METHOD FOR MEASURING A REFRACTIVE FORCE OF A LENS BY USING PROPERTIES OF AN OPTICAL SYSTEM, CAPABLE OF MEASURING A REFRACTIVE FORCE OF A LENS EVEN THOUGH DEVIATION IS EXISTED IN SOME PART OF AN OPTICAL SYSTEM OF A LENS METER

摘要

PURPOSE: A method for measuring a refractive force of a lens by using properties of an optical system is provided to measure an accurate refractive force of a lens even though some among a plurality of light sources is lost or distorted because the refractive force of the lens is measured by considering a direction of and a distance between the light sources becoming reflected to a light measuring sensor by passing through pin holes of a pattern plate and the lens.;CONSTITUTION: A method for measuring a refractive force of a lens by using properties of an optical system is as follows. A lens is not placed in a holder or a lens for setting up in which a refractive force is known in advance is placed. A central position of several light sources becoming received to a light measuring sensor is calculated(S130). A position relation of the refractive force of the lens and light sources becoming received to the light measuring sensor is figured out(S150). An object lens is placed in the holder(S160). The central position of the light sources becoming received to the light measuring sensor is calculated. The refractive force of the object lens is calculated by substituting the calculated central position of the light sources into the position relation of the figured refractive force of the lens and the light sources of the light measuring sensor(S170).;COPYRIGHT KIPO 2012