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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First Claim

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Patent Owner(s)

  • HOYA CORPORATION

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Asami, Hiroshi Tokyo, JP 35 219
Saito, Kiyohiro Tokyo, JP 30 372

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (3)
* 4,364,878 Method for molding ophthalmic lenses 72 1980
* 4,828,769 Method for injection molding articles 86 1986
* 4,900,242 Apparatus for injection molding articles 76 1988
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (11)
* 6,287,488 Method for injection molding of high quality parts 4 1999
* 6,270,698 Stress-relieved acrylic optical lenses and methods for manufacture by injection coining molding 8 1999
* 6,949,214 Method and apparatus for injection molding a fluid filter 4 2002
* 2003/0006,187 Fluid filter and methods for making same 3 2002
7,293,981 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
7,332,110 Method and device for producing optical part 4 2004
* 2005/0212,154 Method and device for producing optical part 0 2004
* 2007/0010,303 High quality optical windows for mobile phones and cameras 3 2005
7,807,226 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
* Cited By Examiner