Control device for a cooking apparatus which controls a plurality of functions using a single resistance element

• US 4,920,253 A
• Filed: 01/05/1989
• Issued: 04/24/1990
• Est. Priority Date: 06/24/1986
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Takei, Tamotsu
• Primary Examiner(s): Paschall, M. H.
• Application Number:
  US07/293,611
• Time in Patent Office: 474 Days
• Field of Search: 219/10.55 B, 219/492, 219/497, 219/494, 219/507-509, 219/505, 307/116, 307/10.1, 307/108, 341/22, 341/151, 341/24, 341/26, 338/99, 338/92, 338/114, 338/95, 338/71, 323/904
• US Class Current: 219/506
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 2231/012 Household appliance
• CPC Class Codes: H01H 2239/012 Decoding impedances
• CPC Class Codes: H03M 11/24 using analogue means , e.g. by coding the states of multiple switches into a single multi-level analogue signal or by indicating the type of a device using the voltage level at a specific tap of a resistive divider
• CPC Class Codes: H05B 6/6435 Aspects relating to the user interface of the microwave heating apparatus

Abstract

A control device for cooking apparatus includes an input panel for inputting a desired cooking condition. The input panel includes a flexible panel on which a plurality of cooking condition set key-patterns are formed in line. When a desired cooking condition set key-pattern is pressed, the input panel produces a voltage corresponding to the pressed key-pattern. The value of this voltage is changed step by step from one side key-pattern toward the other side key-pattern on the flexible panel.

Claims

1. A control device for a cooking apparatus, comprising:

input means for allowing designation of commands of a plurality of different cooking conditions, including a plurality of manually operable contact keys;

common resistance means responsive to a manual operation of the contact keys, for generating a voltage within a defined range corresponding to one of the contact keys which has been operated, including a single, continuous resistance element, across which a voltage is applied, and an area of which is connected to produce a voltage based on which key has been operated; and

processor means responsive to the voltage from the resistance means for determining whether said voltage from said resistance means is any one of a plurality of acceptable voltages, generated by a corresponding proper depressing of said input means or an unacceptable voltage having a value between two adjacent acceptable voltages generated by an improper depressing of said input means and for recognizing one of the plurality of commands based on the acceptable voltage, the processor means overriding the unacceptable voltage from the resistance means for avoiding a false recognition of the designated command thereby.

2. A control device according to claim 1, wherein the input means includes flexible sheet means movable over a prescribed distance, the contact keys being arranged on the flexible sheet means for connecting to an area of said resistor element upon selective movement of the flexible sheet means.

3. A control device according to claim 2, wherein each of the contact keys includes a conductive material on the flexible sheet means for direct contact with the common resistance means.

4. A control device according to claim 2, wherein the input means also includes a conductive layer, and each key includes a protrusion for contacting a predetermined point on the conductive layer with the area of the resistance means upon manual operation of the key.

5. A control device according to claim 2, wherein the input means also includes a flexible conductive material on the sheet means, and the common resistance means includes an elongated plate-shaped resistor opposite to the conductive material.

6. A control device according to claim 5 also including timer means coupled to the processor means for controlling the cooking time of the apparatus.

7. A control device according to claim 5, wherein the contact keys include a timer key for inputting a desired cooking time data.

8. A control device according to claim 1, wherein the processor means A-D includes converter means for converting the voltage from the resistance means to a digital signal.

9. A control device as in claim 1 wherein said single resistance element is substantially flat and rectangular in cross-section, each said key of said input means including a conductive layer having a bottom surface which is substantially curved and is located over said respective areas of said resistance element.

10. A device as in claim 1, further comprising a wiring harness consisting of a ground wire, a power supply wire, and a control voltage wire.

14. A control device according to claim 1, wherein the cooking condition set key-patterns include a cooking time scale pattern for inputting a desired cooking time.

11. A control device for a cooking apparatus comprising:

flexible panel means for displaying a plurality of cooking condition set key-patterns thereon at respective locations thereof, a location of the panel means being moved by a prescribed distance when a desired cooking condition set key-pattern at said one of said locations is pressed to command said desired cooking condition;

common resistor means, including a single, continuous resistor element biased with a voltage at one end thereof;

movable electric conductor means responsive to said panel means being moved by said prescribed distance, for contacting an area on the resistor element in response to the press operation of the desired set key-pattern to produce a voltage based on said location which is moved;

means for converting the voltage from the resistor means to a digital signal representating said location; and

control means for determining whether said digital signal represents any one of a plurality of acceptable voltages generated by a corresponding depressing of said flexible panel means at a location corresponding to a desired cooking condition set key-pattern or represents an unacceptable voltage having a value between adjacent acceptable voltages and generated by depressing said flexible panel means at an area outside any of said desired cooking conditions, and for executing the desired cooking operation on the basis of a digital signal indicative of an acceptable voltage from the converting means, the control means overriding a digital signal indicative of an unacceptable voltage for avoiding the execution of a cooking operation other than the desired cooking operation.

12. A control device according to claim 11, wherein the electric conductors means includes a flexible elongated conductive plate for moving the prescribed distance in response to the movement of the panel means.

13. A control device according to claim 12, wherein the resistor means includes elongated resistance plate opposite to the elongated conductive plate of the conductor means.

15. A control device as in claim 11 wherein said single resistor element is substantially flat and rectangular in cross-section, said movable electric conductor means including a conductive layer having a plurality of bottom surfaces which are substantially curved and located over said respective locations of said resistor element.