초록 ▼

A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point of maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Such inc

A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point of maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Such incidence is achieved by causing the transmitted beam to diverge by moving the transmit optical fiber to a point in front of the focal plane of the transmit telescope until at least a portion of the beam is incident upon the receive optical fiber. The transmit telescope and/or the receive telescope (or, alternatively, only the respective optical fibers of those telescopes) are then moved such that the point of maximum received power for that degree of divergence is incident upon the receive optical fiber. The transmit optical fiber, in response to received power measurements at the receive telescope, then incrementally moves back toward the focal plane of the transmit telescope thereby reducing the degree of divergence and achieving a greater signal per unit area at the receive telescope. As the divergence is reduced, the position of the either the transmit telescope and/or the receive telescope (or, respectively, the optical fibers) is incrementally adjusted to maximize the received power of the received signal which is incident upon the receive optical fiber for each degree of divergence. By monitoring received signal power this iterative process continues until the transmit and receive telescopes are aligned such that the transmitted beam is focused so as to maximize the received power that is incident upon the receive optical fiber.

대표청구항 ▼

A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point of maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Such inc

A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point of maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Such incidence is achieved by causing the transmitted beam to diverge by moving the transmit optical fiber to a point in front of the focal plane of the transmit telescope until at least a portion of the beam is incident upon the receive optical fiber. The transmit telescope and/or the receive telescope (or, alternatively, only the respective optical fibers of those telescopes) are then moved such that the point of maximum received power for that degree of divergence is incident upon the receive optical fiber. The transmit optical fiber, in response to received power measurements at the receive telescope, then incrementally moves back toward the focal plane of the transmit telescope thereby reducing the degree of divergence and achieving a greater signal per unit area at the receive telescope. As the divergence is reduced, the position of the either the transmit telescope and/or the receive telescope (or, respectively, the optical fibers) is incrementally adjusted to maximize the received power of the received signal which is incident upon the receive optical fiber for each degree of divergence. By monitoring received signal power this iterative process continues until the transmit and receive telescopes are aligned such that the transmitted beam is focused so as to maximize the received power that is incident upon the receive optical fiber. ght; a collector lens system to convert said light from said light source into substantially parallel light flux; an aperture diaphragm; a light source image forming lens system having a variable finite focal distance to condense said substantially parallel light flux from said collector lens system and form an image of said light source in the vicinity of said aperture diaphragm; a pupil relay lens system to re-form said image of said light source formed in the vicinity of said aperture diaphragm in the vicinity of a pupil plane of an object lens system; and a field stop being provided between said aperture diaphragm and said pupil plane of said objective lens system, wherein said light source image forming lens system varies a protection magnification of a ratio of the size of said re-formed image of said light source in the vicinity of said pupil plane of said objective lens system to the size of said light source by changing said focal distance of said light source image forming lens system, wherein said light source image forming lens system comprises in order from the side of said light source: a first lens group with positive refracting power; a second lens group with negative refracting power; and a third lens group with a positive refracting power, and wherein at least said second lens group is shifted along an optical axis to vary said focal distance of said light source image forming lens system successively. 2. A microscope episcopic illumination device as claimed in claim 1, wherein said light source image forming lens system has a plurality of light source image forming lens units, said focal distance of said light source image forming lens system being varied by selectively loading and unloading each of said light source image forming lens units in a light path. 3. A microscope comprising: a microscope episcopic illumination device having a light source to supply light; a collector lens system to convert said light from said light source into substantially parallel light flux; an aperture diaphragm; a light source image forming lens system having a variable finite focal distance to condense said substantially parallel light flux from said collector lens system and form an image of said light source in the vicinity of said aperture diaphragm; a pupil relay lens system to re-form said image of said light source formed in the vicinity of said aperture diaphragm in the vicinity of a pupil plane of an object lens system; and a field stop being provided between said aperture diaphragm and said pupil plane of said objective lens system, wherein said light source image forming lens system varies a projection magnification of a ratio of the size of said re-formed image of said light source in the vicinity of said pupil plane of said objective lens system to the size of said light source by changing said focal distance of said light source image forming lens system; at least a camera port to mount an electronic camera; a light path switching member to switch a light path of light from a specimen in order to direct said light from said specimen either to said camera port or to an eyepiece portion; a drive unit to vary said focal distance of said light source image forming lens system; and a controller to control said drive unit, wherein said controller controls said drive unit to set said projection magnification based on the size of an image pick-up surface of said electronic camera mounted on said camera port. 4. An microscope as claimed in claim 3 wherein said controller controls said light path switching member to direct said light from said specimen to said camera port and controls said drive unit. 5. A microscope as claimed in claim 4, comprising: a detector to detect that said electronic camera is mounted on said camera port, wherein said controller controls said light path switching member in accordance with the detection result of said detector. 6. A microscope episcopic ill umination device comprising: a light source to supply light; a collector lens system to convert said light from said light source into substantially parallel light flux; an aperture diaphragm; a light source image forming lens system having a variable finite focal distance to condense said substantially Parallel light flux from said collector lens system and form an image of said light source in the vicinity of said aperture diaphragm; a pupil relay lens system to re-form said image of said light source formed in the vicinity of said aperture diaphragm in the vicinity of a pupil Diane of an object lens system; and a field stop being provided between said aperture diaphragm and said pupil plane of said objective lens system, wherein said light source image forming lens system varies a protection magnification of a ratio of the size of said re-formed image of said light source in the vicinity of said pupil plane of said objective lens system to the size of said light source by changing said focal distance of said light source image forming lens system, wherein a lens barrel of said light source image forming lens system is constituted of a first lens barrel and a second lens barrel, wherein said first lens barrel has a zoom operating ring rotatable around an optical axis to change said projection magnification, and wherein said second lens barrel has an indication ring to set said projection magnification, said indication ring having the size of said image pick-up surface of said electronic camera indicated. 7. A microscope episcopic illumination device comprising: a light source to supply light; a collector lens system to convert said light from said light source into substantially parallel light flux; an aperture diaphragm; a light source image forming lens system having a variable finite focal distance to condense said substantially parallel light flux from said collector lens system and form an image of said light source in the vicinity of said aperture diaphragm; a pupil relay lens system to re-form said image of said light source formed in the vicinity of said aperture diaphragm in the vicinity of a pupil plane of an object lens system; and a field stop being provided between said aperture diaphragm and said pupil plane of said objective lens system, wherein said light source image forming lens system varies a projection magnification of a ratio of the size of said re-formed image of said light source in the vicinity of said pupil plane of said objective lens system to the size of said light source by changing said focal distance of said light source image forming lens system, and wherein said light source image forming lens system has a plurality of light source image forming lens units, said focal distance of said light source image forming lens system being varied by selectively loading and unloading each of said light source image forming lens units in a light path.