Lens unit and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-9116345-B2
Application number	US-201314067674-A
Country	US
Kind code	B2
Filing date	Oct 30, 2013
Priority date	Oct 30, 2012
Publication date	Aug 25, 2015
Grant date	Aug 25, 2015

Abstract

A lens unit may include at least four lens groups and a tube-shaped holder holding the lens groups. The tube-shaped holder is provided with a second lens group holding part provided with a protruded part surrounding an outer peripheral end part of the second lens group through a gap space and the protruded part is provided with a caulked part which is deformed so as to cover the outer peripheral end part from the object side. The protruded part may be provided with a thick portion and a thin portion extended to the front side from the thick portion and the thin portion is caulked by being plastically deformed to be the caulked part. After the second lens group is mounted on an inner side to the protruded part, the position of the second lens group is adjusted and then a caulked part is formed.

First claim

What is claimed is:

1. A lens unit for use with an object to be photographed, comprising:
a first lens group;
a second lens group
a third lens group;
a fourth lens group; and
a tube-shaped holder which holds the first lens group, the second lens group, the third lens group, the and fourth lens group;
wherein the first lens group, the second lens group, the third lens group, and the fourth lens group are arranged in sequential order from an object side closest to the obje…

Assignees

• Nidec Sankyo Corp

Inventors

• Komiyama Tadashi
• Shirotori Toshio

Classifications

• G02B9/34 Primary

  Physics · mapped topic

• G02B27/025

  Physics · mapped topic

• G02B27/021 Primary

  Physics · mapped topic

• G02B7/021

  Physics · mapped topic

• Y10T29/49826

  Cross-Sectional Technologies · mapped topic