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Use of Dichroic Beam Splitters to Combine Beams From Independent Lasers in a Multiple Beam Aperture Imaging Printhead for Electrophotographic Printers

IP.com Disclosure Number: IPCOM000037438D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Levenson, MD: AUTHOR

Abstract

High pel, moderate speed electrophotographic printers will employ multiple independently packaged diode lasers to print at speeds above those possible with single lasers. The beams need to be combined using an optical system that employs beam-splitters and lenses as well as apertures to define the individual resolution spots. While two beams may be combined without loss of power using a polarization selective beam splitter, combining a greater number of laser beams requires some invention.

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Use of Dichroic Beam Splitters to Combine Beams From Independent Lasers in a Multiple Beam Aperture Imaging Printhead for Electrophotographic Printers

High pel, moderate speed electrophotographic printers will employ multiple independently packaged diode lasers to print at speeds above those possible with single lasers. The beams need to be combined using an optical system that employs beam-splitters and lenses as well as apertures to define the individual resolution spots. While two beams may be combined without loss of power using a polarization selective beam splitter, combining a greater number of laser beams requires some invention.

In the device disclosed here, the semiconductor diode lasers have two or more different wavelengths - for example 830 nm and 780 nm - and the beams are combined using dichroic beam splitters. Such a beam splitter will reflect one wavelength while transmitting the others. In the device shown in the figure two lasers with the same wavelength, but different polarizations, are combined using conventional methods, and then the two two-beam sub-assemblies are combined with a dichroic beam splitter. Another dichroic beam splitter could be used to add two more 860 nm beams, and then another to add two 720 nm, beams, etc. The result is a multibeam array that can print pels in parallel, but which deposits the maximum energy from each laser on the electrophotographic medium.

Disclosed anonymously.

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