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Evolution of the Computer Printer
Transcript of Evolution of the Computer Printer
In computing, a printer is a peripheral which produces a text and/or graphics of documents stored in electronic form, usually on physical print media such as paper or transparencies. What is a Printer? The earliest dated printed book is known as the "Diamond Sutra" printed in China in 868 CE.
In 1440, Johannes Gutenberg invented the first movable type printing press which revolutionized the printing process and made it alot cheaper.
Ottmar Mergenthaler's invention of Linotype composing machine in 1886 is considered as the greatest development in printing after the invention of movable type about 400 hundred years earlier.
In 1947, Phototypesetting was made practical. Noteworthy Historical Facts http://inventors.about.com/library/inventors/blcomputer_printers.htm
http://en.wikipedia.org/wiki/Difference_engine. The Difference Engine Printers Rendered Obsolete Printers Currently Used Printers of the Future Thank You
Jivy Chhatwal The Difference Engine was fianlly built by The London Science Museum in London lead by Doron Swade and completed in 1991.
The Printer was completed in 2000.
Highly accurate and advanced with page formatting and even text wrap.
Design had some delibrate errors to prevent industrial espionage.
"Babbage's reputation has been vindicated, both as a visionary of the computer age and, more specifically, as an engineer of the most extraordinary calibre," Doron Swade. Laser Printer Inkjet Printer Dot Matrix Daisy wheel Line Printer Thermal Printers "Babbage Printer Finally Runs" In 1938, Chester Carlson invented electro photography or xerox which laid the foundation for laser printers
Make use of Toner or Dry ink thorough Xerography
The original laser printer called EARS was developed at the Xerox Polo Alto Research centre (PARC) form 1969-1971. Invented by researcher, Gary Starkweather
IBM 3800 was the industry's first high-speed laser printer with almost 100 impressions per second.
HP releases the Laser Jet 4, the first 600 by 600 dots per inch resolution laser printer
Speed~ 12000 monochrome pph or 6000 color pph (pages per hour)
DPI Resolution- 1200 DPI commonly available by 2008
The idea of computer printing came first to Charles Babbage.
He designed the first printer (1822-1849) to go along with his first computer to check for errors in the machine's operations.
He could not physically construct his design due to lack of funding and recognition from Government. Type of impact printer introduced in 1970
LA30 first 30 character per second printer by Digital Equipment Coorporation
Prints as the head containing pin matrix moves and hits an ink ribbon against paper
Can print graphical images among various forms of text
Use either a 9-pin or 24-pin head
DPI Resolution- 360X360 dpi
Operates as Impact printer when a hammer strikes the 'Daisy Wheel' which contains a letter form at every tip of the petal
This letter form in turn strikes the ink ribbon
David S. Lee, inventor of impact printer technology introduced the first commercialy successful Daisy Wheel Printer in 1972 with 30 cps
Diablo 630 was also one of the immensely successful printer
Limited to letter forms on the wheel Print lines of text a time
Can be further differentiated into 4 designs-
Drum Printer- Letter forms embossed on a drum
Chain Printer- Letter forms embossed on many moving chains
Bar printer- Letter forms embossed on a single chain
Comb printer- A mix of Line and Dot matrix printers
600~1200 lines per minute Creates digital images by propelling droplets of ink onto paper
Can be divided into 2 major categories-
1. Continuous Inkjet- a stream of droplets by a powerful pump and microscopic nozzle, idea patented by Lord Kelvin in 1867
2. Drop on Demand- Either thermal changes or other methods trigger the propelling of a droplet
Considerably less noisy than many impact printers
High resolutions of 1200-4800 dpi
Most common printers due to feasible consumer models
Operate by heating certain regions of thermochromic paper using a thermal print head
An advanced form of Dot-matrix printers as they use thermal print heads consisting of pins
Both monochromatic and colour results can be achieved through various paper types and difference in temperatures
Quitier and faster than thier impact predecessors
can be seen in- 3D Printers UV Printers These printers create tangible and real life models of computer drawings
The make layers of composite plastic powder
The model can also be functional
So when are you printing your dream house? The ZINK technology or the inkless printers
Operates by passing UV radiation through a paper layered with UV sensitive chemiclas
Can be written, erased and rewritten
Currently under development by Xerox