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Multiplex Drivers for a Drop On Demand Print Head Disclosure Number: IPCOM000045589D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 47K

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This article describes multiplexed electrical circuits for driving drop-on-demand (DOD) print heads.

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Multiplex Drivers for a Drop On Demand Print Head

This article describes multiplexed electrical circuits for driving drop-on- demand (DOD) print heads.

Fig. 1 shows a multinozzle DOD print head comprising L-nozzles arranged in an NxM matrix. In the figure, L represents 40 nozzles, M represents four columns, and N represents ten rows. In this configuration, the shift register 10, which is used to demultiplex serial data shipped on conductor 12, is shared. the shift register 10 is a 10-bit shift register. A 2-bit decoder (one of four) 14 coacts with the shift register to drive an array of four columns of ten DOD crystals. Each crystal has an associated driver D(1) ((1)) through D(4)((10)). The first subscript represents the column number, while the second subscript represents the row number.

Figs. 2 and 3 demonstrate another type of multiplex drive circuit. The DOD crystal elements are isolated. This enables the drivers to be ultiplexed. This requires, for example, a series diode and a parallel resistor for each crystal element to achieve isolation (Fig. 2). Such a three-element device is driven by a cathode driver and an anode driver, respectively. With reference to Fig. 3, an array consisting of 40 nozzles is driven by only 10 cathode drivers and four anode drivers.

Timing for this scheme is shown in Fig. 4. The maximum number of columns which can be multiplexed is set by the sum of the time required to shift serial data into the shift register, plus the maximum...