Photoelectric-integrated mechanical shaft keyboard switch module

Abstract

The invention discloses a photoelectric-integrated mechanical shaft keyboard switch module comprising a housing, a button cap installed on the upper part of the housing, and a driving device, a photoelectric switch, a moving optical assembly and a fixed optical assembly which are arranged in the housing. The moving optical assembly is installed on the driving device. The photoelectric switch comprises a PCB board, and an SMD IR tube and an SMD PT tube which are integrated on the PCB board. By pressing the button cap, the driving device is enabled to drive the moving optical assembly to move up and down, thereby controlling the relative position between the moving optical assembly and the fixed optical assembly. When light emitted by the SMD IR tube is coupled to the SMD PT tube, a light path is conducted, and the photoelectric switch is switched on; and when the light emitted by the SMD IR tube cannot be coupled to the SMD PT tube, the light path is open, and the photoelectric switch is switched off. The photoelectric-integrated mechanical shaft keyboard switch module has the advantages that the manual and welding cost is greatly lowered, the welding positioning is accurate, the production efficiency is high, and the quality stability of the product is high.

Description

technical field [0001] The invention relates to a switch assembly used in a keyboard of a character input system (such as a computer input system), and more specifically relates to a photoelectric integrated mechanical shaft keyboard switch module used for character input. Background technique [0002] Keyboards are divided according to Switch (commonly known as: switch control principle or axis), which can be roughly classified into 5 categories, namely membrane keyboard, conductive rubber keyboard, non-contact electrostatic capacitive keyboard, mechanical keyboard, and photoelectric keyboard. The membrane-type keyboard generally has three membranes inside, the top one is a positive circuit, the middle is a spacer layer, and the bottom is a negative circuit. The working principle is to press down on the mechanical module by tapping the key cap, and the upper and lower films can be contacted and energized to complete the conduction, so it is called a membrane keyboard. The ...

AI Technical Summary

Problems solved by technology

But all there is following shortcoming in the photoelectric keyboard of prior art at present: 1. all do not have the optical design of collimating and concentrating system between transmitting tube and receiving tube, because the luminous angle of transmitting tube is relatively large, adopt light-shielding plate (or non-transparent The outer wall) and the light hole (or through hole) will block most of the light, and only a small part of the light can be received by the receiving tube through the light hole, so the photocoupling efficiency is low

When the light hole accumulates dust due to static electricity, the detection sensitivity of the receiving tube (or photosensitive element) will drop sharply

In addition, because the emission angle of the emission tube is relatively large, and it is useless to use a collimator lens to narrow the beam angle, when the color of the inner wall of the button is white, or when the size of the shading plate is relatively small and the shading is not strict, the stray light generated by it is relatively large. Large, resulting in more obvious noise generated by the receiving tube

2. The IR tube (transmitting tube) and PT tube (receiving tube) of the optical axis mechanical keyboard switch module structure have in-line soldering pins, which need to be inserted into the PCB (printed circuit board) manually, and then soldered and Cutting feet, the plug-in deviation phenomenon is easy to occur in the welding production process, resulting in rework and maintenance procedures, the production operation process is cumbersome, not suitable for automatic plug-in production, high labor occupation, high part cost, low production efficiency and high manufacturing cost

3. The key cap character lighting system of this purely mechanical axis switch structure uses in-line LEDs, which also requires a lot of manual insertion to the PCB, and then welding and cutting. The production operation process is cumbersome, not suitable for automatic plug-in production, and the material cost High, low production efficiency and high manufacturing cost

4. Although the keyboard has a long life, but the waterproof ability is poor, you need to be more careful when using it

5. The key feel of the optical axis keyboard is single

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