KR100942569B1 - A structure of control panel for microwave oven - Google Patents

Abstract

The present invention relates to a control panel structure of a microwave oven for preventing the knob from being installed eccentrically. According to the present invention, a plurality of support side walls 216 and 218 having a plurality of fastening bosses 212, 213, 214, and 215, and supporting grooves 217 and 219 formed on the inner side of the control panel 210 in which the plurality of through holes 211 are formed. ) Is provided. A plurality of fastening holes 232, 233, 234, and 235 are formed at the rear of the control panel 210, and a PCB assembly 230 having an encoder 239 is installed at the front thereof. On the other hand, the dial knob 240 penetrating so as to form a gap between the inner periphery of the through hole 211 and protrudes outside is coupled to the encoder 239. The dial knob 240 is supported by a cylindrical guide 260 having a pair of support ribs 261 and 263 inserted into and supported by the support grooves 217 and 219 on an outer circumferential surface thereof. Therefore, when the fastening screws 252, 253, 254, 255 passing through the fastening holes 232, 233, 234, 235 are fastened to the fastening bosses 212, 213, 214, and 215, the relative positions of the dial knob 240 and the encoder 239 can be accurately installed.

Microwave Oven, Control Panel, Control Panel, PCB Assembly, Boss

Description

Structure of control panel for microwave oven

1 is an exploded perspective view showing a main portion of a typical microwave oven.

Figure 2 is a cross-sectional view showing a control panel structure according to the prior art.

Figure 3 is a cross-sectional view showing a preferred embodiment of the control panel structure according to the present invention.

4 is a plan view showing an inner side of a control panel constituting the embodiment shown in FIG.

Explanation of symbols on the main parts of the drawings

200: control panel 210: control panel

211: through hole 211a: support jaw

212,213,214,215: Fastening boss 216,218: Support side wall

217,219 support groove 220: control cover

230: PCB assembly 232,233,234,235: fastener

239: encoder 239a: axis of rotation

240: dial knob 241: body portion

243: coupling portion 245: locking jaw

252,253,254,255: Tightening screw 260: Cylindrical guide                 

261,263: support rib

The present invention relates to a control panel structure of a microwave oven, and more particularly, to a control panel structure of a microwave oven configured so that the relative position of the knob and the encoder can be accurately installed.

1 shows a typical microwave oven. As shown in the drawing, inside the cavity assembly 10 of the microwave oven, a cooking chamber 11 for heating a food using microwave or heater heat is formed, and at one side of the cavity assembly 10, a magnetron, An electrical equipment chamber 13 to which various electrical components such as a high voltage transformer is mounted is provided.

On one side of the front plate 17 forming the front surface of the cavity assembly 10, the door 15 for opening and closing the cooking chamber 11 is rotatably installed. In addition, the upper and both sides of the cavity assembly 10 are shielded by an outer case 19 which forms an upper surface and both sides of the microwave oven.

On the other hand, the control panel 100 is installed on the upper end of the front plate 17 corresponding to the upper side of the door 15. The control panel 100 receives a variety of operation signals for the operation of the microwave oven and serves to display various information during the operation of the microwave oven. The configuration of the control panel 100 is detailed in FIG. 2. Is shown.                         

As shown in the drawing, a plurality of through holes 111 through which the dial knob 140 to be described below is formed is formed at one side of the control panel 110 forming the front appearance of the control panel 100, Openings are formed so that signals of the LEDs installed in the PCB assembly 130 to be described later can be identified from the outside.

In addition, a control cover 120 is mounted on a front surface of the control panel 110 to protect the LED exposed to the outside through the opening. The control cover 120 may be generally formed of a transparent material, and is fixed to the front surface of the control panel 100 by an adhesive or the like.

In addition, on the inner surface of the control panel 110 adjacent to the through hole 111, a plurality of fastening bosses (112, 113, 114, 115) for fixing the PCB assembly 130 is provided to protrude rearward.

Meanwhile, the PCB assembly 130 is mounted at the rear of the control panel 110. A plurality of fastening holes 132, 133, 134, 135, and 136 corresponding to the fastening bosses 112, 113, 114, and 115 are formed in the PCB assembly 130, and fastening screws 152, 153, 154, 155 passing through the fastening holes 132, 133, 134, 135, and 136 are fastened to the fastening bosses 112, 113, 114, and 115. As a result, the PCB assembly 130 is mounted to the rear of the control panel 110.

In addition, the PCB assembly 130 is provided with various electrical elements including the LED for displaying the operation state of the microwave to the outside, and a plurality of encoders 139 to which operation signals for operating the microwave are input. In addition, the encoder 139 is provided with a rotating shaft 139a extending forward, and the dial knob 140 is coupled to the rotating shaft 139a.

The dial knob 140 is a place where the user grips and rotates to input an operation signal through the encoder 139. The body portion 141 is formed in a cylindrical shape with an open rear surface, and the body portion. It consists of a coupling portion 143 extending rearward from the center of the inner surface of the 141 is coupled to the rotary shaft 139a of the encoder 139.

On the other hand, the dial knob 140 is installed so that the body portion 141 projects through the through hole 111 while the coupling portion 143 is coupled to the rotation shaft 139a. In addition, the front surface of the body portion 141 is formed to have a diameter relatively smaller than that of the through hole 111, so that the dial knob 140 is formed between the outer circumferential surface of the dial knob 140 and the inner circumference of the through hole 111. ), A predetermined gap is formed to easily rotate.

Such a gap is for facilitating the rotation operation of the dial knob 140. The dial knob 140 and the through hole 111 may be penetrated through the center of the through hole 111. It is preferable that the gaps between the holes 111 have a constant width as a whole. In addition, the front end of the body portion 141, in order to prevent the dial knob 140 is removed from the front of the through hole 111, a radially extending locking jaw 145 may be formed.

Therefore, when the user rotates the dial knob 140 at a predetermined angle, the rotation shaft 139a coupled to the engaging portion 143 of the dial knob 140 is also rotated by the angle at which the dial knob 140 is rotated. Will rotate. An electrical signal is selected by the encoder 137 according to the rotation angle of the rotation shaft 139a, and the microwave oven operates according to the electrical signal.

However, the control panel structure of the microwave oven according to the prior art having such a configuration has the following problems.

Conventionally, the fastening screws 152, 153, 154, and 155 passing through the fastening holes 132, 133, 134, and 135 of the PCB assembly 130 are mounted to the fastening bosses 112, 113, 114, and 115 during the process of mounting the PCB assembly 130 to the rear of the control panel 110. In fastening to the, the fastening operation is not easy, it may not be fastened to the correct position of the PCB assembly 130.

In this way, since the PCB assembly 130 is not fastened to the correct position, the relative position of the dial knob 140 and the encoder 137 may be incorrectly installed. Therefore, one side of the outer circumferential surface of the dial knob 140 and one side of the inner circumferential side of the through hole 111 are in contact with each other, so that the rotation operation of the dial knob 140 is not easy.

The present invention is to improve the above-mentioned conventional problems, an object of the present invention is a control panel of a microwave oven is configured so that the relative position of the knob and encoder in the process of mounting the PCB assembly to the rear of the control panel can be installed accurately. To provide a structure.

According to the present invention for achieving the above object, the present invention provides a through-hole formed on one side of the front side, and a control panel having a plurality of fastening boss protruding rearward from the inner side; A PCB assembly mounted to the rear of the control panel and provided with a switch installed at a position corresponding to the through hole and a plurality of fastening holes corresponding to the fastening bosses; A knob protruding to the outside through the through hole and operating the switch; And a cylindrical guide installed between the inner surface of the control panel and the front surface of the PCB assembly to guide the knob. The cylindrical guide is formed in a cone shape having a smaller diameter at the rear end than the front end.

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The outer circumferential surface of the cylindrical guide is provided with a pair of support ribs protruding in the longitudinal direction, and a support side wall on which an inner side of the control panel adjacent to the through hole is formed is provided with a support groove protruding rearward and the support rib is inserted and supported. It is provided.

The support side wall may extend from an outer circumferential surface of the fastening boss adjacent to each other, and may have a support jaw that protrudes rearward from the inner inner circumference of the through hole and supports the inner circumferential surface front end of the cylindrical guide.

Such a control panel structure of a microwave oven according to the present invention, the knob is guided by a cylindrical guide installed between the control panel and the PCB assembly while being supported on the inner surface of the control panel, and thus the PCB assembly. In the process of mounting the rear of the control panel, there is an advantage that the relative position of the dial knob and the encoder is correctly installed.                     

Hereinafter, exemplary embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

3 shows a preferred embodiment of the control panel structure of the microwave oven according to the present invention, and FIG. 4 shows a control panel constituting the embodiment shown in FIG. As shown in the drawing, the control panel 200 installed at one side of the front of the microwave oven serves to input various operation signals for operating the microwave oven and to display various information during the operation of the microwave oven to the outside. .

In the control panel 210 forming the front appearance of the control panel 200 as described above, a plurality of through holes 211 through which the dial knob 240 to be described below is formed are formed. In addition, the control cover 220 is mounted on the front of the control panel 210.

In addition, a plurality of fastening bosses 212, 213, 214, and 215 are provided on an inner surface of the control panel 210 adjacent to the through hole 211 to fix the PCB assembly 230. The fastening bosses 212, 213, 214, and 215 protrude rearwards from the inner surface of the control panel 210. In the illustrated embodiment, a pair of fastening bosses 212, 213, 214, and 215 are respectively located vertically on both sides of the through hole 211. Is provided.

The PCB assembly 230 is mounted to the rear of the control panel 210. In the PCB assembly 230, a plurality of fastening holes 232, 233, 234, and 235 are formed in correspondence with the fastening bosses 212, 213, 214, and 215, and fastening screws 252, 253, 254, 255 passing through the fastening holes 232, 233, 234, and 235 are provided in the fastening bosses 212, 213, 214, and 215. By being fastened, the PCB assembly 230 is mounted to the rear of the control panel 210.                     

Meanwhile, various electrical elements are installed in the PCB assembly 230, and a plurality of encoders 239 are installed on the front surface corresponding to the through hole 211 of the control panel 200, respectively. The encoder 239 is a place where an operation signal for operating a microwave oven is input, and a dial knob 240 is coupled to a rotation shaft 239a extending forward.

The dial knob 240 is a rotary operation for inputting an operation signal through the encoder 239, and a body portion 241 formed in a cylindrical shape with an open rear surface thereof, and a portion of the body portion 241. It is composed of a coupling portion 243 extending rearward from the inner side center portion and coupled to the rotation shaft 239a of the encoder 239.

The dial knob 240 is configured such that the body portion 241 opens the through hole 211 in a state in which the coupling portion 243 is coupled to the rotation shaft 239a so that a user can grip and rotate the knob. It is installed to protrude to the outside through. In addition, the front surface of the body portion 241 is formed with a diameter relatively smaller than the inner circumference of the through hole 211, the outer circumferential surface of the dial knob 240 and the through hole ( A predetermined gap is formed between the inner periphery of 211).

This gap is for easily rotating the dial knob 240. The dial knob 240 and the through hole are located at the center of the through hole 211. The gap between 211 will have a constant width as a whole. In addition, in order to prevent detachment of the dial knob 240, which may occur due to the front surface of the body portion 241 being formed relatively smaller than the through hole 211, the front end of the body portion 241 extends radially. The locking step 245 is formed.                     

Therefore, when the user grips and rotates the body part 241 to rotate the dial knob 240 at a predetermined angle, the rotation shaft 239a coupled to the coupling part 243 may also be rotated by the dial knob 240. It rotates by the same angle as the rotation angle. An electrical signal is selected by the encoder 239 according to the rotation angle of the rotation shaft 239a, and the microwave oven operates according to the electrical signal.

Meanwhile, between the inner surface of the control panel 210 and the front surface of the PCB assembly 230, a plurality of cylindrical guides 260 for guiding the dial knob 240 are horizontally installed. The cylindrical guide 260 is formed in a cone shape having a smaller diameter at the rear end than the front end, and the outer peripheral surface of the locking jaw 241 of the dial knob 240 is in contact with the inner peripheral surface of the cylindrical guide 260.

Therefore, the dial knob 240 is guided by the cylindrical guide 260, and thus, the PCB assembly (2) in the process of fastening the fastening screws (252, 253, 254, 255) passing through the fastening holes (232, 233, 234, 235) to the fastening bosses (212, 213, 214, 215). By not moving the 230 in the correct position, the dial knob 240 is eccentrically positioned, it can be controlled by the cylindrical guide 260.

That is, even if the PCB assembly 230 moves in the process of fastening the fastening screws 252, 253, 254, 255 to the fastening bosses 212, 213, 214, 215, the outer circumferential surface of the locking jaw 241 is in contact with the inner circumferential surface of the cylindrical guide 260. The dial knob 240 is guided by the cylindrical guide 260 so that the dial knob 240 does not move to a position eccentrically from the center of the through hole 211.                     

In addition, due to such an eccentricity of the dial knob 240, one side of the outer circumferential surface of the dial knob 240 and one inner circumferential side of the through hole 211 may be brought into contact with each other while operating the dial knob 240. Damage to the outer circumferential surface of the dial knob 240 or the inner circumference of the through hole 211 can be prevented.

On the outer circumferential surface of the cylindrical guide 260, a pair of support ribs 261 and 263 protruding in the longitudinal direction are provided. The inner side of the control panel 210 is provided with a pair of support side walls 216 and 218 having support grooves 217 and 219 into which the support ribs 261 and 263 are inserted. That is, the cylindrical guides 260 are supported by the inner surface of the control panel 210 by inserting the support ribs 261 and 263 into the support grooves 217 and 219.

The support side walls 216 and 218 protrude rearward from the inner side of the control panel 210 and extend from one side of the outer circumferential surface of the fastening bosses 212, 213, 214 and 215 adjacent to each other. In other words, extending from one side of the outer circumferential surface of the fastening bosses 213 and 215 provided on the upper side of the fastening bosses 212, 213, 214 and 215 provided in pairs on both sides of the through hole 211, respectively, toward the outer circumferential surface of the fastening bosses 212 and 214 provided below. As a result, the support side walls 216 and 218 are formed.

In the illustrated embodiment, the support side walls 216 and 218 are formed at one side of the outer circumferential surface of the fastening bosses 213 and 215 which are provided on the upper side of the pair of fastening bosses 212, 213, 214 and 215 provided up and down on both sides of the through hole 211, respectively. It extends to the outer circumferential surface of the fastening bosses 212 and 214 provided below, but is not necessarily limited thereto.

For example, a pair of fastening bosses 212, 213, 214, and 215 are provided in the upper and lower portions of the fastening bosses 211, 213, 214, and 215, respectively, and on one side of an outer surface of the fastening bosses 214, 215 provided on the right side of the fastening bosses 212, 213, 214, and 215. The support side walls 216 and 218 may be molded by extending to the outer circumferential surfaces of the fastening bosses 212 and 213 provided on the left side.

In addition, the inner periphery of the through hole 211 is provided with a support jaw (211a) is formed to protrude to the rear. The support jaw 211a supports the cylindrical guide 260 while its outer circumferential surface is in contact with the front end of the inner circumferential surface of the cylindrical guide 260, and the tip thereof is connected to the locking jaw 245 of the dial knob 240. By supporting the tip portion, the dial knob 240 is prevented from being removed in front of the through hole 211.

Accordingly, the cylindrical guide 260 is supported by the support ribs 261 and 263 of the outer circumferential surface thereof inserted into the support grooves 217 and 219 of the support side walls 216 and 218, and the tip of the inner circumferential surface thereof is supported by the outer circumferential surface of the support jaw 211a. By doing so, it can be supported on the inner surface of the control panel 210.

Hereinafter, a process of assembling the control panel of the microwave oven according to the present invention having such a configuration will be described with reference to FIGS. 3 to 4.

First, the dial knob 240 is coupled to the rotation shaft 239a of the encoder 239 installed at the front of the PCB assembly 230, and the PCB assembly 230 is positioned behind the control panel 210. . Meanwhile, the support ribs 261 and 263 provided on the outer circumferential surface of the cylindrical guide 260 are inserted into the support grooves 217 and 219 of the support side walls 216 and 218 so that the cylindrical guide 260 is inserted into the control panel 210. Support on the side. At this time, the inner circumferential front end portion of the cylindrical guide 260 is supported by the support jaw 211a provided at the inner circumferential edge of the through hole 211.

The PCB assembly 230 is brought into close contact with the rear of the control panel 210 so that the dial knob 240 is inserted into the cylindrical guide 260. In this state, the outer peripheral surface of the locking jaw 245 of the dial knob 240 comes into contact with the inner peripheral surface of the cylindrical guide 260, and the dial knob 240 is supported by the cylindrical guide 260.

In addition, the dial knob 240, while being supported by the cylindrical guide 260, protrudes to the outside through the center of the through hole 211 of the control panel 210, the PCB assembly 230 The fastening holes 232, 233, 234, and 235 contact the front ends of the fastening bosses 212, 213, 214, and 215 of the control panel 210.

The PCB assembly 230 is mounted to the rear of the control panel 210 by fastening screws 252, 253, 254, and 255 that are fastened to the fastening bosses 212, 213, 214, and 215 through the fastening holes 232, 233, 234, and 235. As described above, in the process of mounting the PCB assembly 230 to the rear of the control panel 210 as described above, the dial knob 240 is supported by the cylindrical guide 260.

Therefore, in the process of fastening the fastening screws 252, 253, 254, 255 to the fastening bosses 212, 213, 214, 215, even if the PCB assembly 230 is not mounted at the correct position, the dial knob 240 is moved to the through hole 211. At the center, the through hole 211 is not eccentrically positioned.

According to the present invention described above, since the dial knob is supported by a plurality of cylindrical guides provided on the inner surface of the control panel, in the process of mounting the PCB assembly to the control panel using a fastener, the dial knob and the encoder It can be seen that the basic technical idea is that the relative position of is correctly installed.

Within the scope of the basic technical idea of the present invention, many modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

In the illustrated embodiment, only the encoder and the dial knob for operating the encoder are described, but the present invention is not limited thereto. For example, it is also applicable to a toggle switch and the knob which moves back and forth. In addition, the shape of the cylindrical guide will also vary depending on the shape of the dial knob.

As described in detail above, the control panel structure of the microwave oven according to the present invention, since the dial knob is guided by a cylindrical guide provided on the inner surface of the control panel, using a fastener such as a fastening screw to the rear of the control panel Even if the PCB assembly is not fixed at the correct position in the mounting of the assembly, the relative position of the dial knob and the encoder can be accurately installed.

Claims (5)

A control panel having a through hole formed at one side of the front side and a plurality of fastening bosses projecting rearward from the inner side; A PCB assembly mounted to the rear of the control panel and provided with a switch installed at a position corresponding to the through hole and a plurality of fastening holes corresponding to the fastening bosses; A knob protruding to the outside through the through hole and operating the switch; And A cylindrical guide installed between the inner side of the control panel and the front surface of the PCB assembly to guide the knob; The tubular guide is a control panel structure of a microwave oven is formed in a cone shape of a relatively small diameter of the rear end compared to the front end. delete According to claim 1, wherein the pair of support ribs protruding in the longitudinal direction from the outer peripheral surface of the cylindrical guide and a support groove protruding rearward from the inner surface of the control panel adjacent to the through hole and the support rib is inserted and supported Control panel structure of a microwave oven, characterized in that the supporting side wall is further provided. The control panel structure according to claim 3, wherein the support side wall extends from an outer circumferential surface of the fastening boss adjacent to each other. 5. The control panel structure according to claim 4, further comprising a support jaw projecting rearward from the inner inner circumference of the through hole and supporting the tip of the inner circumferential surface of the tubular guide.

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