The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "The disclosure relates to a diode array structure, and more particularly to a light emitting diode (LED) array structure, and a printing head and a printing device thereof.
"A photocopier, a printer, a fax machine, and a multifunction peripheral use electro-photography as a core technology for printing a document; that is, the devices generate a photographic image by changing the distribution of electrostatic charges through light with a specific wavelength.
"Please refer to FIG. 1, which is a schematic view of a LED printer 100 for color printing. The LED printer 100 has photoconductive drums (110K, 110M, 110C, and 110Y, referred to in sum as 110), printing heads (120K, 120M, 120C, and 120Y, referred to in sum as 120), and toner cartridges (130K, 130M, 130C, and 130Y, referred to in sum as 130), corresponding to black, magenta, cyan, and yellow respectively. Through a power distribution mechanism, a layer of uniform charges is generated on a surface of the photoconductive drum 110. In a scan procedure before printing, an exposure procedure is required to makes pixels of a pattern in a document to be printed convert to light and shade data of the visible light. The printing head 120 has a plurality of LEDs arranged along a one-dimensional direction. When light emitted by the LEDs is irradiated onto the photoconductive drum 110, potential of an unexposed area remains unchanged, but charges of an exposed area vary due to exposure. The variation of the potential of the exposed area may absorb carbon powder which is provided by the toner cartridge 130 and carries positive and negative charges, so as to achieve an objective of printing.
"To improve the printing resolution, the LEDs in the printing head 120 are arranged tightly. For example, to reach a printing resolution of 600 DPI (Dots Per Inch), an interval of 42.3 .mu.m between the LEDs is required. However, the area of an LED is further limited, and a light emission amount of the LED is limited. Therefore, how to improve the area of the LED to raise the light emission amount of the LED is a research subject of the researchers in the art."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "In view of the above problems, the disclosure provides a light emitting diode (LED) array structure, and a printing head and a printing device thereof, so as to raise a light emission amount of an LED and improve photoconductivity and printing speed.
"An embodiment of the disclosure provides an LED array structure, including a substrate and a plurality of light emitting thyristors. The light emitting thyristors are located at the substrate and arranged linearly. Each light emitting thyristor includes a strip portion and a plate portion connected to each other, and the plate portions of the adjacent light emitting thyristors are staggered with each other.
"An embodiment of the disclosure further provides a printing head, including the foregoing LED array structure.
"An embodiment of the disclosure further provides a printing device, including a photoconductive drum, a lens, and a printing head with the foregoing LED array structure. The lens is located between the photoconductive drum and the printing head, and is used to focus light emitted by the printing head on the photoconductive drum.
"To sum up, in the LED array structure, and the printing head and the printing device thereof according to the disclosure, the plate portions of the two adjacent light emitting thyristors in the LED array structure are located at different positions of the corresponding strip portions respectively. In this manner, an arrangement density of the light emitting thyristors is maintained and a distribution area of the light emitting thyristors is increased, so as to raise a light emission amount of the light emitting thyristors and then improve photoconductivity and printing speed of the printing device.
BRIEF DESCRIPTION OF THE DRAWINGS
"The disclosure will become more fully understood from the detailed description given herein below for illustration only, and thus not limitative of the disclosure, wherein:
"FIG. 1 is a schematic view of a conventional light emitting diode (LED) printer for color printing;
"FIG. 2 is a schematic view of photoconductivity of a printing device according to an embodiment;
"FIG. 3 is a schematic view of appearance of a printing head according to an embodiment;
"FIG. 4 is a schematic view of a circuit of a light emitting chip according to an embodiment;
"FIG. 5 is a schematic view of clock signals received by a light emitting chip according to an embodiment;
"FIG. 6 is a schematic view of an LED array structure according to an embodiment;
"FIG. 7 is a sectional view along an A-A line according to FIG. 6;
"FIG. 8 is a sectional view along a B-B line according to FIG. 6;
"FIG. 9 is a sectional view along a C-C line according to FIG. 6;
"FIG. 10 is another schematic view of an LED array structure according to an embodiment;
"FIG. 11 is further another schematic view of an LED array structure according to an embodiment; and
"FIG. 12 is still another schematic view of an LED array structure according to an embodiment."
For additional information on this patent application, see: Chang, Tz-Liang; Peng, Po-Hsiung. Light Emitting Diode Array Structure, and Printing Head and Printing Device Thereof. Filed
Keywords for this news article include: Electronics, Light-emitting Diode,
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