Image pickup lens unit and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9632277-B2
Application number	US-201214007184-A
Country	US
Kind code	B2
Filing date	Mar 27, 2012
Priority date	Mar 28, 2011
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A small, high-performance image pickup lens unit having an IR cut filter that can be incorporated reliably therein while avoiding an increase in processing complexity. A sealing portion 14 is disposed between a lens 11 and an IR cut filter 12 in order to seal an internal space IS sandwiched between the lens 11 and the IR cut filter 12 , and therefore a holder 40 can be molded integrally with the lens 11 and the IR cut filter 12 incorporated therein while preventing liquid resin MP from flowing in between the lens 11 and the IR cut filter 12 . By molding the holder 40 integrally with the lens 11 and the IR cut filter 12 incorporated therein in this manner, an image pickup lens unit 100 can be reduced in size, and reductions in the number of components and the number of assembly man-hours can be achieved.

First claim

The invention claimed is:

1. A manufacturing method for an image pickup lens unit including a lens, a filter, and a holder that holds the lens and the filter in an interior thereof, the manufacturing method comprising the steps of:
attaching the lens to a first mold so as to be positioned on the first mold which is in an open condition;
attaching the filter to a second mold so as to be positioned on the second mold which is in an open condition;
closing the first and second mold to form an internal space sandwiched between the lens and the filter and a molding space on a periphery of the lens and the filter; and
molding a holder member that holds the lens and the filter in an interior thereof by charging a resin into the molding space and hardening the resin.

2. The manufacturing method for an image pickup lens unit according to claim 1 , wherein when the molding space is formed on the periphery of the lens and the filter, a sealing portion for sealing the internal space sandwiched between the lens and the filter is disposed between the lens and the filter.

3. The manufacturing method for an image pickup lens unit according to claim 1 , wherein at least one of the first mold and the second mold includes a displacement mechanism for adjusting a position of at least one of the lens and the filter in a mold opening/closing direction.

4. The manufacturing method for an image pickup lens unit according to claim 1 , wherein the first mold includes a first fixing mechanism that suctions the lens using negative pressure in order to hold the lens and the second mold includes a second fixing mechanism that suctions the filter using negative pressure in order to hold the filter.

5. The manufacturing method for an image pickup lens unit according to claim 1 , wherein the first mold includes a first positioning holding portion for positioning the lens relative to the mold while attaching the lens and the second mold includes a second positioning holding portion for positioning the filter relative to the mold while attaching the filter.

6. The manufacturing method for an image pickup lens unit according to claim 1 , wherein the lens and the filter are positioned and attached to the first mold and the second mold in an open condition using an attachment jig, respectively.

7. The manufacturing method for an image pickup lens unit according to claim 1 , wherein in order to hold a first lens and a second lens in the interior of the holder, the first lens is attached to the first mold in an open condition and a temporary assembly of the second lens and the filter is attached to the second mold in the open condition, whereupon the first mold and the second mold are closed and clamped such that the first lens contacts the second lens.

8. The manufacturing method for an image pickup lens unit according to claim 1 , wherein the holder is formed from at least one of LCP resin and PPA resin.

Assignees

• Akutsu Dai
• Mori Hajime
• Miyazaki Takemi
• Konica Minolta Inc

Inventors

• Akutsu Dai
• Mori Hajime
• Miyazaki Takemi

Classifications

• G02B7/006 Primary

  Filter holders · CPC title

• G02B7/022

  lens and mount having complementary engagement means, e.g. screw/thread · CPC title

• B29D11/0074

  Production of other optical elements not provided for in B29D11/00009- B29D11/0073 · CPC title

• G02B7/021

  for more than one lens · CPC title

• G02B7/02 Primary

  for lenses {(supports for magnifying lenses G02B25/002)} · CPC title