Title:
PRECURSOR LENS FOR EYEGLASSES WITH MINUS STRENGTH, EYEGLASSES' LENS, AND PROCESSING METHOD OF PRECURSOR LENS FOR EYEGLASSES WITH MINUS STRENGTH
Document Type and Number:
Japanese Patent JP2020034887
Kind Code:
A
Abstract:
To provide a precursor lens for eyeglasses with minus strength in which a feeling of strangeness is small with respect to vision when seen from a third person and processing steps are a few, and to provide eyeglasses' lens having the precursor lens processed, and to provide a processing method of the precursor lens for eyeglasses with the minus strength.SOLUTION: A precursor lens for eyeglasses with minus strength is configured to synthesize: a concave surface shape (a first shape) in which a spherical shape 14 with a lateral direction longer than a vertical direction is set on a lens rear surface side of a material block 12, and an optical performance can be exerted as a lens with minus strength prescribed for a wearer with respect to the lens rear surface; and a shape in which a boundary line 13 with the first shape on an inner side of at least one of a nose side and an ear side of the spherical shape 14 and on an outer side than a lens use area in the spherical shape 14 is arranged and a thickness is gradually thinner toward a circumference of the material block 12 from the boundary line 13.SELECTED DRAWING: Figure 1
Inventors:
MIURA HITOSHI
FUJII TERUAKI
FUJII TERUAKI
Application Number:
JP2019025154A
Publication Date:
March 05, 2020
Filing Date:
February 15, 2019
Export Citation:
Assignee:
TOKAI KOGAKU KK
International Classes:
G02C13/00; B23B5/36; B24B13/00
Domestic Patent References:
| JP2009103795A | 2009-05-14 | |||
| JP2016057324A | 2016-04-21 |
Foreign References:
| WO2010001662A1 | 2010-01-07 |
Attorney, Agent or Firm:
Junichi Shibata