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热词
    • 8. 发明授权
    • Zooming control apparatus for a camera
    • 照相机变焦控制装置
    • US5148201A
    • 1992-09-15
    • US704974
    • 1991-05-23
    • Takao UmetsuShunji Nishimura
    • Takao UmetsuShunji Nishimura
    • G02B7/08G02B7/10G03B5/00
    • G02B7/102
    • A zoom lens is zoomed selectively in either of two opposite directions by a motor which is rotated by a driver. First and second zoom switches cause the zoom lens to move at a higher speed. Third and fourth zoom switches cause the zoom lens to move at a lower speed for precisely stopping the zoom lens. A CPU connected to the four switches controls a zoom motor to rotate selectively at higher and lower speeds. The first and third zoom switches cause the zoom lens to move in the direction of telephotography, while the second and fourth zoom switches cause the zoom lens to move in the direction of wide-angle photography. In order to keep the speed of the zoom lens unchanged despite the difference in its direction, an electric current of a larger electric power is applied to the motor for rotation in the direction that requires more work.
    • 变焦镜头通过由驾驶员旋转的电动机选择性地在两个相反的方向上变焦。 第一和第二缩放开关使变焦镜头以更高的速度移动。 第三和第四缩放开关导致变焦镜头以较低的速度移动,以精确地停止变焦镜头。 连接到四个开关的CPU控制变焦电机以更高和更低的速度选择性地旋转。 第一和第三变焦开关使得变焦镜头沿长焦摄影方向移动,而第二和第四变焦开关使变焦镜头沿广角摄影方向移动。 为了保持变焦透镜的速度不变,尽管其方向不同,但是在需要更多工作的方向上,电动机施加较大电力的电流以旋转。