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A safety limit control method for focusing mechanism

A control method and safe technology, applied in installation, instrument, optics and other directions, can solve the problems of inappropriate camera focusing mechanism, the operation of focusing mechanism cannot be directly observed, etc., achieve good real-time performance, prevent mechanical collision, The effect of reducing the impact of reliability

Active Publication Date: 2020-02-07
北京长峰科威光电技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 4. The operation of the focusing mechanism cannot be directly observed. When an abnormal situation occurs, it is necessary to prompt the fault through other means
Therefore, the traditional method of connecting the limit switch in series in the motor control circuit is not suitable for the camera focusing mechanism

Method used

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  • A safety limit control method for focusing mechanism

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Embodiment Construction

[0025] The implementation method of the present invention is as follows:

[0026] One limit switch is installed at the left and right limit positions of at least one stroke interval of the focusing mechanism, and the normally closed contacts of all limit switches (at least two) are suspended, and the normally open contacts are connected to the reference ground of the system control circuit. After the output terminals of all limit switches are short-circuited, a "limit state feedback" signal is generated, which is pulled up to the power supply of the system control circuit through a resistor in the system control circuit. At this time, the "multi-channel OC gate line AND" logic output formed by the limit switch and the pull-up resistor, that is, when any limit switch output becomes low, the "limit status feedback" signal outputs a low level. The "limit status feedback" signal is used to drive the GPIO pin of the control system processor and a signal input pin of the dual optocoupl...

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Abstract

A safety limit control method for a focus adjustment mechanism, in which a limit switch is installed at the left and right limit positions of at least one stroke interval of the focus adjustment mechanism, and the output ends of all the limit switches are short-circuited to lead out a "limit status feedback" signal , used to drive the GPIO pin of the control system processor and one signal input pin of the dual optocoupler chip; the control system processor receives the "limit status feedback" signal and outputs the "software power-on enable" signal; " Both the "limit status feedback" signal and the "software power-on enable" signal are input to the signal input terminal of the dual-channel optocoupler chip, and are isolated and output by the dual-channel optocoupler chip, and then pulled down to the reference ground of the power supply through a resistor, and then output "Drive circuit power-on enable" signal; when the "drive circuit power-on enable" signal is high level, it provides power to the motor drive circuit; otherwise, cuts off the power supply to realize the safety limit of the focusing mechanism.

Description

Technical field [0001] The invention belongs to the field of camera focusing mechanism control, and relates to a safety limit control method for focusing mechanism, which is used for safety limit control of the stroke range of the focusing mechanism. When the focusing mechanism exceeds the preset stroke range and reaches the limit position Cut off the power supply of the motor to prevent mechanical collision. Background technique [0002] In the field of industrial control, limit switches are generally installed in a predetermined position and connected in series in the motor control circuit when they are used. When the module mounted on the moving part hits the limit switch, the contact of the limit switch will act to realize the control circuit Switch. [0003] Compared with the conventional industrial control field, the camera focusing mechanism control has the following characteristics: [0004] 1. The control accuracy is high. It requires the use of high-precision zero calibra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/10G02B7/105
CPCG02B7/102G02B7/105
Inventor 于龙洋
Owner 北京长峰科威光电技术有限公司
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