Patent
1988-06-13
1989-07-25
Bovernick, Rodney B.
G02B 702
Patent
active
048506745
ABSTRACT:
An optical lens is kept in a desired position in a lens holder by a means. The back of the lens engages against a fixed abutment and the means has a tubular keeper which is threaded into the holder. The keeper is divided by slits into deflectable supports. These are kept in engagement against the peripheral surface of the lens by a ring which is a part of the means. The thickness (t) and width (b) of the supports are selected such that they are practically stiff in a tangential direction and yielding in a radial direction. To have low weight, the holder (1) and keeper (5) are of aluminum. The lens (2) is of glass and the ring (9) of titanium, the coefficient of linear expansion of which agrees closely with that of the glass. For temperature variations, the holder (1) and keeper (5) will be subjected to relatively large change in length, while the ring (9) keeps the engagement surfaces (10) of the supports (7) in engagement against the peripheral surface (8) of the lens (2 ). A diametrically opposed pair of the supports (7) then keeps the optical axis (C) of the lens in its position in the holder (1) in the tangential direction of the supports.
REFERENCES:
patent: 3671108 (1972-06-01), Kilgus
patent: 4506951 (1985-03-01), Yamada
Ben Loha
Bovernick Rodney B.
Telefonaktiebolaget L M Ericsson
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