Optical head device for absorbing vibrations in an objective lens
View Patent ↗An optical head device comprises a lens holder in which an objective lens and drive coils are mounted and a plurality of elastic support members which support the lens holder to move in a focusing direction and a tracking direction. The lens holder has a coil holding portion for holding the drive coils and a lens holding portion which projects from the coil holding portion to the front to hold the objective lens. The lens holding portion is formed thinner than the coil holding portion to avoid interference with a deflecting element positioned beneath the lens holding portion. The lens holding portion has a flat surface with an arc shape from the side portion to the front along the outer circumference of the objective lens. The lens holding portion also has a first vibration-absorbing member attached to the front end portion thereof.
1. An optical head device comprising:
a lens holder in which an objective lens and drive coils are mounted;
a plurality of elastic support members which support said lens holder to move in a focusing direction and a tracking direction;
said lens holder having a coil holding portion for holding said drive coils and a lens holding portion which projects from said coil holding portion to the front to hold said objective lens; and
said lens holding portion being formed thinner than said coil holding portion to avoid interference with a deflecting element positioned beneath said lens holding portion, having a flat surface with an arc shape from the side portion to the front along the outer circumference of said objective lens so as to gather vibrations in the focusing direction at a front end portion of the lens holding portion, and having first vibration-absorbing member attached to the front end portion thereof such that an attaching face of the first vibration absorbing member is formed in the focusing direction so as to absorb the vibrations in the focusing direction
wherein the lens holding portion is formed as a flat surface and includes a wide portion that extends at an equal width from the coil holding portion, and a side portion which inclines inwardly and widely from the border with the wide portion, and a front portion which is shaped to border with the side portion along the outer circumstance of the objective lens.
2. An optical head device comprising:
a lens holder in which an objective lens and drive coils are mounted;
a plurality of elastic support members which support said lens holder to move in a focusing direction and a tracking direction;
said lens holder having a coil holding portion for holding said drive coils and a lens holding portion which projects from said coil holding portion to the front to hold said objective lens;
said lens holding portion being formed thinner than said coil holding portion to avoid interference with a deflecting element positioned beneath said lens holding portion and to gather vibrations in the tracking direction at a border between said coil holding portion and said lens holding portion; and
at least one second vibration-absorbing member being provided at the border between said coil holding portion and said lens holding portion such that an attaching face of the second vibration absorbing member is formed in the tracking direction so as to absorb the vibrations in the tracking direction,
wherein the lens holding portion is formed as a flat surface and includes a wide portion that extends at an equal width from the coil holding portion, and a side portion which inclines inwardly and widely from the border with the wide portion, and a front portion which is shaped to border with the side portion along the outer circumstance of the objective lens.
3. The optical head device as set forth in claim 2 , wherein said lens holding portion has a flat surface with an arc shape from the side portion to the front along the outer circumference of said objective lens, and has a first shock-absorbing member attached to the front end portion thereof.