Lens injection-compression-molding method

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5948327
SERIAL NO

08832656

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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In an injection step, actual injection speed V is closed-controlled so that the actual injection speed V becomes equal to first or second preset speed V.sub.1 or V.sub.2 while comparing the actual injection speed V with the first or second preset speed V.sub.1 or V.sub.2 in the section between S.sub.0 and S.sub.1 from the time when injection of molten resin is started up to the time when the molten resin reaches this side of a gate portion 46 or the section between S.sub.1 and S.sub.2 from the time when the molten resin reaches this side of the gate portion 46 up to the time when the molten resin reaches the inside of a cavity 3. The injection speed V is open- controlled to third preset speed V.sub.3 in the section between S.sub.2 and S.sub.3 from the time when the molten resin reaches the inside of the cavity 3 up to the time when injection of the molten resin is completed. Because a high injection speed can be secured and an injection speed change can be decreased, it is possible to decrease the frequency of a feed history appearing on the surface of a molded product.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HOYA CORPORATIONTOKYO1754

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Asami, Hiroshi Tokyo, JP 35 250
Saito, Kiyohiro Tokyo, JP 30 379

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Gentex Optics, Inc. (1)
* 4364878 Method for molding ophthalmic lenses 72 1980
 
OPTICS TECHNOLOGY, INC. (1)
* 4900242 Apparatus for injection molding articles 76 1988
 
GLIC/MAUS VENTURES (1)
* 4828769 Method for injection molding articles 87 1986
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MAGNIVISION, INC. (1)
* 6270698 Stress-relieved acrylic optical lenses and methods for manufacture by injection coining molding 8 1999
 
HOYA CORPORATION (2)
7332110 Method and device for producing optical part 4 2004
* 2005/0212,154 Method and device for producing optical part 0 2004
 
HUSKY INJECTION MOLDING SYSTEMS LTD. (2)
7293981 Apparatus for injection molding using active material elements 6 2004
* 2005/0236,740 Method and apparatus for injection compression molding using active material elements 1 2004
 
DOUGHERTY, THOMAS J. (1)
* 6287488 Method for injection molding of high quality parts 4 1999
 
NYPRO INC. (2)
7807226 System, device, and method for producing thin plastic lenses 0 2005
* 2006/0163,760 System, device, and method for producing thin plastic lenses 2 2005
 
GAMBRO RENAL PRODUCTS, INC. (2)
* 6949214 Method and apparatus for injection molding a fluid filter 4 2002
* 2003/0006,187 Fluid filter and methods for making same 3 2002
 
NOKIA CORPORATION (1)
* 2007/0010,303 High quality optical windows for mobile phones and cameras 3 2005
* Cited By Examiner