| Patent Number |
Title Of Patent |
Date Issued |
| RE39025 |
Lens device including a light controlling mechanism and an optical pickup apparatus using a lens |
March 21, 2006 |
| A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in a |
| 5987924 |
Lens mold and method of manufacturing a lens |
November 23, 1999 |
| A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in a |
| 5986993 |
Optical pickup device having a diaphram with a predetermined aperture |
November 16, 1999 |
| An optical pickup device which can obtain a stable reproduction signal by increasing the numerical aperture of an objective lens includes an objective lens facing a disc, a light source for radiating light to the disc via the objective lens, a beam splitter provided between the light |
| 5907530 |
Optical pickup device |
May 25, 1999 |
| An optical pickup device which is capable of reproducing and recording information from at least two discs having different thicknesses includes a light source, an objective lens provided along the light path from the light source facing the plane of a disc and having a predetermined |
| 5822135 |
Lens device including a light controlling mechanism and an optical pickup apparatus using a lens |
October 13, 1998 |
| A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in a |
| 5805556 |
Optical pickup apparatus having a holographic optical element |
September 8, 1998 |
| An optical pickup apparatus for recording and reproducing information, which is manufactured to be extremely small in a hybrid type. The optical pickup apparatus includes a first holographic optical element as a beam expander for diffracting to enlarge a diverging angle of an incident be |
| 5802037 |
Optical detector with two detecting regions for reproducing and recording information on two kin |
September 1, 1998 |
| An optical pickup device which is capable of reproducing and recording information from/onto at least two kinds of discs having different thicknesses includes a light source, an objective lens provided along the light path from the light source facing the plane of a disc and having a |
| 5777973 |
Reproducing and recording optical pickup compatible with discs having different thicknesses |
July 7, 1998 |
| A reproducing/recording optical pickup compatible with discs having different thicknesses includes a transparent plate having a central portion formed with a diffraction grating pattern for diffracting the light travelling from the light source to the objective lens, and a transparen |
| 5665957 |
Lens device comprising light blocking means and an optical pickup apparatus using the lens devic |
September 9, 1997 |
| A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in a |
| 5587976 |
Optical pickup for optical magnetic disc |
December 24, 1996 |
| An optical pickup for an optical magnetic disc includes a light source, a grating for diffracting the light into a main light beam and auxiliary light beams, a plurality of magnetic dipole tips arranged above the optical magnetic disc so as to interact with the magnetic signal stored in |
