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Lens shifter

A lens movement and lens technology, applied in the directions of driving/moving recording heads, head configuration/installation, instruments, etc., can solve problems such as difficulty in responding to driving forces, increasing the weight of moving parts, and high cost of components and assembly

Inactive Publication Date: 2004-11-24
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Therefore, more components must be utilized, which results in high cost of components and assembly
In addition, the balance weight 8 added to the movable section assembly increases the weight of the movable section assembly, thereby making it difficult for the assembly section and the objective lens to respond to driving forces along the focusing direction and the track direction.

Method used

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Examples

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Embodiment Construction

[0037]Reference will be made to the embodiments of the present invention below Figure 1 ~ Figure 4 Give a detailed description.

[0038] It is worth noting that although various better technical indicators have been described, and what is described below is a more optimized embodiment of the invention, the scope of the present invention is not limited to this form unless there is a reference to the present invention in the following descriptions. Invention specific limitations.

[0039] Figure 1 to Figure 3 Shown is a biaxial actuator of an embodiment of the invention. for Figure 1 to Figure 3 , a biaxial actuator includes a lens holder 11, a coil bobbin 12, a set of elastic supports 13a, 13b, 13c, 13d, a fixed portion 14 and a deflection coil 31.

[0040] Such as image 3 As shown, the aforementioned lens holder 11 is divided into an upper half 11U and a lower half 11L by a horizontal dividing line, and the two parts are connected together. Lens holder 11, such as ...

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Abstract

A lens moving apparatus of the present invention is used in an optical pickup of, for example, an optical recording / reproducing system. The apparatus includes a moving assembly holding an objective lens and provided with a coil bobbin, elastic supporting devices which support the moving assembly along the focusing dimension and the tracking dimension, focusing coils and tracking coils wound on the coil bobbin, and a magnetic circuit formed by a yoke and a magnet. The center of gravity of the moving assembly is positioned so that the product of the distance from an effective section of the focusing coil to the center of gravity of the moving assembly and the force produced at the effective section is about equal to the product of the distance from a noneffective section of the focusing coil to the center of gravity of the moving assembly and the force produced at the noneffective section.

Description

[0001] This application is a divisional application of the patent with the application number CN-95121659.7 filed on December 13, 1995, and the title of the invention is "lens moving device". technical field [0002] The present invention relates to a biaxial actuator for an optical pickup for recording and reproducing information on an optical information recording medium. An optical information recording medium such as an optical disk or a magneto-optical disk. Background technique [0003] Hitherto, signal reproduction and recording on information recording media such as optical discs (referred to as compact discs (CD) and magneto-optical discs) have been performed using optical pickups. The optical pickup includes a semiconductor laser used as a light source, an objective lens, an optical system, and a photodetector. [0004] In an optical pickup, a light beam emitted from a semiconductor laser is focused by an objective lens onto the recording surface of an optical dis...

Claims

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Application Information

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IPC IPC(8): G11B7/09
CPCG11B7/0935G11B7/08
Inventor 富田孝道三森幸治柴田圭一大熊英生
Owner SONY CORP