Patent ID: 6124989
Filing Date: 2000-09-26
Classification: G02B,G03B

Abstract:
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; anda 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.