Low power consumption encoder, control method therefor and coordinate input device using the same
AssigneeFujitsu Takamisawa Component Limited
InventorKazuhiro Watanabe
Life of this patent
Estimating the term…
Abstract
An encoder having a light emitting device and a photo IC for receiving light emitted from the light emitting device. The encoder includes a driving unit having a first driving power output terminal, to which one of a pair of power supply terminals of the photo IC is connected, for outputting driving power. The driving power is used for intermittently driving the photo IC only for a desired time period.
Claims19
An encoder used with a light emitting device and a photo IC for receiving light emitted from said light emitting device, said encoder comprising:
- a driving unit having a first driving power output terminal, to which one of a pair of power supply terminals of said photo IC is connected, for outputting driving power to be used for intermittently driving said photo IC only for a desired time period.
A coordinate input device comprising:
- an encoder comprising a light emitting device and a photo IC for receiving light emitted from said light emitting device;
- a driving unit comprising a first driving power output terminal, to which one of a pair of power supply terminals of said photo IC is connected, for outputting driving power to be used for intermittently driving said photo IC only for a desired time period;
- and
- a slitted disk comprising a plurality of slits formed along a circumference of the disk at uniform intervals,
- wherein coordinate input data, which is to be inputted to a computer, is generated according to slitted-disk rotation information.
A control method of controlling an encoder having a light emitting device and a photo IC for receiving light from said light emitting device, wherein electric power for intermittently driving said photo IC for a desired time period is outputted from a first driving power output terminal to which one of a pair of power supply terminals of the photo IC is connected.
An apparatus, comprising:
- a light emitting device emitting light;
- a driving unit intermittently driving a photo IC which receives the light;
- and
- a rotatable disk between the light emitting device and the photo IC, the disk comprising slits alternately blocking passage of the light,
- wherein data regarding the received light is output from the photo IC and is used to determine coordinate information.
A method, comprising:
- emitting light;
- driving intermittently a photo IC which receives the light;
- rotating a disk between the light emitting device and the photo IC, the disk comprising slits alternately blocking passage of the light;
- and
- determining coordinate information based on data regarding the received light from the photo IC.
An apparatus, comprising:
- light emitting means emitting light;
- driving means intermittently driving a photo IC which receives the light;
- and
- rotating disk means between the light emitting device and the photo IC,
- wherein data regarding the received light is output from the photo IC and is used to determine coordinate information.
Dependencies are inferred from the claim text.