Document reading apparatus, document reading method, and...

Details Document reading apparatus, document reading method, and... Document reading apparatus, document reading method, and...

2011-07-19

2011-07-19

Benson, Walter (Department: 2837)

Electricity: motive power systems

Positional servo systems

'reset' systems

C318S609000, C318S602000, C318S616000, C318S560000

Reexamination Certificate

active

07982424

ABSTRACT:
The invention provides, as an aspect thereof, an document reading apparatus that includes: a speed calculating unit that calculates a speed related to the rotation of a motor on the basis of a signal that is outputted from an encoder; and a controlling unit that calculates control amount on the basis of the speed calculated by the speed calculating unit so as to control the rotation of the motor in accordance with the calculated control amount. In the configuration of an document reading apparatus according to this aspect of the invention, the above-mentioned controlling unit controls the motor with an increase in the control amount in a case where there occurs no change in the signal that is outputted from the encoder for a certain period of time. The increase in the control amount is based on the length of time that has elapsed since the last change in the signal.

REFERENCES:
patent: 4623827 (1986-11-01), Ito
patent: 6037734 (2000-03-01), Toyomura
patent: 6812668 (2004-11-01), Akiyama
patent: 05-088752 (1993-04-01), None
patent: 06-067732 (1994-03-01), None
patent: 06-121576 (1994-04-01), None
patent: 06-237588 (1994-08-01), None
patent: 2001-251878 (2001-09-01), None
patent: 2003-204690 (2003-07-01), None

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