JPS5846766A - Original reading device - Google Patents

Abstract

PURPOSE:To realize the miniaturization of a device which reads an original with a shift of an optical scanning stage, by setting the length of the scanning stage of the image pickup side larger than position and setting a driving member of the scanning stage in the margin space. CONSTITUTION:An original is irradiated by lamps 41 and 42 held in lamp housings provided at the lower part of an original board 2 of a glass plate, etc. The image of the original passes through a slit 7 and reflected by a reflector to reach a solid state image pickup element 11 via an inage forming element (lens) 10. Thus the oprical signal is converted into an electric signal. An end part (b) of the element 11, a cover 14, etc. is shifted inward by an allowable limit to the end part (a) of the lamps 41 and 42 each. Then a space S thus formed is utilized to store rails 15 and 16, scan driving wires 19 and 20, a deflecting pulley 21, etc. In such way, an original reader can be miniaturized.

Description

[Detailed Description of the Invention] In recent years, the optical image obtained on the manuscript g* is converted into an electrical signal, transmitted to a printer, and printed.
Scientific equipment ltK! j) It is developing in the direction of multi-functionality, such as document processing other than printing.

The present invention is thus suitable for an am removal device that is functionally separated and used in combination with two different document processing devices.
eh. Such a document reading device.

In order to be able to easily have a night snack with any device, it is desirable that the device be handled as small as possible.The present invention achieves the object of the present invention.

First, a specific example of the document reading device will be explained with reference to the drawings. 1
1i device main box, 2. A plate with a transparent document plate like a glass plate on its top, '55 HIRO optical scanning, 41/42 HIRO. Document illumination mounted on the front and rear support IE5 on the optical scanning table s. Lamp, 61/6 Lamp housing that also serves as a reflection chamber, 7 is a lamp housing 61/62 viewing O-slit, 8/
9 Corner reflector that reflects the image of the original illuminated by the Hiro lamp, 1
0 image forming element (lens), 11a element 100 placed on the image forming surface is an eta image element such as a CCD, which converts the received optical image into an electrical signal and transmits it. 12 Hiro element mounting base, 15 Hiro element optical path position, horizontal/straightness, etc.
N! There are 11 mechanisms.

As a precedent, three sets of #1 #A fine image element 10 and solid-state image sensor 11 are arranged horizontally (the one on the near side is omitted from the figure).

The images of one original projected on each overlap) so that they do not separate! Set it to 1. This w4 adjustment is performed based on the middle elements 10 and 11. 14 expansion element 10-11
This is a hazy cover.

The above illumination lamp 4 - member-shaped scanning platform I of the stormproof cover 14
K will be installed. The scanning table 3 is identified at the front and rear inside the main body box 1, and is connected to Ic 15 and 16 in a 91:0 relay, with a forward/reverse motor M, and an electromagnetic clutch 17. Wire tram18. wire 19
・20. Several wire direction change pulleys 21, etc.] Original mounting R
It reciprocates along the lower surface of the glass plate 112o to read the document W on the glass plate 2. 22 Hiro control panel.

Since this wi, o* manuscript reading process is already well known, detailed explanation will be omitted. There is also known an apparatus having a configuration in which the configuration shown in FIG. 1 can be reversed upside down, and is placed under a transparent glass 2 to read a large original from above.

The scope of the present invention described below also extends to this form.

Now, in order to reduce the overall volume of the ζ0@0 original document take-up device, its width in the longitudinal direction (depth) is determined by the required width of the optical scanning table 3 and the space for arranging the motor. In the longitudinal direction (scanning direction), the length required to scan the -lk name of the Hiro maximum manuscript with the slit 7, the pre-scanning length tl of b optical scanning table 3 at the scanning start point, and the optical scanning table at the scanning end point. It is determined by the trailing length t2 of 3.

In order to reduce the length in the longitudinal direction, since the length of the enlarged document remains constant, it is necessary to reduce 114htQ, that is, to reduce the shape of the optical path on the optical scanning table. Note that if the solid-state imaging device 11 is brought close to the illumination section, the heat of the lamp will distort the original image, so it is better to keep the solid-state imaging device away from the lamp.

Figure 2 shows an example in which the optical path is configured with one reflection mirror 25, and the optical path refraction point (original irradiation position P) and the solid-state photographing element 1
The distance from the imaging plane of No. 1 (optical path 11a) is Ll. And Sabashiri length 12. With a trailing length of 15L1, the relationship t1<12.

In the jgs diagram, an optical path is formed by two reflecting mirrors 8 and 9,
From the document irradiation position P (the optical path refraction point of the second reflection mirror 8), the light receiving surface of the solid-state image sensor 11, that is, the optical path end is at a distance L2 on the right side, and the optical path end of the optical path refraction point of the second reflection mirror is at a distance L3 on the left side. be. In order to keep the solid-state image sensor 11 as far away from the illumination lamp as possible, the relationship L2>L5.11>12 is established.

FIG. 4 shows an example in which the attack optical path is formed by five reflecting mirrors 24 to 26, and the relationship L2>L5.11>120 is the same as in the example shown in FIG.

Even in the configuration shown in FIGS. 2 to 4, the length tl of the optical scanning table 6 on the solid-state image sensor side is reflected from the original irradiation position P @Q
greater than its length t2, i.e. the trailing length is 111
It turns out.

The length in the scanning direction is determined as described above, but since it is necessary to illuminate the document placement glass 20 with a sufficiently uniform amount of light to the front and rear ends (execution direction), the bright lamps 41-42 are used. 11i, it is necessary to make the document device glass 2 longer (possible in the front-back direction).

On the other hand, the solid-state image sensor 11 and its attached members 12 to 14, etc.
Illumination lamps are located inside the building.

Therefore, according to the present invention, the permissible displacement of the ends bt of the solid-state image sensor 11-cover 14, etc. is retracted from the end a of the illumination lamp 41, and the rails 15, 16. Scanning drive wire 19φ20. A direction changing booth 921 and the like are arranged.

Top 1lIaO1I11! j, space for installing the above-mentioned members 15, 16, 19 to 21, etc. that drive the academic waterfall inspection table 3 are specially provided on both ends of the center line of the main body shaft 10, and i is the end of the required length of the lamp. Since the space between part a and the end of the other member is utilized, the depth dimension is small, and this type of reading device can be downsized. - If the motor M, clutch 17, and wire drum 18 are also arranged between the left and right direction change pulleys 21-21 in the space S, the motor installation space in the 1st vAVc becomes even smaller.

4 Brief explanation of the drawings' l! Figure 1 is a perspective view of the internal mechanism of the WA paper-cutting device manufactured by Hiromoto, partially cut away, and Figures 2 to 4 are layout diagrams of the optical path constituent members of the optical scanning table of the present invention. 6S Hiro optical scanning Stand, 41.4
2 Kotomei lamp, 61.6□ is lamp housing, 8-
Pa reflector, 10 elements, 11 solid-state image sensors, 2
2 is the operation panel, a is the end of the illumination lamp, #b is the end of the solid-state image sensor, S is the space between a@b, 15 and 16 are the optical scanning table guide rails, M is the drive motor, 17 is the clutch, 18 Hiro A wire drum, 19 and 20 are drive wires, and 21 is a wire direction change pulley.

Claims (1)

[Claims] (1) The document is illuminated by the illumination device, and the document image passes through a reflecting mirror that refracts the direction, and an optical scanning table that forms an optical path in which the image is formed on the solid-state image sensor by the imaging device moves, and the document is scanned. Use i for optical scanning document reading devices. A document reading device characterized in that a member for driving an optical scanning table is disposed using a space between an end in an execution direction of a document illumination lamp and the same end of a solid-state image sensor.