JPS6011774B2 - Cooker temperature display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature display device for a cooking appliance such as a microwave oven, which has a built-in temperature control function, and displays the control temperature, detected temperature, etc. of the cooking appliance.

In recent years, mainly in the United States, microwave ovens have three built-in thermistors called temperature probes in addition to the probe (metal tube), which are inserted into the object to be heated to directly detect and display the temperature of the object to be cooked. Control methods are becoming popular and developing. Displaying the temperature of the object to be heated so that the user can see it on the outside of the device has the advantage that the user can control the cooking as appropriate while viewing the temperature display. Conventionally, as a display method for this purpose, there is a meter-type display that moves the pointer as shown in Figure 1, but this makes it difficult to make the scale uniform, suffers from poor accuracy, and ``the display itself is bulky.'' In recent years, with the spread of microcomputers, methods to directly display numbers have become popular, but since they are numerical displays, they are difficult to use.

It is difficult to understand the current temperature as a practical information, and if you try to display both to understand the relationship between the set temperature and the current food filling, the number of displayed digits will double, making it difficult to understand the cost. In addition, in order to understand the relationship between the current temperature and the set value, there is a drawback that it is necessary to calculate the numerical values in the head. This calculation was made to eliminate these drawbacks, and the temperature display process was digitized.
In addition to improving accuracy, the display itself is analog, and by displaying the current temperature and set temperature on the same display element, we have made it possible to easily grasp the correlation between the two temperatures at a low cost and in an easy-to-read manner. It is what was done.

A detailed description will be given below with reference to the drawings.

FIG. 2 is a diagram showing a display example of a display section incorporating the present invention.

In the figure, 1 is a temperature scale number, and 2 is a bar-shaped light emitting part that indicates the temperature, one of which is provided for each time during quantization to digitize the temperature. In the example of FIG. 2, the case of quantized Chinese egC is shown. The diagonal lines in the figure indicate the parts that emit light, and the part 2-2 is a bar-shaped display that shows the temperature of the heated object, and the bar-shaped light-emitting part 2-1 is the part that shows the set temperature. . In this way, the present invention displays the temperature of the heated object in a polar graph in one light-emitting display element, and displays the set value in a bar-like or dot-like light-emitting pattern, thereby displaying the set value and the set value in one display element. Since the current temperature can be displayed at the same time and the relationship between both temperatures can be grasped at a glance, it becomes possible to display temperature information that is extremely effective in cooking at a low cost and in an easy-to-understand manner.

Next, an embodiment of the present invention that enables such display will be described using FIGS. 3, 4, and 5. In FIG. 3, reference numeral 3 denotes a display section according to the present invention, and in this figure, one bar-shaped light emitting section is shown at 2.degree.

Reference numerals 4, 5, and 6 are digit selection drivers for this display section, and are shown in an example in which eight bar-shaped light emitting sections are provided for each digit.

8 is a digit selection signal generating circuit, and 7 is a decoding circuit that decodes the signal from this generating circuit 8 and generates a pulse with a time difference for each digit.

1 is a control circuit that synchronizes the river digit selection signal and the data signal at that time according to the content to be displayed; 9 is a data generation circuit;

Normally, the data generation circuit 9 is constituted by a memory such as a ROM, and in the case of the present invention, data 1 is stored for each address as shown in FIG. That is, A, ~A5 are address input parts, and the output for this address is 0, ~0.
Corresponding to 8, 0 to 08 are connected one-to-one to the bar-shaped light emitting portions of the respective digits. Reference numeral 11 denotes a DA conversion circuit that generates an analog voltage according to the address signal generated by the control circuit.

A comparator 12 constantly compares the voltage obtained by increasing the voltage of the voltage dividing circuit of the temperature probe 14 and the resistor 15 with an intensifier, and the voltage from the D/A conversion circuit 11.

The control circuit 10' sequentially generates binary codes corresponding to the minimum value to the maximum value of the temperature display range for B,~Horse, and analyzes the code via the DA conversion circuit 11 each time a code is generated.

Convert it to the current value and compare it with the detection signal from the temperature probe side. The output of the comparator 12 is then
B~ when it is fed back to the loop circuit 10 and the output polarity is reversed
If the code output of & is converted to the light emitting code of the bar-shaped light emitting section and displayed, the current temperature will be displayed. That is, when the control circuit 10 detects the inversion of the output signal of the comparator 12, it sends a chip select signal to the data circuit 9, and then sends an address signal corresponding to the temperature to B~&, and synchronizes with the digit signal. 8 and 7.

In the case of the figure, first, when the control circuit 10 detects the inverted signal of the comparator blade 2, it sends a code of 11100 to B and ~B5, respectively, and the data generation circuit 9 uses this as an address and sends it to 0, ~Q. 111 each
A code of 11110 is generated.

If a digit selection signal is generated in the driver 4 at the same time, the current temperature will be displayed. If it spans multiple digits, first A, ~
Send 00010 to 0. It is sufficient to generate 11111111 from ~08 to generate a digit signal for the digit that lights up all the bars, and then light up the remaining digits and the code in the area a in FIG. 4. Next, the setting value is displayed, but this is the control circuit 1
When input to 0, only one bar in the data 1 generation circuit 9 is displayed using data 1 which causes light to emit light.

That is, the data can be displayed in the same way by selecting the data in area b in FIG. 4 and selecting the digit according to the input temperature at that time.
In the example of FIG. 3, first, from the data generation circuit, 0000
Generate the code 0001 to ○, ~08, respectively,
At the same time, a digit signal can be given to the driver 5 for display.

It is clear that if the set value and current temperature are displayed alternately on the same display element at high speed, it will appear to the human eye that the set value and current temperature are displayed at the same time. .

This situation is shown in FIG.

That is, if A is the timing of this temperature display, the mouth is displayed during the current temperature detection display period, C is the set value display period, and so on. Furthermore, since a microcomputer is usually used in the control circuit, current temperature detection can be performed extremely quickly and at low cost.

This invention has been described above through one embodiment, but by introducing this invention, temperature detection processing and display are all digitalized, so accuracy is greatly improved, and the display itself is Since the temperature can be displayed in the form of a camphor graph and the set temperature in the form of dots within the same light-emitting element, the correlation between the two temperatures can be easily grasped, making it an inexpensive temperature display device for microwave ovens that utilize microcomputers. It has the advantage of being able to provide a method that is much superior in terms of accuracy and ease of viewing.

It is obvious that this device is effective not only for microwave ovens but also for cooking appliances such as ovens.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of a slave, FIG. 2 is a principle diagram of this invention, and FIG. 3 is a circuit diagram showing an embodiment of this invention.
FIG. 4 is a diagram showing a configuration example of a data generating circuit in this embodiment, and FIG. 5 is a timing diagram for explaining the present invention. In the figure, 3 is a display section, 4, 6, and 6 are digit selection drivers, 7 is a decoding circuit, 8 is a digit selection signal generation circuit, 9 is a data generation circuit, 10 is a control circuit, and 11 is a D
-A conversion circuit, 12 is a comparator, 13 is an intensifier, 1
4 is a temperature profile, and 15 is a resistance. Number 7, number 2, number 3, number 4, number 5

Claims (1)

[Claims] 1. An element that detects the temperature of a heated object or a temperature related thereto, and a binary code that is sequentially generated in correspondence with the temperature detected by this element and the minimum value to the maximum value of the temperature display range. A comparator that inverts the polarity of the output when the detected temperature is high by comparing it with the analog conversion value, and a comparator that moves the light emitting position in a bar graph shape according to the temperature rise of the heated object or its related temperature, and a set temperature. a display unit having one digit for every predetermined number of display elements that display dot-like display elements, means for decoding a digit selection signal of the display element and sending pulses with a time difference for each digit to the display unit, and the display unit. A data generation section that generates data for the element; when the polarity of the output of the comparator is reversed, it generates the above binary code for the temperature at that time, and also sends the address of the bar graph display of each digit for that temperature to the data generation section. At the same time, a control circuit is provided which sends a current digit selection signal to the above means to display the currently measured temperature on the display section, and when the set temperature is input, causes the data generating section to display the data in a dotted manner on the display section. Temperature display device for heating cooker. 2. The temperature display device for a heating cooker according to claim 1, wherein the display timing of the heated temperature or a temperature related thereto and the display timing of the set temperature are alternately performed.