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Please use this identifier to cite or link to this item:
http://hdl.handle.net/1783.1/411
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| Title: | Positioning apparatus for hard disk servowriter |
| Authors: | Cai, Li-Long
Zhou, Weidong |
| Keywords: | Position control
Hard disk servowriters
Optical read head |
| Issue Date: | 20-Feb-2001 |
| Citation: | US Patent 6,191,911. Washington, DC: US Patent and Trademark Office, 2001. |
| Abstract: | A servowriter positioning apparatus for hard disk drives comprises and optical read head 2 for directing three focussed light beams on grating sections formed at the end of a grating memer 1 connected to the servo write head(s) 3 in order to indicate the position and movement of the head(s) 3. The optical read head 2 may be based on CD or DVD technology. The servo write head(s) 3 are mounted on an actuator arm 5 to which the grating member 1 is fixed for rotation therewith and which are both driven in rotation by a rotary actuator. The grating member 1 comprises two grating sections 11,12 separated by a smooth section 13 for generating a focus error correction signal. The apparatus of the invention can be used to sense and control the position and movement of the servo write heads, or of the read/write heads of the hard disk themselves, thus eliminating the need for any servo pattern. |
| Rights: | This patent is also available at HKUST Technology Transfer Center Patent Search at <http://patentsearch.ttc.ust.hk/ListPatentsDetail.asp?id=111> |
| URI: | http://hdl.handle.net/1783.1/411 |
| Appears in Collections: | MECH Patents
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Files in This Item:
| File |
Description |
Size | Format |
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| US6191911.pdf | | 553Kb | Adobe PDF | View/Open |
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