| 摘要 |
PURPOSE:To automatically measure the direction of the major axis and the radius of curvature, by projecting a luminance point to a body to be inspected from two pairs of projecting optical systems disposed at a position with axis symmetry to an optical axis of an objective lens and forming the image of the luminance point on a photoelectric transducer via the objective lens. CONSTITUTION:A light from two pairs of light sources 1a, 1b and 1c, 1d disposed at a position of axis symmetry to an optical axis 0 of an objective lens 4 is projected on an eye E1 to be tested on optical axes O1-O4 via pin hole plates 2a-2d and collimator lenses 3a-3d as a spot. The reflected light of the four luminance points is reflected to a half mirror 5 via the objective lens 4 and formed on a focus plate 8 via an aperture 6 and a lens 7 and observed with an eye E2. On the other hand, the light transmitted from the half mirror 5 is made incident to photoelectric transducers 17 and 18 through a slit of a chopper 16 via an aperture 10, a lens 11, a half mirror 12, and prisms 13 and 14, and from the output pulse signals, the direction of the major axis and the radius of curvature can be obtained automatically with an operation device. |
