High-precision optical coupling self-detecting device and method

Abstract

The invention discloses a high-precision optical coupling self-detecting device and a high-precision optical coupling self-detecting method, which are used for detecting whether a device containing anoptical coupler and a motor in equipment is in a normal operating state or encounters a failure, and effectively determining an in-place position and an in-place threshold vale of in-place detectionrapidly at high precision. The high-precision optical coupling self-detecting device at least comprises the motor, a first component, and the optical coupler, wherein the motor is connected with the first component by means of a linkage unit; and the self-detecting device further comprises a controller used for detecting whether the device fails or is in place according to self-detecting parameters. The high-precision optical coupling self-detecting device and the high-precision optical coupling self-detecting method utilize an optical coupler detection signal fed back by means of the opticalcoupler device for detection, can be applied to various kinds of equipment requiring in-place detection, directly feed back failure conditions without using an instrument or detaching the equipment device, can improve the precision and accuracy of the in-place detection through performing conditional judgment and automatically setting the appropriate threshold, are fast and intuitive in the detection result, improve the efficiency of the factory delivery detection, prolongs the service life of the equipment, and improve the user experience.

Description

technical field [0001] The invention relates to the field of automatic detection, in particular to a high-precision optocoupler self-inspection device and a self-inspection method. Background technique [0002] The development of projection technology has made projection equipment more and more popular in the office and home fields. The use of projection equipment involves position detection or in-position detection of the focus motor / electric door or other components to obtain the best projection effect. Some of the existing motorized focus or auto-focus projection devices on the market use general-purpose input and output interfaces (GPIO) or analog-to-digital conversion circuits (ADC) to connect to optocoupler devices, and feedback detection results through GPIO interface data or ADC values. Usually, the GPIO interface judges the position through level changes, and the ADC judges the position by setting a constant (usually 125) for comparison. However, there are many def...

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Problems solved by technology

However, there are many defects in the above-mentioned prior art. First, the tolerances in the batch manufacturing of mechanical structures lead to deviations in the individual comparison values ​​for each device structure, resulting in inaccurate detection results; secondly, in the position detection based on level changes The position where the signal changes is usually not a precise point but a position range, and the level change cannot accurately reflect the change of the position of the moving part; and the ADC is used to detect the voltage value of the optocoupler feedback, which is generally directly set by the program If a constant is used as the judgment threshold, there will be problems such as poor accuracy, the set value may be a critical value, and poor system compatibility; in addition, focusing equipment usually uses a fixed focusing stroke set by a program, but in actual mass production Due to the fixed focusing distance due to manufacturing tolerances, some machines will not be able to fully adjust the focus, so some models will be stuck in structure and damage the motor, and the optocoupler may be damaged in actual testing. In both cases, The existing technology usually uses a voltmeter to test the level change method, and it needs to be disassembled to measure after the whole machine is installed, and the processing process is very troublesome.

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