Object lens barrel, object lens barrel drive unit and optical information recording and reproducing unit
AssigneeSharp Kabushiki Kaisha
InventorIkuo Nakano
Life of this patent
Estimating the term…
Abstract
A combinational object lens 3 constructed of a first lens 1 and a second lens 2 is formed. The first lens 1 and a first lens barrel 4 for retaining the first lens 1 are fixed by bonding to a second lens barrel 5 for retaining the second lens 2 only via a spacer layer 7 made of an adhesive. With this arrangement, residual aberration of the combinational object lens constructed of a plurality of lenses can be reduced, and this further enables the compacting and reduction in weight of the object lens barrels, an object lens barrel drive unit and an optical information recording and reproducing unit.
Claims11
An object lens barrel comprising:
- at least a combinational object lens constructed of a plurality of lenses including at least a first lens and a second lens, wherein
- at least one of the first lens and a first lens barrel for retaining the first lens is fixed by bonding to at least one of the second lens or a second lens barrel for retaining the second lens via a spacer layer made of an adhesive.
An object lens barrel drive unit comprising:
- an object lens barrel provided with at least a combinational object lens constructed of a plurality of lenses including at least a first lens and a second lens, and
- a propelling force generating mechanism for driving the object lens barrel, wherein
- the object lens barrel is formed in a manner that a second lens barrel for retaining a second lens is fixed by bonding to at least one of the first lens and the first lens barrel for retaining the first lens only via a spacer layer made of an adhesive, and
- the second lens barrel concurrently serves as an object lens barrel holder for retaining the object lens barrel fixed to the propelling force generating mechanism and constitutes an aperture of the combinational object lens.
Dependencies are inferred from the claim text.