| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fundus photography apparatus which achieves downsizing and cost reduction with a simple structure, facilitates optical adjustment, and allows a user to perform satisfactorily simultaneous stereoscopic photography of the fundus. <P>SOLUTION: A photographing diaphragm 12 has openings 12a and 12b disposed at a position P substantially conjugate to the anterior ocular segment of the eye being examined. The photographing diaphragm is arranged on an object-side focal plane of an image-forming lens 13, and a lattice barrier 15 is arranged on an image-side focal plane of the image-forming lens. A fundus image is guided via the lattice barrier to an imaging plane of an imaging CCD 16. In the apparatus, the photographing diaphragm 12, the image-forming lens 13, the lattice barrier 15 and the CCD 16 are moved as a unit for focus adjustment. With such a configuration, the photographing diaphragm is always positioned on the object-side focal plane of the image-forming lens 13, and the optical system is kept telecentric even when the focus is adjusted in accordance with the diopter of the eye being examined. This eliminates a phenomenon of a stereoscopic view that becomes more concave or convex in the periphery of a screen. In addition, crosstalk of the right and left fundus images on an imaging plane is eliminated by arranging the lattice barrier, and a good fundus image for stereoscopic viewing is obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT |
