JPS6141193Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video recording device, and more particularly to a device for monitoring the operating status of the video recording device on the camera side.

Various abnormalities that occur in video recording devices, such as VRTs (when there is no video signal to be recorded, when servos such as the capstan, rotating head drum, and tape tension do not operate normally,
If dew is detected on the drum surface, the tape becomes slack due to poor tape winding, the battery voltage drops, etc., an alarm will be displayed on the VTR itself. Usually, the VTR body has individual alarm indicators to distinguish and display abnormal conditions. It is often desirable for a camera connected to a VTR via a cable to know about abnormalities occurring in the VTR itself. However, cameras are made as light as possible and there is little room for a display. Furthermore, an increase in the number of cable lines between the VTR body and the camera must be avoided.

The present invention was developed to meet the above requirements, and is based on the fact that the camera only needs to issue an alarm to indicate that an abnormality has occurred in the VTR itself, and there is no need to distinguish and display the details of the abnormality. .
In order to avoid increasing the number of cable lines to the camera, an alarm signal is normally supplied when the VTR body is abnormal in conjunction with a recording status instruction signal for instructing the camera side of the recording status to the VTR body. This alarm signal gives a flashing display to the light emitting device on the camera, which remains lit when the VTR is recording normally.

FIG. 1 is a circuit diagram of a device according to an embodiment of the present invention.
Various alarms that occur in the VTR body are handled by OR circuit 12.
is applied as a high level signal to the inputs A, B...X. Therefore, regardless of the type of abnormality, if any abnormality occurs, a high level signal is generated at the output of the OR circuit 12 (FIG. 2B). This signal is applied as a strobe signal to the other input of an AND circuit 14 which receives at one input, for example, a 1 Hz, duty 50 alarm pulse (FIG. 2A). The output alarm pulse of the strobed AND circuit 14 is shown in FIG.
applied to one of the inputs of circuit 16. exclusive OR
The other input of the circuit 16 is supplied with a signal (FIG. 2D) which becomes high level when the VTR is in the recording mode. As is well known, an exclusive OR circuit provides a high level output only when one of the inputs is high level. Therefore, the output of FIG. 2E occurs at the output of the exclusive OR circuit.

In other words, the output of the exclusive OR circuit 16 is a continuous high level signal in the normal recording mode, and an alarm pulse is output while the VTR is in an abnormal state.

The exclusive OR circuit output is sent from the VTR main unit to the LED light emitting device 2 on the camera side via line 18 in the cable.
given to 0. Therefore, this LED will be lit continuously when the VTR is in normal recording mode and will flash during the occurrence of a VTR malfunction.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is an operational waveform diagram of the same circuit. In the figure, 12 is an OR circuit, 14 is an AND circuit, 16
18 is an exclusive OR circuit, 18 is a cable line, and 20 is a camera side LED light emitting device.

Claims (1)

[Scope of utility model registration request] In a video recording device in which a recording device main body is connected to a camera section via a light emitting device, the camera section is provided with a light emitting device, and when the recording device main body is in a recording mode, the light emitting device is turned on continuously. a continuous lighting signal generator that generates a signal of 1; an abnormality detection means that detects that an abnormality has occurred in the recording apparatus main body; and an abnormality detection means that detects an abnormality in the recording apparatus main body; A blinking signal generating means for generating a second signal for blinking the apparatus, and an exclusive OR circuit to which the first and second signals are input are provided in the main body of the recording apparatus, and the exclusive OR circuit is provided with: A video recording device characterized in that an output signal is provided to a light emitting device via the cable.