Optical instrument

Details Optical instrument Optical instrument

1990-03-27

1992-12-22

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

354402, 358227, G02B 1514

Patent

active

051738074

ABSTRACT:
This specification discloses an optical instrument comprising a focusing lens, a zooming lens, first detecting means for detecting the focus state of the focusing lens, and control means for moving the zooming lens in conformity with the output of the first detecting means and making the size of an object which is occupied in the picture plane substantially constant, the control means varying the movement speed of the zooming lens in conformity with the output of the first detecting means. The specification also discloses an optical instrument comprising a focusing lens, a zooming lens, first detecting means for detecting the focus state of the focusing lens, second detecting means for detecting the magnification change state of the zooming lens, and control means for moving the zooming lens in conformity with the relative position information of the two lenses based on the outputs of the first detecting means and the second detecting means and making the size of an object which is occupied in the picture plane substantially constant, the control means varying the conditions for the start of the movement of the zooming lens in conformity with the output of the first detecting means.

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patent: 5092670 (1992-03-01), Preston
patent: 5113214 (1992-05-01), Nagata et al.
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