Lens driving device
US10802240B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 2019 |
| Grant date | Oct 13, 2020 |
| Priority date | — |
| Expiry date | May 1, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2205/0053
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens driving device includes a lens frame that holds a lens, a rack provided pivotally with respect to the lens frame around a pivot shaft along an optical axis of the lens, a lead screw provided along the optical axis, a spring that makes the rack pivot around the pivot shaft, pushes the rack against the lead screw, and engages a tooth of the rack with a tooth of the lead screw, a driving unit that rotates the lead screw, and a nut that includes an end surface facing the rack along the optical axis with a gap C being included therebetween, that engages with the lead screw with backlash being included therebetween, and that is provided un-rotatably with respect to the lens frame. In a case where a half pitch of the tooth of the lead screw is A and the backlash along the optical axis between the lead screw and the nut is B, A>B+C is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.