Frequency optical-mode matrix inputting module

Abstract

The invention comprises: an input circuit controller, a case and an elastic body. It features the following: one or more light output end are respectively pointed to the light splitter of receiver; when there are spectrometric light paths formed; the light splitter, key reflection plane corresponding to the transmitter, and multi photoelectric switch circuits containing the receiver composes the output key code of the optical encoder. The manufacture cost of the invention is equal to the traditional keyboard; the photoelectric switch circuit, the transmitter and main control chip can be set up on same PCB. It can be used in computer keyboard, IC card phone keyboard, cashomat keyboard, remote controller keyboard, and film switch.

Description

technical field [0001] The invention relates to a frequency optical code matrix input module, which is an optical encoder composed of a splitter and a plurality of photoelectric conversion circuits containing receivers when the key is pressed, and the reflective surface of the key reflects the line light signal to the optical encoder. The encoder outputs the splitter photoelectric switch circuit of the key code. technical background [0002] Referring to the known key reflective photoelectric switch circuit in Figure 11, when the key is pressed, the key reflective surface directly reflects the optical signals of different frequencies sent by the row optical signal transmitter to the column receiver. In order to distinguish the key codes of each key, each column There must be a set of column receivers with photoelectric conversion circuits directly corresponding to the key reflective surface. Taking a computer keyboard as an example, it has 6 rows and 21 columns in total. Thi...

AI Technical Summary

Problems solved by technology

[0002] Referring to the known key reflective photoelectric switch circuit in Figure 11, when the key is pressed, the key reflective surface directly reflects the optical signals of different frequencies sent by the row optical signal transmitter to the column receiver. In order to distinguish the key codes of each key, each column There must be a set of column receivers with photoelectric conversion circuits directly corresponding to the key reflective surface. Taking a computer keyboard as an example, it has 6 rows and 21 columns in total. This solution requires a total of 21 column receivers (including 21 sets of photoelectric conversion circuits) and The key reflective surface of the key corresponds directly. This technical solution needs to arrange 21 sets of photoelectric conversion circuits in the length direction of the keyboard, so that 21 receiving tubes correspond to each column of keys (only 6 columns of keys are shown in Figure 11), and only 21 sets of columns are fixed. The printed board required by the receiver is about 400mm long. This technical solution requires a large number of components, a large circuit and a complex structure, high production costs, difficult to take waterproof measures, and difficult to organize mass production. The production cost is lower than that of traditional contact films. Several times of the keyboard has seriously affected the promotion and use of photoelectric keyboards

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