Light emitting control device and method thereof for light emitting diode print head

• US 8,482,589 B2
• Filed: 04/18/2010
• Issued: 07/09/2013
• Est. Priority Date: 04/18/2010
• Status: Expired due to Fees

• Current Assignee: Aetes Technology Incorporated
• Original Assignee: Aetes Technology Incorporated
• Inventors: Shen, Wei-Ming, Chang, Wen-Lung
• Primary Examiner(s): PHAM, HAI CHI
• Application Number:
  US12/762,360
• Publication Number:
  US 20110254460A1
• Time in Patent Office: 1,178 Days
• Field of Search: 347/229, 347/234, 347/235, 347/237, 347/238, 347247-250
• US Class Current: 347/237
• CPC Class Codes: H04N 1/40031 for a plurality of reproducing elements simultaneously
• CPC Class Codes: H04N 1/40056 Circuits for driving or energising particular reading heads or original illumination means H04N1/401, H04N1/407 take precedence
• CPC Class Codes: H04N 1/484 with sequential colour illumination of the original

Abstract

A light emitting control device for a light emitting diode print head includes a control unit, a pulse-mask unit, a strobe unit and a data output unit. The pulse-mask unit outputs n clock signals in sequence to a light emitting diode print head. The strobe unit outputs a strobe signal to the light emitting diode print head, so as to switch on the light emitting diode print head. The data output unit outputs a print data signal to the light emitting diode print head. When the pulse-mask unit outputs a k-th clock signal of the n clock signals, the pulse-mask unit delays the k-th clock signal for a predetermined time, and the data output unit pauses outputting the print data signal. After the predetermined time, the pulse-mask unit and the data output unit continue to output the rest of the clock signals and the print data signal.

Claims

1. A light emitting control device for a light emitting diode print head comprising:

a control unit;

a pulse-mask unit, controlled by the control unit, outputting n clock signals in sequence to the light emitting diode print head, n being a positive integer;

a strobe unit, controlled by the control unit, outputting a strobe signal to the light emitting diode print head to switch on the light emitting diode print head; and

a data output unit, controlled by the control unit, outputting a print data signal to the light emitting diode print head;

wherein when the pulse-mask unit outputs a k-th clock signal of the n clock signals, the pulse-mask unit delays the k-th clock signal for a predetermined time, and the data output unit pauses outputting the print data signal, after the predetermined time, the pulse-mask unit and the data output unit continues to output the rest of the clock signals and the print data signal, k is a positive integer smaller than or equal to n.

2. The light emitting control device of claim 1, further comprising a first counter for calculating a number of the clock signals which have been output.

3. The light emitting control device of claim 1, further comprising a second counter for calculating the predetermined time.

4. The light emitting control device of claim 1, wherein the predetermined time is r times a period of the clock signal, and r is a positive integer.

5. The light emitting control device of claim 1, wherein k is a median of n.

6. A light emitting control method for a light emitting diode print head comprising steps of:

outputting n clock signals in sequence to the light emitting diode print head, n being a positive integer;

outputting a strobe signal to the light emitting diode print head to switch on the light emitting diode print head;

outputting a print data signal to the light emitting diode print head;

delaying a k-th clock signal of the n clock signals for a predetermined time, and pausing outputting the print data signal, k being a positive integer smaller than or equal to n; and

after the predetermined time, continuing to output the rest of the clock signals and the print data signal.

7. The light emitting control method of claim 6, further comprising step of calculating a number of the clock signals which have been output while outputting the n clock signals in sequence.

8. The light emitting control method of claim 6, further comprising step of calculating the predetermined time while delaying the k-th clock signal.

9. The light emitting control method of claim 6, wherein the predetermined time is r times a period of the clock signal, and r is a positive integer.

10. The light emitting control method of claim 6, wherein k is a median of n.