Optical: systems and elements – Compound lens system – Telescope
Patent
1990-12-21
1992-06-23
Henry, Jon W.
Optical: systems and elements
Compound lens system
Telescope
359432, 359732, 359676, 359665, 359497, 359492, 359 94, 359 73, 359 70, 359 40, G02B 2302, G02B 2314, G02B 1500, G02B 1306, G02B 2600, G02F 119
Patent
active
051248360
ABSTRACT:
A real image mode optical system includes an objective lens forming an image of an object and an eyepiece for observing the image and is provided with a variable focal length mirror which dispenses with any polarizing plate so that a diopter change can be corrected due to the change of its optical power. Accordingly, the real image mode optical system has many advantages important for practical use that the reduction of the amount of light is slight, the characteristics are little changed by gravity, the number of parts is small with low manufacturing costs, the strain of the lens and the like of the optical system is not viewed, aberrations are little produced, and the effective aperture of the entire optical system can be set at a minimum.
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Henry Jon W.
Olympus Optical Co,. Ltd.
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