Systems for automatic generation of focusing signals

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Mountings, adjusting means, or light-tight connections, for optical elements > Systems for automatic generation of focusing signals

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• G02B 7/282
• G02B 7/285
• G02B 7/287
• G02B 7/30 using parallactic triangle with a base line
• G02B 7/34 using different areas in a pupil plane
• G02B 7/36 using image sharpness techniques
• G02B 7/40 using time delay of the reflected waves, e.g. of ultrasonic waves