KR890004964Y1 - Economic circuit for electric power - Google Patents

Abstract

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Description

Power Consumption Reduction Circuit of Video Camera with Built-in Auto Focus Lens

1 is a conventional circuit diagram.

2 is a circuit diagram of the present invention.

3 is an operating time state diagram of the inventive circuit diagram.

* Explanation of symbols for main parts of the drawings

1: auto focus transmitter 2: auto focus receiver

3: distance and direction determination part 4: motor driving circuit

5: Position detection part of the autofocus lens M: Autofocus motor

SW: Mode selector switch R / P: Recording and pause signal

SW ₁ , SW _2, SW ₃ : Electronic Switch

The present invention relates to a power consumption reduction circuit of a video camera incorporating an autofocus lens.

In general, when a video camera with an auto iris is built in the auto focus mode, the recording is repeated while recording (REC) and pause (PAUSE) are repeated.

In a conventional video camera, since the auto focus mode always applies power to the motor driving circuit, unnecessary power is consumed during the pause.

In addition, in autofocus OW, the autofocus lens should always be in the center position in order to shorten the moving distance of the autofocus lens at the time of the next re-recording. It couldn't simply shut off the power applied to it.

In view of the above, the present invention cuts off the power applied to the driving circuit of the motor during pause even during auto focus mode, thereby preventing unnecessary power loss and at the same time placing the auto focus lens at the center position. It is possible to reduce the driving time during re-recording, and to configure the position detection unit of the auto focus lens between the distance and direction determination unit and the motor driving circuit, and to record and pause the motor driving circuit through each electronic switch. To control it.

When described in detail by the accompanying drawings as follows.

1 is a conventional circuit diagram of a motor driving circuit connected to an autofocus motor M by configuring the state signals of the autofocus transmitter 1 and the autofocus receiver 2 to be applied to the distance and direction determination unit 3. It is configured to be applied to (4) and the power supply (VCC) is configured to be applied to the motor driving circuit (4) through the mode switching switch (SW).

According to the conventional circuit diagram, when the mode switching switch SW is connected to the autofocus mode terminal A, the power supply VCC is always applied to the motor driving circuit 4 so that the autofocus transmitter 1 and the autonomous mode are recorded during recording. The direction control signal X and the speed control signal Y are applied from the distance and direction determination unit 3 according to the state signal of the focus receiver 2 to drive the autofocus motor M in the motor driving circuit. Therefore, unnecessary power is consumed at the time of pausing, where the control signal of the distance and direction determination part 3 is not needed.

Therefore, it is possible to consider the configuration of a function switch that simply records and pauses, but the auto focus mode of the video camera always causes a problem of reducing the adjustment focus to an intermediate position in order to capture the next image. Was.

In other words, the user of the video camera performs recording and pausing at the time of auto focus mode. If you pause the recording while recording, the tape is returned to the next recording screen for better connection of the next recording screen. In this case, it advances on the tape, matches the recorded signal first, and then actually records.

Also, it takes about 3 seconds for the focus lens to move from infinity to the proximity point in auto focus mode, so it must be reduced to the intermediate position to shorten the moving distance of the auto focus lens when pausing and re-recording again. Because of the problem, the configurator key was not able to perform all of the above operations in the case of only the function switching switch which simply records and pauses.

FIG. 2 is a circuit diagram of the present invention, in which a control circuit 10 is configured between a distance and direction determination unit 3 connected to an autofocus transmitter 1 and an autofocus receiver 2, and a motor driving circuit 4. The control circuit 10 is configured so that one side is applied to the position detecting unit 5 of the autofocus lens in the mode switching switch SW to which the power supply VCC is applied, and the other side is controlled by the electronic switch SW ₃ . After configured to be applied to the motor driving circuit (4) through (SW ₄ ) the recording and pause signal (R / P) is the motor driving circuit (4) and electronic through the electronic switch (SW _1- SW ₃ ) It is configured to control the switch (SW ₄ ).

In the present invention configured as described above, when the mode changeover switch SW to which the power supply VCC is applied is opened at the normal terminal N and connected to the autofocus mode terminal A, the power supply VCC is supplied to the position detecting unit 5 of the autofocus lens. ) Is applied to detect the output of the autofocus motor (M).

Then, the electronic switches SW _{1 to} SW ₃ are applied to the respective terminals by the recording and pause signals R / P. When the high potential signal is applied and the pause signals R / P are applied, the recording is performed. When the electronic switches SW _{1 to} SW ₃ are connected to the terminal R, and the recording and pause signals R / P of the low potential signal are applied, the electronic switches SW ₁ to the pause terminal P are applied. -SW ₃ ) is connected.

Therefore, when the recording signal of the high potential state signal is applied, the electronic switches SW _{1 to} SW ₃ are connected to the recording terminals R, and the electronic switches SW ₄ are connected, so that the power supply VCC is connected to the motor driving circuit 4. ) And the state signal of the distance and direction determination unit 3 is applied to the motor driving circuit 4 through the electronic switch SW ₁ (SW ₂ ) so that the autofocus motor M is normally driven. do.

When such a pause is made during recording, the electronic switches SW _{1 to} SW ₃ are connected to the pause terminals P to block the state signals of the distance and the direction determination unit 3 and the electronic switches SW ₄ to be stopped. As shown in (B) of FIG. 3, the autofocus lens position detector 5 detects the current state of the autofocus motor M while applying the power supply VCC to the motor driving circuit 4. The motor driving circuit (4) through the pause terminal (P) of the electronic switch (SW ₁ ) (SW ₂ ) to automatically cope with the next recording by placing the auto-focus lens in the center position for the same time as (C). When the autofocus lens is placed in the center position, the output of the autofocus lens position detection unit 5 is cut off, so the electronic switch SW ₄ is shut off to cut off the power applied to the motor driving circuit 4. I can cut off power supply .

As described above, the present invention drives the autofocus motor by the output of the position detection unit 5 of the autofocus lens during pause when the recording and pause are repeatedly taken in the autofocus mode. By reducing the power supply (VCC) applied to the motor driving circuit (4) after reducing the drive time of the auto focus lens when re-recording to be placed there is an effect that can reduce the power consumption.

Claims (1)

In a video camera circuit incorporating an autofocus lens, a position detection unit (5) of the autofocus lens is formed between the distance and direction determination unit (3) and the motor driving circuit (4) of the motor changeover switch (SW). After the power supply VCC is applied to one side and the power supply VCC on the other side is configured to be applied to the motor driving circuit 4, the recording and pause signals R / P are applied to the electronic switches SW ₁ -SW. ₃ ) Power saving circuit of video camera with built-in auto focus lens configured to control motor driving circuit (4) and electronic switch (SW ₄ ) through.