Optical axis keyboard adjusting method and optical axis keyboard applying same
An adjustment method and keyboard technology, applied in the field of keyboards, can solve problems such as reduced light intensity, luminous efficiency decline, and high-level range shortening
Pending Publication Date: 2021-08-06
HUAIAN DARFON ELECTRONICS +1
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Problems solved by technology
The relevant optical axis keyboard technology will therefore lead to the derivation of the light source after a long time of scanning and emitting light, the light source (such as infrared light emitting diode (infrared light emitting diode, IRLED)) luminous efficiency declines and the intensity of the emitted light is reduced; this leads to detection components. The high-level interval in the corresponding detection electrical signal becomes shorter or delayed, so that the control unit reads the detection electrical signal and obtains a wrong low voltage level, which in turn makes the control unit misjudge that the key unit has not been pressed.
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[0043] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are given in conjunction with the embodiments.
[0044] Please refer to figure 1 , figure 1 It is a schematic diagram of the circuit principle of an embodiment of the optical axis keyboard 100 of the present invention. A general optical axis keyboard may have, for example, more than 88 key units, more than 6 scan lines, and more than 18 read lines. In this way, 6 scan lines and 18 read lines form a keyboard scan matrix, and each key unit is respectively disposed at the intersection of one scan line and one read line. like figure 1 As shown, four key units 110_1 to 110_4, two scan lines and two read lines are used as examples for description, but not limited thereto. The key unit 110_1 is disposed at the intersection of the scan line 164_1 and the read line 166_1, the key unit 110_2 is disposed at the intersection o...
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The invention provides an optical axis keyboard adjusting method and an optical axis keyboard applying the adjusting method, the optical axis keyboard is provided with a plurality of key units, and the optical axis keyboard adjusting method comprises the following steps: a control unit transmits a scanning signal on one of a plurality of scanning lines at a first scanning time point; the light source emits light according to the scanning signal; the detection component detects the light to generate a detection electric signal; the control unit reads the detection electric signal to obtain a first read signal level; when the level of the first reading signal exceeds the pressing state level range of the key unit, the control unit enables the time period length of the scanning signal to be lengthened by a first preset amount so as to obtain a corrected scanning signal. According to the invention, the control unit can read the accurate voltage level, so that the control unit can accurately judge whether the key unit is pressed or not.
Description
technical field [0001] The invention relates to the field of keyboards, in particular to an optical axis keyboard adjustment method and an optical axis keyboard applying the adjustment method. Background technique [0002] Since the optical axis keyboard uses light generated by light sources (such as light-emitting diodes) and corresponding detection components (such as phototransistors) to operate, the optical axis keyboard control unit needs to periodically and sequentially transmit scan signals on multiple scan lines to Turn on the light source to emit light, so that the detection component can determine whether a key is pressed according to whether the light is received. The related optical axis keyboard technology will therefore result in that after the light source scans and emits light for a long time, the luminous efficacy of the light source (such as infrared light emitting diode (IRLED)) will decline and the intensity of the emitted light will decrease. The high l...
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Login to View More IPC IPC(8): H03K17/969
CPCH03K17/969
Inventor 李建兴
Owner HUAIAN DARFON ELECTRONICS