JPH09146481A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mark display part having a relatively large area of which the display is made easy to see with a simple structure. SOLUTION: A mark display part 10 is formed by a slit 14 provided on an operation panel 9. A Fresnel lens 13 is integrally molded on the inside surface of the mark display part 10 by use of a transparent resin containing a diffusing material. A light emitting diode 11 is arranged on the inside of the mark display device 10 opposite thereto. Namely, the light of the light emitting diode 11 is projected to the outside through the slit 14, whereby the display of the mark display part 10 can be performed. Since the light of the light emitting diode 11 is converged to the mark display part 10 by the Fresnel lens 13 provided on the inside surface of the mark display part 10, a sufficient brightness can be provided with a simple structure to make the display easy to see, even when the mark display part 10 has a large area, compared with the light emitting diode 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a panel with a mark display portion representing a picture, a character, a symbol, etc., and a light emitting element is arranged inside the panel so that the light of the light emitting element illuminates the mark display portion. The present invention relates to a display device that displays a mark.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned display device has been used, for example, in an operation section of an electric device for displaying an operation state. FIG. 9 is a sectional view of an essential part showing an example of a conventional display device. This display device includes a mark display section 31 fitted to a panel 30 which constitutes an operation switch section of an electric device, and two light emitting diodes 33a and 33b mounted on a printed circuit board 32 and arranged in the main body of the device.
It comprises. The mark display portion 31 is made of a translucent material containing a light diffusing material, and has an outer collar 31 for locking the periphery.
In addition to being formed into a plate shape including a, marks (so-called pictomarks) such as pictures, characters, and symbols are written on the outer surface thereof, and the marks are displayed by being illuminated by the light emitting diodes 33a and 33b. Is going.

[0003]

However, when the area of the mark display portion 31 is large as compared with the area of the light emitting surface of the light emitting diodes 33a and 33b and the amount of light emission thereof, the light emitting diodes 33a and 33b as described above. Since it is necessary to use two of them, there is a problem that the number of light emitting diodes to be used increases and the cost increases. Further, if a high brightness light emitting diode 34 with a large amount of light emission as shown in FIG.
There is a problem in that the distance between and must be set larger than in the case of using the normal light emitting diodes 33a and 33b. Further, as shown in FIG.
A reflector 36 is provided around the wide-directivity light emitting diode 35.
However, there is a problem in that the cost is increased because the reflection plate 36 is used.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device in which the display of a mark display portion having a relatively large area can be easily seen with a simple structure. is there.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is provided with a mark display portion representing a picture, a character, a symbol, etc. on a panel and a light emitting element is disposed inside the panel. A display device that illuminates the mark display portion with the light of the light emitting element to perform the mark display, and is provided with a condensing means for condensing the light of the light emitting element on at least the surface of the mark display portion on the light emitting element side. Even when a light emitting element that emits a small amount of light is used for a mark display section having a relatively large area, the light of the light emitting element is condensed by the light condensing means on the mark display section and illuminates the mark display section. The amount of light can be increased to make the display easier to see.

According to a second aspect of the invention, in the first aspect of the invention, the condensing means is a Fresnel lens,
The light collecting means can be made thin. According to the invention of claim 3, in the invention of claim 2, the Fresnel lens is formed of a synthetic resin containing a light diffusing material, and the Fresnel lens can be easily manufactured by resin molding.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the mark display portion is formed by a slit provided in the panel, and a synthetic resin is filled in the slit to integrally form a Fresnel lens on the panel. Therefore, the assembly process of the mark display portion of the panel and the Fresnel lens can be omitted.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. In the present embodiment, the display device according to the present invention is applied to the call button unit 4 of the intercom master unit A of the intercom system with monitor television shown in FIG. Therefore, first, the configuration and operation of the above door intercom system with monitor television will be briefly described.

In the intercom system shown in FIG. 2, an intercom slave unit B installed at the entrance of a house and an intercom master unit A installed indoors in the house are connected by a two-line signal line Ls. Consists of The intercom slave B is a television camera 20 equipped with a CCD image pickup device, a microphone 21 for collecting a visitor's voice, a speaker 22 for pronouncing a resident's voice transmitted from the intercom master A, and a doorphone master. A call button 23 for calling the machine A or the like is provided.

On the other hand, the intercom base unit A, as shown in FIGS. 2 to 4, has a flat cathode ray tube 1 for displaying an image of the television camera 20 sent from the intercom slave unit B via a signal line Ls, and a housing. The microphone 2 that collects the voice of the resident inside, the speaker 3 that pronounces the voice of the visitor sent through the signal line Ls, and the call function between the intercom slave B are turned on / off. The flat-type cathode-ray tube 1 for displaying only the image of the TV camera 20 with the call button unit 4 and the call function turned off.
And a monitor switch portion 5 for displaying the image on the housing 6. The monitor switch portion 5 is housed in a housing 6 formed by connecting a synthetic resin body 6a and a cover 6b which are formed in a substantially box shape. Note that the door phone base unit A has an external commercial 10
A power supply connection terminal portion 7 for connecting to a 0V power supply and a signal line connection terminal portion (not shown) for connecting the signal line Ls are provided.

Next, the operation of the intercom master unit A and the intercom slave unit B will be described. First, the visitor is the doorphone handset B
When the call button 23 is operated, the intercom slave B activates the TV camera 20 to image the visitor, and the obtained video signal and call signal are transmitted to the intercom master A through the signal line Ls. In the intercom base unit A, the visitor is displayed on the screen of the flat cathode ray tube 1 based on the received video signal, and the speaker 3 is driven to generate a ringing tone. When the resident in the house pushes the call button unit 4 to respond to the ringing tone, the call function via the signal line Ls between the intercom master unit A and the intercom slave unit B is turned on, and then again. The call function is maintained in the ON state until the call button unit 4 is pressed. When the call function is turned on, the intercom slave B and the intercom master A can use the microphones 2 and 21 and the speakers 3 and 22 to make a hands-free conversation, and the intercom slave B The image of the television camera 20 is displayed on the screen of the flat cathode ray tube 1 of the intercom master unit A. The power of the intercom slave unit B is supplied from the intercom master unit A via the signal line Ls. The two signal lines Ls
In order to transmit the video signal, the audio signal, the calling signal, and to supply the power to the intercom slave B by the above, for example, the audio signal may be superimposed on the video signal, which can be realized by a conventionally known technique. Therefore, detailed description will be omitted. Further, electronic parts and the like which constitute a circuit for realizing the above-mentioned call function are mounted on a circuit board 8 which is a printed board, and are housed and fixed in a housing 6 as shown in FIG.

Next, the part that is the gist of the present invention will be described. In the present embodiment, the mark display portion 10 of the display device is formed on the operation panel 9 that constitutes the call button portion 4 of the doorphone master unit A, and the light emitting diode 11 as a light emitting element is mounted in the housing 6 of the doorphone master unit A. Printed circuit board 1
2 is installed. As shown in FIGS. 1 and 5, a Fresnel lens 13 made of a synthetic resin containing a conventionally well-known light diffusing material is integrally molded with the operation panel 9 on the inner side surface of the mark display portion 10 formed on the operation panel 9. It is provided.

The printed circuit board 12 on which the light emitting diode 11 is mounted is mounted with a push button switch 4a constituting the call button section 4 as shown in FIG. The push button switch 4a can be operated by operating the mounted operation panel 9 by operating the operation rib 9a protruding from the inner surface of the operation panel 9.

The operation panel 9 is formed of a synthetic resin into a rectangular plate shape, and a pictomark PM as shown in FIG. 6 is formed on the front surface thereof by a slit 14. The pictomark PM is produced by a speaker. It is intended to inform the user that the call function is on, with a pattern showing the state of being on. A pair of substantially U-shaped spring pieces 15 and fulcrum claws 16 project from the upper end surface of the operation panel 9, and a stopper piece 17 having a locking claw 17a at the tip is provided on the lower end surface. . That is, the mounting hole 6 provided on the cover 6b side of the housing 6
By engaging the tip ends of the spring piece 15 and the fulcrum claw 16 with the upper peripheral edge of c, and by engaging the locking claw 17a of the stopper piece 17 with the lower peripheral edge of the mounting hole 6c,
The operation panel 9 is attached to the housing 6. Here, since the spring piece 15 of the operation panel 9 is slightly bent in the mounted state, the operation panel 9 tries to swing to the front side with the fulcrum claw 16 as the fulcrum due to the restoring force of the spring piece 15. The operation panel 9 is a locking claw 17 of the stopper piece 17.
It is locked by the engagement of a with the peripheral edge of the mounting hole 6c of the housing 6, and as a result, the operation panel 9 is swingable about the fulcrum claw 16 so that the housing 6 can be pushed. Is attached to. Therefore, the spring piece 1
Even if the operation panel 9 is pushed against the restoring force of 5, the operating panel 9 is restored to the original state by the restoring force.

On the other hand, the Fresnel lens 13 formed on the inner surface of the operation panel 9 is formed integrally with the operation panel 9 so that the slit 14 of the operation panel 9 is filled with the transparent ABS resin containing the light diffusing material. Further, a circular peripheral wall 13a is provided upright inward around the Fresnel lens 13. The light emitting diode 11 is mounted on the printed circuit board 12 housed in the housing 6 at a position where its optical axis substantially coincides with the center of the Fresnel lens 13. Here, the printed circuit board 12 on which the light emitting diode 11 is mounted is fixed to the housing 6 such that the end portion of the printed circuit board 12 is engaged with the engaging piece 6d provided so as to face the mounting hole 6c of the housing 6. (See Figure 5).

When the call function of the intercom base unit A is on, the light emitting diode 11 emits light, and the light is emitted to the outside through the slit 14 of the operation panel 9 to form the slit 14. Mark display area 1
By illuminating 0, the pictomark PM is displayed to indicate "busy". Here, according to the present embodiment, the Fresnel lens 13 as a light condensing means is provided on the inner surface of the operation panel 9.
Therefore, the light of the light emitting diode 11 can be condensed and efficiently passed through the slit 14, and even when the area of the mark display portion 10 is relatively large,
It is possible to secure a sufficient amount of light with one light emitting diode 11 without using a plurality of light emitting diodes, high brightness light emitting diodes, or a reflecting plate, so that the mark display portion 10 can be easily seen. Further, by using the Fresnel lens 13 as the light collecting means, the thickness can be made relatively thin. Furthermore, the amount of light that escapes to the side of the Fresnel lens 13 can be reduced by the peripheral wall 13a that is provided upright around the Fresnel lens 13, which also makes the mark display unit 10 easier to see. In addition, as shown in FIG. 7, the slit 14 that constitutes the mark display unit 10
The Fresnel lens 13 may be formed so that the center thereof faces the largest slit 14a among them.
However, also in this case, the optical axis of the light emitting diode 11 and the center of the Fresnel lens 13 are substantially aligned.

By the way, in the present embodiment, the mark display portion 10 is formed by the slit 14 provided in the operation panel 9, and the Fresnel lens 13 is formed on the inner side surface of the mark display portion 10. For example, in FIG. As shown, the pict mark PM may be formed on the outer surface of the Fresnel lens 18 so that the Fresnel lens 18 also serves as the mark display portion 19. In this case, if the surface of the Fresnel lens 18 on which the pictomark PM is formed is so-called textured, the visual field of the pictomark PM can be expanded.

[0018]

According to the first aspect of the present invention, a mark display portion representing a picture, a character, a symbol or the like is provided on a panel, a light emitting element is arranged inside the panel, and the mark display portion is illuminated by the light of the light emitting element. The display device for displaying a mark is provided with a condensing means for condensing the light of the light emitting element at least on the surface of the mark display portion on the light emitting element side. On the other hand, even when a light emitting element that emits a small amount of light is used, the light from the light emitting element is condensed on the mark display portion by the light condensing means, the amount of light that illuminates the mark display portion is increased, and the display is easy to see And it is not necessary to use a light-emitting element that emits a large amount of light, which has an effect of suppressing cost increase.

According to the second aspect of the invention, since the light collecting means is a Fresnel lens, there is an effect that the light collecting means can be made thin. According to the invention of claim 3, since the Fresnel lens is formed of a synthetic resin containing a light diffusing material, the Fresnel lens can be easily manufactured by resin molding, and the manufacturing process can be simplified.

According to the fourth aspect of the present invention, since the mark display portion is formed by the slit provided in the panel, and the Fresnel lens is integrally molded with the panel by filling the slit with synthetic resin, the Fresnel lens can be easily formed. Not only can it be formed, but the process of assembling the mark display portion of the panel and the Fresnel lens can be omitted.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a construction example of a doorphone system with a monitor television in the above.

FIG. 3 is a front view of the intercom master unit in the above.

FIG. 4 is a side sectional view of the intercom master unit in the above.

FIG. 5 is a side sectional view of a main part of the above.

FIG. 6 is a plan view showing a pattern of a pictomark in the above.

FIG. 7 is a side sectional view of an essential part showing another configuration of the above.

FIG. 8 is a side sectional view of an essential part showing still another configuration of the same.

FIG. 9 is a side sectional view showing a conventional example.

FIG. 10 is a side sectional view showing another conventional example.

FIG. 11 is a side sectional view showing still another conventional example.

[Explanation of symbols]

 9 Operation panel 10 Mark display section 11 Light emitting diode 12 Printed circuit board 13 Fresnel lens 14 Slit

Claims (4)

[Claims] 1. A display device in which a mark display portion for displaying pictures, characters, symbols, etc. is provided on a panel, a light emitting element is arranged inside the panel, and the mark display portion is illuminated by the light of the light emitting element to perform the mark display. The display device is characterized in that a light condensing means for condensing the light of the light emitting element is provided at least on the surface of the mark display portion on the light emitting element side. 2. The display device according to claim 1, wherein the condensing means is a Fresnel lens. 3. The display device according to claim 2, wherein the Fresnel lens is formed of a synthetic resin containing a light diffusing material. 4. The display device according to claim 3, wherein the mark display portion is formed by a slit provided in the panel, and the Fresnel lens is formed integrally with the panel by filling the slit with synthetic resin. .