Multi-blade lens-aperture control mechanism
US6161966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1999 |
| Grant date | Dec 19, 2000 |
| Priority date | — |
| Expiry date | Jun 29, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens-aperture control mechanism is provided for use in a lens unit to control the aperture of the lens unit. The lens-aperture control mechanism includes a plurality of blades, each being movable radially inward into the lens barrel and outward from the lens barrel; a rotatable ring coupled to the blades, capable of urging the blades to move radially inward into the lens barrel when being turned in a first direction and outward from the lens barrel when being turned in a second direction; and a power driver for driving the rotatable ring to turn in a specified direction by a specified angular displacement so as to move the blades to a specific radial position to define a specific aperture for the lens unit. The inner end of each of the blades is formed in a concave shape or a curved haft-cutaway portion. When combined, the inner ends of the blades can define a near-circular aperture for the lens unit. This lens-aperture control mechanism can variably control the lens aperture to the desired value and can provide a near-circular aperture for the lens. Moreover, the lens-aperture control mechanism, being simple in mechanical construction, is easy to assemble and thus low in manufac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.