CANON的一件鏡頭專利 - 專利與產品

Canon EF 28mm f/1.4


這件專利（日本特開2016-031414）被報導為Canon EF 28mm f/1.4的對應專利。


請求項1：


請求項1英文翻譯（日本專利局機器翻）：
[Claim 1] 
having the 2nd lens group of positive refracting power which moves to the image side in order on the occasion of the 1st lens group of immovable negative refracting power, and focusing on the occasion of focusing from the object side -- the 2nd lens group -- the image side from the object side -- order -- the [ of positive refracting power ] -- the [ of 2a group, an aperture diaphragm, and positive refracting power ] -- comprising a 2b group 
facing focusing -- the [ said ] -- the [ 2a group and / said ] -- in an optical system which moves 2b group by a mutually different locus 
When setting a back focus when carrying out the focus of the focal distance of the whole system to f and infinite distance to BF, 
1.0 < BF/f < 3.0 
A becoming conditional expression is satisfied, an Abbe number of material is set to nud, relative partial dispersion is set to thetagF, and it is the abnormal portion dispersibility deltathetagF. 
ΔθｇＦ＝θｇＦ－（－１．６６５×１０－７×νｄ３＋５．２１３×１０－５×νｄ２－５．６５６×１０－３×νｄ＋７．２７８×１０－１）
When carrying out, it is said 2nd lens group, 
0.027 < deltathetagF 
It has a positive lens with which it is satisfied of becoming conditions one or more, and is a positive lens at this time from the object side to order in the image side, Positive lens Gji (i= 1, 2, ..., n) 
When distance on an optic axis from a lens surface on the object side to a lens surface of the aforementioned positive lens Gji makes distance used as the shortest value most Dfji (i= 1, 2, ..., n), 
1.0 < Dfji/f < 4.0 
An optical system satisfying a becoming conditional expression. 

鏡頭光學系統：


相關技術描述：
影像自物體進入鏡頭，經具有固定負折射率的第一透鏡組、與聚焦時可移動的正折射率第二透鏡組、第二透鏡組包括具正折射率第2a群鏡與正折射率的第2b群鏡，聚焦時，第2a群鏡與第2b群鏡沿不同軌跡移動，光學系統的後焦距BF與焦距f比例為"1.0 < BF/f < 3.0"，整個系統表達式為：
ΔθｇＦ＝θｇＦ－（－１．６６５×１０－７×νｄ３＋５．２１３×１０－５×νｄ２－５．６５６×１０－３×νｄ＋７．２７８×１０－１）
其中，Vd為系統色散能力阿貝數（ABBE number）、θｇＦ為部分色散比、ΔθｇＦ為異常部分色散性；
第二透鏡組條件滿足０．０２７  ＜  ΔθｇＦ，從物體到影像的正折射率透鏡順序為Ｇｊｉ（ｉ＝１，２，・・・，ｎ），當光軸距離從物體端鏡片表面到影像端的各正折射率透鏡的距離順序為：をＤｆｊｉ（ｉ＝１，２，・・・，ｎ），距離關係式為：  １．０  ＜  Ｄｆｊｉ／ｆ  ＜  ４．０。

列舉實施例之一：



實施例列表：


my two cents:
報導這篇專利的目的只是好奇這類鏡頭專利的撰寫方式，範圍用數值關係描述，實施例則是鉅細靡遺。


中文介紹：http://www.dcfever.com/news/readnews.php?id=15935

資料來源：
http://www.canonrumors.com/patent-canon-ef-28mm-f1-4/

Ron