Small type variable focal length lens

Details Small type variable focal length lens Small type variable focal length lens

1989-04-11

1991-12-10

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359740, 359795, G02B 1500, G02B 904

Patent

active

050712357

ABSTRACT:
A small type zoom lens composed of 3 to 5 lenses, which is suitable for a compact camera. The lens has a telephoto type optical arrangement including a positive first lens unit and a negative second lens unit, both of the lens units being moved forward as a whole while narrowing a space therebetween during variation of power from a short focal end to a long focal end. The first lens unit has an arrangement of refracting powers substantially symmetrical with respect to a diaphragm to correct aberrations produced by the second lens unit composed of a negative single lens.

REFERENCES:
patent: 4015897 (1977-04-01), Konoma et al.
patent: 4124276 (1978-11-01), Okano et al.
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4815830 (1989-03-01), Sato et al.
patent: 4911539 (1990-03-01), Tsunashima et al.
patent: 4932764 (1990-06-01), Simpson, Jr.

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