embodiment of the Invention] Hereinafter, an embodiment of the television communication device of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and the same components as those in the block diagram of FIG. 2 are given the same reference numerals, so the description thereof will be omitted.

In FIG. 1, 1 is an indoor base unit. The indoor base unit 1 includes an indoor base unit monitor section 1a and an indoor base unit communication section 1b. Further, the indoor main unit monitor section 1a is composed of a control circuit 8, a constant current amount 18811 as a power supply means, and a television monitor 15.

The entrance handset 2 is comprised of a lighting circuit 2a as a second power receiving means, a camera unit 2b, a calling/calling means 2e, and a constant current/constant voltage conversion circuit 12 as a first power receiving means.

The illumination light emitting circuit 2a includes infrared light emitting diodes LED, ~LEDn, and current setting resistors R connected in series with the respective diodes as light emitting elements for illumination to project the subject.
1 to Rn, a current adjustment resistor Raj, an infrared diode protection diode D1, and a video signal passing capacitor C, which are connected in parallel. The configurations of the camera unit 2b and the communication/calling means 2e are the same as the conventional ones. Indoor master unit 1 and entrance slave unit 2 are connected to terminals P3, P'3 and P.
4. P' is connected by coaxial cable CXC.

[Operation of the invention] When a visitor presses the call button 3 of the entrance handset 2, the coaxial cable C connects the indoor main unit 1 and the entrance handset 2 in the same way as described above.
A constant current for video from a constant current circuit 11 serving as a power supply means is superimposed on the center conductor of xC, and is supplied to the camera unit 2b, and a part of it is also supplied to the light emitting circuit 2a for illumination,
Infrared light emitting diode LED as a light emitting element for lighting,
~LEDn can be made to emit light.

[Effects of the Invention] The present invention provides a first power receiving means for receiving power supplied from the power supply means of the indoor main unit to the entrance slave unit, and for obtaining power for video, and a first power receiving means for obtaining power for the light emitting element for illumination. Since the device has a compact configuration including the power receiving means 2, it is characterized in that the power source for the light emitting element is obtained by superimposing the power source for video on the coaxial cable. Therefore, there is an effect that the conventional lighting power supply line provided between the indoor master unit and the entrance slave unit can be omitted.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a television communication device according to the present invention, and FIG. 2 is a block diagram of a conventional television communication device. 1... Indoor base unit 1a... Indoor base unit monitor section 1b... Indoor base unit talking section 2... Entrance slave unit 2a...・Lighting light emitting circuit (second power receiving means) 2b... Camera unit 2c... Calling circuit 10... Power supply circuit 11... Constant current circuit (power supply Means) 12...
... Constant current constant voltage conversion circuit (first power supply means) 15 ... TV monitor CXC ... Coaxial cable agent Patent attorney Moritani - Yu Figure 2

Claims (1)

[Claims] An entrance handset equipped with a camera unit, a light-emitting element for illumination to project the subject, and a means for calling/calling; an indoor base unit equipped with a TV monitor and a power supply means connected to the camera unit of the entrance handset by a coaxial cable; A video communication device comprising: a first power supply receiving means for receiving power supplied from the power supply means of the indoor base unit to obtain power for video; and a second power receiving means for obtaining power for the light emitting element for illumination. What is claimed is: 1. A television communication device, comprising: means for superimposing a power source for video and a power source for a light emitting element for illumination on the coaxial cable.