Rotary drive apparatus, optical scan apparatus, and image formation apparatus
US7671884B2 · kind B2 · utility
7Cited by
12References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2008 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Feb 22, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A rotary drive apparatus includes a rotary body with a support portion, a rotor magnet supported by the support portion of the rotary body, a fixation section facing the rotor magnet and rotatably supporting the rotary body, and a winding coil provided in the fixation section, in which an expression E1/E2≦0.75 is satisfied where Young's modulus of the rotor magnet is E1 [GPa], and Young's modulus of the support portion is E2 [GPa].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.