JP2003028432A - Electronic oven and display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic oven wherein the time up to starting of oscillation of a magnetron from the supply of electric power is shortened and cooking time is decreased. SOLUTION: There are provided a door 3, a control section 13, a high voltage transformer 10 including a first wiring 10a, a second wiring 10b, and a third wiring 10c all connected with a power supply, a magnetron 12 to which high voltage is supplied from the second wiring 10b of the high voltage transformer 10, a magnetron filament 12b connected with the third wiring 10c of the high voltage transformer 10, a relay 7 (first switch) switched on following the closing of the door 3 to supply voltage to the magnetron filament 12b, and a relay 8 (second switch) controlled by the control section 13 when the starting operation for the cooking is performed after the relay 7 (first switch) is switched on, and switched on to supply high voltage to the magnetron 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven and an indicator.

[0002]

2. Description of the Related Art In a microwave oven, since the filament of the magnetron is still in a cold state even when the cooking operation is started, it takes time for the magnetron to oscillate, and the time cannot be shortened.

Further, in a display device such as a microwave oven, a technique of arranging a light emitting element for illuminating the display portion behind the display portion and performing white silk printing on a printed circuit board in order to effectively use reflected light has been proposed. is there. However, silk printing does not provide sufficient reflection and the brightness does not change much.

[0004]

SUMMARY OF THE INVENTION The present invention provides a microwave oven capable of shortening the cooking time by pressing the cooking start key of the microwave oven until the magnetron starts oscillating.

The present invention provides a display device capable of making the display portion brighter.

[0006]

A first microwave oven according to the present invention is connected to a heating chamber, a door for opening and closing the opening of the heating chamber, a control section, and a power source.
A high-voltage transformer having a winding, a second winding, and a third winding, a magnetron to which high voltage is supplied from the second winding of the high-voltage transformer, and a third winding of the high-voltage transformer provided in the magnetron. A magnetron filament to be connected, a first switch which is turned on to supply a voltage to the magnetron filament when the door is closed, and a cooking start operation performed after the first switch is turned on, A second switch which is controlled by the control unit and is turned on so as to supply a high voltage to the magnetron.

Therefore, the temperature of the filament of the magnetron can be set to a sufficient temperature by opening and closing the door in advance, so that the magnetron can oscillate immediately after the start and the cooking time can be shortened.

The second microwave oven according to the present invention is characterized in that the first switch is turned on by the control unit when the door is closed.

Therefore, the temperature of the filament of the magnetron can be brought to a sufficient temperature by opening and closing the door in advance, so that the magnetron can oscillate immediately after the start and the cooking time can be shortened.

A third microwave oven according to the present invention includes a heating chamber, a door that opens and closes an opening of the heating chamber, an operating unit, a control unit, and a first winding and a second winding connected to a power source. Wire, a high voltage transformer having a third winding, a magnetron to which high voltage is supplied from the second winding of the high voltage transformer, and a magnetron filament provided in the magnetron and connected to the third winding of the high voltage transformer. A first switch which is controlled by the control unit and is turned on so as to supply a voltage to the magnetron filament in response to a key operation for inputting cooking conditions in the operation unit, and after the first switch is turned on. There is provided a second switch which is controlled by the control unit and is turned on so as to supply a high voltage to the magnetron when a cooking start operation is performed by the operation unit.

Therefore, since the filament of the magnetron can be heated to a sufficient temperature by inputting the cooking conditions in advance, the magnetron can be oscillated immediately after the start and the cooking time can be shortened.

A fourth microwave oven according to the present invention includes a heating chamber, a door that opens and closes an opening of the heating chamber, an operation unit, a control unit, and a first winding and a second winding connected to a power source. Wire, a high voltage transformer having a third winding, a magnetron to which high voltage is supplied from the second winding of the high voltage transformer, and a magnetron filament provided in the magnetron and connected to the third winding of the high voltage transformer. A first switch which is controlled by the control unit and is turned on so as to supply a voltage to the magnetron filament in response to a key operation for closing the door and inputting cooking conditions in the operation unit; A second switch which is controlled by the control unit and is turned on so as to supply high pressure to the magnetron when the cooking start operation is performed by the operation unit after the switch is turned on. The features.

Therefore, the filament of the magnetron can be heated to a sufficient temperature by opening and closing the door and inputting the cooking conditions in advance, so that the magnetron can oscillate immediately after the start and the cooking time can be shortened.

A first display device according to the present invention comprises a display portion,
A case for holding the display unit, a printed circuit board on which the case is installed, a light emitting element provided on the printed circuit board in the case and illuminating the display unit from the rear, and the case. And a solder land which is provided on the printed circuit board so as to be located around the light emitting element in a space and which reflects and diffuses light from the light emitting element.

Therefore, the light of the light emitting element can be reflected / diffused by the solder land and the light reflected on the inner surface of the case is reflected / diffused, so that the brightness of the display section can be made uniform and brighter. .

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A microwave oven according to an embodiment of the present invention will be described with reference to the drawings. 1 is an external perspective view of a microwave oven according to the first embodiment, FIG. 2 is an enlarged view of an operating portion of the first embodiment, FIG. 3 is a circuit diagram of the first embodiment, and FIG. 4 is a first embodiment. An example flow chart, FIG. 5 is a flow chart of the second embodiment.
FIG. 6 is a flow chart of the third embodiment.
7 is a circuit diagram of the fourth embodiment, FIG. 8 is a flow chart of the fourth embodiment, and FIG. 9 is another circuit diagram corresponding to the first embodiment.

Referring to FIG. Microwave oven body 1
A door 3 for opening and closing a front opening (not shown) of the heating chamber 2 and an operation unit 4 are provided in the.

FIG. 2 is an enlarged view of the operation section 4. A start key-4a, an input key-4b for cooking, a one-touch start key-4c, and a display section 4d are provided.

The circuit diagram of the first embodiment shown in FIG. 3 will be described below.

In the circuit, the control unit 13 is connected to the AC power supply 5. The control unit 13 receives a detection signal of opening / closing of the door switch 15 which is interlocked with the opening / closing of the door 3 and a key input signal from the operation unit 4, and contacts 7 a.
Relay 7 (first switch) with a blower motor 1
8 having a contact 9a for controlling the interior lamp 8 and the interior light 19
And control. In addition, the first connected to the AC power supply 5
A high voltage transformer 10 having a winding 10a, a second winding 10b, and a third winding 10c is provided. Further, a half-wave voltage doubler rectifier circuit 11 is connected to the second winding 10b, a magnetron 12 is connected to the half-wave voltage doubler rectifier circuit 11, and a high voltage is supplied to the magnetron 12. The filament 12b of the magnetron 12 is connected to the third winding 10c of the high-voltage transformer 10. A relay 8 (second switch) having a contact 8a is connected in series between the second winding 10b and the anode 12a of the magnetron 12, and the relay 8 (second switch) is also connected to the control unit 13. Controlled by. The control unit 13 also controls the display unit 4d and the buzzer-notifying unit 16 provided on the operation unit 4 (FIG. 2).

Next, the flow chart of the first embodiment of FIG.
This will be described below. After the AC power is turned on, the opening / closing of the door switch 15 is first detected by the control unit 13 of the circuit diagram (step S1). When the closing of the door switch 15 is detected (YES in step S2), the contact 7
The relay-7 (first switch) having a is turned on (step S3). When the relay 7 (first switch) having the contact 7a is turned on, the voltage is supplied to the filament 12b of the magnetron 12, and the filament 12
The temperature of b rises. If the door switch 15 is not closed (NO in step S2), the process returns to the detection of closing of the door switch 15 (step S2). Next, the control unit 13 detects whether or not there is an input from the start key-4a or the one-touch start key-4c provided on the operation part 4 (FIG. 2) (step S4). If the start key-4a or the one-touch start key-4c is input (YES in step S4), the relay 8 (second switch) having the contact 8a is turned on (step S5). The relay-8
When the (second switch) is turned on, a high voltage is supplied to the magnetron 12 and the magnetron 12 starts oscillating. The starter key-4a or the one-touch starter key-4c
The time from pressing to the start of oscillation of the magnetron 12 is an extremely short time of about 0.5 seconds. Conventionally, it took about 3 seconds from pressing the start key to starting the magnetron oscillation. Therefore, the cooking time can be shortened. Next, it is judged whether or not cooking is completed (step S
7). If cooking is completed (YES in step S7), the relay-7 (first switch) and relay-8 (second switch) are turned off (step S7), and the processing is completed. If the cooking is not completed (NO in step S7), the cooking is continued.
The starter key-4a or one-touch starter key-4c
If there is no input (NO in step S4), the relay
It is determined whether 7 (first switch) is turned on and one minute has passed (step S6). If 1 minute has elapsed (step S6)
YES), the relay-7 (first switch) and relay
8 (second switch) is turned off (step S8).
If 1 minute has not elapsed (NO in step S6), the process returns to the flow chart after step S4.

Next, the flow chart of the second embodiment of FIG.
Only the differences from the flowchart of FIG. 4 will be described below. In the flow chart of FIG. 4, after the AC power is turned on, the control unit 13 detects the opening / closing of the door switch 15 (step S1), and detects the closing of the door switch 15 (step S2). Relay 7 having 7a
The (first switch) was turned on (step S3). In the flow chart of the second embodiment shown in FIG.
The control unit 13 detects whether or not there is an input of key-4b relating to the cooking conditions provided in step S11, and if there is an input of key-4b relating to the cooking conditions (YES in step S11).
S), relay 7 (first switch) having the contact 7a
Is turned on (step S12). Next, in FIG.
It is detected whether there is an input from the Toki-4a or the One-touch Star Toki-4c (step S4).
It is detected whether there is an input of Toki-4a (step S1).
3). These points are the differences between FIG. 5 and FIG.

Next, the flow chart of the third embodiment of FIG.
Only the differences from the flowchart of FIG. 4 will be described below. In the flow chart of FIG. 4, after the AC power is turned on, the control unit 13 detects the opening / closing of the door switch 15 (step S1), and detects the closing of the door switch 15 (step S2). Relay 7 having 7a
The (first switch) was turned on (step S3). In the flow chart of the third embodiment shown in FIG.
3, the detection of the opening and closing of the door switch 15 (step S
21) and a key relating to cooking conditions provided on the operation unit 4.
4b is detected (step S23), the door switch 15 is closed (YES in step S22), and if there is an input of key-4b relating to cooking conditions (step S23).
23), the relay 7 having the contact 7a (first
The switch is turned on (step S24).
Next, in FIG. 4, a start key-4a or a one-touch star
It is detected whether there is an input of Toki-4c (step S
4), it is detected in FIG. 6 whether there is an input from the start key-4a (step S25). These points are the differences between FIG. 6 and FIG.

Next, the circuit diagram and flow chart of the fourth embodiment will be described below with reference to FIGS. 7 and 8, respectively. The circuit diagram of FIG. 7 illustrates differences from the circuit diagram of FIG. In the circuit diagram of FIG. 3, the controller 13 controls the door switch 15
The open / close state of the relay is detected and the relay-7 (first switch) is controlled. In FIG. 7, when the door 3 is closed, the switch 6 is mechanically turned on. At the same time, the control unit 13 controls the door switch 15
Detects opening and closing of. In this circuit diagram, a voltage is supplied to the filament 12b of the magnetron 12 without passing through the control unit 13. This is the difference.

Next, the flow chart of FIG. 8 will be described below. When the AC power is turned on and the door 3 is closed (step 31), the switch 6 is turned on (step 3).
2). When the switch 6 is turned on, a voltage is supplied to the filament 12b of the magnetron 12. The magnetron 1
When a voltage is supplied to the second filament 12b, the temperature of the filament 12b rises to a sufficient temperature. At the same time when the switch 6 is turned on, the control unit 13 detects opening / closing of the door switch 15 (step 33). It is detected whether or not the door 3 is closed (step 34), and if the door 3 is closed (YES in step 34), the start key-4a or the one-touch start key-4c (FIG. 2) is input. The control unit 13 detects whether there is any (step 35). If the start key-4a or the one-touch start key-4c is input (YES in step 35), the relay 8 (second switch) having the contact 8a is turned on (step 3).
6). When the relay-8 (second switch) is turned on,
A high voltage is supplied to the magnetron 12 through the half-wave voltage doubler rectifier circuit 11, and the magnetron 12 starts oscillating and becomes a cooking start. The time from the input of the start key to the oscillation of the magnetron 12 is an extremely short time of about 0.5 seconds. Therefore, the cooking time can be shortened. Next, it is detected whether cooking is completed (step 37), and if cooking is completed (YES in step 37), the relay-8
The (second switch) is turned off, and the process ends. If there is no input from the start key-4a or the one-touch start key-4c (NO in step 34), the process returns to the previous step.

Next, the circuit diagram of FIG. 9 will be described. In the circuit diagram of FIG. 3, the filament 12 of the magnetron 12
relay-7 (first switch) for controlling the voltage supply to b
Is connected to the first winding 10a of the transformer 10,
As shown in the circuit diagram of FIG. 9, the relay 7 (first switch) may be connected between the third winding 10c of the transformer 10 and the filament 12b of the magnetron 12. Others are the same as the circuit diagram of FIG.

Next, the display device of the present invention will be described with reference to the drawings. In FIG. 10, the display unit 30 holds the liquid crystal display unit 31 with a case 33, and the case 33 is installed on a printed circuit board 36. A plurality of light emitting elements 34 are provided on the printed circuit board 36 in the case 33, and a plurality of solder lands 35 are provided around the light emitting elements 34.
Is provided. By providing a plurality of solder lands 35 around the light emitting element 34, the light from the light emitting element 34 is reflected / diffused and the light reflected from the inner surface of the case 33 is reflected / diffused to display the display portion. As the 31 backlight, the brightness can be made even and brighter.

FIG. 11 shows a display 30 of another embodiment. A diffusion sheet 32 is provided below the display unit 31, and the display unit 3
1 and the diffusion sheet 32 are held by the case 33. Others are the same as FIG. The diffusion sheet 32
Are for diffusing the backlight of the display unit 31 and for adjusting the color of the back of the display unit.

[0029]

In the microwave oven, the time from the power supply to the start of the magnetron oscillation can be shortened and the cooking time can be shortened.

In the display, the brightness of the backlight of the display unit can be made even and brighter.

[Brief description of drawings]

FIG. 1 is an external perspective view of a microwave oven according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the operation unit.

FIG. 3 is a circuit diagram of the same.

FIG. 4 is a flowchart of the same.

FIG. 5 is a flowchart of the second embodiment of the present invention.

FIG. 6 is a flowchart of the third embodiment of the present invention.

FIG. 7 is a circuit diagram of a fourth embodiment of the present invention.

FIG. 8 is a flowchart of the same.

FIG. 9 is another circuit diagram corresponding to the first embodiment.

FIG. 10 is a structural cross-sectional view of a display according to an embodiment of the present invention.

FIG. 11 is a structural cross-sectional view of a display device of another embodiment.

[Explanation of symbols]

1 Microwave oven body 3 doors 4 operation part 5 AC power supply 6 switch 7 relay (first switch) 8 relay (second switch) 10 transformers 3rd winding of 10c transformer 12 magnetron 12a Magnetron Anode 12b magnetron filament 13 Control unit 14 key input 15 door switch 30 indicator 31 Display 32 diffusion sheets 33 cases 34 Light emitting element 35 Solder land 36 Printed circuit board

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3K086 AA03 AA10 BA08 CB14 CC11                       CC20 CD06 CD16 DB02 FA02                 3L086 AA01 CA16 CB20 DA07 DA24

Claims (5)

[Claims] 1. A heating chamber, a door that opens and closes an opening of the heating chamber, a control unit, a high voltage transformer having a first winding, a second winding, and a third winding connected to a power source, and A magnetron to which a high voltage is supplied from the second winding of the high-voltage transformer, a magnetron filament provided in the magnetron and connected to the third winding of the high-voltage transformer, and the magnetron filament to the magnetron filament when the door is closed. A first switch that is turned on to supply a voltage, and a second switch that is controlled by the control unit and is turned on to supply a high voltage to the magnetron when a cooking start operation is performed after the first switch is turned on. A microwave oven equipped with a switch. 2. The microwave oven according to claim 1, wherein the first switch is turned on by the control unit when the door is closed. 3. A high voltage having a heating chamber, a door that opens and closes an opening of the heating chamber, an operation unit, a control unit, and a first winding, a second winding, and a third winding connected to a power source. A transformer, a magnetron to which high voltage is supplied from the second winding of the high-voltage transformer, a magnetron filament provided in the magnetron and connected to the third winding of the high-voltage transformer, and controlled by the controller, A first switch which is turned on so as to supply a voltage to the magnetron filament in response to a key operation for inputting cooking conditions in the operation section, and a cooking start operation in the operation section after the first switch is turned on. And a second switch that is turned on to supply high voltage to the magnetron when controlled by the controller. 4. A high voltage having a heating chamber, a door that opens and closes an opening of the heating chamber, an operation unit, a control unit, and a first winding, a second winding, and a third winding connected to a power source. A transformer, a magnetron to which high voltage is supplied from the second winding of the high-voltage transformer, a magnetron filament provided in the magnetron and connected to the third winding of the high-voltage transformer, and controlled by the controller, A first switch that is turned on to supply a voltage to the magnetron filament in response to a key operation for closing a door and inputting cooking conditions in the operation unit, and after turning on the first switch, A microwave oven, comprising: a second switch which is controlled by the control unit and is turned on to supply a high voltage to the magnetron when a cooking start operation is performed by the operation unit. 5. A display unit, a case for holding the display unit, a printed circuit board on which the case is installed, a printed circuit board provided in the case, and the display unit is rearward. Provided on the printed circuit board so as to be located around the light emitting element in the case,
A display comprising: a solder land that reflects and diffuses light from the light emitting element.