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    • 8. 发明授权
    • Focus servo control device for an optical system having an initial focus
locking operation
    • 具有初始聚焦锁定操作的光学系统的聚焦伺服控制装置
    • US4544837A
    • 1985-10-01
    • US452456
    • 1982-12-23
    • Megumi TanakaRyuichi Naito
    • Megumi TanakaRyuichi Naito
    • G02B7/28G11B7/085G11B7/09G11B7/12
    • G11B7/0908G11B7/0917G11B7/0945G11B2007/0919
    • A focus servo control device for an optical system having a focus servo loop including an objective lens movable between a nearest position and a farthest position relative to an object, and a focus error signal generator for producing a focus error signal including at least first and second in-focus signals, the first in-focus signal corresponding to a shorter one of two distance values between the objective lens and the object at which the first and second in-focus signals are generated and indicating a real in-focus state. The device is constructed to open the focus servo loop and move the objective lens from the farthest position to the nearest position, and then to move the objective lens from the nearest position to the farthest position, while monitoring the focus error signal, and closes the focus servo loop upon receipt of the first in-focus signal, thereby preventing a malfunction of the focus servo loop which might occur by locking the objective lens at a false in-focus position.
    • 一种用于光学系统的聚焦伺服控制装置,其具有聚焦伺服回路,该聚焦伺服回路包括可在相对于物体的最近位置和最远位置之间移动的物镜;以及聚焦误差信号发生器,用于产生至少包括第一和第二 对焦信号,第一对焦信号对应于物镜和物体之间的两个距离值中较短的一个,在该物体处产生第一和第二对焦信号,并且指示实际的对焦状态。 该设备被构造为打开聚焦伺服环路,将物镜从最远位置移动到最近的位置,然后将物镜从最近的位置移动到最远位置,同时监视聚焦误差信号,并关闭 在接收到第一对焦信号时聚焦伺服回路,从而防止通过将物镜锁定在假对焦位置而可能发生的聚焦伺服环路的故障。