Input apparatus having electrostatic sensor
View Patent ↗An input apparatus having a reduced-size electrostatic sensor that can precisely detect an input and then output a signal and, thus, has excellent responsiveness and reliability contains the following: clock signal generating means for generating clock signals; delaying means for generating delayed signals by delaying the signal rise time of the clock signal according to the capacitance detected when a human appendage approaches or contacts the electrostatic sensor; AND means for receiving the clock signal and the delayed signal as input signals and then outputting these signals as an output signal; and smoothing means for smoothing and outputting the output of the analog switch.
1. An input apparatus having an electrostatic sensor, comprising:
clock signal generating means for generating clock signals;
delaying means for generating delayed signals by delaying signal rise times of the clock signals according to a capacitance detected when a human appendage approaches or contacts the electrostatic sensor;
AND means for receiving the clock signals and the delayed signals as input signals and outputting the clock and delayed signals as an output signal; and
smoothing means for smoothing and outputting an output of the AND means,
wherein the delaying means extends a pulse length of a first clock signal generated at the clock signal generating means to a length required for obtaining an intended output from the smoothing means when the electrostatic sensor is started up by the human appendage contacting the electrostatic sensor in a standby mode with no clock signal output.
2. An input apparatus having an electrostatic sensor, comprising:
clock signal generating means for generating clock signals;
delaying means for generating delayed signals by delaying signal rise times of the clock signals according to a capacitance detected when a human appendage approaches or contacts the electrostatic sensor;
AND means for receiving the clock signals and the delayed signals as input signals and then outputting the clock and delayed signals as an output signal;
an analog switch for switching and outputting an output of the AND means with a clock signal; and
smoothing means for smoothing and outputting an output of the analog switch,
wherein the delaying means extends a pulse length of a first clock signal generated at the clock signal generating means to a length required for obtaining an intended output from the smoothing means when the electrostatic sensor is started up by the human appendage contacting the electrostatic sensor in a standby mode with no clock signal output.