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Patent Searching and Data


Title:
SMALL VIEWING FIELD LENS
Document Type and Number:
WIPO Patent Application WO/2007/041904
Kind Code:
A1
Abstract:
A small viewing field lens is divided into a central visible area and a surrounding area, the dioptre of the central visible area is the normal dioptre obtained by optometry. The surrounding area includes a dioptre transition area and a surrounding blurring area, and visibility of a wearer is decreased by dioptre off-set, dioptre continuous variation, impurity addition and the like in the surrounding area. The central visible area is disposed at the center of the small viewing field lens, the surrounding blurring area is disposed at the periphery of the small viewing field lens, and the dioptre transition area is disposed at the area between the central visible area and the surrounding blurring area.

Inventors:
ZHANG DENGKE (CN)
Application Number:
PCT/CN2005/002297
Publication Date:
April 19, 2007
Filing Date:
December 23, 2005
Export Citation:
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Assignee:
ZHANG DENGKE (CN)
International Classes:
G02C7/02; G02C7/08
Domestic Patent References:
WO2005085937A12005-09-15
WO2003042746A12003-05-22
Foreign References:
CN2331982Y1999-08-04
CN88103410A1988-12-14
CN1249442A2000-04-05
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (Scitech Place N0.22, Jian Guo Men Wai Ave, Chao Yang District Beijing 4, CN)
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