Input module for key encoder

Abstract

A key encoder input module for keyboard which transmitting signal with light, and the cost of manufacture is low. The key encoder input module includes circuit controller, keycap which setup on casingand connected with elastomer, multiple signal emitters and receivers. The key encoder input module also includes a light splitter, a key optical switch is set under the keycap, signal sent by the signal emitter corresponds to the light input port of the light splitters through key light switch, a light encoder is formed between the light splitters and receivers by connecting them with the light path of the light splitters. When a keycap is pressed, signal emitter conducts with the light path of receiver and forms light splitting path after passing the key light switch and light splitter whichperforming permutation and combination to light path, and light encoder outputs a set of key code signal corresponding to the key position of the keycaps to the input circuit controller. The key encoder input module has the advantages of that the configuration is simple, the cost is basically equal to the traditional keyboard, and the number of photocells used is small. For example, the computerkeyboard usually needs a phototranslating circuit with 5 sets of receivers, and produces 2<5>key codes, namely 32 sets of key codes. And the receiver does not need to directly correspond to light switch of keys in rows. The phototranslating circuit including receivers may be set on the same printed plate with emitters and main control chip. The key encoder input module has the advantages that theconfiguration of circuit is tight and simple, the cost of production is low, and it is easy to organize batch production. It is convenient to take steps to pressurize a bit of printed plate, so that the keyboard is wholly rainproof, even may be used in water.

Description

Technical field [0001] The invention relates to a signal transmission module for a keyboard, in particular to an input module using light for signal transmission. Background technique [0002] Existing key encoder input modules such as Figure 11 As shown, the key reflective photoelectric switch circuit is used. When the key is pressed, the key reflective surface reflects the different frequency signals sent by the row signal transmitter to the column receiver, and then processed by the input circuit controller to obtain a key of each position. Corresponding key code signal. In order to distinguish the key codes of each key, each column must have a set of column receivers with photoelectric conversion circuits directly corresponding to the key reflective surface. Taking a computer keyboard as an example, in the case of a total of 6 rows and 21 columns, the solution requires a total of The 21 column receivers (including 21 sets of photoelectric conversion circuits) correspon...

AI Technical Summary

Problems solved by technology

In order to distinguish the key codes of each key, each column must have a set of column receivers with photoelectric conversion circuits directly corresponding to the key reflective surface. Taking a computer keyboard as an example, in the case of a total of 6 rows and 21 columns, the solution requires a total of The 21 column receivers (including 21 sets of photoelectric conversion circuits) correspond to the key reflective surfaces of the keys. This technical solution only needs to fix 21 sets of column receivers. The solution requires a large number of components, large circuits and complex structures, high production costs, difficult to take waterproof measures, and difficult to organize mass production. The production cost is several times that of traditional keyboards, which seriously affects the promotion and use of photoelectric keyboards.

Images