JPH0772557A - Platen device for picture reader and its controlling method - Google Patents

Abstract

PURPOSE:To provide a platen device for a picture reader having a display function for performing appropriate display in accordance with an original size with good visibility. CONSTITUTION:One transference electrode 2a is constituted of an electrode 7 for the width direction of B6, an additional electrode 8 for the width direction of A5, an additional electrode 9 for the width direction of B5, an additional electrode 10 for the width direction of A4, an additional electrode 11 for the width direction of B4 and an additional electrode 12 for the width direction of A3; and the other transference electrode 2b is constituted of an electrode 13 for the length direction of B6, an additional electrode 14 for the length direction of A5, an additional electrode 15 for the length direction of B5, an additional electrode 16 for the length direction of A4, and the additional electrode 17 for the width direction of A3. In the case of inputting an original widthwise, the potential of the electrode 2b is wholly set to zero and voltage is selectively impressed on the electrode 2a in accordance with the original size. In the case of inputting the original lengthwise, the potential of the electrode 2a is wholly set to zero and the voltage is selectively impressed on the electrode 2b in accordance with the original size, whereby the display with good visibility is realized in accordance with the original size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a platen device used in an image reading device such as a copying machine or an image scanner, and more particularly to improvement of a platen device having a display function of a document size and a reading direction.

[0002]

2. Description of the Related Art Conventionally, as this type of platen device,
For example, as disclosed in Japanese Patent Laid-Open No. 2-16861, there is known a structure in which a platen glass on which a document is placed is provided above an image sensor and a platen cover which covers the document and the entire platen glass is provided. It is well known. In such a structure, the document placement position is generally displayed by marking the periphery of the platen glass with a mark for each paper size by means such as printing. Then, the user selects the mark of the placement position for the size of the document to be scanned from the marks displayed on the peripheral portion of the platen glass, and the document is placed at the position indicated by the mark. It was designed so that the image could be read by placing the. In this way, the user himself / herself selects a mark corresponding to his or her own document size from among the plurality of marks indicating the document placement displayed for each document size, and places the document at a predetermined position. Such a structure has a drawback that the user often misreads the mark and the operability is poor.

Therefore, in order to further improve the operability when placing a document, in recent years, a transmissive liquid crystal panel is provided in place of the platen glass, and a portion of the transmissive liquid crystal panel on which the document is placed is transparent. Various controls have been proposed in which the user can immediately recognize the document placement position by controlling the other portions to be opaque (see, for example, Japanese Patent Publication No. 55-6227). ).

[0004]

In such an apparatus, for example, when the liquid crystal is sandwiched between two transparent electrodes, a transparent electrode is provided for displaying the mounting position and the original size according to the original size. How to divide is an important issue from the configuration of the entire device, the price, etc. For example,
The configuration disclosed in Japanese Examined Patent Publication No. 55-6227 has a drawback in that the divided shape of the electrodes is too simple, so that display corresponding to a desired document size cannot be performed.

As one of the methods of dividing the transparent electrode, as a relatively simple and simple method, for example, two transparent electrodes are each composed of a plurality of strip-shaped electrodes, and
It is conceivable that the directions of division of the two transparent electrodes are orthogonal to each other so that the two transparent electrodes have a so-called matrix shape when viewed in a superposed manner.
In such an electrode configuration, a voltage is selectively applied to the strip-shaped electrodes to make the liquid crystal positioned between the strip-shaped electrodes facing each other in a cross shape transparent. However, in this case, since the voltage is applied to the portion of the electrode other than the portions facing each other between the upper and lower strip electrodes, the liquid crystal located in this portion is not completely opaque and is in a semitransparent state. There is a problem that a so-called crosstalk phenomenon occurs and accurate display cannot be performed.

In order to avoid this crosstalk, for example, the present applicant has come up with a division of a transparent electrode as shown in FIG. That is, first, as the basic configuration of division, both the two transparent electrodes are suitable for both the case where the document is placed horizontally and the case where the document is placed vertically as shown in FIG. 8A. Thus, divided electrodes corresponding to a plurality of original sizes are provided. For example, when the liquid crystal in the portion to which the voltage is applied is in a transparent state and the B6 size original is placed vertically, a predetermined voltage is applied to the divided electrodes D, E, and F. The region occupied by these divided electrodes D, E, F, that is, the liquid crystal portion corresponding to just B6 size is made transparent. However, the configuration shown in FIG. 8A is merely a principle, and in reality, wiring is required to apply a voltage to the divided electrodes located in the shaded portion of FIG. The configuration is as shown in FIG. For example, the divided electrode G shown in FIG. 8A corresponds to the divided electrode H in FIG. 8B. The divided electrode H has the wiring portion 24 formed,
This wiring portion 24 is located on one short side of the transparent electrode (see FIG. 8).
It is extended toward the left side of the paper in (b). However, in this way, the wiring portion 24 is divided into the divided electrodes D.
Since the transparent electrode is disposed toward the peripheral portion of the transparent electrode through between the divided electrode E and the divided electrode E, a voltage of B6 size is applied to the divided electrodes D, E, and F as in the previous example. If you want to display, in the area of B6 size
There is an inconvenience that the liquid crystal part corresponding to 4 becomes opaque.

Therefore, even when any of the above-mentioned transparent electrodes is used, there is a problem that it is not possible to obtain a display state which is appropriate and excellent in visibility according to the size of the original.

The present invention has been made in view of the above circumstances, and provides a platen device of an image reading apparatus that is accurate and excellent in visibility according to the size of a document.

[0009]

According to another aspect of the present invention, there is provided a platen device for an image reading apparatus having a display layer sandwiched between two transparent electrodes, the display layer being adapted to the size of a document. In the platen device of the image reading apparatus, which displays the placement position and size of the document by setting the display state, one of the two transparent electrodes can be combined with various document sizes and the document can be turned sideways. A plurality of horizontal electrodes for inputting into the document, and the other of the two transparent electrodes is a combination of a plurality of vertical electrodes for inputting a document in a portrait orientation and adapted to various document sizes depending on the combination. is there.

According to another aspect of the present invention, there is provided a platen device for an image reading apparatus, which has a display layer sandwiched by two transparent electrodes, and sets the display layer in a display state according to the size of the original. In a platen device of an image reading apparatus configured to display a placement position and size of a document, one of the two transparent electrodes is adapted to various document sizes by a combination, and a plurality of documents for laterally inputting the document are provided. Of the horizontal electrodes, the other of the two transparent electrodes is composed of a plurality of vertical electrodes for adapting to various original sizes in combination and for inputting the original vertically, and
Read setting means for setting the paper size and input direction of the read document, and an electrode for applying a voltage from a plurality of electrodes constituting the two transparent electrodes according to the data set by the read setting means. And an applied voltage control means for generating a necessary voltage according to the data set by the reading setting means and applying a voltage to the electrode selected by the electrode selecting means. It will be done. In particular, the applied voltage control means, when the portrait setting of the original is set by the read setting means, one transparent electrode having a plurality of horizontal electrodes has a zero potential and the other transparent electrode has a read potential. It is preferable to output a voltage corresponding to the document size set by the setting means.

According to a fourth aspect of the present invention, there is provided a method of controlling a platen device of an image reading apparatus, which has a display layer sandwiched by two transparent electrodes, and displays the display layer depending on a size of a document. The platen device of the image reading device is configured to display the placement position and size of the document by combining one of the two transparent electrodes to suit various document sizes and to cause the document to face sideways. An image reading apparatus including a plurality of horizontal electrodes for inputting, and the other of the two transparent electrodes adapted to various original sizes by a combination and including a plurality of vertical electrodes for vertically inputting an original. In the control method of the platen device of
When reading an original in the horizontal direction, all the vertical electrodes forming the other transparent electrode are set to the same potential, and the size of the original to be read is set with respect to the plurality of horizontal electrodes forming the one transparent electrode. Accordingly, when a voltage is selectively applied to read an original in a portrait orientation, all the horizontal electrodes forming the one transparent electrode are set to an equal potential, and a plurality of transparent electrodes forming the other transparent electrode are formed. By selectively applying a voltage to the vertical electrodes according to the size of the document to be read, all or part of the display layer is brought into a display state according to the size of the document and the input direction.

[0012]

In the platen device of the image reading apparatus according to the first aspect of the present invention, one of the two transparent electrodes reads a document in a horizontal direction, so that all or part of the display layer is in a horizontal display state. It consists of a plurality of horizontal electrodes required, and the other one consists of a plurality of vertical electrodes necessary to make all or part of the display layer vertically transparent because the original is read vertically. Since one transparent electrode is not composed of an electrode for inputting a document in a horizontal direction and an electrode for inputting a document in a vertical direction, the configuration is simplified as compared with the conventional one, and therefore the size of the document is reduced. It is possible to display accurately according to.

In the platen device of the image reading apparatus according to the second aspect of the present invention, when the reading setting means inputs the size of the original and the input direction indicating whether the original is the horizontal orientation or the vertical orientation, the applied voltage control means performs the operation. A plurality of horizontal electrodes that generate two voltages to be applied to the two transparent electrodes in accordance with the setting data in the reading setting means, while the electrode selecting means configures two transparent electrodes in accordance with the setting data in the reading setting means. An electrode to which a voltage is applied is selected from the electrode and the vertical electrode, and the voltage generated by the application control unit is applied to the selected electrode, so that the display layer is changed according to the size of the original and the input direction. It is in a display state.

In the method of controlling the platen device of the image reading apparatus according to the fourth aspect of the present invention, either one of the two transparent electrodes depending on the desired input direction of the original, the vertical or horizontal direction forming the transparent electrode. All of the electrodes for use are set to an equal potential, for example, zero potential, while a voltage is selectively applied to the vertical or horizontal electrodes forming the other transparent electrode according to the size of the original, so that the display layer is different from the conventional one. A desired part of the display layer can be made transparent and opaque without producing a part that becomes a semi-transparent state, and the operation of applying a voltage to the transparent electrode is simpler than before. It will be done.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the platen device of the image reading apparatus according to the present invention will be described below with reference to FIGS. Here, FIG. 1 is a plan view showing the structure of two transparent electrodes in the first embodiment of the platen device of the image reading device according to the present invention, and FIG. 2 is a schematic configuration of the platen device of the image reading device according to the present invention. FIG. 3 is a vertical cross-sectional view showing a configuration example of a controller for controlling the platen device of the image reading apparatus according to the present invention. FIG. 4 is a first platen apparatus of the image reading apparatus according to the present invention. It is a top view which shows the operation example in an Example. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

First, a schematic structure of the present apparatus will be described with reference to FIG. 2. The present apparatus is made of, for example, a transparent member such as glass and is formed into a flat plate-like transparent protective plate 1a.
b are opposed to each other, and transparent electrodes 2a and
2b is formed, and a display layer 3 made of liquid crystal or the like is provided between the transparent electrodes 2a and 2b, and an original 4 is placed on one transparent protective plate 1a as described later. It is like this. The display layer 3 in the present embodiment is
A portion to which a voltage is applied changes to a transparent state, and a portion to which a voltage is not applied changes to an opaque state.
A liquid crystal / polymer composite material is suitable as a member forming the display layer 3. Specifically, for example, NCAP (Nema
tic Curvlinear Aligned Phase), PDLC (Polymer
Dispersed Liquid Crystal, PNLC (Polymer Netw)
ork Liquid Crystal) is known by the name.

1A and 1B show the planar shapes of the two transparent electrodes 2a and 2b, the structure of which will be described below with reference to the same figure. First, one transparent electrode 2a will be described with reference to FIG. 1A. FIG. 1A shows an electrode structure when one transparent electrode 2a is viewed from above one transparent protective plate 1a. Electrode for laying the long sides of A and B size sheets, which are generally known to indicate the sheet size, along the lateral direction (left and right direction of the paper surface in FIG. 1A). It has a layout structure. That is, in FIG. 1A, one transparent electrode 2a is a plurality of horizontal electrodes, that is, a B6 horizontal electrode 7, an A5 horizontal additional electrode 8, and a B5 horizontal additional electrode 9.
A4 horizontal additional electrode 10, B4 horizontal additional electrode 11, A
It has three horizontal additional electrodes 12, and is formed in the size of approximately A3 size paper as a whole.

The size of the B6 lateral electrode 7 itself is
This corresponds to the size of so-called B6 size paper. The A5 horizontal additional electrode 8 has a so-called hook shape (a shape similar to the shape obtained when the L-shape is inverted to the left with its long side as the center and further rotated 90 degrees counterclockwise as a whole. The long side portion 8a is formed on one long side of the B6 horizontal electrode 7 and the short side portion 8b is formed on the B6 horizontal electrode 7 with a slight gap therebetween. The horizontal electrodes 7 are arranged substantially parallel to the short sides of the horizontal electrodes 7. The A5 horizontal additional electrode 8 and the B6 horizontal electrode 7 correspond to the size of A5 size paper. Similar to the arrangement of the A5 horizontal additional electrode 8 described above, the B5 horizontal additional electrode 9 is arranged outside the A5 horizontal additional electrode 8 with a slight gap. The combined size of the B6 horizontal electrode 7 and the A5 horizontal additional electrode 8 corresponds to the size of a B5 size paper. Hereinafter, the A4 horizontal additional electrode 10, the B4 horizontal additional electrode 11, and the A3 horizontal additional electrode 12
Since the arrangement and the size of the same are the same, the individual description will be omitted.

Further, one end portion of each of the electrodes 7 to 12 in the longitudinal axis direction, that is, in this embodiment, as shown in FIG.
The wirings Y1 to Y6 are led out from the left end portions of the electrodes 7 to 12. Next, the other transparent electrode 2b will be described with reference to FIG. The other transparent electrode 2b has a structure for vertically placing the original paper (refers to a case where the longitudinal axis direction of the paper is placed along the vertical direction of the paper in FIG. 1B). Electrodes, namely, B6 vertical electrode 13, A5 vertical additional electrode 14, B5 vertical additional electrode 15, A4 vertical additional electrode 16 and A3 horizontal additional electrode 17.
And has.

B6 vertical electrode 13, A5 vertical additional electrode 1
The shapes and sizes of the 4, B5 vertical additional electrodes 15 and the A4 vertical additional electrodes 16 are the same as the previous B6 horizontal electrodes 7, A5, respectively.
It is the same as the horizontal additional electrode 8, the B5 horizontal additional electrode 9, and the A4 horizontal additional electrode 10, but the arrangement is different from that of the one transparent electrode 2a shown in FIG. 1 (a). is there. That is, the B6 horizontal electrode 7 is vertically arranged so as to occupy the left corner of the other transparent electrode 2b, and the A5 vertical additional electrode 14, the B5 vertical additional electrode 15, and the A4 vertical additional electrode 16 are respectively arranged. B with a slight gap between each other
6 From the upper side to the right side of the vertical electrode 13 (B in FIG. 1B)
6 upper side and right side of the vertical electrode 13), the long side portions 14a, 15a of the additional electrodes 14, 15, 16
16a is on the right side of the B6 vertical electrode 13 and each additional electrode 1
The short side portions 14b, 15b, 16b of 4, 15, 16 are B
The six vertical electrodes 13 are arranged in parallel with each other on the upper side. Further, the A3 horizontal additional electrode 17 is formed so as to have a size corresponding to just the size of A4 size paper, and the long side thereof is the long side portion 16a of the A4 vertical additional electrode 16. A parallel to
It is arranged on the right side of the four vertical additional electrodes 16 with a slight gap.

The combined size of the B6 vertical electrode 13 and the A5 vertical additional electrode 14 is just A5 size, and
The total size of the 6 vertical electrodes 13, the A5 vertical additional electrode 14 and the B5 vertical additional electrode 15 is just B5 size, and B6
The total size of the vertical electrode 13, the A5 vertical additional electrode 14, the B5 vertical additional electrode 15, and the A4 vertical additional electrode 16 is just A4 size, and the B6 vertical electrode 13, the A5 vertical additional electrode 14, B5 The combined size of the vertical additional electrode 15, the A4 vertical additional electrode 16 and the A3 horizontal additional electrode 17 corresponds to exactly the A3 size, respectively. And
The wirings X1 to X5 are drawn out from the lower side of each of the electrodes 16 to 17 (the lower side of the paper surface in FIG. 1B).

Next, the display operation of the display device of this apparatus will be described. First, FIG. 3 shows an example of the configuration of a control unit for controlling the present apparatus. The content of the control unit will be described with reference to FIG. 18a, an electrode selection unit 18b as an electrode selection unit, and an applied voltage control unit 18c as an applied voltage control unit. Operation part 1
The reference numeral 8a is used by the user to input the size of a document desired to be read and the input direction (information indicating whether the document is placed vertically or horizontally).
Is provided so that these data can be input. The electrode selection unit 18b selects wirings (X1 to X5 and Y1 to Y6) to which a voltage should be applied, based on the document size and the input direction input to the operation unit 18a.
The applied voltage control unit 18c generates a voltage to be applied to the wiring selected by the electrode selection unit 18b based on the information about the document size and the input direction input from the operation unit 18a, and the generated voltage via the electrode selection unit 18b. A voltage is applied to the electrodes.

In such a structure, for example, when a document of A5 size is to be read horizontally, first, a start switch (not shown) is turned on, and subsequently, the document size is B6 from the operation unit 18a and Key in that the input is horizontal. Here, as the input of the document input direction, a code for vertical and horizontal placement is set in advance, and this code (for example, "1" for vertical placement, and for horizontal placement) It is like "2".)
The input direction can be set by inputting. In response to this key input, all the zero potentials are connected to the wirings Y1 to Y6 connected to one transparent electrode 2a and the other transparent electrode 2b is connected to the other transparent electrode 2b by the electrode selector 18b and the applied voltage controller 18c. Of the wirings X1 to X5, the wiring X1
, And X2, and the voltage V is applied to the wirings X3 to X5 at zero potential. As a result, in the entire area of the display layer 3, as shown in FIG. 4, the shaded area B is in the non-transmissive state (white turbid state), while the remaining area B is just the size of A5. It becomes a transparent state with a corresponding size. Therefore, the user can read the original by placing an A5-size original (not shown) in the transparent area B and pressing the read start switch (not shown).

Next, the second embodiment will be described with reference to FIGS.
Will be described below with reference to. In the second embodiment, the original is placed on the basis of the corners of the platen device in the first embodiment, whereas the center of one side of the platen device in the lateral axis direction is set. It is configured to be placed around. That is, one transparent electrode 2c is
It has an arrangement structure for placing a document horizontally, and includes a horizontal reference electrode 19 and ten horizontal additional electrodes 20a to 20j (see FIG. 5). The horizontal reference electrode 19 is
For example, it has a size corresponding to B6 size, and is arranged such that its longitudinal axis direction is along the lateral direction (the left-right direction on the paper surface in FIG. 5). In addition, the horizontal additional electrodes 20a to 20
j has a substantially U-shaped planar shape, and has three sides (two long sides and one short side) of the horizontal reference electrode 19 so that the horizontal reference electrode 19 is located inside the U-shape. It is arranged around one hand side). Then, one short side of the transparent electrode 2c (the left side of the paper in FIG. 5)
In, the electrodes 19 and 2 which constitute the transparent electrode 2c
Wirings y1 to y11 are drawn out from 0a to 20j.

The other transparent electrode 2d has an arrangement structure for vertically placing a document, and the vertical reference electrode 21 is provided.
And six vertical electrodes 22a to 22f and ten strip electrodes 23a to 23j (see FIG. 6). The vertical reference electrode 21 has a size corresponding to, for example, the B6 size, and is arranged such that its long side is along the short side of the transparent electrode 2d, similarly to the horizontal reference electrode 19 described above. Further, the vertical additional electrodes 22a to 22f are formed in a substantially U-shape in a plan view, and the vertical reference electrode 21 has three positions so that the vertical reference electrode 21 is located inside thereof.
It is arranged around the sides (two short sides and one long side). Further, the length of the longitudinal axis of the strip-shaped electrodes 23a to 23j is the size of a document that allows the image reading at the vertical position on the transparent electrode 2d, that is, the vertical reference electrode 2
1 and the lengthwise additional electrodes 22a to 22f are set to be equal to the length of the short axis of the document size (for example, B3 size), and are arranged side by side on the right side of the lengthwise additional electrode 22f. Then, the electrodes 21, 22a to 2a-2 from one short side of the transparent electrode 2d (the side on the left side of the paper surface in FIG. 6).
Wirings x1 to x7 connected to 2f and wirings x8 to x17 are drawn out from one short side of the strip-shaped electrodes 23a to 23f (lower side in FIG. 6).

The operation of the apparatus having the above-mentioned structure will be described by taking as an example the case where an A5 size original is placed horizontally and enlarged and copied.
All 17 are grounded, and the other transparent electrode 2b is set to a zero potential state. In addition, in one transparent electrode 2c, the display layer 3
Is applied to the horizontal reference electrode 19 and the horizontal additional electrode 20a via the wirings y1 and y2, and to the horizontal additional electrodes 20b to 20d via the wirings y3 to y5. Vs <V) is applied to the horizontal additional electrodes 20e to 20f via the wirings y6 to y11, respectively, with a zero potential. Here, the voltage Vs is sufficient to bring the display layer 3 into the semi-transmissive state. By setting the voltage like this,
As shown in FIG. 7, in the display layer 3, a white area C (e.g., corresponding to A5 size) corresponding to a combined portion of the horizontal reference electrode 19 and the horizontal additional electrode 20a is in a transmissive state. On the other hand, the horizontal additional electrodes 20b to 20d of the display layer 3
Area E (area hatched from upper right to lower left in FIG. 7) is in a semi-transmissive state, and further to the area corresponding to the horizontal additional electrodes 20e to 20j of the display layer 3 (in FIG. 7). The shaded area from the upper left to the upper right of the paper) is opaque. In such an operation state, it is suitable to use the position where the area C in the transparent state places the original as the size of the original after the area E in the semi-transparent state is enlarged. That is, it is suitable as a display when an A5 size original is enlarged and copied to a B4 size.

In this embodiment, one transparent electrode 2
a and 2c are composed of a plurality of horizontal electrodes corresponding to the state in which the original is oriented horizontally, and the other transparent electrodes 2b and 2d are composed of a plurality of vertical electrodes corresponding to the state in which the original is oriented vertically. As a result, since electrodes for making the document horizontal and those for making the document vertical do not coexist as electrodes forming one transparent electrode, the structure of each transparent electrode 2a to 2d is simpler than the conventional one. As well as
Each of the electrodes 7 to 16 and 19, which form the transparent electrodes 2a to 2d,
Since each of 20a to 20j, 21, 22a to 22j has a portion in contact with the periphery of the transparent electrodes 2a to 2d,
Unlike the conventional case, the wiring will not obstruct the display state of the display layer. Further, in the configuration of the transparent electrodes 2a to 2d as described above, one of the transparent electrodes has a zero potential depending on the input direction of the original, and the other transparent electrode has a plurality of horizontal electrodes or a plurality of horizontal electrodes depending on the original size. Since the voltage is selectively applied from the vertical electrodes, unlike the prior art, no voltage is applied to an unnecessary portion of the display layer 3, so that the display layer 3 is inadvertently translucent. That is, the appropriate display with excellent visibility is performed according to the size of the document without causing the part.

In the present embodiment, the platen device in which the display layer 3 is formed of the liquid crystal / polymer composite material has been described, but the platen device of the image reading apparatus and the control method therefor according to the present invention are of course the embodiments described above. However, the present invention is not limited to the above, and can be applied to any one as long as it has a display panel capable of displaying the document size and the like on the platen. For example, the present invention is also applicable to a platen device using a liquid crystal material other than a liquid crystal / polymer composite material for a display layer, a platen device using an electroluminescent display, a platen device using an electrochromic display, and the like. It is possible and can contribute to the improvement of the display quality according to each device.

[0029]

As described above, according to the present invention,
When the two transparent electrodes sandwiching the display layer are composed of a plurality of electrodes, the electrodes for inputting the document vertically and the electrodes for inputting the document horizontally should not be mixed in each transparent electrode. By configuring, it is possible to select electrodes appropriately according to the document size and the reading direction of the document, and to make only the necessary part of the display layer in the transparent state, so that the appropriate visibility according to the document size and the reading direction of the document can be obtained. The effect is that excellent display is performed. Further, each transparent electrode is composed of a plurality of electrodes for vertically inputting a document or a plurality of electrodes for horizontally inputting, and the electrodes for vertical input and the electrodes for horizontal input may coexist. Since there are no transparent electrodes, the plurality of electrodes forming the transparent electrode can be arranged so as to have a portion located at the peripheral edge of the transparent electrode, and therefore, the wiring to each electrode is arranged to pass the transparent electrode. The effect is that the wiring does not affect the display state. Furthermore, by setting all of the plurality of electrodes forming one transparent electrode to an equal potential and applying a voltage selectively to the plurality of electrodes forming the other transparent electrode according to the document size, As compared with the prior art in which a voltage is selectively applied to a plurality of electrodes forming each transparent electrode, the operation is simplified and the operability is improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a structure of one transparent electrode in a first embodiment of a platen device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a schematic configuration of a platen device according to the present invention.

FIG. 3 is a block diagram showing a configuration example of a control unit for controlling the platen device according to the present invention.

FIG. 4 is a plan view showing an operation example of the first embodiment of the platen device according to the present invention.

FIG. 5 is a plan view showing the structure of one transparent electrode in the second embodiment of the platen device according to the present invention.

FIG. 6 is a plan view showing the structure of the other transparent electrode in the second embodiment of the platen device according to the present invention.

FIG. 7 is a plan view showing an operation example in the second embodiment.

FIG. 8 is a plan view showing a configuration example of a transparent electrode in the platen device which is the basis of the present invention.

[Explanation of symbols]

2a, 2b, 2c, 2d ... Transparent electrode, 3 ... Display layer,
7 ... B6 horizontal electrodes, 8 ... A5 horizontal additional electrodes, 9 ... B5
Horizontal additional electrode, 10 ... A4 Horizontal additional electrode, 11 ... B4
Horizontal additional electrode, 12 ... A3 Horizontal additional electrode, 13 ... B
6 vertical electrodes, 14 ... A5 vertical additional electrodes, 15 ... B5
Vertical additional electrode, 16 ... A4 Vertical additional electrode, 17 ... A
3 horizontal additional electrodes, 18a ... Operation part, 18b ... Electrode selection part, 18c ... Applied voltage control part

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[Procedure amendment]

[Submission date] July 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

1A and 1B are plan views showing a structure of one transparent electrode in a first embodiment of a platen device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a schematic configuration of a platen device according to the present invention.

FIG. 3 is a block diagram showing a configuration example of a control unit for controlling the platen device according to the present invention.

FIG. 4 is a plan view showing an operation example of the first embodiment of the platen device according to the present invention.

FIG. 5 is a plan view showing the structure of one transparent electrode in the second embodiment of the platen device according to the present invention.

FIG. 6 is a plan view showing the structure of the other transparent electrode in the second embodiment of the platen device according to the present invention.

FIG. 7 is a plan view showing an operation example in the second embodiment.

8A and 8B are plan views showing a configuration example of a transparent electrode in the platen device which is the basis of the present invention.

[Explanation of reference numerals] 2a , 2b , 2c, 2d ... Transparent electrode, 3 ... Display layer,
7 ... B6 horizontal electrodes, 8 ... A5 horizontal additional electrodes, 9 ... B5
Horizontal additional electrode, 10 ... A4 Horizontal additional electrode, 11 ... B4
Horizontal additional electrode, 12 ... A3 Horizontal additional electrode, 13 ... B
6 vertical electrodes, 14 ... A5 vertical additional electrodes, 15 ... B5 vertical additional electrodes, 16 ... A4 vertical additional electrodes, 17 ... A3
Horizontal additional electrode, 18a ... Operation part, 18b ... Electrode selection part, 18c ... Applied voltage control part

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (4)

[Claims] 1. A display layer sandwiched between two transparent electrodes, and the display position of the document is displayed according to the size of the document to display the placement position and size of the document. In the platen device of the image reading apparatus, one of the two transparent electrodes is composed of a plurality of horizontal electrodes for combining various document sizes and inputting the document in a horizontal direction by combining, and the other of the two transparent electrodes. Is a platen device for an image reading apparatus, which is composed of a plurality of vertical electrodes adapted to various document sizes depending on combinations and for inputting a document vertically. 2. A display layer sandwiched between two transparent electrodes, and the display position of the document is displayed according to the size of the document so that the placement position and size of the document are displayed. In the platen device of the image reading apparatus, one of the two transparent electrodes is composed of a plurality of horizontal electrodes for combining various document sizes and inputting the document in a horizontal direction by combining, and the other of the two transparent electrodes. Is composed of a plurality of vertical electrodes adapted to various original sizes depending on the combination and for inputting the original vertically, and a reading setting means for setting the paper size and the input direction of the reading original, and the reading setting. An electrode selecting means for selecting an electrode to which a voltage is applied from a plurality of electrodes forming the two transparent electrodes according to the data set by the reading means; A platen for an image reading apparatus, comprising: an applied voltage control unit that generates a required voltage according to set data and applies a voltage to the electrode selected by the electrode selection unit. apparatus. 3. The applied voltage control means sets a zero potential to all of the plurality of horizontal electrodes forming one transparent electrode and sets the other transparent electrode to the other when the reading setting means sets the portrait input of the original. 3. The platen device for an image reading apparatus according to claim 2, wherein a specific voltage is applied to the vertical electrode selected by the electrode selection means among the plurality of vertical electrodes that are configured. 4. A display layer sandwiched by two transparent electrodes, and the display position of the document is displayed according to the size of the document so that the placement position and size of the document are displayed. A platen device of an image reading apparatus, wherein one of the two transparent electrodes is composed of a plurality of horizontal electrodes adapted to various original sizes by combination and for laterally inputting an original, and the two transparent electrodes. On the other hand, in the control method of the platen device of the image reading apparatus which is suitable for various document sizes depending on the combination and comprises a plurality of vertical electrodes for inputting the document in the vertical direction, when reading the document in the horizontal direction, All of the vertical electrodes forming the other transparent electrode are set to the same potential, and the plurality of horizontal electrodes forming the one transparent electrode are selectively selected according to the size of the document to be read. When a voltage is applied and the document is read in the portrait orientation, all the horizontal electrodes forming the one transparent electrode are set to the same potential, and the plurality of vertical electrodes forming the other transparent electrode are set to the same. A platen for an image reading apparatus characterized in that all or part of the display layer is brought into a display state in accordance with the size of the document and the input direction by selectively applying a voltage according to the size of the document to be read. Device control method.