Temperature compensation device for optical instruments

Details Temperature compensation device for optical instruments Temperature compensation device for optical instruments

2006-07-04

2006-07-04

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With support

C359S819000, C359S821000, C359S822000

Reexamination Certificate

active

07072126

ABSTRACT:
The present invention discloses a temperature compensation device for optical instruments which comprises a lens assembly, motor means for rotating the lens assembly about the optical axis thereof, kinematic means for producing rectilinear motion of the lens assembly in response to the rotary motion of the lens assembly, and means for determining the linear displacement and therefore the actual linear position of the lens assembly. Additionally, the device comprises thermometric means, e.g. a temperature detector, which measures the temperature of the environment and transmits the temperature to a processor which controls the actual linear position of the lens assembly through an electronic circuit. The relationship between the temperature detector reading and the corresponding desired linear position is defined by memorized means, preferably by a LUT (look-up table) or, e.g., through optimization on a sensor (ccd, IR, etc.) output (picture). At all times, the desired linear position, corresponding to the temperature detector reading, is compared to the actual linear position, and, if there is a difference, the aforesaid kinematic means is actuated by appropriate means to displace the lens assembly to the desired linear position.

REFERENCES:
patent: 2002/0036835 (2002-03-01), Nomura et al.
patent: 2003/0099053 (2003-05-01), Yoshikawa
patent: 2004/0050694 (2004-03-01), Yang et al.

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