APERTURE CORRECTING MECHANISM

PURPOSE:To correct an aperture with a simple structure, by turning members, whose extents of movement in the direction of the optical axis are different in case of zooming, in an aperture mechanism incorporated in a zoom lens. CONSTITUTION:A driving ring 10, a barrel 11, and a fixed aperture ring 14...

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1. Verfasser: HAISHI YASUYUKI
Format: Patent
Sprache:eng
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Zusammenfassung:PURPOSE:To correct an aperture with a simple structure, by turning members, whose extents of movement in the direction of the optical axis are different in case of zooming, in an aperture mechanism incorporated in a zoom lens. CONSTITUTION:A driving ring 10, a barrel 11, and a fixed aperture ring 14 have pins fitted to grooved 9b, 9c, and 9d of an inside helicoid ring 9 which is moved in the direction of the optical axis by zooming. Pins of the barrel 11 and the fixed aperture ring 14 are fitted to grooves 10c and 10b of the driving ring 10 also. In case of zooming, the driving ring 10 is rotated by the groove 9b, and the barrel 11 and the fixed aperture ring 14 are led by grooves 10c and 10b and are moved in the direction of the optical axis with a differential length (l2-l3) and are turned relatively at theta2, thus correcting the aperture position and the aperture diameter.