Method for controlling distance between light-emitting element and photosensitive element and optocoupler structure

Abstract

The invention discloses a method for controlling the distance between a light-emitting element and a light-sensitive element and an optical coupling structure, and the method comprises the steps: drilling a conical hole in a printed board, enabling a patch light-sensitive element and a patch light-emitting element to be respectively attached to two sides of the conical hole, and welding the patchlight-sensitive element and the patch light-emitting element on a bonding pad of the printed board; and controlling the distance between the light-emitting element and the photosensitive element by utilizing the thickness of the printed board. Through improvement of an optocoupler packaging mode, only the patch high-brightness lamp beads and the patch photoresistors need to be mounted in sequenceduring assembly, and the distance between the two components does not need to be adjusted without direct insertion of the components, so the mounting requirement and the assembling and debugging difficulty are reduced, the mounting efficiency and the output resistance consistency are improved, the production cost is reduced, and the problem of difficulty in field installation and debugging is solved.

Description

technical field [0001] The invention relates to a method for controlling the distance between a light-emitting element and a photosensitive element and an optocoupler structure, belonging to the technical field of optocoupler element production. Background technique [0002] Most of the liquid level testers used in the oil field testing oil well casing annulus use a liquid level tester. The liquid level signal used by this tester needs to use a filter amplifier board. The amplifier board uses an optocoupler to automatically adjust the amplification gain. The optocoupler components currently purchased in the market are usually composed of in-line photoresistors and in-line diodes. Because it is difficult to control the distance between the diode and the photoresistor by in-line diode welding, the output resistance of the optocoupler produced by this method varies greatly under the same voltage input condition, which will bury hidden dangers for later application, and it is di...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for controlling the distance between the light-emitting element and the photosensitive element and an optocoupler structure, so as to reduce the welding requirements and the difficulty of assembly and debugging, so as to solve the problem of difficulty in on-site installation and debugging and the shortcomings of the prior art

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