JPS616726A - Tablet of input device for multi-item information - Google Patents

Abstract

PURPOSE:To reduce electrostatic capacity and to increase a signal scanning speed by forming an internal electrode of a tablet as a fylfot pattern and surrounding the internal electrode by an external electrode. CONSTITUTION:An earth electrode 11 is formed like parallel crosses on a printed wiring board 10 and a reference electrode pattern 12 is formed in a square area surrounded by the electrode 11. The pattern 12 is formed by the internal electrode 13 and the external extrode 14 formed on the inside of said electrode 11 so as to surround the electrode 13. A through hole 15 is formed on the center part of said area and the internal electrode 13 is provided with four leg chips e.g. expanded in the vertical and horizontal directions as the starting points including the through hole 15 and formed like a fylfot bent by 90 deg. from its fixed positions in the clockwise direction. The external electrode 14 surrounding the internal electrode 13 has a square frame 16 and four leg chips 17 engaged with the leg chips of the internal electrode 13. Coupling chips 18 are formed on the opposite two sides of the frame 16 in the external directions respectively from their center parts as signal lines for adjacent electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention provides a multi-item information input device for inputting desired data to an information processing device including a computer or the like via a capacitively coupled detection pen. This is about a tablet.

[Prior Art] As is well known, a multi-item information input device retrieves desired data from data stored in a storage device in a central information processing device and inputs it into a computer, etc. This is to ensure that arithmetic processing is performed according to a predetermined program, and a display device is also placed in the same place as the multi-item information input device so that the results can be checked. There are many.

Adding a slight explanation to the conventional example shown in FIG. 6, on the tablet 2 of the multi-item information input device ■,
Call addresses 4 are displayed in a matrix in correspondence with data stored in the central information processing device 3.

When, for example, a detection pen 5 is applied to an address corresponding to desired data in the calling address 4, the address signal is extracted by electrostatic coupling and sent to the central information processing device 3 via the controller 6. In the information processing device 3, address 1 4G
The data corresponding to the number is retrieved from the storage device and processed by a computer or the like. The results are sent back to the multi-item information input device and displayed on a screen such as a display device 7 via the controller 6.

In this conventional example, the tablet 2 includes, for example, a printed wiring board (not shown) on which electrode patterns for generating address signals are formed in a matrix, and an electrically insulating film sheet attached to overlap the board. On this film sheet, the call address 4 is displayed, for example, by printing or the like, in accordance with the formation position of the electrode pattern. The signals emitted from the controller 6 are sequentially divided into these electrode patterns, and each position is scanned from two directions: the horizontal axis and the vertical axis, that is, the r row and the column. .

For this reason, the controller 6 includes a clock oscillator as a signal source, a counter for counting the clock oscillator, a decoder for forming row and column scanning signals from the counting output, and in some cases, a clock oscillator to be sent out. Convert the above call signal into a signal code that can be used by the central information processing device,
On the contrary, some devices are equipped with a code converter for converting the communication signal code of the processing result sent back so that it can be displayed on the display device 7.

Here, to continue the explanation by returning to the tablet 2 again, conventionally, when each electrode pattern of the above-mentioned "r row" is formed on the surface of a printed wiring board, for example, each electrode pattern of "1 column" is formed on the printed wiring board. The area of the electrode pattern on the back side is larger than the electrode pattern on the front side in order to strengthen the electrostatic coupling with the detection pen 5. It is generally slightly larger than the pattern. For this reason, a capacitor with a relatively large capacitance is formed by both the row and column electrode patterns, which has an adverse effect such as attenuating the scanning signal.
This is as pointed out in the proposal of the invention in Publication No. 3-109429. The invention proposed in the same publication in which electrode patterns are formed complementary to each other is extremely effective in reducing the above-mentioned adverse effects, but recently there has been a desire to speed up the scanning of electrode patterns. Therefore, it is necessary to further reduce the capacitance between the two electrodes.

Furthermore, as for the actual display method of the above-mentioned call address 4, a so-called "heading" is usually attached in many cases. Languages, symbols, or characters that can be used are commonly used. In such a case, as the number of stored data increases, the number of headings increases accordingly, and the number of characters and symbols that make up one heading also increases accordingly. For example, in a certain address matrix, the range in which characters and symbols displaying headings are arranged may be larger than the area in which the electrode patterns are formed. Therefore, depending on how the detection pen 5 is applied, the electrostatic coupling with the electrode pattern may not be in the same state every time.
The extracted address signal may be unstable, or in some cases, there is a possibility that an incorrect address signal may be sent.

[Purpose of the Invention] This invention was made in view of the above points, and its first purpose is to form both row and column electrode patterns on one side of a printed wiring board and reduce the electrostatic capacitance between them. The object of the present invention is to realize a tablet as a multi-item information input device that can further speed up signal scanning.

A second object of the present invention is to form an electrode pattern with a reference electrode pattern and a composite electrode pattern in which the reference electrode patterns are connected, and to display, for example, a heading with a relatively small number of characters on the reference electrode pattern, To provide a tablet of a multi-item information input device in which a stable address signal can be taken out without being affected by how a detection pen is applied by displaying a heading with a relatively large number of characters on a composite electrode pattern.

[Structure of the Invention] The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows an example of a reference electrode pattern according to the present invention. Referring to the figure, for example, ground electrodes 11 are formed in a grid shape on a printed wiring board 10, and a reference electrode pattern 12 is formed within a rectangular area surrounded by the ground electrodes 11. The reference electrode pattern 12 includes an internal electrode 13 and an external electrode 14 surrounding the internal electrode 13 and formed inside the ground electrode 11.

In this embodiment, a through hole 15 is provided approximately at the center of the area surrounded by the ground electrode 11.

The internal electrode 13 includes the through hole 15 and has, for example, four legs extending from the through hole 15 in the vertical and horizontal directions. For example, 90 degrees clockwise from the middle of the
Folded! It is formed in a fr (manshi) shape.

The external electrode 14 surrounding the internal electrode 13 has a rectangular frame 16 formed along the inside of the ground electrode 11. For example, four leg pieces 17 are provided so as to fit into the space. Note that connection pieces 18 and 18 are provided on two opposing sides of the frame 16, respectively, extending outward from the center of the frame 16, and when this reference electrode pattern is arranged in a matrix, the adjacent electrodes It is designed to be used as a signal path between

In the above embodiment, the case where the reference electrode pattern 12 is square as shown in the figure is described, but it is possible to have a circular shape or a polygonal shape other than that shown in the figure, for example.
The number of leg pieces is not limited to four. However, when the reference electrode pattern is arranged in a matrix, the rectangular electrode shown in the above embodiment is better at reducing unnecessary gaps between adjacent electrodes than circular or other polygonal electrodes. This is advantageous in terms of effective use of space.

FIG. 2 shows an example of a composite electrode pattern 20 formed by arranging, for example, two reference electrode patterns 12. In this composite electrode pattern 20, the earth electrode 2
1 is approximately twice as large as the ground electrode 11 of the reference electrode pattern 12, and accordingly, the frame 2 of the external electrode 22 is
3 is also about twice the size. Within this external electrode 22, two internal electrodes 24, 24 are provided which are formed substantially similar to the internal electrode 13 shown in FIG. 1 above. Note that a through hole 25 is formed approximately in the center of this composite electrode 20. This through hole 2
Reference numeral 5 is for connecting the two internal electrodes 24 24 on the back side of the printed wiring board 10 . The opposing longitudinal frame 23 of the external electrode 22 has deformable leg pieces 26, 26 extending from the inside thereof, so that the through hole 23
5 and are connected so as to surround the external electrode 2.
2 is divided into two rooms.

FIG. 3 shows an example of a tablet 28 to which the reference electrode pattern 12 and composite electrode pattern 20 are applied. That is, the printed wiring board 29 has, for example, a plurality of standards "?B" and a polar pattern 1 on its surface side.
2 and a composite electrode pattern 20 are formed in a matrix shape as shown. In the case of this embodiment, for the horizontal electrode group corresponding to row r J, for example, the composite electrode pattern 20 is applied to the first electrode on the left end, and the reference electrode is applied to the second electrode on the right side and below. Pattern 12 is applied. This horizontal electrode group is formed in multiple stages in the vertical direction, and the internal electrodes 13 and 24 are connected to the back surface of the printed wiring board 29 through through holes 15 and 25 provided respectively. It is connected to a connecting channel 30.30 formed on the side and shown in dotted lines. In these electrode groups, the external electrode 14 of each reference electrode pattern 12 and the external electrode 22 of the composite electrode pattern 20 are laterally connected via the connecting piece 18, and among them, for example, the composite electrode that is the first electrode External electrode 2 of pattern 20
2 are connected to respective corresponding terminals of the connector 31. Similarly, the internal electrodes 13 and 24 are connected to corresponding terminals of the connector 32, respectively. Note that a ground electrode 33 is provided between the electrode groups, and is connected, for example, to the right end side or back side (not shown) of the pudding 1 to the wiring board 29, and is connected to the ground terminal of the connector. ing.

Pudding 1 to wiring board 2 on which electrode groups are formed as described above
For example, an electrically insulating film sheet 34 is attached to the top 9 using an adhesive or the like.

As mentioned above, this film sheet 34 has the address signal corresponding to the desired data easily called out.
For example, a heading 35 made up of one character, headings 36, 37 made up of a plurality of characters, etc. are commonly displayed. In this case, the heading 35 indicates each reference electrode pattern 12.
headings 36, 37, etc. are displayed at positions corresponding to each composite electrode pattern 20.

FIG. 4 shows an equivalent circuit of the tablet 28 consisting of the electrode group formed as shown in FIG. 3 above. In the figure, the first row is composed of the first to mth rows, which are connected to the first to mth terminals of the connector 3j, respectively.

Similarly, the "columns" are composed of the first to nth columns, and are connected to the first to nth terminals of the connector 32, respectively. When pulse-like signals are sequentially applied from the controller 6, for example, from the 1st terminal to the nth terminal of the connector 32, horizontal axis scanning is performed. Similarly, connector 31
By sequentially applying a pulse-like signal from the 1st terminal to the mth terminal, vertical axis scanning is performed. Here, the electrodes connected to each terminal of the connector 31 are the external electrode 14 of each reference electrode pattern 12 and the external electrode 22 of each composite electrode pattern 20.
The electrodes connected to each terminal of the connector 32 represent the internal electrodes 13 and 24, respectively.

In this case, the scanning signal is applied sequentially, for example, from each terminal of the connector 31 to each terminal of the connector 32.

It is not applied to all terminals at the same time. Therefore, the equivalent circuit in FIG. 4 can be replaced with an equivalent circuit viewed from one terminal. That is, as shown in FIG. 5(a), it can be replaced with an equivalent circuit viewed from the No. 1 terminal of the connector 31, for example. In this example, the resistance component and inductive component of the wiring pattern of each electrode are so small that they can be ignored with respect to the scanning signal, but the capacitance component formed by the external electrode and internal electrode in each electrode section cannot necessarily be ignored. . For this reason, the equivalent circuit in (a) above is expressed using a capacitance symbol. That is, the composite electrode pattern 20
is represented by C1, and the reference electrode pattern 12 is represented by C2. Note that the capacitance between the wiring pattern of the No. 1 terminal of the connector 31 and the snow is shown as Cm1,
The capacitance between the wiring pattern of each terminal and ground is Cnz,
It is indicated by Cnz... In the figure, for example, when a scanning signal is applied to the No. 1 terminal of the connector 31, the other terminals of the connector 32 are generally turned off except for the ground terminal G. 6 Therefore, this figure is rewritten as (b). can be written as (c). The capacity iC shown in the same figure (c) is the same as C1 and Cn1. , C2 and C,n 2-, etc.

With respect to the scanning signal applied between the terminals 1 and 0, it is desirable that the input impedance seen from these terminals into the circuit is as large as possible, and therefore care is taken to minimize the capacitance component. In this case, once the matrix arrangement of each electrode is determined, the values of the capacitance components Cm1 and C111 to Cn due to the wiring pattern will naturally fall within a certain range, but the values of C1 and C2 are greatly influenced by the way the electrodes are configured. . 5 in this invention
Although it is difficult to perform a theoretical analysis on the shaped electrode pattern, it is clear that the capacitance value is considerably smaller than in the conventional case where electrode patterns are formed on both sides of the printed circuit board 1 and the wiring board 29. Confirmed by actual measurement data.

[Effects of the Invention] As explained above, the tablet 1-28 of the multi-item information input device according to the present invention has a printed wiring in which a double positive pattern for connecting an address signal is formed on the - side surface. The printed circuit board 29 (attached to the circuit board 29,
It is provided with filmseats 1-34 on which headings 35 to 37 for data retrieval are displayed. The electrode pattern is composed of two types, for example, a reference electrode pattern 12 and a composite electrode pattern 20 formed by arranging two of these patterns, and is formed in a matrix on the printed wiring board 29. These electrode structures include, for example, 13 and 24 formed in a 5-shape, and external electrodes 14 and 22 formed to surround this and enter into the 5-shape pattern.
These external electrodes] 4 or 22 provide stable electrostatic coupling to the detection pen 5. Further, the headings 35 to 37 of the film sheet 34 are displayed in positions of chairs and 1L of the reference electrode pattern 12 or composite electrode pattern 20, for example, depending on the number of characters composing them. Therefore, even if it is a horizontally long heading made up of multiple characters, for example, as long as the detection pen 5 is applied to the displayed heading, the address signal will be stabilized in combination with the structure of the electrode pattern formed in the above-mentioned date shape. 5, it is possible to prevent a situation where an incorrect address signal is taken out. Furthermore, since the capacitance formed by the internal electrode 13 or 24 and the external electrode 14 or 22 can be reduced, it has become possible to realize a faster multi-item information input device in the tablet 1. . .

[Brief explanation of the drawing]

1 to 517I all relate to embodiments of the present invention, and FIG. 1 is a bottom view of bracket 7 (11 electric pattern pattern,
The figure is a plan view of the composite electrode pattern, and Figure 3 is the tablet 1-
FIG. 11 is an equivalent circuit thereof, and FIG. 5 is an equivalent circuit including the terminals of the connector 3 of the above-mentioned No. 4I2I. FIG. 6 is an explanatory sketch showing the relationship between the multi-item information input device, the information manpower device, and other devices. In the figure, 1 is a multi-item information input device, 5 is a detection pen, and 10
．． 29 is a printed wiring board, 12 is a base i (1 electrode pattern, 13.24 is an internal electrode, 1/l, 22 is an external electrode,
15.25 is through pole, 16.23 is frame, 17.2
6 is a leg piece, 20 is a composite electrode pattern, 28 is a tablet 1
-134 is the heading for film sheets 1-135 to 37. Patent applicant General Co., Ltd. Agent Patent attorney Takuya Ohara Figure 4 ()? (lid) () korita) (ko ga 7931) (ko sweat 32) (b) (c)

Claims (2)

[Claims] (1) Electrodes to which pulsed signals are sequentially applied are arranged in a matrix on an electrically insulating substrate, and the electrodes are connected via capacitive coupling by a detection pen from a dielectric film sheet attached to the substrate. In the tablet, which is a multi-item information input device that takes out an address signal, the electrodes are internal electrodes formed in a ■-shaped pattern by four orthogonal electrode pieces including a through hole provided in the substrate in the center. , and an external electrode formed in a rectangular frame-like pattern surrounding the internal electrode, and the frame-like pattern of the external electrode includes a plurality of electrodes extending between the four electrode pieces facing toward the center of the internal electrode. A tablet of a multi-item information input device, characterized in that a plurality of electrode pieces are formed thereon. (2) A plurality of electrodes to which pulsed signals are sequentially applied are arranged in a matrix on an electrically insulating substrate, and a detection pen is applied to the electrodes through capacitive coupling from a dielectric film sheet attached to the substrate. In the tablet of the multi-item information input device for extracting the address signal of the electrode, the electrode group arranged in a matrix is formed by four orthogonal electrode pieces including a through hole provided in the substrate in the center. Internal electrodes formed in a ■-shaped pattern,
a first electrode comprising an external electrode formed with an electrode piece extending between the four electrode pieces facing toward the internal electrode from a rectangular frame-like pattern formed surrounding the internal electrode; and a second electrode formed by arranging a plurality of first electrodes in a row in the horizontal direction (or vertical direction), and on the film sheet, there are formed areas corresponding to the formation areas of the first and second electrodes, respectively. A tablet as a multi-item information input device, characterized in that a symbol for calling an address signal of a large size is displayed.