monochrome cartridge yield 20.11.2002paul jeran – sc28 1 paul l jeran hewlett-packard company...

Monochrome Cartridge Yield

20.11.2002 Paul Jeran – SC281

Paul L Jeran

Hewlett-Packard Company

Editor ISO/IEC JTC1 SC28 19752Method for the determination of toner cartridge yield for monochromatic electrophotographic printers and multi-function devices that may contain printer components


20.11.2002 Paul Jeran – SC282

– Allows comparisons of productsProduct yield in the same market segment can be compared without concern that the numbers do not compare

– Setting of design goalsDuring product design, goals can be specified and performance tested

– Calculation of total cost of ownershipFor all-in-one monochrome printers, cost of toner is a major contributor to the overall cost of ownership

– Marketing specificationsUse of common specifications gives the customer a number they can trust when making a purchase decision

Why is a standard needed?


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European Printer Manufacturers and Importers (EPMI)

ISO/IEC 10561 (Dr. Grauert) - Method for measuring throughput – Class 1 and Class 2 printers

Defined a standard test pageAll Courier font, low page coverage, but defined

Fade is not quantified. “You know it when you see it”

Environmental conditions loosely defined30%-70% RH – Can have a significant effect on yield

History


20.11.2002 Paul Jeran – SC284

Standard Test Method Committee (STMC)

ASTM F1856 – Standard Practice for Determining Toner Usage for Printer Cartridges

Output coverage definedInput file edited to print at 5% coverage. Does not represent

customer usageEnd of Life estimated

Cartridge life estimated by weight of toner availableEnvironmental conditions not defined

Cartridge can be tested at any point within the operating range of the printer

Sample sizeSample size not specified

History


20.11.2002 Paul Jeran – SC285

Standard development goals:

– Unbiased testing– Customer based test file– Simple to evaluate– Statically significant results– Allow different cartridges & printers to be

compared

ISO/IEC JTC1 SC28 Approach


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Print EnvironmentMust be controlled to minimize effect on yield


Normalized Cartridge Yield

0

0.2

0.4

0.6

0.8

1

1.2

10C - 20% 10C - 80% 23C - 20% 32C - 20% 32C - 80%


20.11.2002 Paul Jeran – SC287

Print EnvironmentFrom the ISO/IEC FCD 19752:

Temperature: Testing room average 23.0C +/-2C

Readings to be made with a running average of 1 hour with readings recorded at least every 15 minutes, all running average temperatures are to be between 20.0C and 26.0C.

Relative Humidity: Testing room average 50% +/-10% RH

Readings to be made with a running average of 1 hour with readings recorded at least every 15 minutes, all running average RHs are to be between 35% and 65%.



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Test page & printing

– Format for intra OS compatibility – Sized for A4 or Letter printing– Features placed for end of life determination– Represents a standard “consumer” type document



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End of Life

– Use actual measurement of cartridge yield, run cartridge to fade condition

– Allow for the possibility of cartridge shaking

– Fade determination quick and simple

– Fade defined as a 3mm break in the upper and lower lines of text around the page



20.11.2002 Paul Jeran – SC2811

End of Life


3mm gap

(See poster for better illustration)


20.11.2002 Paul Jeran – SC2812

Sample size & Statistics From the ISO/IEC FCD 19752:

Minimum sample size

3 Engines and 3 cartridges/engine (9 Cartridges total) Compromise between reduction in variation an economics of testing.

Additional engines and cartridges can be tested as long as an equal number of cartridges is tested on each engine. Allows large manufacturers better estimate variation.

Use 90% lower confidence bound as the reported value



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Sample size & Statistics


Sampleing Effect on Reported Yield

9289 938495689552

8000

8500

9000

9500

10000

10500

1

6 C

art

ridg

es,

4 P

rinte

rs

8

Ca

rtrid

ge

s,4

Prin

ters

8

Ca

rtrid

ge

s,2

Prin

ters

9

Ca

rtrid

ge

s,3

Prin

ters

90

% L

ow

er

Co

nfi

de

nc

e B

ou

nd


20.11.2002 Paul Jeran – SC2814

Future Work

Standard for color yield test suite

Standard for measuring Color electrophotographic consumable yield

Standard for measuring color ink jet consumable yield


20.11.2002 Paul Jeran – SC2815

Membership

ISO/IEC JTC1 SC28 Members

Austria Brazil China Germany Italy

Japan Korea Netherlands Poland Philippines

Romania Slovenia Thailand Uruguay USA

monochrome cartridge yield 20.11.2002paul jeran – sc28 1 paul l jeran hewlett-packard company...

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