JPS633571A - Video camera - Google Patents

Abstract

PURPOSE:To reduce unnecessary power consumption and extend the life of parts by detecting a signal responding to the motion of an object and making a video camera operated for a predeterminate time after detection on a basis of this detection signal. CONSTITUTION:When an auto-focusing circuit 1 outputs a voltage signal corresponding to the motion of the object, the voltage signal (voltages in both ends of an autofocusing motor 21 is detected by a motor driving detection circuit 4 to start counting of a timer. The circuit 4 supplies 5V voltage signal to a power supply control circuit 7 until the predeterminate time when the timer expires elapses, and the power supply control circuit 7 makes a video circuit 5 operated while this 5V voltage signal is supplied. When the timer expires, it is discriminated whether there is a difference between potenials in both ends of the auto-focusing circuit 2 or not, and supply of 5V voltage signal is stopped when the potential difference is not discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video camera, and more particularly to a video camera suitable for reducing power consumption and extending the life of parts of a video camera having an autofocus device. .

[Conventional technology]

2. Description of the Related Art Conventionally, some video cameras have an autofocus device that automatically focuses according to the movement of a subject. Such a video camera is said to be effective as a surveillance video camera installed near a cash card machine in a bank, for example, for the purpose of surveillance.

Furthermore, conventionally, video cameras (such as the above-mentioned surveillance video cameras) are always in a 74-operation state, regardless of the presence or absence of a subject, ie, a person. There are nine common ones.

Note that an autofocus device for a video camera is described in Japanese Patent Application Laid-Open No. 127482/1982.

[Problem that the invention seeks to solve]

- As mentioned above, in the conventional technology, the video camera is always in an operating state (coupled state) regardless of the presence or absence of a subject such as a person.
However, since they are used in large quantities, there are problems in that they consume unnecessary power and shorten the lifespan of parts.

SUMMARY OF THE INVENTION In order to eliminate the drawbacks of the prior art described above, an object of the present invention is to provide a video camera in which the video camera body, that is, the video circuit of the video camera, is operated for a predetermined time only when the subject is moving. be.

[Means for solving problems]

The above purpose is to keep the autofocus device in an operating state at all times, detect a signal that responds to the movement of a subject that occurs in the autofocus device, and keep the video circuit of the video camera in an operating state for a scheduled time based on the detection signal. This is achieved by doing so.

[Effect]

The autofocus device operates an autofocus motor to focus the lens of the video camera according to the movement of the subject. Therefore, a signal for operating the autofocus motor is detected, and the video circuit of the video camera is controlled based on the detected signal. That is, if the subject is moving, the video circuit is set in an operating state for a scheduled time in response to a detection signal indicating this, and in other cases, the video circuit is set in an inactive state.

As a result, it is possible to reduce unnecessary power consumption and extend the life of parts. It can be realized.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, an autofocus circuit 1 outputs a voltage signal according to the movement of the subject. The autofocus motor 2 focuses the lens 3 of the video camera on the subject by rotating clockwise or counterclockwise in accordance with the voltage signal. The motor drive detection circuit 4 is
It is determined whether the autofocus motor 2 has rotated, that is, whether a potential difference has occurred between both ends of the motor 2, and when a potential difference has occurred, a signal to that effect (for example, a 5V voltage signal) is supplied to the power supply control circuit 7. .

The motor drive detection circuit 4 is composed of a microconductor heater, and counts a scheduled time with a bit timer from when a potential difference is generated between both ends of the motor 2 and autofocus is activated, and calculates the scheduled time. During this time, the 5V voltage signal is supplied to the power supply control circuit 7. Further, when the scheduled time has elapsed, Remi again determines whether or not a potential difference exists between both ends of the motor 2, and if the potential difference does not occur, the output of the 5V voltage signal is stopped. - On the other hand, if a potential difference occurs, the 5V voltage signal is continuously outputted until the scheduled time counted by the timer elapses again.

The power supply control circuit 7 includes the motor drive detection circuit 4 and the motor drive detection circuit 5.
The video circuit 5 of the video camera is put into operation in response to the V voltage signal. In this embodiment, the video circuit 5 enters the operating state almost simultaneously with the autofocus operation, so in order to quickly obtain the video signal at this time, the imaging in the video circuit 5 is performed using a solid state. This is done using an image sensor 6.

Here, the operation of this embodiment will be explained.

When the autofocus circuit 1 outputs a pressure signal according to the movement of the subject, the voltage signal, that is, the potential difference between both ends of the autofocus motor 2, is transmitted to the motor drive/direction circuit 4.
It is staged and performed. The motor drive detection circuit 4 starts counting the timer in response to the detection of the potential difference between both ends of the motor 2, and controls the power supply of the 5V voltage No. 1 until the scheduled time for the timer to count up has elapsed. Supplied to circuit 7. The power supply control circuit 7 is supplied with the 5V voltage signal. During the @ period, the video circuit 5 is activated.

Note that when the timer of the motor motion detection circuit 4 counts up, the detection circuit 4 determines whether a potential difference has occurred between both ends of the autofocus motor 20,
If it has occurred, the timer starts counting again, and the supply of the voltage signal 5.1 to the power supply control circuit 7 is continued until the scheduled time for the timer to count up has elapsed. - On the other hand, when the timer counts up, the motor drive detection circuit 4 detects the autofocus motor 2.
If it is determined that there is no difference in voltage between both ends, the supply of the 5V voltage signal is stopped.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a signal from an autofocus device generated in response to the movement of a subject is detected, and the video circuit of the video camera is kept in an operating state for a predetermined time from the time of detection. Since the number is set to 5, wasteful power consumption can be reduced and the lifespan of parts can be extended.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. In a video camera having an autofocus device, means for detecting a drive signal for an autofocus motor, and in response to the detection of the drive signal, the video circuit of the video camera is in an operating state for a scheduled time. A video camera characterized in that it is equipped with a means for 2. The means for putting the video circuit into an operating state includes a timer that starts counting in response to the detection of the drive signal, a scheduled time until the timer counts up, and a timer that starts counting when the drive signal is detected immediately after the timer counts up. Claim 1, further comprising: means for outputting a voltage signal continuously for a predetermined period of time; and a power supply control circuit for placing the video circuit in an operating state in response to the voltage signal. Video camera listed.