Device for adjusting the diopter setting of a finder assembly
February 9, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3205774 3493290 3876875 Viewfinder system for a large camera View finder of variable magnification Optical mirror with c/c composite substrate and an intermediate layer of molydenum, tungsten, or niobium 40 to 100 μm thick Finding device of variable magnification Finder of variable magnification Variable magnification viewfinder Zoom finder of real image type Inventors
AssigneeApplicationNo. 385986 filed on 02/09/1995US Classes:359/432, Variable magnification359/422, Variable magnification359/431With prism or U-shaped optical pathExaminersPrimary: Nguyen, ThinhAttorney, Agent or FirmForeign Patent References
International ClassG02B 023/00Foreign Application Priority Data1991-05-17 JPAbstractA mechanism for adjusting the diopter setting of a finder assembly which has an objective optical system and an eyepiece optical system, includes an object side image forming position adjusting device which adjusts the position where an image is to be formed by the objective optical system. The mechanism effectively compensates for any change that occurs in the position where an image is formed by the objective optical system due to temperature or humidity variations. Thus, the problem of plastic lenses having their focal lengths extended in a hot and humid environment is solved by the invention.Field of SearchWith curved reflective imaging elementTwo or more in a series Concave, convex combination Selectable magnification Variable magnification With prism or U-shaped optical path Variable magnification With tilted lens or tilted image plane LENS With variable magnification (e.g., zoom type) With temperature compensation or control Including specified control or retention of the shape of a mirror surface Membrane mirror in mechanical contact only at its edge With structure to minimize internal mirror stress Including a plurality of adjustable mirror supports Plural mirrors or reflecting surfaces Composite or echelon mirrors or light concentrating array With a line focus Light concentrating (e.g., heliostat, etc.), concave, or paraboloidal structure | |
