| 摘要 |
A focusing device for optical systems provided with a rotatable light interrupting plate having a first light passing zone and second light passing zone, an image sensor receiving two kinds of images formed by light bundles having passed through the light interrupting plate and converting the respective light intensity distributions to photoelectric signals, a central operation circuit digital-converting the photoelectric signals from the image sensor, then operating them according to a predetermined evaluating function and able to display the state of focusing and the amount and direction of deviation from the focus position and an image information processing circuit able to feed only proper photoelectric signals from the image sensor to the central operation circuit, in order to be able to detect accurately and with a high sensitivity whether focusing is made or not and to detect the amount and direction of deviation from the focus position. The light interrupting plate may be triangular prism light-shielded in the central part.
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