Imaging apparatus having electrooptic devices comprising a varia

Details Imaging apparatus having electrooptic devices comprising a varia Imaging apparatus having electrooptic devices comprising a varia

1991-11-04

1992-09-22

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 73, 359 74, 359 84, 359 94, 359 41, G02F 113

Patent

active

051502348

ABSTRACT:
An imaging apparatus is provided with a negative lens, a variable focussing lens unit including a material with an electrooptic effect, a light blocking unit, including the material with the electrooptic effect, capable of changing an aperture diameter, and a switch, interlocked with each other, capable of supplying electric power to the variable focussing lens unit and the light blocking unit which are arranged in order on an optical axis from an object side to an image side. When the switch is turned off, the variable focussing lens unit is set to bring an object at a far point into focus and the light blocking unit is set so that an aperture is determined by an aperture stop, while on the other hand, when the swtich is turned on, the variable focussing lens unit is set so that an object at a near point is in focus and the light blocking unit is set to be smaller in aperture. Apertures different in size are determined by a plurality of annular transparent electrodes incorporated in the light blocking unit and configured concentrically. Thus the imaging apparatus can be constructed to be small or compact in size and is easy in manufacturing.

REFERENCES:
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patent: 4190330 (1980-02-01), Berreman
patent: 4394069 (1983-07-01), Kaye
patent: 4601545 (1986-07-01), Kern
patent: 4904063 (1990-02-01), Okada et al.
patent: 4927241 (1990-05-01), Kuijk
patent: 5071229 (1991-12-01), Oaki et al.

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