Title:
LENS BARREL
Document Type and Number:
Japanese Patent JP2015021999
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To suppress an alignment position of a marginal contact aligned so as to align an optical axis, and further an optical element held by a pressure ring from varying because holding of the pressure ring does not function due to expansion of a barrel with respect to the optical element under a high temperature environment.SOLUTION: Between edge surfaces of optical element rings to be abutted at a marginal contact, an elastic ring-like member, of which a dimension is set to resist abutting of the marginal contact, is arranged and is pressed by the pressure ring to thereby cause marginal contact. When a barrel expands under a high temperature environment and an air gap is about to generate between the pressure ring and the optical element, urging force of a ring-like elastic member pushes the optical element to an abutting joint surface and thereby holds an alignment position.
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Inventors:
SUGITA JUN
Application Number:
JP2013147665A
Publication Date:
February 02, 2015
Filing Date:
July 16, 2013
Export Citation:
Assignee:
CANON KK
International Classes:
G02B7/02
Attorney, Agent or Firm:
Yukio Takanashi