JPS63286062A - Picture reader - Google Patents

Abstract

PURPOSE:To read an original by any of reflected light and transmitted light by providing a light source above and below an original platen and lighting the light sources selectively. CONSTITUTION:An original scanning section 5 consisting of a 1st scanner 3 and a 2nd scanner 4 having an original platen 2 in between is provided to a main body 1. The 1st scanner 3 is provided above the platen and consists of a lighting lamp 6 lighting an original 0, a support member 7a and a carriage 7. The 2nd scanner 4 is provided under the platen and consists of a lighting lamp 21 lighting the original 0, a photoelectric transducer 22 receiving the reflected light from the original 0 or the transmitted light from the original 0, an optical system 23 leading the reflected light or the transmitted light from the original 0 to a photoelectric transducer 22 and a carriage 24 supporting the system 23.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention reads a document using, for example, reflected light or transmitted light, and outputs the read image signal to an external device such as a computer. The present invention relates to an image reading device.

(Prior Art) Recently, as the functions of personal computers and the like have improved, image reading devices for inputting various image information into computers have become commonly available.

However, existing image reading devices either read a document using reflected light or read a document using transmitted light, and there is no image reading device that can read documents arbitrarily using either method. Therefore, there is a need for a device that can arbitrarily read a document using either reflected light or transmitted light.

The one above that uses reflected light is a normal black and white original,
Transmitted light is used for originals with positive images or negative images drawn on transparent film or OHP paper.

If you try to read the positive image of the transparent film mentioned above using reflected light, the resolution will drop because fine lines, etc. will become blurred or blurred due to diffusion by the document cover surface (white surface), that is, the light will go around. Therefore, reading is performed using transmitted light.

(Problems to be Solved by the Invention) As mentioned above, there is a demand for a device that can arbitrarily read a document using either reflected light or transmitted light. It is an object of the present invention to provide an image reading device that can read an image as desired and can read a document without wrinkles or warping in either reading.

[Structure of the Invention (Means for Solving Problems)] The image reading device of the present invention reads image information of a document placed on a document tray, and reads the image information of the document from above the document tray. a first light source that irradiates light to the original; a second light source that irradiates light to the original from the lower part of the original placing table; transmitted light from the first light source transmitted through the original; a photoelectric conversion unit that receives reflected light from a second light source and converts it into an electrical signal; a first moving unit that moves the first light source along the document mounting table; a second moving means for moving the second light source and the photoelectric conversion means along the document mounting table; a specifying means for specifying whether the document is for reflected light or transmitted light; and according to the specification of the specifying means. When the document is for transmitted light, the first light source is turned on, and the first light source is turned on, and the first light source is turned on.
A second moving means controls the movement of the first light source and the photoelectric conversion means along the document mounting table, and when the document is for reflected light, the second light source is turned on and the second light source is turned on. control means for controlling the movement of the second light source and the photoelectric conversion means along the document mounting table by means of a movement means;
and a pressing member that is provided on the first moving means and presses the original as the first moving means moves.

(Function) This invention reads a document using transmitted light by lighting up a first light source provided at the top of the document placement table, or reads the document using transmitted light. By turning on the light, you can selectively read the original using reflected light, allowing you to read the original using either reflected light or transmitted light. When the placed original is a transmission original, a suppression member provided on the first moving means for moving the first light source presses the original against the original placing table, thereby preventing wrinkles or warping of the original. It is designed so that it can be read even when there is no .

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 3 show an image reading device of the present invention that reads a reflected light original (ordinary original) or a transmitted light original (positive, negative film, OHP paper), and an external device such as a computer. This figure shows a scanner that outputs the read image signals. That is, 1 is a scanner main body, and an operation panel 61 is provided at the front of the upper surface of this main body 1. A document placement table (platen glass) 2 made of transparent glass is fixed to the upper surface of the main body 1.

The main body 1 is provided with a document scanning section 5 that includes a first scanner 3 and a second scanner 4, which are provided with a document placement table 2 in between. The first scanner 3 is provided above the document placing table 2, and by reciprocating along its upper surface in the direction of arrow a in the figure, the first scanner 3 optically scans the document 0 set on the document placing table 2. It scans the
Illumination lamp (first light source; fluorescent lamp) 6 that illuminates the original O
, a support member 7a that supports the illumination lamp 6, and a carriage 7 connected to the support member 7a through an opening 64.

As shown in FIG. 3, the carriage 7 and the support member 7a are guided by a guide rail 8 and a guide shaft 9 so as to be able to reciprocate in the direction of arrow a.

A driving pulley 11 driven by a scanning motor (for example, a pulse motor) 10 capable of forward and reverse rotation is disposed at one end of the guide shaft 9, and a driven pulley 12 is disposed at the other end. A timing belt 13 is stretched between 11 and 12. One point of the timing belt 13 is fixed to the carriage 7 via a fixing member (not shown). This allows the carriage 7 to move linearly by rotating the scanning motor 18 in the forward or reverse direction. The support member 7a is
It is possible to move on the document table 2 via a transparent plate 60 (described later) (without bumping into each other).

Moreover, rollers 70, 70, 70 as suppressing members are rotatably provided on the support member 7a. When reading the original O for transmitted light, the roller 70 presses the original O and moves as the supporting member 7a moves, that is, it moves while smoothing out the wrinkles and warpage φ of the original O. .

Further, the document 0 for transmitted light is held and positioned at one end by a document holding member 71 on the document table 2 .

Further, the second scanner 4 is provided below the document placing table 2, and moves back and forth in the direction of arrow a in the figure along the lower surface of the second scanner 4, thereby scanning the document O set on the document placing table 2. It scans optically, and includes an illumination lamp (second light source; fluorescent lamp) 21 that illuminates the original O, and a photoelectric converter (photoelectric conversion means) that receives reflected light from the original O or transmitted light from the original O. ) 22, optical system (light focusing lens) that guides reflected light or transmitted light from the original O to the photoelectric converter 22
23, and a carriage 24 that supports them.

The photoelectric converter 22 outputs an image of the original O as an electrical signal by photoelectrically converting reflected light or transmitted light from the original O, and is mainly composed of, for example, a CCDCD pillar image sensor.

As shown in FIG. 3, the carriage 24 is guided by a guide rail 25 and a guide shaft 26 so as to be able to reciprocate in the direction of arrow a. A scanning motor (for example, a pulse motor) 27 is provided at one end of the guide shaft 26 and is capable of forward and reverse rotation.
A drive pulley 28 is driven by a drive pulley 28, and a driven pulley 29 is disposed at the other end of the drive pulley 28.
A timing belt 30 is stretched between 8° and 29°. One point of the timing belt 30 is fixed to the carriage 24 via a fixing member 31.

This allows the carriage 24 to move linearly by rotating the scanning motor 27 in the forward or reverse direction.

Further, a scale 41 serving as a reference surface on which the original O is placed, a transmission reference plate 42, and a reflection reference plate 43 are provided on the upper surface of the end portion of the document mounting table 2.

The transmission reference plate 42 is provided on the document table 2 and is made of a thick material. This prevents dust from adhering to the optical focus surface Q, and even if dust were to adhere to the upper surface P of the transmission reference plate 42, since it is not the optical focus surface, it would have a negative effect on the transmission reference data. There is no such thing.

Therefore, since a dedicated thick transmission reference plate is provided on the upper end of the document table 2, it is possible to prevent the transmitted light document from entering the transmission reference data reading area.
Even if dust adheres to the transmission reference plate, the transmission reference data can be stably read because it is not an optical focus surface.

Furthermore, a document cover 62 is provided at the top of the main body 1 and can be opened and closed by a hinge (not shown).

A white reflective plate (or reflective paper) 63 is provided as a white cover for reflection on the side of the document mounting table 2 of this document cover 60, and a white reflective plate (or reflective paper) 63 is provided as a white cover for reflection. In some cases, it is used closed to remove wrinkles, warps, etc.

When the document O is for transmitted light, the document cover 62 is provided with a second cover.
As shown in the figure, it is open so that the first transmission scanner 3, that is, the support member 7a, can pass over the document table 2 without colliding with it.

FIG. 4 schematically shows the overall control system.

That is, the CPU 51 as a control unit that controls the entire system includes an operation panel 52, a standardization circuit 53, a memory 54, a light source control unit 55, 56, a motor drive unit 57, 58, and a
/D converter 59, respectively.

The operation panel 52 instructs to start reading a document,
It consists of keys for specifying (selecting) whether the document to be read is to be read by reflected light or by transmitted light. The standardization circuit 53 performs standardization (shading correction, that is, the photoelectric converter 22
(variation correction). The memory 54
stores reflection reference data obtained by A/D converting the light reflected by the reflection reference plate 43 or transmission reference data obtained by A/D converting the light transmitted by the transmission reference plate 42.

The light source control section 55 is connected to the illumination lamp 6,
Its lighting control and light amount control are performed.

The light source control section 56 is connected to the illumination lamp 21 and controls its lighting and light amount.

The motor drive unit 57 is connected to the scanning motor 1° and drives it. The motor drive section 58 is connected to the scanning motor 27 and drives it. The A/D converter 59 is connected to the photoelectric converter 22, converts an electric signal from the photoelectric converter 22 into a digital signal, and outputs the digital signal to the CPU 51.

Next, the operation in the above configuration will be explained. For example, now, using the operation panel 52, the user selects whether document 0 is for reflected light or transmitted light, places document 0 on document table 2, and presses a reading start key (not shown). In this case, if the document 0 is for reflective use, the document cover 62 is closed and processed, and if the document O is for transmitted light, the document cover 62 is left open and one end of the document O is held down by the document holding member 71. In this state, the document is placed on the document table 2 and processed.

Then, if the reflection mode is selected, the CPU 51 turns on the illumination lamp 21 and turns on the scanning motor 2.
7, the carriage 24 is moved. Thereby, the light from the illumination lamp 21 is irradiated onto the reflective reference plate 43 and the original O via the original placing table 2. These reflective reference plates 43 and original O (or reflective plate 6
3) The reflected light from the photoelectric converter 22 passes through the optical system 23.
guided by. This photoelectric converter 22 converts the light into an electrical signal and sends it to the A/D converter 59.

A/D converter 59 converts this analog signal into a digital signal.

The signal from the reflection reference plate 43 from the A/D converter 59 is stored in the memory 54 as reflection reference data. The signal from the original O from the A/D converter 59 is standardized by the standardization circuit 53 using the reflection reference data stored in the memory 54, and output as read data to an external device (not shown). be done.

Further, when the transparent mode is selected, the CPU 51
While lighting the illumination lamp 6, the scanning motor 10.
27, the carriage 7 (support member 7a
), the carriage 24 is moved synchronously. At this time, the illumination lamp 6 and the photoelectric converter 22 move synchronously. Thereby, the light from the illumination lamp 6 is irradiated onto the transmission reference plate 42 and the original O. The light transmitted through the transmission reference plate 42 and the original O is guided to the photoelectric converter 22 via the original mounting table 2 and the optical system 23. This photoelectric converter 22
converts the light into an electrical signal and sends it to the A/D converter 59. Five A/D converters convert this analog signal into a digital signal.

When the supporting member 7a moves, the rollers 70, 70 move while pressing the original 0, that is, they move while smoothing out the wrinkles and warpage of the original 0.

The signal from the A/D converter 59 by the transmission reference plate 42 is stored in the memory 54 as transmission reference data. The signal from the original O from the A/D converter 59 is standardized by the standardization circuit 53 using the transmission reference data stored in the memory 54, and output as read data to an external device (not shown). be done.

As described above, depending on the type of document placed on the document table, it is possible to read either reflected light or transmitted light from the document.

In addition, in the case of scanning a reflective document, it is suppressed by the document cover so that it can be read without wrinkles or warping, and in the case of scanning a transmitted light document, it is pressed by the illumination lamp 6, that is, a roller that moves together with the support member. and can be read without wrinkles or warping.

[Effects of the Invention] As detailed above, according to the present invention, a document can be arbitrarily read using either reflected light or transmitted light.
Furthermore, it is possible to provide an image reading device that can read a document without wrinkles or warping in either case.

[Brief explanation of the drawing]

1 to 4 are for explaining one embodiment of the present invention, and FIG. 1 is a side view schematically showing the main parts of the configuration;
Fig. 2 is an external view showing the overall configuration, Fig. 3 is a perspective view showing the scanner moving mechanism of the document scanning section, and Fig. 4 is a block diagram schematically showing the overall control system.゛ru. 2... Operation panel, 3... First scanner, 4...
Second scanner, 5... Original scanning unit, 6.21... Illumination lamp, 10.27... Scanning motor, 22...
Photoelectric converter, 51...CPU, 52...Operation panel, 62...Document cover, 63...Reflector, 70...
-Roller (pressing member), 71...Document holding member. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (2)

[Claims] (1) In an image reading device that reads image information of a document placed on a document placing table, a first light source that irradiates light onto the document from the upper part of the document placing table; and a lower part of the document placing table. a second light source that irradiates light onto the original, and transmitted light that is the light from the first light source transmitted through the original, or reflected light that is the light from the second light source that is reflected on the original. a photoelectric conversion means for receiving light and converting it into an electrical signal; a first moving means for moving the first light source along the document mounting table; and a first moving means for moving the first light source along the document mounting table; a second moving means for moving the document along the mounting table; a designation means for designating whether the document is for reflected light or for transmitted light; and according to the designation of the designation means, if the document is for transmitted light;
The first light source is turned on, and the first and second moving means control the movement of the first light source and the photoelectric conversion means along the document mounting table, when the document is for reflected light. , a control means for turning on the second light source and controlling the movement of the second light source and the photoelectric conversion means along the document mounting table by the second moving means; and the first moving means. 1. An image reading device comprising: a pressing member that is provided on a pressing member and presses the original as the pressing member moves. (2) The image reading device according to claim 1, wherein the document placed on the document table has at least one side held on the document table.