Optical pickup apparatus and method of manufacture thereof, optical disk apparatus and method of manufacture thereof, and injection molding die
US6075659A · kind A · utility
1Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1999 |
| Grant date | Jun 13, 2000 |
| Priority date | — |
| Expiry date | Apr 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0932
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection molding die comprising a lower die and an upper die for manufacturing an objective lens drive unit, comprises a plurality of gates formed on the lower die in position perpendiculars to the direction of opening and closing the lower die and the upper die for allowing resin to flow into the cavity formed of the lower die and the upper die and a plurality of runners each with an end thereof connected to the corresponding gate and the other end thereof formed on the upper die, wherein each of the runners including the end-to-end portion thereof is formed inclined toward the upper die.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.