| 摘要 |
<p>An optical device is described comprising a lens turret (9) rotatable around an axis, a plurality of lenses (30, 31, 32) mounted around said axis on said turret (9), an adjusting gear (27, 28, 29) on at least one lens (30, 31, 32) and drive means (23, 45, 26) for rotating said lens turret (9) and said adjusting gears (27, 28, 29), said drive means (23, 45, 26) comprising a shaft (45) rotatable in both directions of rotation and coinciding with said rotation axis and carrying a drive gear (26) engaging said adjust- ing gears (27, 28, 29), said optical device being characte- ized in that at least one of the adjusting gears (27, 28, 29) cooperates with a stop fixed with respect to said lens turret (9) for restricting rotation of said at least one adjusting gear (27, 28, 29) in at least one direction of rotation. Preferably only one drive gear (26) is provided which ) drive gear (26) at any moment engages every adjusting gear (27, 28, 29).</p> |
