| 发明名称 |
REAL-IMAGE ZOOM FINDER AND IMAGE PICK-UP DEVICE |
| 摘要 |
<p>[Problem] To make a zoom finder thinner in the image pick-up direction without reducing optical performance. [Solution] The present invention comprises the following in the order given, starting from the object side: a variable objective lens group comprising a first lens group (G1) having disposed in order from the object side a negative first group first lens (L11) and reflection member (H1), a positive second lens group (G2) that is moved when changing magnification, and a positive third lens group (G3) that is moved when changing magnification; an upright optical system (20) having a reflective surface for converting an upside down image into a right-side up image; and a positive ocular lens system (30). The present invention satisfies a conditional formula (1): 1.5<U2/U1<3.0. U1 is the distance on the light axis from a lens surface (Sa) on the object side of the first group first lens (L11) at the telephoto end to a lens surface (Sb) of the second lens group (G2) that is arranged closest to the object side. U2 is the difference between the distance of U1 and the distance on the light axis from the lens surface (Sa) on the subject side of the first group first lens (L11) at the wide-angle end to a lens surface (Sc) of the third lens group (G3) that is arranged closest to the image side.</p> |
| 申请公布号 |
WO2013005376(A1) |
申请公布日期 |
2013.01.10 |
| 申请号 |
WO2012JP03916 |
申请日期 |
2012.06.15 |
| 申请人 |
FUJIFILM CORPORATION;SATO, KENICHI |
发明人 |
SATO, KENICHI |
| 分类号 |
G02B15/167;G02B13/18;G02B17/08;G02B25/00;G03B13/06 |
主分类号 |
G02B15/167 |
| 代理机构 |
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