US 9,869,839 B2Granted

Optical element holding structure, camera filter frame, camera filter unit, and imaging lens

AssigneeKabushiki Kaisha Tsuso

InventorHideo Kobayashi

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Abstract

A camera filter unit (1) includes an optical filter (2), a filter holding ring (3), and a filter frame (4) that are coaxially disposed in this order from the inside to the outside. The optical filter (2) has a tapered annular chamfered surface (13) on an outer peripheral edge of a rear filter surface (12). The filter holding ring (3) includes a front stopper (21) that is abuttable on the optical filter (2) from a front (X1) and a rear stopper (22) that extends along the annular chamfered surface (13). The filter frame (4) includes a second rear stopper (32) that prevents the optical filter (2) from moving to a rear (X2). The optical filter (2) is held by the filter holding ring (3) in a rotatable manner about an axis L. The optical filter (2) is fixed in a relatively unrotatable manner by the second rear stopper (32) abutting on the rear filter surface (12).

Claims7

Dependent claims

An optical element holding structure comprising:

a cylindrical body into which an optical element is inserted coaxially on an inner peripheral side;
a frame body which holds the cylindrical body on the inner peripheral side;
a front stopper, which is disposed on the cylindrical body and is abuttable on an outer peripheral edge of a front surface of the optical element from a front in an axial direction;
and
a rear stopper which is disposed on the frame body and is abuttable on an outer peripheral edge of a rear surface of the optical element from a rear in the axial direction,
wherein
the rear end of the cylindrical body abuts on the rear stopper from the front, and
the cylindrical body and the frame body hold the optical element between the front stopper and the rear stopper in a rotatable manner about an axis, and
when the optical element is caused to abut on one of the front stopper and the rear stopper, a clearance is formed between the optical element and the other of the front stopper and the rear stopper.

6 more elements

Dependencies are inferred from the claim text.