KR970012377A - Dual Focus Optical Pickup - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual focus optical pickup apparatus of a digital disk player, and more particularly, to a dual focus optical pickup of a digital disk player capable of selectively reading information recorded on a disk having a thickness of 1.2 mm and a disk having a thickness of 0.6 mm. It relates to a pickup device.

To this end, the first and second objective lenses are installed at predetermined positions at an upper predetermined position of the holder to condense a laser beam on the disk, and the first and second objective lenses are installed at predetermined intervals below the first and second objective lenses, respectively. First and second wavelength conversion units for converting the optical information of the P wave recorded in the S wave into the S wave, and are respectively provided with a predetermined interval under the first and second wavelength conversion units, and the P wave passes through a predetermined slope The first and second beam splits coated with the first and second polarizing films reflecting the light beams, respectively, and are disposed at predetermined intervals below the first and second beam splits to maintain the laser beam having a predetermined wavelength linearly. First and second laser diodes, first and second beams, which are respectively installed at predetermined intervals below the first and second collimated lenses and the first and second collimated lenses to generate laser beams having a predetermined wavelength. Installed on one side of the pleat A third collimating lens for converging optical information of the air disk, a prism installed at one side of the third collimating lens at a predetermined interval and a knife edge is formed at one side to generate a focus error, and installed at one side of the prism The photodetector converts optical information such as focusing and tracking errors into electrical signals.

(Selectivity: FIG. 5)

Description

Dual Focus Optical Pickup

Since this is an open matter, no full text was included.

5 is a block diagram of a dual focus optical pickup apparatus according to the present invention.

Claims (4)

Permanent magnets 71a and 71b are provided inside the yoke plate 70 and are disposed between the holder 74 and the permanent magnets 71a and 71b on which the objective lens is placed, thereby raising and lowering the holder 74. In the optical pickup apparatus having focusing coils 73a, 73b and tracking coils 72a, 72b which move to the left and right to perform focusing and tracking adjustment, an appropriate interval at an upper predetermined position of the holder 74 is provided. Installed at a predetermined distance below the first and second objective lenses 75 and 76 and the first and second objective lenses 75 and 76 for condensing a laser beam on the disk. A predetermined interval is provided below the first and second wavelength converters 87 and 88 and the first and second wavelength converters 87 and 88 for converting the optical information of the P wave recorded on the S wave. First and second beam splits 79 (coated with first and second polarizing films 79b and 80b), which are respectively provided and pass P waves through predetermined slopes 79a and 80a and reflect S waves. 80), the first And first and second collimated lenses 81, 82, and first installed at a lower side of the second beam split 79 and 80 at predetermined intervals to maintain a laser beam having a predetermined wavelength linearly. And first and second laser diodes 77 and 78 provided at predetermined intervals below the second collimated lenses 81 and 82 to generate laser beams having a predetermined wavelength, and the first and second beams. A third collimated lens 85 installed at one side 79 and 80 of the split to focus optical information of the disk, and a third collimated lens 85 provided at one side of the third collimated lens 85 at a predetermined interval and a knife on one side Dual focus is formed on the prism 84, the edge 86 is formed to generate a focus error, is installed on one side of the prism 84 to convert the optical information, such as focus and tracking errors into an electrical signal to convert the optical information into an electrical signal 83 Optical pickup. The dual focus optical pickup apparatus of claim 1, wherein the first and second objective lenses (75, 76) are arranged symmetrically with each other at a predetermined interval on the holder (74). The first and second objective lenses 75 and 76 of claim 1, wherein two first and second objective lenses 75 and 76 are disposed on the upper side of the holder 74 at predetermined intervals. Dual focus optical pickup device characterized in that arranged side by side. The method of claim 1, wherein the first and second beam split (79, 80) is characterized in that the inclined surfaces (79a, 80a) for reflecting and transmitting the laser beam are arranged in the same direction with each other. Dual Focus Optical Pickup. ※ Note: The disclosure is based on the initial application.