JPS6246292Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a light emitting display device using a light emitting diode (LED) as a light source.

Conventionally, as shown in FIG. 1, in this type of light emitting display device, a light emitting body 45 to which an LED chip 44 is attached is fitted into a recess 47 of a condensing body 46 made of, for example, epoxy resin and bonded together. things are provided.

However, in this case, the light emitter 45 and the condenser 4
6 using an adhesive, there is a drawback that air at the interface has nowhere to escape, resulting in the generation of air bubbles and a reduction in the brightness of the entire light emitting surface 48. The bubbles tend to expand as the adhesive layer between the light emitter 45 and the light collector 46 becomes thinner.

Further, when a thermosetting epoxy resin is used as the light condenser 46, there is a drawback that the molding time is long and the cost is high.

Therefore, when thermoplastic acrylic resin is used, the molding time is shortened, but it has the drawback that "sink" occurs in the center of the light emitting surface 48, and the peripheral part of the light emitting surface 48 becomes dark due to this "sink". There is.

The present invention was developed in view of the above-mentioned drawbacks of the conventional light emitting surface, and in order to suppress the decrease in brightness of the entire light emitting surface and increase productivity, even if thermoplastic resin is used, the periphery of the light emitting surface remains dark. The purpose of the present invention is to provide a light-emitting display device with no problems.

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

FIG. 2 shows an exploded view of an illuminated push button switch using a light emitting display device according to the present invention, which roughly consists of a case, an operating section removably attached to the top of the case, and It is roughly divided into a switch part that is fixed to the lower part of the case.

The case 1 is made of synthetic resin and has a square cylindrical shape with a flange exposed on the mounting board at the front end.
Furthermore, mounting leaf springs 2, 2 are attached to the side surfaces thereof.

The switch part is of a type that operates two contact mechanisms in an alternate or momentary manner. 3, 3 is a terminal block in which a normally closed terminal, a normally open terminal, and a common terminal are press-fitted into each contact; 4, 4
is a movable contact piece incorporated into the terminal blocks 3, 3,
Reference numeral 5 denotes an operating piece for operating the movable contact pieces 4, 4, and this operating piece 5 is rotatably supported by a fulcrum protruding to both sides that fits into a recess formed in the terminal blocks 3, 3. At the same time, coil springs 6, 6 are stretched between the protrusion at the tip and the movable contact pieces 4, 4, and when the protrusion is pressed, the movable contact pieces 4, 4 engage in snap action. (3rd
(see figure).

Reference numeral 7 denotes an LED terminal block into which terminals to be connected to a light emitting display device (to be described later) are press-fitted. A contact piece 8 with spring properties is placed in the center of the part, and a contact piece 9 with spring properties is placed on one side in a dogleg shape and has spring properties. There is. 10
is a sliding piece that moves up and down along a guide (not shown) provided on the inner surface of the case 1, and a cam groove for an alternate mechanism is formed on the side surface. The terminal blocks 3, 3 and the LED terminal block 7 are brought into close contact with each other by fitting the protrusions and recesses provided on the side surfaces thereof, and the sliding piece 10 is supported in the cutout of the flat part of the LED terminal block 7, so that the switch can be operated. forming a section;
This switch part is inserted from the bottom of the case 1,
In addition, a protrusion (not shown) inside the case 1 and a side surface of the terminal block are engaged with each other and fixed to the lower part of the case 1. Reference numeral 11 is a spring for the alternate mechanism, and when its tip moves through the cam groove, it becomes an alternate system, and if this spring is removed, it becomes a momentary system, and you can select and use either system. I can do it.

In the operation section, the push button 12 is molded from a white translucent resin, and characters can be written on its surface if necessary, and from its two sides,
The leg pieces 13, 13 are held by sandwiching the guide recess of the LED holder, which will be described later, and are guided so as to be able to slide for a certain distance. A protrusion 14 is formed.

Reference numeral 15 denotes a light emitting display device (see FIGS. 5 to 7) comprising a light emitter 16 and a condenser 39. The light emitting body 16 has a substantially annular lead 17 as shown in FIG.
A total of four LED chips 32 and a resistor 33 are attached to each lead of the lead frame 43, which is wired with a wire 34, and is integrally molded with epoxy resin at low pressure. Frame 43 including holding piece 35 along dashed line A
It is cut off. Figure 8 shows the case for 5V where the LED chip 32 and resistor 33 are connected as shown in Figure 11 A, and Figures 9 and 10 are connected as shown in Figure 11 B and C, respectively. These are for 15V and 24V, respectively. In other words, the lead frame can be shared by simply changing the wiring and cutting positions as appropriate. Note that in the case of 24V, the resistor 33 is not necessary. This low antibody 33 is provided so that the current distribution to each LED chip 32 does not become unbalanced, and eliminates fluctuations in the light emission state.
In addition, it prevents damage caused by thermal runaway due to current concentration. The annular lead 17 of the lead frame has a function as a heat sink. Regarding the two terminals 36 and 37 extending outward from the annular lead, as shown in FIGS. 5 to 7, one terminal 36 is wide and has an engagement hole 38 at the tip,
The terminal 37 is bent downward, and the other terminal 37 is once extended in the lateral direction, and its tip is bent downward. Light collector 39
is made of a transparent thermoplastic resin such as acrylic resin, has a conical surface 39a whose lower part is downwardly tapered, and whose upper end light emitting surface 40 has a rectangular shape. A through hole 4 is formed in the center of the condenser 39, passing through it vertically and gradually becoming smaller in diameter as it goes upward.
1 is provided, and the upper part of the light emitting body 16 is tightly fitted into the bottom of the through hole 41.
By injecting transparent molten resin 42 into the interior and solidifying it, the light emitting body 16 and the light condensing body 39 can be easily connected.
And they are becoming more accurately integrated. Since the light emitting body 16 communicates with the outside air through the through hole 41, the air inside the through hole is pushed upwards by resin injection without any force, bubbles are not generated, and the conical surface 39a of the light collector 39 is reflected. The entire upper surface is used as a light emitting display section. Note that the molten resin 42
In addition to epoxy resin, acrylic resin may also be used. In the state in which the light emitting display device 15 is formed as described above, the LED chips 32 appear diagonally on the light emitting surface 40, and when the LED chips 32 emit light, the light emitting surface 40, which is the upper surface of the condenser 39, has uniform brightness. It's becoming like that.

In FIG. 2, 18 is the light emitting display device 15.
It has a cylindrical part in the center into which the lower part of the light emitting display device 15 fits, and a guide recess 1 on both sides in which the leg pieces 13 of the push button 12 engage.
9 and 19, and snap portions 20 and 20 provided with elasticity by providing notches at two diagonal locations. The holder 18 is also formed with a recess 21 and a through hole 22 into which the terminals 36 and 37 fit from above, and a small hole 22 on the side surface of the recess 21 that engages with the engagement hole 38 of the terminal 36 for positioning. A protrusion (not shown) is provided, and a groove 23 is formed which penetrates from the bottom surface to the bottom surface of the above-mentioned cylindrical portion and has a step so that a contactor, which will be described later, is engaged (see FIG. 3). reference). Reference numeral 24 denotes a printed wiring board (see FIG. 4) in which a resistor 25 and its wiring 26 are printed on a ceramic board having a substantially H shape corresponding to the shape of the LED holder 18, and a slit 27 is bored in the center. The printed wiring board 24 is connected to the groove 23 by passing through the slit 27 and engaging the contact 28 in the groove 23.
It is held in close contact with the back surface of the LED holder 18.
The contactor 28 is made of a conductive metal piece, and has a claw piece 29 at the base end to prevent it from coming off, and has collar pieces 30, 30 projecting to both sides, and the tip is bent into an L-shape. It forms a contact part for the contact piece 8.

The light emitting display device 15, the LED holder 18, the printed wiring board 24, and the contact 28 constitute an LED unit 31, and the push button 12 is fitted into the LED unit 31 to form an operation section, which is further described above. If the switch part is pushed in from the upper part of the case 1 to which it is fixed, the protrusions inside the case 1 and the snap parts 20, 20 will engage and be fixed in a removable manner. At this time, the contact piece 8 contacts the contactor 28, and the contact piece 9 contacts the terminal 36, while the protrusion 14 of the push button 12 contacts the upper end of the sliding piece 10, forming this illuminated push button switch. .

Next, to explain in detail the assembly procedure of the LED unit 31, the printed wiring board 24 is placed on the back side of the LED holder 18, and the contact piece 28 is passed through the slit 27 and the groove 23 of the printed wiring board 24, and then the claw piece 2
9 is locked by the step of the groove 23, and the collar piece 3
0 and 30 hold the printed wiring board 24, and the three are integrated. Next, connect the light emitting display device 15 to the terminal 3
6 and 37 are inserted into the LED holder 18 so that they fit into the recess 21 and the through hole 22, respectively, and are prevented from coming off.
On the lower surface, the tip of the terminal 37 is soldered to one end of the printed wiring 26 as shown in FIG. 4 to establish electrical continuity and to hold the light emitting display device 15. At the same time, the base of the contact 28 is soldered to one end of the printed wiring 26. Solder the other end of 26 and connect the terminal 37 to contact 2.
Conduction is made to 8. Further, one terminal 36 is exposed as it is on the side surface of the LED holder 18 and becomes a contact portion to the contact piece 9.

Therefore, this LED unit 31 can be assembled by simply soldering at three points without using adhesive or the like, and the soldering is also simple.
Since the LED holder 18 and the printed wiring board 24 are already integrated by the contacts 28, this can be done easily. Furthermore, compared to terminals formed by caulking or the like, the contact 28 itself has elasticity and has good contact properties, and does not apply pressure to the printed wiring board 24 unlike caulking. , substrate 2
There is no fear that 4 will break.

If it is necessary to change the emitting color, pull out the push button 12 from the front, and then
It is only necessary to replace the LED unit 31 that is held in the LED unit 3 and pulled out at the same time with an LED unit 31 of a different color, and even if the current characteristics of the light emitting display device 15 are different, a suitable printed resistor 25 can be replaced integrally. This can be done extremely easily, and since the printed resistor 25 is used in place of the conventional resistor, further miniaturization can be achieved.

FIG. 12 shows another embodiment of the light emitting display device according to the present invention, in which a through hole 41 with a large upper end is provided in the condenser 39, and a molten resin 42 is filled in the through hole 41 and solidified. It is something. In this case, the light emitting surface 4 formed by solidifying the molten resin 42
0 is extremely smooth, and the uniformity of the brightness of the light emitting surface 40 is further improved.

Furthermore, in both of the above embodiments, a diffusion layer may be provided in advance on the upper surface of the light emitting body 16, and the light is diffused by this diffusion layer, and synergistically with the light condensing body 39, the light emitting surface 40 The light emitting state of the light is further improved. Further, in the above explanation, a case where thermoplastic resin was used as the light condenser was explained from the viewpoint of cost, but it goes without saying that thermoplastic resin can also be applied.

As is clear from the above explanation, according to the present invention, the lower part of the light condenser made of transparent resin is formed into a conical surface that becomes smaller in diameter toward the bottom, and the through hole passes vertically through the light condenser. The light-emitting body is closely fitted to the bottom of the through-hole, and molten resin is poured into the through-hole to integrate the light-concentrating body and the light-emitting body. Not only is positioning easy, thermoplastic resin can be used for the light concentrator, molding time is shortened and costs can be reduced, and the "sink" on the light emitting surface is absorbed by the above-mentioned through hole, making it possible to reduce costs. This does not occur, and the peripheral edge of the light emitting surface does not become dark. Furthermore, since the molten resin is injected into the through-hole, the air within the through-hole is pushed out and no bubbles are generated, and even if bubbles are generated, they do not expand. Therefore, there is almost no negative effect due to air bubbles, the condensing body is a transparent body, the conical surface on the lower outer surface functions as a reflecting surface, and the light emitting body is tightly fitted into the through hole, allowing the light to flow horizontally. In combination with the absence of directional leakage and the absence of the above-mentioned bubbles, the brightness of the light emitting display section on the upper surface of the condenser can be improved compared to the conventional one.

Furthermore, since the light condenser and light emitter are separate members, as long as the shape of the lower part of the through hole is constant, even if the shape of the light condenser changes due to changes in the shape of the case, etc., a common light emitter can be used. Productivity can be increased.

Furthermore, as described above, when integrating the light condensing body and the light emitting body, positioning can be easily performed, so that the light condensing performance can be made uniform.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of a conventional light emitting display device, Fig. 2 and the following shows the present invention, Fig. 2 is an exploded perspective view of an illuminated push button switch using the light emitting display device according to the present invention, and Fig. 3 is an exploded view of a light emitting display device according to the present invention. 4 is an enlarged view showing the back side of the LED unit, FIG. 5 is a front view of the light emitting display device, and FIG. 6 is a sectional view taken along the line - in FIG. 5.
Figure 7 is a - line sectional view of Figure 5, Figures 8 and 9.
Figure and Figure 10 are for 5V, 12V and 24V, respectively.
11A, 11B and 11C are connection diagrams for 5V, 12V and 24V, respectively, and FIG. 12 is a sectional view of another embodiment of the light emitting display device. 15...Light-emitting display device, 16...Light-emitting body, 17
... Lead, 32 ... LED chip, 33 ... Resistor, 34 ... Wire, 36, 37 ... Terminal, 3
9... Light collector, 39a... Conical surface, 40... Light emitting surface, 41... Through hole, 42... Molten resin, 43...
…Lead frame.

Claims (1)

[Claims for Utility Model Registration] (1) A light-emitting body having a light-emitting element chip mounted on a lead, and a light-emitting body having a light-emitting surface on the upper surface and concentrating light from the light-emitting body on the light-emitting surface. In the light emitting display device, the light condenser is made of a transparent resin, and has a conical surface with a lower part facing downward and becoming smaller in diameter, and a through hole is provided in the light condenser that passes vertically, A light-emitting display device in which a light-emitting portion of the light-emitting body is closely fitted into the bottom of the through-hole, and a transparent molten resin is filled in the through-hole to integrate the light-emitting body and the condenser. (2) The light emitting device according to claim 1 of the utility model registration claim, characterized in that the light emitting surface of the light condenser has a rectangular shape, and four light emitting element chips are arranged so as to appear diagonally on the light emitting surface. Display device. (3) A substantially annular lead is provided integrally with the lead on which a plurality of light emitting element chips are mounted so as to surround the chip, the chips are appropriately wired, and each of the above components is integrally molded. A light-emitting display device according to claim 1 or 2, characterized in that a light-emitting body is constructed by: (4) A request for registration of a utility model characterized in that a wide terminal is integrally extended to the outside of the lead, and the terminal is bent downward so that its side surface is used as a contact portion with an external conductive member. The light emitting display device according to any one of items 1 to 3.