| 摘要 |
PURPOSE:To select three kinds of focal distances with rapid operation by disposing a rotatable wide angle unit and a standard/telephotographic system unit on an optical axis, and mechanically combining rotational positions. CONSTITUTION:A gear cam disk 17 inside a driving mechanism provided outside a cover board 9 has a hole to, receive a boss 9a provided on the board 9, and can rotate centering the boss 9a. On the external periphery of the disk 17, a tooth profile part 29 is provided on a position by which it comes the top in the case the unit 10 is on 0 deg. condition; and on the external periphery of a connecting gear 22, a tooth profile part 30 is provided on a position by which it comes the top in the case the unit 11 is on 0 deg. condition, respectively. The connecting gear 22 is rotated by the mutual engagement of the tooth profile parts 29 and 30. The unit 10 functions as a wide angle lens on the 0 deg. condition, and the unit 11 functions as a standard lens on the 0 deg. condition, and functions as a telephoto lens on 180 deg. condition, respectively. |
