JP2007049038A - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a gap from occurring between a lead wire and a light emitting device due to the bending of the lead wire which is extracted outside the light emitting device in the light emitting device in which a solid-state light emitting device serve as a light source. <P>SOLUTION: The light emitting device includes an LED 1 that serves as a light source, a plurality of lead wires 2 connected to the LED 1, and a resin molding 3 which is configured by sealing up the LED 1 and a part of the lead wires 2 with resin material. The sides of the resin molding 3 through which the lead wires 2 are extracted outside are provided with projections 4 projecting from the resin molding 3 so as to cover the roots of the lead wires 2, and at least one or more constrictions 4a are provided to each of the projections 4 in a circumferential direction so as to buffer the stress induced by the bending of the lead wires 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light emitting device using a solid light emitting element as a light source.

  One of the typical advertising means using conventional lighting is a neon sign. Neon signs can be dynamically displayed with various changes by electrically controlling the timing of lighting and flashing when displaying advertisements with multiple characters arranged, but they are not easy to manufacture. In addition, production costs, capital investment, and power costs are high.

  Thus, a light-emitting device that can easily produce advertisements that are rich in changes due to lighting such as neon signs and that can reduce power consumption is provided (see Patent Document 1). In this light emitting device, a plurality of light sources using light emitting diodes (hereinafter referred to as LEDs) as light emitting elements are connected in series with a plurality of lead wires, for example, as illumination of characters on advertising billboards. is there.

The bean light source is a bullet-type LED filled with a translucent resin with improved light diffusivity, such as by kneading a fine powder such as silica into a transparent or translucent small container whose two opposing sides form a trapezoid. Is molded and sealed with a resin molded body. A plurality of the bean light sources are connected in series with a lead wire, and an electrical connector is attached to one end of the lead wire to form a chain. Thus, the light-emitting device formed in the chain shape is used for, for example, an advertisement display in which a plurality of characters are arranged like a neon sign.
JP 2003-84694 A

  However, in the conventional light emitting device, at the location where the lead wire is drawn out from the light source, the lead wire is bent up and down and left and right to create a gap at the root portion of the lead wire, and the gap is widened so that water etc. However, there was a problem that it entered the inside of the bean light source and caused failure.

  The present invention has been made in view of the above points, and an object thereof is to prevent a gap from being generated between a lead wire and a resin molded body.

  In order to achieve the above object, a first aspect of the present invention is to mold a solid state light emitting device as a light source, a plurality of lead wires connected to the solid state light emitting device, and a part of the solid state light emitting device and the lead wire with a resin material. A projecting portion projecting from the resin molded body so as to cover the base of the lead wire on the surface from which the lead wire of the resin molded body is drawn, and at least one in the circumferential direction of the projecting portion. There are more constrictions.

  According to a second aspect of the present invention, in the first aspect of the present invention, the protrusion includes an engagement groove that is detachably engaged with an engagement piece provided on an attachment member to which the light emitting device is attached. It is provided in the circumferential direction of the protruding portion and is located closer to the resin molded body than the constriction.

  According to the first aspect of the present invention, the surface of the resin molded body from which the lead wire is drawn is provided with a protruding portion protruding from the resin molded body so as to cover the base of the lead wire, and at least one place in the circumferential direction of the protruding portion. By providing the above-described constriction, even if the lead wire is bent vertically and horizontally, the protrusion also bends in accordance with the bending of the lead wire, so the stress caused by the bending is absorbed by the constriction, and the lead wire and the protrusion Adhesion can be maintained. Therefore, a gap is formed between the lead wire and the protruding portion, and water or the like can be prevented from entering from the gap.

  According to the second aspect of the present invention, since the engagement groove that is detachably engaged with the engagement piece provided on the attachment member is provided on the side closer to the resin molded body than the constriction in the circumferential direction of the protrusion. When attaching the light emitting device to the attachment member, the light emitting device can be easily fixed and positioned simply by engaging the engagement groove with the engagement piece of the attachment member. In addition, since the engagement groove is positioned closer to the resin molded body than the constriction, even if the light emitting device is attached to the attachment member, the constriction bend is not hindered.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. The present embodiment is a light-emitting device using a solid-state light-emitting element, in which a solid-state light-emitting element serving as a light source, a plurality of lead wires 2 connected to the solid-state light-emitting element, and a part of the solid-state light-emitting element and the lead wire 2 are provided. And a resin molded body 3 molded by a resin material, and a protruding portion that protrudes from the resin molded body 3 so as to cover the root of the lead wire 2 on the surface from which the lead wire 2 of the resin molded body 3 is drawn. 4, and a plurality of constrictions 4 a are provided in the circumferential direction of the protrusion 4. Further, in the circumferential direction of the protrusion 4, an engagement groove 4 b that engages with an engagement piece 5 a provided on the attachment member 5 for attaching the light emitting device is provided on the side closer to the resin molded body 3 than the constriction 4 a. Provided.

  The solid light emitting element emits light by applying a DC voltage in a specified direction, and the LED 1 is used in this embodiment. However, the LED 1 is not limited as long as it is a solid light emitting element, and for example, an organic EL element or the like may be used. The LED 1 is mounted on the land of the substrate 6 on which the land and the conductor pattern are printed by soldering by reflow soldering or the like. Further, an acrylic plate 7 having high light diffusibility is placed on the light emitting surface of the LED 1 in order to increase the light emission efficiency.

  The lead wire 2 is formed by coating a conductor such as a copper wire with an insulator such as vinyl chloride. In this embodiment, there are two lead wires 2, one end of one lead wire 2 is electrically connected to the anode of the LED 1 through a land and a conductor pattern on the substrate 6, and the other end is a resin molded body. 3 is pulled out to the outside and connected to another light emitting device or an external power source. One end of the other lead wire 2 is electrically connected to the cathode of the LED 1 via a land on the substrate 6 and a conductor pattern, and the other end is drawn out of the resin molded body 3 to be connected to another light emitting device or Connected to external power supply.

  The resin molded body 3 is formed in a substantially rectangular parallelepiped shape by molding a part of the LED 1, the substrate 6, and the lead wire 2 using a resin material such as an epoxy resin, for example. In addition, a substantially circular light extraction hole 3 b for extracting light emitted from the LED 1 to the outside of the resin molded body 3 is provided on a surface facing the light emitting surface of the LED 1.

  The projecting portions 4 are formed in a substantially truncated cone shape so as to project from the resin molded body 3 on the two opposing surfaces of the resin molded body 3 from which the lead wire 2 is led out, and the lead wire 2 is pulled out. The base is covered so that no gap is formed between the lead wire 2 and the resin molded body 3. Two constrictions 4 a and 4 b are formed in the circumferential direction of each protrusion 4 to absorb stress on the protrusion 4 caused by the movement of the lead wire 2. In the present embodiment, the constriction 4b located closer to the resin molded body 3 also serves as an engagement groove 4b that is detachably engaged with the engagement piece 5a of the attachment member 5.

  The mounting member 5 is made of a flat metal plate, and a plurality of engaging pieces 5a are provided at equal intervals on both sides in the longitudinal direction of the metal plate (see FIG. 2). On each side in the longitudinal direction of the metal plate, a substantially circular engaging hole 5b is formed between the engaging piece 5a and the engaging piece 5a so that the protruding portion 4 of the light emitting device can be accommodated. The width in the left-right direction in FIG. 2 is narrow so that the upper side in FIG. 2 does not escape from the state in which the protrusion 4 is engaged. In the present embodiment, a metal plate is used as the attachment member 5, but it is not necessarily limited to metal, and may be formed of other materials such as rubber.

  When the light emitting device is attached to the attachment member 5, the protrusion 4 of the resin molded body 3 of the light emitting device is pressed against the engagement hole 5b of the attachment member 5, so that the engagement groove 4b of the protrusion 4 is engaged with the engagement hole 5b. Is engaged and engaged with the engaging piece 5a standing up and down.

  With the configuration described above, even if the lead wire 2 is bent vertically and horizontally, the constriction 4a also bends in accordance with the bending of the lead wire 2, so that the constriction 4a absorbs the stress caused by the bending, and the lead wire 2 And the protrusion 4 can be kept in close contact. Accordingly, there is no gap between the lead wire 2 and the protruding portion 4, and water or the like can be prevented from entering the light emitting device through the gap. Further, when the light emitting device is attached to the attachment member 5, the light emitting device can be easily fixed by simply engaging the engaging groove 4b of the protrusion 4 with the engaging piece 5a of the attaching member 5, and positioning of the light emitting device is also possible. It can be performed simply. Since the engagement groove 4b is positioned closer to the resin molded body 3 than the constriction 4a, the engagement groove 4b does not hinder the bending of the constriction 4a even if the light emitting device is attached to the attachment member 5. It can be used without losing the effect of 4a.

It is a figure which shows the light-emitting device of embodiment of this invention, (a) is a top view, (b) is sectional drawing. It is a figure which shows the attachment member in the light-emitting device of embodiment of this invention, (a) is the figure which looked at the engagement piece from the front, (b) looked at the engagement piece when the light-emitting device was attached from the front. FIG.

Explanation of symbols

1 LED (solid state light emitting device)
2 Lead wire 3 Resin molded body 4 Protruding part 4a Constriction 4b Engaging groove (constriction)
5 Mounting member 5a Engagement piece

Claims (2)

  A solid light-emitting element serving as a light source, a plurality of lead wires connected to the solid light-emitting element, and a resin molded body obtained by molding a part of the solid light-emitting element and the lead wire with a resin material. A light-emitting device comprising a protrusion protruding from a resin molded body so as to cover the base of a lead wire on a surface from which a wire is drawn, and at least one constriction in the circumferential direction of the protrusion.   The protrusion includes an engagement groove that is detachably engaged with an engagement piece provided on an attachment member to which the light emitting device is attached. The engagement groove is provided in the circumferential direction of the protrusion, and is more resin than constriction. The light-emitting device according to claim 1, wherein the light-emitting device is located on a side closer to the molded body.

Images