Non-impact printer module with improved burn-in testing capabili

Details Non-impact printer module with improved burn-in testing capabili Non-impact printer module with improved burn-in testing capabili

1991-01-02

1995-02-14

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347237, B41J 2435

Patent

active

053899539

ABSTRACT:
A testable assembly that includes a plurality of recording elements such as LED's for burn-in testing or the like is described. The assembly includes LED chip arrays, integrated circuit driver chips and spreader boards for distributing signals to the driver chips. The spreader boards each include a minimum number of test pads for providing power and control signals during burn-in testing. The driver chip is designed for grey level recording using a plurality of data bits to control the pixel recording period for each LED. Burn-in testing is accomplished without even provision for real data signals. Rather, pseudo data signals are generated internally by a weak current pull-up circuit associated with each data input lead of the driver chip. This pull-up circuit is easily overridden by normal data signals during normal printhead operation. In addition to power signals, an exposure clock and latch signal are provided at the input pad for varying power and duty signal to the LED's during testing.

REFERENCES:
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patent: 4918462 (1990-04-01), Tomita et al.
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Rudolf F. Graf, Radio Shack Dictionary of Electronics, Howard W. Sams & Co., Inc., Indianapolis, Ind., 1974, p. 291.
A Monolithically Integrated 128 LED Driver and its Application, IEEE Transactions on Consumer Electronics, vol. CE-32, No. 1, Feb. 1986, pp. 26-31, by Burkhart et al.

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