Optical system having a diffractive optical element, and optical apparatus
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G02B-027/44
출원번호
US-0799058
(2001-03-06)
우선권정보
JP-0063398 (2000-03-08)
발명자
/ 주소
Hideki Ogawa JP
출원인 / 주소
Canon Kabushiki Kaisha JP
대리인 / 주소
Fitzpatrick, Cella, Harper & Scinto
인용정보
피인용 횟수 :
31인용 특허 :
26
초록▼
An optical system includes a diffractive optical element having a diffraction grating provided, on a lens surface having a curvature, in a concentric-circles shape rotationally-symmetrical with respect to an optical axis. The sign of the curvature of the lens surface having the diffraction grating p
An optical system includes a diffractive optical element having a diffraction grating provided, on a lens surface having a curvature, in a concentric-circles shape rotationally-symmetrical with respect to an optical axis. The sign of the curvature of the lens surface having the diffraction grating provided thereon is the same as the sign of a focal length, at a design wavelength, of a system composed of, in the optical system, a surface disposed nearest to an object side to a surface disposed immediately before the lens surface having the diffraction grating provided thereon, and is different from the sign of the distance from the optical axis to a position where the center ray of an off-axial light flux enters the lens surface having the diffraction grating provided thereon. Further, the apex of an imaginary cone formed by extending a non-effective surface of the diffraction grating is located adjacent to the center of curvature of the lens surface having the diffraction grating provided thereon.
대표청구항▼
1. An optical system, comprising:a diffractive optical element having a diffraction grating provided, on a lens surface having curvature, in a concentric-circles shape rotationally-symmetrical with respect to an optical axis, wherein the sign of the curvature of the lens surface having said diffract
1. An optical system, comprising:a diffractive optical element having a diffraction grating provided, on a lens surface having curvature, in a concentric-circles shape rotationally-symmetrical with respect to an optical axis, wherein the sign of the curvature of the lens surface having said diffraction grating provided thereon is the same as the sign of a focal length, at a design wavelength, of a system lying between and including the surface disposed nearest to a front side and a surface disposed immediately before the lens surface having said diffraction grating provided thereon, and is different from the sign of a distance from the optical axis to a position where a center ray of an off-axial light flux enters the lens surface having said diffraction grating provided thereon, wherein diffraction grating is a laminated diffraction grating, wherein said laminated diffraction grating is an adjacently-laminated diffraction grating in which two diffraction gratings are disposed adjacent to each other across an air layer, wherein said adjacently-laminated diffraction grating is provided between two adjacent lens surfaces having substantially the same curvature, and is composed of three layers, including, in order from the front side, a first layer, a second layer and a third layer, said second layer being the thin air layer.
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