xerography

xerography
Name	Xerography
Invented	1938
Inventor	Chester Carlson
Developer	Haloid Company; Xerox Corporation
Country	United States
Genre	Electrostatic dry copying

xerography

Xerography is a dry photocopying technique that uses electrostatic charges and photoconductive surfaces to reproduce images and text. It originated in the United States in the late 1930s and became a transformative office technology through mid-20th century commercialization. The method influenced communications, publishing, law, finance, and office management in nations and institutions worldwide.

History

Chester Carlson developed the first practical dry copying process in 1938 after experiments in Queens and associations with engineers at Bell Telephone Laboratories and the Battelle Memorial Institute. Carlson's collaboration with the Haloid Company led to the Haloid-Xerographic Division and the later rise of the Xerox Corporation, which displayed early machines at trade shows such as the New York World's Fair and supplied units to organizations including IBM and the United States Postal Service. Key commercial milestones involved patents contested in courts like the United States Court of Appeals for the Federal Circuit and licensing agreements with companies such as Canon Inc., Minolta, Ricoh, and Konica. The spread of xerographic labs in universities such as Harvard University, Stanford University, and Massachusetts Institute of Technology reshaped academic publishing and student printing. International adoption followed through partnerships with firms like Fuji Xerox and distribution via conglomerates like 3M and Kodak. Technological progress paralleled industrial research at places such as Bell Labs and corporate R&D centers including PARC (Palo Alto Research Center) and influenced office culture described in works by authors like Peter Drucker and commentators discussing the Information Age.

Principles and Process

Xerography relies on electrostatic charging of a photoconductive drum or belt composed of materials developed in laboratories such as GE Research and companies like DuPont and Eastman Kodak Company. Under bright illumination from lamps or LEDs developed by firms like Philips and Osram, a latent electrostatic image forms and is developed by charged toner particles produced by manufacturers such as Toshiba and Samsung Electronics. The toner image is transferred to paper sourced from mills such as International Paper and fixed by heat and pressure in fusing assemblies designed by engineering teams at Fuji and Canon. Advances in organic photoconductors involved chemists associated with Georgia Institute of Technology and University of Cambridge laboratories. Ancillary components—drive motors from Siemens, control electronics influenced by microprocessor work at Intel and Motorola, and firmware practices from companies like Microsoft—contributed to system reliability. The overall sequence—charging, exposure, development, transfer, fusing, and cleaning—reflects principles explored in standards bodies such as IEEE and regulatory frameworks influenced by agencies like the Environmental Protection Agency.

Technology and Equipment

Commercial xerographic devices evolved from tabletop units by Haloid to office copiers by Xerox, multifunction printers by Canon Inc., and high-speed production presses by Heidelberg and Mitsubishi Heavy Industries. Key components include photoreceptor drums and belts made with materials researched at MIT, charging corona wires replaced by charge rollers from firms like Ricoh, toner formulations advanced by chemical divisions at DuPont and BASF, and laser scanning assemblies pioneered following work at Bell Labs. Digital front ends and networked features integrate protocols and services from entities such as Novell, Cisco Systems, Adobe Systems, and Apple Inc. Maintenance and aftermarket support involve service networks like ServiceMaster and distributors such as Staples. Security functions reference standards developed by National Institute of Standards and Technology and legal requirements from bodies like European Commission for data protection and interoperability with enterprise systems from Oracle and SAP SE.

Applications and Uses

Xerography underpins office duplication in corporations such as General Electric, Ford Motor Company, and Procter & Gamble; governmental operations in agencies like the Internal Revenue Service and United States Department of State; and academic services at institutions including Yale University and University of Oxford. It enabled mail-order catalogs by Sears, Roebuck and Co. and printing for publishers such as Random House and Penguin Books for proofing and short runs. Legal firms and courts like the Supreme Court of the United States relied on copies for filings and exhibits; banking institutions like JPMorgan Chase and Bank of America used copy centers for records. Photocopy shops inspired small-business chains like FedEx Office and local franchises. Specialized applications appeared in libraries such as the Library of Congress, in archival projects with organizations like UNESCO, and in remote field offices of agencies like United Nations missions. The technology also influenced artistic movements and practitioners associated with Pop art and artists like Andy Warhol through mechanical reproduction techniques.

Environmental and Health Considerations

Environmental scrutiny involved regulators such as the Environmental Protection Agency and the European Environment Agency addressing emissions and waste from toners and fuser oil. Manufacturers implemented recycling programs in coordination with non-governmental organizations such as Greenpeace and industry groups like the Business and Institutional Furniture Manufacturers Association for cartridge take-back and reuse. Studies at institutions like Johns Hopkins University and Imperial College London evaluated particulate emissions and occupational exposure for workers in print shops and offices regulated under standards from Occupational Safety and Health Administration and World Health Organization. Chemical safety of silicone oils, polymer resins, and pigments prompted industry guidelines from associations such as Society of Automotive Engineers and testing by laboratories at Underwriters Laboratories. Lifecycle analyses by research teams at Stanford University and Carnegie Mellon University informed corporate sustainability efforts at firms including HP Inc. and Xerox Corporation.

Legal and Economic Impact

Xerography transformed information economies, affecting business models for companies like Time Inc., The New York Times Company, and Pearson PLC by facilitating desk-side reproduction and altering distribution channels. Litigation over patents and antitrust issues involved cases in courts such as the United States Supreme Court and international disputes in venues like the European Court of Justice, shaping intellectual property norms overseen by agencies like the United States Patent and Trademark Office and the European Patent Office. Licensing and standard-setting engaged corporations including Ricoh and Canon Inc. and consortia such as International Organization for Standardization committees. The copier industry supported manufacturing employment in regions with facilities from Samsung and Panasonic while enabling service economies exemplified by chains like The UPS Store; macroeconomic impacts appeared in studies by institutions like the World Bank and the International Monetary Fund. Copyright debates—implicating entities like Authors Guild and laws such as the Copyright Act of 1976—addressed fair use, libraries' reproduction rights, and the role of reprographic reproduction in educational access.

Category:Imaging technology