초록 ▼

Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and refer

Disclosed is an improvement in an automatic focusing system for use with an optical instrument having a focusable objective which is adjustable in response to optical and electronic components of the system for determining object distance of a remote subject by comparing images of scanning and reference optical systems. The scanner of the optical system is driven oscillatably across an angle to detect a subject between infinity and the minimum focus condition of the objective lens. The scanner is adjustable in response to the focus condition of the lens for alignment of the angle scanned with the subject when the lens is in perfect focus by means of an electronic and mechanical interconnecting feedback between the lens focusing ring and the aiming device for the scanning system. The present invention relates to improvements in an automatic focusing system\s for use with an optical instrument having a focusable objective. More particularly, the improvement relates to controlling the focusing system sensitivity in accordance with the various camera conditions which define depth of field e.g. object luminance, film sensitivity, shutter speed, focal length and the like.

대표청구항 ▼

For a camera having an adjustable exposure system, a focusable objective lens, a main lens with a variable focal length and an automatic focusing system including a scanner optical system having a scanner means and a reference optical system wherein images of a remote subject are caused respectively

For a camera having an adjustable exposure system, a focusable objective lens, a main lens with a variable focal length and an automatic focusing system including a scanner optical system having a scanner means and a reference optical system wherein images of a remote subject are caused respectively to impinge on a detector means, the detector means generating an output signal representing the object distance of the subject when the images on the detector are coincident, and including means to compare and relate the orientation of said scanner system and the focus condition of the objective lens and means to set the lens opening in accordance with the available light from the subject, the improvement in a means to adjust the focus of the objective lens to the object distance comprising: reference means on said objective lens adjustable in response to variations in focus condition of said lens and for signaling the position of said lens, means supporting the scanner means for movement thereof, means on said scanner supporting means for engagement with said objective lens focus condition reference means for positioning of said supporting means in response to variations in said lens, scanner driver means for driving said scanner means oscillatably, electronic circuit means connected to said detector means and said reference means for periodically comparing the timing of said output signals therefrom and for issuing control signals relative to the position of the subject and the position of the range of said scanner oscillation, and means coupled to said variable main lens and said exposure system to vary the periodicity of said comparison in accordance with the effective focal length of said main lens and the opening of said adjustable exposure system to sensitive said automatic focus adjustment in accordance with the relative condition of depth of field of said camera.