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Title:
SPECTACLES
Document Type and Number:
Japanese Patent JP2009294654
Kind Code:
A
Abstract:

To provide spectacles never seen before, having multi-focal point or continuously varying the focal point using the technology of a liquid crystal lens.

The spectacles include a frame. Inside the frame, a lens group is provided. The lens group includes a liquid crystal lens and a concave lens 150 with a negative power. The liquid crystal lens is adapted to vary the power from 0 toward the positive by controlling the voltage application of a power supply circuit. The power supply circuit is controlled by a control circuit. The spectacles include a ranging mechanism for measuring a distance to an object observed at that time by a user. The control circuit controls the power supply circuit according to the distance to the object measured by the ranging mechanism, and the power supply circuit changes a potential difference applied to the liquid crystal lens. The resultant power of the lens group ranges from the positive to the negative.


Inventors:
YAMAMOTO MASAO
Application Number:
JP2009113960A
Publication Date:
December 17, 2009
Filing Date:
May 08, 2009
Export Citation:
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Assignee:
SCALAR CORP
International Classes:
G02F1/13; G02B3/14; G02C7/02; G02C7/10; G02F1/133
Domestic Patent References:
JPH1164817A1999-03-05
JP2006302462A2006-11-02
JP2008519317A2008-06-05
Foreign References:
WO2007098602A12007-09-07
Attorney, Agent or Firm:
Yoshito Muramatsu
Masatake Suzuki



 
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