CFRP-made optical cylinder

Details CFRP-made optical cylinder CFRP-made optical cylinder

1992-03-30

1993-03-02

Ben, Loha

Optical: systems and elements

Optical aperture or tube, or transparent closure

156184, 156187, 138125, 138177, 419 24, G02B 500

Patent

active

051914867

ABSTRACT:
The present invention provides a CFRP-made optical cylinder comprising (a) CFRP layers containing a carbon fiber arranged in a direction substantially parallel to the cylinder axial direction and (b) CFRP layers containing a carbon fiber arranged in a direction nearly orthogonal to the cylinder axial direction, in which cylinder the carbon fiber arranged in a direction substantially parallel to the cylinder axial direction has a minus thermal expansion coefficient and the cylinder axial direction has a thermal expansion coefficient of -0.5.times.10.sup.-6 /.degree.C. to 0.5.times.10.sup.-6 /.degree.C. In the present optical cylinder, a sharp image can be maintained without making the correction of the optical axis even when the atmospheric temperature changes largely.

REFERENCES:
patent: 4601928 (1986-07-01), van der Velden
patent: 4702885 (1987-10-01), Odani et al.
patent: 4707206 (1987-11-01), Trepus, Jr. et al.
patent: 4950064 (1990-08-01), Akin, Jr.
patent: 5038834 (1991-08-01), Siegfried
patent: 5052444 (1991-10-01), Messerly et al.

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