KR930011374B1 - Cooking device - Google Patents

Abstract

No content.

Description

Cooker

The drawings show an embodiment of the present invention.

1 is an enlarged longitudinal sectional view of a main part.

2 is a perspective view of a microwave oven.

3 is a configuration diagram of a control circuit.

4 is an operation state diagram of each part.

* Explanation of symbols for main parts of the drawings

1: body 2: door

3: liquid crystal display 4: photocell (light receiving element)

10 microcomputer 13: light emitting diode

20: NOT circuit (control means)

The present invention relates to a cooker having a liquid crystal display.

Here, the term "liquid crystal" refers to anisotropy in which the liquid crystal has regularity like optically crystal while having liquidity like liquid.

In the display device, a nematic phase dynamic scattering phenomenon in which a liquid crystal, which has been disturbed by dispersing a molecular array by scattering light and scatters light, is used, is used, and a contrast of about 15 to 1 is obtained. As the display device, a liquid crystal material is sandwiched between a glass plate coated with a transparent conductive film and a glass plate with electrodes having a matrix structure, and voltages according to patterns are applied to each element electrode to observe reflected light or transmitted light of an external light source. As liquid crystals, there are other field effect types using polarization. Liquid crystals have a slow response, and special display is required for displaying television images. In addition, since the liquid crystal itself is inexpensive but has a drawback in that the peripheral circuit is complicated, there is a problem in terms of cost for displaying a large screen having many pixels. Therefore, it is practical for display of numbers and letters, such as clock.

For example, in a microwave oven, a fluorescent display tube has conventionally been used as an indicator for displaying cooking contents, cooking time, and the like, but it has recently been considered to use a liquid crystal display for the purpose of reducing power consumption.

However, the liquid crystal display does not emit light by itself, as is well known, so that light in the room can be viewed by reflection.

However, this makes it difficult to see the display contents of the liquid crystal display when the room is dark such as in the evening.

To solve this drawback, a light emitting device such as a lamp for illuminating a liquid crystal display and a light emitting diode may be provided. This results in a waste of power because the light emitting device is energized even when the room is bright.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and an object thereof is to include a liquid crystal display and a light emitting element for illuminating the liquid crystal display. Therefore, the light emitting element is energized to emit light only when the surroundings are dark. It is to provide a cooker that can be prevented.

The cooker of the present invention is provided with a liquid crystal display and a light emitting element for illuminating the liquid crystal display, the control means for providing a light receiving element for detecting the brightness of the surroundings, and controlling the light emitting element through the total power in accordance with the amount of light received by the light receiving element. It is characterized by the installation.

The light receiving amount of the light receiving element is large when the surroundings are bright and small when the surroundings are dark.

The light emitting element outputs a signal in accordance with the magnitude of the received amount of light, and control reception powers off (lights off) the light emitting element when the surroundings are bright according to the signal, and energizes (light emitting) when the surroundings are dark.

EMBODIMENT OF THE INVENTION Hereinafter, the Example which applied this invention to the microwave oven is demonstrated, referring drawings.

First, in FIG. 2 which shows the whole microwave oven, the front part of the main body 1 is equipped with the door 2 which opens and closes the heating chamber (not shown) provided in the main body 1.

On the upper part of the door 2, a liquid crystal display 3 is arranged on the left side, and a photovoltaic cell (solar cell) 4, for example, as a light receiving element for detecting the brightness of the surroundings (in a room with a microwave oven) is arranged in the center. And the operation switch 5 group is arrange | positioned at the right side.

The door 2 described above is attached to the rear of the chassis 6 while attaching a translucent outer barrier 7 to the inside of the rectangular chassis 6 so that the heating chamber can be seen as shown in FIG. The board 8 is attached and comprised.

A printed wiring board 9 is attached to the door plate 8, and the photovoltaic cell 4, the operation switch group 5, and the microcomputer 10 for controlling cooking are attached to the printed wiring board 9. The control circuit 11 (refer to FIG. 3) etc. which mainly use is provided.

By the way, the liquid crystal display 3 is attached to the printed wiring board 9 by sandwiching a transparent or translucent light guide plate 12.

In the recess 12a formed in the light guide plate 12, a light emitting diode 13, which is a light emitting element mounted on the printed wiring board 9, is located at the rear of the liquid crystal display 3 and accommodated therein. The liquid crystal display 3 is illuminated by ().

On the other hand, a hole 14 is formed between the door chassis 6 and the outer barrier 7 in correspondence with the group of the liquid crystal display 3, the photovoltaic cell 4 and the operation switch 5, and these holes 14 are formed. The character sheet 15 is adhered so as to block the gap.

In addition, the character sheet 15 has a character for indicating the kind of each operation switch 5, for example, and the part corresponding to the said hole 14 is transparent.

The transparent filter 16 positioned between the character sheet 15 and the liquid crystal display 3 is fitted into the outer barrier 7 hole 14 corresponding to the liquid crystal display 3.

3 shows a control circuit configuration. The microcomputer 10 is supplied with power from a DC power supply circuit 19 connected in series with a power switch 18 to a commercial power supply 17.

The microcomputer 10 is provided with a signal from a group of operation switches 5 for setting cooking contents and the like.

Then, the microcomputer 10 displays the cooking contents and the cooking time set by the operation switch 5 on the liquid crystal display 3, and simultaneously energizes a magnetron not shown in accordance with a program stored in advance in the memory. Control to execute the set cooking.

The output of the photovoltaic cell 4 is provided to the NOT circuit 20 as a control means mounted on the printed wiring board 9, and the output to the NOT circuit 20 is provided to the light emitting diode 13.

The NOT circuit 20 is supplied with power from the DC power supply circuit 19.

When the operation switch 5 to be cooked is operated in the above configuration, the liquid crystal display 3 displays the display according to the operation contents.

On the other hand, the photovoltaic cell 4 generates an electromotive force according to the ambient, i.e., room brightness, as shown in FIG.

That is, when the room is bright, the photocell 4 receives a large amount of light, so the electromotive force of the photovoltaic cell 4 is large, so that a high level signal is input from the photocell 4 to the NOT circuit 20.

Then, the output of the NOT circuit 20 becomes the low level state in which the high level signal is inverted, so that the light emitting diode 13 is turned off.

In this case, since the room is bright, the user can clearly see the display contents of the liquid crystal display 3 according to the reflection of the room light.

When the room is dark, such as in the evening, the photocell 4 has a small amount of light received, so the electromotive force of the photovoltaic cell 4 is small. Therefore, a low level signal is input from the photocell 4 to the NOT circuit 20.

Then, the output of the NOT circuit 20 is in the high level state in which the low level signal is inverted, so that the light emitting diode 13 is turned on.

The light emitted from the light emitting diodes 13 passes through the liquid crystal display 3, and the transmitted light allows the user to clearly see the display content of the liquid crystal display 3.

In addition, in the above embodiment, the output level of the photovoltaic cell 4 is inverted by the NOT circuit 20 so that the light emitting diode 13 can be fully energized. However, the output of the photovoltaic cell 4 is input to the microcomputer 10, The light emitting diodes 13 may be collectively controlled by a program.

The light-receiving element is not limited to the photovoltaic cell 4, and may be a photodiode. The light-emitting element is not limited to a light-emitting diode and may be an electroluminescent light.

In addition, the light emitting element is not limited to illuminating the liquid crystal display from the rear side, but may be configured to illuminate from the front side so that the contents of the liquid crystal display can be known by the reflected light.

In addition, this invention is not limited to the Example shown above and shown in the figure, It can be implemented in various changes within the range which does not deviate from the summary, such as being applicable to the general cooking machine provided with a liquid crystal display.

As described above, according to the present invention, since the brightness of the surroundings is detected by the light receiving element, and the control means is used to control the light emitting element for illumination of the liquid crystal display according to the light receiving amount of the light receiving element, the light emitting element is disconnected only when the surroundings are bright. Therefore, it is possible to obtain an excellent effect without causing the light emitting element to emit light unnecessarily without wasting power.

Claims (1)

A main body 1, a liquid crystal display 3 provided on the front side of the main body, a light emitting element 13 provided near the display and illuminating the liquid crystal display, and an output which changes in accordance with ambient brightness And a light receiving element (4) and control means for controlling energization to the light emitting element in accordance with the output of the light receiving element.

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