Replaceable printing component with factory identity code

Patent metadata

Field	Value
Publication number	US-9511596-B2
Application number	US-201514967683-A
Country	US
Kind code	B2
Filing date	Dec 14, 2015
Priority date	Aug 30, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

In one example implementation, a replaceable printing component includes a fluid supply chamber, and a printhead on the fluid supply chamber. The printhead includes a memory storing a factory identification code that comprises a combination of digitized analog performance parameters. The printhead also includes electronic test components from which the analog performance parameters have been measured.

First claim

What is claimed is:

1. A replaceable printing component comprising:
a fluid supply chamber;
a printhead comprising a memory, a plurality of test components, and a measurement circuit disposed on the printhead to measure analog performance parameters on the plurality of test components, the measurement circuit including a digital-to-analog converter coupled to at least one test component; and
an encrypted factory identification code stored in the memory that comprises a combination of digitized analog performance parameters measured on the test components.

2. The replaceable printing component of claim 1 , wherein the plurality of test components comprise at least one of a metal resistor, a polysilicon resistor, a thermal resistor, an NMOS transistor, a PMOS transistor, or any combination thereof.

3. A replaceable printing component comprising:
a fluid supply chamber;
a printhead comprising a plurality of nozzles to elect fluid drops, a memory, a plurality of test components, and a measurement circuit disposed on the printhead proximate the plurality of nozzles to measure analog performance parameters on the plurality of test components; and
an encrypted factory identification code stored in the memory that comprises a combination of digitized analog performance parameters measured on the test components.

4. The replaceable printing component of claim 3 , wherein at least one test component is to couple to a voltage source selected from the group consisting of a band gap voltage source and a pulse-width modulated voltage source.

5. The replaceable printing component of claim 3 , wherein the measurement circuit comprises a diode connected NMOS transistor to couple with a voltage source.

6. The replaceable printing component of claim 3 , wherein the digitized analog performance parameters comprise subcodes, and the encrypted factory identification code comprises a combination of the subcodes.

7. The replaceable printing component of claim 3 , wherein the printhead further comprises a switch that connects the measurement circuit to the plurality of test components.

8. The replaceable printing component of claim 3 , wherein the measurement circuit is to couple to an analog to digital converter.

9. A replaceable printing component comprising:
a fluid supply chamber;
a printhead on the fluid supply chamber, the printhead comprising a plurality of test components disposed thereon, the printhead further comprising a memory storing a factory identification code that comprises a combination of digitized analog performance parameters, and the digitized analog performance parameters measured from the test components,
wherein a first test component on the printhead is to couple to a voltage source selected from the group consisting of a band-gap voltage source and a pulse-width modulated voltage source.

10. The replaceable printing component of claim 9 , wherein the first test component on the printhead is a diode-connected NMOS transistor.

11. The replaceable printing component of claim 9 , wherein the factory identification code is encrypted using an encryption algorithm selected from the group consisting of RSA (Rivest-Shamir-Adleman), DSA (Digital Signature Algorithm), ECDSA (Elliptic Curve Digital Signature Algorithm), 3DES (Triple Data Encryption Algorithm) and AES (Advanced Encryption Standard).

12. The replaceable printing component of claim 11 , wherein the memory further stores a digital signature for decrypting the factory identification code.

13. The replaceable printing component of claim 9 , wherein the digitized analog performance parameters comprise subcodes, and the factory identification code comprises a combination of the subcodes.

14. The replaceable printing component of claim 9 , wherein the printhead comprises a measurement circuit disposed thereon to measure the analog performance parameters from the test components.

15. The replaceable printing component of claim 9 , wherein the analog performance parameters are selected from the group consisting of resistance, transistor saturation current, and transistor threshold voltage.

16. A replaceable printing component comprising:
a fluid supply chamber;
a printhead having a plurality of nozzles, the printhead comprising a plurality of test components from which to measure analog performance parameters;
a memory on the printhead, the memory storing a factory identification code that comprises a combination of digitized analog performance parameters,
wherein the digitized analog performance parameters comprise subcodes, and the factory identification code comprises a combination of the subcodes.

17. The replaceable printing component of claim 16 , wherein the combination of subcodes is selected from the group consisting of concatenated subcodes, blended subcodes, mathematically manipulated subcodes, and ratios of subcodes.

18. The replaceable printing component of claim 16 , wherein the plurality of test components are selected from the group consisting of a metal resistor, a polysilicon resistor, a thermal resistor, a PMOS transistor, and an NMOS transistor.

19. The replaceable printing component of claim 16 , wherein at least one test component is to couple to a measurement circuit comprising a digital-to-analog converter.

Assignees

• Anderson Daryl E
• Van Brocklin Andrew L
• Ward Jefferson P
• Hewlett Packard Development Co Lp

Inventors

• Anderson Daryl E
• Van Brocklin Andrew L
• Ward Jefferson P

Classifications

• B41J2/04586

  controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type · CPC title

• B41J2/04506

  aiming at correcting manufacturing tolerances · CPC title

• B41J2/17543

  Cartridge presence detection or type identification · CPC title

• B41J2/1753

  Details of contacts on the cartridge, e.g. protection of contacts · CPC title

• B41J2/0458

  controlling heads based on heating elements forming bubbles · CPC title