Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2005-05-10
2005-05-10
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C356S624000, C359S426000
Reexamination Certificate
active
06891141
ABSTRACT:
A surveying instrument includes a sighting telescope optical system, a distance measuring system which outputs first data, a phase detection autofocus system which and outputs second data, and an AF driver which moves a focusing lens of the sighting telescope optical system to bring the sighting object into focus in accordance with one of the first data and the second data. A surveying instrument is also disclosed, which includes a sighting telescope and an AF drive unit which is provided separately from the sighting telescope, wherein the AF drive unit can be mounted to and dismounted from a body of the surveying instrument.
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Hoshino Tadahisa
Kaneko Kenji
Suzuki Shin'ichi
Takayama Homu
Ueno Masayuki
Greenblum & Bernstein P.L.C.
Luu Thanh X.
PENTAX Corporation
Sohn Seung C.
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