| 摘要 |
A vertical plane counter-balancing structure for a camera includes a device for fixing a camera, a support, a first pulley system including first and second pulleys, an elastic device, a first rope or cable connected between the elastic device and the support over the first pulley, and a second rope or cable connected between the elastic device and the support over the second pulley. The first and second pulleys have axes that are offset from one another and that are movable in a vertical direction. The first rope or cable compresses the elastic device when the support inclines at an angle between 0 and -90° with respect to the vertical direction, and the second rope or cable compresses the elastic device when the support inclines at an angle between 0 and +90° with respect to the vertical direction. A pair of fixed pulleys (i.e., a third pulley and a fourth pulley) can be provided between the elastic device and support such that the first rope or cable winds around the third pulley and the second rope or cable winds around the fourth pulley.
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