Automatic measuring of lens parameters using parallel radiation beam

摘要

The measurement is carried out in steps. First the parallel radiation beam (SB) penetrates through the front surface of the lens (LX), and following the reversal of the lens, through its rear surface, and impinges after leaving the rear surface of the lens or after the reversal of the lens from its front surface, on a diaphragm (RB). The light passing through the diaphragm impinges on the radiation receiver (EE), which produces a first or a second measurement signal value, determining the distance between the back lens and the image. The parallel radiation beam impinges firstly on a diaphragm (RB) and then penetrates the front surface of the lens under test. The light leaving the rear surface of the lens impinges on the radiation receiver, which produces a third measurement value, determining the focal length.