Patent ID: 6477330
Filing Date: 2002-11-05
Classification: G03B

Abstract:
An optical system which imprints, onto a film surface, data appearing on a photographing information/data display member located on an objective side relative to the film surface and which is separate from a photographing lens, whereinthe optical system comprises one meniscus lens having a positive refractive power and a brightness aperture and satisfies conditional expressions (1) through (3) provided below: 3.9&lE;L/F<5.0â€ƒâ€ƒ(1) 0.021/F<0.10â€ƒâ€ƒ(2) âˆ’0.53/Fwhere,L: is a distance from the photographing data display member to the film surface along an optical axis of a photographing lens, F: is a focal length of the meniscus lens, D1: is a distance from an aperture to the surface of the meniscus lens facing the aperture along the optical axis of the data-imprinting optical system, and R3: is a radius of curvature of the surface of the meniscus lens opposite that facing the aperture.