Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2005-11-01
2005-11-01
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C359S426000
Reexamination Certificate
active
06960749
ABSTRACT:
An automatic focusing mechanism for mounting on a measuring device has a telescope for sighting a leveling rod with pattern marks marked thereon at an equal pitch between each mark, and a photoelectric device for converting an image sighted by the telescope into an electric signal to thereby automatically adjust a focus on the leveling rod. The mechanism is made up of: a stepping motor for moving a focusing lens of the telescope from one end toward an opposite end of a movable range of the focusing lens; a microcomputer for obtaining the pitch of the pattern marks of the leveling rod at that position on the photoelectric device which is capable of obtaining the pitch in a state before the focusing lens is focused on the leveling rod to obtain a distance to the leveling rod based on the pitch obtained by the microcomputer; and fine adjusting mechanism for moving the focusing lens to a position corresponding to the distance.
REFERENCES:
patent: 5742378 (1998-04-01), Kumagai et al.
Patent Abstracts of Japan: Inventor:Koji, et al., Jul. 23, 1993; “Pressurizing Device for Stress Cone”.
Arent & Fox PLLC
Luu Thanh X.
Sokkia Co. Ltd.
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