G - Physics – 01 – J
Patent
G - Physics
01
J
354/25
G01J 1/36 (2006.01) G02B 7/30 (2006.01)
Patent
CA 1106063
ABSTRACT OF THE DISCLOSURE A camera lens forms an image of an object on an image plane. First and second mirrors produce respective first and second de- tection images of the object on respective first and second arrays of light sensors. These arrays form portions of an integrated circuit chip. One of the mirrors is moved throughtout a scanning period to move its image on the corresponding array. A signal processing circuit receives the outputs of the light sensors and produces an output signal which experiences peaks for certain posi- tions of the moved mirror. A circuit which receives the output signal produces a pulse for each peak which is larger than all previous peaks in the scanning period. One of the mirror positions causes the light distributions of the images to be in best corres- pondence on the arrays. This mirror position represents the existing object distance and produces a maximum one of the peaks, whereby this position produces the last pulse to be produced in the scanning period. The mirror position which produces this last pulse is represented by the position of a mechanical element or by the value of a mirror signal. A spring or an electric motor moves the lens into a final position which corresponds to the element position or to the mirror signal. This position of the lens thus corresponds to the existing object distance, and causes the image of the object to be in focus on the image plane. Each scanning period and automatic focusing operation may be produced on an individual basis on demand, or these periods may be produced in rapid succession to provide continuous automatic focusing operation. - 2 -
280441
Honeywell Inc.
Smart & Biggar
LandOfFree
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