Issued Patents All Time
Showing 76–98 of 98 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6081498 | Optical pickup compatible with recordable compact disk and digital video disk using plane parallel plates | Chul-woo Lee, Chong-sam Chung | 2000-06-27 |
| 6078555 | Optical head assembly having compatibility with digital versatile disk (DVD) and a recordable compact disk (CD-R) and for obtaining a high-speed access time | Chul-woo Lee | 2000-06-20 |
| 6043912 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens | Chul-woo Lee | 2000-03-28 |
| 6016293 | Method of discriminating discs having different thickness and optical pickup device adopting the same | Chul-woo Lee, Chong-sam Chung | 2000-01-18 |
| 6009066 | Optical pickup of two different wavelength laser sources with an objective lens having an annular shielding region | Chul-woo Lee | 1999-12-28 |
| 5987924 | Lens mold and method of manufacturing a lens | Chul-woo Lee, Dong-Ho Shin, Kyung-hwa Rim, Chong-sam Chung, Kun-ho Cho +2 more | 1999-11-23 |
| 5986993 | Optical pickup device having a diaphram with a predetermined aperture | Chul-woo Lee, Kyung-hwa Rim | 1999-11-16 |
| 5909424 | Optical pickup device and method to read from and record information to disks of different thicknesses | Chul-woo Lee | 1999-06-01 |
| 5907530 | Optical pickup device | Kun-ho Cho, Eung-Ho Kim, Kyung-hwa Rim | 1999-05-25 |
| 5903536 | Objective lens device, optical pickup adopting the same and method for manufacturing an objective lens | Chul-woo Lee | 1999-05-11 |
| 5841754 | Optical pickup device having an objective lens and auxiliary lenses exterior thereof | Chul-woo Lee | 1998-11-24 |
| 5822135 | Lens device including a light controlling mechanism and an optical pickup apparatus using a lens device | Chul-woo Lee, Dong-Ho Shin, Kyung-hwa Rim, Chong-sam Chung, Kun-ho Cho +2 more | 1998-10-13 |
| 5805556 | Optical pickup apparatus having a holographic optical element | Chul-woo Lee, Yong-hoon Lee, Kyung-hwa Rim | 1998-09-08 |
| 5802037 | Optical detector with two detecting regions for reproducing and recording information on two kinds of disks having different thicknesses | Chul-woo Lee, Kyung-hwa Rim, Chong-sam Chung, Kun-ho Cho, Soo Jung | 1998-09-01 |
| 5793407 | Method and apparatus for forming a light spot smaller than a theoretical limit for high density recording | Tae Seok Park, Chul-woo Lee | 1998-08-11 |
| 5777973 | Reproducing and recording optical pickup compatible with discs having different thicknesses | Chong-sam Chung, Chul-woo Lee, Kyung-hwa Rim, Kun-ho Cho | 1998-07-07 |
| 5737299 | Optical pickup apparatus having wave plates | Chul-woo Lee | 1998-04-07 |
| 5703862 | Dual focus objective lens with two curvatures for focussing light on two different kinds of disks with different thicknesses | Chul-woo Lee | 1997-12-30 |
| 5699339 | Inverse image generating method apparatus thereof and focus error detecting method using the same and apparatus thereof | Chul-woo Lee, Chong-sam Chung, Kyung-hwa Rim | 1997-12-16 |
| 5665957 | Lens device comprising light blocking means and an optical pickup apparatus using the lens device | Chul-woo Lee, Dong-Ho Shin, Kyung-hwa Rim, Chong-sam Chung, Kun-ho Cho +2 more | 1997-09-09 |
| 5629514 | Critical angle focus error detector | Chul-woo Lee, Chong-sam Chung, Kyung-hwa Rim | 1997-05-13 |
| 5587976 | Optical pickup for optical magnetic disc | Kyung-hwa Rim, Chong-sam Chung, Chul-woo Lee | 1996-12-24 |
| 5557597 | Focus error detector | Chul-woo Lee | 1996-09-17 |