US Patent No: 5,948,327

Number of patents in Portfolio can not be more than 2000

Lens injection-compression-molding method

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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 CORPORATIONTOKYO1984

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Asami, Hiroshi Shizuoka, JP 46 143
Saito, Kiyohiro Tokyo, JP 32 337

Cited Art Landscape

Patent Info (Count) # Cites Year
 
GENERAL ELECTRIC COMPANY (1)
4,184,835 Mold apparatus 46 1978
 
GENTEX OPTICS, INC. (1)
4,364,878 Method for molding ophthalmic lenses 71 1980
 
GLIC/MAUS VENTURES (1)
4,828,769 Method for injection molding articles 83 1986
 
OPTICS TECHNOLOGY, INC. (1)
4,900,242 Apparatus for injection molding articles 71 1988

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
DOUGHERTY, THOMAS J. (1)
6,287,488 Method for injection molding of high quality parts 4 1999
 
GAMBRO RENAL PRODUCTS, INC. (1)
6,949,214 Method and apparatus for injection molding a fluid filter 3 2002
 
HOYA CORPORATION (1)
7,332,110 Method and device for producing optical part 4 2004
 
HUSKY INJECTION MOLDING SYSTEMS LTD. (1)
7,293,981 Apparatus for injection molding using active material elements 5 2004
 
MAGNIVISION, INC. (1)
6,270,698 Stress-relieved acrylic optical lenses and methods for manufacture by injection coining molding 8 1999
 
NYPRO INC. (1)
7,807,226 System, device, and method for producing thin plastic lenses 0 2005