IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0055036
(2002-01-25)
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우선권정보 |
JP-0019653 (2001-01-29) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Olympus Optical Co., Ltd.
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
27 인용 특허 :
9 |
초록
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A de-centered optical system includes a first optical element having at least three surfaces surrounding a portion having a refractive index of more than 1, and a second optical element whose surface further from the first optical element is a convex surface and has a positive power and produces chr
A de-centered optical system includes a first optical element having at least three surfaces surrounding a portion having a refractive index of more than 1, and a second optical element whose surface further from the first optical element is a convex surface and has a positive power and produces chromatic aberration of magnification. When the de-centered optical system is used as an ocular optical system of an image observation apparatus, the image size observed through the de-centered optical system in the blue wavelength is larger than that formed in the green wavelength, and that formed in the green wavelength is larger than that formed in the red wavelength. The difference can be compensated by an electronic compensation means. This optical system can be used as an image taking optical system by setting the light traveling direction inversely to that in case when it is used as an ocular optical system.
대표청구항
▼
A de-centered optical system includes a first optical element having at least three surfaces surrounding a portion having a refractive index of more than 1, and a second optical element whose surface further from the first optical element is a convex surface and has a positive power and produces chr
A de-centered optical system includes a first optical element having at least three surfaces surrounding a portion having a refractive index of more than 1, and a second optical element whose surface further from the first optical element is a convex surface and has a positive power and produces chromatic aberration of magnification. When the de-centered optical system is used as an ocular optical system of an image observation apparatus, the image size observed through the de-centered optical system in the blue wavelength is larger than that formed in the green wavelength, and that formed in the green wavelength is larger than that formed in the red wavelength. The difference can be compensated by an electronic compensation means. This optical system can be used as an image taking optical system by setting the light traveling direction inversely to that in case when it is used as an ocular optical system. a wavelength generates an optical path shift is inverted by 180°-rotating the diffraction grating pair based on an optical path, a positive/negative state of a slope of wavelength dispersion (wavelength dispersion slope) is changed, and an amount of an optical path shift is varied by changing space in the diffraction grating pair. 5. The apparatus according to claim 1, wherein: said dispersive unit generating the optical path shift is at least one diffraction grating pair configured by arranging two diffraction gratings, which have angular dispersion in a direction substantially perpendicular to the plane including the directions of the lights angular-dispersed by the VIPA and at least two areas having angular dispersion in opposite directions, parallel and point-symmetric with each other; and angular dispersion is generated in an opposite direction by receiving a light on a different area by moving the diffraction grating pair, where a positive/negative state of a wavelength dispersion slope is changed by changing a direction that an optical path shift is generated according to a wavelength, and an amount of an optical path shift can be varied by changing space in a diffraction grating pair. 6. The apparatus according to claim 1, wherein: said dispersive unit generating the optical path shift is at least one diffraction grating pair configured by arranging two diffraction gratings, which have angular dispersion in a direction substantially perpendicular to the plane including the directions of the lights angular-dispersed by the VIPA and a plurality of areas having different angular dispersion, parallel and point-symmetric with each other; and different wavelength dispersion is generated by receiving a light on a different area by moving the diffraction grating pair, and an amount of an optical path shift is varied. 7. The apparatus according to any of claims 3 through 6, further comprising a control device controlling a temperature of a diffraction grating to stabilize the angular dispersion. 8. The apparatus according to any of claims 3 through 6, wherein a diffraction grating is a high diffraction efficiency blazed grating with a specific degree and wavelength. 9. The apparatus according to claim 8, wherein said diffraction grating is a transmitting blazed grating. 10. The apparatus according to claim 8, wherein said diffraction grating is a reflecting blazed grating. 11. The apparatus according to any of claims 3 through 6, wherein a diffraction grating is a transmitting echelon grating. 12. The apparatus according to claim 1, wherein: said dispersive unit generating the optical path shift is at least one set of parallel plates of a transparent material having refractive index wavelength dispersion; and an amount of the optical path shift and a direction of the optical path shift are varied by changing an angle of the parallel plates with respect to the output light from the lens into the direction perpendicular to the plane including the directions of the lights angular-dispersed by the VIPA. 13. The apparatus according to claim 12, further comprising a control device controlling a temperature of the parallel plates to stabilize the amount of the optical path shift. 14. The apparatus according to claim 1, wherein said dispersive unit generating the optical path shift is at least one prism pair configured by two prisms of transparent materials having refractive index wavelength dispersion, and arranged parallel and point-symmetric with each other, and said unit varying an amount of an optical path shift is a unit for varying space in the prism pair. 15. The apparatus according to claim 1, wherein said dispersive unit generating the optical path shift is at least one prism pair configured by two prisms of transparent materials having refractive index wavelength dispersion, and arranged parallel and point-symmetric with each other, and a direction in which an optical path shift take s place according to a wavelength is inverted by 180°-rotating the prism pair from an optical path where a positive/negative state of a wavelength dispersion slope is changed, and an amount of an optical path shift is varied by changing the space in a diffraction grating pair. 16. The apparatus according to claim 14 or 15, further comprising a control device controlling the temperature of a prism to stabilize the amount of the optical path shift. 17. The apparatus according to claim 14 or 15, wherein a transparent material of parallel plates or a prism is Si, Ge, or GaAs. 18. The apparatus according to claim 1, further comprising a polarization rotation element to compensate for a polarized-wave-dependent loss generated by said unit generating the optical path shift. 19. The apparatus according to claim 1, further comprising: a unit generating an optical path shift by having at least three gratings, and continuously varying a negative wavelength dispersion slope into a positive wavelength dispersion slope or vice versa. 20. A wavelength division-multiplexed light transmission apparatus, comprising: a virtually imaged phased array (VIPA) having a plurality of transmission areas of a wavelength for receiving and outputting light, receiving an input light having a plurality of wavelengths within a continuous wavelength range in the transmission areas, generating a multiple reflection of the input light, forming an output light which is spatially distinguishable from another output light formed for another input light having another wavelength in the continuous wavelength range, generating self-interference, and dispersing the output light in a substantially linear dispersion direction at an output angle depending on each wavelength; a lens converging the output lights formed by the VIPA; a mirror reflecting the converged lights back to the lens, the lens returning a reflected light to the VIPA where the reflected light undergoes a multiple reflection in the VIPA through the transmission areas, the mirror having a shape where a substantially constant wavelength dispersion for each wavelength is given to the output lights from the VIPA and different dispersion is given to the output lights traveling in a direction substantially perpendicular to a plane including directions of lights angular-dispersed by the VIPA; a dispersive unit provided between the lens and the mirror, generating optical path shifts which are substantially parallel to each other for respective wavelengths, in a direction substantially perpendicular to a plane including the directions of the lights angular-dispersed by the VIPA; and a unit varying an amount of an optical path shift, wherein a signal having multiple wavelengths can be simultaneously dispersion-compensated.
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