Title:
OBJECTIVE LENS AND OPTICAL PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/093165
Kind Code:
A1
Abstract:
Disclosed are an objective lens capable of suppressing defects at formation time in a lens with high NA and an optical pickup device. The lens uses a resin (PL) with an MFR of greater than or equal to 10 (g/10 min) and less than or equal to 70 (g/10 min), and therefore, from the initial state shown in FIG. 2(a) to the final state shown in FIG. 2(b), curing of the resin (PL) in the vicinity of a gate portion (GT) is suppressed, pressure of a runner (LN) side is conveyed to the resin (PL) within a cavity, and as a result, the resin (PL) is molded to a vicinity of a maximum thickening of a transfer plane (10a) of a first mold (10) having a small radius of curvature. Therefore, it is possible to acquire a high-precision optical surface.
Inventors:
YAMAMOTO SHOGO (JP)
Application Number:
PCT/JP2011/050705
Publication Date:
August 04, 2011
Filing Date:
January 18, 2011
Export Citation:
Assignee:
KONICA MINOLTA OPTO INC (JP)
YAMAMOTO SHOGO (JP)
YAMAMOTO SHOGO (JP)
International Classes:
G11B7/135; C08F210/02; G02B13/00
Domestic Patent References:
| WO2006112434A1 | 2006-10-26 |
Foreign References:
| JP2007179720A | 2007-07-12 | |||
| JP2009211795A | 2009-09-17 | |||
| JP2007154072A | 2007-06-21 | |||
| JP2001235677A | 2001-08-31 | |||
| JP2004197067A | 2004-07-15 |
Download PDF:
Claims: