KR0143123B1 - Light emitting diode printer head - Google Patents

Abstract

The light emitting diode array chip 62 and the driving integrated circuit are connected to each other by bonding wires, and printed circuit boards 61 and screw holes are formed on the left and right sides thereof, to support the printed circuit board 61. The housing 63, the adjuster 65 which is inserted through the screw holes formed on the left and right sides of the housing 63 and moves forward and backward, and the left and right bottom edges are formed in a tapered shape. It is composed of a cell width lens array 64 for focusing the light emitted from the light emitting diode array chip 61 to the drum while converting the forward and backward operation of the adjuster 65 into a rising and falling operation. After the adjuster is installed on the left and right sides of the housing, the forward and backward movements of the adjuster are converted into vertical up and down movements to move the cell width lens array. It relates to a light emitting diode printer head with an effect that is easily.

Description

Light emitting diode printer head

1 is a side cross-sectional view of a conventional light emitting diode printer head,

2 is a front sectional view of a conventional light emitting diode printer head,

3 to 5 are diagrams for explaining the proper position of the cell-width lens array used in the conventional LED printer head,

6 is a front sectional view of a light emitting diode printer head according to the first embodiment of the present invention,

7 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a first embodiment of the present invention;

8 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a second embodiment of the present invention;

9 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a third embodiment of the present invention;

10 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a fourth embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

61: printed circuit board 62: light emitting diode array chip

63: housing 64, 84, 94, 104: cell-width lens array

65, 85, 95, 105, 106: Adjuster

The present invention relates to a light emitting diode printer head, and more specifically, the adjustment work is performed by shifting the cell width lens array by converting the adjuster's forward and backward movements into vertical up and down movements after installing the adjusters on the left and right sides of the housing. A light emitting diode printer head can be easily made.

In general, a light emitting diode printer head uses an electrophotographic method that emits light by receiving a predetermined signal, and its application field is applied to the same original such as an electronic copy machine, a PP facsimile, and a desk top printer (DTP). It is a part that is widely applied to an apparatus for making a plurality of copies and to an OA apparatus such as a general printer. Such a technology for a light emitting diode printer head has been disclosed in LENS ADJUSTMENT FOR ALIGHT ENITTING DIODE PRINTER HEAD of US Patent No. 4,904,862 (registered date: February 27, 1990).

Hereinafter, a light emitting diode printer head will be described with reference to the accompanying drawings.

1 is a side cross-sectional view of a conventional light emitting diode printer head, and FIG. 2 is a front sectional view of a conventional light emitting diode printer head.

As shown in Figs. 1 and 2, a conventional light emitting diode printer head has a light emitting diode array chip (2) and a driving integrated circuit (3) mounted on a printed circuit board (1). Connecting the array chip 2 and the driving integrated circuit 3 with a bonding wire 4, attaching a resistor 5 for correcting the output current, condensing the heat sink 6 and the emitted light to the drum. A self-aligning lens cell array (SLA) 7 is attached to the housing 8, and an adjuster 11 is installed at the bottom of the housing 8 to adjust the position of the cell-width lens array 7. In addition, the housing 8 and the printed circuit board 1 has a structure in which a spring 9 is installed.

The printed circuit board 1 mounts the LED array chip 2 and the driving integrated circuit 3 side by side in the same quantity in two columns. The LED array chip 2 and the driving direct circuit 3 mounted as described above are connected to each other by a bonding wire 4 for a residue connection, and the driving integrated circuit 3 is a bonding wire 4 as a printed circuit board. It is connected to (1) so that it is electrically connected to an external system. The operation principle of the conventional light emitting diode printer head by the above configuration is as follows.

The light emitting diode printer head is a non-impact printing method, and a plurality of light emitting diode array chips 2 are arranged in a line in the center of the printed circuit board 1 and used as light emitting factors. Among the light emitting diode array chips 2, light generated by the driven light emitting diodes is focused on the surface of the drum 10 through the cell width lens array 7. The charged surface of the drum 10, which receives the light, is discharged. As the drum 10 rotates, the discharged portion is printed on paper while passing through the developer, the transfer machine, the fuser, and the like. 3 to 5 are diagrams for explaining an appropriate position of a cell width lens array used in a conventional light emitting diode printer head. As shown in FIG. 3, the distance from the center position of the cell width lens array 7 of the light emitting diode printer head, that is, the center of the cell width lens array 7 to the drum 10 and the LED array chip 2 (a) must be equal to each other so that the light emitted from the LED array chip 2 can be delivered to the drum 10 in the upright equilibrium phase.

However, as shown in FIG. 4, the center position of the cell width lens array 7 is oriented toward DELTA l toward the light emitting diode array chip 2, or the cell width lens array 7 is shown in FIG. When the center position of the light source is Δℓ toward the drum 10, the light emitted from the LED array chip 2 is not transmitted exactly to the drum 10, and the light is not focused so that the output, that is, MTF (Modulation Transfer) Function falls off significantly.

The MTF is an optical information transfer function introduced to match the visual and spatial frequency characteristics of a human being. The MTF is used to quantify a mechanism of an image image for each of a lens, an image sensor, or a light source in a scanner or an image input / output system. .

Therefore, the center position of the cell width lens array 7 is very important for the light emitted to the LED array chip 2 to be accurately transmitted to the surface of the drum 10.

As a method for minimizing light output variation in a device of a light emitting diode printer head, a method of fixing a cell width lens array using an adhesive after adjusting the cell width lens array, and a method of fixing the cell width lens array in an injection mold (Korean patent) Patent Application No. 91-16412), but in order to fabricate a high quality light emitting diode printer head in an optimal state, it is better to fix the cell width lens array and then fix it with an adhesive. Conventionally, the cell width lens array 7 is located at the center of the light emitting diode array chip 2 and the drum 10, and the user is provided at the bottom of the housing 8, as shown in FIG. The adjuster 25 is used to adjust the cell width lens array 7 up and down from the bottom to optimize the MTF.

Next, the unfixed cell width lens array 7 is fixed with the housing 8 by using an adhesive to prevent it from moving. However, as described above, the conventional method for adjusting the cell width lens array has a disadvantage in that the assembling operation is difficult because the cell width lens array has to be adjusted with the adjuster located on the bottom of the cell width lens array.

In addition, in the conventional method for adjusting the cell width lens array, when a bolt is used as the adjuster, dust generated by the friction between the housing and the adjuster falls on the adjacent LED array chip, thereby reducing the emission area of the drum. There is a problem that the exposure amount irradiated to the light source becomes insufficient and the operating characteristics are lowered. An object of the present invention is to solve the above-mentioned disadvantages and problems, and after the adjuster is installed on the left and right sides of the housing, the forward and backward movements of the adjuster are converted into vertical up and down movements to thereby convert the cell width lens array. The present invention provides a light emitting diode printer head which can be easily adjusted by moving.

As a means for achieving the above object, the constitution of the present invention is a printed circuit board in which a light emitting diode array chip and a driving integrated circuit are connected to each other by bonding wires, and screw holes are formed on left and right sides thereof. The controller for supporting the circuit board, the adjuster inserted through the screw holes formed on the left and right sides of the housing and moving forward and backward, and the lower left and right lower edges are formed in a tapered shape so that the front and rear of the adjuster are formed. It is composed of a cell width lens array (SLA) for focusing the light emitted from the light emitting diode array chip to the drum while converting the oscillation operation to the up, down operation.

The left and right bottom surfaces of the cell width lens array may be roundly curved, and the end portion of the adjuster may be correspondingly rounded. In addition, the left and right upper and lower surfaces of the cell-width lens array may both be processed in a tapered form, and the adjuster may be configured to use two correspondingly. In addition, the left and right upper and lower surfaces of the cell-width lens array may be roundly curved, and the adjuster may have a structure in which two ends are curvedly rounded correspondingly. Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

6 is a front sectional view of a light emitting diode printer head according to the first embodiment of the present invention,

7 is an enlarged view of the cell width lens array of the light emitting diode printer head according to the first embodiment of the present invention.

As shown in FIG. 6 and FIG. 7, the configuration of the LED printer head according to the first embodiment of the present invention includes a print in which the LED array chip 62 and the driving integrated circuit are connected to each other by bonding wires. Screw holes are formed in the substrate 61, left and right side surfaces, the housing 63 for supporting the printed circuit board 1, and the screw holes formed in the left and right side surfaces of the housing 8, respectively. The adjuster 65 which is inserted through and moves forward and backward, and the left and right lower edges are formed in a tapered shape, and the forward and backward movement of the adjuster 65 is converted into a rising and lowering motion and moved vertically. And a cell width lens array 64 for focusing light emitted from one LED array chip 62 onto a drum. The adjuster 65 has a screw thread formed on the outer circumferential surface thereof, and is engaged with the screw hole provided on the left and right sides of the housing 63 to move forward and backward. The operation of the light emitting diode printer head according to the first embodiment of the present invention by the above configuration is as follows.

The user rotates the adjuster 65 in the forward direction to advance the adjuster 65 toward the cell width lens array 64 through the screw hole of the housing 63.

When the adjuster 65 proceeds in the direction of the cell width lens array 64, the adjuster 65 pushes up the left and right side taper portions of the cell width lens array 64 so that the cell width lens array 64 is vertically raised.

On the contrary, if the user rotates the adjuster 65 in the reverse direction, the adjuster 65 is reversed in the opposite direction to the cell width lens array 64 through the screw hole of the housing 63. When the adjuster 65 is reversed in the opposite direction to the cell width lens array 64, the cell width lens array 64 is brought down by its own weight so that the cell width lens array 64 is vertically lowered. By using the upward and downward movements of the cell-width lens array 64, the user can easily optimize the MTF.

The left and right side tapered portions of the adjuster 65 and the cell-width lens array 64 may be implemented in other forms. FIGS. 8 to 10 illustrate various forms of the tapered portions of the adjuster and the cell-width lens array. . 8 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a second embodiment of the present invention. As shown in FIG. 8, in the light emitting diode printer head according to the second embodiment of the present invention, the left and right bottom surfaces of the cell width lens array 84 are rounded, and the ends of the adjuster 85 are also corresponding thereto. It is made of a structure that is roundly curved.

As the structure of the cell width lens array 84 in the light emitting diode printer head according to the second embodiment of the present invention is the same as the first embodiment, detailed description thereof will be omitted.

9 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a third embodiment of the present invention. As shown in FIG. 9, in the light emitting diode printer head according to the third embodiment of the present invention, both the upper and lower left and right sides of the cell width lens array 94 are tapered, and the adjusters 95 and 96 are provided. ) Corresponds to the structure using two. According to the above structure, in the light emitting diode printer head according to the third embodiment of the present invention, the cell width lens array 94 is lowered by the adjuster 95 on the upper surface, and the cell width by the adjuster 96 on the lower surface. The operation procedure is similar to that of the first embodiment except that the lens array 94 is raised.

10 is an enlarged view of an adjuster and a cell width lens array of a light emitting diode printer head according to a fourth embodiment of the present invention. As shown in FIG. 10, in the light emitting diode printer head according to the fourth embodiment of the present invention, both the upper and lower left and right surfaces of the cell width lens array 104 are rounded, and the adjusters 105 and 106 are disposed. Correspondingly, it consists of a structure that uses two rounded ends.

According to the above structure, in the light emitting diode printer head according to the fourth embodiment of the present invention, the cell width lens array 104 is lowered by the adjuster 105 on the upper surface, and the cell width by the adjuster 106 on the lower surface. The operation procedure is similar to that of the first embodiment except that the lens array 104 is raised.

As described above, in the embodiment of the present invention, after the adjuster is installed on the left and right sides of the housing, the adjusting operation can be easily performed by shifting the cell width lens array by converting the adjuster's forward and backward movements into vertical up and down movements. It is possible to provide a light emitting diode printer head having an effect. This effect of the present invention can be used by those skilled in the art of light emitting diode printers.

Claims (5)

A printed circuit board in which a light emitting diode array chip and a driving integrated circuit are connected to each other by bonding wires, and a screw hole is formed on left and right sides, and a housing for supporting the printed circuit board, and a left and right side surfaces of the housing. The adjuster is inserted through the screw hole formed in the to move forward and backward, and the left and right lower corners are formed in a tapered shape, and the forward and backward movements of the adjuster are converted into a rising and lowering motion and moved vertically. A light emitting diode printer head comprising a cell lens array (SLA) for connecting light emitted from the light emitting diode array chip to a drum. The light emitting diode printer head of claim 1, wherein left and right bottom surfaces of the cell width lens array are rounded, and the ends of the adjuster are rounded. The light emitting diode printer head of claim 1, wherein the upper and lower surfaces of the left and right sides and the lower surface of the cell-width lens array are both tapered, and the adjuster is correspondingly configured to use two. . The method of claim 1, wherein the left and right upper and lower surfaces of the cell-width lens array are curved in a round shape, and the adjuster has a structure in which two ends are curved correspondingly. Light emitting diode printer head. The light emitting diode printer head according to any one of claims 1 to 4, wherein a screw thread is formed on an outer circumferential surface of the adjuster to be coupled to a screw hole of the housing.