JP3181012B2 - Document reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact type original reading apparatus used for a facsimile or the like.

[0002]

2. Description of the Related Art In recent years, development of a document reading device such as a contact type image sensor has been actively carried out. However, the present inventors have already proposed a document reading device 1 having a structure as shown in FIGS. (See Japanese Patent Application No. 6-340530).

FIG. 3 is a view showing the principle of the original reading apparatus 1, and FIG. 4 is a schematic cross-sectional view of the original reading apparatus 1.
In the document reading apparatus 1 of FIG. 3, reference numeral 2 denotes a convex lens, 3 denotes a semiconductor chip on which a large number of photoelectric conversion elements are arranged, 4 denotes a light-shielding plate, and LED chips 5 Are arranged in parallel to
The light is projected obliquely to the lower surface of the document 6 and the reflected light is focused on the semiconductor chip 3 to output image information of the document 6. Reference numeral 7 denotes a light reflecting portion provided between the LED chips 5, and reference numeral 8 denotes a light reflecting portion provided between the convex lenses 2.

In the document reading apparatus 1 having the above-described structure, the irradiation light of each LED chip 5 is projected on the document 6 while being reflected by the light reflecting portion 7 and the light reflecting portion 8, and the reflected light is transmitted through the convex lens 2 to the semiconductor device. The light is received by the chip 3.

In FIG. 4 showing a specific configuration of the original reading apparatus 1, an elongated substrate 11 is mounted on a partial surface of an elongated housing 9 made of engineering plastic such as polycarbonate, for example. The LED chip 5, the connector 12, and a processing circuit (not shown) are arranged on the surface. The LED chip 5 has a structure in which the LED chip 5 does not project light vertically to the long substrate 11 but irradiates it obliquely at a certain angle. Reference numeral 13 denotes a long transparent substrate made of glass on which a document is placed, and is fixed to the long housing 9 with an ultraviolet curing resin. Reference numeral 14 denotes a long mirror formed by evaporating aluminum on a glass plate. Reference numeral 15 denotes an electrically insulating substrate on which the semiconductor chips 3 are arranged. The lens 2 is fixed to the housing 9 by ultrasonic welding.

According to the original reading apparatus 1 having the above configuration,
The LED chip 5 irradiates the original 6 and the reflected light is on the long mirror 14 and the reflected light further irradiates the semiconductor chip 3 through the lens 2 to electrically obtain an image reading signal by photoelectric conversion. The arrows in the figure are optical paths.

[0007]

However, in the original reading apparatus 1 having the above structure, the long transparent substrate 1
3 is supported by the bridge portion of the elongated casing 9,
When a document is fed onto the long transparent substrate 13, the reading roller disposed on the long transparent substrate 13 presses, and the pressing makes the support of the long transparent substrate 13 unstable, and If used for a period, there is a problem that a shift occurs and reading accuracy is reduced.

In addition, when assembling the elongate substrate 11, it is a step of inserting it into the elongate casing 9 and then fixing it with a double-sided tape. In addition, there is also a problem that the processing circuit (electronic component chip) provided on the elongated substrate 11 is hooked on the elongated housing 9 at the time of insertion and destroyed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to firmly support a long transparent substrate for document placement so that it can sufficiently withstand the pressure of a reading roller (for example, about 0.5 to 3 kgf). It is an object of the present invention to provide a highly reliable original reading device that prevents a decrease in reading accuracy for a long period of time.

Another object of the present invention is to facilitate the assembly of a long-sized substrate on which a processing circuit is mounted, thereby increasing the assembly accuracy, thereby increasing the manufacturing efficiency and manufacturing yield, and as a result, reducing the manufacturing cost. To provide an original reading device.

[0011]

An original reading apparatus according to the present invention has a plurality of lenses arranged linearly at predetermined intervals in a long casing and one-to-one correspondence with each lens. Along with a plurality of semiconductor chips having a large number of photoelectric conversion elements arranged in a straight line, a long substrate provided with an irradiating portion provided with a light source is provided in a long housing along a longitudinal direction. The light source irradiates the original on the long transparent substrate with light, and the reflected light is reflected on the long side of the long transparent substrate. An image is formed on each photoelectric conversion element of a semiconductor chip by each lens.

According to the original reading apparatus of the present invention, apart from the elongated housing provided with the lens and the semiconductor chip, an irradiating section provided with a light source is provided, and the elongated housing and the irradiating section are provided. In this configuration, both long sides of the long transparent substrate are supported and fixed. In this configuration, the support and fixing are not performed by the bridge portion of the long housing, but are performed by bulk irradiation. The part is supported and fixed. Therefore, even if the long transparent substrate is pressed by the reading roller,
A stable support function is obtained, so that even when used for a long period of time, no deviation occurs, and accurate reading accuracy can be maintained.

Further, in the document reading apparatus according to the present invention, the elongated substrate provided with the irradiating section can be fixed by simply fitting the elongated substrate to the elongated casing with positioning pins or the like. A certain fixing can be performed, and the processing circuit (electronic component chip) provided on the long-sized substrate is not broken. As a result, the manufacturing efficiency and the manufacturing yield can be increased, and the manufacturing cost can be reduced.

[0014]

FIG. 1 shows an original reading apparatus 1 shown in FIG.
FIG. 2 is a schematic cross-sectional view of a document reading apparatus 10 constructed according to the same reading principle as that of FIG.
0 is an assembly drawing. The same parts as those of the document reading apparatus 1 of FIG.

According to FIG. 1, for example, polycarbonate containing about 30% of glass filler (other than PPS, PP)
An elongated substrate 11 is mounted on a partial surface of a black elongated housing 16 made of an engineering plastic such as E, ABS, or alloy, and the irradiation unit 17 is fixed on a main surface thereof. The irradiating section 17 includes the LED chip 5 serving as the light source, the light reflecting section 7, the light reflecting section 8, and the irradiation housing 18.

The irradiation casing 18 is made of, for example, engineering plastic such as polycarbonate, ABS, PPS, PPE, etc.
-30%, and further contains titanium oxide, which is whitened to enhance reflectivity.

Further, the long transparent substrate 13 made of glass or the like on which the original is placed is formed by setting both long sides thereof to the long housing 16.
And the irradiation housing 18 for support and fixation.

According to the document reading apparatus 10 having the above-described configuration, the light emitted from the LED chip 5 irradiates the document 6 while being reflected by the inner surface of the irradiation section 17 and the light reflection sections 7 and 8. The reflected light enters the long mirror 14 and the reflected light further passes through the lens 2 to the semiconductor chip 1.
5, and an image reading signal is obtained electrically by photoelectric conversion. The arrows in the figure are optical paths.

In manufacturing the document reading apparatus 10, the long substrate 11 and the irradiation case 18 are fixed to the long case 16 as shown in FIG.
That is, a plurality of positioning pins 19 are arranged in the elongated casing 16, and each pin 1 is placed on the elongated substrate 11.
Holes 20 are arranged at positions corresponding to 9 and can be fixed simply by fitting them together. Then, the irradiation casing 18 can be fitted and fixed on the elongated substrate 11. In this fixing means, the irradiation casing 18 is provided with a concave portion (not shown), The pin 19 is passed through the elongated substrate 11 and further fitted into the recess of the irradiation case 18. In addition, if necessary, it can be strongly fixed by applying ultrasonic waves to these fitting fixing portions.

Thus, the original reading apparatus 10 having the above configuration
According to the present invention, since the irradiation unit 17 in which the LED chip 5 is provided is provided separately from the long casing 16, the bulk irradiation unit 17 firmly supports and fixes the irradiation unit 17. However, no deviation occurs, and accurate reading accuracy can be maintained.

Further, in the original reading apparatus 10,
The elongate substrate 11 can be fixed to the elongate housing 16 only by fitting the pins 19 and the holes 20, thereby easily and accurately fixing the substrate and the processing provided on the elongate substrate 16. Does not destroy circuits (electronic component chips).

The present invention is not limited to the above-described embodiment, and various improvements and improvements may be made without departing from the spirit of the present invention. For example, in the above embodiment, the irradiating section 17 is provided with reflectivity, but instead, it may be a condensing irradiating section as already proposed by the present inventors (Japanese Patent Application No. 5-331857). reference).

[0023]

As described above, in the original reading apparatus of the present invention, the support of the long transparent substrate is not performed by the bridge portion of the long housing, but is supported by the bulk irradiation section. Since it is fixed, even when used for a long period of time, no deviation occurs, and accurate reading accuracy can be maintained. As a result, a highly reliable document reading device that prevents a decrease in reading accuracy can be provided.

In the document reading apparatus according to the present invention, the elongate substrate can be fixed simply by fitting the elongate substrate into the elongate housing, and can be easily and accurately fixed. Without destruction of the processing circuit (electronic component chip) provided therein, thereby increasing the manufacturing efficiency and the manufacturing yield and reducing the manufacturing cost. As a result, a low-cost document reading apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a document reading apparatus according to an embodiment.

FIG. 2 is a perspective view showing a method for fixing a long case, a long substrate, and an irradiation case in the document reading apparatus of the embodiment.

FIG. 3 is a diagram illustrating the principle of a document reading apparatus.

FIG. 4 is a schematic sectional view of a conventional document reading apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 10 Original reading device 2 Lens 3 Semiconductor chip 5 LED chip 9, 16 Elongated housing 11 Elongated substrate 13 Elongated transparent substrate 17 Irradiation unit 18 Irradiation housing 19 Pin 20 hole

Claims (1)

(57) [Claims] 1. A plurality of lenses arranged linearly at predetermined intervals and a large number of photoelectric conversion elements arranged linearly in a one-to-one correspondence with each lens in an elongated casing. A plurality of semiconductor chips having a plurality of semiconductor chips are arranged, and a long substrate provided with an irradiating section in which a light source is further provided is fitted in the long casing along the longitudinal direction. support to secure the long sides of the elongated transparent substrate and Jokatamitai, the original of the light source is elongated transparent substrate is irradiated with light, photoelectric conversion elements of the semiconductor chips and the reflected light by the lenses A document reading device that forms an image on the top.