Variable focal length optical system

Details Variable focal length optical system Variable focal length optical system

1996-05-20

1998-02-10

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

057175268

ABSTRACT:
An optical system includes, in the following order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a negative refractive power, a fourth lens unit having a positive refractive power, a fifth lens unit having a positive refractive power, and a sixth lens unit having a negative refractive power. At least the first and sixth lens units move toward the object side upon changing the focal length from the maximum wide-angle state to the maximum telephoto state in such a way that the gap between the first and second lens units increases, the gap between the third and fourth lens units decreases, and the gap between the fifth and sixth lens units decreases.

REFERENCES:
patent: 5126883 (1992-06-01), Sato et al.
patent: 5532881 (1996-07-01), Nakatsuji et al.

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