Focusing method for a decentered optical system
US6429971B2 · kind B2 · utility
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17References
12Claims
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Key dates
| Filing date | Dec 15, 2000 |
| Grant date | Aug 6, 2002 |
| Priority date | — |
| Expiry date | Dec 15, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focusing method for a decentered optical system including a decentered lens element has translationally moving and inclining at least one lens element for different object distances, in such a way that variation in a position of a primary image point is kept within a range defined by the following condition. Here &Dgr;fb represents a maximum distance traveled by the primary image point during focusing; and &THgr;max represents a maximum angle of peripheral rays traveling from a center of an object to a center of an image plane relative to a base ray:|&Dgr;fb ×sin(&THgr;max)|max≦0.8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.