Position detection device and optical apparatus

Details Position detection device and optical apparatus Position detection device and optical apparatus

2006-10-25

2011-10-18

Ledynh, Bot (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207260

Reexamination Certificate

active

08040126

ABSTRACT:
A position detection device includes a magnetic generation unit that has: a first magnetism generating section that is provided on one end side along a predetermined direction and generates magnetism; a second magnetism generating section that is provided on another end side along the predetermined direction and generates magnetism of polarity different from that of the first magnetism generating section; and a low magnetism section that is formed in the first magnetism generating section and the second magnetism generating section such that a width of the low magnetism section varies along the predetermined direction to generate magnetism lower than those of the first magnetism generating section and the second magnetism generating section, and a magnetic detection unit that is capable of moving relative to the magnetic generation unit along the predetermined direction and that detects the magnetism generated by the first magnetism generating section and the second magnetism generating section.

REFERENCES:
patent: 6018241 (2000-01-01), White et al.
patent: 7088095 (2006-08-01), Busch
patent: 2005/0134257 (2005-06-01), Etherington et al.
patent: 02-138820 (1990-05-01), None
patent: 2000-155005 (2000-06-01), None
patent: 2001-59745 (2001-03-01), None
patent: 2002-229090 (2002-08-01), None
patent: 2006-250857 (2006-09-01), None

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