JP3055257B2 - Rice cooker control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker control circuit.

[0002]

2. Description of the Related Art In recent years, the importance of quality in home electric appliances has been re-recognized, particularly in response to movements such as the establishment of the PL law.

FIG. 4A shows a normal state of display on a liquid crystal display element 11 (hereinafter, LCD) in a control circuit of a conventional rice cooker, in which an arrow indicating a current time and a menu are displayed. Then, a full input display as shown in FIG. 4B is performed by a special input such as multiple key presses, and it is confirmed whether the control pins of the LCD 11 are connected to the circuit.

[0004]

However, in the above-described conventional test, even if it is possible to confirm whether the control pins of the LCD 11 are connected to the circuit, it is possible to detect a defect that the control pins of the LCD 11 are in contact with each other. There was a problem that it could not be done.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a control circuit of a rice cooker of higher quality which can perform a test capable of detecting contact between control pins of an LCD.

[0006]

In order to achieve the above object, a control circuit for a rice cooker according to the present invention comprises a plurality of control pins, each of which controls turning on and off of each part of a display unit. Display means, display control means for controlling the display means, and the display control means so as to alternately emit a light-on / off signal to each control pin to check whether each control pin is in contact with each other. And input means for starting and ending the operation of the test means.

[0007]

According to the present invention, the control pin of the display means alternately emits a signal for turning on and off, so that if the control pin is in contact, the portion which should have been turned off is turned on. This makes it possible to easily detect a short circuit between the control pins of the display means.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an AC power supply, and 2 denotes a power supply circuit, which supplies a DC voltage to the circuit. Reference numeral 3 denotes a menu key for selecting a menu, reference numeral 4 denotes a reservation key used when making a reservation, and reference numeral 5 denotes a rice cooking key used when starting rice cooking. 6 is an LCD which is a display means, and 7 is an LCD which controls the LCD 6.
The control means 8 is a test means for alternately transmitting a light-on / off signal to each control pin of the LCD 6. It is assumed that the LCD control means 7 and the test means 8 are built in the microcomputer 9.

Next, the relationship between each display portion of the LCD 6 and each control pin will be described. First, FIG. 2B shows a state when the LCD 6 is fully lit. The table in FIG. 3A shows the relationship between each control pin of the LCD 6 and each part of the display unit of the LCD 6. This table shows that pin 0 is LC
It shows that the lighting / extinguishing of the "current", "reserved", and "error" portions of D6 is controlled. Similarly, the first pin controls arrows indicating "am", "pm", and "white rice". Symbols such as 3f, 3e, and 4bc appearing in this table are as shown in FIG.
Indicates an hour digit, 2 indicates a 10-minute digit, 1 indicates a minute digit, and so on, and alphabetic characters indicate which part of each number. For example, "3f" indicates the upper left f of the hour digit of the time.

The operation of the rice cooker control circuit constructed as described above will be described. Normally, the LCD 6 only displays an arrow indicating a time and a menu as shown in FIG. However, menu key 3, reservation key 4, rice cooking key 5
While the three keys are simultaneously pressed, the test means 8 detects the simultaneous press and controls the LCD control means 7 to
The output of each control pin of the CD 6 is alternately turned on and off. Explaining based on the table of FIG.
The “current”, “reserved”, and “error” portions of the CD 6 are turned off, and the first pin is turned on with arrows indicating “am”, “pm”, and “white rice”. The second pin is the hour digit “f” of the time,
The "e" portion and the 10-hour time digit are turned off, and the third pin turns on the "a", "g" and "d" portions of the time digit. The result of turning on and off in this way is shown in FIG. Then, when the key is released, the display returns as shown in FIG. 2A and returns to the normal state.

As described above, by turning on and off signals to the respective control pins of the LCD 6 alternately, a portion that should have been turned off is turned on if the adjacent control pin is in contact with the control pin. Of the control pin can be detected.

In this embodiment, the simultaneous pressing of the keys is used to enter the test state, but the input of another input port may be used. Also, this time pin 0 is turned off, 1
Although the pin number is turned on, it is needless to say that the order may be changed such that the pin number 0 is turned on and the pin number 1 is turned off.

[0014]

As described above, according to the present invention, by causing the control pins of the display means to alternately output a signal for turning on and off, a portion which should have been turned off if the control pin which has become contacted is contacted. It turns on and short-circuits between control pins of the display means can be easily detected, so that a better quality rice cooker control circuit can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control circuit of a rice cooker according to an embodiment of the present invention.

FIG. 2A is a front view of a display unit in a normal state according to an embodiment of the present invention. FIG. 2B is a front view of a display unit at full lighting in an embodiment of the present invention. Front view of the display unit at the time of alternate lighting in

3A is a diagram showing a relationship between an LCD and control pins according to an embodiment of the present invention. FIG. 3B is an explanatory diagram of a time display.

FIG. 4A is a front view of a display unit in a conventional example at a normal time. FIG. 4B is a front view of a display unit in a conventional example at full lighting.

[Explanation of symbols]

 3 menu key (input means) 4 reservation key (input means) 5 rice cooking key (input means) 6 LCD (display means) 7 LCD control means 8 test means 9 microcomputer

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaru Kawabe 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Masami Sakaguchi 1006 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-262191 (JP, A) JP-A-4-204992 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/00 G09G 3/00

Claims (1)

(57) [Claims] 1. A display means having a plurality of control pins, each of which controls turning on and off of each part of a display unit, a display control means for controlling the display means, and each control pin being in contact with each other. A rice cooker comprising test means for controlling the display control means so as to alternately emit signals for turning on and off the respective control pins in order to check whether or not the operation has been performed; and input means for starting and ending the operation of the test means Control circuit.