A switch module for controlling and adjusting photoelectric signals for input devices

Abstract

A switch module for controlling and adjusting a photoelectric signal to be input into a device. The switch module uses an SMD IR tube (17) and an SMD PT tube (18) as an optical signal transmitting and receiving apparatus. A light guide tube or a structure of an optical fibre combined with a switch optical control component is used for realizing the switching-off and -on of a light path of a photoelectric switch and the precise control of intensity of the photoelectric signal. The switch optical control components of a photoelectric light guide switch module are a prism (141), a freely curved surface lens and a light gate which are in linkage with a shaft key (14). The photoelectric light guide switch module can realize the switching-off and -on of a light path of the photoelectric switch by moving a position of the switch control component relative to the light guide tube or the optical fibre, and can also realize the linear relationship control of the photoelectric signal, changing from weak to strong or from strong to weak.

Description

technical field [0001] The invention relates to a photoelectric light-conducting mechanical shaft keyboard switch and a photoelectric light-conducting game mouse key switch, in particular to a photoelectric light-conducting switch module for controlling and adjusting photoelectric signals for inputting equipment. Background technique [0002] The photoelectric keyboard is a new technology in recent years. It adopts a new photoelectric induction recognition technology, replaces the traditional metal contact shrapnel with an optical induction component, and improves some problems that the traditional contact mechanical switch is easy to wear and damage. It uses the optical principle and photoelectric coupling technology to form a light path between the light-emitting element and the photoelectric sensor. The switch component triggers the photoelectric sensor during the cutting and closing of the optical path, and changes the circuit impedance value to complete the high and low ...

AI Technical Summary

Problems solved by technology

[0004] But at present existing optical fiber type photoelectric keyboard all has the following disadvantages: 1. The transmitting optical fiber and the receiving optical fiber arranged below the support plate 3 are not provided with light collimating and concentrating systems of condensing lenses, because the light angle of the end face of the optical fiber is relatively large (In general, multimode fiber NA, that is, the range of numerical aperture is generally between 0.18-0.23), and the transmitting fiber and receiving fiber are respectively located on both sides of the T-shaped key shaft, and there is at least one gap between the transmitting end and the receiving end. The gap of the size of the key shaft blocks or guides the light path through the up and down movement of the key shaft. Since the thickness of the key shaft generally needs to be at least 1 mm or more, this leads to a relatively low optical coupling efficiency from the transmitting fiber to the receiving fiber. There is only one Only a small part of the light from the transmitting fiber can be coupled into the receiving fiber

2. More than two buttons are connected in series, and which button is pressed is determined by XY addressing, which will cause a problem: due to the optical coupling loss between the transmitting fiber and the receiving fiber under each button It is relatively large, and several button groups on the same optical path are connected vertically and horizontally at the same time. This structure will make the signal of the button near the end of the line relatively weak, resulting in a decrease in the sensitivity of the button at the end of the line, and prone to false touches.

3. The elastic filling material is easy to age after long-term use, resulting in elastic failure, and the key rebound is laggy and astringent, resulting in a decrease in the sensitivity of the key

4. Compared with the mechanical spring, the bounce speed of the elastic filling material is slower, there is no drop feeling, its rebound force is small, the switching action is slow, insensitive, and the hand feel is not good, so it is not suitable for computer game keyboards

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