Data input apparatus for microwave oven controllers

• US 4,430,540 A
• Filed: 12/28/1981
• Issued: 02/07/1984
• Est. Priority Date: 06/15/1981
• Status: Expired due to Fees

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Scalf, Gerald W.
• Primary Examiner(s): Reynolds, B. A.
• Assistant Examiner(s): Leung, Philip H.
• Application Number:
  US06/335,022
• Time in Patent Office: 771 Days
• Field of Search: 219/10.55 B, 219/10.55 R, 219/492, 219/493, 219/506, 340/365 R, 340/365 S, 340/365 C, 340/365 VL, 340/706, 340/712, 340/713, 340/753, 340/754, 307/117, 368/107, 368/108, 368/109, 368/110, 368/111, 368/112, 368/251
• US Class Current: 219/720
• CPC Class Codes: H05B 6/6452 the sensors being in contact with the heated product

Abstract

An oven controller having a microprocessor for a microwave oven has a first dial for entering time cook data in one embodiment and time or temperature cook data in other embodiments and a second dial for entering duty cycle power data. Analog signals are derived from the dials which are converted into digital signals for entering into the processor using either discrete components, separate integrated circuits or the microprocessor itself. A servo mechanism is shown in one embodiment to rotate the dials in a prescribed manner to display cook data in either time remaining or actual temperature. In other embodiments a digital display is used to provide this information.

Claims

1. Cooking data display apparatus for displaying actual cooking data for a microwave oven control having digital electronic processor means for providing an output to energize a magnetron and having a plurality of cooking data inputs to effect such output comprising

means to provide power to the processor means,

analog input means indicative of selected cooking control parameters, said analog input means including a potentiometer having a rotatable shaft,

means converting an analog signal from the analog input means to a digital signal to input to the processor means as cooking data inputs,

feedback means to effect rotation of said rotatable shaft as an indication of the fulfillment of a cooking control parameter, said feedback means including motor means coupled to the shaft to turn the shaft in either of two opposite directions,

means to energize the motor means,

the processor means including means to monitor the position of the said potentiometer shaft through the means converting an analog signal to a digital signal, and

means to compare the position of the shaft to stored cooking control parameters to energize the motor in response to said comparison to display actual cooking data.

2. Microwave oven control apparatus according to claim 1 in which the means to energize the motor means includes first and second pairs of transistors each having an output line, the processor means having first and second outputs coupled to the first and second pairs of transistors so that when the first output of the processor means is on current is conducted through the output lines in one direction and when the second output of the processor mean is on current is conducted through the output means in an opposite direction.

3. Microwave oven control apparatus according to claim 1 in which the motor means includes a permanent input magnet direct current motor.

4. Microwave oven control apparatus according to claim 2 in which the motor means includes a permanent magnet direct current motor.

5. Microwave oven control apparatus according to claim 1 in which the motor means includes a bidirectional solenoid.

6. Microwave oven control apparatus according to claim 2 in which the motor means includes a bidirectional solenoid.

7. Microwave oven control apparatus according to claim 3 in which the coupling of the motor means with the potentiometer shaft includes a slip clutch.

8. Microwave oven control apparatus according to claim 4 in which the coupling of the motor means with the potentiometer shaft includes a slip clutch.

9. Microwave oven control apparatus according to claim 5 further including a toothed member mounted on the potentiometer shaft, movable prong means adapted to engage the toothed member, the solenoid having an armature adapted to cause movement of the movable prong means upon energization of the solenoid.

10. Cooking data display apparatus according to claim 1 in which the actual cooking data displayed is time.

11. Cooking data display apparatus according to claim 1 in which the actual cooking data displayed is temperature.

12. Cooking data display apparatus for displaying actual cooking data for a microwave oven control having digital electronic processor means for providing an output to energize a magnetron and having analog to digital converter means and cooking data input means to effect the said output, comprising

means to provide power to the processor means,

a bezel,

a potentiometer coupled to the analog to digital converter means and having a shaft extending through an aperture in the bezel,

motor means coupled to the potentiometer shaft and being energizable under control of the processor means to effect rotation of said shaft,

dial means mounted on the shaft, and indicia representative of cooking data formed on the dial and bezel,

the processor means including means for determining the position of the shaft as an indication of cooking data, means for comparing said indication with stored cooking data and means to energize the motor in response to said comparison to display actual cooking data.

13. Cooking data display apparatus according to claim 12 in which the actual cooking data displayed is time.

14. Cooking data display apparatus according to claim 12 in which the actual cooking data displayed is temperature.