초록 ▼

This invention presents a range finding device when 1st and 2nd detection images of an object are scanned by signal storing type image sensing means to obtain image scan signals, which are quantized by quantization means to produce quantized image data for said 1st and 2nd detection images. On the b

This invention presents a range finding device when 1st and 2nd detection images of an object are scanned by signal storing type image sensing means to obtain image scan signals, which are quantized by quantization means to produce quantized image data for said 1st and 2nd detection images. On the basis of the thus obtained quantized image data, the location within the 2nd detection images of one set of M successive elements of the 2nd detection image which is most similar to M successive elements of the 1st detection image is detected, and with the aid of the data of this location, the distance between the device and the object is determined. According to this improved device, sequence control means, which controls a series of operations for range finding, will firstly cancel the signals stored in said image sensing means as unnecessary signals, when said series of operations is initiated, and then enables proper storing of image signals in the image sensing means so as to properly control the device.

대표청구항 ▼

A focus control system for automatically focusing objective lens means onto an object, comprising: (A) means for detecting deviation of the adjusted position of the objective lens means from an in-focus position at which the lens means is properly focused onto the object, said deviation detection me

A focus control system for automatically focusing objective lens means onto an object, comprising: (A) means for detecting deviation of the adjusted position of the objective lens means from an in-focus position at which the lens means is properly focused onto the object, said deviation detection means providing data on the deviation; (B) means for driving the objective lens means along an optical axis of the lens means; (C) means for controlling said driving means on the basis of the deviation data provided by said deviation detection means so as to position the objective lens means at the in-focus position; and (D) means for controlling the driving speed of said driving means on the basis of the magnitude of the deviation indicated by the deviation data, said speed control means including means for comparing the magnitude of the deviation with a predetermined threshold, and being arranged to cause said driving means to drive the lens means toward the in-focus position at a speed which is determined by the result of the comparison performed by said comparing means according to a function which provides a stepwise change between two different speed levels, said speed control means further including means for selecting the threshold. A system for discriminating the focusing state of an image forming optical means relative to an object, comprising: (A) first and second sensing means for respectively sensing first and second radiations emanated from the object and for respectively producing first and second electrical indications respectively indicative of distributions of the first and second radiations on said first and second sensing means, the relative positions of the first and second radiation distributions on said first and second sensing means being varied in accordance with the change in the focusing condition of the optical means relative to the object and having a predetermined relation when an in-focus condition of the optical means relative to the object is attained; (B) detecting means for detecting, on the basis of the first and second electrical indications, the relative positions of the first and second radiation distributions on said first and second sensing means, said detecting means providing data representing said relative positions; and (C) discriminating means for discriminating the focusing condition of the optical means relative to the object on the basis of the data representing the relative positions, said discriminating means including means for comparing the data with reference data representing the predetermined relation of the relative positions of the first and second radiation distributions on said first and second sensing means and being arranged to discriminate the focusing condition among the in-focus, near focus, and far focus conditions based on the result of the comparison.