JPS58105292A - Resonance frequency generation system for piezo-electric buzzer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] This invention provides a small electronic calculator that uses a piezoelectric buzzer;
The present invention relates to a piezoelectric buzzer resonance frequency signal generation method for effectively driving an EE piezoelectric buzzer in electronic watches and the like.

Piezoelectric buzzers are used in a variety of small electronic devices, such as electronic clocks that emit a sound using an alarm buzzer.

By the way, each piezoelectric buzzer generally has its own conjugate shoulder wave number that allows it to emit sound at the maximum sound pressure. In the case of an electronic clock, etc., it is desirable that the sound volume at the alarm setting time be high, and for this purpose, it is necessary to drive the piezoelectric buzzer used in the electronic clock with its own resonant frequency signal. There is.

On the other hand, L8, which is generally shared by several models of electronic watches, etc.
I (Large-Scale Integrated Circuit) fIX#@- is used, but there are many cases in which 111EE electric buzzers with different shapes must be used for different models.However, the common shoulder wave number of the piezoelectric buzzer varies depending on its shape, and in general, when the radius of the diaphragm r1 and the thickness of the piezoelectric buzzer are d, the common wave number f changes in proportion to d/r. Since the conventional L8I is designed to generate only a frequency signal of 1a[Il for driving a piezoelectric buzzer,
The piezoelectric buzzers that can be used with the L8I are limited to one type of piezoelectric buzzer whose resonance wave number matches the frequency signal generated by the LSI, and if any other piezoelectric buzzer is used, the volume will inevitably decrease. This is both dangerous and dangerous.

The present invention has been made in view of the above-mentioned points, and its purpose is to select one or more of a plurality of types of frequency signals and generate a piezoelectric material based on the selected frequency signal. By generating a resonant frequency signal that matches the resonant wave number of the buzzer, usable piezoelectric buzzers are not limited to 1. An object of the present invention is to provide a piezoelectric buzzer resonance shoulder wave number signal generation method that can be driven by pressure.

The present invention will be specifically described below based on an embodiment shown in the drawings. Figure 1 is a circuit configuration diagram of a small electronic calculator to which this invention is applied. 1 in Figure 1 is an L8I (Large Scale Integrated Circuit), and this LSIIK is connected to the key input unit 2 and the display via a predetermined external terminal. 1118 and piezoelectric buzzer 4 are connected. This key human power @ 8 is a small electronic calculation I
A specific key, which will be described later, is provided at #1 of various keys such as a normal numeric keypad and function keys provided in the IK. Then, the key operation signal output from the central human power section is given to the ROM (read only memory) address section 6 in %Lal1, causing the address data for ROMI to be output from the ROM address [S6]. This ROM stores various microinstructions that control various operations of the small electronic computer, and R
According to the address designation by the OM address section 6, the microinstructions AD and IN8%NA are output, respectively. This microinstruction AD is a signal that is output to the RAM (random access memory) 7 and specifies the address of the RAM 7, and is O.

The microinstructions INS are various command signals output to the instruction decoder 8.
The instruction NA is RO output to the ROM address section 6.
This is the MII next address designation signal. RAM? is composed of arithmetic registers (not shown) such as X register, Y register, 2 register, etc. arranged in the row direction, and machine registers such as time register, alarm time memory register B, etc. The selection of each of these registers and their digits is executed by the microinstruction ADK, and each control of reading and writing is performed by the read/write command signal R/Written output from the instruction decoder 8.
Executed by WK. Instruction decoder 8
decodes the microinstruction INS and generates various command signals such as the signal R/W mentioned above. Note that this instruction decoder 8 executes a decoding operation based on the tie signal generated and output from the tie signal generator 9.

In addition, the operation/judge@10 exchanges data with the RAM 7, executes logical operations such as normal 4II operations based on the data successively outputted from the RAM 70 specified register, and outputs the operation result data. RAM? to the specified register. Also, the calculation result J of the judge calculation is RO
M address section 6, which causes %ROMROM
The next address data from the address section 6 MB, N microinstructions, and the above operation result J are OR-added, and address data for outputting each Kashi microinstruction necessary for the next operation to be executed is provided to the ROMg.

Also, the display section 8 has RAM? The display data read from the designated register is applied via the display section m circuit llv to perform digital display.

On the other hand, among the registers of the RAM, the A register is used as a register for storing time measurement data, and the %B register is used as a register for storing alarm time data, as described above.

The timing data in Jin's λ register is 10 per second! A one-second signal (I/C) is generated from the timing signal generating section 9 for each I, and is read out and given to the calculation/judgment section 10. In this case, the 1 second signal is given to the ROM address unit 6, and the RIOM address unit 6 receives the 1 second signal and outputs address data for executing the time measurement flow program stored in the ROM 8. , is given to ROM6. In addition, the operation/judge s1G performs an addition operation of adding "+1" to the clock data in the Y register every second, obtains new clock data (current time), stores this in the A register, and adds this new clock data to the clock data in the Y register. A comparison operation is performed between the clock data and the clock time data in the B register, and it is determined whether the current time has reached the alarm time. Then, the result of the comparison operation is given to the 1% OM address section 6 as the above-mentioned operation result J. From Nire K, a microinstruction IN8 with contents depending on whether the alarm time and the current time match or do not match is outputted from the ROM@ and given to the inventory decoder 8, whereby the % frequency signal generator 1! is now ready for operation.

This frequency signal generation 1@112 is driven low by the read clock CK output from the instruction decoder 8.
The input signals to the four external terminals F1 to F4 of aI3 are continued, and the read data of the external terminals F1 to P4 is cleared by the reset signal RE outputted from the instruction decoder 8 as well. In addition, the above external terminals F1~
Each terminal of P4 is connected to a high level or a low level as required to output a desired 4-bit code. 1 In addition, the wave number signal generation s12 is the tie signal generation W69.
Among a plurality of types of frequency signals f1 to fm outputted from the circuit, one or a combination of two or more of the frequency signals is selectively generated and output according to the read data of the wiring pattern. Note that the frequency signals output from the % frequency signal generator 12 are multiple types of frequency signals set respectively for multiple types of piezoelectric buzzers with different wave numbers, that is, common wave numbers of piezoelectric buzzers with different shapes. The resonant shoulder wave number signal outputted from the shoulder wave number signal generation @is is a signal with a frequency corresponding to each of the two, and is hereinafter referred to as a colossal shoulder wave number signal.
After being inverted by the inverter 18, it is applied from the terminal of LaI3 to the other end of the piezoelectric buzzer 4 via the resistor Rs. The piezoelectric buzzer 4 is push-pull driven by signals applied to both ends of the buzzer 4 to emit an alarm sound.

Next, the details of frequency signal generation @12 will be explained with reference to Fig. 2. 16 in Fig. 1 is the external terminal F1 to F4 of %L811.
This is a 4-bit buffer corresponding to
The output data of the corresponding terminals P1 to F4 are read in synchronization with the read clock CK. Note that this read clock CK is a signal output from the instruction decoder 8 when the power is turned on. Also, buffer 16
The contents of each bit constituting is reset by the reset signal E. Note that this reset signal RE is a signal output from the instruction decoder 8 by operating the above-mentioned specifying button K provided in the key manual section 2. Therefore, each pin output of the buffer 16 is rlJ, "2", r4J, r! I.J.
is t data and is provided to the decoder 20 directly or via the corresponding inverter 16 and 19. This decoder 20 is also supplied with frequency signals 11 to fm. The decoder 2o is not directly supplied with each bit output of the buffer 18 via the inverters 16 to 19, but instead receives an m-wavenumber signal that is a combination of one or more of the frequency signals f1 to fm. It selectively outputs @raw.

Note that the decoding sO outputs one frequency signal among the frequency signals fx to fm from the 70*IK. It has 1lls and a geb which outputs a frequency signal that is a combination of two or more.

Next, the operation of the above-mentioned embodiment will be explained.The small-sized electronic calculator of this embodiment always performs a timekeeping operation. At this time, it is assumed that the alarm time, for example, 7:00 AM, is preset in the B register. The horizontal timekeeping operation of the small electronic grand total is performed as follows. That is, a 1 second signal (lsec) is output from the timing signal generator @9 every second, and is applied to the ROM address III. Therefore, the microinstructions D%IN8 and NA for executing the timer 7 are outputted from the ROM1, and the timer data stored in the A register and processed is continuously outputted to the arithmetic/judgment unit 10I.
Ic is given, this operation 4., judge Ill OK, +1 second operation is executed, new time measurement data is calculated and transferred to A register 0. Then, alarm time is read from B register.

It is compared with the new time measurement data mentioned above. This ratio 111
-v As a result, if it is not the alarm time, frequency signal generation 1lS1! is not in an operable state, and the piezoelectric buzzer 4 is not driven. Furthermore, after the above-mentioned time measurement operation is completed, the computer returns to a state in which it can perform normal calculations.

On the other hand, at the alarm time of 7:00 AM, the arithmetic operation and judgment section 10 determines whether the contents of the M register and the B register match. Therefore, R wave number signal generation 1111! becomes operational, and the piezoelectric buzzer 4 is driven in response to the wave number signal of the resonance layer "" 7a outputted from the frequency signal generator 12, and an alarm sound is emitted.

In the case of the frequency signal generator 12, the buffer 1
6, by the read clock CK which is also output from the instruction decoder 8 when the computer is powered on.
External terminals F1 to F4 of L8It are provided. Therefore, when the frequency signal generator 12 becomes operational, the decoder 20 outputs a resonant frequency signal that is a combination of one or more of the frequency signals fw to fm based on the contents KE of the buffer 16. . That is, for example, buffer 1
When the read data of the external wiring pattern at the external terminals F1 to F4 which is stored in 5 and is false is r1000J9,
One frequency signal f1 is selected by the decoder 'RO, and this frequency signal fs is used as the resonant frequency signal by the decoder! ! 0, and when "0100.J", one frequency signal fs is selected, and this frequency signal f
3 is output as a resonant frequency signal.
J's and 1! In IK, two frequency signals fg and fm are selected, and a frequency signal obtained by combining these frequency signals f and fm is output as a resonant frequency signal.
In the case of "olllJ", two frequency signals f1 and fs are selected for K, and a combination of these frequency signals f1 and fs is output as an mll times signal resonance frequency signal.

Therefore, when installing %L811 into the computer main body, the external wiring pattern of external terminals F1 to P4 should be
By setting a predetermined state in advance according to the resonant frequency of the piezoelectric buzzer 4 used, the decoder 20 outputs a resonant frequency signal having a frequency that matches the common 1tui wave number of the piezoelectric buzzer 4 used, and this resonance The piezoelectric buzzer 4 can be driven by a frequency signal, and the piezoelectric buzzer 4
can be emitted at maximum sound pressure.

Don't use the alarm function when you meet! If not,
When a ground level (low level) is applied to all of the external terminals F1 to P4, the contents of each bit of the buffer 15 become all rOJ, and the decoder 0 becomes in a state in which none of the frequency signals t1 to fmv% is output, and the alarm time is reached. 4. No alarm sound generation is obtained, i.e.
The alarm function can be set to a non-operating state by a wiring pattern of external terminals 1-Fm.

1! When the sound is being emitted, the key force 11 is
When the omitted fixed key gK11l is operated, a reset signal RB is output from the instruction decoder 8, so that the contents of each bit of the buffer 16 are forcibly reset to all rOJ.

Therefore, by operating the specific key while the alarm is sounding, the sound can be stopped.

The present invention can be applied to electronic watches with two or more functions, and can also be applied to electronic devices having a musical tone generation function, such as an electronic musical instrument that generates musical tones in response to a single operation.

I! In the above embodiment, multiple types of resonant frequency signals can be selectively generated by changing the wiring pattern of the external terminal of LaI3, but the means for selecting the resonant frequency is based on the wiring pattern of the external terminal. However, if there is a need to have a key operator perform the same function, it may be possible to perform the same function by operating the key.

As explained in detail above, this invention selects one of the plurality of harmonic signals, i.e., 2 or more, and generates a resonant frequency signal of a piezoelectric buzzer based on the selected frequency signal. Since the piezoelectric buzzer that can be used is configured to By selectively generating signals, selected piezoelectric buzzers can be driven with maximum sound pressure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a block diagram of a small electronic computer to which the invention is applied, and FIG. 2 is a circuit configuration diagram showing the frequency signal generator in detail. 4...Piezoelectric buzzer, 9...Tie-setting signal generator,
l! ...Horse wave number signal generator, F1~F4°-L8I external terminal. For patents - Hitoshi Kajio Computer Co., Ltd.

Claims (1)

[Claims] a frequency signal output means for outputting a plurality of types of frequency signals; a selection means for selecting one or more of the frequency signals output from the frequency signal output means; and a selection means for selecting one or more of the frequency signals output from the frequency signal output means; 13:1 based on frequency signal! 1. A piezoelectric buzzer resonance frequency signal generation method, comprising: resonance frequency signal selection means for selecting a resonance frequency signal that matches the common IIJ11 wave number of the buzzer.