Title:
ECCENTRICITY MEASUREMENT METHOD, LENS MANUFACTURING METHOD, AND ECCENTRICITY MEASUREMENT DEVICE
Document Type and Number:
Japanese Patent JP2021001747
Kind Code:
A
Abstract:
To provide an eccentricity measurement method for measuring the eccentricity between surfaces of a lens with high accuracy and at high speed, a lens manufacturing method, and an eccentricity measurement device.SOLUTION: Provided is an eccentricity measurement method for measuring the eccentricity of a lens having a first surface which is an aspherical surface symmetrical with respect to a first axis and a second surface which is an aspherical surface symmetrical with respect to a second axis. The measurement method includes a first step S2 for acquiring inclination of the first surface with respect to the second axis by using first reflected light reflected by the lens, a second step S1 for acquiring inclination of the second surface with respect to the first axis by using second reflected light reflected by the lens, and a third step S3 for acquiring the eccentricity by using the inclination obtained in the first step, the inclination obtained in the second step, a curvature of the first surface, a curvature of the second surface, and a distance between the first surface and the second surface.SELECTED DRAWING: Figure 7
Inventors:
MAEDA ATSUSHI
MIYASATO KENICHI
MIYASATO KENICHI
Application Number:
JP2019114377A
Publication Date:
January 07, 2021
Filing Date:
June 20, 2019
Export Citation:
Assignee:
CANON KK
International Classes:
G01B11/00; G01M11/00; G02B3/00
Attorney, Agent or Firm:
Ryosuke Fujimoto
Atsushi Mizumoto
Hirayama Tomoya
Atsushi Mizumoto
Hirayama Tomoya