JPS605382Y2 - Bookmark type keyboard encoder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a book mat type keyboard encoder that can prevent erroneous inputs caused by the shoulders of key buttons getting caught on the periphery of key insertion holes when the mat is turned over.

Conventionally, a book mat type keyboard encoder (hereinafter simply referred to as an encoder) has been used.

), it optically detects that the book is in a normal viewing condition and creates a strobe signal for data acquisition in the central processing unit based on the detection signal, which eliminates incomplete viewing. This is designed to prevent erroneous input when a key button is pressed when the adjacent bound mats have not completely fallen to the left or right.

However, in general, optical detection means such as those described above have the disadvantage that the state where the mat is about to fall to the left and right is often mistaken as a perfect viewing state, so the mat shifts due to play in the binding holes and the mat falls. If the periphery of the key insertion hole gets caught on the shoulder of the key button just before the button is pressed,
There is a problem in that the press signal from the key button at that time may be mistaken as a normal input signal.

This idea was made to solve the above-mentioned problem unique to this type of encoder, and its purpose is to prevent the shoulder of the key button from getting caught on the periphery of the key insertion hole when the mat is turned over. It is an object of the present invention to provide a book mat type keyboard encoder that can reliably prevent erroneous inputs caused by erroneous input.

A preferred embodiment of this invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a book mat keyboard encoder (hereinafter simply referred to as an encoder) is used.

) 1 consists of a device main body 2 and a book 3 mounted on the device main body 2.

A large number of substantially cylindrical key buttons 5, 5... are arranged protrudingly in the vertical and horizontal directions on the top panel 4 of the device main body 2, and on both sides (the area surrounded by the broken line 6 in FIG. 2), there are required buttons. A number of reflective photoelectric sensors 7 are arranged in a row.

On the other hand, Book 3 has the required number of mats 8. The mats are bound with a binder 9 so that they can be opened and closed, and the binding holes 1G, 10, .

Further, each mat 8 is provided with a circular hole (in this example, a circular hole) 11 corresponding to the arrangement of the key buttons 5, 5, . . . The circular hole (hereinafter referred to as the key insertion hole).

) 11 and the tip of the key button 5 protrudes.

On the other hand, at the edge of each mat 8 facing the arrangement position 6 of the photoelectric sensor, a reflective part 12 and a transmitting part 13 are formed in different arrangements for each mat, as shown in FIG. In the rows, reflective portions 12 are formed by making the material of the mat itself reflective, and transparent portions 13 are formed by perforating this.

FIG. 5 is a circuit diagram showing the electrical configuration of the encoder 1.

In the figure, the photoelectric sensors 7 are shown arranged in rows R1-R16, L1-L, and 6C on the right and left sides, respectively.

And these left and right photoelectric sensors R1%R, 6, L1~
L6 is set so that when the book 3 is completely viewed as shown in FIG. 1, it has a certain relationship with the left and right overlapping mats as will be described later.

That is, as shown in FIG. 3, each mat 8, 8, . . . has a portion that should be a reflective portion 12 or a transparent portion (perforation) 13 (hereinafter referred to as a bit portion).

) is 16 bits, of which only 1 bit is reflected part 1.
2, and all other bit parts are configured to become transparent parts 13.

The bit positions that should become the reflecting portions 12 are set differently for each bit position.

Therefore, as is clear from Fig. 3, when all the mats are tilted to the right and the mats are tilted one by one to the left, the outputs of the photoelectric switches R1 to R16 and L1 to Li6 are shown in Table 1. It will be like this.

As is clear from Table 1, when Book 3 is in perfect condition, that is, when the mats stacked on the top of each left and right are bound next to each other, the left and right photoelectric sensors The number of photoelectric sensors in R1-R16 that are turned on corresponds to the radiation of the mats that are turned over to the left and right, respectively, and the photoelectric sensors that are turned on are adjacent to each other.

In addition, two photoelectric sensors forming a pair having a certain relationship among the left and right photoelectric sensors, that is, (Ln, Rn +; n
= 2, 3, 14) If you look at the night turtle, these will correspond one-to-one to each sighting state shown in Table 1, and both of them will be simultaneously '
If it is decided to turn on, and the state of observation is incomplete, both of the pairs will not turn on at the same time.

In other words, as shown in Table 1, place one mat on the left and one mat on the right.
A state of rapid observation (hereinafter referred to as the first page).

), only the photoelectric sensor pair (Ll, R2) is turned on at the same time, and the mat is tilted two to the left and one to the right (hereinafter, this is referred to as the second page).

), only the photoelectric sensor pair (L2°R3) is turned on at the same time, and similarly, when the nth page is opened, only the photoelectric sensor pair (Ln, Rn-1-1) is turned on.
It turns ON.

The circuit shown in FIG. 5 conversely detects a spread page from the output of the photoelectric sensor based on the relationship between the spread page and the pair of photoelectric sensors as described above.

That is, in FIG. 5, 14 is the clock generator 1.
5 is a counter that counts the output of counter 1, and 16 is a counter that counts the output of counter 1.
It is driven with 4 outputs, and 1 is applied to each output terminal To-T15 in turn.
This is a decoder that outputs L Yopulse.

Each output terminal T of the decoder 16. Two light emitting diodes constituting each photoelectric sensor pair described above are connected in series between T15 and the power supply.

17 and 18 are transistor inverters that also serve as buffers, and the inverter 17 is connected to the right photoelectric sensor R.
The output of each phototransistor constituting 2 to R15 is
The inverter 18 is supplied with the outputs of the respective phototransistors constituting the left photoelectric sensor pile ~L in parallel, and the outputs of these inverters 17 and 18 are supplied to the AND gate 19.

Further, 20 is a similar transistor inverter, and the outputs of two phototransistors constituting each of the right photoelectric sensor R1 and the left photoelectric sensor L16 are supplied in parallel to this inverter 20.

Each output of the ANDNO gate and the inverter 20 is supplied to a NOR gate 21.

Therefore, 1L Yopulse is always outputted to the output side of the NOR gate 21 once every one page scanning period only when the viewing condition of Book 3 is perfect, and the output timing is It corresponds to the page opened at that time.

Reference numeral 22 denotes a latch circuit to which the output of the upper 4 bits of the counter 14 is supplied, and to this latch circuit 22, the output of the NOR gate 21 is supplied as a strobe signal via an inverter 23, and the output of the NOR gate 21 is supplied as a strobe signal. The output of 21 is also used as a strobe for the central processing unit.

Therefore, the page code corresponding to the current page is latched in the latch circuit 22 only when the viewing condition of the book 3 is perfect.

24 is a multiplexer controlled by the output of the upper 4 bits of the counter 14, and each input terminal E of this multiplexer 24;

~E15 are each connected to the power supply +V via a resistor.

And each input terminal E.

-E□5 to the power supply +V (hereinafter, this is called the X line).

) and each output terminal T of the decoder 16.

- A line from T□5 to power supply 10 (hereinafter referred to as Y line).

) A key switch S corresponding to the key button 5 is connected to each intersection with the key button 5, and an XY matrix circuit 25 is configured as described above.

Therefore, the rHJ pulse is output to the output side of the multiplexer 24 at the key scanning timing corresponding to the pressed key button 5.

A latch circuit 26 is supplied with the output of the counter 14, and the output of the multiplexer 24 is supplied as a strobe signal to the latch circuit 26.

Therefore, the key code corresponding to the pressed key button 5 is latched in the latch circuit 26.

27 and 28 are delay flip-flop circuits (
Hereinafter, they will be referred to as the first DFF and the second DFF.

), and each preset terminal PR of these DFF27.28 is fixed to 1H, which is prohibited, and the first
A 1H signal is supplied to the data input terminal of the DFF 27.

Furthermore, the clear terminal CL of each of the first and second DFFs 27 and 28
R is supplied with the output of the NOR gate 21, and the trigger terminal T of the second DFF 28 is supplied with the decoder 16.
Similarly, the output T15 of the decoder 16 is supplied to the trigger terminal T of the first DFF 27 via the delay circuit 29.

Therefore, the 1LJ signal is outputted to the Q output terminal of the second DFF 28 only when the viewing condition of the book 3 is perfect.

30 is a timer signal, and the signal level of the Q output terminal of this timer signal 30 is the same as that of the second signal supplied to its control terminal B.
1L to 1H in response to the rise of the σ output of DFF2B
In addition, in response to the fall of the Q output of the second DFFF 28, the signal is delayed for a certain period of time, and at the same time as that time-up, the signal changes from H to 1L.

The Q output of this timer circuit 30 and the second DFF
The Q output of 28 is supplied to an AND circuit 31.

Further, 32 is a light emitting diode for indicating that the viewing condition is incomplete.
2 is designed to light up in accordance with the Q output rHJ of the second DFF 28.

Therefore, the second DFF 28 is on the output side of the AND gate 31.
In response to the rising edge of the Q output of , an rH Yopulse having a certain length is output, and the outputs ``H, J'' of the AND gate 31 are used to inhibit or inhibit the strobe signal sent to the central processing unit, for example. If the central processing unit is configured to prohibit manual reading, the key code or page code in the flame processing device will be read for a certain period of time after the reading status of Book 3 changes from 1 incomplete to 1 complete. Reading operations can be prohibited.

In the above circuit configuration, when mat 8 is turned over to change the observation page of book 3, mat 8 shifts to the fourth page.
As shown in Figures A and B, when the key button 5 is pressed at the edge of the key insertion hole 11 just before the mat 8 falls over, the latch circuit 26 receives a key code corresponding to the key button that was pressed by mistake at that time. is latched.

Furthermore, even if the mat 8 is not completely fallen down, the mat 8 already exists on the extension line of the detection beam P emitted from the photoelectric sensor 7 as shown in FIG. 4B, so the photoelectric sensor The sensor 7 erroneously recognizes this state as a completely spread state, and as a result, a predetermined pulse signal is output to the output side of the NOR circuit 21 at the page scanning timing corresponding to the current page. The page code corresponding to the double-page spread is also latched in the circuit 22.

These key codes and page codes are then sent to the central processing unit along with a strobe signal (in this example, the same as the strobe signal for the latch circuit 22).

On the other hand, in a state in which the mat has not fallen to either the left or right side during the process of turning over the mat, that is, in an incomplete viewing state, the output of the second DFF 28 is maintained at 1L as described above, so the AND gate 31 is closed and no prohibition signal is output, but when the mat is about to fall completely to either the left or right side, the photoelectric sensor is activated, and the Q output of the second DFF 2 f3 changes from 1L1 to rHJ. At the same time, after a certain time delay, the output of the timer circuit 30 changes from 1H to "L", and as a result, a 1H Yo pulse signal having a certain time length, that is, a prohibition signal, is generated on the output side of the AND gate 31. Output.

Then, this prohibition signal is sent to the central processing unit along with the key code, page code, and strobe signal, and as a result, the central processing Reading of each of the above codes by the device is prohibited.

In other words, even if the key button is pressed by mistake just before the mat is about to fall over, that key code will not be read into the central processing unit, and normally in such cases the key button will get caught on the periphery of the key insertion hole. However, the key will eventually fit into the key insertion hole, so if the reading operation on the central processing unit side is prohibited for a certain period of time, malfunctions when turning over the mat can be reliably prevented.

As is clear from the above explanation, this invention consists of a mat detection circuit that detects the viewing condition of the book by irradiating a detection beam from below the book onto the reflective transmissive code section formed on each mat, and In a book mat type keyboard encoder equipped with a viewing condition determining circuit that determines whether the viewing condition is 1 complete or incomplete based on the fact that they are bound next to each other, one of the outputs of the spread condition determining circuit is A prohibition signal generation circuit is provided that outputs a signal for inhibiting the output of a key code or the like or the capture operation of a key code or the like on the central processing unit side for a certain period of time in response to the timing of movement from incomplete YO to 1 complete YO. This makes it possible to reliably prevent erroneous inputs caused by the shoulder or head of the key button getting caught on the periphery of the key insertion hole when the mat is turned over, further improving the reliability of this type of encoder. It is something that can be done.

[Brief explanation of drawings]

Fig. 1 is an overall perspective view of a book mat type keyboard encoder showing an embodiment of this invention, Fig. 2 is an overview perspective view showing the relationship between the book and the main body of the device, and Fig. 3 is a perspective view of each mat type keyboard encoder. FIG. 4 is an enlarged perspective view showing the relationship between the cord portion and the photoelectric sensor; FIGS. 4A and 4B are explanatory views of the operation of this invention; and FIG. 5 is a circuit diagram showing the electrical configuration of this invention. 1...Book mat type keyboard encoder,
3...Book, 5...Key button, 8
...Mat, 12, 13... Reflective transmission code section, 17, 18.19, 20... Spread state determination circuit, 30, 31... Prohibited circuit, 7. R
1~R□6. L1-L, 16... Mat detection circuit.

Claims (1)

[Claims for Utility Model Registration] It has a mounting table for placing the book in the open state, and a plurality of columnar key buttons and a plurality of reflective photoelectric sensors on the left and right mat mounting areas on the mounting table, respectively. a device body in which the mats are arranged symmetrically; a plurality of mats are bound together with a binder through binding holes with sufficient play to smoothly open and close; When the key buttons protruding from the mounting base are placed in a viewing state, insertion holes are formed through which the key buttons protrude upward, and holes and non-contact holes are formed at positions corresponding to the photoelectric sensors. A book in which a multi-bit mud code is formed, with only one bit being a non-hole part, which is different for each mat; The light-emitting elements of the left and right photoelectric sensors that are to detect each pair of mats bound next to each other are sequentially and cyclically simultaneously driven, and the logical product of the light-receiving element outputs of these pair of photoelectric sensors is established. a viewing and reading state determination circuit that determines whether or not the current viewing and reading state is normal based on the above; a two-page spread detection circuit that latches the counted value of the counter at the timing when the counter is scanned and sends it to the central processing unit as a page code; an operation key detection circuit that increments a counter in synchronization with timing, latches the counted value of the counter at the timing when the operation output of the switch is detected, and sends it to the central processing unit side as a key code; The normal output of the viewing condition judgment circuit is cyclically sent as a strobe signal to the central processing unit, and the key insertion hole is opened just before the mat shifts due to play in the binding holes and the mat is fully opened to either the left or right. In the book mat type keyboard encoder, in which the strobe signal, page code, and key code are output in the same way as in the normal state even when the inner peripheral edge is caught on the shoulder of the key button and the key button is pressed; A book mat type keyboard encoder characterized in that a data capture prohibition signal of a constant pulse width is sent to a central processing unit side only in response to the first output of a correspondingly cyclically outputted strobe signal.