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Last Updated: March 28, 2024

Details for Patent: 8,567,893


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Title:Print signal generation system
Abstract: An embodiment of a print signal generation system is provided. The system comprises a sensor, a divisor processing unit, a reference signal generator, and a print trigger signal generator. The sensor detects a first offset of a first location of a medium being printed. The divisor processing unit generates a first divisor according to the first offset and a predetermined divisor. The reference signal generator generates a reference signal. The print trigger signal generator generates a print trigger signal according to the first divisor and the reference signal.
Inventor(s): Yeh; Po-Chun (Tainan County, TW), Chang; Chia-Ming (Taipei County, TW), Shih; Hung-Pin (Miaoli County, TW), Liu; Tsu-Min (Hsinchu County, TW)
Assignee: Industrial Technology Research Institute (Hsinchu, TW)
Filing Date:Jan 21, 2010
Application Number:12/691,627
Claims:1. A print signal generation system, comprising: a sensor to detect a first offset of a first location of a medium being printed and a second offset of a second location of the medium being printed; a divisor processing unit to generate a first divisor according to the first offset, the second offset and a predetermined divisor; a reference signal generator to generate a reference signal; and a print trigger signal generator to count a number of cycles of the reference signal and generate a print trigger signal when the number of cycles equals the first divisor, wherein the first and the second offsets respectively correspond to a first and a second deformation amount of the medium being printed, and wherein the first and the second deformation amounts of the medium are respectively detected by the difference between an ideal distance between two successive alignment marks on the medium and an actual distance between the alignment marks.

2. The system as claimed in claim 1, wherein the sensor further detects a third offset of a third location of the medium being printed, and the divisor processing unit generates a second divisor according to the second offset, the third offset and the predetermined divisor.

3. The system as claimed in claim 2, wherein the distance between the first location and the second location is not equal to the distance between the second location and the third location.

4. The system as claimed in claim 1, wherein the sensor is a contact sensor or a contactless sensor.

5. The system as claimed in claim 1, wherein the reference signal generator generates the reference signal according to a relative movement of a printhead module and the medium being printed.

6. The system as claimed in claim 1, wherein the print trigger signal generator further converts the first offset into a first value and the first divisor is determined according to the predetermined divisor and the first value.

7. The system as claimed in claim 6, wherein the first value is one of a positive integer number, zero or a negative integer number.

8. The system as claimed in claim 1, wherein the frequency of the reference signal is higher than a print frequency of a printhead module of the print signal generation system.

9. The system as claimed in claim 1, wherein the print signal generation system can be applied in a roll-to-roll printer or a flatbed printer.

10. The system as claimed in claim 1, wherein a second sensor detects a time offset which is determined according to an offset of a printhead module of the print signal generation system.

11. The system as claimed in claim 1, further comprising a printhead module driven by the print trigger signal.

12. A print signal generation method to control a printhead module to the print on a medium being printed, comprising: detecting a first offset of a first location; detecting a second offset of a second location; generating a first divisor according to the first offset, the second offset and a predetermined divisor; and counting a number of cycles of a reference signal and generating a print trigger signal to drive a printhead to print when the number of cycles equals the first divisor, wherein the first and second offsets respectively correspond to a first and second deformation amount of the medium being printed, and wherein the first and the second deformation amounts of the medium are respectively detected by the difference between an ideal distance between two successive alignment marks on the medium and an actual distance between the alignment marks.

13. The method as claimed in claim 12, further comprising: detecting a third offset of a third position; generating a second divisor according to the third offset, the second offset and the predetermined divisor; generating the print trigger signal according to the first divisor, the second divisor and the reference signal.

14. The method as claimed in claim 13, wherein a first distance between the first location and the second location is not equal to a second difference between the second location and a third location.

15. The method as claimed in claim 12, further comprising: detecting an offset of the printhead module; and generating a print trigger signal according to the offset, the first divisor and the reference signal.

16. The method as claimed in claim 12, wherein the reference signal is generated according to a relative movement of a printhead module and the medium being printed.

17. The method as claimed in claim 12, wherein the frequency of the reference signal is a time-variable.

18. The system as claimed in claim 1, wherein the print trigger signal drives a printhead to print on a medium.

19. A print signal generation method to control a printhead module to the print on a medium being printed, comprising: measuring a distance between two alignment marks on the medium being printed; estimating a distance error between the distance and a predetermined distance corresponding to a deformation amount of the medium being printed; generating a print trigger signal by adjusting a trigger time of an initial print trigger signal according to the distance error; and printing on the medium according to the trigger signal.

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