JPS636323A - Cooker - Google Patents

Abstract

PURPOSE:To reduce the area of a control circuit substrate through simplification of the wiring of the substrate, by a method wherein, a control part is pressed, a conductor is deformed and forced into contact with a resistor, and a voltage corresponding to the contact position is converted into a digital signal, which is inputted as a cooking condition. CONSTITUTION:By pressing a position, corresponding to a desired cooking mode, of the positions of a cooking condition set part 5, a conductor 11 is forced into contact with a resistor 12 to produce a voltage V0. The voltage V0 is converted into a digital signal by means of an A/D converter 23 to supply the signal to a control part 20. The control part 20 inputs the value of the digital signal as a cooking mode, and a heating control circuit 21 is controlled according to the cooking mode. Namely, since a key matrix circuit is eliminated, the wiring of a control circuit substrate where the control part 20 is situated can be simplified, and this simplification enables decrease in the control circuit substrate areas and reduction in a cost.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a cooking appliance such as a microwave oven.

(Prior Art) Generally, a cooking device such as a microwave oven is provided with an operation panel on the front of the main body, and the operation panel is provided with a large number of keys for setting cooking conditions. These keys pass through the operation panel and are arranged on a control circuit board on the back side of the operation panel, and constitute a key matrix circuit on the control circuit board. In addition, the control circuit board is provided with a control unit that controls the entire microwave oven, and a large number of signal lines (digit signal lines) are arranged from the control unit to the key matrix circuit, and further from the key matrix circuit to the key matrix circuit. A large number of signal lines are provided to the control section.

By the way, in such a microwave oven, a large number of keys are arranged on the control circuit board, so a large area control circuit board must be used, which causes the problem of increasing the size of the entire microwave oven. be.

To deal with this, it is conceivable to replace the keys on the operation panel with a tablet-type keyboard, thereby eliminating the need for arranging the keys on the control circuit board. However, even if the key arrangement is no longer necessary, the key matrix circuit is still configured on the control circuit board, which means that many signal lines are arranged on the control circuit board. III
There are difficulties in shrinking circuit boards.

(Problems to be solved by the invention) This invention was made in view of the above circumstances.
The purpose of this is to enable reliable setting of cooking conditions without using a key matrix circuit, which simplifies the wiring of the control circuit board and reduces the area of the control circuit board, making it more compact. The purpose of the present invention is to provide an excellent cooking device that enables cost reduction.

[Configuration of the Invention (Means for Solving the Problems) A conductor that deforms due to a pressing force on an operating part, a resistor that is provided facing the conductor at a distance and to which a predetermined voltage is applied, and a resistor of the resistor. It consists of an analog/digital converter that converts the voltage generated between one end and the conductor into a digital signal, and means for taking in the output of the analog/digital converter as cooking conditions.

(Function) When the operating portion is pressed, the conductor deforms and contacts the resistor, and a voltage corresponding to the contact position is generated between one end of the resistor and the conductor. This voltage is converted into a digital signal by an analog/digital converter and taken in as a cooking condition.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 4, reference numeral 1 denotes a main body of the microwave oven, on the front of which a door 2 is pivotally supported so as to be freely openable and closable, and an operation panel 3 serving as an operation section is provided. A heating chamber (not shown) is provided in the main body 1 corresponding to the door 2, and the operation panel 3 has a digital display section 4. Cooking condition setting section 5. A timer knob 6 is provided.

The cooking condition setting section 5 has a longitudinal shape extending from the top to the bottom of the operation panel 3, and has a configuration shown in FIGS. 1 and 2. That is, the cooking condition setting section 5 is connected to the sheet 10 buried so as to be flush with the operation panel 3.
, a conductor 11 attached to the back side of this sheet 10, a resistor 12 provided at a distance and opposite to this conductor 11, and a conductive pattern 13 for applying a DC voltage (■) to this resistor 12.
It consists of etc. The sheet 10 is flexible,
A large number of pressing positions A, B, . . . Z for setting cooking conditions, cooking mode setting, cooking start, etc. are displayed in a pattern on the surface. The conductor 11 is elastic and plate-shaped.
When the sheet 10 is pressed, it deforms in response to the pressing force. Note that a terminal 14 is connected to the conductor 11.

That is, when the sheet 10 is pressed, the conductor 11 deforms and contacts the resistor 12 as shown in FIG. A voltage Vo is generated between the two.

FIG. 5 shows the control circuit.

Reference numeral 20 denotes a control section consisting of a microcomputer and its peripheral circuits, and this control section 20 includes the digital display section 4.
．． b0 thermal control circuit 21. Timer 22. An analog/digital converter (hereinafter abbreviated as A/D converter) 23 and the like are connected. The heating side circuit 21 has a magnetron that supplies high-frequency radio waves into the heating chamber, and controls the magnetron in accordance with commands from the control unit 20.

The A/D converter 23 converts the output (voltage VO) of the cooking condition setting section 5 into a digital signal and supplies it to the control section 23.

Next, the operation in the above configuration will be explained.

When cooking, the user presses a position corresponding to a desired cooking mode among the positions of the cooking condition setting section 5, and further presses a position corresponding to a cooking start command. Then, the conductor 11 comes into contact with the resistor 12, and a voltage vIl is generated. This voltage Va becomes higher in level as the pressed position is closer to position A. And the voltage Vo is A
/D converter 23 converts it into a digital signal, and the controller 2
0.

Here, there is a relationship shown in FIG. 6 between the pressed position and the value of the digital signal.

The control unit 20 takes in the value of the digital signal supplied from the A/D converter 23 as a cooking mode (including a cooking start command), and controls the heating control circuit 21 accordingly.

In this way, the voltage V at the level corresponding to the pressing position
o is obtained, A/D converted, and taken in as the cooking conditions, so it is possible to reliably set the cooking conditions without using a conventional key matrix circuit. That is, since a key matrix circuit is not required, the wiring of the 1111 circuit board on which the control section 20 is located can be simplified, thereby reducing the area and cost of the control circuit board. Since the area of the control circuit board can be reduced, the overall shape of the microwave oven can be reduced.

In addition, in the above embodiment, the operation panel 3 is provided with a flexible sheet.
10 was buried and the conductor 11 was attached to the sheet 10. However, as shown in FIG.
may be arranged in sequence at predetermined intervals, and the conductor 11 may be arranged between them 111i. In this case, when pressing the operation panel 3, the protrusion 3a makes point contact with the conductor 11, so there is an advantage that setting accuracy is improved.

Moreover, although the case has been described in which the cooking condition setting section 5 has a longitudinal shape along the operation panel 3, there is no limitation to the shape, and it may be appropriately spaced according to the arrangement of components on the operation panel 3.

[Effects of the Invention] As described above, according to the present invention, there are provided a conductor that deforms due to the pressure applied to the operating section, a resistor that is provided facing the conductor at a distance and to which a predetermined voltage is applied, and the resistor. Since an analog/digital converter for converting the voltage generated between one end and the conductor into a digital signal and a means for taking in the output of this analog/digital converter as cooking conditions are provided, a key matrix circuit can be used. This is an excellent cooking device that allows you to set cooking conditions reliably without having to worry about anything, and this simplifies the wiring of the control circuit board and reduces the area of the control circuit board, making it possible to downsize and reduce costs. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of main parts in an embodiment of the present invention, Fig. 2 is a diagram of a cross section taken along the line A-A in Fig. 1, viewed in the direction of the arrow, and Fig. 3 is a diagram showing the configuration of Fig. 1 in the electrical direction. Diagram shown as a circuit, No. 4
The figure is an external perspective view of the embodiment, FIG. 5 is a diagram showing the configuration of the control circuit of the embodiment, FIG. 6 is a diagram for explaining the operation of the embodiment, and FIG. 7 is the diagram of the embodiment. It is a figure showing the composition of a modification. 3... Operation panel (operation unit), 5... Cooking condition setting unit, 10... Sheet, 11... Conductor, 12... Resistor, 20... Control unit. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 1 Figure 3 Figure 4 Pressure 7rX0:,:°Cine Figure 6

Claims (1)

[Claims] A conductor that deforms due to pressure applied to the operating part, a resistor that is placed opposite to the conductor and to which a predetermined voltage is applied, and converts the voltage generated between one end of the resistor and the conductor into a digital signal. 1. A cooking appliance comprising: an analog/digital converter for converting the analog/digital converter; and means for taking in the output of the analog/digital converter as cooking conditions.