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US 4,544,240 AGranted
Soft focusing lens assembly
AssigneeCanon Kabushiki Kaisha
InventorSeiichi Shimizu
Life of this patent
Estimating the term…
Abstract
A lens assembly which is capable of being set either to a normally focused position or to a position where the lens effects a soft focus mode, with both types of operation being performed by actuation of a single actuator member.
Claims3
A lens assembly comprising:
- (a) first and second lens holder members containing first and second lenses for focusing respectively and defining an optical axis;
- (b) an actuator member capable of a rotative operation about said optical axis of said lenses and a linear operation along said optical axis;
- (c) a linear moving member responsive to rotation of said actuator member for linear movement;
- (d) lens moving means operative upon engagement with said linear moving member to adjust the distance between said first and said second lens holder members in accordance with the movement of said moving member thereby to perform a focusing operation;
- (e) means for moving said first lens holder member to change the aberration of said lens assembly, said means connecting said actuator member and said first lens holder member with each other and being responsive to linear movement of said actuator member for moving said first lens holder member so that said lens assembly is set in a position where the aberration thereof is changed.
2 more elements
Dependencies are inferred from the claim text.