KR970063069A - The optical pickup device - Google Patents

Abstract

purpose

It is possible to swing the optical disk drive by limiting the constituent parts for tracking the top surface of the optical disk to a lightweight optical head so that the data access time recorded on the optical disk becomes extremely high.

Configuration

A braking unit fixedly installed on a chassis of an optical disk driver, and a movable unit swingable on an upper surface of the optical disk. The floating part includes a laser diode for generating a laser beam, a collimating lens for shaping the elliptical outgoing light flux generated therein into an equilibrium circular light, a polarizing prism for separating the fixed balanced circular light beam, And an objective lens for focusing the polarized circularly polarized light beam in the 1/4 wave plate. On the other hand, the light beam is reflected by the optical disk and diffracted and reflected 90 degrees through the polarization prism And a moving part which is provided with a light guiding member for guiding the light focused by the objective lens to the optical disc and a light guiding member attached to the end of the light guiding member for detecting the focusing and tracking signals. A split photodiode, and a green lens installed at the center of the quadrant photodiode.

Description

The optical pickup device

Since this is a trivial issue, I did not include the contents of the text.

FIG. 1 is a view showing a configuration of a main part of an optical pickup device according to the present invention; FIG.

FIG. 2 is a view for explaining an error detection method of focusing and tracking through an optical fiber in FIG. 1, wherein (a) is a state diagram at the time of focusing over, (b) State of regular focusing.

FIG. 3 is a schematic view showing a pick-up arm type optical disc driver to which the present invention is applied; FIG.

Claims (3)

A collimating lens for shaping the elliptical outgoing light flux into an equilibrium circular light flux, a polarizing prism for separating the flattened circular light flux and a balanced circular light flux passing through the polarizing prism 45 And an objective lens for focusing the polarized circularly polarized light beam in the 1/4 wave plate, and focuses the light that is reflected from the optical disk and is diffracted by 90 degrees through the polarization prism A driving unit having another objective lens for irradiating with a photodiode; A light guiding member for guiding light to the optical disc by the objective lens, a quadrant photodiode attached to the end of the light guiding member for detecting focusing and tracking signals, and a movable portion provided with a green lens provided at the center of the quadrant photodiode . The optical pickup apparatus according to claim 1, wherein the light guide material is an optical fiber. The optical pickup apparatus of claim 1, wherein the green lens is a plastic lens. ※ Note: It is disclosed by the contents of the first application.