发明名称 Variable magnification finder and imaging apparatus
摘要 The magnification of the variable magnification finder is switchable, and the finder includes a positive lens group, a negative lens group, and an eyepiece lens group in this order from an object side in a high magnification state. The positive lens group is retracted from an optical path of the variable magnification finder to the outside of the optical path and the negative lens group moves toward the object side when magnification is changed from the high magnification state to a low magnification state. The following conditional formula is satisfied when the focal length of the negative lens group is fN: −15 mm<fN<−5 mm.
申请公布号 US9417504(B2) 申请公布日期 2016.08.16
申请号 US201414291607 申请日期 2014.05.30
申请人 FUJIFILM Corporation 发明人 Saito Hiroki
分类号 G03B13/06;G03B13/10;H04N5/232;G02B23/00;G02B13/00;G02B15/16 主分类号 G03B13/06
代理机构 Young & Thompson 代理人 Young & Thompson
主权项 1. A variable magnification finder, the magnification of which is switchable, the finder comprising: a positive lens group having positive refractive power; a negative lens group having negative refractive power; and an eyepiece lens group in this order from an object side in a high magnification state, wherein the positive lens group is retracted from an optical path of the variable magnification finder to the outside of the optical path and the negative lens group moves toward the object side during magnification change from the high magnification state to a low magnification state, and wherein the following conditional formula (1) is satisfied when the focal length of the negative lens group is fN: −15 mm<fN<−5 mm   (1), and wherein the variable magnification finder is a reverse-Galilean finder.
地址 Tokyo JP