Optical system and optical apparatus
First Claim
1. An image-forming optical system which forms an image of an object,said image-forming optical system comprising at least one prism member,wherein said prism member has a first surface and a second surface, which face each other across a medium having a refractive index (n) larger than 1 (n>
- 1), so that light rays entering said prism member from an object side thereof are reflected at least twice in said prism member,wherein both said first surface and said second surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface.
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Accused Products
Abstract
The present invention is an optical apparatus, e.g. an image display apparatus, which enables observation of a clear image at a wide field angle with substantially no reduction in the brightness of the observation image, and which is extremely small in size and light in weight and hence unlikely to cause the observer to be fatigued. The optical apparatus has an image display device (6), and an ocular optical system (7) for leading an image of the image display device (6) to an observer'"'"'s eyeball (1). The ocular optical system (7) includes, in order from the image side, a third surface (5) which forms an entrance surface, a first surface (3) which forms both a reflecting surface and an exit surface, and a second surface (4) which forms a reflecting surface. The first to third surfaces (3 to 5) are integrally formed with a medium put therebetween which has a refractive index larger than 1. A bundle of light rays emitted from the image display device (6) enters the ocular optical system (7) while being refracted by the third surface (5) and is internally reflected by the first surface (3) and reflected by the second surface (4). Then, the ray bundle is incident on the first surface (3) again and refracted thereby so as to be projected into the observer'"'"'s eyeball with the observer'"'"'s iris position or eyeball rolling center as the exit pupil (1).
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Citations
42 Claims
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1. An image-forming optical system which forms an image of an object,
said image-forming optical system comprising at least one prism member, wherein said prism member has a first surface and a second surface, which face each other across a medium having a refractive index (n) larger than 1 (n> - 1), so that light rays entering said prism member from an object side thereof are reflected at least twice in said prism member,
wherein both said first surface and said second surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- 1), so that light rays entering said prism member from an object side thereof are reflected at least twice in said prism member,
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23. An ocular optical system arranged to lead an image formed on an image plane to an observer'"'"'s eyeball,
said ocular optical system comprising at least one prism member, wherein said prism member has a first surface and a second surface, which face each other across a medium having a refractive index (n) larger than 1 (n> - 1), so that light rays entering said prism member from an image side thereof are reflected at least twice in said prism member,
wherein both said first surface and said second surface are curved surface configurations, and at least one of the curved surface configurations is formed from a rotationally asymmetric curved surface. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
- 1), so that light rays entering said prism member from an image side thereof are reflected at least twice in said prism member,
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39. In a finder optical system comprising an objective optical system for forming an object image;
- an image erecting optical system for erecting said object image; and
an ocular optical system for observing said object image;the improvement which comprises at least one prism member, wherein said prism member has two surfaces having a reflecting action to reflect the image in said prism member, and two surfaces having a transmitting action to transmit light, and wherein said prism member has at least one rotationally asymmetric curved surface. - View Dependent Claims (40, 41, 42)
- an image erecting optical system for erecting said object image; and
Specification