Device for measuring refractive characteristic of optical system

Abstract

Abstract PURPOSE:To obtain the refracting characteristics of a lens to be checked, by detecting at least five points in a projected patterns, and computing the deflection of the projected luminous fluxes or deformed quantity. CONSTITUTION:The light from a light source 1 is inputted to the lens to be checked 3 via a collimator lens 2. Said lens to be checked 3 is separated from the optical axis of the lens 2 by a specified distance. Immediately behind the lens to be checked 3, is arranged a mask 4 having a circular opening 4a. A linear sensor 5 is arranged within the shortest focus range in the direction of the optical axis. Immediately before the sensor 5, is arranged a mask 6 having three linear slits 6a-6c. The linear sensor 5 is rotated by a motor 7. At the positions, where the slits 6a-6c are coincided, two points in the luminous fluxes through the circular opening 4a of the mask 4 are detected. Altogether six point informations are given. The detected signal is given to an operating circuit 9 via an amplifier 8, and the value indicating the refracting power of the lens to be checked 3 is displayed on a display 10.

Inventors

• 👤 Hiroshi Tamaki

Bibliographic Details