JPH089968Y2 - Image reading illuminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an image reading illumination device such as a facsimile or a copying machine.

[Conventional technology]

2. Description of the Related Art Conventionally, when reading an image on a document surface in a facsimile, a copying machine, or the like, while moving the document relatively in one direction, for example, a light emitting diode is provided along a scanning direction orthogonal to the moving direction of the document. An image reading illumination device using an array or a light emitting diode chip (hereinafter, referred to as an LED) irradiates a linear illumination light, and the reflected light reflected by the document is received by a light receiving device via a SELFOC lens or the like. For example, by reading while scanning in the scanning direction with a CCD, the above-described reading operation is sequentially repeated in accordance with the movement of the document to read the image on the document surface.

The above-mentioned image reading illumination device is configured, for example, as shown in FIG. That is, the image reading illumination device 1
Is an LED 3 mounted as an example along the longitudinal direction on a flat substrate 2 extending in the longitudinal direction and provided with a predetermined wiring pattern for the LED, and a glass plate arranged above the LED 3. (Or a convex lens) 4 and a lamp house 5 that prevents light from the LED 3 from leaking laterally.

[Problems to be solved by the invention]

However, the image reading illumination device 1 configured as described above includes the LED chips and the substrate 2 that form the LED 3.
Since wire bonding is performed between the wiring pattern and the wiring pattern provided above, and this wire projects above the substrate 2, when the glass plate 4 or the like is subsequently placed, the wire is cut during the work. I may end up doing it.

Therefore, it is necessary to resin-mold the wire portion beforehand so that the wire is not touched during the work. Also, since the lamp house 5 is necessary to prevent the light emitted from each LED chip from leaking to the side,
The number of assembling steps was large and the production cost was high.

The present invention does not cut the wire between the LED chip and the wiring pattern of the substrate when mirroring the glass plate and mounting the glass plate etc. on the above points, and the production cost is reduced by the simple configuration. It is an object of the present invention to provide a lighting device for reading an image.

[Means and Actions for Solving Problems]

According to the present invention, the above-mentioned object is to mount an original, which is relatively moved in one direction, on a substrate extending in a longitudinal direction orthogonal to the moving direction and on the upper surface of the substrate along one side thereof. An image reading illuminating device that irradiates a line-shaped illumination light extending in the scanning direction onto the surface of the original, and the LED of the substrate along the longitudinal direction of the substrate. The part that should be attached is
The LED is mounted integrally in a concave shape lower than the other parts of the substrate so as to accommodate the LED, the LED is mounted in the concave part, and the wiring pattern is formed so as to be located on the inner wall of the concave part. This is achieved by an image reading illumination device in which a glass plate or a lens having a flat bottom surface is brought into contact with another portion of the substrate to cover the LED.

According to this invention, in the portion where the LED of the substrate is to be attached, it is formed in a concave shape lower than other portions,
Since the LED is attached to this concave part, the LED
The wires bonded to the chips of the LEDs constituting the above will be accommodated in the concave portion of the substrate.
Therefore, since the LED does not project onto the substrate, when mounting the glass plate or the convex lens, the lower surface of the glass plate or the like may be brought into contact with the other portion of the substrate. There is no possibility of cutting the wire, which eliminates the need for resin molding of the wire portion. further,
Since the wiring pattern is formed on the inner wall of the concave portion of the substrate, the inner wall surface is a reflection surface for guiding the emitted light upward, and the light emitted laterally from the LED chips constituting the LED. Since the light is cut and the light is reflected upward, the lamp house is not required and the luminous efficiency of the image reading illumination device is improved. Moreover, since the concave portion of the substrate can be formed simultaneously with the punching of the substrate, the workability is improved without increasing the number of steps.

〔Example〕

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

FIG. 1 shows an embodiment of an image reading illuminating device according to the present invention. The image reading illuminating device 10 moves in a moving direction with respect to a document (not shown) which is relatively moved in one direction. It has a substrate 11 extending in the longitudinal direction orthogonal to the substrate and formed as described below. The LED 12 is attached along the longitudinal direction of the upper surface of the substrate 11, and the glass plate 13 is arranged above the LED 12.

As shown in FIG. 2, the substrate 11 has an insulating layer 22 such as an epoxy resin formed on the surface of a plate material 21 made of a material that can be easily processed, for example, a material such as aluminum, and further a thin copper film thereon. Is formed and a predetermined wiring pattern 23 is formed by etching.

After performing the above operation on the flat plate member 21, the substrate 11 has a lower region along the longitudinal direction where the LED 12 of the substrate 11 should be attached as shown in the figure than other portions, and is sufficient to accommodate the LED 12. The concave portion 11a having various depths is formed by, for example, press molding. At this time, the wiring pattern for the chips of each LED that constitutes the LED 12 is positioned within the concave portion 11a. Further, if the substrate 11 is formed by punching out a plurality of substrates 11 from a single large plate material 21 and the concave portion 11a is formed simultaneously with the punching of the substrate 11, the number of steps may increase. Without
The concave portion 11a will be formed very easily.

The LED 12 is mounted in the concave portion 11a of the substrate 11 and the LE
After performing necessary wire bonding on the chips of each LED constituting D12, a glass plate 13 is placed and fixed on the substrate 11. In this case, when the LED 12 is mounted on the concave portion 11a of the substrate 11, the LED 12 can be completely accommodated in the concave portion 11a, so that the glass plate 13 is brought into contact with the upper surface of the other portion of the substrate 11. Moreover, the lower surface of the glass plate 13 does not touch the wires bonded to the chips of the LEDs constituting the LED 12, and therefore the wires are not cut during the operation. Therefore, it is not necessary to mold at least the periphery of the bonded wire with resin.

FIG. 3 shows another embodiment of the present invention, which is a substrate 11
A plurality of concave portions 11b are formed in a straight line on the inner surface of each of the concave portions 11b, and LEDs are housed in the respective concave portions 11b. In addition,
A wiring pattern 23 is provided in the recess 11b via an insulating layer 22 as in the previous embodiment (see FIG. 4).

The image reading illumination device according to the present invention is constructed as described above. The image reading illumination device 10 operates in the same manner as the conventional image reading illumination device 1 shown in FIG. Since it is mounted on the substrate 11 in a state that it is completely accommodated in the concave portion 11a formed along the longitudinal direction of 11, the light emitted laterally from the LED chips constituting this LED 12 is , The concave portion 11a of the substrate 11
It will be blocked by the side wall of the document and will not leak to the side, but on the contrary it will be reflected by the side wall and proceed upward as shown in the figure, which will contribute to the illumination of the original document not shown. The illumination efficiency of the image reading illumination device 10 is improved.

[Effect of device]

As described above, according to the present invention, the concave portion of the substrate is
Since the LEDs are attached, each LED that makes up the LED
The wire bonded to the chip is housed in the concave portion of the substrate, and does not need to protrude onto the substrate.

Therefore, when placing a glass plate or convex lens,
Since it suffices to bring the lower surface of the glass plate or the like into contact with the other portion of the substrate, there is no possibility of cutting the wire at this time. This eliminates the need for resin molding of the wire portion.

Furthermore, since the inner wall of the concave portion of the substrate cuts light emitted laterally from each LED chip that constitutes the LED and reflects it upward, a lamp house is not required and the image reading illumination is used. The luminous efficiency of the device will be improved. Moreover, since the concave portion of the substrate can be formed simultaneously with the punching of the substrate, there is an advantage that the number of steps is not increased and the workability is good.

Thus, according to the present invention, the wire between the LED chip and the wiring pattern of the substrate is not cut when the glass plate or the like is placed, and the production cost can be reduced by the simple configuration. An excellent image reading illumination device can be provided.

[Brief description of drawings]

1 is a schematic side view showing an embodiment of an image reading illumination device according to the present invention, and FIG. 2 is an enlarged sectional view of a substrate in the embodiment of FIG. FIG. 3 is a partially omitted external view of another embodiment of the device of the present invention, and FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a schematic side view showing an example of a conventional image reading illumination device. 10 ... Image reading illumination device; 11 ... Substrate; 11a, 11b ... Recessed part; 12 ... LED array; 13 ... Glass plate; 21 ... Plate material; 2
2 ... Insulating layer; 23 ... Wiring pattern.

Claims (1)

[Scope of utility model registration request] 1. A substrate extending in a longitudinal direction orthogonal to a moving direction of a document which is relatively moved in one direction, and an LE mounted on one surface of the substrate along one end thereof.
In the image reading illumination device that includes D and irradiates the surface of the original document with linear illumination light extending in the scanning direction, along the longitudinal direction of the substrate, a portion to which the LED of the substrate is to be attached is It is integrally formed in a concave shape lower than the other parts of the substrate so as to accommodate the LED, the LED is mounted in the concave part, and a wiring pattern is formed so as to be located on the inner wall of the concave part. An image reading illumination device, characterized in that a glass plate or a lens having a flat bottom surface is brought into contact with another portion of the substrate to cover the LED.