Optical: systems and elements – Lens – With light limiting or controlling means
Patent
1994-12-27
1998-08-11
Sugarman, Scott J.
Optical: systems and elements
Lens
With light limiting or controlling means
359708, G02B 1318
Patent
active
057935394
ABSTRACT:
An optical system for endoscopes which comprises a stop having a variable aperture and is configured so as to produce spherical aberration for preventing an image surface thereof from being shifted in a direction opposite to the object side by narrowing the aperture of the stop, whereby the optical system is free from insufficiency in brightness and degradation in resolution thereof on a side farther from the optical system within a depth of field thereof, and has another side of the depth of field brought close to the optical system.
REFERENCES:
patent: 4902115 (1990-02-01), Takahashi
Hasegawa Akira
Konno Mitsujiro
Matsumoto Shinya
Suzuki Takayuki
Takayama Toshikazu
Olympus Optical Co,. Ltd.
Sugarman Scott J.
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