| 摘要 |
<p>A light beam apparatus for a lighting instrument includes several individual shutter mechanisms (100) arranged radially around the axis of a light beam (3). Each shutter mechanism includes a generally circular shutter blade (10) having a circumference, but with a cut-out or void area such that a portion of the circumference is eliminated. The shutter blade (10) preferably includes at least one straight edge (11) at the boundary of the cut-out or void area, which straight edge passes through the center (111) around which the shutter blade (10) rotates, and is used for intercepting at least a portion of a light beam (3) passing through the light beam shutter apparatus (100). The shutter blade (10) may alternatively include other edge shapes at the boundary of the cut-out or void area, as desired. Driven surfaces (12,13), such as gear teeth or the like, are formed in opposed portions of the remaining circumference. The shutter blade (10) is mechanically coupled to linear driving members (14,15), such as rack gears or the like, which are driven in turn by rotary driving members (16,17), such as pinions or the like. The rotary driving members (16,17) may be driven by motors. Linear-actuating motors may also be used to drive the linear driving members (14,15) in place of rotary motors and rotary driving members (16,17). The shutter mechanism assembly, comprising the several similar shutter mechanisms, may be rotated through a limited range, as desired. <IMAGE></p> |
