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Method for surface treatment of transparent part and part treated in this way

A processing method, a technology for parts, applied in the direction of methods of preventing contamination, cleaning methods and utensils, lighting and heating equipment, etc.

Inactive Publication Date: 2017-02-22
PEZHO SITROEN AUTOMOBILS SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0025] The limitations that exist in headlamps and signal lamps of motor vehicles (in particular the fulfillment of the photometric quality of the light beams at the output of headlamps or signal lamps) are not mentioned in this document

Method used

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  • Method for surface treatment of transparent part and part treated in this way
  • Method for surface treatment of transparent part and part treated in this way
  • Method for surface treatment of transparent part and part treated in this way

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Embodiment Construction

[0046] On the figures, the same numerical references designate the same elements.

[0047] The scale of the drawings has not been followed.

[0048]The method according to the invention advantageously involves deforming a metal mold texture (in particular made of steel) in order to produce a negative mold impression on a polymer (in particular polycarbonate) part obtained by injection moulding.

[0049] The engraving or texturing of the mold is advantageously carried out using a laser of the femtosecond type, while other means of mechanical texturing can be used, such as sandblasting, machining (milling), ...

[0050] Femtosecond lasers are capable of producing extremely short (approximately one hundred femtoseconds, i.e. approximately 1×10 -13 seconds) pulse. However, the duration of this pulse enables extremely high power.

[0051] The advantages of femtosecond laser are many:

[0052] - can deform the texture of industrial molds made of metal;

[0053] - Ability to pro...

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Abstract

A method for surface treatment of a transparent polymer part is disclosed, consisting of, in a first step, etching a determined topography of patterns in relief onto the external surface of a metal mould using a femtosecond laser and, in a second step, applying the mould under pressure onto the surface of the part to be treated, in such a way as to reproduce the patterns of the mould, in negative, on the part; said topography of patterns being adapted to the type of polymer, both to optimize the wettability of the surface preventing the formation of condensation on said surface and also so as not to affect the optical properties of the part.

Description

technical field [0001] The present invention relates to the surface treatment of light-transparent parts obtained by injection molding processes, in particular the invention relates to the treatment of the inner surfaces of glass or mirrors of headlights or signal lights of motor vehicles, which are prone to moisture (caused by Condensation water composed of tiny water droplets). Background technique [0002] Moisture gives the initially transparent and bright surface a whitish appearance and thus degrades the visual quality of the surface while degrading the optical properties of the surface, especially the transparency of the surface. [0003] On the other hand, in the case of especially the glass surfaces of headlamps and signal lamps of motor vehicles, moisture can degrade the photometric properties of light beams passing through the moisture-covered surfaces. [0004] For headlamps or signal lamps using LEDs fitted to more and more vehicles, the condensation phenomenon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D11/00F21S8/10
CPCB29D11/00336B08B17/065F21S41/28F21S45/00G02B27/0006
Inventor M·戈尔克S·瓦莱特
Owner PEZHO SITROEN AUTOMOBILS SA
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