| 摘要 |
PURPOSE:To obtain a refractivity measuring apparatus free of a moving part, by measuring on an observation plane a beam position which passed through different positions of a lens to be tested and then calculating a refractivity. CONSTITUTION:The first aperture 6 is provided with 2 linear openings 8 set through an angle of 90 deg. agaist each other as shown and a line sensor 7 with a number of light sensors arranged in a vertical direcion to the paper. And now, considering a flux of rays emitted from a small opening A0 of the second aperture 4, when there is no lens S subjected to testing, it does not lend itself to be refracted and, a ray of light 8' which passed through the linear opening 8 of aperture 6 flashes on the sensor 7 causing a signal to be generated in the positions J, K on the sensor 7. Next,a changes of co-ordinates of the ray of light 8' on the sensor 7 due to introduction of the test lens S into the light path correspond to the changes of points of intersections from O to O' and the calculation can be effected when co-ordinates of center point of JK and distance between J and K become available. |
