JP2005265314A - Cooking apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooking apparatus capable of decreasing the cause of a failure in cooking by preventing the food from being placed in a dislocated position from the view field of a temperature sensing part and of suppressing misoperation originating from any unfamiliar person using it. <P>SOLUTION: The cooking apparatus is equipped with a heating part to heat the food in a heating chamber 9, an infrared sensor having a view field inside the heating chamber 9 and sensing the temperature in the view field, and a guide part 22 installed in the heating chamber 9 and guiding the food so that it is positioned within the view field of the temperature sensing part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooker having a temperature detection unit such as an infrared sensor and controlling the driving of a heating unit such as a magnetron or a heater according to the temperature of the temperature detection unit.

Conventionally, a heating chamber for storing food, a magnetron for supplying microwaves to the heating chamber, an infrared sensor for detecting the temperature of the food in the heating chamber, and driving the magnetron according to the detected temperature of the infrared sensor There is a well-known cooker that performs temperature detection with the infrared sensor after cooking is started and terminates when the set level is reached (see Patent Document 1). .
JP 61-149732 A

  In general, a temperature detection unit such as an infrared sensor for detecting the temperature of food stored in a heating chamber has a temperature-detectable range, that is, a visual field, and it is not possible to detect the temperature at a position outside this visual field. Is possible.

  The temperature detector is installed on the side wall or ceiling wall of the heating chamber, but the distance from the installed position to the food position at the bottom of the heating chamber is short, so the field of view of the temperature detector cannot be widened, and the entire bottom of the heating chamber Cannot be the field of view. Therefore, food placed at a position deviating from the field of view of the temperature detection unit is not subject to temperature detection, and cooking fails due to overheating.

  In addition, in the case of a cooker having a turntable in the heating chamber, if it is placed on the turntable, the food will pass through the field of view of the temperature detector by the rotation of the turntable. Can prevent. However, in the case of a cooker that does not have a turntable in the heating chamber, that is, a so-called turntableless cooker, if the food is placed at a position off the visual field of the temperature detection unit, the temperature of the food cannot be detected. Therefore, the visual field moving part is added to the visual field of the temperature detection unit to move the visual field, thereby reducing the blind spot of the temperature detection.

  However, adding a visual field moving part that moves the visual field of the temperature detection part increases the manufacturing cost, and increases the number of driving parts and the number of failure points. There is a possibility that it may not be used. Particularly in a microwave oven used in a convenience store, a hotel, or the like, that is, a commercial microwave oven, the operation time of the microwave oven affects the sales of the store, which is an important matter.

  Also, in the microwave oven for commercial use, compared to a general household microwave oven, foods of many sizes and types, such as types of bento boxes and rice balls, are heated. A cooking sequence cannot be performed, and a heating sequence for each food is required. At this time, the store clerk makes a judgment by looking at the food and pressing the cooking instruction key of the microwave oven, but depending on the sales time, the customer concentrates and becomes very busy, and the food is placed in the field of view of the temperature detection unit. Since it was not possible to confirm whether or not the food was heated, cooking failed or the cooking instruction key was pressed incorrectly, causing cooking failure.

  The present invention is intended to solve such problems.

  The cooker of the present invention includes a heating chamber for storing food, a heating unit for heating the food in the heating chamber, a temperature detection unit that has a visual field in the heating chamber, and detects the temperature in the visual field, And a guide unit that is arranged in a heating chamber and guides the food to be placed in the field of view of the temperature detection unit.

  In addition, the guide unit includes two guide rails, and the distance between the guide rails can be changed according to the width of the food around the visual field of the temperature detection unit.

  Furthermore, a control unit that performs drive control of the heating unit according to a temperature detected by the temperature detection unit, and an interval detection unit that detects an interval between the guide rails of the guide unit, the control unit includes a plurality of automatic units. An automatic cooking unit capable of executing a cooking course, an automatic cooking selection unit for selecting a cooking course executable by the automatic cooking unit according to the interval detected by the interval detection unit, and instructing the automatic cooking unit to execute It is characterized by having.

  According to the present invention, it is possible to prevent food from being placed at a position deviated from the visual field of the temperature detection unit, to reduce the cause of failure in cooking, and to prevent an operation error even if an unfamiliar user uses it. It can be suppressed.

  In FIG. 1, reference numeral 1 denotes a microwave oven, 2 is a frame which is a main body, 3 is a door disposed on the front surface of the main body 1, and 4 is a box shape provided on the lower portion of the main body 1 to support the microwave oven 1. Reference numeral 5 denotes an operation panel arranged on the front of the main body 1 and on the upper part of the door 3 for the user to input various information to the microwave oven 1. The leg 4 has an air inlet 4 a for taking cooling air into the main body 2 on the front side of the microwave oven 1. Further, an exhaust port 2c for exhausting cooling air sucked from the intake port 4a is disposed on the side surface of the main body 2.

  The operation panel 5 includes a display unit 6 that displays various information such as cooking time, and various key input units 7 for inputting cooking time, cooking menus, and the like. Moreover, the door 3 is opened and closed by rotating about the left end part as an axis. A handle 8 is provided at the right end of the door 3.

  2 and 3, 9 is a heating chamber provided in the main body 2, 10 is a resin partition plate disposed at the top of the heating chamber 9, and 11 is a ceramic food product disposed at the bottom of the heating chamber 9. The shelf, 12 is an upper waveguide having one end connected to the top surface 9a of the heating chamber 9, 13 is an upper magnetron connected to the other end of the upper waveguide 12, and 14 is connected to the bottom surface 9b of the heating chamber 9. The lower waveguide 15 is a lower magnetron connected to the other end of the lower waveguide 14, and 16 is disposed in a space between the partition plate 10 and the top surface 9 a of the heating chamber 9. An upper rotating antenna that is coupled electromagnetically and is rotatably mounted, 17 is an upper motor that rotates the upper rotating antenna 16, and 18 is disposed in a space between the food placing shelf 11 and the bottom surface 9b of the heating chamber 9. The lower part is coupled to the lower waveguide 14 in a radio wave manner and is rotatably mounted Rolling antenna, 19 is a lower motor for rotating the lower rotating antenna 18. The main body 2 has a rear plate 2a that can be removed by removing the screw 20 from the rear surface.

  Reference numeral 21 denotes an infrared sensor which is disposed at a substantially upper center portion of the rear surface 9c of the heating chamber 9, and serves as a temperature detection unit for detecting the temperature in the heating chamber 9, 22 is a guide unit for detecting the width of the food, and 23 is a detection unit An encoder 24 for converting the width of the processed food into data is a pushing member attached to the door 3 in order to push the food placed on the food placing table 11 back to a position where the temperature can be detected by the infrared sensor 21.

  In FIG. 4, the guide portion 22 includes two guide rails 22 a and 22 b that come into contact with food, and a gear portion 25 provided in the guide rail 22 a in an approximately L shape and provided with a concave and convex shape on one side. And a gear portion 26 provided on the guide rail 22b in a substantially L shape and having a saw-like unevenness on the surface facing the gear portion 25. In FIG. 4, a hatched portion 28 indicates a general visual field range of the infrared sensor 21, and 29 indicates a central portion thereof.

  Further, the encoder 23 has a pulley portion 27 that protrudes rotatably and is connected to a rotating shaft that passes through the heating chamber 9, and is fitted to the saw-like irregularities of the gear portions 25 and 26. ing. When one of the two guide rails 22 a and 22 b is moved, the other guide rail is moved in the opposite direction by the rotation of the pulley portion 27. That is, if the guide rail 22a is moved to the right, the guide rail 22b is moved to the left.

  The movement of the guide rails 22a and 22b is adjusted so that the guide rails 22a and 22b are moved in the width direction of the heating chamber 9 around the central portion 29 of the field of view of the infrared sensor 21. Even if food to be heated is placed at a position that has been removed, the food is moved to the center by operating the two guide rails 22a and 22b in order to detect the width of the food and pushed into the door 3. The member 24 pushes the food into the back side and the food to be heated is always placed in the field of view 28 of the infrared sensor 21.

  In FIG. 5, 30 is a commercial power supply, 31 is operated in conjunction with the opening and closing of the door, is opened when the door is opened, and is closed when the door is closed. 32 is the reverse operation of the door switch 31, that is, after the door switch 31 is closed. This is a monitor switch that opens and closes after the door switch 31 is opened.

  Reference numeral 33 denotes a first high voltage transformer, and 34 denotes an upper magnetron for supplying microwaves from the upper part of the heating chamber 9. The first high-voltage transformer 33 includes a primary winding 33a to which the commercial power supply 30 is connected, a secondary winding 33b for outputting a high voltage, and a heater winding 33c for heating the cathode 34a of the upper magnetron 34. It is composed of

  Reference numeral 35 denotes a first high-voltage capacitor connected in series to the secondary winding 33 b, and 36 denotes a first high-voltage diode connected in series to the first high-voltage capacitor 35.

  The first high voltage capacitor 35 and the first high voltage diode 36 constitute a half-wave voltage doubler rectifier circuit. The cathode 34a of the upper magnetron 34 is connected to the heater winding 33c of the high-voltage transformer 33 and heated, and is connected to the contact point of the first high-voltage capacitor 35 and the first high-voltage diode 36 so that a half-wave rectified voltage is generated. Supplied.

  Reference numeral 37 denotes an output adjustment relay of the upper magnetron 34 connected between the commercial power supply 30 and the primary winding 33 a of the first high-voltage transformer 33.

  Reference numeral 38 denotes a second high voltage transformer, and 39 denotes a lower magnetron for supplying microwaves from the upper part of the heating chamber 9. The second high voltage transformer 38 includes a primary winding 38a to which the commercial power supply 30 is connected, a secondary winding 38b for outputting a high voltage, and a heater winding 38c for heating the cathode 39a of the lower magnetron 39. It is composed of

  Reference numeral 40 denotes a second high voltage capacitor connected in series to the secondary winding 38c, and 41 denotes a second high voltage diode connected in series to the second high voltage capacitor 40.

  The second high voltage capacitor 40 and the second high voltage diode 41 constitute a half-wave voltage doubler rectifier circuit. The cathode 39a of the lower magnetron 39 is connected to the heater winding 38c of the second high-voltage transformer 38 and heated, and is connected to the contact point of the second high-voltage capacitor 40 and the second high-voltage diode 41, thereby half-wave rectification. Voltage is supplied.

  Reference numeral 42 denotes an output adjustment relay of the lower magnetron 39 connected between the commercial power supply 30 and the primary winding 38 a of the second high-voltage transformer 38.

  43 is a control unit for controlling the driving of the output adjustment relays 39 and 42, 44 is connected to the control unit 43, and is a non-volatile memory such as an EEPROM storing a sequence of a plurality of automatic cooking menus, and 45 is an upper magnetron. A cooling fan 46 supplies the cooling air to cool it, and a cooling fan 46 supplies the cooling air to the lower magnetron 39 to cool it.

  The control unit 43 includes an automatic cooking unit 47 that performs automatic cooking set by the key input unit 7 and an automatic cooking selection unit that selects an automatic cooking course according to the width data of the food detected by the encoder 23. doing.

  The operation in this configuration will be described with reference to FIG.

  First, in step S1, it is determined whether a cooking course has been selected from the key input unit 7. If it is determined that it is selected in this step, the process proceeds to step S2, and if it is determined that it is not selected, the process proceeds to step S3. In step S2, the selected cooking course is set, and the selection flag is set, that is, set to 1.

  In step S <b> 3, it is determined whether the guide section 22 is operated and the width of the food is detected by the encoder 23. If it is determined in this step that the guide unit 22 has been operated, the process proceeds to step S4. If it is determined that there is no operation, the process proceeds to step SS8.

  In step S4, it is determined whether the selection flag is set, that is, whether it is 1. If it is determined that it is set in this step, since an automatic cooking course is set manually from the key input unit 7 in step S2, the operation shifts to step S5 to display operation invalidity, and the flow shifts to step S8. On the other hand, if it is determined in step S5 that the selection flag is not set, the process proceeds to step S6 and the control unit 43 captures data from the encoder 23, and responds based on the food width data captured in step S7. An automatic cooking course is set in the automatic cooking unit 47.

  In step S8, it is determined whether or not the cancel key of the key input unit 7 has been operated to cancel the setting contents. If it is determined that it has been operated, the process proceeds to step S9, and the contents of the automatic cooking unit 47 are canceled.

  In step S10, it is determined whether a start operation has been performed. In step S11, it is confirmed whether or not a course is set in the automatic cooking unit 47. If it is confirmed that the course is not set, the start operation is invalid, so that the process proceeds to step S12 to display a start operation invalid display on the display unit 13 and returns to step S1. If it is confirmed in step S11 that the course is selected, the process proceeds to step S13.

  In step S13, the cooking operation is performed according to the sequence of the automatic cooking course in which the automatic cooking unit 47 is set. In step S14, it is determined whether or not the cooking operation in step S13 has been completed. If it is determined that the process has been completed in step S14, the process proceeds to step S15, where the display unit 6 is notified of the completion, the user is notified of the completion of cooking, and the cooking operation is terminated. Thereafter, the process returns to step S1 and waits until the next cooking operation.

It is an external appearance perspective view of the microwave oven of this invention. It is AA sectional drawing in FIG. It is the top view which removed the back plate of the microwave oven and was seen from back. It is an external appearance perspective view when the door of the microwave oven of this invention is open | released. It is a control block diagram of the microwave oven of the present invention. It is an operation | movement flowchart of the microwave oven of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Microwave oven 2 Main body 9 Heating chamber 13 Upper magnetron 15 Lower magnetron 22 Guide part 22a, 22b Guide rail 23 Encoder 43 Control part 47 Automatic cooking part 48 Automatic cooking selection part

Claims (3)

  A heating chamber for storing food; a heating unit for heating the food in the heating chamber; a temperature detection unit for detecting a temperature in the heating field; A cooking device comprising: a guide portion that guides food to be placed within a field of view of the temperature detection portion.   The said guide part has two guide rails, The space | interval of the said guide rail can be changed according to the width | variety of the said food centering on the visual field of the said temperature detection part, The cooker of Claim 1 characterized by the above-mentioned. .   A control unit that performs drive control of the heating unit according to a temperature detected by the temperature detection unit; and an interval detection unit that detects an interval between guide rails of the guide unit, and the control unit includes a plurality of automatic cooking courses. An automatic cooking unit capable of executing, and an automatic cooking selection unit that selects a cooking course executable by the automatic cooking unit according to the interval detected by the interval detection unit, and instructs the automatic cooking unit to execute. A cooker characterized by having.

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