Issued Patents All Time
Showing 151–175 of 222 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6449237 | Optical recording and pickup head for digital versatile disc compatible with read-writable compact disc by adopting flat plate lens having staircase type diffraction grating structure | Jang-hoon Yoo, Kun-ho Cho, Pyong-yong Seong | 2002-09-10 |
| 6430139 | Objective lens for high-density optical focusing, and optical pickup using the same | Jang-hoon Yoo, Kun-ho Cho, Seung-tae Jung, Chong-sam Chung, Dong-Ho Shin | 2002-08-06 |
| 6400666 | Optical pickup device | Jang-hoon Yoo, Kun-ho Cho, Yong-hoon Lee, Seok-jung Kim, Seung-tae Jung +1 more | 2002-06-04 |
| 6396638 | Optical pickup device capable of stable tracking | Jang-hoon Yoo, Kun-ho Cho, Seung-tae Jung, Joong-eon Seo, Dong-Ho Shin | 2002-05-28 |
| 6363046 | Optical recording/pickup head compatible with a digital versatile disk (DVD) and a recordable compact disk (CD-R) using a holographic variable aperture | Jang-hoon Yoo | 2002-03-26 |
| 6359850 | Optical pickup having catadioptric objective lens | Chong-sam Chung, Kun-ho Cho, Yong-hoon Lee | 2002-03-19 |
| 6345029 | Optical pickup apparatus and method | Jang-hoon Yoo | 2002-02-05 |
| 6337841 | Compatible optical pickup | Kun-soo Kim, Jong-ryull Kim, Myoung Soo Choi, Hyung-taek Oh, Jong-hwa Yu +3 more | 2002-01-08 |
| 6314067 | Optical disk having pattern for tilt detection | Chong-sam Chung, In-sik Park | 2001-11-06 |
| 6285646 | Optical pickup using objective lens compatible with a plurality of optical disks | Jang-hoon Yoo, Yong Jae Lee, Pyong-yong Seong | 2001-09-04 |
| 6275461 | Optical pickup using an optical phase plate | Jang-hoon Yoo, Chong-sam Chung, Pyong-yong Seong, Kun-ho Cho, Hyun-seob Choi +3 more | 2001-08-14 |
| 6272096 | Optical pickup using an optical phase plate | Jang-hoon Yoo, Chong-sam Chung, Pyong-yong Seong, Kun-ho Cho, Hyun-seob Choi +3 more | 2001-08-07 |
| 6266315 | Catadioptric optical system, optical pickup and optical disk drive employing the same, and optical disk | Chong-sam Chung, Yong-Moon Lee, Cheol-sung Yeon, Joong-eon Seo, Young-min Cheong +4 more | 2001-07-24 |
| 6259668 | Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses | Jang-hoon Yoo | 2001-07-10 |
| 6233217 | Optical pickup for recording/reproduction with a light emitting diode light source | Jang-hoon Yoo, Kun-ho Cho | 2001-05-15 |
| 6222812 | Optical pickup using an optical phase plate | Jang-hoon Yoo, Chong-sam Chung, Pyong-yong Seong, Kun-ho Cho, Hyun-seob Choi +3 more | 2001-04-24 |
| 6212154 | Optical pickup for optical disk and light source for optical pickup | Jang-hoon Yoo | 2001-04-03 |
| 6198714 | Optical pickup having an objective lens compatible with a plurality of optical disk formats | Jang-hoon Yoo, Chong-sam Chung, Kun-ho Cho | 2001-03-06 |
| 6147955 | Optical pickup device to read from and record information to disks of different thicknesses | Jang-hoon Yoo | 2000-11-14 |
| 6114689 | Optical pickup device | Kun-ho Cho, Jang-hoon Yoo, Yong-hoon Lee, Chong-sam Chung | 2000-09-05 |
| 6091691 | Optical pickup having an objective lens compatible with a plurality of optical disk formats | Jang-hoon Yoo, Chong-sam Chung, Kun-ho Cho | 2000-07-18 |
| 6088170 | Optical system for shaping light beams and an optical pickup employing the same | Pyong-yong Seong, Tae Kyung Kim | 2000-07-11 |
| 6081498 | Optical pickup compatible with recordable compact disk and digital video disk using plane parallel plates | Jang-hoon Yoo, 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 | Jang-hoon Yoo | 2000-06-20 |
| 6043912 | Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens | Jang-hoon Yoo | 2000-03-28 |