Granted Patent B2

US 7,894,732 · App. 12/039,196 · Granted Feb 22, 2011

Abstract

Claims (24)

1. A method comprising:

depositing a toner patch including a toner having a given excitation wavelength and a given emission wavelength onto a control surface;

providing light onto said toner patch from a light source, wherein said provided light is modulated and said light source intermittently ceases to provide said light for a given time period;

detecting at least a portion of light emitted from said toner patch at said given emission wavelength by a detector, wherein said emitted light is not detected until at least 100 ns after said light source has ceased to provide said light; and

adjusting an operating parameter of an imaging device based on said detected emitted light, the operating parameter comprising one or more of the following: developer roller bias, photoconductor bias, laser printhead intensity, laser printhead power, and image formation speed.

2. The method of claim 1 , wherein said given excitation wavelength is different from said emission wavelength.

3. The method of claim 1 , wherein said detector does not detect light provided by said light source.

4. The method of claim 1 , wherein said given excitation wavelength is in the range of about 700 nm to about 3,000 nm.

5. The method of claim 1 , wherein said given emission wavelength is in the range of about 700 nm to about 3,000 nm.

6. The method of claim 1 , wherein said given excitation wavelength is higher than said detector is capable of detecting.

7. The method of claim 1 , wherein said given excitation wavelength is lower than said detector is capable of detecting.

8. The method of claim 1 , wherein said excitation wavelength is at least 100 nm greater than 1150 nm and said emission wavelength is at least 100 nm less than 1150 nm.

9. An imaging system comprising:

a toner composition having a given excitation wavelength and a given emission wavelength;

a toner patch sensor capable of providing light from a light source onto said toner and detecting at least a portion of light emitted from said toner at said given emission wavelength by a detector and generating a signal, wherein said light source is capable of modulating the light, said light source intermittently ceases to provide light for a given time period and said toner patch sensor begins to detect said emitted light at least 100 ns after said light source has ceased to provide light; and

a controller capable of receiving said signal and varying a system operating parameter based on said signal, the operating parameter comprises one or more of the following: developer roller bias, photoconductor bias, laser printhead intensity, laser printhead power, and image formation speed.

10. The system of claim 9 , wherein said given excitation wavelength is different from said given emission wavelength.

11. The system of claim 9 , wherein said detector does not detect light provided by said light source.

12. The system of claim 9 , wherein said given excitation wavelength is in the range of about 700 nm to about 3,000 nm.

13. The system of claim 9 , wherein said given emission wavelength is in the range of about 700 nm to about 3,000 nm.

14. The system of claim 9 , wherein said toner patch sensor further comprises a filter capable of absorbing or reflecting said light of said given excitation wavelength.

15. The system of claim 9 , wherein said light source is capable of providing light of a higher wavelength than said detector is capable of detecting.

16. The system of claim 9 , wherein said light source is capable of providing light of a lower wavelength than said detector is capable of detecting.

17. The system of claim 9 , wherein said excitation wavelength is at least 100 nm greater than 1150 nm and said emission wavelength is at least 100 nm less than 1150 nm.

Assignments (8)