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    • 2. 发明授权
    • Automatic film retrieval system and method therefor
    • 自动电影检索系统及其方法
    • US4016406A
    • 1977-04-05
    • US560000
    • 1975-03-19
    • Eiji AbeTakahisa OhtaMitsuharu Urata
    • Eiji AbeTakahisa OhtaMitsuharu Urata
    • G03B21/11G06K17/00G03B23/12G06M3/14
    • G03B21/113G06K17/0019
    • A first counter stores the number of a desired microfilm frame to be located at an access position. A second counter stores the number of the present frame at the access position. The microfilm is normally driven at a high speed, but it is desired to drive the microfilm at a lower speed for a predetermined number of frames prior to the arrival of the desired frame at the access position. This predetermined number is set into a compensating circuit. A comparator first determines the magnitude and sense of the difference between the two counters while the film is stationary. The predetermined number is then added to the contents of the second counter, and the film is driven until the comparator detects a first equality of the contents of the first and second counter, thereby switching the film drive to the lower speed. The predetermined number is then algebriacally added to the contents of the second counter in the opposite sense, so that, when the desired frame reaches the access position, the comparator detects a second equality of the contents of the first and second counter, thereby stopping the film drive.
    • 第一计数器存储要位于访问位置的期望的缩微胶卷框架的编号。 第二计数器存储当前帧在访问位置的编号。 微缩胶片通常以高速驱动,但是期望在期望的帧到达存取位置之前以较低的速度驱动微缩胶片达预定数量的帧。 该预定数量被设置为补偿电路。 比较器首先确定胶片静止时两个计数器之间的差值的大小和感觉。 然后将预定数量加到第二计数器的内容中,并且驱动胶片,直到比较器检测到第一和第二计数器的内容的第一相等,从而将胶卷驱动器切换到较低速度。 然后在相反的意义上,将预定数量代数地添加到第二计数器的内容,使得当期望帧到达访问位置时,比较器检测第一和第二计数器的内容的第二相等,从而停止 电影驱动。