Zoom lens adjustment method

Details Zoom lens adjustment method Zoom lens adjustment method

1998-11-24

1999-10-26

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359694, 359700, 396 81, 396 91, 396104, 396379, 396554, G02B 1514, G02B 710, G03B 1700

Patent

active

059738553

ABSTRACT:
A zoom lens adjustment method capable of being applied to zoom lenses for use in video cameras, electronic still cameras, or the like employing solid-state image sensors. An amount of integral movement .delta.1 by which a first lens group (G1) and a second lens group (G2) must axially move from an extreme-wide-angle-state (W) reference positions to cause the actual and reference image planes (IPA and IPR) to coincide is determined. Then, an amount of additional movement .delta.2 by which only the first lens group must be moved to cause the actual and reference image planes to coincide after causing the first and second lens groups to move in integral fashion by the amount .delta.1 when in the extreme-telephoto-state reference positions is determined. Then, from the values of .delta.1 and .delta.2, amounts of positional correction P1 and P2 of first and second lens groups, respectively, from respective reference positions in one of the focal length states between the extreme wide-angle and extreme telephoto states are established. These positional corrections are then applied to the lens groups to reduce or eliminate the positional misalignment between the actual and reference object planes.

REFERENCES:
patent: 4281907 (1981-08-01), Kamata
patent: 4618253 (1986-10-01), Arai
patent: 5089841 (1992-02-01), Yamada
patent: 5422699 (1995-06-01), Sato et al.
patent: 5680255 (1997-10-01), Imanari
patent: 5867217 (1999-02-01), Okino et al.

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