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	Illumination apparatus with polarizing elements for beam shaping
	AMUNDSEN, THOMAS; GOOD, TIMOTHY, A.; GIORDANO, PATRICK, A.
	2001-07-05
著作权人	METROLOGIC INSTRUMENTS, INC.
专利号	WO2001048520A1
国家	世界知识产权组织
文献子类	发明申请
其他题名	Illumination apparatus with polarizing elements for beam shaping
英文摘要	Illumination apparatus includes a light source (10) which directs a polarized source beam (16) in a downstream direction along an optical axis and desirably focuses the beam. A polarization-altering element (20) downstream from the source alters the polarization in a portion or portions of the source beam, so that the altered beam (24) includes portions (23, 25) having different polarization directions. The altered beam passes downstream through a polarization-selective filter (28). The output beam (30) from the polarization-selective filter can include either portion depending on the orientation of the filter. The arrangement can be used to provide a spot of a given size and shape at the focal location (18) in a scanner such as a bar code scanner. The size and depth of field of the spot can be varied dynamically during operation.
公开日期	2001-07-05
申请日期	2000-12-28
状态	未确认
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/52333]
专题	半导体激光器专利数据库
作者单位	METROLOGIC INSTRUMENTS, INC.
推荐引用方式 GB/T 7714	AMUNDSEN, THOMAS,GOOD, TIMOTHY, A.,GIORDANO, PATRICK, A.. Illumination apparatus with polarizing elements for beam shaping. WO2001048520A1. 2001-07-05.

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