| 摘要 |
PURPOSE:To permit light manual operation during manual adjusting by providing a driving mechanism consisting of two sets of electromagnetic devices, oscillating bars, etc., moving a lens forward and backward through their changing over and interrupting the driving mechanism at times other than at the automatic focusing. CONSTITUTION:A lens is driven by a helicoid gear 29 via prescribed gear trains by a motor 1. Oscillating levers 12, 13 are provided oscillatably to the shafts 10, 11 of gears 5, 6 out of the gear trains, and gears 7, 8 meshed with the gears 5, 6 are mounted respectively and are changed over with electromagnets 17, 18. To move the lens to a close distance direction with such constitution, the electromagnet 18 is energized to mesh the gears 8, 9 by using the lever 13. To move it in an infinite direction, the electromagnet 17 is energized to mesh the gears 7, 9 of the lever 12. At times other than automatic focusing, the electromagnets 17, 18 are not energized, and the transmission is interrupted by a projection 14 and the toothless parts of the gears 7, 8. Thereby, the light operation is made possible. |
