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发明授权
US06927926B2 Telephoto lens and telephoto lens apparatus having the same 有权
长焦镜头和远摄镜头设备具有相同的功能

Telephoto lens and telephoto lens apparatus having the same
摘要：
A telephoto lens includes, in order from the object side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a positive refracting power, and a fourth lens unit having a negative refracting power. The second lens unit has a cemented lens composed of a positive lens and a negative lens, and a negative lens. The fourth lens unit has a cemented lens composed of a negative lens and a positive lens, and a negative lens. The telephoto lens satisfies the following conditions: νd>80 −0.5>f4/f>−1.2 where νd is an Abbe's number of a lens having a positive refracting power in the first lens unit, f4 is a focal length of the fourth lens unit, and f is a focal length of the entire optical system.
摘要（中）：

长焦透镜从物体依次包括具有正折射率的第一透镜单元，具有负折射率的第二透镜单元，具有正折射率的第三透镜单元和具有正折射率的第四透镜单元 折射力。 第二透镜单元具有由正透镜和负透镜构成的胶合透镜和负透镜。 第四透镜单元具有由负透镜和正透镜构成的胶合透镜和负透镜。 长焦镜头满足以下条件：<？in-line-formula description =“In-line formula”end =“lead”？> nu 80 <？in-line-formula description = “In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> - 0.5> f -1.2 <？in-line-formula description =“In-line Formulas”end =“tail”？>其中nu 是在第一透镜中具有正折射率的透镜的阿贝数 单位f 4是第四透镜单元的焦距，f是整个光学系统的焦距。

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