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US 5,400,181 AGranted
Lens barrel
AssigneeNikon Corporation
InventorToru Takayama
Life of this patent
Estimating the term…
Abstract
A lens barrel includes two movable lens groups. The outer peripheral portion of an internal lens holding ring is fitted to the inner peripheral portion of an external lens holding ring so that these two rings are slidable on each other. The external lens holding ring is formed with a guide slot with which a cam pin embedded in the internal lens holding ring engages. The cam pin engages with another guide slot formed in a different cylindrical member.
Claims4
A lens barrel comprising:
- a fixed drum having an inner peripheral surface formed with a first guide slot;
- a cylindrical member so supported on said fixed drum as to be rotatable about an optical axis and movable in optical-axis directions and formed with second and third guide slots;
- a first lens holding ring, so fitted to the inner peripheral surface of said cylindrical member as to be movable in the optical-axis directions, for holding a lens group, said first lens holding ring being formed with a fourth guide slot and including a first engaging member engaging with said first and second guide slots;
- and
- a second lens holding ring, so fitted to the inner peripheral surface of said first lens holding ring as to be movable in the optical axis directions, for holding another lens group, said second lens holding ring including a second engaging member engaging with said third guide slot through said fourth guide slot.
2 more elements
Dependencies are inferred from the claim text.