Liquid crystal eyeglass
AssigneeOlympus Optical Co., Ltd.
InventorsTakao Okada, Takeaki Nakamura, Kazuo Nakamura, Kimihiko Nishioka, Toshihito Kouchi, Hiroyuki Yamamoto, Hideo Tomabechi
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Abstract
Liquid crystal eyeglasses include a detector for detecting a physical quantity which varies with the temperature of the liquid crystal, the orientation of molecules of the liquid crystal or a change in the refractive index of the liquid crystal. The voltage applied to the liquid crystal is controlled in accordance with an output signal from the detector, thus compensating for a change in the refractive index of the liquid crystal which is attributable to a temperature change and maintaining the refractive index constant.
Claims14
A liquid crystal eyeglass including:
- a frame;
- a liquid crystal mounted on said frame and having control electrodes and exhibiting a varying refractive index as a result of a change in the orientation of molecules of the liquid crystal in response to the application of an external voltage from a source mounted on said frame and coupled to said control electrodes;
- means for detecting a physical quantity which varies with a change in the orientation of molecules of the liquid crystal;
- voltage control means for controlling the voltage applied to the liquid crystal in response to a detection output from the detecting means, thereby allowing a compensation of a change in the refractive index of the liquid crystal which occurs in response to a temperature change;
- pulse generator means;
- analogue switch means for alternately coupling said detecting means and said voltage control means to said liquid crystal at a repetition rate determined by said pulse generator means, whereby said liquid crystal is alternately powered and monitored in a continuing, repetitive manner.
Dependencies are inferred from the claim text.