JPH09112910A - Display device and cooking apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce current consumption of a light emitting diode for digital indication of a specified number, residual cooking time and the like. SOLUTION: Digit signals are outputted in a pulse from respective digit output ports so that a digit output port at which the digit signals 50 and 51 move to a high level at each 1ms shifts to another digit output port and segment signals 52-59 are outputted in a pulse in such a manner that each of segments desired to emit light is energized once at any 1ms in 16 times of action involved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention displays a predetermined number (for example, remaining cooking time) or letters on a light emitting diode.
The present invention relates to a display device and a cooking device.

[0002]

2. Description of the Related Art A display device G mounted on a battery-powered cooking device (not shown) has segments a to h as shown in FIG.
LEDs arranged in a "Sun." shape
, Digit output ports 40, 41 for outputting digit signals 50, 51, microcomputer 7 having segment output ports 42-49 for outputting segment signals 52-59, and LED driving for dynamically displaying predetermined numbers or characters As shown in FIG. 10, the microcomputer 7 includes a circuit 62 and a light emitting diode 18 for displaying the tens place and a light emitting diode 1 for displaying the ones place.
9 and 9 emit light alternately (every 5 ms), and segments a, b, which are necessary for expressing a predetermined number (for example, “26.”),
The timings of the digit signals 50 and 51 and the segment signals 52 to 59 are determined so that g, e, d (or a, f, e, d, c, g, h) emit light simultaneously. For example,
"26." which means 26 minutes was performed at the timing shown in FIG.

[0003]

As a result of a trial test of a battery-type cooking device in which the above-mentioned conventional display device is assembled, the inventors have found that the current consumption is large and the battery life is short. For example, in the case of expressing the number "88", since seven segments are lit at the same time, the consumption current is 70 mA at 10 mA × 7. An object of the present invention is to provide a display device and a cooking device in which a current consumption of a light emitting diode for digitally displaying a predetermined number, a remaining cooking time, etc. is reduced.

[0004]

In order to solve the above-mentioned problems,
The present invention employs the following configuration. (1) A light emitting diode composed of m segments, a microcomputer having m segment output ports for outputting segment signals, a predetermined segment is energized based on the segment signal, and a number or a character is displayed. In a display device having a drive circuit for displaying,
The microcomputer outputs each segment signal in a pulsed manner so that each of the predetermined segments is energized once during any one (1 / m) equally divided time obtained by equally dividing one cycle time into m. Yes, the one-cycle time was set within the afterimage-enabled time.

(2) n (where n ≧ 2) light emitting diodes in which m segments are arranged and anodes or cathodes at the same position are connected to each other, and n digit output ports for outputting digit signals , A microcomputer having m segment output ports for outputting segment signals, and a drive circuit for energizing a predetermined segment based on the segment signal and the digit signal to dynamically display an n-digit number or character In the display device, the microcomputer is configured such that the segments necessary for displaying the n-digit number or character with the n light-emitting diodes are each energized once within one cycle time, Each digit signal and each segment signal are output as a pulse, and the one-cycle time is the afterimageable time. And the inner.

(3) n (where n ≧ 2) light-emitting diodes, in which m segments are arranged, and anodes or cathodes at the same position are connected to each other, and n number of which outputs a digit signal A microcomputer having a digit output port and m segment output ports for outputting a segment signal; and energizing a predetermined segment based on the segment signal and the digit signal,
In a display device having a drive circuit for dynamically displaying an n-digit number or character, the microcomputer divides one round time into (m × n) equally {1 / (m × n)}
The digit signal is pulse-output from each digit output port so that the digit output port in which the digit signal becomes high level moves to another digit output port at equal time intervals, and any one of (m × n) times { 1 / (m × n)}
Each segment signal is pulsed so that each of the predetermined segments is energized once during an equal time period, and the one-cycle time is set within the afterimageable time.

(4) The configuration described in any one of (1) to (3) above is adopted, and the high level time of each segment signal is increased or decreased to adjust the brightness of the light emitting diode. (5) The configuration according to any one of (1) to (4) above,
The one-cycle time is 30 ms or less.

(6) The display device has the structure described in any one of (1) to (5) above, and the operating power source of the display device is a battery.

(7) Heating means for heating an object to be cooked and a cooking container, and the remaining cooking time is reduced from an initial value in accordance with the passage of time, and when the remaining cooking time becomes zero, the heating means operates. In a cooking device having a control means for stopping, the display device according to any one of (1) to (6) above is assembled, and the remaining cooking time is displayed on the light emitting diode.

[0010]

Actions and effects of the present invention

[Operation of Claim 1] The light emitting diode has a total of m segments. The microcomputer energizes each of the predetermined segments once during any one (1 / m) equal time obtained by equally dividing one cycle time (within the afterimageable time) by the total number of segments (m). In this way, each segment signal is pulsed to the drive circuit. As a result, each of the predetermined segments emits light once during the (1 / m) equal time period, and the emission of all of the predetermined segments completes during the one-cycle time. Recognize numbers or letters.

[Effect of Claim 1] Since only one segment is energized at a time, only a maximum of current for one segment flows at the same time, and the current consumption of the light emitting diode can be reduced.

[Operation of Claim 2] Since dynamic display is performed, the anodes or cathodes of the n light emitting diodes at the same position are electrically connected to each other. There are a total of (m ×
There are n) segments.

The microcomputer pulses each segment signal so that the segments required to display an n-digit number or letter with n light-emitting diodes are each energized once within one cycle time. Output. As a result, each of the predetermined segments emits light once within one round time, and the light emission of all the predetermined segments completes during one round time, and afterimage phenomenon causes the user to
Recognize a given number or letter.

[Effect of Claim 2] Since only one segment is energized at a time, only a current for one segment flows at maximum, and the current consumption of the light emitting diode can be reduced.

[Operation of Claim 3] Since dynamic display is performed, the anodes or cathodes of the n light emitting diodes at the same position are electrically connected to each other. There are a total of (m ×
There are n) segments.

In the microcomputer, the digit signal is set to a high level every {1 / (m × n)} equal time obtained by equally dividing one round time (within the afterimageable time) by the total number of segments (m × n). The digit signal is pulse-output from each digit output port to the drive circuit so that the digit output port moves to another digit output port (m × n)
During any {1 / (m × n)} equal time of one of the times, each segment signal is pulsed to the drive circuit so that each of the predetermined segments is energized once. This gives {1 /
(M × n)} Each of the given segments is 1 during the equal time
The light is emitted twice, and the light emission of all the predetermined segments is completed within one round time. Due to the afterimage phenomenon, the user recognizes an n-digit number or character on the light emitting diode.

[Effect of Claim 3] Since only one segment is energized at a time, only a current for one segment flows at the maximum, and the current consumption of the light emitting diode can be reduced.

[Operation and Effect of Claim 4] The brightness of the light emitting diode can be adjusted by increasing or decreasing the high level time of the segment signal. [Operation and Effect of Claim 5] If the round trip time is 30 ms or less, it is possible to display numbers and characters on the light emitting diode without causing flicker.

[Operation and effect of claim 6] Since the current consumption of the light emitting diode is small, the life of the battery can be extended. [Operation and effect of claim 7] The cooking device is economical because it does not require frequent replacement of the battery because the light emitting diode consumes less current.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention (Claim 2,
3 and 5 to 7) will be described with reference to FIGS.
As shown in the figure, the gas table A has gas stoves 1, 2,
Grill 3 and indicator 4 for displaying grill timer time etc.
And a piezoelectric buzzer 5 that sounds at the end of cooking, and an indicator 4
A control unit 6 for controlling the piezoelectric buzzer 5 and the like, a dry battery 60, and tact switches 8 and 9 are provided.

The gas stove 1 is an H burner (4100 kc).
al) 11 and the H burner 11 is supplied with gas by a gas supply pipe 10 provided with a gas amount control valve (not shown) and a safety valve 12, and is ignited by a spark discharge of an ignition electrode 16. To burn. In addition, gas stove 1
Is provided with a thermistor 17 that suppresses the bottom of the cooking container n.

The valve opening of the gas amount control valve changes depending on the position of the lever 13 provided on the front upper part to increase or decrease the gas amount supplied to the H burner 11. The safety valve 12
When the point / fire extinguishing button 14 is pushed to the position shown in FIG. 3, the valve opening is started. When the electromotive force of the thermocouple 15 is higher than the ignition detection level (2.8 mV), the safety valve 12 maintains the valve open even if the point / fire button 14 is released and returned to the position shown in FIG. To do.

The gas stove 2 is an M burner (2300 kc).
gas is supplied to the M burner 21 by a gas supply pipe 20 having a gas amount control valve (not shown) and a safety valve 22 and is ignited by a spark discharge of an ignition electrode 26. To burn. The valve opening degree of the gas amount control valve changes depending on the position of the lever 23 provided on the front upper part, and the amount of gas supplied to the M burner 21 is increased or decreased. The safety valve 22 starts opening when the point / fire extinguishing button 24 is pushed to the position shown in FIG. When the electromotive force of the thermocouple 25 is equal to or higher than the valve opening maintaining level, the safety valve 22 maintains the valve opening even if the point / fire extinguishing button 24 is released and returns to the position shown in FIG.

The grill 3 has grill burners 31, 32 (each 1950 kcal) for grilling the fish f on both sides. The grill burners 31, 32 are provided with a gas amount control valve (not shown) and a safety valve 33. Gas is supplied from the gas supply pipe 30 and is ignited by the spark discharge of the ignition electrode 38 to burn. The valve opening of the gas amount control valve changes depending on the positions of the levers 34 and 35 provided on the front upper part to increase or decrease the amount of gas supplied to the grill burners 31 and 32. The safety valve 33 starts opening when the point / fire extinguishing button 36 is pushed to the position shown in FIG. When the electromotive force of the thermocouple 37 is higher than the ignition detection level (2.5 mV), the safety valve 33 remains open even if the point / fire button 36 is released and returned to the position shown in FIG. To do.

As shown in FIG. 4, the control unit 6 has a microcomputer 7, an LED drive circuit 62, a buzzer drive circuit 63, a battery voltage monitoring circuit 64, etc., and micro switches 611 and 612, a thermistor 17, a grill timer. The safety valves 12, 33, the piezoelectric buzzer 5, the battery replacement notification lamp 65, and the indicator 4 are controlled based on signals from the tact switches 8 and 9 (see FIG. 2) for time increase / decrease and the thermocouples 15 and 37. .

Microcomputer 7 of control unit 6
The indicator 4 whose emission is controlled by the LED drive circuit 62 is an LED, and displays the remaining time of the grill timer in minutes or seconds while the grill burners 31 and 32 are burning. Specifically, when ignition is detected by the thermocouple 37, “8.” is flashed and displayed for 5 seconds. Then, after 5 seconds have passed, 1 minute has passed while the “8” is lit and the colon “.” Is blinking at 1-second intervals (0.5 second on-0.5 second off) as shown below. The number display is reduced every time. Note that the countdown of the grill timer starts when the ignition is detected. 8. → 7. → 6. → 5. → 4. ...... Furthermore, 30 seconds before the end of the grill timer, the colon is turned off and the display is "1." as shown below.
Change from "30" to "30" and decrease the number display every 1 second. 2. → 1. → 30 → 29 → 28 → 27 → 26 …… → 1 →
0

Here, the display device D assembled to the gas table A (adopting the structure of claims 2, 3, 5, and 6) is
A description will be given based on FIG. The display device D is composed of the light emitting diodes 18 and 19, the LED drive circuit 62, and the microcomputer 7.

In the light emitting diodes 18 and 19, a total of eight segments a to h are arranged in a "Sun." shape, and the segments a to g (anode side) of the light emitting diode 18 and the segments a to g of the light emitting diode 19 are arranged. (Anode side) is connected.

The LED drive circuit 62 is composed of a transistor and a digital transistor, and has a digit signal 50,
This is a well-known drive circuit that dynamically displays the light emitting diodes 18 and 19 based on 51 and the segment signals 52 to 59.

The microcomputer 7 has digit output ports 40, 4 for outputting digit signals 50, 51.
1 and segment output ports 42 to 49 for outputting segment signals 52 to 59.

In this embodiment, the microcomputer 7
Is a digit output port 4 so that the high-level state is switched every 1 ms, which is obtained by dividing one round time (16 ms) into 16 equal parts.
Digit signals 50 and 51 are output as pulses from 0 and 41. This digit signal 50 is generated by the light emitting diode 1
The digit signal 51 is a signal for selecting 8 and the digit signal 51 is a signal for selecting the light emitting diode 19.

At the same time, the microcomputer 7
The segment signals 52 to 59 are pulse-outputted from the segment output ports 42 to 49 so that each of the predetermined segments is energized once every 1 ms. Therefore, when a certain segment signal is output, at this time, only the segment corresponding to the segment signal of the light emitting diode selected by the digit signal is turned on. For example, when displaying "26.", the microcomputer 7 displays the segment signals 52 to 59 as shown in FIG.
Pulse output.

Microcomputer 7 of control unit 6
The piezoelectric buzzer 5 whose ringing is controlled by the buzzer drive circuit 63 has a current consumption of about 40 mA when ringing,
It sounds when the fire extinguishing buttons 14, 24, 36 are pressed (100 ms ringing) or when the grill timer expires (1.5s ringing every 60 seconds).

The point / fire extinguishing buttons 14, 24, 36 are in the positions shown in FIG. 3 in the extinguishing state, and when pushed inward from the positions, the igniter actuating microswitches 651-65.
3 is turned on, the igniter 66 is activated, and a high voltage is applied to the ignition electrodes 16, 26, 38. When the point / fire extinguishing buttons 14 and 36 are pushed further from the position shown in FIG. 3, the micro switches 611 and 612 for supplying battery power to the control unit 6 are turned on.

When the point / fire extinguishing buttons 14, 24 and 36 are pushed all the way in (position shown in FIG. 3) and the hand is released, they stop at the position. When extinguishing the fire, push it to the position again and release it to return to the fire extinguishing position (position). still,
Such an operation is performed by a conventionally known heart cam mechanism.

The dry battery 60 is a single type manganese battery.
They are connected in series, and display 4, piezoelectric buzzer 5,
It stores electric power for operating the control unit 6.

The tact switches 8 and 9 are normally open push button switches, and the microcomputer 7 processes the pressing operation according to the following specifications. [Tact Switch 8 (Plus Key)] Each time it is pressed, the grill timer is incremented by 1 minute (maximum 15 minutes). Pressing during the seconds display sets the grill timer to 1 minute.

[Tact Switch 9 (Minus Key)] 1
Each time it is pressed, the grill timer is decremented by 1 minute (minimum 1 minute). The pressing operation when the grill timer is less than 1 minute is ignored.

Next, advantages of the gas table A in which the display device D is assembled will be described. [A] Even if any number is displayed on the display 4, 1
At each time of 1 ms, which is 6 ms divided into 16 equal parts, only one segment is energized at a time.
Only the current for one segment (10 mA) flows, and the current consumption of the display 4 can be reduced. Since the average current consumption of the display 4 is 10 mA or less, the gas table A
The overall current consumption is reduced, and the life of the dry battery 60 can be extended.

[A] Segments required to display a predetermined number or character on the light emitting diodes 18 and 19 are
Since the light is sequentially emitted so as to make one cycle in 6 ms, the divided light emission of the display unit 4 looks like a predetermined number or character due to the afterimage effect, and the user does not feel flicker.

[C] The energization time during which the transistor or the digital transistor of the LED drive circuit 62 supplies the current to the segment is as short as 1 ms or 2 ms (conventionally 5 ms), and the energization stop time during which no current is supplied is 14 ms or 15 ms (conventionally 5 ms). ), The load on the digital transistor etc. is reduced (it is advantageous for reducing heat generation and preventing failures). In addition, it is possible to use a low-standard LED drive circuit to save parts cost.

Next, a second embodiment of the present invention (claims 2 to 3)
7) will be described with reference to FIGS. A display device E mounted on the gas table B (claims 2, 3,
5) and 6) are different from the display device D in the following configurations. In the daytime, as shown in FIG. 6, since the energization time of one segment is 1 ms, the light emission time is 1 ms.
At night, the high level time of the segment signals 52 to 59 is reduced by a brightness changeover switch or cds, and as shown in FIG. 7, the energization time is set to 0.6 ms to reduce the brightness. The high level time of the segment signals 52 to 59 may be continuously increased or decreased.

The gas table B of this embodiment can further reduce the current consumption of the display 4 when the brightness is reduced.
The life of the dry battery 60 can be further extended. At night, the visibility is not reduced even if the brightness of the display 4 is reduced.

Next, a third embodiment of the present invention (claim 3,
(Corresponding to 5 to 7) will be described with reference to FIGS. 1 to 5, 8 and 9. Display device F assembled on gas table C
Is different from the display device D in the following configuration.

In the present embodiment, the energization time to one segment is 1 ms, and the number of segments required to display a predetermined number or character × 1 ms is one cycle time.
Then, the microcomputer 7 determines that the segment necessary for displaying a predetermined number or character is within one cycle time.
Digit signals 50 and 5 so that each is energized once
1 and each segment signal 52 to 59 are output as a pulse.

Specifically, when "11." is displayed,
The microcomputer 7 has the digit signals 50 and 51, the segment signals 54 and 57, and the pattern shown in FIG.
59 is pulse output. When displaying "26.", the microcomputer 7 uses the pattern shown in FIG.
59 is pulse output.

Next, the advantages of the gas table C in which the display device F is assembled are shown below. [D] When displaying any number on the display 4, 1
At each time of ms, only one segment is energized at a time, so the current for one segment (10m
Only A) flows, and the current consumption of the display 4 can be reduced. Since the average current consumption of the display unit 4 is 10 mA or less, the total current consumption of the gas table C is reduced, and the dry battery 6
The life of 0 can be extended.

[E] Since the segments required to display a predetermined number or character on the light emitting diodes 18 and 19 are sequentially made to emit light in a cycle of at most 15 ms or less, they are used due to the afterimage effect. The person can see the divided light emission of the display device 4 as predetermined numbers and dots, and does not feel flicker.

(F) Since the transistor or digital transistor of the LED drive circuit 62 supplies a current to the segment for a short time of 1 ms or 2 ms (conventionally 5 ms),
The load on the digital transistor etc. is reduced (effective for reducing heat generation and preventing failures). In addition, it is possible to use a low-standard LED drive circuit to save parts cost.

The present invention includes the following embodiments in addition to the above embodiments. a. If you do not need to display for more than 9 minutes, use gas table A
The light emitting diodes 18 and 19 of the
The microcomputer 7 may pulse the segment signals so that each segment to be emitted is energized once in any 1 ms obtained by dividing s (one cycle time) into eight equal parts (claim). 1).

B. If the number of the light emitting diodes installed side by side is up to three, the cycle time does not become long and flicker does not matter (claims 2 and 3).

C. In the above embodiment, the brightness of the light emitting diode is adjusted by increasing or decreasing the high level time of each segment, but the brightness may be adjusted by increasing or decreasing the period of the segment signal or the high level time.

D. In the above-mentioned embodiment, the display device displays the remaining cooking time, but it may display a numeral such as a set temperature, or may display characters such as alphabets.

E. Note that the one-cycle time is not limited to the above example, and the inventors of the present application have confirmed by tests that flicker due to an afterimage can be prevented if it is 30 ms or less.

[Brief description of the drawings]

FIG. 1 is a front view of a gas table according to first to third embodiments of the present invention.

FIG. 2 is a structural explanatory view of a gas table according to first to third embodiments of the present invention.

FIG. 3 is an explanatory diagram of a point / fire extinguishing switch of the gas table according to the first to third embodiments of the present invention.

FIG. 4 is a block diagram of a gas table according to first to third embodiments of the present invention.

FIG. 5 is an explanatory diagram of a display device assembled to the gas table according to the first to third embodiments of the present invention.

FIG. 6 is a waveform diagram of a digit signal and a segment signal output by the display device assembled to the gas table according to the first embodiment of the present invention.

FIG. 7 is a waveform diagram of a digit signal and a segment signal output by the display device assembled to the gas table according to the second embodiment of the present invention.

FIG. 8 is a waveform diagram of a digit signal and a segment signal output by the display device assembled to the gas table according to the third embodiment of the present invention.

FIG. 9 is a waveform diagram of a digit signal and a segment signal output by the display device assembled to the gas table according to the third embodiment of the present invention.

FIG. 10 is a waveform diagram of a digit signal and a segment signal output by a display device assembled to a gas table according to the related art.

[Explanation of symbols]

 6 Control Unit 7 Microcomputer 11 H Burner (Heating Means) 18, 19 Light Emitting Diode 21 M Burner (Heating Means) 40, 41 Digit Output Port 42-49 Segment Output Port 50, 51 Digit Signal 52-59 Segment Signal 62 LED Drive Circuit A to C Cooking device D to F Display device a to h Segment f Fish (object to be cooked) n Cooking container

Claims (7)

[Claims] 1. A light emitting diode composed of m segments, a microcomputer having m segment output ports for outputting segment signals, a predetermined segment is energized based on the segment signals, or a numeral or In a display device having a drive circuit for displaying characters, the microcomputer is configured such that each of the predetermined segments is energized once during any one (1 / m) equal time period obtained by equally dividing one cycle time into m. As described above, each display device outputs each segment signal as a pulse, and the one-cycle time is within an afterimageable time. 2. An array of m segments, wherein n or more anodes or cathodes at the same position are connected to each other (however,
(n ≧ 2) light emitting diodes, n digit output ports for outputting digit signals, and m segment output ports for outputting segment signals, and a predetermined microcomputer based on the segment signals and the digit signals. And a drive circuit for dynamically displaying an n-digit number or a character in order to display the n-digit number or the character with the n light-emitting diodes. The required segment is a pulse output of each digit signal and each segment signal so that each segment is energized once within one cycle time, and the one cycle time is set within the afterimageable time. Display device. 3. N (where n ≧ 2) light-emitting diodes, in which m segments are arranged and anodes or cathodes at the same position are connected to each other, and n digits are provided to output digit signals. A microcomputer having an output port and m segment output ports for outputting segment signals, and a drive circuit for energizing a predetermined segment based on the segment signal and the digit signal to dynamically display an n-digit number or character In the display device having the above, the microcomputer is configured such that a digit output port in which a digit signal becomes a high level is different every {1 / (m × n)} equal time obtained by equally dividing one round time into (m × n). To move to the digit output port of
A digit signal is output as a pulse from each digit output port, and each of the predetermined segments is energized once during any {1 / (m × n)} equal time period of (m × n) times. A display device, which outputs each segment signal as a pulse, and the one-cycle time is within an afterimageable time. 4. The display device according to claim 1, wherein the brightness of the light emitting diode is adjusted by increasing or decreasing the high level time of each segment signal. 5. The display device according to claim 1, wherein the one-cycle time is 30 ms or less. 6. The display device according to claim 1, wherein a power source for operating the display device is a battery. 7. A heating means for heating an object to be cooked or a cooking container, and the remaining cooking time is reduced from an initial value according to the passage of time, and when the remaining cooking time becomes zero, the operation of the heating means is stopped. A cooking device having a control means for stopping, wherein the display device according to any one of claims 1 to 6 is assembled, and the remaining cooking time is displayed on the light emitting diode.