US 11,358,311 B2Granted

Optical element and method for manufacturing optical element

AssigneeOtsuka Pharmaceutical Co., Ltd.

InventorsTakehiko Goshima, Yoshihiro Okumura, Hiroshi Umetsu, Seiji Yuasa

Life of this patent

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Abstract

To provide a method for manufacturing an optical element, which improves the surface precision of the optical surface as well as reducing the birefringence at a low cost. A method for manufacturing an optical element 1090A having optical surfaces 1091 and 1092 and a non-optical surface 1093A that is adjacent to the optical surface 1092 via a ridge by injection molding includes forming the non-optical surface 1093A with a mold surface. The mold surface includes a sink forming area 1095 as a first area having a first surface roughness, and a high transfer area 1094 as a second area having a second surface roughness different from the first surface roughness. The second area is located outside the first area.

Claims5

Dependent claims

A method for manufacturing an optical element having an optical surface and a non-optical surface that is adjacent to the optical surface via a ridge by injection molding, the method comprising:

forming the non-optical surface with a mold having a surface that includes a first area having a first thermal conductivity for forming a sink area, and a second area having a second thermal conductivity larger than the first thermal conductivity, the first area having a short side and a long side, the second area having a short side and a long side, and the second area being located between the first area and the optical surface,
wherein a length of the long side of the first area is the same as a length of the long side of the second area, and the long side of the first area is in contact with the long side of the second area in its entirety.

Dependencies are inferred from the claim text.

Facts

Application: 16/427,835Filed 31 May 2019 · division
Priority: JP 2013-05883821 Mar 2013
Published: US 2019/0283290 A119 Sep 2019
Granted: 14 Jun 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B29C 45/0025
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor: preventing…
B29C 45/372
Mould cavity walls , i.e. the inner surface forming the mould cavity, e.g. linings: provided with means for marking or patterning, e.g. numbering…
B29D 11/00644
Production of filters: polarizing
G02B 1/04
Optical elements characterised by the material of which they are made; Optical coatings for optical elements: made of organic materials, e.g. plastics

Family

PCT/JP2014/050510Parent of this division · filed 15 Jan 2014
US 2019/0283290 A1Pre-grant publication · published 19 Sep 2019
Application14/776,303Parent of this division
US 10,369,728 B2Parent of this division
US 2016/0039130 A1Published application
US 11,358,311 B2This patent

From the US filing history. Foreign family members aren’t listed.