Optical-pick up device using multi-lens holder
AssigneeSony Corporation
InventorHirotoshi Fujisawa
Life of this patent
Estimating the term…
Abstract
In an optical pick-up device adapted for detecting light reflected from a disc by using a photo detector to drive an object lens in focus and tracking directions on the basis of a detected signal of the photo detector, a multi-lens for improving sensitivity and accuracy of the photo detector and a multi-lens holder for holding the multi-lens are provided, wherein the multi-lens holder is such a shape that it traverses a first optical path from a light source to a beam and traverses a second optical path from the beam splitter to the photo detector. Thus, adjustment of the spacing between the multi-lens and the photo detector can be facilitated, and the shape of the optical pick-up device itself can be thin and light-weight.
Claims6
An optical pick-up device comprising;
- a light source;
- reflecting means for reflecting light emitted from the light source to an object lens;
- object lens driving means for driving the object lens in a focusing direction and in a tracking direction;
- spectral means for optically separating the light emitted from the light source and reflected light from an optical disc incident through the object lens;
- a base member for supporting the light source, the reflecting means, the spectral means and detecting means for detecting the reflected light optically separated by the spectral means;
- a multi-lens disposed between the detecting means and the spectral means to shape form of the reflected light optically separated by the spectral means;
- and
- multi-lens holding means for holding the multi-lens movably supported on the base member in a moving direction that crosses a first optical path formed between the light source and the spectral means, and is substantially parallel to a second optical path formed between the spectral means and the detecting means.
Dependencies are inferred from the claim text.