JPS6319964A - Original reading device - Google Patents

Abstract

PURPOSE:To reduce mixture of noise and to attain fast reading of an original by setting a part of a signal transmission means to an original platen with another part of the transmission means at a position where said means is supported movably by a coupling means. CONSTITUTION:When an original 7 is set and an upper frame 8 is closed, a lock pin 3 moves down to the position of a slider 4. A limit switch 43 detects that an original pressing glass 9 reaches a prescribed position. Then a solenoid switch 5 works to move the slider 4 to the left and lock the frame 8. At the same time, the upper contacts 15-17 have touches with lower contacts 18-20 and all signal transmission lines are closed. A reading action of the original is started with a command received from a control panel 2. Thus it is possible to mount simply a large number of complicated signal transmission lines.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a document reading device constituting an image processing system of information equipment such as a computer input terminal, high-speed facsimile, electronic file system, and intelligent copying machine.

2. Description of the Related Art In recent years, with the spread of digital communications (vAM4), many systems having image data sources have been announced in addition to intelligent copying machines, digital facsimiles, electronic file systems, and the like. When reading a document used for such purposes, it is necessary to input a large amount of image information at high speed.

2. Description of the Related Art Document reading and scanning systems that convert image information contained in a document into electrical signals such as video signals are conventionally known.

For example, the manuscript reading device as shown in Nikkei Electronics September 10, 1984 issue, pages 161 to 194, and the Nikkei Computer 1985 issue using it,
In an image processing system such as the one shown on pages 75 to 91 of the issue of May 14th, after inputting the original in the same way as a normal copying machine, the system inputs the original and then uses a mouse or tablet while looking at a display device such as a CRT. I was doing collection work.

Problems to be Solved by the Invention However, unlike ordinary copying machines, if the input image is upside down due to a mistake in placing the original, or if the vertical and horizontal directions of the original do not match those in the memory, the following problems may occur. There were various problems in the collection process, and it was necessary to re-enter the information. In this regard, the Hunt Scanner, which enables input work while visually checking the reading surface, and Japanese Patent Laid-Open No. 58-43657
Examples include Japanese Patent Laid-Open No. 58-141075. In this case, since the reading side of the original is facing upward, the placement position of the original can be visually confirmed, and the above problem is greatly improved. ! For the document placed on the loading table,
When a unit with a movable document reading means is arranged, the signal paths for these functional parts become complex and large in number, and the distance from the signal processing circuit becomes large, causing noise to enter the weak signal transmission line from the power supply line. Due to these reasons, it was not put into practical use.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a document reading device that can hold a document with its reading surface facing upward and read images from above at high speed.

Means for Solving the Problems In order to solve the above problems, the document reading device of the present invention includes:
a document placing table on which a document is placed facing upward; a document reading means for photoelectrically converting image information of the document; and a connecting means for movably supporting the document reading means with respect to the document placing table;
It has a signal transmission means that connects the original reading means and an external device, and the signal transmission means is characterized in that a part of the signal transmission path is opened and closed by the operation of the connecting means. It has a means for fixing the operation of the connecting means in a stationary state, and is configured so that the signal transmission path is closed in this state.

According to the above-described structure, the signal transmission path is closed when the original is held stationary, and in particular, part of the signal transmission means is movably supported by the original mounting table and another part by the connecting means. By arranging it in a single section, it is possible to compactly arrange a large number of complex signal transmission paths over a short distance, and noise contamination is reduced, thereby providing a document reading device that can read documents at high speed. be.

Embodiment Hereinafter, a document reading device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic perspective view of a document reading device according to an embodiment of the present invention. In Fig. 1, 1 is the lower frame, 2 is the control panel, 3 is the lock bin, 4 is the slider, 5 is the solenoid, 6 is the original pressing plate, 7 is the original, 8 is the upper frame, 9 is the original pressing glass, and 10 is the original pressing plate. Hinge, 1) is a sensor unit, 12 is a wire for driving the sensor unit with the power of the motor, 13 is a rail for guiding the sensor unit, 14 is a motor for moving the sensor unit, 15.16.17
18. is a signal transmission contact attached to the upper frame;
19. Reference numerals 20 are signal transmission contacts attached to the lower frame, 21 is transparent position detecting means, and 22 is position indicating means.

Here, the lower frame 1 and the upper frame 8 are rotatably connected by a hinge 10 serving as a connecting means.

The original is placed between the lower frame 1 and the upper frame 8 with its reading surface facing upward, and the reading surface of the original is held flat by an original pressing glass 9 supported on the lower surface of the upper frame 8. The original reading means is the upper frame 8. Sensor unit 1). Wire 12° seam 13. It is composed of a motor 14. The coordinate input means is the position detection means 21
and a position indicating means 22. The lower frame 1 and the upper frame 8 are electrically connected at the lowest operating point of the hinge 10 through signal transmission contacts 15.16.degree. 17 and 18.19.20. The sensor unit H1 has inside it a means for illuminating the original and a means for photoelectric conversion, is supported by a rail 13 so as to be movable parallel to the original pressing glass 9, and is moved to a predetermined position by a motor 14 and a wire 12. Driven by speed. The position fixing means is composed of a lock pin 3, a slider 4, and a solenoid 5. The main operations of document reading can be instructed from the control panel 2, and all operations are controlled by the control circuit board 23 in the lower frame 1.

FIG. 2 is a schematic cross-sectional view of the sensor unit (1) of the document reading device shown in FIG. In this figure, 24 is a photoelectric conversion element, 25 is a fluorescent lamp, 26 is a 1-magnification rod lens array, 27 is an optical axis, 28 is an alumina substrate that holds the photoelectric conversion element, and 29 is a protective glass that encapsulates the photoelectric conversion element. , 30 is a frame of the sensor unit, 31 is a preamplifier for the output signal of the photoelectric conversion element, 32 is a cover for the photoelectric conversion element, 33 is a spring for adjusting the optical axis, 34 is an optical axis adjustment screw for the photoelectric conversion element, 35 36 is a spacer that regulates the height of the photoelectric conversion element; 36 is a height adjustment spring for the photoelectric conversion element;
337 is a light shielding plate. The alumina substrate 28 holding the photoelectric conversion element 24 is connected to the optical axis 27 of the rod lens array 26.
The optical axis adjustment screw 34 and spring 33 are used to correct the misalignment.
Positioning is performed by a spacer 35 and a height adjustment spring 36 against deviations in the focal direction. The fluorescent lamp 25, the loft lens array 26, the preamplifier 31, the cover 32 for the photoelectric conversion element, and the light shielding plate 37 are held in the sensor frame 30. Power is supplied to the sensor unit 1) and a read signal is outputted between the sensor unit 1) and the lower frame 1 through the transmission line 38 and the signal transmission contacts 17, 20 between the upper and lower frames.

Figure 3 shows the lock bin 3, slider 4, and solenoid 5.
Position fixing means consisting of etc., and signal transmission contacts 15.1
8 is a schematic diagram. In this figure, 39 is the lock pin 3
40 is a cant portion provided in the slider 4, 41 is an elongated hole provided in the slider 4, 42 is a bottle that passes through the elongated hole 41 and is fixed to the lower frame 1, 43 is a limit switch, 44 is lower frame 1 and slider 4
15 is an upper contact passing through the lock pin, and 18 is a lower contact disposed together with the limit switch 43. The slider 4 is the elongated hole part 4
1 is supported on the lower frame l by a bin 42,
During normal operation, the solenoid 5 moves to the right by the action of the spring 44, and to the left when the solenoid 5 is in operation. There is a cut part 40 on the top surface of the slider 4, and when the upper frame 8 is closed around the hinge 10, the lock pin 3 on the bottom surface descends to the position of this cut part 40, and when the solenoid 5 is operated, a groove is formed. 3
The cut portion 40 is fitted into the upper frame 9, and the opening/closing operation of the upper frame 8 can be fixed.

At this time, the upper contact 15 and the lower contact 18 come into contact at the same time, allowing signal transmission.

FIG. 4 is a schematic diagram of the coordinate input means. 45 is a frame for position indication, 46 is a switch for indicating point I, 47
is a pink-up coil, 48 is a transparent scale plate, 4
9 is a connection cable, 50 is a position detection pattern wiring,
51 is a transparent indication board that holds pattern wiring. The operating principle of the coordinate input means is disclosed in Japanese Patent Publication No. 37, 1985.
491. Here, the pattern wiring 50 for position detection passes inside the upper frame 8 and is driven from the lower frame 1 via signal transmission contacts 15.16.degree. 18 and 19.

FIG. 5 is a schematic sectional view of the lower frame. In this figure, reference numeral 52 denotes a document placing table that constitutes the document pressing plate 6, 53 an elastic member attached to the document placing surface, 7 a document, 54 a parallel link supporting the document placing table, and 55 a parallel link. 56 is a bin that connects the support column to the parallel link; 57 is a bottle that connects the original table and the parallel link; 58
Reference numeral 23 denotes a spring that presses the document f2 placed upward, and 23 a control circuit board that controls the entire placement. Here, the document placing table 52, the bins 56 and 57, and the spring 58 correspond to means for pressing the document against the document pressing glass. The document mounting table 52, which is supported via a parallel link 54 from a support 55 fixed to the frame 1, holds a document! ! The original 7 is moved almost vertically while keeping the loading surface horizontal, and the original 7 is moved by the pressing force of the spring 58.
It has the effect of pushing upward. Control circuit board 23
will be explained next.

FIG. 6 shows a control circuit board 2 disposed within the lower frame 1.
FIG. 3 is a prosock diagram showing the connections between 3 and other parts. However, a block diagram like the one shown in this figure can be easily designed by those skilled in the art. In this embodiment, the control circuit board 23 inputs various commands from the control panel 2, outputs messages in response to the inputs, drives the photoelectric conversion element 24 in a read operation, A/D converts the read signal, starts the motor 14, Constant speed control and return control, light intensity control when the fluorescent lamp 25 flashes and lights up, sequential driving of the pattern wiring 50 of the coordinate input means, position determination based on the detection voltage of the pink-up coil 47, and switch 46
It controls all operations of the document reading device, such as human power judgment, processing of read signals after A/D conversion in response to various editing commands, response to various commands with external equipment, and output control of read signals.

The operation will be explained below using the above drawings.

First, as shown in FIG. 1, when the upper frame 8 is opened and the original 7 is placed on the original placing section 6 and the upper frame 8 is closed, the lock pin 3 is inserted into the hole in the exterior of the lower frame 1. pass through and descend to the slider 4 position. When the limit switch 43 near the slider 4 detects that the document pressing glass 9 has reached a predetermined position, the solenoid 5
is activated, the slider 4 moves to the left, and the upper frame 8 is locked. At the same time, the upper contacts 15, 16, 17 and the lower contacts 18, 19, 20 come into contact, and all signal transmission paths are closed. With the reading surface of the original 7 in close contact with the original pressing glass 9 with a predetermined pressing force, the position can be specified by moving the position instruction frame 45 on the position detection pattern wiring 50. Further, in response to a command from the control panel 2, the document reading operation described in connection with FIG. 2 is started. At the same time as the reading is completed, the solenoid 5 is turned off and the slider 4 is moved to the right by the action of the spring 44 to release the lock pin 3. The worker is on the upper frame 8
All you have to do is open it, prepare the next document, close the upper frame 8, and give an instruction to start reading.

As described above, by arranging the signal transmission means as shown in this embodiment in such a manner that the path thereof opens and closes between the upper frame 8 and the lower frame 1, the image sensor 24 and the fluorescent light for reading the original can be 25. Sensor drive motor 14, etc. and control circuit board 2 in lower frame 1
It is now possible to simply implement a large and complex signal transmission path between the document tray and the documents placed on it. This configuration has become possible.

Note that what has been described above is one embodiment of the present invention,
The present invention is not limited to this. For example, the means for reading a document may have a structure using a photoelectric conversion element such as a COD and a reduction lens, or may use a completely contact type photoelectric conversion element without an optical system. The light source is LE
A configuration using a D array, a halogen lamp, a hot cathode tube, a cold cathode tube, or the like may be used. The means for pressing the original includes
It may be a structure using only an elastic member or a structure in which the original table is moved up and down by compressed air or hydraulic pressure.

Further, the signal transmission means may be an optical signal transmission means that combines an LED or a laser with a PIN photodiode or the like. The position fixing means is not limited to the method shown in this embodiment, such as one that stops the operation of the hinge portion or one that uses an electromagnet.

Effects of the Invention As described above, the present invention provides a document placing table on which a document is placed facing upward, a document reading means for photoelectrically converting image information of the document, and a document reading means movably supported with respect to the document placing table. and a signal transmission means for connecting the document reading means and an external device. By having a means for fixing the operation of the connecting means in a state where it is held stationary by the placing table and the connecting means, and configured so that the signal transmission path arranged to penetrate through the upper frame and the lower frame is closed in this state, the original Image sensor related to reading - 1 Fluorescent lamp, by implementing a large amount of complex signal transmission path between the sensor drive motor and the control circuit board in the lower frame in a simple and short distance, it is possible to prevent noise from entering the signal. It has become possible to perform a high-speed reading operation by reducing the amount of space required, and it has become possible to realize a configuration in which a unit having a document reading means is movably disposed on a document placing table and a document placed thereon.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a document reading device according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of a sensor unit serving as document reading means, and FIG. 3 is a part of position fixing means and signal transmission means. 4 is a schematic sectional view of the coordinate manual means, FIG. 5 is a schematic sectional view of the document pressing portion of the document reading device, and FIG. 6 is a block diagram of the document reading device. l...lower frame, 2...control panel, 3...mouth 7 pin, 6...
Original pressing plate, 7... Original, 8... Upper frame, 9... Original pressing glass, 10...
...Hinge, 1) ...Sensor unit, 15
．． 16゜17, 1B, 19.20...Contact for signal transmission, 47...Coil for pickup,
50... Pattern wiring for position detection, 52...
...Manuscript pressing plate. Name of agent Patent attorney Toshio Nakao 1 person 24゛ - Photoelectric transformation element 5 - Fluorescent lamp ah - Rod lens array 30 - Frame / WJz diagram 31 - Preamplifier q
27 3- Lock Bin 4-11 Sligh 5-°-Nnmate 15, /8 ---I Hatake No. Irami Stopped Moon A Nereta, No.
3 Figure 6

Claims (5)

[Claims] (1) a document placing table on which a document is placed facing upward; a document reading device photoelectrically converting image information of the document; and a connecting device movably supporting the document reading device with respect to the document placing table; A document reading device comprising a signal transmission device connecting the document reading device and an external device, wherein a part of the signal transmission path of the signal transmission device is opened and closed by the operation of the connection device. Device. (2) The document reading device according to claim 1, wherein the connecting device includes a document placing table and a position fixing device that fixes the operation of the document while the document is held stationary by the document placing table and the connecting device. Device. (3) Claim (2) characterized in that the signal transmission means has a position fixing means in a part of the signal transmission path.
The manuscript reading device described in Section 1. (4) The signal transmission means is configured such that all signal transmission paths are closed when the original is held stationary by the original mounting table and the connecting means.
) The document reading device described in section 2.). (5) The document reading device according to claim (1), wherein the signal transmission means includes a coupling means in a part of the signal transmission path.