초록 ▼

An automatic focussing arrangement, incorporated in a system in which an optical image is focussed onto a plane, comprises a sensor assembly located in the region of the plane to sense the image. The sensor assembly comprises at least two arrays of sensor devices, one array of sensor devices being i

An automatic focussing arrangement, incorporated in a system in which an optical image is focussed onto a plane, comprises a sensor assembly located in the region of the plane to sense the image. The sensor assembly comprises at least two arrays of sensor devices, one array of sensor devices being in front of the plane, and the second array of sensor devices being behind the plane. Means are provided for moving the image relative to the sensor assembly or for moving the sensor assembly relative to the image. From the first and second arrays signals are derived representative of the image received by the said sensor devices. A focus drive signal to maintain the focus of the arrangement as desired is derived from the signals.

대표청구항 ▼

An automatic focussing arrangement, incorporated in a system which an optical image is focussed on to a focus plane, comprising a sensor assembly, located in the region of the focus plane to sense the image, the sensor assembly comprising at least two arrays of sensor devices, one array of sensor de

An automatic focussing arrangement, incorporated in a system which an optical image is focussed on to a focus plane, comprising a sensor assembly, located in the region of the focus plane to sense the image, the sensor assembly comprising at least two arrays of sensor devices, one array of sensor devices being in front of the focus plane, and the second array of sensor devices being behind the focus plane, means being provided for effecting relative movement between the image and the sensor assembly, so that the sensor assembly may be sequentially exposed directly to different parts of the image, means being provided for deriving from the first and second array signals representative of the image received by the said sensor devices, and for deriving, from signals generated from the first array when exposed to a predetermined part of the image, and from the second array when exposed to the predetermined part of the image, a focus drive signal to maintain the focus of the arrangement as desired.