Image reading apparatus using a plurality of phase excitation mo

Details Image reading apparatus using a plurality of phase excitation mo Image reading apparatus using a plurality of phase excitation mo

1990-12-13

1992-10-20

Grimley, A. T.

Facsimile and static presentation processing

Facsimile

Synchronization

318696, 355 56, 355243, 358451, H04N 136

Patent

active

051575159

ABSTRACT:
An image reading apparatus includes a reading unit for reading the image and a stepping motor for moving the reading unit. The stepping motor is excited and driven in one of a plurality of phase excitation modes each causing a different amount of movement per unit synchronizing signal. A phase excitation mode is selected from the plurality of phase excitation modes corresponding to an enlargement or reduction ratio of the image to alter the moving speed of the reading unit corresponding to the rotation speed of the stepping motor.

REFERENCES:
patent: 4476421 (1984-10-01), Moriguchi
patent: 4490664 (1984-12-01), Moriguchi
patent: 4540927 (1985-09-01), Tanimoto
patent: 4555653 (1985-11-01), Nawata et al.
patent: 4642544 (1987-02-01), Furumura et al.
patent: 4917460 (1990-04-01), Yamada et al.

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