JPS5820982Y2 - bookmark type keyboard - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a book mat type keyboard.

Book mat type keyboards have recently been attracting attention because they allow users to easily input a large number of items without requiring any skill.

This book mat type keyboard consists of a main body and a book.

For example, as shown in FIG.
A large number of key switch operation parts 11 protrude upward in a matrix pattern.

Although the key switch body is not shown, it is mounted on a printed circuit board within the device body 1.

The book 2 is constructed by attaching a plurality of mats 21 to a side plate 22 so as to be openable and closable.

Each page is constructed from the front and back sides of the mat 21.

The mat 21 is similarly provided with holes 211 arranged in a matrix to allow the aforementioned operation section 11 to pass therethrough.

When the book 2 is mounted on the surface plate 10 of the main body 1 of the apparatus, the operating section 11 will protrude through each hole 211 of each mat 21.

Items to be entered for each hole 211 are written on each page (front and back of the mat 21).

When entering a desired item, it is sufficient to open the page on which this item is entered and press the operating section 11 corresponding to that item.

By the way, this type of input is possible because double-page spreads are detected.

An encoded output corresponding to the input item is obtained by the detection output of the two-page spread keyage and the output of the key switch.

This double-page spread can be determined by how many sheets of the mat 21 are lying on the left side or how many sheets are lying on the right side.

Conventionally, this fallen mat 21 was detected and the detection output was encoded using a static encoder.

Therefore, as the number of pages increases, the number of attached circuits increases.

The purpose of this invention is to provide a bookmat type keyboard that can obtain encoded output corresponding to two-page spreads with a simple configuration, and as a result can reduce costs.

An embodiment of this invention will be described below.

In FIG. 2, the book 2 is mounted on the front plate 10 of the apparatus main body 1 as shown by the arrow.

Although not shown in FIG. 2, the main body 1 and the book 2 are provided with a key switch operating portion 11 and a hole 211, respectively, as in FIG. 1.

Photoelectric detection device groups 12a and 12b are provided at asymmetric positions on the left and right sides of the book mounting portion of the top plate 10, respectively.
(See Figure 4).

There are, for example, 16 mats 21 that make up the book 2, and the mats 21 are 21 (1) in the order of falling to the left.

21 (2) , 21 (3) ,..., 21 (1
6).

The photoelectric detection device group 12a includes mats 21(1) to 21(8).
) is detected to the left.

The photoelectric detection device group 12b includes mats 21(9) to 21(16).
) are lying on the right side.

Specifically, each mat 21 is detected as shown in FIGS. 3 and 4.

In FIGS. 3 and 4, the photoelectric detection device group 12a consists of eight reflective photoelectric detection devices D1 to D8.

Similarly, the photoelectric detection device group 12b also consists of eight reflective photoelectric detection devices D9 to D16 (see FIG. 5).

A reflective portion 212a or a reflective portion 213a is formed at a unique position on the edge of each mat 21.

In other words, the edges of the mats 21 (1) to 21 (8) have 7
The light-transmitting holes 212 are formed in a row, and the light-transmitting holes 212 are not provided in the specific positions of the reflecting portion 212a.
is formed.

Note that eight light-transmitting holes 212 are formed in each of the pines (pine) 21 (9) to 21 (16) without forming the reflective portion 212a.

When the mat 21 is tilted to the left, the light-transmitting hole 212 and the reflecting portion 212a are located above the photoelectric detection device group 12a.

There are 7 transparent holes 21 in the mats 21 (9) to 21 (16).
3 are formed in a row, and the transparent holes 21 are located at specific positions.
3 is not provided to form the reflective portion 213a.

In addition, reflective HB21 is used for Pine) 21(1) to 21(8).
Eight transparent holes 213 are formed without forming holes 3a.

When the mat 21 is tilted to the right, the transparent hole 213 and the reflective section 213a are located above the photoelectric detection device group 12b.

Thus, for example, Mat 21(1), 2 N2).

21 When the three sheets in (3) are turned over to the left, the photoelectric detection device D1. D2. D3 phototransistor 12
2 is enabled to receive light by the reflective HB 212a (the third
(indicated by diagonal lines in the figure).

On the other hand, Matt 21 (16), 21 (15),
21 If you turn over the three cards in (14) to the right,
Photoelectric detection device D16. The D15°N14 phototransistor 122 is enabled to receive light by the reflecting portion 213a.

In this way, it is possible to know the number of mats 210 lying on the left side based on the outputs of the photoelectric detection devices D1 to D16, and as a result, it is possible to obtain an encoded output corresponding to the double-page spread.

A circuit for obtaining an encoded output is configured as shown in FIG. 5, for example.

In FIG. 5, row line X.

-X15 and column line Y. -A matrix circuit 130 is formed from T15.

Row line X-X and column line Y.

-”150 15 A key switch 110 is connected to each intersection position.

Row line X. One end of -X15 is connected to the power supply voltage +5V via a resistor.

The other end is connected to multiplexer 134.

One end of the column line YO"""T15 is connected to an output terminal TO"""T15 of the decoder 133, respectively.

The 4 bits of the BCD output signal of the counter 131 are input to this decoder 133, and the output terminals 'ro-'r15 are sequentially set to rLJ.

Counter 131 counts the rising edge of the clock pulse.

Column line Y. ~Y15 At the other end is a photoelectric detection device D1~
The cathodes of the light emitting diodes 121 of D16 are connected to each other.

The anode of the light emitting diode 121 is connected to the power supply voltage +5V through a current limiting resistor.

Phototransistor 12 of photoelectric detection devices D1 to D16
The emitter of No. 2 is grounded.

The collector of the phototransistor 122 is Wired-O
After being R-connected, transistor 140 forms the NO
Connected to T circuit.

The collector output of transistor 140 is connected to the input terminal of counter 132 via exclusive OR circuit 141 and NAND circuit 138.

The exclusive OR circuit 141 further includes a counter 1.
The signal of the most significant digit of No. 31 is input.

A clock pulse is further input to the NAND circuit 138.

Further, the output of the output terminal T15 of the decoder 133 is input to the reset terminal of the counter 132 via a delay circuit 139, a NOT circuit 136, and an AND circuit 137.

The output of the terminal T15 is directly input to the AND circuit 137.

Furthermore, the output of the terminal T15 is also input to the trigger terminal of the temporary storage circuit 135.

The temporary storage circuit 135 stores the contents of the counter 132 in accordance with the output of this terminal T15.

With such a configuration, it is possible to obtain an encoded output corresponding to a double-page spread using a scanning method.

That is, scanning is performed by the counter 131 and the decoder 133, and the photoelectric detection devices D1 to D16 are sequentially energized.

Then, for each cycle of this scanning, the number of pulses (0 point signal) corresponds to the number of mats 21 falling to the left.
is formed.

These pulses are counted by the counter 132, and the counted contents are stored in the temporary storage circuit 135 at the last timing of the cycle (timing of the rising edge of the pulse occurring at the point ■), so that an encoded output corresponding to the double-page spread is obtained. There is.

The counter 132 is then reset at a predetermined timing (timing at which a pulse occurs at a point) to prepare for the next scan.

For example, when only one mat 21 (1) is fallen on the left side, power is supplied to the photoelectric detection devices D1 to D160 and the light emitting diodes 121 as shown below, and the phototransistor 122 is turned on as shown below. Turn off.

Therefore, in FIG. 6, the Wired-OR signal mark is T.

, becomes "L" in the T8 to T15 interval. The exclusive OR circuit 141 receives the most significant digit signal QD of the counter 131.
(Since the signal (su) is input, its output signal O
is T.

Only the section is marked ■.

Since this signal O and the clock pulse are input to the NAND circuit 138, its output signal O is T.

Only the second half of the section becomes rLJ. On the other hand, since the signal ■ is the output of the output terminal T15 of the decoder 133, T1
Only 5 becomes rLl.

This signal is delayed by a delay circuit 139 and further NOT
It is inverted by a circuit 136 and becomes a signal ○.

Therefore, signal 6 rises a little later than the start of the TI5 interval and becomes "-H", and then holds rHJ for the same amount as the TI5 interval, and at other times rLJ
become.

This signal is input to an AND circuit 137.

Since the signal ■ is also directly input to this AND circuit 137, the output signal [F] of the AND circuit 137 is T
It rises at the same time as the end of the I5 section, and from that point on, rHJ is maintained for the delay time of the delay circuit 139, and otherwise becomes rLJ.

Therefore, the counter 132 is first T.

It is reset at the first timing of the section, and then the rising edge of signal 0 is T.

Count once in the section. Note that in order to prevent the reset input of the counter 132 from having an adverse effect on the counting operation, the delay circuit 1
It is necessary to make the delay time of No. 39 shorter than the time width of the clock pulse.

T1. T2. . . . The scanning progresses sequentially in the T15 interval, and at the end of the T15 interval, the temporary storage circuit 135 reads the count contents of the counter 132, that is, "1", at the rising edge of the signal [present]. Remember.

In this way, encoded output "1" according to the two-page spread
get.

Note that the counter 132 is also reset by the signal ■ at the end of the TI5 interval.

However, due to the response delay of the counter 132, the count content read by the temporary storage circuit 135 is the one before the reset.

Therefore, there is no 1,1. Also, mat 21 (1) ~
21 If the 10 pieces in (10) are lying on the left side,
Power is supplied to the light emitting diodes 121 of the photoelectric detection devices D1 to DI6 at the following timing.

At each timing, the phototransistor 122 is turned on and off as described below.

Therefore, in FIG. 7, Wire d-OR
Signal ■ T8. Since it becomes rHl only in the T9 interval, the output signal O of the exclusive OR circuit 141 becomes rHJ only in the To-T9 interval, so the counter 132 has T.

-T9 period, one pulse is inputted one by one, and the count content of the counter 132 becomes "10" in one cycle of scanning.

This "10" is read into the temporary storage circuit 135 at the timing of the end of the TI5 interval, as described above, and is used as an encoded output.

Further, when the mat 21 is completely turned to the left side, the phototransistors 122 of the photoelectric detection devices D1 to D16 are turned on and off as described below at the following timings.

Therefore, in FIG. 8, the Wired-OR signal ■
is "H" in the period T8 to T15, so the output signal O of the exclusive OR circuit 141 is always "H", so a total of 16 pulses are input to the counter 132, one for each period. At the end of one cycle, the count becomes "0".

This is because the counter 132 has 4 bits.

This "0" is read into the temporary storage circuit 135 at the end of the T15 interval as described above, and is used as an encoded output.

In the above embodiment, the matrix circuit 130 is configured as shown in FIG.

~X15 and column line Y.

- Connect a key switch 110 to each intersection position of T15,
An encoded output corresponding to the operated key switch 110 is obtained by a scanning method.

That is, the column line is scanned with the output of the decoder 133,
In addition, the output generated on the row line in response to the operation of the key switch 110 is input to the multiplexer 134, and an encoded output is obtained in accordance with the output of the multiplexer 134.

In this system, a decoder 133 for encoding the output of the key switch, a counter 131, etc. are also used as a circuit for detecting facing pages.

Therefore, the circuit configuration can be further simplified.

As described above with respect to one embodiment, according to this invention, a number of key switches are arranged in a key switch array, and a plurality of mats are bound so as to be openable and closable. a book to be mounted; a matrix circuit formed from a large number of row lines and a large number of column lines; each of the key switches is connected to each intersection of the row lines and column lines; a counter for counting clock pulses; It includes a decoder that sequentially energizes the column lines according to the output of this counter, detects the signal of each row line, and operates based on which row line this signal occurs at the timing when which column line is energized. means for obtaining the encoded output of the key switch;
double-page spread detection means that generates an encoded output corresponding to the double-page spreads of the book, and by opening a desired page of the book and operating a key switch corresponding to an item written on the mat of the double-page spread, the item can be detected. The double-page spread detection means is distributed between reflective parts formed at unique positions of each mat and asymmetrical positions on both sides of the book mounting part. Each of the light emitting parts is connected to each column line and is sequentially supplied with power as the column lines are energized, and the light emitted from each light emitting part is reflected by the reflecting part. A plurality of reflective photoelectric detection devices are configured to reflect light and receive the light at each light receiving portion, and outputs obtained from the light receiving portions of the photoelectric detection devices and the maximum output of the counter for each period of scanning of the column line bias are provided. a detection means for sequentially detecting a number of pulses corresponding to the number of mats lying on one side of the book loading section by detecting a match with the signal of the upper digit; The structure consists of a counter that generates a corresponding encoded output and a memory circuit that reads and stores the counted contents of the counter, so even if the number of pages on the mat increases, the number of attached circuits does not increase as in the conventional case. Since the reflective photoelectric detection devices are distributed and provided at asymmetrical positions on both sides of the book mounting section, the number of photoelectric detection devices can be reduced, thereby making it possible to greatly simplify the circuit.

Furthermore, each light emitting section of the photoelectric detection device is connected to each column line of the matrix circuit, and when each column line is energized, power is supplied to these light emitting sections for one cycle of scanning of the energization of the column line. By detecting the match between the output obtained from the light receiving section of the photoelectric detection device and the signal of the most significant digit of the counter, the number of pulses corresponding to the number of mats lying on one side of the book mounting section is sequentially transmitted. It detects the pulses, counts these pulses, and generates an encoded output according to the spread page, and also serves as a counter and decoder for obtaining the encoded output of the key switch, etc. to detect the spread pages. , the circuit configuration can be further simplified.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the structure of a bookmat type keyboard, Figs. 2 to 8 are for explaining an embodiment of this invention, and Fig. 2 is a perspective view with the external appearance partially omitted. 3 is a schematic perspective view partially omitting the arrangement relationship between the reflective photoelectric detection devices D1 to D8 and the mat 21, and FIG. 5 is a block diagram showing the circuit configuration,
Figure 6 shows the 5th position when only one mat 21 is pushed to the left.
A time chart showing the signals at each point in the figure. Figure 7 is the same time chart when only 10 mats 21 are pushed to the left. Figure 8 is the same time chart when all mats 21 are pushed to the left. . DESCRIPTION OF SYMBOLS 1... Apparatus body, 10... Surface plate, 110... Key switch, 11... Operation part of key switch 110,
12a, 12b... photoelectric detection device group, D1 to D□6.
... Reflective photoelectric detection device, 121... Light emitting diode, 122... Phototransistor, 130... Matrix circuit, 131, 132... Counter, 133...
... Decoder, 134 ... Multiplexer, 135.
...Temporary memory circuit, 136...NOT circuit, 137.
...AND circuit, 138...NAND circuit, 139
...Delay circuit, 140...Transistor, 141.
...Exclusive OR circuit, 2...Book, 21
...Matt, 22...Side plate.

Claims (1)

[Scope of utility model registration request] A key switch array consisting of a large number of key switches arranged, a book made up of a plurality of mats bound so as to be openable and closable and mounted on the key switch arrangement, and a large number of row lines and a large number of column lines. , a matrix circuit in which each of the key switches is connected to each intersection of a row line and a column line, a counter button that counts clock pulses, and a decoder that sequentially energizes the column lines in accordance with the output of this counter. means for detecting a signal on each row line and obtaining an encoded output of an operated key switch depending on which row line the signal occurs at which column line is energized; and a double-page spread of the book. double-page spread detection means for generating an encoded output according to the spread page, and inputting an item by opening a desired page of the book and operating a key switch corresponding to the item written on the mat of the double-page spread. In the book mat type keyboard, the two-page spread detection means is provided at a reflective portion formed at a unique position of each mat, and at asymmetrical positions on both sides of the mounting portion of the book. Each of the light parts is connected to each column line and is sequentially supplied with power as the column lines are energized, and the projected light from each light emitting part is reflected by the reflecting part and sent to each light receiving part. A plurality of reflective photoelectric detection devices adapted to receive light, and a match between the output obtained from the light receiving section of the photoelectric detection device and the signal of the most significant digit of the counter for each period of scanning of the energization of the column line. a detection means for sequentially detecting a number of pulses corresponding to the number of mats lying on one side of the book mounting section; and a counter that counts the pulses and generates an encoded output according to the number of facing pages. and a memory circuit for reading and storing the counted contents of the counter.