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Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics by repeatedly passing a laser beam back and forth over a negatively-charged cylinder called a "drum" to define a differentially-charged image. The drum then selectively collects electrically-charged powdered ink (toner), and transfers the image to paper, which is then heated to permanently fuse the text, imagery, or both, to the paper. As with digital photocopiers, laser printers employ a xerographic printing process. Laser printing differs from traditional xerography as implemented in analog photocopiers in that in the latter, the image is formed by reflecting light off an existing document onto the exposed drum.
The LaserWriter is a laser printer with built-in PostScript interpreter sold by Apple, Inc. from 1985 to 1988. It was one of the first laser printers available to the mass market. In combination with WYSIWYG publishing software like PageMaker, that operated on top of the graphical user interface of Macintosh computers, the LaserWriter was a key component at the beginning of the desktop publishing revolution.
Toner is a powder mixture used in laser printers and photocopiers to form the printed text and images on the paper, in general through a toner cartridge. Mostly granulated plastic, early mixtures only added carbon powder and iron oxide, however, mixtures have since been developed containing polypropylene, fumed silica, and various minerals for triboelectrification. Toner using plant-derived plastic also exists as an alternative to petroleum plastic. Toner particles are melted by the heat of the fuser, and are thus bonded to the paper.
The HP 2100 is a series of 16-bit minicomputers that were produced by Hewlett-Packard (HP) from the mid-1960s to early 1990s. Tens of thousands of machines in the series were sold over its twenty-five year lifetime, making HP the fourth largest minicomputer vendor during the 1970s.
Deskjet is a brand name for inkjet printers manufactured by Hewlett-Packard. These printers range from small domestic to large industrial models, although the largest models in the range have generally been dubbed DesignJet. The Macintosh-compatible equivalent was branded as the Deskwriter and competed with Apple's StyleWriter, and the all-in-one equivalent is called OfficeJet.
LaserJet as a brand name identifies the line of laser printers marketed by the American computer company Hewlett-Packard (HP). The HP LaserJet was the world's first desktop laser printer. Canon supplies both mechanisms and cartridges for all HP's laser printers.
The StyleWriter brand is a line of inkjet serial printers by Apple, targeted mainly towards consumers. They produced print quality that was better than the dot matrix ImageWriters, and were cheaper than the LaserWriters. All but a few models contained Canon print engines, while the last few were re-badged HP DeskJet printers. When Steve Jobs returned to Apple in 1997, he discontinued most of the company's accessory product lines, including the StyleWriter and LaserWriter.
HP Jetdirect is the name of a technology sold by Hewlett-Packard that allows computer printers to be directly attached to a Local Area Network. The "Jetdirect" designation covers a range of models from the external 1 and 3 port parallel print servers known as the 300x and 500x, to the internal EIO print servers for use with HP printers. The Jetdirect series also includes wireless print server models, as well as gigabit Ethernet and IPv6-compliant internal cards.
PC LOAD LETTER is a printer error message that has entered popular culture as a technology meme referring to a confusing or inappropriate error message. The error message's vagueness was mocked in the 1999 comedy film Office Space.
Printer Command Language, more commonly referred to as PCL, is a page description language (PDL) developed by Hewlett-Packard as a printer protocol and has become a de facto industry standard. Originally developed for early inkjet printers in 1984, PCL has been released in varying levels for thermal, matrix, and page printers. HP-GL/2 and PJL are supported by later versions of PCL.
The HP 9800 is a family of what were initially called programmable calculators and later desktop computers that were made by Hewlett-Packard, replacing their first HP 9100 calculator. It is also named "98 line". The 9830 and its successors were true computers in the modern sense of the term, complete with a powerful BASIC language interpreter.
The HP LaserJet 2400 series was a line of grayscale laser printers sold by Hewlett-Packard. The printer was aimed at small and medium business use. It was the successor to the HP LaserJet 2300 series, and was in turn replaced by the HP LaserJet P3000 series.
The HP LaserJet 4 is a group of monochrome laser printers produced in the early to mid-1990s as part of the LaserJet series by Hewlett-Packard (HP). The 4 series has various models, including the standard LaserJet 4 for business use, the 4L for personal use and the 4P for small businesses. Additional models included the 4Si model, created as a heavy-duty business printer, and the 4V model, a B-size printer for desktop publishing and graphic artists. There are also PostScript variants of these machines with the '4M' designation, where M stands for, but is not limited to, usage with an Apple Macintosh. Hewlett-Packard also released an upgraded version of the LaserJet 4/4M known as the 4 Plus ('4+')/4M Plus ('4M+').
Qume was a manufacturer of daisy-wheel printers originally located in Hayward, California, later moving to San Jose. Around 1980, it also opened a manufacturing facility in Puerto Rico. It once dominated the daisy-wheel market. As the market for its printers declined in the 1980s, the company developed a line of computer terminals. It was founded by David S. Lee and Robert E. Schroeder in 1973, grew to become the largest printer company in the world, and was acquired by ITT Corporation for an unprecedented $164M in 1978. It remained a division of ITT until its acquisition by Wyse Technology sometime before 1995. Qume also manufactured floppy diskette drives, particularly 5.25" ones, but it also manufactured 8" diskette drives as well. Qume's diskette drives were included in some IBM PC models, such as the Portable Personal Computer and PCjr.
The HP LaserJet P3000 series is a series of black and white laser printers printers for small to medium business use. Unveiled in October 2006, they are a direct replacement for the HP LaserJet 2400 series.
The LaserJet 4000 series is Hewlett-Packard's medium-duty monochrome laser printer range and the successor to the LaserJet 5 series.
The HP LaserJet 1020 is a low cost, low volume, monochromatic laser printer. It was a replacement for the HP LaserJet 1012. The production started in June 2005.
In computing HP Roman is a family of character sets consisting of HP Roman Extension, HP Roman-8, HP Roman-9 and several variants. Originally introduced by Hewlett-Packard around 1978, revisions and adaptations were published several times up to 1999. The 1985 revisions were later standardized as IBM codepages 1050 and 1051. Supporting many European languages, the character sets were used by various HP workstations, terminals, calculators as well as many printers, also from third-parties.
The Laserjet 2300 series was a line of grayscale laser printers sold by Hewlett-Packard. The printer was aimed at small and medium business use. The printer utilizes the DRAM memory technology and a packs 32 MB standard memory, which is expandable to 288 MB. It is compatible with Microsoft Windows and Macintosh Operating System.
References
- 1 2 Twenty Years of Innovation: HP LaserJet and Inkjet Printers 1984–2004 (PDF, archived) (Accessed June 15, 2006)
- ↑ Printer Works - 5P (Accessed June 15, 2006)
- ↑ The 5L Extra, release in July 1996, was a standard 5L combined with a software bundle
- ↑ Printer Works - LaserJet 5 (Accessed June 15, 2006)
- ↑ Printer Works - 5Si Mopier (Accessed June 15, 2006)