OPTICAL ELEMENT MADE OF PLASTIC AND OPTICAL PICKUP DEVICE

Title:

OPTICAL ELEMENT MADE OF PLASTIC AND OPTICAL PICKUP DEVICE

Document Type and Number:

Japanese Patent JP2004144954

Kind Code:

A

Abstract:

To reproduce and record a plurality of kinds of optical information recording media with an excellent pickup characteristics.

The melt index is set in the range of 30-60 g/10min in resin containing a composition unit derived from α-olefin and cyclic olefin. This arrangement spreads the resin to tips of parts corresponding to optical path difference imparting structure of a metallic mold in molding. The optical path difference imparting structure is thus formed with a high accuracy, to converge light with high reliability.

More Like This:

JPH04241234	OPTICAL PICKUP DEVICE
JP2006235007	LAMINATED OPTICAL ELEMENT, LAMINATED DIFFRACTIVE OPTICAL ELEMENT, MOLDING METHOD THEREOF AND OPTICAL MATERIAL
JP2004302090	METHOD FOR MANUFACTURING MOTHER DIE, MOTHER DIE, METHOD FOR MANUFACTURING MOLD, MOLD, OPTICAL ELEMENT AND ELECTRON BEAM DRAWING APPARATUS

Inventors:

EGURO YAYOI
HATTORI HIROYUKI
SHIN YUICHI
YAMASHITA KIYOSHI

Application Number:

JP2002309040A

Publication Date:

May 20, 2004

Filing Date:

October 23, 2002

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KONICA MINOLTA HOLDINGS INC

International Classes:

G02B5/18; C08J5/00; C08K5/00; C08L23/26; C08L45/00; G02B1/04; G02B3/00; G11B7/135; (IPC1-7): G02B5/18; C08J5/00; C08L23/26; C08L45/00; G02B1/04; G02B3/00; G11B7/135

Attorney, Agent or Firm:

Hiroshi Arafune

Previous Patent: DEVELOPING DEVICE

Next Patent: REFLECTION TYPE OR TRANSLUCENT TYPE LIQUID CRYSTAL DISPLAY, AND ITS MANUFACTURING METHOD