The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 1991
Filed:
Apr. 30, 1990
Noriyuki Nose, Kawasaki, JP;
Yukichi Niwa, Narashino, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A three-dimensional shape measuring apparatus having a high performance and a reduced drive energy is disclosed. At least a portion of an in-focus state detection optical system having an internal light source is movable while maintaining a light path near an object lens of the optical system. A distance of movement of the movable portion which is moved with auto-focusing operation for an object is measured and the three-dimensional shape is measured precisely with a high stroke. An inclination angle measuring optical system which shares the light path near the object lens with the in-focus state detection optical system and has an internal light source is provided in a common casing. Thus, the distance of movement of the movable part of the in-focus state detection optical system and an inclination angle are simultaneously measured so that the three-dimensional shape can be more precisely measured.