Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699339 | Inverse image generating method apparatus thereof and focus error detecting method using the same and apparatus thereof | Chul-woo Lee, Chong-sam Chung, Jang-hoon Yoo | 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, Chong-sam Chung, Kun-ho Cho, Pyong-yong Seong +2 more | 1997-09-09 |
| 5629514 | Critical angle focus error detector | Chul-woo Lee, Chong-sam Chung, Jang-hoon Yoo | 1997-05-13 |
| 5594714 | Focus error detection with two symmetrically splitted reflected beams | Chul-woo Lee, Pyong-yong Seong, Chong-sam Chung | 1997-01-14 |