Patent
Automatic focusing device
Kantani Masashi,Oota Koukei +1 more
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TLDR
In this paper, the authors proposed to make the device compact by substituting the differential or differential circuit of the signal detecting circuit of one-dimensional solid-state image sensing elements with two sample holding circuits, a differential amplifier and an absolute value circuit.Abstract:
PURPOSE:To make the device compact by substituting the differential or differential circuit of the signal detecting circuit of one-dimensional solid-state image sensing elements with two sample holding circuits, a differential amplifier and an absolute value circuit. CONSTITUTION:One-dimensional solid-state image sensing elements 13 such as CCDs are disposed on the image plane of the image 2 by an image lens 1, and are driven by a driving circuit 5 in synchronization with the clock of a pixel clock generator 4, the time series electric signal whereof is inputted to sample holding circuits 6, 7. The sample holding circuits 6, 7 send the signal alternately to a differential amplifier by way of a frequency bisecting circuit 8 by the clock signal from the circuit 4. The differential signal thereof is sent to a microcomputer 13 via an absolute value circuit 10, a peak detector 11, and an AD converter 12. The control signal is sent to a step motor controller 14 in the direction where the peak value is maximum, and focusing is accomplished by way of a step motor 15 and a rack pinion mechanism 16. Thereby, the device is made compact.read more
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Patent
Automatic focusing device
Okitsu Katsuhiko,Imai Ryoichi +1 more
TL;DR: In this article, a sensor consisting of plural light receiving elements arranged in a string shape is used to prevent an incorrect focusing by providing a focus adjustment positioning the sensor at a point based on the maximum counting value out of the changing points of a sensor output found before the focus adjustment.
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Automatic focus device
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TL;DR: In this paper, the focus adjustment of an optical means based on the counting of the changing points of a sensor output at each scanning was performed. But the counting was not considered in this paper.
References
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Patent
Charge transfer type pick up unit
TL;DR: In this paper, the difference signal between the output of the one dimensional solid state pick up unit and noise output was obtained to reduce the fixed pattern noise of the video element outputs in the order of an odd number and even number of line sensor.
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Horiike Mitsunori,Hibi Kenji +1 more
TL;DR: In this article, a memory circuit is used to make comparison and assessment of these contents and drive the focus, which is achieved automatically without depending on manpower by converting the picture signals taken when lenses are at varying distances from specimen respectively to codes and holding the codes in memory circuit.