JPH09230805A - Display device of electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to well recognize whether light emitting diodes light or not from the wide range in front of a panel and to prevent the direct recognition of the shapes of the light emitting diodes. SOLUTION: Light diffusion plates 26 are disposed between the light emitting diodes 23 and window parts 18. Further, convex lens parts 29 are disposed between these light diffusion plates 26 and the window parts 18. The light emitted from the light emitting diodes 23 is diffused by the light diffusion plate 26. The diffused light is eventually transmitted through the window parts 18 toward the foci of the convex lens parts 29 by the convex lens parts 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device of an electric device configured to illuminate a window with light emitted from a light emitting diode.

[0002]

A conventional configuration of a display device in an electric device, for example, a microwave oven will be described with reference to FIG. FIG. 9 shows a sectional structure of a display device portion of a panel of a microwave oven. A printed wiring board 2 is arranged behind the panel 1 which constitutes the front surface of the display device so as to face the panel 1. .

On the front side of the printed wiring board 2, a plurality of light emitting diodes 3 and these light emitting diodes 3 are provided.
And a light emitting diode holder 4 that surrounds the light emitting diode 3 while holding the same so as not to fall.
Further, a panel sash 5 is arranged in the front part of the light emitting diode holder 4, and the above-mentioned panel 1 is arranged in the front part of the panel sash 5.

The panel 1 has a flat thin plate shape,
The panel filter 6 is made of a transparent member, and the print sheet 7 is provided on the front surface of the panel filter 6. The printed sheet 7 is transparent at the portions facing the respective light emitting diodes 3 and is opaque at the other portions, so that the respective light emitting diodes 3 in the panel 1 are made transparent.
A window portion 8 for display is formed at a portion facing to.

In the above structure, when the light emitting diode 3 is turned on, the light emitted from the light emitting diode 3 passes through the window portion 8. The user can see that the light emitting diode 3 is lit by looking at the light transmitted through the window 8.

However, in general, the light emitted from the light emitting diode 3 has a strong straight traveling property. Therefore, in the above structure, the light emitted from the light emitting diode 3 is emitted from the window portion 8.
Therefore, it is difficult to see whether or not the light emitting diode 3 is turned on when the window 8 is viewed obliquely from the front. There is also a problem that the shape of the light emitting diode 3 is directly recognized through the window portion 8 and the light emitting diode 3 looks like an eyeball.

The present invention has been made in view of the above circumstances, and an object thereof is to be able to satisfactorily recognize whether or not a light emitting diode is lit from a wide area in front of the panel, and also to allow the light emitting diode to be illuminated. An object of the present invention is to provide a display device for an electric device, which can prevent the shape of the object from being directly recognized.

[0008]

A display device for electric equipment according to the present invention includes a light emitting diode, a panel provided with a window portion having a light transmitting property in a portion corresponding to the front of the light emitting diode, the panel and the above-mentioned panel. A light diffusing plate disposed between the light emitting diode and diffusing the light emitted from the light emitting diode, and provided on the back side of the panel filter at a portion corresponding to the window, And a convex lens portion that guides the diffused light toward the window portion.

In the display device of the electric device having the above structure,
When the light emitting diode is turned on, the light emitted from the light emitting diode is diffused by the light diffusion plate, and the diffused light is guided toward the window portion by the convex lens portion. This allows light from multiple directions to pass through the window and be emitted in multiple directions, so unlike the conventional configuration, the window can be opened not only from the front but also from the diagonal front. Even if it sees, it can be satisfactorily recognized whether the light emitting diode is lit. At this time, since the light diffusion plate is provided between the window and the light emitting diode, the shape of the light emitting diode is not directly recognized.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a display device of a microwave oven will be described below with reference to FIGS. First, in FIG. 2 showing the appearance of the microwave oven, the microwave oven main body 11 is configured by forming a heating chamber 13 in an outer case 12, and the heating chamber 1 is provided on the front surface.
A door 14 for opening and closing 3 is pivotally installed, and a panel 15 is provided on the right side of the door 14.

As shown in FIG. 1, the panel 15 is composed of a panel filter 16 made of a transparent member and a print sheet 17 provided on the front surface of the panel filter 16. The print sheet 17 has a portion corresponding to a light emitting diode and a portion corresponding to a lamp, which will be described later, made transparent and other portions made opaque. As a result, as shown in FIG. A plurality of windows 18 and a plurality of windows 19 for lamps are formed. In addition, the display 2 is provided on the upper part of the panel 15.
0 is provided, and an operation button 21 is provided at the bottom (see FIG. 2).

In FIG. 1 showing a cross section of the panel 15 on the light emitting diode side, a printed wiring board 22 is disposed behind the panel 15 so as to be located inside the main body 11. On the front surface of the printed wiring board 22, a light emitting diode 23 is provided at a portion corresponding to each of the windows 18 described above.
Are provided respectively, and lamps (not shown) are provided at portions corresponding to the respective window portions 19.

A light emitting diode holder 24 is provided on the front surface of the printed wiring board 22 so as to individually surround each light emitting diode 23 and prevent the light emitting diode 23 from collapsing. The light emitting diode holder 24 is formed of a color having a high reflectance such as white.

A panel sash 25 made of a non-translucent material is arranged at the front of the light emitting diode holder 24, and the front of the panel sash 25 is convex so as to individually surround the light emitting diodes 23. The part 25a is integrally provided.

A light diffusing plate 26 made of, for example, a natural color polypropylene resin is disposed between the panel 15 and the panel sash 25 described above. This light diffusion plate 2
As shown in FIG. 4, 6 includes a light emitting diode diffusion portion 27 that diffuses light emitted from the light emitting diode 23 and a lamp diffusion portion 28 that diffuses light emitted from the lamp, which are integrally formed. The surface on the panel 15 side as the light diffusing surface 26a is textured.

At the front part of the panel sash 25, the above-mentioned panel 15 is arranged so as to cover the light diffusing plate 26 from the front. A convex lens portion 29 projecting rearward is integrally formed with the panel 15 at a portion on the back surface side of the panel 15 corresponding to each light emitting diode 23, and a surface 29a of the convex lens portion 29 is textured. Has been done. In this case, as shown in FIG. 5, in the panel 15, the thickness of the convex lens portion 29 portion (see d1 in FIG. 5) is about 2.8 mm, and the thickness of the flat portion other than the convex lens portion 29 portion (in FIG. 5). , D2) is set to about 1.6 mm.
The external dimensions of the window portion 18 (see w1 in FIG. 5) are about 2 mm, and the external dimensions of the convex lens portion 29 (w in FIG. 5).
2) is about 4.2 mm, and the convex lens portion 29 of the light diffusion plate 26 is
The outer dimension (see w3 in FIG. 5) of the light diffusing surface 26a corresponding to is set larger than the outer dimension of the convex lens portion 29.

Now, in the above structure, when the light emitting diode 23 is turned on, the light emitted from the light emitting diode 23 is transmitted to the panel 15 and the light diffusing plate 26 by the light diffusing plate 26.
Spread between and. Then, the light diffused by the light diffusion plate 26 is transmitted through the window portion 18 so as to be directed to the focal point of the convex lens portion 29 by the convex lens portion 29, and then emitted in multiple directions in front of the panel 15. At this time,
Since the surface 29a of the convex lens portion 29 is textured, the light transmitted through the window portion 18 is diffused in more directions.

With respect to the above-mentioned structure, as shown in FIGS. 6 and 7, when the window 18 is viewed from the up and down direction and the left and right direction, the angles at which “missing emission of light” and “invisible” are measured, The results shown in FIG. 8 were obtained.
Here, “not visible” means that the light emission of the light emitting diode 23 cannot be confirmed.

That is, the light-diffusing plate 26 of the present invention and the convex lens portion 29 are provided with "missing light emission" as compared with the conventional structure without the light-diffusing plate 26 and the convex lens portion 29. The angle is wide in both the up-down direction and the left-right direction, and the angle of "not visible" is unlimited within the range viewed by the user. Therefore, according to the present invention, the light emitting diode 23
It can be seen that the field-of-view area in which whether or not is lit can be identified is expanded.

According to this embodiment, the light emitted from the light emitting diode 23 is diffused by the light diffusing plate 26, and the diffused light is transmitted through the window portion 18 toward the focal point of the convex lens portion 29. Since the light is emitted from the window 18 in multiple directions, whether the light emitting diode 23 is lit or not is good not only when looking at the window 18 from the front but also obliquely from the front. Can be recognized. In this case, since the light diffusing plate 26 is present in front of the light emitting diode 23, the shape of the light emitting diode 23 is not directly recognized, and the light emitting diode 23 can be prevented from looking like an eyeball.

Further, since the outer dimension of the convex lens portion 29 is larger than the outer dimension of the window portion 18 and smaller than the light diffusing surface 26a of the light diffusing plate 26 corresponding to the convex lens portion 29, the light diffusing plate is formed. Most of the light diffused by 26 is transmitted through the window 18. Further, by providing the convex lens portion 29 integrally with the panel 15, the convex lens portion 2
It is not necessary to separately provide 9, and the number of parts can be reduced accordingly. Further, the light diffusing plate 26 is configured to integrally include the light emitting diode diffusing portion 27 and the lamp diffusing portion 28, so that it is not necessary to separately provide the light emitting diode diffusing portion 27 and the lamp diffusing portion 28. The number of parts can be reduced accordingly.

It is needless to say that the present invention is not limited to the display device of the microwave oven and can be applied to the display device of other electric equipment such as a rice cooker.

[0023]

As is apparent from the above description, according to the display device of the electric apparatus according to the first aspect, the light emitted from the light emitting diode is diffused by the light diffusing plate, and the diffused light is a convex lens. As it passes through the window toward the focal point of the part and is emitted in multiple directions from the window,
It becomes possible to satisfactorily recognize whether or not the light emitting diode is lit from a wide area in front of the panel, and it is possible to prevent the shape of the light emitting diode from being directly recognized by the light diffusion plate.

According to the display device of the electric device according to the second aspect, a large amount of light diffused by the light diffusing plate can be guided to the window portion. According to the display device of the electric device according to the third aspect of the present invention, the surface of the convex lens portion is subjected to the embossing, so that the light emitted from the window portion can be emitted in more directions. It is possible to further widen the visual field area in which it is possible to identify whether or not the light is on.

According to the display device of the electric device according to the fourth aspect, by integrally providing the convex lens portion on the panel, it is not necessary to separately provide the convex lens portion, and the number of parts can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional side view of a main part showing one embodiment of the present invention.

FIG. 2 is an external perspective view of a microwave oven.

FIG. 3 is a perspective view of the main part of the panel.

FIG. 4 is a front view of a light diffusion plate.

FIG. 5 is an enlarged vertical side view of a convex lens portion.

FIG. 6 is a diagram showing a state in which a window is viewed from above and below.

FIG. 7 is a diagram showing how the window is viewed from the left and right sides.

FIG. 8 is a diagram showing measurement results.

FIG. 9 is a diagram corresponding to FIG. 1 showing a conventional configuration.

[Explanation of symbols]

In the drawings, reference numeral 15 is a panel, 18 is a window portion, 23 is a light emitting diode, 26 is a light diffusion plate, 27 is a light emitting diode diffusion portion, and 29 is a convex lens portion.

Claims (4)

[Claims] 1. A light emitting diode, a panel provided with a translucent window portion in a portion corresponding to the front of the light emitting diode, and a panel disposed between the panel and the light emitting diode. A light diffusing plate for diffusing the emitted light, and a part provided on the back side of the panel corresponding to the window part and guiding the light diffused by the light diffusing plate toward the window part. A display device for an electric device, comprising: a convex lens portion. 2. The display device for an electric device according to claim 1, wherein an outer dimension of the convex lens portion is larger than an outer dimension of the window portion and smaller than a light diffusing surface of the light diffusing plate. 3. The display device for electric equipment according to claim 1, wherein the convex lens portion has a textured surface. 4. The display device for an electric device according to claim 1, wherein the convex lens portion is formed integrally with the panel.