JP2013054907A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker in which a light-emitting source for illuminating input keys of an operation part is arranged on the same board with other components.SOLUTION: An induction heating cooker comprises: a heating part heating a heating object placed on a top plate 2; an operation part arranged on the top plate 2 and including input keys for an input of a heat condition of the heating part; and a display part arranged on the top plate 2 and displaying contents of the input through the operation part. The operation part includes: printing 31 representing the input keys; a touch switch board 33 having capacitance change detection part 34 arranged at a location corresponding to a location of the printing 31 for detecting a capacitance change; a light-emitting element 21 located near the capacitance change detection part 34 of the touch switch board 33 and emitting light in its side face direction; a light guide body 22 provided on a top face of the capacitance change detection part 34 for bending an optical axis of light from the light-emitting element 21 at an approximately 90-degree angle to illuminate a surface printed with the printing 31; and spacers 23 for providing the light-emitting element 21 and the light guide body 22 between the top plate 2 and the touch switch board 33.

Description

  The present invention relates to an induction heating cooker in which an operation unit arranged on a top plate such as an induction heating cooker is a capacitance change detection type touch switch.

  Conventionally, in order to improve the visibility of the operation unit of the induction heating cooker, the light guide disposed below the top plate is lit to light the entire operation unit area and notify the user. . Moreover, in order to improve operability, there is a heating cooker shown in Patent Document 1 in which only an input effective operation unit emits light.

  The heating cooker shown in Patent Document 1 is composed of a light-emitting substrate provided with an operation unit and a light-emitting element, and a planar light-emitting unit composed of a light guide body in which light from the light-emitting element is bent at approximately 90 degrees in order to light the operation unit. Has been.

JP 2010-911189 A

  Conventionally, in this type of induction heating cooker, when induction heating a pan placed on the top plate, the heat of the heated pan is transmitted to the surroundings through the top plate, so the top plate near the pan The temperature of was high. For this reason, the board on which the electrical / electronic components to be mounted on the lower part of the top plate are arranged in consideration of the operating temperature range of the components. In particular, since the light-emitting element for lighting the conductor detection unit so-called operation unit shown in Patent Document 1 is provided on an independent light-emitting substrate and separated from the top plate, the component parts include the accompanying structural parts. It is very complex and requires careful work. For this reason, there is a problem that the cost of parts to be configured is also expensive.

  The present invention has been made to solve the above-described problems, and includes a main body, a top plate provided on the upper surface of the main body, and a heating unit that heats an object to be heated on the front side of the top plate. An operation unit including an input key that is arranged on the front side of the top plate and inputs a heating condition of the heating unit, and a display unit that is arranged on the top plate and displays the contents input by the operation unit, The operation unit includes a touch switch substrate provided with a capacitance change detection unit that inputs a print indicating the input key and a capacitance change at a position corresponding to the position of the print, and the touch switch substrate includes the touch switch substrate. A light emitting element that emits light in a lateral direction in the vicinity of the capacitance change detecting unit, and an optical axis of light provided from the light emitting element provided on the upper surface of the capacitance change detecting unit is bent by approximately 90 degrees to perform the printing. The light guide that illuminates the surface and the front It is obtained by a spacer for providing the light guide and the light emitting element between the top plate and the touch switch substrate.

  Further, the light emitting element disposed on the touch switch substrate is disposed on a front outer side opposite to the heating unit disposed on the main body.

  In the present invention, visibility is improved by providing a plurality of touch switches that detect capacitance changes on a single substrate and a plurality of light emitting units that match the arrangement of the touch switches. This has the advantage that the adverse effects of heat on the light emitting part can be eliminated, and the number of constituent boards and the number of structural parts that hold the boards can be reduced, making product assembly easier and reducing costs. it can.

The top view of the induction heating cooking appliance main body of one Example. The cut figure of the top plate showing the operation part of the induction heating cooking appliance of one Example. Explanatory drawing of the operation part of the induction heating cooking appliance of one Example. Sectional drawing of the operation part of the induction heating cooking appliance of one Example. Explanatory drawing of the display part which shows the operation part of the induction heating cooking appliance of one Example. Explanatory drawing which shows the pan position mounted in the induction heating cooking appliance of one Example. Explanatory drawing which shows the pan placed in the display part of the induction heating cooking appliance of one Example. Explanatory drawing which shows the pan placed in the operation part of the induction heating cooking appliance of one Example.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 is a plan view of the induction heating cooker body, as viewed from the top of the product. Reference numeral 1 denotes an induction heating cooker body, which is usually incorporated in a system kitchen (not shown) or the like. A top plate 2 made of heat-resistant glass is provided on the upper surface of the main body 1. The top plate 2 is provided with heating units 3, 4, and 5 for placing and heating a pan (FIGS. 6 to 8, 101) that is an object to be heated. An induction heating coil (not shown) corresponding to the heating units 3, 4, and 5 is provided inside the main body 1. In place of the induction heating coil corresponding to the heating unit 4, an electric resistance heating heater (not shown) may be installed.

  On the front side of the top plate 2, display units 6, 7, 8 corresponding to the heating units 3, 4, 5 respectively, and operation units 9, 10 comprising a plurality of input keys corresponding to the heating units 3, 4, 5 respectively. 11 are provided on the input keys of the operation units 9, 10, and 11, and a print 31 is printed on the top plate 2 with a design and characters representing the input in order to input heating conditions for the heating units 3, 4, and 5. It has been subjected. For the print 31, for example, in the “fire power down” switch as shown in FIG. And light is transmitted through 52 light emitting portions which are not printed. In addition, the operation units 9, 10, and 11 employ a capacitance change detection type touch switch, and the surface of the top plate 2 is provided with the above-described printing 31 so that it can be easily handled. .

  Next, the configuration of the operation units 9, 10 and 11 will be described in detail on behalf of the operation unit 9.

  The top plate 2 is printed on the front surface or the back surface of the top plate 2 so that the function of the operation unit 9 can be understood. The lower portion of the top plate 2 (inside the main body 1) is shown in FIG. As shown, a touch switch substrate 33 provided with a capacitance change detection unit 34 that detects a change in capacitance using a copper foil pattern of a printed circuit board, and the touch switch substrate 33 emits light in the lateral direction. The light guide 22 is provided between the light emitting element 21, the capacitance change detection unit 34, and the print 31 applied to the top plate 2. The light guide 22 is a surface light source that illuminates the entire printing 31 by bending the optical axis by approximately 90 degrees after the light from the light emitting element 21 is incident from the side surface i portion. In the present embodiment, “approximately 90 degrees” is assumed to be approximately 80 degrees to 100 degrees.

  In addition, a space is provided between the top plate 2 and the touch switch substrate 33 so that the light emitting element 21 and the light guide 22 are provided, and a spacer 23 is provided so that light does not leak to the adjacent touch switch. Further, the light emitted from the light guide 22 is diffused between the top plate 2 and the light guide 22 to make the light uniform, and even if a hot pan or the like is placed on the top plate 2, the light is shielded. A diffusion sheet 32 is provided. And the arrangement position of the light emitting element 21 is arranged on the outer side of the front side so as to be opposite to the positions of the heating units 3, 4, 5 arranged in the main body 1.

  The present embodiment has the above configuration, and the operation will be described next with reference to FIGS.

  FIG. 6 shows a state in which a pan 101 that is an object to be heated is placed and heated inside the heating unit 3 displayed on the top plate 2 of the main body 1.

  In order to start heating, the operation unit 9 is operated while confirming the display unit 6 provided on the front side of the top plate 2. At the time of operation, an operation key (31 copies of printing) whose input is valid is turned on or blinking by the light emitting element 21, and a key portion determined to be input is turned on so that the user can easily understand. At this time, since the pan 101 is placed inside the heating unit 3, there is no influence on the light emitting element 21 that illuminates the operation unit 9.

  FIG. 7 shows a case where the pan 101 as the article to be heated is shifted and placed over the display unit 6 from the heating unit 3 shown on the top plate 2 of the main body 1. In this case, since the display part 6 cannot be seen in order to start heating, it does not reach until it inputs from the operation part 9 and the pan 101 is heated. In order to operate the operation unit 9, it is necessary to check the display unit 6, and the user inputs the heating conditions after the pan 101 is repositioned as shown in FIG. 6.

  However, the position where the light-emitting element 21 is disposed is the position where the heating unit 3 is disposed even when the placement position of the pan 101 is shifted to the position shown in FIG. Since it arrange | positions at the outer outline side so that it may become an other side, the heat | fever of the pan 101 does not have a bad influence on the light emitting element 21. FIG.

  FIG. 8 shows a case where the pan 101 which is an object to be heated is placed on the top plate 2 of the main body 1 so as to be greatly shifted from the heating unit 3 to the display unit 6 and further to the operation unit 9. In such a case, since the operation itself cannot be performed, the pan 101 is not heated.

  If the pan 101 is displaced to the position of the operation unit 9 as shown in FIG. 8 during heating, the control unit provided in the main body 1 determines that there is no load when viewed from the heating coil provided in the heating unit 3. To stop heating. Further, the control unit detects that the capacitance of the plurality of capacitance change detecting units 34 of the operation unit 9 has been changed by the pan 101 and stops heating, or turns off the light emitting device 21 to turn off the light emitting device 21. Reduces the adverse effects of heat on

  According to the above-described embodiment, the component configuration of the operation unit is provided with a plurality of touch switches for detecting a change in capacitance and a plurality of light emitting units according to the arrangement of the touch switches. This has the advantage of eliminating the adverse effects of heat on the light emitting part while reducing the number of components, and reducing the number of constituent boards and the number of structural parts that hold the boards, making product assembly easier and reducing costs. Reduction can be achieved.

DESCRIPTION OF SYMBOLS 1 Main body 2 Top plate 3, 4, 5 Heating part 6, 7, 8 Display part 9, 10, 11 Operation part 21 Light emitting element 22 Light guide 23 Spacer 31 Printing 33 Touch switch board 34 Capacitance change detection part 52 Light emission Part 101 Nabe A Operation part 9 structure (bottom of the top plate)
A side

Claims (2)

A main body, a top plate provided on the upper surface of the main body, a heating unit for placing and heating an object to be heated on the top plate, and a heating condition of the heating unit disposed on the front side of the top plate An operation unit including input keys, and a display unit that is arranged on the front side of the top plate and displays contents input by the operation unit,
The operation unit includes a touch switch substrate provided with a capacitance change detection unit that inputs a print indicating the input key and a capacitance change at a position corresponding to the position of the print, and the touch switch substrate includes the touch switch substrate. A light emitting element that emits light in a lateral direction in the vicinity of the capacitance change detecting unit, and an optical axis of light provided from the light emitting element provided on the upper surface of the capacitance change detecting unit is bent by approximately 90 degrees to perform the printing. An induction heating cooker comprising: a light guide that illuminates a surface; and a spacer for providing the light emitting element and the light guide between the top plate and the touch switch substrate. The induction heating cooker according to claim 1,
The induction heating cooker, wherein the light emitting element disposed on the touch switch substrate is disposed on a front outer side opposite to the heating unit disposed on the main body.