Objective lens driving unit and optical pickup device having the same
AssigneeFunai Electric Co., Ltd.
InventorKazuhiro Takahashi
Life of this patent
Estimating the term…
Abstract
The movable holder of the objective lens driving unit is provided with an opening hole. An objective lens retaining portion for retaining an objective lens is disposed at the upper portion of the opening hole, while a liquid crystal element retaining portion for retaining a liquid crystal element is disposed at the lower portion of the opening hole. The movable holder is further provided with a bore that extends from the side face of the movable holder in the direction substantially perpendicular to the optical axis of the objective lens and reaches a side face 6b of the liquid crystal element retained by the liquid crystal element retaining portion so that adhesive can be injected from the bore.
Claims5
An objective lens driving unit for moving an objective lens and a liquid crystal element, comprising a movable holder having:
- the objective lens for condensing a light beam emitted from a light source on a recording surface on an optical recording medium;
- the liquid crystal element for correcting aberration disposed between the light source and the objective lens so as to face the objective lens;
- an opening hole;
- an objective lens retaining portion disposed at one end of the opening hole for retaining the objective lens;
- and
- a liquid crystal element retaining portion disposed at the other end of the opening hole for retaining the liquid crystal element, wherein
- the movable holder is provided with an injection hole for injecting adhesive for fixing the liquid crystal element to the movable holder.
An optical pickup device equipped with a light source and an objective lens driving unit for moving an objective lens and a liquid crystal element, the objective lens driving unit comprising a movable holder having:
- the objective lens for condensing a light beam emitted from a light source on a recording surface on an optical recording medium;
- the liquid crystal element for correcting aberration disposed between the light source and the objective lens so as to face the objective lens;
- an opening hole;
- an objective lens retaining portion disposed at one end of the opening hole for retaining the objective lens;
- and
- a liquid crystal element retaining portion disposed at the other end of the opening hole for retaining the liquid crystal element, wherein
- the movable holder is provided with an injection hole provided to a side face of the movable holder for injecting adhesive for fixing the liquid crystal element to the movable holder, injection hole being a bore extending from the side face of the movable holder in the direction substantially perpendicular to the optical axis of the objective lens and reaches the side face of the liquid crystal element.
Dependencies are inferred from the claim text.