Multi-beam scanner

Details Multi-beam scanner Multi-beam scanner

2005-04-19

2005-04-19

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C347S235000, C347S237000, C250S235000

Reexamination Certificate

active

06882454

ABSTRACT:
While scanning two laser beams that are separated by a prescribed distance d in the scanning direction, one of the beams is first irradiated onto a BD sensor at a timing t11. However, the sensor signal Vs emitted from the BD sensor changes only slightly at this time, and the amplified sensor signal Vg, which is a reverse amplification of the sensor signal Vs, does not reach the threshold level Vth. Subsequently, at a timing t12 the other laser beam is irradiated onto the BD sensor so that both laser beams are simultaneously irradiated on the BD sensor. At this time, the amplified sensor signal Vg rises enough to exceed the threshold level Vth, and the BD signal is outputted (switched to low level). By outputting a BD signal upon simultaneously receiving two laser beams in this way, stability of the BD signal is improved.

REFERENCES:
patent: 6163333 (2000-12-01), Kamioka
patent: 6466247 (2002-10-01), Sugano et al.
patent: A 2003-25626 (2003-01-01), None

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