JPS5757633A - Plastic lens blank and control of heat compression of the same - Google Patents

Plastic lens blank and control of heat compression of the same

Info

Publication number
JPS5757633A
JPS5757633A JP13158980A JP13158980A JPS5757633A JP S5757633 A JPS5757633 A JP S5757633A JP 13158980 A JP13158980 A JP 13158980A JP 13158980 A JP13158980 A JP 13158980A JP S5757633 A JPS5757633 A JP S5757633A
Authority
JP
Japan
Prior art keywords
lens blank
metallic mold
plastic lens
millimeters
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP13158980A
Other languages
Japanese (ja)
Other versions
JPS6210177B2 (en
Inventor
Masao Takagi
Kiyoshi Wada
Toshiji Sakuma
Hisashi Nichibe
Seiichiro Shimomura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP13158980A priority Critical patent/JPS5757633A/en
Publication of JPS5757633A publication Critical patent/JPS5757633A/en
Publication of JPS6210177B2 publication Critical patent/JPS6210177B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE: To obtain a plastic lens free from air pocket and having a good optical characteristic, in a short processing time, by thermally compressing a plastic lens blank of a particular size in a metallic mold in which temperature and pressure are controlled by a specific manner.
CONSTITUTION: To be prepared is a lens blank (preferably consisting of acrylic resin) 1 which is larger in wall thickness than a finished lens; smaller in outside diameter; larger in curveture; and when brought in contact with a metallic mold 2, a gap G is to become more than 0.1 millimeter at the position where a distance D from the center of the lens blank is 50 millimeters - or G may preferably be 0.2W 0.5 millimeters. And this is formed between two parts of the metallic mold 2 while measuring temperature of the metallic mold and deforming speed of the lens blank and also by controlling temperature, pressure and flow rate of operating hydraulic oil being supplied to the compression cylinder so that they follow the preset values.
COPYRIGHT: (C)1982,JPO&Japio
JP13158980A 1980-09-24 1980-09-24 Plastic lens blank and control of heat compression of the same Granted JPS5757633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13158980A JPS5757633A (en) 1980-09-24 1980-09-24 Plastic lens blank and control of heat compression of the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13158980A JPS5757633A (en) 1980-09-24 1980-09-24 Plastic lens blank and control of heat compression of the same

Publications (2)

Publication Number Publication Date
JPS5757633A true JPS5757633A (en) 1982-04-06
JPS6210177B2 JPS6210177B2 (en) 1987-03-04

Family

ID=15061579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13158980A Granted JPS5757633A (en) 1980-09-24 1980-09-24 Plastic lens blank and control of heat compression of the same

Country Status (1)

Country Link
JP (1) JPS5757633A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0157967U (en) * 1987-10-06 1989-04-11

Also Published As

Publication number Publication date
JPS6210177B2 (en) 1987-03-04

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