Optical system with grating element and imaging device using the

Details Optical system with grating element and imaging device using the Optical system with grating element and imaging device using the

1997-09-09

2000-04-25

Spyrou, Cassandra

Optical: systems and elements

Diffraction

From grating

359565, 359569, 359570, 359571, 359742, G02B 518

Patent

active

060551054

ABSTRACT:
An optical system that can be used in an optical imaging system and displays good imaging performance with corrected chromatic aberration without increasing the number of lenses is provided by employing a lens surface with a diffractive effect. The optical system uses a lens with a concave incident surface and positive refractive power. A grating element surface 40 with positive refractive power is formed on at least one surface of the lens. The surface on which the grating element is formed is an aspherical surface with a radius of curvature that becomes bigger with increasing distance from the optical axis.

REFERENCES:
patent: 5260828 (1993-11-01), Londono et al.
patent: 5323264 (1994-06-01), Kato
patent: 5581405 (1996-12-01), Meyers et al.
William C. Sweatt, "Describing Holographic Optical Elements as Lenses", Journal of Optical Society of America, vol. 67, No. 6, pp. 803-808.

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