JPS6490716A - Molding device of plastic concave lens - Google Patents

Molding device of plastic concave lens

Info

Publication number
JPS6490716A
JPS6490716A JP24784387A JP24784387A JPS6490716A JP S6490716 A JPS6490716 A JP S6490716A JP 24784387 A JP24784387 A JP 24784387A JP 24784387 A JP24784387 A JP 24784387A JP S6490716 A JPS6490716 A JP S6490716A
Authority
JP
Japan
Prior art keywords
groove
insertion piece
space
lens
stationary
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.)
Pending
Application number
JP24784387A
Other languages
Japanese (ja)
Inventor
Terunori Maruyama
Hisao Inage
Norio Yatsuda
Masao Takagi
Yoichiro Arai
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 JP24784387A priority Critical patent/JPS6490716A/en
Publication of JPS6490716A publication Critical patent/JPS6490716A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/34—Moulds having venting means

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To enable the title device to eliminate a weld line of a plastic lens and reduce a power cost by shortening the time required for lens molding cycle, by a method wherein a minute groove is formed on the whole circumference or a part of the surface of a cavity of a mold for molding the lens by corresponding to the external circumferential surface or the surface close to the external circumference of the outside of the effective diameter of the lens. CONSTITUTION:A groove whose width is 5mum or narrower and depth is 5mum or deeper is formed in a meshy state through etching on a groove surface 1'a of a stationary insertion piece 5, a groove surface 3' of a movable mold 6 and a groove surface 2'a of a movable insertion piece 7. A minute groove is provided in the meshy state similarly on groove surfaces 5b, 7b of the stationary insertion piece 5 and movable insertion piece 7. Resin 9 entered into a cavity 9' through a gate 8 is met at a position of a weld line alpha, gas collected in a V notch beta of the weld line alpha is diffused into a space gammaof the bottom of the grooves of the surfaces 1'a, 2'a, 3' by an increase of a resin pressure and an exhaust action of a rotary pump 21. The gas arrives at a space 12 and ventilation hole 25 by passing through a connection of the space gamma of the bottom of the groove and a gap 26 between the groove surface 5b of the stationary insertion piece 5 and a stationary mold 4. The gas is discharged similarly at a gap 27 and space 13.
JP24784387A 1987-10-02 1987-10-02 Molding device of plastic concave lens Pending JPS6490716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24784387A JPS6490716A (en) 1987-10-02 1987-10-02 Molding device of plastic concave lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24784387A JPS6490716A (en) 1987-10-02 1987-10-02 Molding device of plastic concave lens

Publications (1)

Publication Number Publication Date
JPS6490716A true JPS6490716A (en) 1989-04-07

Family

ID=17169494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24784387A Pending JPS6490716A (en) 1987-10-02 1987-10-02 Molding device of plastic concave lens

Country Status (1)

Country Link
JP (1) JPS6490716A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0680819A1 (en) * 1994-05-04 1995-11-08 Ciba-Geigy Ag Method and apparatus for molding opthalmic lenses using vacuum injection
JP2000218628A (en) * 1999-01-28 2000-08-08 Asahi Optical Co Ltd Mold for molding optical element
JP2001277252A (en) * 2000-03-30 2001-10-09 Suwa Netsukogyo Kk Method for producing cavity forming mold, cavity forming mold, and resin molding
US6616868B1 (en) 1998-04-22 2003-09-09 Teijin Chemicals, Ltd. Injection compression molding method for optically formed product
JP2004098538A (en) * 2002-09-11 2004-04-02 Konica Minolta Holdings Inc Method for manufacturing optical element made of plastic, mold for molding, and optical element
WO2012165593A1 (en) * 2011-06-02 2012-12-06 コニカミノルタアドバンストレイヤー株式会社 Mold for injection molding and injection molding method
TWI562881B (en) * 2015-09-11 2016-12-21 Everready Prec Ind Corp Optical lens and injection-molding mold thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0680819A1 (en) * 1994-05-04 1995-11-08 Ciba-Geigy Ag Method and apparatus for molding opthalmic lenses using vacuum injection
US6616868B1 (en) 1998-04-22 2003-09-09 Teijin Chemicals, Ltd. Injection compression molding method for optically formed product
JP2000218628A (en) * 1999-01-28 2000-08-08 Asahi Optical Co Ltd Mold for molding optical element
JP2001277252A (en) * 2000-03-30 2001-10-09 Suwa Netsukogyo Kk Method for producing cavity forming mold, cavity forming mold, and resin molding
JP2004098538A (en) * 2002-09-11 2004-04-02 Konica Minolta Holdings Inc Method for manufacturing optical element made of plastic, mold for molding, and optical element
WO2012165593A1 (en) * 2011-06-02 2012-12-06 コニカミノルタアドバンストレイヤー株式会社 Mold for injection molding and injection molding method
TWI562881B (en) * 2015-09-11 2016-12-21 Everready Prec Ind Corp Optical lens and injection-molding mold thereof

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