KR0184699B1 - Signalizing device for domestic electric appliance - Google Patents

Abstract

The present invention relates to a notification device for a household electrical appliance, comprising a buzzer for performing a predetermined notification operation, and when the operation of the buzzer by changing the voltage applied to the buzzer in a predetermined pattern within a predetermined time And a notification control means rate for changing the sound pressure level over time.

Description

Notification device for household appliances

1 is an electrical diagram showing an embodiment of the present invention,

2 is a flowchart showing a main routine of control contents;

3 is a flowchart showing an intermittent routine for the main routine,

4 is a schematic perspective view of a microwave oven,

5 is a diagram illustrating a state in which output voltage data applied to a piezoelectric buzzer is quantized;

6 is a diagram illustrating a state in which output voltage data applied to a piezoelectric buzzer is quantized;

7 is a diagram illustrating a state in which output voltage data applied to a piezoelectric buzzer is quantized;

8 is a diagram illustrating a state in which output voltage data applied to a piezoelectric buzzer is quantized;

9 is a diagram showing the output voltage data quantized in the piezoelectric buzzer.

* Explanation of the protection of the main parts of the drawing

1: microwave oven (household electric appliance) 4: operation panel

5 display unit 6 microcomputer (notification control means)

9: piezoelectric buzzer 11: data ROM

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a notification apparatus for a household electrical appliance, and more particularly, to a notification apparatus for a household electrical appliance equipped with a buzzer for performing a predetermined notification operation related to operation contents or operation contents.

Background Art Conventionally, in household electric equipment such as a microwave oven, a rice cooker, a washing machine, etc., it is mainstream to perform an operation for notifying the contents of the key input operation and an operation for notifying the end of operation by the sound of the piezoelectric buzzer. Specifically, for example, in a microwave oven equipped with an oven / grill function, a self-contained piezoelectric buzzer that sounds at an oscillation frequency of 2 KHz in a voltage application state is provided so that the piezoelectric buzzer is set to the following in operation or operation state of the microwave oven. As shown in the example, the device is configured to be turned on (" off " is an operation pause period.

Confirm key input ... 0.15 seconds on once

Cooking end notification ... 3 times 0.5 seconds on / 0.5 seconds off,

Notice during cooking (preheating end notification at the time of oven cooking) ... 0.5 second on / 0.5 second off five times,

Fault notification ... 7 times for 0.15 sec on / 0.15 sec off,

Incorrect use on the user side ... 7 times 0.15 sec on / 0.15 sec off

In each of the above cases, the notification sound of the period in which the piezoelectric buzzer is operated is a continuous sound that changes with time while the sound pressure level (sound volume) is constant. In addition, although a means for adjusting the volume of the notification sound is provided as necessary, the notification sound becomes a continuous sound of a constant sound pressure level even when such adjustment is performed.

In general, home appliances other than a microwave oven, for example, a rice cooker and a washing machine, are also used as an operation action of informing a piezoelectric buzzer having an oscillation frequency of about 2 KHz. For this reason, as in the prior art, in a configuration in which the notification sound by the piezoelectric buzzer is a continuous sound varying with time at a predetermined sound pressure level, when the user confirms the notification sound, it is from which household electric device the notification sound is output. Determination often becomes difficult and inconvenient in practical use.

In addition, in the conventional configuration, the contents of the plurality of types of notification operations are distinguished only by the number of repetitive operations of the piezoelectric buzzer for outputting monotonous sound at a constant frequency and a constant sound pressure level or by the short and long operation time. It is difficult to properly distinguish the contents and this also becomes inconvenient in actual use.

In addition, the notification sound is a continuous sound of a constant frequency and a constant sound pressure level, and there is no natural sound element such as fluctuation and attenuation of the sound, and therefore, the sound that is artificial or inorganic is inevitable. For this reason, some people may feel that the audible tone is annoying, and this may cause a high quality feeling of the home electric appliance which is a product.

The present invention has been made in view of the above circumstances, and its object is to make it possible to clearly check the notification contents by the buzzer, and at the same time, it is possible to completely prevent the notification sound by the buzzer from disturbing the ear. It is to provide a notification device of household electrical appliances.

The present invention is to provide a notification device to perform a predetermined notification operation to achieve the above object, in the operation of the buzzer by changing the voltage applied to the buzzer in a predetermined pattern within a predetermined time period The sound pressure level of the sound is changed over time.

In this case, the oscillation frequency of the buzzer is set within the range of 0.5 KHz to 6 KHz, and the information indicating the voltage value to which the notification control means is applied to the buzzer is changed into new information in a time in the range of 0.1 ms to 50 ms. It can be set as the configuration to make it.

The notification control means may be configured to execute a notification operation by the buzzer at least when the operation of the home electric appliance ends.

The notification control means may be configured to execute a plurality of types of notification operations in accordance with the operation of the home electric appliance and to change the pattern of change of the applied voltage to the buzzer according to the type of the notification operation thereof.

The notification control means may be configured to repeat the operation of changing the sound pressure level of the notification sound by the buzzer several times with a predetermined operation pause period.

In this case, the notification control means may execute a plurality of types of notification operations in accordance with the progress of the operation of the household electrical appliance, and at the same time, vary the time ratio between the operation period of the buzzer and the operation pause according to the type of the notification operation. good.

The notification control means may be configured to control the operation time of the buzzer to be longer than the operation pause period of the buzzer when the notification content by the buzzer is high.

The notification control means may be configured to control the operation time of the buzzer to be longer than the operation time at the time of notification operation in other cases when the urgency of the notification contents by the buzzer is high.

The notification control means repeats the operation of changing the sound pressure level of the notification sound by the buzzer with a predetermined operation pause period several times when the notification operation by the buzzer is performed at the end of the operation of the household electrical appliance. At the same time, the last operation period may be controlled to be longer than the other operation periods.

In the apparatus of the present invention, when the buzzer is operated when a predetermined notification operation is performed in a household electric appliance, the notification control means changes the applied voltage to the buzzer in a predetermined pattern within a predetermined time so as to adjust the sound pressure level of the notification sound. It will change over time. As a result, it is possible to easily distinguish between the notification sound as described above and the continuous sound varying with time according to the predetermined sound pressure level, so that the notification content can be clearly recognized. In addition, since the notification sound can be a sound including fluctuation and attenuation close to a natural sound according to the setting state of the time variation pattern of the sound pressure level, it is possible to completely prevent the alarm sound from disturbing the user's ear.

By setting the oscillation frequency of the buzzer to something within the range of 0.5KHz to 6KHz, the buzzer can be prevented from being enlarged due to the oscillation frequency being set to less than 0.5KHz, and the notification is made when the oscillation frequency is set above 6KHz. This makes it possible to prevent a situation where the sound becomes difficult to hear. In this case, the notification control means changes the voltage applied to the buzzer to information indicating a new applied voltage in sequence within the time range of 0.1 ms to 50 ms, so that the time until the sound pressure level is changed exceeds 50 ms. As a result, there is no fear that the notification sound becomes monotonous, and at the same time, it is possible to prevent a significant amount of data for generating the notification sound due to the time until the sound pressure level is changed to less than 0.1 ms.

At least, at the end of the operation of the household electrical appliance, when the notification control means executes the notification operation while changing the sound pressure level of the notification sound by the buzzer over time, the user clearly recognizes the end timing of the operation of the household electrical appliance. You can do it.

As the operation of the household electrical equipment progresses, the notification control means executes a plurality of notification operations for changing the sound pressure level of the notification sound by the buzzer over time, and at this time, the buzzer according to the type of notification operation as described above. By changing the pattern of change of the applied voltage to the user, it is possible to reliably determine the type of each notification operation on the user side.

If the notification control means repeats the operation of changing the sound pressure level of the notification sound by the buzzer over time several times with a predetermined operation pause period, the type of the notification sound can be increased, and the notification of various kinds of operation contents can be performed. It becomes possible. In addition, the characteristics of the notification sound easily appear, it is possible to confirm the notification content more clearly. In addition, the term "operation pause" here means not only a period in which no voltage is applied to the buzzer, but also a period in which a voltage is applied to the buzzer and a state in which the sound pressure level of the alarm sound is below a minimum level that can be heard by the human ear. It is a concept to include.

The notification control means changes the sound pressure level of the notification sound by the buzzer according to time, and executes a plurality of types of notification actions according to the progress of the operation of the home electric appliance, and at the same time, the operation period of the buzzer according to the type of the notification action. By changing the time ratio between the operation pauses, it is possible to more easily display the characteristics of the notification sound, and even when the notification contents are set in various kinds, the user can easily distinguish the notification contents.

When the notification control means has a high urgency of the notification content by the buzzer, the period for operating the buzzer while changing the sound pressure level with time is longer than the operation period of the buzzer. It is possible to clearly inform the user that the contents are of high urgency, which is beneficial in practical use.

When the notification control means performs the notification operation by the buzzer at the end of the operation of the household electric appliance, the operation of changing the sound pressure level of the notification sound by the buzzer over time is repeated a plurality of times with a predetermined operation pause period. At the same time, the last operation period is controlled longer than the other operation periods. Therefore, the notification sound enables the user to convey a sense that the operation of the household electrical device is terminated, thereby increasing the flexibility of the notification operation.

(Example)

EMBODIMENT OF THE INVENTION Hereinafter, one Example which applied this invention to the microwave oven is demonstrated, referring drawings.

In FIG. 4 showing the overall appearance, the microwave oven 1 as a household electric appliance is a main body case 2 including a machine room accommodating a magnetron, a fan, and the like, and a cooking chamber (none of which is shown) adjacent thereto. A door 3 for opening and closing the cooking chamber is provided on the front side, and an operation panel 4 equipped with key switches and a display portion 5 for displaying operation contents and the like are provided.

In FIG. 1 a schematic electrical configuration of the microwave oven 1 is shown. In FIG. 1, the microcomputer 6 (corresponding to the notification control means according to the present invention) supplied from the control power supply terminal + Vcc is a key input signal from the operation panel 4, a sensor provided for heating cooking ( On the basis of the sensing signal from 7) and the control program stored in advance, the display content control of the display section 5 and the operation of the load such as the magnetron through the driving circuit 8 are performed.

In addition, the microcomputer 6 is configured to control the self-contained piezoelectric buzzer 9 through the D / A conversion circuit 10, and during this control, the voltage applied to the piezoelectric buzzer 9 is stored. It is a structure which changes in the pattern based on the below-mentioned data etc. which were memorize | stored in ROM11. In addition, the piezoelectric buzzer 9 is disposed inside the operation panel 4, for example, and its oscillation frequency is set to a predetermined value in the range of 0.5 KHz to 6 KHz, for example, 2 KHz.

In addition, the clock frequency of the microcomputer 6 is set to about 4.19 MHz, for example.

The data ROM 11 includes a plurality of types of output voltage data ΔV (in the invention of claim 2) that exhibit a cleavage pattern when the voltage is applied to the piezoelectric buzzer 9 through the D / A conversion circuit 10. The corresponding information is stored in the quantized state of "information showing the voltage value applied to the buzzer". In this case, the microcomputer 6 reads the output voltage data [Delta] V by sequentially specifying the address of the ROM 11 at predetermined intervals through a data pointer (register). Further, the read period of the output voltage data ΔV is set to a predetermined time, for example, 5 ms in the range of 0.1 ms to 50 ms. Therefore, the output voltage data [Delta] V is changed into new data in order with time in the range of 0.1 ms to 50 ms.

5 to 9 show a plurality of examples of patterns of the output voltage data ΔV, which will be described below. 5 to 9, the horizontal axis shows the address indicating value of the output voltage data ΔV by the data pointer, and the vertical axis shows the output value λ (quantization value) of the output voltage data ΔV. . In addition, since the reading period of the output voltage data [Delta] V by the data pointer is set to 5 ms as described above, the horizontal axis corresponds to 5 ms per "1" division.

(a) Example of FIG.

5 shows a pattern of output voltage data ΔV applied to the piezoelectric buzzer 9 when a key input operation on the operation panel 4 is performed.

In this example, the output value [lambda] gradually increases from an intermediate level and reaches an almost maximum value after 30 ms. After that, the output value [lambda] decreases gradually after maintaining the maximum value or a value close thereto and 40 ms. After the elapse of time, the level 0 is reached.

Therefore, when the output voltage data ΔV shown in FIG. 5 is read and applied to the piezoelectric buzzer 9, the voltage applied to the piezoelectric buzzer 9 is shown in FIG. 5 within a predetermined time (170 ms). The sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed in time as described above. However, since the piezoelectric buzzer 9 does not oscillate unless the applied voltage is above a certain level, in practice, the piezoelectric buzzer is in a state where the output value λ is below a predetermined level (for example, about 40). Notification sound is not output from (9).

(b) Example of FIG. 6

FIG. 6 shows a pattern of output voltage data [Delta] V applied to the piezoelectric buzzer 9 when notification is made at a predetermined timing during cooking. In this example, the output value [lambda] increases or decreases in a relatively short period, and at the same time, the operation pause period of a predetermined time after a change pattern that gradually decreases from the state where the maximum value is shown after the envelope gradually increases (540 ms) (for example, For example, 540ms), the same change pattern as that of the change pattern is continued for 540ms, and after that, the change pattern is repeated three times continuously with a 540ms operation pause period.

Therefore, when the output voltage data ΔV shown in FIG. 6 is read and applied to the piezoelectric buzzer 9, the voltage applied to the piezoelectric buzzer 9 is shown in FIG. 6 within a predetermined time (3.78 seconds). The sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed in a pattern repeating the operation period and the operation pause period as described above. However, even in this case, the alarm sound is not output from the piezoelectric buzzer 9 in a state where the output value? Is actually below a predetermined level (for example, about "40").

(c) Example of FIG.

FIG. 7 shows a pattern of output voltage data ΔV applied to the piezoelectric buzzer 9 when a failure notification of the microwave oven 1 is performed. In this example, the output value [lambda] changes from the zero level to the pattern of returning to the zero level after 510 ms has elapsed, and the change pattern is repeated several times, for example, ten times in succession. It is supposed to be.

Therefore, when the output voltage data ΔV shown in FIG. 7 is read and applied to the piezoelectric buzzer 9, the operation of increasing or decreasing the voltage applied to the piezoelectric buzzer 9 as shown in FIG. Repeatedly, the sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed over time as in the pattern.

However, even in this case, since the alarm sound is not output from the piezoelectric buzzer 9 in a state where the output value lambda is actually below a predetermined level (for example, about "40"), the piezoelectric buzzer 9 The operation of changing the sound pressure level of the notification sound over time is repeated for a predetermined operation pause period (a period in which the output value? Is about 40 or less).

(d) Example of FIG. 8

FIG. 8 shows a pattern of output voltage data ΔV applied to the piezoelectric buzzer 9 when a notification of misuse of the microwave oven 1 is given.

In this example, the output value [lambda] is changed from a zero level to a pattern of returning to this level after 500 ms has elapsed, and then a change pause period (for example, 250 ms) The change pattern, such as the change pattern, is repeated several times, for example, seven times by narrowing the operation pause period (250 ms).

Therefore, when the output voltage data ΔV shown in FIG. 8 is read and applied to the piezoelectric buzzer 9, the operation of increasing or decreasing the voltage applied to the piezoelectric buzzer 9 as shown in FIG. This operation is repeated a plurality of times during the operation pause period, and the sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed over time as in the above pattern. However, even in this case, the alarm sound is not output from the piezoelectric buzzer 9 in a state where the output value lambda is actually below a predetermined level (for example, about "40"). Therefore, in this case, the operation pause period during which the notification sound by the piezoelectric buzzer 9 is not output is longer than during the failure notification as in (c) above.

(e) Example of FIG.

9 shows a pattern of output voltage data ΔV applied to the piezoelectric buzzer 9 when the cooking end notification (operation end notification) is performed. In this example, the output value [lambda] increases and decreases in a relatively short period, and at the same time, the operation period for a predetermined time (for example, 480 ms) after a change pattern that gradually decreases with the maximum value shown after the envelope gradually increases is continued for 480 ms. The change pattern, which is the same as the change pattern, is continued for 480 ms, and after 480 ms of the operation pause period is increased or decreased in a relatively short period, and at the same time, the change pattern gradually decreases in a state where the maximum value is shown after the parabolic gradually increases. Is supposed to continue for 1.12 seconds.

Therefore, when the output voltage data ΔV shown in FIG. 9 is read and applied to the piezoelectric buzzer 9, the voltage applied to the piezoelectric buzzer 9 is shown in FIG. 9 within a predetermined time (3.04 seconds). The sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed over time as shown in the above pattern, and is changed to a pattern which repeats the operation period and the operation pause period as described above. It becomes longer than this other operation period (1st time and 2nd time).

However, even in this case, the alarm sound is not output from the piezoelectric buzzer 9 in the state where the output value lambda is actually below a predetermined level (for example, about "40").

Incidentally, the contents of the control by the microcomputer 6 are schematically shown in FIGS. 2 and 3, which will be described together with the related operations.

In FIG. 2, the contents of the main routine are shown, and in FIG. 3, the beep output is executed by the interrupted processing of a 5 ms period (corresponding to the reading period of the output voltage data ΔV from the data ROM 11). The contents of the routine are shown.

In FIG. 2, after the power is turned on, after executing the initial setting step A1 for setting the display unit 5 or the like to a predetermined initial state, the step of setting the address indication value of the data pointer to an initial value of "1" (A2) is executed, and thereafter, it is determined whether or not the key input operation has been performed based on the key input signal from the operation panel 4 (step A3).

When the key input operation is performed, the piezoelectric buzzer 9 is executed after executing the operation content execution processing routine A4 which executes the processing (processes such as setting and canceling the cooking course and starting cooking) of the key input operation. After executing step A5 of setting the data designation flag Fa for instructing the operation of the step (1), the process proceeds to step A6 in which the fisherman determines whether the cooking operation of the microwave oven 1 is in progress. In addition, the flag Fa set in the step A5 is for operating the piezoelectric buzzer 9 with the output voltage data ΔV shown in FIG.

The determination step A6 is executed when it is determined as "No" in step A3, that is, when no key input operation is performed, and when it is determined as "YES" in this step A6. The cooking process routine A7 which continues cooking of the content set by the said operation content execution process routine A4 is executed. After that, it is determined whether or not the cooking is finished (step A8), and when it is not finished, it is determined whether or not the timing by the piezoelectric buzzer 9 is required during cooking (step A9).

In the case of the timing at which the notification by the piezoelectric buzzer 9 is required during cooking, the determination step A3 is executed after executing step A11 of setting a data designation flag Fb for instructing the operation of the piezoelectric buzzer 9. Return to In addition, the flag Fc set in the step A11 is for operating the piezoelectric buzzer 9 to the output voltage ΔV shown in FIG.

On the other hand, in each case determined as "No" in steps A6 and A9, it is determined by the preset self-diagnosis means whether or not a failure has occurred in the microwave oven 1 (step A12). If it is determined, a failure processing routine A13 for executing the operation and display corresponding to the failure is executed. Thereafter, after executing step A14 of setting the data designation flag Fd for instructing the operation of the piezoelectric buzzer 9, the process returns to the determination step A3.

The flag Fd set in the step A14 is for operating the piezoelectric buzzer 9 with the output voltage data ΔV shown in FIG.

When it is determined in step A12 that "No", that is, when it is determined that a failure does not occur, it is determined whether the misuse of the microwave oven 1 has been carried out (step A15), and when it is determined that it is misuse The implementation of the operation and display corresponding to the use executes the wrong use processing routine A16. After this, after executing step A17 of setting the data designation flag Fe for instructing the operation of the piezoelectric buzzer 9, the process returns to the determination step A3. In addition, the flag Fe set at the said step A17 is for operating the piezoelectric buzzer 9 with the output voltage data (DELTA) V shown in FIG.

On the other hand, as the notification sound output routine of FIG. 3 executed by the termination processing of the 5 ms period, it is first judged whether or not the data designation flags Fa to Fe are set (step B1), and the flags Fa to Fe are set. If it is set, the read processing routine B2 for reading the output voltage data DELTA V is executed.

In this routine B2, any of the data setting flags Fa to Fe (in the setting state) of the output voltage data ΔV shown in FIGS. 5 to 9 stored in the data ROM 11 is shown. The specified output voltage data ΔV is read from an address corresponding to the address indication value (initial value is "1") of the data pointer. That is, when the data designation flag Fa is set, the output voltage data ΔV of the pattern shown in FIG. 5 is read from the head address, and the data designation flags Fb, Fc, Fd and Fe are read. In each of the set cases, the output voltage data? V of the patterns shown in Figs. 6, 9, 7, and 8 are read out from the head address.

After execution of the read processing routine B2, the step B3 of transmitting the output voltage data ΔV read as described above to the D / A conversion circuit 10, and the address indication value of the data pointer are increased by "1". After the step B4 is executed sequentially, the address indication value is the maximum value (FIG. 5 → 35, FIG. 6 → 757, FIG. 7 → 1021, FIG. 8 → 1001). It is judged whether it has reached FIG. 9 → "609" (step B5).

At this time, if the address indication value does not reach the maximum value, it is returned as it is, but if the address indication value reaches the maximum value, the flag in the set state is a data designation flag (Fe) corresponding to the failure notification sound. That is, it is determined whether or not the failure notification is in the selected state (step B6), and when it is determined as "YES", the address value of the data pointer is set back to "1" and returned after executing step B7. If "No" is determined in step B6, the process returns after executing step B8 of resetting the data designation flag (any of Fa, Fb, Fc, and Fd) in the set state at this time.

Therefore, as a result of the above-described notification sound output routine being executed every 5 ms, the following alarm operation is performed through the piezoelectric buzzer 9 according to the type of the data designation flags Fa to Fe set in the main routine. Will be.

1) When the data designation flag Fa is set in response to a key input operation by the operation panel 4.

In this case, the output voltage data ΔV shown in FIG. 5 is applied to the piezoelectric buzzer 9 after being converted into an analog voltage through the D / A conversion circuit 10, thereby notifying the piezoelectric buzzer 9. The sound pressure level is changed over time as in the pattern shown in FIG. In this case, as described above, the application of the voltage to the piezoelectric buzzer 9 is continued for 170 ms, but in reality, the output value λ of the output voltage data ΔV becomes less than a predetermined level (about 40). At the time point, the output of the notification sound from the piezoelectric buzzer 9 is stopped.

(2) When the data designation flag Fb is set in accordance with the timing at which the notification by the piezoelectric buzzer 9 is required during cooking.

In this case, the piezoelectric buzzer 9 is notified because the output voltage data ΔV shown in FIG. 6 is applied to the piezoelectric buzzer 9 after being converted into an analog voltage through the D / A conversion circuit 10. As shown in FIG. 6, the negative sound pressure level is changed into a pattern in which the operation period that changes with time in a predetermined pattern is repeated three times by narrowing the operation pause period.

In particular, in the third operation period, the sound pressure level of the notification sound is changed by three times.

③ When data designation flag (Fc) is set at the end of cooking...

In this case, since the output voltage data ΔV shown in FIG. 9 is converted into an analog voltage through the D / A conversion circuit 10 and then applied to the piezoelectric buzzer 9, the piezoelectric buzzer 9 is notified. As shown in Fig. 9, the negative sound pressure level is changed into a pattern in which the operation period that changes with time in a predetermined pattern is read out three times by narrowing the operation pause period. In particular, in the last (third) operation period, the period in which the sound pressure level of the notification sound changes with time is controlled to be longer than other operation periods.

4) When the data designation flag (Fd) is set depending on the judgment that a failure has occurred.

In this case, the piezoelectric buzzer 9 is notified because the output voltage data ΔV shown in FIG. 7 is applied to the piezoelectric buzzer 9 after being converted into an analog voltage through the D / A conversion circuit 10. As shown in FIG. 9, the negative sound pressure level is a pattern of returning from the zero level to the zero level after "increase-> decrease-> decrease". The period in which the output value λ of (ΔV) is about 40 or less) is narrowed and changed into a repeating pattern. In particular, in this case, in step B7 of the alarm sound output routine, since the address indication value of the data pointer is set back to "1" which is the initial value, the operation of outputting the alarm sound as described above continues until the power is cut off. Will be.

(5) When the data designation flag (Fe) is set in accordance with the judgment that the microwave oven 1 is used incorrectly.

In this case, since the output voltage data ΔV shown in FIG. 8 is converted into an analog voltage through the D / A conversion circuit 10 and then applied to the piezoelectric buzzer 9, a notification by the piezoelectric buzzer 9 is performed. As shown in FIG. 8, the negative sound pressure level is a pattern of returning from the zero level to the zero level after the increase / decrease → decrease from the zero level. It will change in a repeating pattern. In particular, in this case, the operation pause period during which the notification sound by the piezoelectric buzzer 9 is not output is longer than when the data designation flag Fd is set as in the above (4).

In summary, according to the above-described configuration of the present embodiment, the following effects can be obtained.

When the notification operation by the piezoelectric buzzer 9 is performed, the applied voltage to the piezoelectric buzzer 9 is based on the output voltage data ΔV stored in the data ROM11 in advance (see FIGS. 5 to 9). By changing the sound pressure level of the notification sound according to time by changing the pattern into a preset pattern within a predetermined time, it is possible to easily distinguish between the notification sound as described above and the continuous sound that changes with time according to the predetermined sound pressure level. The notification contents can be clearly recognized on the user side. In addition, the notification sound may be a sound including fluctuations and attenuations close to natural sounds (examples of FIGS. 5, 6, and 9) according to the setting state of the time variation pattern of sound pressure level. It is possible to completely prevent annoying situations in the world.

In the case where the alarm sound is set to less than 0.5KHz, the piezoelectric buzzer 9 cannot be enlarged, and when the alarm sound is set in excess of 6KHz, it is difficult to avoid hearing sounds particularly by the elderly. In this configuration, since the oscillation frequency of the piezoelectric buzzer 9 is set to something within the range of 0.5 KHz to 6 KHz, the piezoelectric buzzer 9 can be prevented from being enlarged, and at the same time, it is possible to prevent the alarm sound from being heard. You can do it.

Since the reading period of the output voltage data ΔV from the data ROM 11 is set to a predetermined time within a range of 0.1 ms to 50 ms, for example, 5 ms, the sound pressure level changes based on the read output voltage data ΔV. When the time until the sound is longer than 50 ms, there is no fear of monotonous sound and the time until the sound pressure level is changed is less than 0.1 ms. The increase can be prevented in advance.

At the end of cooking by the microwave oven 1, the notification operation is executed while the sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed over time, so that the cooking end timing of the microwave oven 1 is made by the user. Can be recognized. In particular, upon notification of the end of cooking, the operation of changing the sound pressure level of the notification sound by the piezoelectric buzzer 9 with time has a predetermined operation pause period based on the output voltage data ΔD shown in FIG. Repeated three times and the last operation period is longer than the other operation periods, so that the notification sound can give the user the sense that the operation of the household electrical appliance is terminated, thereby increasing the flexibility of the notification operation. do.

In accordance with the progress of the cooking operation of the microwave oven 1, a plurality of notification operations for changing the sound pressure level of the notification sound by the piezoelectric buzzer 9 with time are executed, and the piezoelectric buzzer according to the type of each notification operation ( Since the change pattern of the applied voltage for 9) has a different configuration, it is possible to reliably discriminate the types of the plurality of types of notification operations on the user side.

In the case where the sound pressure level of the notification sound by the piezoelectric buzzer 9 is changed over time, when the notification, fault notification, misuse notification, and cooking end notification are performed during cooking, shown in FIGS. 6 to 9 Based on one output voltage data [Delta] V, a plurality of times are repeated for a predetermined operation pause period. Therefore, the type of the notification sound can be increased, and notification of various kinds of operation contents can be performed, and the characteristics of the notification sound can be easily displayed, and the notification contents can be confirmed more clearly.

In this case, the piezoelectric buzzer 9 may be used as a type of notification operation by the piezoelectric buzzer 9, specifically, an example of a failure notification corresponding to FIG. 7 and an incorrect usage notification corresponding to FIG. 8. The time ratio between the operation period and the operation pause is different. Therefore, the characteristics of the notification sound can be more easily displayed, so that even if a plurality of kinds of notification contents are set, the user can easily distinguish the notification contents.

If the urgency of the notification contents by the piezoelectric buzzer 9 is high, such as a failure notification, the time for operating the piezoelectric buzzer 9 while changing the sound pressure level with time as in the example of FIG. 9 is longer than the operation stop period. Since it is controlled so that it can be controlled, it can be made clear to a user that the notification content by the piezoelectric buzzer 9 as described above is high in urgency, and it is advantageous in practical use.

In addition, when the urgency of the notification content by the piezoelectric buzzer 9 is high, for example, in the case of a failure notification, the structure which continuously operates the piezoelectric buzzer 9 until the power is cut off, that is, the operation time of the piezoelectric buzzer 9 Since it is controlled to be longer than the operation time at the time of this other notification operation, this also makes it possible to reliably inform the user that the notification contents according to the operation of the piezoelectric buzzer 9 are high in urgency, which is advantageous in practical use.

In addition, the present invention is not limited to the above-described embodiment, but may be enlarged or modified as described below.

The voltage applied to the piezoelectric buzzer is controlled on the basis of the output voltage data ΔV stored in the data ROM 11, but the function expression representing the pattern of the beeping sound is stored. It is good also as a structure which performs control of an applied voltage. It is not limited to a microwave oven but can be applied to other household electrical appliances such as rice cookers and washing machines. In this case, when the oscillation frequencies of the piezoelectric buzzers are close to each other, or the same piezoelectric buzzer is used in each device, Even in this case, there is an advantage in that each electric device can be assigned a sound notification.

In addition, the piezoelectric buzzer is not limited to another type of buzzer.

According to the present invention, as apparent from the above description, the sound pressure level of the notification sound is changed over time by changing the voltage applied to the buzzer in a predetermined pattern during the notification operation by the buzzer. Therefore, it is possible to clearly recognize the notification content by the buzzer on the user side, and at the same time, it has a beneficial effect that can completely prevent the alarm sound caused by the buzzer.

In addition, when a plurality of types of notification operations are executed in accordance with the progress of the operation of the household electric appliance and a configuration in which the change pattern of the applied voltage to the buzzer is changed in accordance with the type of the notification operations is adopted, the plurality of types of notifications can be used. It is possible to reliably discriminate the type of notification operation, which is advantageous in practical use. Further, by adopting a configuration in which the operation of changing the sound pressure level of the notification sound by the buzzer over time with a predetermined operation pause period is adopted, the notification content can be further diversified.

Claims (9)

In the household electric appliance having a buzzer for performing a predetermined notification operation, the sound pressure of the notification sound by changing the voltage applied to the buzzer in a predetermined pattern within a predetermined time during the operation of the buzzer when the buzzer is operated. And a notification control means for changing the level with time. The buzzer according to claim 1, wherein the buzzer has an oscillation frequency set within a range of 0.5 KHz to 6 KHz, and the notification control means sequentially converts the information indicating the voltage value applied to the buzzer into new information at a time within the range of 0.1 ms to 50 ms. Notification device for household electrical equipment, characterized in that the configuration for changing. The notification device according to claim 2, wherein the notification control means is configured to execute a notification operation by a buzzer at least when the operation of the home electrical device is terminated. The method according to claim 1 or 2, wherein the notification control means executes a plurality of types of notification operations according to the progress of the operation of the household electrical appliance, and at the same time changes the pattern of change of the applied voltage to the buzzer according to the type of the notification operation. Notification device for household electrical equipment, characterized in that the configuration. The notification of the household electrical appliance according to claim 1, wherein the notification control means is configured to repeat the operation of changing the sound pressure level of the notification sound by the buzzer over time with a predetermined operation pause period. Device. The method of claim 5, wherein the notification control means is configured to execute a plurality of types of notification operation in accordance with the progress of the operation of the household electrical appliance, and at the same time to vary the time ratio between the operation period of the buzzer and the operation pause according to the type of the notification operation. Notification device for household electrical equipment, characterized in that the. The apparatus of claim 6, wherein the notification control means controls the operation period of the buzzer to be longer than the operation pause period of the buzzer when the notification content by the buzzer is high. The household electric appliance according to claim 6, wherein the notification control means controls the operation time of the buzzer to be longer than the operation time at the time of the notification operation in other cases when the notification content by the buzzer is high in urgency. Notification device. The method according to any one of claims 6 to 8, wherein the notification control means changes the sound pressure level of the notification sound by the buzzer according to time when the notification operation by the buzzer is performed at the end of the operation of the household electrical appliance. And repeating the operation a plurality of times with a predetermined operation pause period and controlling the operation period to be longer than the other operation periods.