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Functional Description
Color Ink Jet Print Head Functioning
Ink Jet Print Head Description
The color ink-jet print head is made up of an interchangeable sealed shell
containing 51 print nozzles, three liquid ink cartridges (one for each major
color) and an electrical circuitry with 51 resistive heating elements (see figure
2-5a).
The nozzles are divided among the three major colors as follows:
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Yellow: 18 nozzles
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Magenta: 17 nozzles
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Light blue: 16 nozzles
The nozzles are constructed in the same way as the ones on the monochrome
ink-jet print head. They are assembled on a nickel and gold compound referred
to as being electroformatted, and have a conical shape as shown in figure 2-5b.
The ink is contained in three cartridges, one for each color.
A sponge inside each cartridge prevents the ink from being shaken during print
head movements. This avoids problems during carriage translations, avoids the
ink from leaking out of the bleedholes and the forming of froth.
The ink flows to the nozzles through small channels in the print head's resin
layer. This layer is electrically insulated from the resistive heating elements.
Each resistive heating element corresponds to a nozzle and is connected to the
head's external electric contacts.
S-2.PM5
11/7/94, 13:40
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Summary of Contents for DECcolorwriter 120ic
Page 58: ...3 21 Installation Fig 3 21 Fonts selector switches settings S 3 PM5 11 7 94 17 16 21 ...
Page 59: ...3 22 Installation Fig 3 22 Character sets selector switches settings S 3 PM5 11 7 94 17 16 22 ...
Page 60: ...3 23 Installation Fig 3 23 Character sets selector switches settings S 3 PM5 11 7 94 17 16 23 ...
Page 78: ...7 3 Electrical Interconnections Fig 7 1 Main board S 7 PM5 3 14 97 3 38 PM 3 ...
