Patent ID: 6236453
Filing Date: 2001-05-22
Classification: G01M

Abstract:
A lens meter comprising:a light source for generation of a measuring light beam;a normal measuring mode for obtaining and displaying lens characteristic values by measuring a narrow area of an eyeglass lens, the narrow area of said eyeglass lens alone being measured and resultant values being displayed based on an image of a central pattern formed by a first transmitted measuring light beam passed through the narrow area of said eyeglass lens;a wide-area measuring mode for measuring a wide area of said eyeglass lens and thereafter performing mapping display based on a second transmitted measuring light beam which has passed through the wide area of said eyeglass lens;means for switching the order of said normal measuring mode and said wide area measuring mode;a lens receiver for setting the eyeglass lens, said lens receiver being provided in an optical path of the measuring light beam and having a support plate and a lens receiving cylinder, the support plate including the central pattern for measuring the narrow area of the eyeglass lens, and a plurality of peripheral patterns for measuring the wide area of the eyeglass lens, the central pattern being formed inside the lens receiving cylinder, the peripheral patterns being formed outside the lens receiving cylinder; anda processing circuit for computing a degree distribution based on the lens characteristics at each position on the wide area by a great number of images of the peripheral patterns.