Invention Grant
US08526128B2 Image-forming lens, and camera device and portable information terminal device with the image-forming lens
有权
图像形成透镜,以及具有图像形成透镜的相机装置和便携式信息终端装置
- Patent Title: Image-forming lens, and camera device and portable information terminal device with the image-forming lens
- Patent Title (中): 图像形成透镜,以及具有图像形成透镜的相机装置和便携式信息终端装置
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Application No.: US13162025Application Date: 2011-06-16
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Publication No.: US08526128B2Publication Date: 2013-09-03
- Inventor: Takashi Kubota , Kazuyasu Ohashi
- Applicant: Takashi Kubota , Kazuyasu Ohashi
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-137482 20100616; JP2010-137492 20100616; JP2011-118460 20110526
- Main IPC: G02B9/06
- IPC: G02B9/06

Abstract:
An image-forming lens includes: from an object side to an image side in order, a first group with a positive refractive power which includes less than or equal to five lens elements of two negative lenses and equal to or more than two positive lenses and in which a first lens element on a most object side is a negative meniscus lens a convex surface of which faces the object side; an aperture; and a second group with a positive refractive power which includes less than or equal to five lens elements including at least one cemented lens of a positive lens and a negative lens; wherein each of the first group and the second group shifts independently to perform focusing to a limited object distance, and an interval between the first lens element and a second lens element close to a surface on the image side of the first lens element: d11-2 and an interval between the second lens element and a third lens element close to a surface on the image side of the second lens element: d12-3 satisfy Conditional Expression A: 0.0
Public/Granted literature
Information query