Back to results
US 5,781,351 AGranted
Mounting structure of objective lens for optical pick-up used for optical disk device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYutaka Murakami, Takao Hayashi, Tomotada Kamei
Life of this patent
Estimating the term…
Abstract
An optical pick-up for use in optical disk devices comprises an objective lens having an outer ring formed therearound and a lens holder for positioning and holding the objective lens, the lens holder having first and second inner walls between which an annular shoulder portion is formed, and plural recesses formed on the annular shoulder portion as reservoirs into which excess adhesive agent is collected when adhesive agent is applied to a gap defined between the first inner wall and the outer ring of the objective lens. Various structures for collecting excess adhesive agent are also disclosed.
Claims15
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- and
- a lens holder having a hole into which the objective lens is inserted;
- and
- at the bottom of said hole, an annular member having plural recesses and having an inside diameter greater than the diameter of the inside circumference of said outer ring,
- wherein the objective lens is inserted into said hole and is supported by the annular member, and
- wherein the outer ring is fastened to the lens holder with adhesive.
4 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- a lens holder having a hole into which the objective lens is inserted;
- and
- an annular member at the bottom of said hole into which the objective lens is inserted,
- said annular member having an inside diameter at the bottom of said hole that is greater than the diameter of the inside circumference of said outer ring, and
- having plural recesses disposed on said annular member,
- wherein said lens holder has adhesive channels around said hole disposed on said lens holder at positions corresponding to said recesses,
- wherein the objective lens is inserted into said hole and supported by the annular member,
- wherein adhesive is injected in said adhesive channels, and
- wherein the objective lens is bonded to the lens holder.
7 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- a lens holder having a hole into which the objective lens is inserted;
- and
- an annular member at the bottom of said hole into which the objective lens is inserted,
- said annular member having an inside diameter at the bottom of said hole that is greater than the diameter of the inside circumference of said outer ring, and
- having plural recesses disposed on said annular member,
- wherein said lens holder has adhesive channels around said hole disposed on said lens holder at positions corresponding to said recesses,
- wherein said adhesive channels have a channel width in the circumferential direction that is less than that of said recesses, and
- wherein the objective lens is inserted into said hole and supported by the annular member,
- wherein adhesive is injected in said adhesive channels, and
- wherein the objective lens is bonded to the lens holder.
8 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- and
- a lens holder having a hole into which the objective lens is inserted;
- and
- at the bottom of said hole, an annular member having an inside diameter greater than the diameter of the inside circumference of said outer ring and having plural recesses of which the floor is inclined toward the outside circumference, and
- wherein the objective lens is inserted into said hole and is supported by the annular member, and
- wherein the outer ring is fastened to the lens holder with adhesive.
4 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- a lens holder having a hole into which the objective lens is inserted;
- and
- an annular member at the bottom of said hole into which the objective lens is inserted,
- said annular member having an inside diameter at the bottom of said hole that is greater than the diameter of the inside circumference of said outer ring, and
- having plural recesses on a top of said annular member,
- wherein said lens holder has horizontal slots for bleeding adhesive to the outside formed in the outside circumference wall thereof at positions corresponding to said recesses;
- wherein the objective lens is inserted into said hole and supported by the annular member, and
- wherein the outer ring is bonded with the lens holder by means of adhesive on the recesses.
6 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- a lens holder having a hole into which the objective lens is inserted;
- and
- an annular member at the bottom of said hole into which the objective lens is inserted,
- said annular member having an inside diameter at the bottom of said hole that is greater than the diameter of the inside circumference of said outer ring, and
- having plural recesses disposed on said annular member,
- wherein said lens holder has an annular channel around the outside circumference of said annular member;
- wherein the objective lens is inserted into said hole and supported by the annular member, and
- wherein the outer ring is bonded with the lens holder by means of adhesive on the recesses.
6 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- and
- a lens holder having a hole into which the objective lens is inserted,
- wherein a split recess divides a side wall of said hole circumferentially into plural wall sections;
- and
- an annular member at the bottom of said hole having an inside diameter that is greater than the diameter of the inside circumference of said outer ring,
- and plural recesses disposed on said annular member,
- wherein the objective lens is inserted into said hole and supported by the annular member, and
- wherein the outer ring is bonded with the lens holder by means of adhesive on the recesses.
6 more elements
An objective lens holding structure for an optical pick-up, comprising at least:
- an objective lens for focusing a light beam, said objective lens having a curvature and having an outer ring with a flat surface around the outside circumference of the lens curvature;
- and
- a lens holder having a hole into which the objective lens is inserted,
- wherein a split recess divides a side wall of said hole circumferentially into plural sections, and
- wherein the side wall is disposed on the outside circumference of the split recess;
- and
- an annular member at the bottom of said hole having an inside diameter that is greater than the diameter of the inside circumference of said outer ring,
- wherein the objective lens is inserted into said hole and supported by the annular member, and
- wherein the outer ring is bonded with the lens holder by means of adhesive.
6 more elements
Dependencies are inferred from the claim text.