Lens mounting comprising at least three circumferentially spaced bearings
AssigneePilkington P.E. Limited
InventorsPaul Spedding, George Hood
Life of this patent
Estimating the term…
Abstract
An arrangement (10) for mounting a lens for axial movement comprises a housing (12) defining an axially extending bearing surface (14) and a lens carriage (16) including least three circumferentially spaced bearings (20, 21, 22) in contact with the bearing surface (14) and permitting axial movement of the carriage (16) relative to the housing (12). One of the bearings (20) is biassed towards the bearing surface (14). In use, the arrangement (10) maintains a three-point contact between the lens carriage (16) and the bearing surface (14) despite geometrical variations in the surface.
Claims14
An arrangement for mounting a lens for axial movement, the arrangement comprising:
- a housing having an axis and defining an axially extending surface extending parallel to said axis;
- and
- a member for mounting a lens and comprising at least three circumferentially spaced bearings in contact with the surface and permitting axial movement of the member relative to the housing along said surface and parallel to said axis, at least one of the bearings being biassed towards the surface.
An arrangement for mounting a lens for axial movement, the arrangement comprising:
- a housing defining an axis;
- and
- a member for mounting a lens,
- one of the housing and the member defining a surface extending parallel to said axis and the other of the housing and the member including at least three circumferentially spaced bearings in contact with the surface and permitting movement of the member relative to the housing along said surface and parallel to said axis, at least one of the bearings being biassed towards the surface.
A lens mounting arrangement comprising:
- a housing defining an axially extending surface;
- and
- a lens carriage having three circumferentially spaced bearings in contact with the surface and permitting axial movement of the carriage relative to the housing;
- the bearings defining three contact points and one of the bearings being biassed tangentially relative to a circumference described by said contact points towards the surface.
An arrangement for mounting lens for axial movement, the arrangement comprising:
- a housing having an axis and defining a surface extending parallel to said axis;
- and
- a member for mounting a lens and the member comprising at least three circumferentially spaced bearings in contact with the surface and permitting movement of the member relative to the housing along said surface and parallel to said axis and means for biassing at least one of the bearings towards the surface.
Dependencies are inferred from the claim text.