| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electronic viewfinder that enables observation of a subject in high definition, and an eyepiece lens system for such an electronic viewfinder. <P>SOLUTION: The eyepiece lens system includes: a first lens 23a having a positive refractive index; a second lens 23b having a negative refractive index; and a third lens 23c having a positive refractive index, wherein the first lens 23a, the second lens 23b, and the third lens 23c are disposed in this order from a side of the reflection type LCD to a side of the last optical surface, and satisfy the conditions: 18 mm<f1<20 mm, -18 mm<f2<-16 mm, 18 mm<f3<20 mm, 19 mm<f<21 mm, and 0≤HH'/f<+0.13, where f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f is a combined focal length of the first to the third lenses, and HH' is distance between a rear principal point H being an optical center of a lens group including the first and second lenses and a front principal point H' being an optical center of a lens group including the second and third lenses. <P>COPYRIGHT: (C)2010,JPO&INPIT |
