[특허]Workpiece of plastic and production process for such a workpiece

[미국특허] Workpiece of plastic and production process for such a workpiece 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B29C-065/16
출원번호	US-0702434 (1996-09-24)
우선권정보	DE-4411251 (1994-03-31)
국제출원번호	PCT/DE95/00394 (1995-03-23)
§371/§102 date	19960924 (19960924)
국제공개번호	WO-9526869 (1995-10-12)
발명자 / 주소	Muellich Vitus,DEX
출원인 / 주소	Marquardt GmbH, DEX
대리인 / 주소	VenableKelemen
인용정보	피인용 횟수 : 104 인용 특허 : 4

초록 ▼

The invention relates to a workpiece, in particular a housing (6) for an electrical switch, and to a process for its production. The workpiece is composed of at least two workpiece parts (7, 8) of plastic, preferably a thermo-plastic, welded together by laser beams (11) along a joining zone (10), the two workpiece parts (7, 8) having a transmission coefficient and an absorption coefficient for the spectrum of the laser beams (11) which are different from one another, at least in subregions. The one, first workpiece part (8) is made to be at least partially transmitting for the laser beams (11) in the region from a first coupling-in zone (12), in which the laser beams (11) impinge on the first workpiece part (8), up to the joining zone (10), whereby part of the laser beams (11) can penetrate through the first workpiece part (8) and can penetrate into the second workpiece part (7) at a second coupling-in zone (13). The second workpiece part (7) is made to be at least partially absorbent for the laser beams (11) in the region of the joining zone (10) at the second coupling-in zone (13).

대표청구항 ▼

[ I claim:] [22.] A process for welding together a first and a second plastic part by a laser beam to form an article of manufacture, wherein at least a portion of said first plastic part is transparent to the laser beam and at least a portion of said second plastic part absorbs the laser beam; said process comprising the following steps:(a) including an additive, affecting a transparency to the laser beam, in the material of said first plastic part in a first proportion such that a region of said first plastic part is at least partially transparent to the laser beam;(b) including an additive, affecting a transparency to the laser beam, in the material of said second plastic part in a second proportion such that a region of said second plastic part is at least partially absorbent to the laser beam; said first proportion being different from said second proportion;(c) setting reflectivities for said first and second plastic parts such that said reflectivities are substantially identical to visible light rays throughout the first and second plastic parts, and said first and second plastic parts are substantially opaque to visible light;(d) positioning said first and said second plastic parts in a path of a laser beam such that a surface portion of said first plastic part faces a surface portion of said second plastic part to form a joining zone and that said first plastic part is upstream of said second plastic part as viewed in a direction of propagation of the laser beam;(e) directing the laser beam to impinge on a first coupling-in zone of said first plastic part, to pass through said region of said first plastic part from said first coupling-in zone to said joining zone, to impinge on a second coupling-in zone of said second plastic part at said joining zone and to pass into said region of said second plastic part from said second coupling-in zone, whereby said second plastic part is heated at said second coupling-in zone, causing said first and said second plastic parts to assume a molten state in said joining zone; and(f) cooling said joining zone to effect a solidifying thereof.

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[미국특허] Workpiece of plastic and production process for such a workpiece 원문보기

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