JPS6360666A - Original reader - Google Patents

Abstract

PURPOSE:To detect a start tip of an original correctly by providing a frame plate onto which the start tip of the original is pushed and arranging a light reflecting body to a lower face of the frame plate. CONSTITUTION:The light reflecting body 13 shown as a reflection sheet at the lower face of the original pushing frame plate 4 and the white sheet 14 is arranged at a position corresponding to the home position of a light source. While a carriage 11 having a fluorescent light 3 exists on the home position, the reflection from the sheet 14 is read to confirm a white level. Then the carriage 11 moves to the right sequentially and detects the start tip of the original 1 and reads further the reflection of the original 1. The luminous quantity of the read reflected light 5 at the start tip of the original 1 is increased rapidly to detect the start tip of the original 1 correctly.

Description

[Detailed Description of the Invention] [Summary] In a document reading device that places a document on a transparent top plate and reads the document using reflection from the bottom surface of the transparent top plate, a document reader is used to detect the starting edge of the document. It is disclosed that a frame plate is provided against which the starting edge of the document abuts, and a light reflector is disposed on the lower surface of the frame plate, so that the starting edge of the document can be detected correctly.

[Industrial application field]

The present invention relates to a document reading device, and more particularly, to a document reading device that can correctly detect the starting edge of a document in a document reading device that places the document on a transparent top plate and reads it using two reflections.

[Problems to be solved by conventional technology and invention] For example, in an OCR image scanner called a flatbed type, a document is placed on a transparent glass top plate! 3! Place the document and cover it with the document cover from above.

A light source that moves relative to the lower surface of the top plate detects reflected light from the original that returns via the top plate.

In this case 2, for example, when reading a document in which a predetermined character entry field exists at a predetermined position on the document, the starting edge of the document is correctly detected.

It is necessary to determine the predetermined character entry field by measuring the distance from the starting end. For this.

A manuscript abutment frame plate is placed on the top plate above.

The document placed on the top plate is started to be read with its starting edge properly abutting against the document abutting frame plate.

In this case, the following problem arises. That is, when reading with the relatively moving light source, the reading position is initially at the lower surface of the document abutting frame plate.

Next, move to the beginning of the manuscript. In this case, it is desirable that the intensity of the two reflected lights can be clearly distinguished from that from the lower surface of the document abutting frame plate and that from the starting edge of the document. For this reason, it is thought that if the lower surface of the document abutting frame plate is made black, the contrast with the white document will be clear. However, it has been found that doing so is not always desirable.

FIG. 3 is an explanatory diagram illustrating this point.

Figure 3 (A) shows a state in which a document (white) placed on a transparent top plate is being read, and Figure 3 (B) shows a state in which a black sheet is present on the lower surface of the document abutting frame plate. FIG. 3(C) shows a state in which a light reflector is present on the lower surface of the document abutting frame plate.

In the figure, 1 is the document, 2 is the transparent top plate, 3 is the fluorescent light, 4 is the document abutting frame plate, 5 is the reading reflected light, 6 is the light that creates the reflected light inside the top plate, 7 is the reflection inside the top plate light.

8 represents light directed toward the reading point.

Consider a situation where an original (white) is being read as shown in FIG. 3(A). In this case, the read reflected light 5 reflected from the reading point B is superimposed with the reflected light from the light 8 and the reflected light 7 inside the top plate caused by the light 6 reflecting inside the top plate. There is. Then, with the reading reflected light 5 having the superimposed light intensity, one point B is read as white as shown on the right in Figure 2.

Considering this point, as shown in FIG. 3(B).

When a black sheet is placed on the lower surface of the document abutment frame plate 4, the situation becomes as shown in the first order. That is, when the black sheet portion is being read, the read reflected light 5 is sufficiently small and is read as black. However, when the time has come to read the starting edge of the document 1 that is abutted against the document abutting frame plate 4 (i.e., point A
).

Although there is reflection from point A based on light 8, there is virtually no reflected light 7 within the top board based on light 6.

The light intensity of the reading reflected light 5 is relatively small (Fig. 3 (A)
) compared to the case of ). As the light source moves and begins to read a point to the right of point A, the amount of reading reflected light 5 increases as shown on the right in Figure 2.
In the end, it will be judged as white. Therefore, the manuscript l
It becomes difficult to detect that the starting end of is at point A.

The white sheet portion is provided on the document abutment frame plate 4 in order to allow the apparatus to correctly remember the white level at the so-called home position of the light source.

Compared to the case of FIG. 3(B) above, if a reflector is placed in place of the black sheet part as shown in FIG. 3(C), 1
As shown on the right side of the figure, at the position of one point A, the amount of reading reflected light 5 increases rapidly, making it possible to correctly detect the starting edge of the original document l. This is because the reading reflected light 5 from the point immediately to the left of point 9 A undergoes regular reflection on the reflector.

This is because it hardly exists and suddenly increases when reading from one point A is performed.

When reading is being performed from point 9 A, the amount of light reflected within the top plate 7 can be used as the reading reflected light 5.

[Means for solving problems]

The present invention solves the above problems by disposing a reflector on the lower surface of the document abutting frame plate.

FIG. 1 shows a basic configuration diagram of the present invention, FIG. 1(A) shows a conceptual side sectional view of the main part, and FIG. 1(B) shows a conceptual bottom view of the main part. In the figure, 1 is the original, 2 is the transparent top plate, 3 is the fluorescent light, 4
1 is a document abutment frame plate, 5 is a reading reflected light, 9 is a document cover, and 10 is a reflection mirror.

1) is a carriage which allows the fluorescent lamp 3 and the reflection mirror 10 to move in the direction of arrow A in the figure; 12 represents a fixed reflection mirror. Further, on the lower surface of the document abutting frame plate 4, a light reflector 13, which is shown as a nine-reflection sheet, is arranged as shown in FIG. 1(B).

A white sheet 14 is placed at a position corresponding to the home position of the light source. Also, on the bottom surface of the top plate 2, a black sheet 1 is placed in a place where the original 1 is not supposed to exist.
4' is located. Further, a light reflector 15 is arranged on the lower surface of the document cover 9.

[Effect]

As shown in FIG. 1(A), while the carriage 1) with the fluorescent lamp 3 is at the home position, the reflection from the white sheet 14 shown in FIG. 1 is read to confirm the white level. The carriage 1) sequentially moves to the right in FIG. 1(A), detects the starting edge of the document at two points A, and thereafter operates to read the reflection from the document 1.

During this time, as explained above with reference to FIG. 3(C), the amount of reading reflected light 5 increases rapidly at the starting edge of the original 1, making it possible to correctly detect the starting edge of the original 1. . Further, by arranging a light reflector on the lower surface of the document cover 9, it becomes easy to detect the edges of the document l.

〔Example〕

FIG. 2 shows an embodiment corresponding to a cross-sectional view taken along line xx' shown in FIG. 1(B). In the figure, reference numeral 4 denotes a frame plate against which the original is abutted, 2 a transparent top plate, 13 a reflective sheet, 14 a white sheet, 16 a frame corresponding to the position against which the original is abutted, 17.18. 19 each represent an adhesive. Note that the adhesive 19 is particularly required to be a transparent adhesive.

The cross section taken along the line perpendicular to the line xx' in FIG. 1(B) also relates to the original abutting frame plate 4.

It can be considered that the structure is substantially the same as that shown in FIG. The light reflected from the white sheet 14 provides the white level at the home position. The starting edge of the original 1 is detected when the reflected light from the reflection sheet 13 becomes the reflected light at the starting edge of the original 1 as shown in FIG. 3(C).

Note that the white sheet 14 and reflective sheet 13 shown in FIG. 2 may be formed on the frame 16 directly by surface treatment of the frame 16.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to correctly detect the starting edge of a document, and one problem in reliably reading the written contents of the document is solved.

[Brief explanation of drawings]

Figure 1 is a diagram showing the principle of the present invention, Figure 2 is a diagram showing the configuration of an embodiment,
FIG. 3 shows an explanatory diagram explaining the problem. In the figure, 1 is the original, 2 is the transparent top plate, 3 is the fluorescent lamp, 4 is the original abutment frame plate, 5 is the reading reflected light, 9 is the original cover, 13 is the light reflector (reflection sheet), 14 is the own sheet (White side), 1
5 represents a light reflector (reflection sheet). Patent applicant Usatsuk Electronics Industry Co., Ltd. (1 other person) Representative patent attorney Mori 1) Hiroshi (1 other person) Hansuke stop book board (cross section) Fu2n Kousei 4Kirozu YJ3 country

Claims (3)

[Claims] (1) A document cover (9) is provided to press the document (1) placed on the transparent top plate (2) from above.
) is placed on one end side of the document abutting frame plate (4), and is placed on the transparent top plate (2) with one end abutting the document abutting frame plate (4). Manuscript (1),
The back side of the transparent top plate (2) is illuminated by a moving light source (3) that moves relatively along the transparent top plate (2).
) and reflected light (5) from the original (1) above.
In the document reading device configured to read the document, the transparent top plate (2) of the document abutting frame plate (4)
A document reading device characterized in that a light reflector (13) is disposed at least near the end of the side surface against which the document (1) is abutted. (2) The document cover (9), which presses down the document (1) placed on the transparent top plate (2) from above,
1) A document reading device according to claim 1, further comprising a light reflector (15) disposed on the surface in contact with the document reading device (1). (3) The document abutment frame plate (4) is attached to the transparent top plate (2).
) side surface, at least a part thereof is provided with a white surface (14), and the light reflector (13) is arranged.
The manuscript reading device described in Section 1.