JP5144574B2 - Surface emitting panel with pronunciation function - Google Patents

Description

  The present invention relates to a light guide plate, and more particularly to a surface light emitting panel with a sound generation function.

  2. Description of the Related Art Conventionally, a panel device 1a using a so-called edge light type light guide plate 2a in which one end portion of a panel-shaped light guide plate 2a is an incident end surface portion 23a for introducing light from a light source 4 is known. ing. For example, the panel device 1a as shown in FIG. 3 is configured by providing the light source 4 made of LEDs on the incident end face portion 23a of the light guide plate 2a. The light guide plate 2a is provided with a diffuse reflection portion 24a composed of a plurality of light guide patterns on the back surface of the light guide plate 2a, and diffuses and reflects light that is incident from the incident end surface portion 23a and repeatedly propagates in the light guide plate 2a. The light is emitted from the front portion of the light guide plate 2a by the portion 24a, and the front portion of the light guide plate 2a emits light in a planar shape. In addition, 6a in the figure has shown the frame part.

  By the way, it is considered that a panel device that performs such surface light emission and an acoustic device are arranged in parallel to emit light and generate sound simultaneously.

  The acoustic device is, for example, as shown in FIG. 4, and is configured by fixing a vibrator 3 a to the back surface of the diaphragm 8, and the diaphragm 8 is excited by the vibrator 3 a to generate sound. It is like that. In addition, 6b in the figure has shown the frame part.

  When such a panel device and an acoustic device are arranged side by side, a panel (light guide plate) of the light emitting device and a panel (vibration plate) of the acoustic device are required, which not only requires a lot of installation space but also costs. There was a problem of becoming high.

  In view of this, it is conceivable to use the light guide plate of the panel device as a diaphragm of an acoustic device (see, for example, Patent Document 1). In this patent document 1, a light guide plate is disposed on the back surface of a liquid crystal panel, and a light emitting diode serving as a light source and a piezoelectric element serving as a vibrator are projected from one end surface of the light guide plate. It is provided on the protruding plate-shaped portion thinner than the thickness of the plate.

Japanese Patent Laid-Open No. 2007-072018

  By the way, regarding the panel device that emits surface light, when the above-described configuration is adopted and the light guide plate and the vibration plate are combined, it is necessary to newly provide a protruding plate-like portion that is thinner than the light guide plate from one end of the light guide plate. is there.

  On the other hand, it is conceivable to directly attach a vibration exciter to the back surface of the light guide plate without providing the protruding plate-like portion. However, since the light guide plate is formed of a transparent member, There was a problem that the container could be seen from the front and looked bad.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to use both the light guide plate and the vibration plate in the light emission and sound generation by the light guide plate, and the back surface of the light guide plate. It is an object of the present invention to provide a surface emitting panel with a sound generation function that does not deteriorate the appearance even when a vibrator is directly fixed to the screen.

  In order to solve the above problems, the present invention has the following configuration.

That is, in the invention according to claim 1, light from the light source 4 is incident from a part of the outer peripheral end surface, and the incident light is diffusely reflected on the diffuse reflection portion 24 provided on the back surface portion 22 and emitted from the front surface portion 21. The surface emitting panel 1 with a sound generation function includes a light guide plate 2 to be excited and a vibrator 3 for exciting the light guide plate 2. The diffuse reflection section 24 is configured by providing light guide patterns 241 partially provided on the back surface of the light guide plate 2 at a plurality of locations. The light guide pattern 241 is formed so that the area increases as the distance from the incident end face portion 23 increases. Only one exciter 3 is provided on the back surface of the light guide pattern 241 in the substantially central portion of the light guide plate 2 and is smaller than the light guide pattern 241 in the substantially central portion of the light guide plate 2 in a front view. Is formed.

  With this configuration, when light from the light source 4 is incident on a part of the outer peripheral end face of the light guide plate 2, the incident light is irregularly reflected at a portion where the vibrator 3 is provided and is emitted in a planar shape. Therefore, even when the vibrator 3 is provided on the back surface of the light guide plate 2, the vibrator 3 is not seen from the front surface, and the appearance is not impaired. In addition, the light guide plate 2 can also be used as a diaphragm, so that the cost can be reduced and a surface light emitting panel capable of sound generation and light emission can be provided in a narrow space.

Moreover, it can comprise so that the light radiate | emitted from the front-surface part 21 of the light-guide plate 2 may be changed partially, and various types of planar light emission can be performed.

  According to the present invention, since the light guide plate can also be used as a vibration plate, the cost can be reduced, and the vibrator is not seen from the front portion of the light guide plate, which deteriorates the appearance. Can be avoided. In addition, since it is only necessary to fix the vibrator to the back surface of the light guide plate via the diffuse reflection part, it is not necessary to provide a part for newly providing the vibrator, and the structure can be simplified. At the same time, the manufacturing cost can be reduced.

It is the schematic of the principal part cross section of the panel apparatus of one Embodiment of this invention. It is a rear view of a light guide plate same as the above, (a) is a light guide plate of this embodiment, and (b) is a light guide plate of another example. It is the schematic for demonstrating the conventional panel apparatus, (a) is a front view, (b) is principal part sectional drawing. It is the schematic for demonstrating the conventional acoustic apparatus, (a) is a front view, (b) is principal part sectional drawing.

  The present invention will be described below with reference to the accompanying drawings.

  The surface emitting panel 1 with a sound generation function of the present embodiment is incorporated in a panel device as shown in FIG. This panel device fixes a surface light emitting panel 1 with a sound generation function, a light source 4 provided at one end (a part of an outer peripheral end surface) of the surface light emission panel 1 with a sound generation function, a light source 4 and a light guide plate 2. And a frame 6 that covers the upper and lower edges of the front surface of the light guide plate 2.

  The surface emitting panel 1 with a sound generation function includes an edge light type light guide plate 2 and a vibrator 3 provided on the back surface of the light guide plate 2 to excite the light guide plate 2.

  The light guide plate 2 is one of end surfaces of the front surface portion 21 (one surface facing the thickness direction), the back surface portion 22 (the other surface facing the thickness direction), and the light guide plate 2 (this embodiment). In the embodiment, an upper end) and an incident end face portion 23 for introducing light from the light source 4 are provided. The light guide plate 2 of the present embodiment is made of a colorless and transparent acrylic resin. A diffuse reflection portion 24 is provided on the back surface portion 22, and a part of light that is incident from the incident end face portion 23 and repeatedly propagates in the light guide plate 2 is diffusely diffusely reflected by the diffuse reflection portion 24. The light can be emitted from the front surface portion 21 of the light guide plate 2.

  The diffuse reflection portion 24 is configured by providing light guide patterns 241 partially provided on the back surface portion 22 of the light guide plate 2 at a plurality of locations. The light guide pattern 241 is formed by dot printing of diffusible white ink or the like. As shown in FIG. 2A, the diffuse reflection portion 24 of the present embodiment has a light guide pattern 241 near the incident end surface portion 23 that has a smaller density, and the density gradually decreases as the distance from the incident end surface portion 23 increases. It is large and is configured to be sparse on the side close to the incident end face part 23 and gradually change from sparse to dense as the distance from the incident end face part 23 increases. Thereby, the surface light emission in the light-guide plate 2 of a panel apparatus becomes uniform in the front part 21. FIG.

  In addition, as shown in FIG. 2B as the light guide pattern 241, the area of the portion close to the incident end face portion 23 is reduced and the incident end face portion is maintained while the dot density of the light guide pattern 241 is kept constant. It is also possible to emit uniform light from the front surface portion 21 of the light guide plate 2 with an area ratio such that the area gradually increases as the distance from the light source 23 increases. Of course, the light quantity may be changed by the portion on the light guide plate 2 without changing the area ratio and density according to the distance from the incident end face portion 23 as described above.

  In addition, in the Example in Fig.2 (a) and FIG.2 (b), the vibrator 3 is provided in the site | part shown with the numerals K1 and K2 in a figure.

  The vibrator 3 is fixed to the portion where the light guide pattern 241 is formed on the back surface of the light guide plate 2 through the adhesive layer 7. The vibrator 3 generates a sound by using the light guide plate 2 as a diaphragm. That is, sound can be generated by exciting the light guide plate 2 with the vibrator 3 to cause flexural vibration. Only one vibrator 3 of the present embodiment is provided at the substantially central portion of the light guide plate 2.

  The surface emitting panel 1 with such a sound generation function is mounted on the base portion 5 of the panel device, and the light source 4 fixed to the base portion 5 is installed so as to face the incident end surface portion 23 of the light guide plate 2. . The light source 4 of this embodiment includes a substrate base 41 fixed to the base portion 5, a substrate 42 provided on the substrate base 41, and an LED 43 (Light Emitting Diode) provided on the substrate 42. The substrate base 41, the substrate 42, and the LED 43 constitute one unit. The light source 4 in the present embodiment is provided at the upper edge of the light guide plate 2 in a front view. Although not particularly illustrated, the LED 43 on the substrate 42 can be turned on / off by an ON / OFF switch connected to the substrate 42.

  Further, a frame 6 that covers both upper and lower edges of the light guide plate 2 is detachably installed after the light source 4 and the surface emitting panel 1 with a sound generation function including the light guide plate 2 are mounted on the base portion 5. The light source 4 is accommodated in a frame portion 6 that covers the upper and lower edges, and the light source 4 is protected by the frame portion 6.

  When the light source 4 of such a panel device is turned on, the light from the light source 4 enters from the incident end face portion 23 of the light guide plate 2. The light propagates toward the opposite end while repeating reflection in the light guide plate 2, but a part of the light that repeats reflection is provided on the back surface portion 22 of the light guide plate 2. The light is diffusely reflected by the light 241 and is emitted from the front surface portion 21 of the light guide plate 2. At this time, since the vibrator 3 is provided on the back surface of the light guide pattern 241, the vibrator 3 cannot be seen from the front by the light emitted from the light guide plate 2.

  If such a surface emitting panel 1 with a sound generation function is used, it is not necessary to newly provide a diaphragm for only sound, and it is possible to achieve compactness and cost reduction. In addition, since it is only necessary to provide the vibrator 3 on the back surface of the light guide pattern 241 via the adhesive layer 7, it is possible to provide a sound generation function to the light guide plate 2 while keeping the structure simple.

  In the present embodiment, the front surface portion 21 of the light guide plate 2 serving as the light exit surface is exposed. However, the front surface portion 21 of the light guide plate 2 is formed with a plurality of holes so that the acoustic performance is improved. If it covers with the decorative panel which has the permeability | transmittance which prevented the fall, while improving appearance, the front-surface part 21 of the light-guide plate 2 can be protected from external force. In addition, this decorative panel may be configured by a transparent plate or may be configured by applying a pattern such as a wood grain pattern.

  In the above embodiment, the light guide plate 2 is made of acrylic resin. However, for example, glass may be used as long as it is a light transmitting material. In the present embodiment, the incident end face portion 23 is provided on the upper end face of the light guide plate 2, but not limited to the upper end face, any end face may be used as the incident end face portion 23. Furthermore, the upper and lower end faces may be the incident end face portion 23.

  Further, in the present embodiment, the light guide pattern 241 is formed by applying white ink. However, for example, any conventionally known one such as laser processing of prism-shaped unevenness or pasting of a reflective film may be used. This method can also be formed.

  Moreover, although the vibrator 3 in the said embodiment is comprised so that only one may be provided in the approximate center part of the light-guide plate 2, it is to the some light guide pattern 241 formed in the back surface part 22 of the light-guide plate 2. As shown in FIG. On the other hand, even if it comprises so that several exciter 3 may be provided, it cannot be overlooked that it can prevent all the several exciters 3 from being visible from the front, and it may impair appearance.

DESCRIPTION OF SYMBOLS 1 Surface emitting panel with sound generation function 2 Light guide plate 21 Front part 22 Back part 23 Incident end face part 24 Diffuse reflection part 241 Light guide pattern 3 Exciter 4 Light source 41 Substrate base 42 Substrate 43 LED
5 Base part 6 Frame part 7 Adhesive layer 8 Diaphragm

Claims (1)

A light guide plate that makes light from a light source incident from a part of the outer peripheral end surface, diffuses the incident light to a diffuse reflection part provided on the back surface, and emits the light from the front surface;
A vibrator for exciting the light guide plate;
A surface emitting panel with a sound generation function,
The diffuse reflection part is configured by providing a plurality of light guide patterns partially provided on the back surface part of the light guide plate,
This light guide pattern is formed so that the area increases as the distance from the incident end face portion increases.
Only one of the vibrators is provided on the back surface of the light guide pattern in the substantially central portion of the light guide plate, and is smaller than the light guide pattern in the substantially central portion of the light guide plate in a front view. A surface-emitting panel with a pronunciation function, characterized by the fact that

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