Reflector produced by consecutive injections of two thermoplastic materials
US4668542A · kind A · utility
2Cited by
1References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 15, 1985 |
| Grant date | May 26, 1987 |
| Priority date | — |
| Expiry date | Feb 15, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31728
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An automobile headlamp reflector is produced by successive injections of a plastics material comprising a first, internal layer of polyamide forming a skin, a second layer of a charged polyamide with 50.+-.5% mineral and/or organic filler forming a supporting structure, and a third, external layer of polyamide, said first and third layer forming skin surrounding said supporting structure. The ratio EPI/ES in the optical zone of the reflector is such that the surface does not display a local variation greater than 0.002/mm; EPI and ES being respectively the thicknesses of the first, internal layer and the supporting structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.