Optical: systems and elements – Lens – With variable magnification
Patent
1998-08-26
2000-04-04
Ben, Loha
Optical: systems and elements
Lens
With variable magnification
359698, 396241, 396275, 396 79, 396 85, G02B 1514
Patent
active
060468637
ABSTRACT:
In a lens control apparatus, the performance does not deteriorate even if a filter is inserted and removed. Correction amounts of a focusing lens position which are necessary to eliminate an out-of-focus that is caused when, for example, a filter is inserted are actually measured at several zooming positions such as zm0, zm1, zm2, and zm3 and the results are stored into a predetermined memory such as an ROM or the like in a CPU 36 with respect to a position control of a lens. A correction amount when the filter is inserted at an arbitrary zooming position is calculated by a polygonal line approximation based on correction amounts at the several zooming positions. By adding this correction amount to the focusing lens position which is calculated in accordance with separately stored zoom tracking curve data when the filter is removed, a correct in-focus state can be obtained even when the filter is inserted.
REFERENCES:
patent: 3601021 (1971-08-01), Easterly
patent: 3987461 (1976-10-01), Kondo
patent: 5185669 (1993-02-01), Kato
patent: 5272567 (1993-12-01), Inoue
patent: 5854711 (1998-12-01), Kaneda
Ben Loha
Frommer William S.
Sony Corporation
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