Invention Application
- Patent Title: INNER FOCUSING LENS
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Application No.: US15083670Application Date: 2016-03-29
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Publication No.: US20160291291A1Publication Date: 2016-10-06
- Inventor: Keisuke OMORI
- Applicant: TAMRON CO., LTD.
- Applicant Address: JP Saitama-shi
- Assignee: TAMRON CO., LTD.
- Current Assignee: TAMRON CO., LTD.
- Current Assignee Address: JP Saitama-shi
- Priority: JP2015-069443 20150330
- Main IPC: G02B13/00
- IPC: G02B13/00 ; G02B27/00

Abstract:
An inner focusing lens has sequentially from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a negative refractive power. The first lens group has negative meniscus lenses disposed farthest on the object side thereof. The second lens group is moved along the optical axis whereby focusing from a focus state for an object at infinity to a focus state for the minimum object distance is performed. The inner focusing lens satisfies predetermined conditions and thereby, realizes a compact inner focusing lens having high imaging performance at wide angles, suitable for compact cameras having a function of capturing video.
Public/Granted literature
- US09720208B2 Inner focusing lens Public/Granted day:2017-08-01
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