Image-forming optical system
First Claim
1. An image-forming optical system having a positive refracting power as a whole for forming an object image, said image-forming optical system comprising:
- only one prism member formed from a medium having a refractive index (n) larger than 1 (n>
1),said prism member having;
a first surface through which a light beam enters said prism member;
a second surface that reflects the light beam in said prism member;
a third surface that reflects the light beam reflected by said second surface in said prism member; and
a fourth surface through which the light beam reflected by said third surface exits from said prism member;
wherein at least one of said second surface and said third surface has a curved surface configuration that gives a power to a light beam, said curved surface configuration having a rotationally asymmetric surface configuration that corrects aberrations due to decentration;
wherein a pupil is provided between said first surface and fourth surface of said prism member.
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Accused Products
Abstract
A high-performance image-forming optical system made compact and thin by folding an optical path using reflecting surfaces arranged to minimize the number of reflections. The image-forming optical system has only one prism member. The prism member has a first surface through which a light beam enters the prism member, a second surface reflecting the incident light beam in the prism member, a third surface reflecting the reflected light beam in the prism member, and a fourth surface through which the light beam exits from the prism member. At least one of the second and third surfaces has a curved surface configuration that gives a power to a light beam. The curved surface configuration has a rotationally asymmetric surface configuration that corrects aberrations due to decentration. A pupil is provided between the first and fourth surfaces, for example, on the second surface.
77 Citations
28 Claims
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1. An image-forming optical system having a positive refracting power as a whole for forming an object image, said image-forming optical system comprising:
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only one prism member formed from a medium having a refractive index (n) larger than 1 (n>
1),said prism member having; a first surface through which a light beam enters said prism member; a second surface that reflects the light beam in said prism member; a third surface that reflects the light beam reflected by said second surface in said prism member; and a fourth surface through which the light beam reflected by said third surface exits from said prism member; wherein at least one of said second surface and said third surface has a curved surface configuration that gives a power to a light beam, said curved surface configuration having a rotationally asymmetric surface configuration that corrects aberrations due to decentration; wherein a pupil is provided between said first surface and fourth surface of said prism member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification