JPS60230627A - Circuit board for led array - Google Patents

Abstract

PURPOSE:To improve positioning precision by providing reference positioning projections to the circuit board, and using those projections as position references when LED chips are die-bonded and the LED array is mounted on an image reader body. CONSTITUTION:The reference projections 7 are formed integrally on the circuit substrate 1 for the LED array. Therefore, those projections are used as common positioning references in respective manufacture processes of patterning on the circuit board 1, die bonding of the LED chips, boring of fitting holes 6, etc. In this case, the reference projections 7 are used even as positioning reference at the time of the fitting of the LED array to the image reader body, so errors in positioning precision are reduced extremely and the positioning precision of fitting and fixation is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit board for an LED array. For more information,
The present invention relates to a circuit board for an LED array of an IJD array used for illuminating the document surface of an image reading device such as a facsimile machine or a copying machine, and particularly to a circuit board for an LED array that can be easily positioned and fixed to a light receiving surface.

[Prior art]

In recent years, with the development of electronic technology, various image transmission systems and image processing systems are becoming popular.

In this type of system, an image reading device that inputs image information as an optical signal and outputs it as an electrical signal is an important device that influences the performance of the entire system. For this reason, there is a strong need to develop an image reading device with excellent performance. Along with this, an LED array in which a plurality of LED chips are arranged has been newly used for illuminating the document surface of the image reading device due to problems such as miniaturization, cost reduction, and reduction in heat generation. In such an LED array, L
The light generated from the ED chitno is focused on the center of the light-receiving surface by the condenser lens, forming a peak in the illuminance distribution, but the peak of the illuminance distribution on the light-receiving surface is sharp, and the area where high illuminance can be obtained is at the center of the light-receiving surface. Therefore, when using this LED array to illuminate a document in an image reading device, the entire light-receiving surface of the document should be used, and the part of the document to be read should be placed in the center of the light-receiving surface where the highest illuminance can be obtained. Must be used in unison. As a means of mounting and fixing in this case,
The LED array was attached to the image reading device main body 20 with screws 25 as shown in FIG. However, conventionally, as shown in FIG. 5, attaching the mounting 9 for positioning and fixing requires separate processes for drilling the hole 6 and die-dending for joining the LED chip 2 to the circuit board 1.
During installation, the positional accuracy of the hole 6 and the LED chip 2 was not good. Therefore, since the positioning accuracy of the condensing lens 3 is determined by the positioning accuracy of the circuit board 1 and the support member 4 and the positioning accuracy of the circuit board 1 and the image reading device main body 20, the position of the condensing lens 3 with respect to the document surface It was difficult to achieve accuracy.

Furthermore, when the image reading device main body 20 is equipped with an LED array mounting hole, the accuracy of positioning the LED array with respect to the document surface is determined by the accuracy of the hole 21. For example, long,
If only a notch etc. is provided, the LED array 26
It is difficult to mount the circuit board 1 with high positional accuracy, and if you try to use the outer shape of the circuit board 1 of the LED array 26 as a positioning reference as another positioning means, for example, the outer shape of the circuit board 1 and the Hole 6 and L for mounting 9
Due to poor positional accuracy with the ED chip 2, the LED array 2
6 to the image reading device main body 20 with high positional accuracy.

Also, die-dending of the LED chip 2 to the circuit board 1 of the LED array, and the image reading device body 2 of the LED array.
0 to the circuit board 1, the drilling of the hole 6 is the process, and the image reading device main body 20 of the LED play.
There was an inconvenience in that it was difficult to determine their mutual positions when attaching them to the . Therefore, the LED array circuit board requires a common reference point for positioning.

[Purpose of the invention]

The object of the present invention is to solve the above-mentioned drawbacks, to have a simple structure, and to
It is an object of the present invention to provide a circuit board for an LED array that improves the positioning accuracy of an ED array with respect to a document surface and an image reading device main body, and facilitates mounting and fixing.

[Summary of the invention]

An object of the present invention is to provide a positioning reference protrusion on an LED array circuit board of an LED array, and to attach the protrusion to the circuit board by forming a hole, die bonding the LED chip, and performing image reading device main body of the LED array. [Embodiment] An embodiment of the LED array circuit board of the present invention will be described with reference to the drawings.

Figure 2 shows an LBD array according to the present invention (
(a) is its top view, (b) is its front view, and (C) is its side view.

In the LED array shown in FIG.
ED chip; 3 is a condenser lens that condenses the light emitted from the IJD chip 2; 4 is a support member provided on both sides of the circuit board 1; Support members provided on both sides, reference numeral 6 are mounting holes provided on the circuit board 1, and reference numeral 7 are projections for positioning reference formed integrally with the circuit board 1.

FIGS. 3 and 4 show schematic configuration diagrams of this embodiment when the LED array is attached to the image reading device main body 20.

3 and 4, 1 is a circuit board, 6 is a mounting hole provided on the circuit board 1, 7 is a positioning projection formed integrally with the circuit board 1, and 20 is the main body of the image reading device. , 25 is the screw for the LED array mounting, 26 is L
The positioning protrusion 7 of the ED array 27 is guided by an IJD array positioning reference recess provided in the image reading apparatus main body 20 so as to correspond to the positioning protrusion 7. 28 is LE
The LED array mounting holes provided in the image reading device main body 20 are elongated holes that correspond to the mounting holes 6 for the D array.

In the LED array circuit board of the LED array of this embodiment shown in FIG. 2, since the positioning reference projection 7 is integrally formed on the circuit board 1 in advance, the circuit board 1
The patterning of the LED chip 2, the die bonding of the LED chip 2, and the drilling of the hole 6 for mounting can be used as a common positioning reference in each manufacturing step.

Further, the LεD array 26 using the circuit board 1 on which the positioning reference protrusion 7 is integrally formed is attached to the image reading device 20.
As shown in FIGS. 3 and 4, when installing the image reading device main body 20, there is a positioning reference recess 27 at a position corresponding to the positioning reference protrusion 7 and a mounting hole 6 corresponding to the positioning reference protrusion 7. Provide an elongated hole 21 for installing the LED play at the position shown in the figure.
The positioning reference protrusions 7 and the positioning reference recesses correspond to each other, and the IJD array 26 is guided, positioned, and fixed to the image reading apparatus main body 20. After that, use the screw 25 etc. to attach the LED.
By fixing the array 26 to the image reading device main body 20, mounting and fixing with extremely improved positional accuracy can be achieved.

In the above embodiment, a cylindrical positioning reference protrusion is illustrated, but the shape and number of the protrusions are not limited to this. For example, a square columnar protrusion may be used, and the embodiments are not limited to this. isn't it.

Further, in the above embodiment, the positioning reference protrusion is formed integrally with the circuit board, but the positioning reference protrusion may be entirely formed with another member and bonded to the circuit board by adhesive or other means. , materials, etc. may be used as appropriate, and are not limited to the present embodiment.

〔Effect of the invention〕

According to the present invention, positioning reference protrusions are provided on the circuit board of the LED array, and these are used for four-turning on the circuit board, die bonding of LED chips, and drilling of holes for attaching mounting holes. In the manufacturing process, it is not only used as a positioning reference point, but also as a positioning reference when attaching the IJD array to the main body of the image reading device. A circuit board for an LED array with improved positional accuracy and easy loading into the main body of the device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of an image reading device using a conventional IJD array. Figure M2 is a schematic configuration diagram of an LED array according to an embodiment of the present invention, (,) is a top view, (b) is a front view, (
C) is a side view, and FIG. 3 is a schematic configuration explanatory diagram when the LED array of FIG. 2 is mounted and fixed to the main body of the image reading apparatus. FIG. 4 is a side view of the LED array shown in FIG. 3 when it is attached and fixed to an image reading device. FIG. 5 is a schematic diagram of a conventional LED array. DESCRIPTION OF SYMBOLS 1... Circuit board, 2... LED chip, 3... Condenser lens, 4... Support member, 5... Support member, 6...
...Mounting hole, 7.Protrusion for positioning reference, 20.
...Image reading device body, 21...Elongated hole for LED array mounting, 25...Screw for LED array mounting, 26
... LED array, 27 ... LED array positioning reference recess s1 Figure 2 @ Figure 3 Figure 4

Claims (1)

[Claims] (1) Multiple L die-bonded on a circuit board
In a circuit board for an IED array of an LED array consisting of an ED chip, a support member provided on the circuit board, and a condensing lens supported by the support member, a positioning reference protrusion is provided on the circuit board, and the protrusion A circuit board for an LED array, wherein the mounting of the circuit board is performed by providing a hole, die bonding the LED chip, and using the LED array as a position reference when mounting the LED array on the main body of the image reading device.