Imaging device containing an electrooptic material to adjust the

Details Imaging device containing an electrooptic material to adjust the Imaging device containing an electrooptic material to adjust the

1994-07-11

1995-09-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250216, 359 94, H01J 314, H01J 516, H01J 4014

Patent

active

054517664

ABSTRACT:
A first substrate (2) carries an array (3) of imaging elements (4). An array (5) of lens elements (6) is provided with each lens element (6) associated with at least one imaging element (4) for concentrating light (L) travelling on a light path between the imaging element (4) and the at least one lens element (6). An electro-optic material (8) having an electrically alterable refractive index is provided in a space defined between a second substrate (7) and one of the imaging element and the lens element arrays (3 and 5). Electrodes (8a,8b) are provided for applying an electrical potential across the electro-optic material (8) to adjust the effective focal length of the lens elements (6). The focal length of the lens elements (6) can thus be adjusted by applying or varying the potential applied across the electro-optic material so that the focus of the imaging device is not entirely dependent on the nature and construction of the lens elements (6 ).

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"Microlens Arrays" M. Hutley et al., Physics World, Jul. 1991, pp. 27-32.

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