| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an eyepiece for finder that enables observation of an image in a large size and with well-corrected coma aberrations and enables diopter adjustment in a sufficiently large range while minimizing increase in the sizes of an image display surface and the eyepiece. <P>SOLUTION: The eyepiece comprises three single lenses arranged from an image display surface side to an observation side: a first positive lens having a strong positive refractive power on the image display surface side; a second lens having a negative meniscus shape with a concave surface on the observation side; and a third lens with a biconvex shape. Diopter is adjusted by integrally moving the three lenses, i.e., the first to third lens, in the optical axis direction so that the relation between the focal length f of the entire eyepiece system and the diagonal length H of a displayed image is appropriately maintained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
