JP2007234470A - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device executing an effective action for an ornamental purpose or the like, and using easily manufacturable light emitting diodes. <P>SOLUTION: This light emitting device 10 is composed by forming a translucent pipe 15 by combining three or more translucent plates 12a, 12b and 12c each having light emitting diodes 20 mounted thereon by setting the surface with the light emitting diodes 20 mounted thereon on the inside surface side, and by mounting lids 30 to both edge parts of the translucent pipe 15. The lid 30 mounted to one-side edge part of the translucent pipe 15 is electrically connected to one-side electrodes of the light emitting diodes 20 mounted on the translucent plates, and the lid 30 mounted to the other-side edge part of the translucent pipe 15 is electrically connected to the other-side electrodes of the light emitting diodes 20 mounted on the translucent plates. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light emitting device using a light emitting diode.

In recent years, light emitting diodes capable of obtaining high luminance with low power have been provided, and are used for various applications such as home appliances, OA devices, and in-vehicle devices as light sources that can be easily used. Light-emitting diodes used in these applications are mounted with a light-emitting diode mounted on a support base provided with a lead, and the light-emitting diode is sealed with a transparent cap with a lens function, or a light-emitting diode. This is a product in which a light emitting diode is mounted on the bottom of the base in which the inner surface of the storage recess is formed as a light reflecting surface, and the opening of the storage recess is sealed with a translucent body (for example, see Patent Document 1).
JP 2005-136137 A

As described above, a light emitting diode generally used as a light source for display or the like is provided by mounting a light emitting diode chip on a package, and the light emitting diode is incorporated in a device in accordance with the light emission direction. It is used. For this reason, a product assembled using a light emitting diode has conventionally been made such that the light emitted from the light emitting diode can be visually recognized from the outside by directing the light emitting diode in a predetermined direction.
However, the light-emitting device configured as described above is insufficient in terms of decorativeness and the like because light from a light-emitting diode can be visually recognized in one direction but light cannot be visually recognized from multiple directions.

  The present invention provides a light-emitting device using a light-emitting diode that can visually recognize light from a light-emitting diode not only in one direction but also from multiple directions, has an effective effect for decoration, and is easy to manufacture. With the goal.

The present invention has the following configuration in order to achieve the above object.
That is, a translucent plate on which light emitting diodes are mounted is formed by combining three or more translucent plates with the surface on which the light emitting diodes are mounted on the inner surface side, and lids are attached to both edge portions of the translucent tube A light-emitting device formed by the method, wherein a lid attached to one end edge of the light-transmitting cylinder is electrically connected to one electrode of a light-emitting diode mounted on the light-transmitting plate, and The lid mounted on the other edge of the optical tube is electrically connected to the other electrode of the light emitting diode mounted on the light transmitting plate. The one electrode and the other electrode of the light emitting diode mean one and the other of the cathode electrode and the anode electrode of the light emitting diode.

The translucent plate is provided with a wiring pattern electrically connected to one electrode of the light emitting diode and a wiring pattern electrically connected to the other electrode of the light emitting diode. A lid attached to one edge of the tube is electrically connected to a wiring pattern electrically connected to one electrode of the light emitting diode, and is attached to the other edge of the light transmitting tube. The lid is electrically connected to a wiring pattern electrically connected to the other electrode of the light emitting diode.
In addition, since the wiring pattern is provided as a common wiring pattern for a plurality of light emitting diodes, electrical connection between the light emitting diode and the lid is facilitated, and a voltage is applied to the light emitting diode from the lid. The light emitting diode can be easily lit by being electrically connected to a power source.

The lid includes a lid portion that covers an end surface of the translucent tube, and an insertion portion that is formed in an end surface shape that matches the end surface shape of the inner surface of the translucent tube, and the insertion portion is the translucent tube. The wiring pattern and the connecting portion provided in the fitting portion are electrically connected to each other so that the light emitting diode and the lid are electrically connected.
In addition, since the outer shape of the end surface of the lid portion is formed in a shape that matches the outer shape of the end surface of the translucent tube, the translucent tube and the lid are integrally formed.

The lid is made of a conductive material, and the lid itself is formed as a connection portion that is electrically connected to the wiring pattern, and a connection electrode that is electrically connected to a power source that applies a voltage to the wiring pattern. As a result, electrical connection between the light emitting diode and the lid is further facilitated.
Further, the light emitting diode and the wiring pattern can be electrically connected by wire bonding or by flip chip connection.
In addition, since the cooling tube is filled with a cooling liquid and the through hole tube is hermetically sealed by the lid, heat generated from the light emitting diode can be effectively dissipated, and a large power It is possible to mount a light emitting diode with a large calorific value.

  According to the light emitting device of the present invention, the light emitting diode is mounted on the inner surface of the translucent tube, and the light emitting diode and the lid are electrically connected to each other. The light emitting diode can be turned on by electrically connecting the lid. Since the light emitting diode is mounted in the translucent tube, the light emitting diode can be surely protected, and by emitting light in the translucent tube, the light transmitted through the translucent tube is visually recognized from the outside, and the through hole is provided. The entire outer surface of the translucent tube appears to shine by the action of the light reflected and scattered in the tube, and the light emitting device is provided with good appearance. In addition, after a light emitting diode is mounted on each light transmitting plate, a light transmitting tube is formed by combining the light transmitting plates on which the light emitting diodes are mounted, so that there is an advantage that it can be manufactured without complicated manufacturing processes. .

(First embodiment)
FIG. 1 is an assembled perspective view showing a configuration of a first embodiment of a light emitting device according to the present invention. The light-emitting device 10 of the present embodiment includes a light-transmitting tube 15 formed by combining light-transmitting plates 12a, 12b, and 12c made of a transparent material such as glass so that the outer shape of the end surface is a regular triangle, and a light-transmitting plate The light emitting diode 20 is mounted on the inner surface of each of 12a, 12b, and 12c, and the lid 30 is attached to each end of the translucent tube 15. The light emitting diode 20 is formed in a chip shape having a cathode electrode and an anode electrode.

The translucent tube 15 is formed by obliquely cutting both end edges of the translucent plates 12a, 12b, and 12c, making the oblique cut portions 121 face each other, and bonding them using a transparent adhesive. Is formed into a cylindrical body. The interior of the translucent tube 15 is a space in which the light emitting diode 20 is mounted, and the end surface shape of the inner surface of the translucent tube 15 is also an equilateral triangle.
The lid 30 includes a lid portion 30a having an outer shape of an end face that is formed in a regular triangle in accordance with the outer shape of the light-transmitting cylinder 15, and a fitting portion 30b that is fitted on the inner surface of the light-transmitting cylinder 15. The end face of the fitting part 30b is formed in an equilateral triangle in accordance with the end face shape of the inner surface of the translucent tube 15.

  FIG. 2 shows a state in which the light emitting device 10 is viewed from the AA line direction of FIG. Light emitting diodes 20 formed in a single chip are mounted in two rows in the longitudinal direction on the inner surface of the light transmitting plate 12b. A pair of wiring patterns 14 a and 14 b is formed on the light transmitting plate 12 b for each mounting position of the light emitting diode 20. One wiring pattern 14a is connected to, for example, a positive pole of a power source that applies a predetermined voltage to the light emitting diode 20, and the other wiring pattern 14b is connected to a negative pole of the power source. In this embodiment, since the light emitting diodes 20 are arranged in two rows, two pairs of wiring patterns 14a and 14b are arranged in the longitudinal direction of the light transmitting plate 12b, that is, four wiring patterns 14a on the inner surface of the light transmitting plate 12b. 14b is provided.

One wiring pattern 14 a has one end extending to one end edge of the translucent tube 15, while the other end of the wiring pattern 14 a is provided away from the other end edge of the translucent tube 15. . The other wiring pattern 14 b is provided such that one end is separated from one end edge of the translucent tube 15 and the other end extends to the other end of the translucent tube 15.
As described above, the positional relationship of the one wiring pattern 14a and the other wiring pattern 14b with respect to the both end edges of the light transmitting tube 15 is set by electrically connecting the lid 30 with the power supply and the wiring patterns 14a and 14b. This is because it is used as an electrode to be connected.

That is, with respect to one end edge portion of the translucent tube 15, by attaching the lid 30 to the translucent tube 15, the fitting portion 30b of the lid 30 overlaps with one wiring pattern 14a, and the other wiring pattern. 14b does not overlap. About the other edge part of the translucent cylinder 15, by mounting | wearing with the lid | cover 30, the insertion part 30b of the lid | cover 30 overlaps only with the other wiring pattern 14b.
If the lid 30 is formed of a conductor material such as copper, for example, the fitting portion 30b is inserted into the light-transmitting tube 15 from the edge of the light-transmitting tube 15 so that the fitting portion 30b is connected to the wiring patterns 14a and 14b. The one wiring pattern 14a is electrically connected to one electrode 30 and the other wiring pattern 14b is electrically connected to the other electrode 30.
A spring-like contact terminal that contacts the wiring patterns 14 a and 14 b is provided in the fitting portion 30 b of the lid 30, and when the lid 30 is attached to the end edge of the translucent tube 15, the contact terminals are connected to the wiring patterns 14 a and 14 b. It is also possible to form the wiring patterns 14a, 14 and the lid 30 so as to be electrically connected by being pressed.

  In the present embodiment, the lid 30 attached to the translucent tube 15 is used as an electrode for electrically sealing the open end surface of the translucent tube 15 and the power source and the light emitting diode 20. It is a feature. The wiring patterns 14a and 14b provided on the light-transmitting plates 12a, 12b and 12c have one electrode (for example, a cathode electrode) of the light-emitting diode 20 for one cover 30 when the cover 30 is attached to the light-transmitting cylinder 15. The other lid 30 may be electrically connected and may be patterned so that the other electrode (anode electrode) of the light emitting diode 20 is electrically connected.

In the light emitting device 10 shown in FIG. 2, the light emitting diode 20 and the wiring patterns 14a and 14b are electrically connected by wire bonding. That is, each of the light emitting diodes 20 mounted on the translucent plate 12b has one electrode (for example, a cathode electrode) and one wiring pattern 14a wire-bonded, and the other electrode and the other wiring pattern 14b are wire-bonded. Bond.
FIG. 3 shows a state where the light emitting diode 20 is mounted on the light transmitting plate 12a and wire-bonded. Since the wiring patterns 14a and 14b are formed in advance on the translucent plate 12a, the light emitting diode 20 is arranged on the translucent plate 12a with the orientation of the cathode electrode and the anode electrode, and the cathode electrode of the light emitting diode 20, Wire bonding is performed between the anode electrode and the wiring patterns 14a and 14b.

  Each of the translucent plates 12a, 12b, and 12c is formed in the same shape, and the light emitting diode 20 is mounted on each of the translucent plates 12a, 12b, and 12c in the same manner. Since the translucent plate is formed in a plate body, in order to form the wiring patterns 14a and 14b on the translucent plate, a method of forming a wiring pattern in a general wiring board manufacturing process, for example, a conductor layer is used. It can be easily formed by an etching method. Further, the required wiring patterns 14a and 14b can be formed by a method such as applying or printing a translucent conductive material in a predetermined pattern.

  Further, it is possible to mount the light emitting diode 20 on a light transmitting plate formed as a flat plate and to electrically connect the wiring patterns 14a and 14b and the light emitting diode 20 by wire bonding. In FIG. 3, the light emitting diodes 20 are arranged vertically and horizontally and the wiring patterns 14 a and 14 b are formed as a common wiring pattern connected to the cathode electrode and the anode electrode of the light emitting diode 20. It is also possible to arrange the wiring patterns so that these wiring patterns and the fitting portions 30b provided on the lid 30 are electrically connected. Further, the light emitting diodes 20 may be arranged in an arbitrary arrangement instead of a matrix arrangement, and may be formed as a routing pattern without providing a wiring pattern linearly.

When assembling the light emitting device 10, the three translucent plates on which the light emitting diodes 20 are mounted are combined, and the oblique cut portions 121 are bonded together to assemble the translucent tube 15 on which the light emitting diodes 20 are mounted, The lid 30 is sealed to the end of the light tube 15. The translucent tube 15 is more visually appealing when viewed as a transparent appearance. Therefore, the oblique cut portions 121 of the translucent plates 12a, 12b, and 12c are preferably joined using a transparent adhesive.
In this way, the light emitting device 10 in which the light emitting diode 20 mounted inside the translucent tube 15 and the lid 30 acting as an electrode are electrically connected in accordance with the polarity of the light emitting diode 20 is assembled.

FIG. 4 is a view of the translucent tube 15 as viewed from the end surface direction in a state where the light emitting device 10 is assembled. A light emitting diode 20 is mounted on the inner surface of each of the translucent plates 12a, 12b, 12c. The light emitting diode 20 is mounted with the light emitting surface facing the inside of the translucent tube 15.
In this light emitting device 10, by applying a required voltage for causing the light emitting diode 20 to emit light between the lid 30 attached to one end of the translucent tube 15 and the other end, the direction of the arrow in the figure, that is, the light emitting diode. Light is emitted toward the translucent plate facing the translucent plate on which 20 is mounted.

The light radiated from the light emitting diode 20 toward the opposing light transmitting plate is transmitted through the light transmitting plate and viewed from the outside of the light transmitting tube 15. The projection light from the light emitting diode 20 is reflected and scattered by the inner surface of the light transmitting cylinder 15 and light is also reflected from each light emitting diode 20 in the lateral direction. It appears that light is emitted from the entire outer surface of the light tube 15.
Since the light emitting diodes 20 are provided with various projection light products such as red, yellow, green, and blue, by appropriately setting the color arrangement of the light emitting diodes 20 mounted on the light transmitting plates 12a, 12b, and 12c. Thus, the light emitting device 10 having various decorative effects can be obtained. In addition, the arrangement of the light emitting diodes 20 on the light transmitting plates 12a, 12b, and 12c can be variously set in consideration of the color design, and the number of the light emitting diodes 20 can be appropriately selected. In addition, dimensions such as the length and thickness of the translucent plates 12a, 12b, and 12c can be appropriately selected, and the translucent plate can be made of a colorless or colored transparent material.

  In the above example, the light emitting diode 20 and the wiring patterns 14a and 14b are electrically connected by wire bonding. However, the light emitting diode 20 can be mounted on the light transmitting plates 12a, 12b, and 12c by flip chip connection. FIG. 5 shows an example in which the light emitting diode 20 is mounted on the light transmitting plates 12a, 12b, and 12c by flip chip connection. The configuration of the translucent tube 15 is the same as that in the above embodiment. When the light emitting diode 20 is flip-chip connected, the light emitting surface of the light emitting diode 20 faces the light transmitting plates 12a, 12b, and 12c on which the light emitting diode 20 is mounted. Therefore, the light emitted from the light emitting diode 20 passes through each of the light transmitting plates 12a, 12b, 12c on which the light emitting diode 20 is mounted and is emitted to the outside of the light transmitting cylinder 15.

Also in this case, light is emitted from the light emitting diode 20 also in the lateral direction, light scattering occurs in the light transmitting tube 15, and when the light emitting device 10 is viewed from the outside, light is emitted from the entire surface of the light transmitting tube 15, The entire surface of the translucent tube 15 is visually recognized as shining.
As a method for increasing light scattering by the light-transmitting tube 15, a method of forming a scattering groove on the inner surface of the light-transmitting tube 15 is also effective. It is also effective to form the inner surface of the translucent tube 15 with an uneven surface or to form the inner surface of the translucent tube 15 with a rough surface. In addition, if a transparent material is used as the wiring patterns 14a and 14b, the wiring patterns 14a and 14b are not easily seen from the outside, and the light emitting device has a good appearance.

  Further, as the light-emitting diode 20 mounted on the light-emitting device 10, a chip having a large power and a large calorific value may be used. In such a case, a method of filling the translucent tube 15 with a cooling liquid such as water and sealing the translucent tube 15 with the lid 30 is effective. When assembling such a light emitting device, after the light emitting diode 20 is mounted on the light transmitting plates 12a, 12b and 12c, the light emitting diode 20 and the wiring patterns 14a and 14b are covered with a light transmitting resin or the like. A cooling liquid such as water is filled, and the lid 30 is attached to the edge of the translucent tube 15 by sealing and sealing.

In this case, if the lid 30 is formed of a material having good heat dissipation such as copper, thermal convection is generated in the liquid filled in the light-transmitting cylinder 15 to cause thermal diffusion, and heat dissipation from the lid 30. As a result, the heat dissipating property of the light emitting device 10 can be improved, and even the high power light emitting diode 20 can be mounted.
Note that attaching the lid 30 formed of a material having good heat dissipation such as copper is effective even when the liquid for cooling is not filled in the translucent tube 15.
Moreover, the lid | cover 30 should just be what can match and connect electrically with the light emitting diode 20 mounted in the translucent cylinder 15, and does not necessarily have to make a base material a metal material. For example, it is also possible to provide a connection part electrically connected to the wiring patterns 14a and 14b and a connection electrode electrically connected to the connection part and connected to a power source using a resin material as a base material.

(Other embodiments)
In the light emitting device 10 of the above embodiment, the translucent tube 15 is formed using the three translucent plates 12a, 12b, and 12c, but the method of forming the translucent tube is not limited to the above example. In other words, the end face shape of the translucent tube can be an arbitrary polygon by combining three or more translucent plates.

FIG. 6 shows another example of a translucent cylinder formed by combining translucent plates. 6A shows an example in which the light-emitting diode 20 is mounted on a light-transmitting tube 15a having a quadrangular end surface formed by combining four light-transmitting plates 12. FIG. 6B shows five light-transmitting plates. FIG. 6C shows an example in which the light emitting diode 20 is mounted on a light-transmitting cylinder 15b having a pentagonal end surface shape formed by combining the plates 12, and FIG. 6C shows an end surface shape having six end surfaces formed by combining six light transmitting plates 12. An example in which the light emitting diode 20 is mounted on a rectangular translucent tube 15c is shown.
In any of the translucent tubes 15a, 15b, and 15c, an oblique cut portion 121 is formed on the side edge of the translucent plate 12, and the oblique cut portion 121 is combined as a butt. In this way, instead of abutting the oblique cut portions to form the light transmitting tube, it is also possible to configure the light transmitting tube by abutting the side end surface of the light transmitting plate against the plane of the adjacent light transmitting plate.

In each of the illustrated light emitting devices, the light emitting surface is directed to the inner surfaces of the light transmitting tubes 15a, 15b, and 15c, and the light emitting diodes 20 are mounted on the light transmitting plates 12 by wire bonding. It is of course possible to mount the light emitting diode 20 by flip chip connection as shown in FIG.
In FIG. 6C, a V-groove 16 is provided on the inner surface of the translucent plate 12 so that the emitted light from the light emitting diode 20 is more strongly scattered on the inner surface of the translucent tube 15c.

In each of these embodiments, the outer shape of the lid portion 30a is formed to match the end surface shape of the light transmitting tubes 15a, 15b, 15c, and the end surface shape of the fitting portion 30b is set to the inner surface of the light transmitting tubes 15a, 15b, 15c. What is necessary is just to use what was formed according to the end surface shape.
The translucent tubes 15a, 15b, and 15c shown in FIG. 6 are all examples formed in a regular polygon shape, but can also be formed in polygons having different side lengths.

  In each of the light-emitting devices 10 described above, a light-transmitting cylinder is formed by combining the light-transmitting plates 12, a light-emitting diode 20 is mounted on the inner surface of the light-transmitting cylinder, and projection light from the light-emitting diode 20 passes through the light-transmitting plate. The feature is that it is visible from the outside. Thus, by mounting the light emitting diode 20 in the internal space surrounded by the light transmitting plate 12, there is an advantage that the light emitting diode 20 can be reliably protected without directly touching the light emitting diode 20 from the outside. There is. Moreover, since the projection light from the light emitting diode 20 is visually recognized as light transmitted through the light transmitting plate 12, a more decorative light emitting action is obtained as compared with the case where the light emitted from the light emitting diode 20 is visually recognized as it is. be able to.

  Further, in the light emitting device according to the present invention, an arbitrary number of light emitting diodes 20 can be mounted, and the mounting position of the light emitting diodes 20 can be freely set, so that it can be provided as a light emitting device capable of various variations. Is possible. Thus, the display can be used not only for decoration but also for various purposes. Moreover, the light-emitting device according to the present invention can be provided as a light-emitting device that can visually recognize the projected light from any position outside the light-transmitting tube and can see the light from the other surface.

1 is an assembled perspective view illustrating a configuration of a first embodiment of a light emitting device according to the present invention. It is the sectional view on the AA line of FIG. It is a top view of the state which mounted the light emitting diode in the translucent board. It is an end view of the translucent cylinder in which the light emitting diode is mounted. It is an end view of the translucent cylinder in which the light emitting diode is mounted. It is an end elevation which shows the other example of the translucent cylinder | tube with which the light emitting diode is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light-emitting device 12, 12a, 12b, 12c Translucent board 14a, 14b Wiring pattern 15, 15a, 15b, 15c Translucent cylinder 20 Light emitting diode 30 Lid 30a Lid part 30b Insertion part

Claims (9)

A translucent plate on which light emitting diodes are mounted is formed by combining three or more translucent plates with the surface on which the light emitting diodes are mounted on the inner surface side, and lids are attached to both edge portions of the translucent tubes. A light emitting device formed,
A lid attached to one end edge of the translucent tube is electrically connected to one electrode of a light emitting diode mounted on the translucent plate, and attached to the other end edge of the translucent tube The light-emitting device, wherein the lid is electrically connected to the other electrode of the light-emitting diode mounted on the translucent plate. The translucent plate is provided with a wiring pattern electrically connected to one electrode of the light emitting diode, and a wiring pattern electrically connected to the other electrode of the light emitting diode,
The lid attached to one end edge of the translucent tube is electrically connected to a wiring pattern electrically connected to one electrode of the light emitting diode,
The lid attached to the other end edge of the light-transmitting tube is electrically connected to a wiring pattern that is electrically connected to the other electrode of the light emitting diode. Light-emitting device.   3. The light emitting device according to claim 2, wherein the wiring pattern is provided as a common wiring pattern for a plurality of light emitting diodes. The lid includes a lid portion that covers an end surface of the translucent tube, and an insertion portion that is formed in an end surface shape that matches the end surface shape of the inner surface of the translucent tube,
By fitting the fitting portion into the inner surface of the light transmitting tube, the wiring pattern and the connection portion provided in the fitting portion are electrically connected, and the light emitting diode and the lid are electrically connected. The light emitting device according to claim 2, wherein the light emitting device is a light emitting device.   The light emitting device according to claim 4, wherein an outer shape of an end surface of the lid portion is formed to match an outer shape of an end surface of the translucent tube.   The lid is made of a conductive material, and is formed as a connection portion that is electrically connected to the wiring pattern, and a connection electrode that is electrically connected to a power source that applies a voltage to the wiring pattern. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device.   The light emitting device according to claim 1, wherein the light emitting diode and the wiring pattern are electrically connected by wire bonding.   The light emitting device according to claim 1, wherein the light emitting diode and the wiring pattern are electrically connected by flip chip connection.   The light-emitting device according to claim 1, wherein the light-transmitting tube is filled with a cooling liquid, and the through-hole tube is hermetically sealed by the lid.

Images