CFRP-made optical cylinder

Details CFRP-made optical cylinder CFRP-made optical cylinder

1993-10-18

1995-01-17

Ben, Loha

Optical: systems and elements

Optical aperture or tube, or transparent closure

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

Patent

active

053830628

ABSTRACT:
The present invention provides a CFRP-made optical cylinder comprising, as the main CFRP layers, (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 making an angle of substantially.+-.(40.about.50) degree to the cylinder axial direction, in which cylinder at least 50% by weight of the carbon fiber arranged in a direction substantially parallel to the cylinder axial direction has a linear expansion coefficient of -1.times.10.sup.-6 /.degree.C. or less and at least 50% by weight of the carbon fiber arranged in a direction making all angle of substantially.+-.(40.about.50) degree to the cylinder axial direction has a linear expansion coefficient of -1.times.10.sup.-6 /.degree.C. or less, and which cylinder has a linear expansion coefficient of -0.5.times.10.sup.-6 /.degree.C. to 0.5.times.10.sup.-6 /.degree.C. in the axial direction. In the present optical cylinder, the influence by the change in atmospheric temperature is very small. Further, in the production of the present optical cylinder, it has no distortion when subjected to heating and subsequent cooling to room temperature for molding, because it is well balanced in rigidity and strength.

REFERENCES:
patent: 4601928 (1986-07-01), Van Der Velden
patent: 4702885 (1987-10-01), Odani et al.
patent: 4707206 (1987-11-01), Trepus et al.
patent: 4950064 (1990-08-01), Akin
patent: 5038834 (1991-08-01), Siegfried
patent: 5052444 (1991-10-01), Messerly
patent: 5191486 (1993-03-01), Sato et al.

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