Lens barrel with higher focusing accuracy
AssigneeNikon Corporation
InventorHiroshi Okano
Life of this patent
Estimating the term…
Abstract
A lens barrel comprising a first member formed with a guide groove, and a second member having a main protrusion inserted into the guide groove and moving relative to the first member along the guide grove by moving the main protrusion within the guide groove. The lens barrel further comprises a displacement protrusion provided in a position, different from a position provided with the main protrusion, on the second member in a direction perpendicular to the guide groove. The displacement protrusion is inserted into the guide groove and contacts one side surface of the guide groove, thereby removing a play between the main protrusion and the guide groove.
Claims17
In a lens barrel comprising:
- a first member formed with a guide groove;
- and
- a second member having a main protrusion inserted into said guide groove and moving relative to said first member along said guide groove by moving said main protrusion within said guide groove, the improvement comprising a displacement protrusion provided in a position on said second member and in a position displaced in a direction orthogonal to a direction in which said guide groove extends, the positions being different from the position where said main protrusion is provided in the extending direction of said guide groove, and
- said displacement protrusion being inserted into said guide groove and being in contact with one side surface of said guide groove, thereby a play of said main protrusion with respect to said guide groove being removed.
A lens barrel comprising:
- a first member formed with a guide groove;
- and
- a second member having a main protrusion inserted into said guide groove and moving relative to said first member along said guide groove by moving said main protrusion within said guide groove,
- wherein said second member further has an auxiliary protrusion insertable into said guide groove,
- an area of said guide groove, into which said auxiliary protrusion is inserted, displaces in a direction perpendicular to an extending direction of said guide groove with respect to an area into which said main protrusion is inserted, and
- said auxiliary protrusion contacts one side surface of said guide groove displaced and thereby removes a play of said main protrusion with respect to said guide groove.
A lens barrel comprising:
- first and second lens units;
- a first barrel member supporting said first lens unit and having a guide groove extending within a barrel wall;
- a second barrel member supporting said second lens unit, and having a portion fitted and overlapped with said first barrel member and also a first protrusion provided in said overlapped portion and engaging with said guide groove, said first and second barrel members moving relative to each other while said protrusion is guided along said guide groove by action of an external force to thereby change an optical state,
- said second barrel member being provided with a second protrusion in a position displaced in a direction orthogonal to a direction in which the guide groove extends where the first protrusion engages the guide groove, and
- said second protrusion being in contact with said guide groove, thereby a play of said first protrusion with respect to said guide groove being absorbed.
Dependencies are inferred from the claim text.