Viewfinder optical system
First Claim
Patent Images
1. A viewfinder optical system comprising:
- a relay lens system for refocusing a primary image as a secondary image and including at least one surface having optical power of diffraction; and
an eyepiece optical system for magnifying the secondary image and including at least one surface having optical power of diffraction.
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Abstract
A viewfinder optical system has a relay lens system and an eyepiece optical system. The relay lens system refocuses a primary image as a secondary image. The relay lens system consists of a single lens element which has a surface having optical power of diffraction. The eyepiece optical system magnifies the secondary image and has a surface having optical power of diffraction.
9 Citations
31 Claims
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1. A viewfinder optical system comprising:
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a relay lens system for refocusing a primary image as a secondary image and including at least one surface having optical power of diffraction; and an eyepiece optical system for magnifying the secondary image and including at least one surface having optical power of diffraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A viewfinder optical system including at least two surfaces having optical power of both diffraction and refraction, wherein the optical power of refraction of said surfaces is equivalent to that of an aspherical surface.
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16. A Kepler-type viewfinder optical system comprising:
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an objective lens system for focusing rays from an object as an intermediate image and including at least one surface having optical power of diffraction; and an eyepiece optical system for magnifying the intermediate image and including at least one surface having optical power of diffraction. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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- 25. A viewfinder optical system comprising a plurality of lenses whose material is plastic, wherein at least one of said lenses includes at least one surface having optical power of diffraction and said viewfinder optical system is a real image-type optical system.
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31. A viewfinder optical system comprising:
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a relay lens system for refocusing a primary image as a secondary image; and an eyepiece optical system for magnifying said secondary image, wherein all of the lenses in said relay lens system and said eyepiece optical system are made of plastic, wherein at least one of said lenses includes at least one surface having an optical power of diffraction, and wherein said viewfinder optical system is a real image-type optical system.
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Specification