JPH07231117A - Condenser lens of light emitting element - Google Patents

Abstract

PURPOSE:To obtain the rigidly bonded condenser lens, which can be bonded without using a bonding jig, without the entrainment of bubbles in the light emitting element of a large image apparatus. CONSTITUTION:A position fixing pawl 6 is provided at the side of a condenser lens 2. A plurality of bubble removing through holes 7 are provided in the direction of the thickness of the condenser lens 2. Furthermore, a projection 8 for controlling the thickness of a bonding-agent film is provided at the rear surface of the condenser lens 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-screen display device, and more particularly to a condenser lens of a light emitting element which constitutes a pixel of a color display device.

[0002]

2. Description of the Related Art FIG. 14 shows, for example, JP-A-5-205639.
FIG. 15 is a side view showing a condensing lens of the conventional light emitting element shown in Japanese Patent Laid-Open Publication No. JP-A-2003-163, and FIG. 16 is a side view showing an adhesion state of a conventional condenser lens, FIG. 17 is a side view showing a fixing state of a conventional condenser lens with an adhesion jig, and FIG. 18 is a plan view of FIG. Is. In the figure, 1 is a light emitting element body, 2 is a condenser lens,
3 is an adhesive for joining the light emitting element main body 1 and the condenser lens 2, 4 is a bubble entrapped in the adhesive 3 at the time of joining, 5 is the condenser lens 2 fixed to the light emitting element body 1 and aligned It is a bonding jig. The light emitting element body 1 is a so-called composite type in which red, green, and blue phosphors are arranged in a matrix on the inner surface of the light emitting surface, and the condensing lens 2 is a lens as shown in FIG. Correspondingly, the functional lens portions 2a are also formed in a matrix.

Next, the operation will be described. Condensing lens 2
16 is attached to the light emitting element body 1, the adhesive 3 is applied to the adhesive surface (light emitting surface) of the light emitting element body 1 as shown in FIG. Figure 1
7. As shown in FIG. 18, the condensing lens is fixed by the bonding jig 5 so as not to shift, and the alignment is performed. After the adhesive is hardened, the bonding jig 5 is removed to obtain a light emitting element with a condenser lens attached.

[0004]

Since the conventional condensing lens of the light emitting element is configured as described above, the condensing lens 2 itself does not have a function of aligning, and therefore it is bonded to the light emitting element body 1. There is a problem that a bonding jig is sometimes needed and the number of man-hours for bonding work increases. In addition, the bubbles 4 entrapped during the bonding tend to remain in the adhesive, resulting in a bonding defect (air layer).
However, there is a problem in that there is a high possibility that the light emitting element is formed to deteriorate the quality of the light emitting element. This is because, if the adhesion defect extends to the lens portion 2a, not only the brightness is lowered due to the reflection of light, but also the air layer is totally reflected and the color cannot be seen when viewed from an oblique direction.

Further, since the back surface of the condenser lens is a mere flat surface, the problem that the thickness of the adhesive changes instability due to the pressing force at the time of adhesion, and the adhesive is merely a film between flat surfaces. However, there is also a problem that it is difficult to make a strong bond.

As a prior art related to the present invention, for example, there is one disclosed in Japanese Unexamined Patent Publication No. 2-189857. This is provided with a position regulating plate for positioning the condenser lens etc., but this position regulating plate is a separate body from the condenser lens etc., and at least this position regulating plate is a separate component. It has the same problems as the above-mentioned conventional example in that it must be prepared and that the step of attaching the position regulating plate is required.

The invention of claim 1 has been made to solve the above problems, and it is an object of the invention to obtain a condenser lens of a light emitting element which can be easily positioned with respect to the light emitting element body without requiring a separate component. Has an aim.

It is another object of the present invention to obtain a condenser lens of a light emitting element which can eliminate or collect bubbles entrapped during bonding so as not to reach the lens portion.

Furthermore, the invention of claim 9 is to obtain a condenser lens of a light emitting element capable of stabilizing the thickness of the adhesive to an appropriate value.

Further, the invention of claim 2 to claim 3 or claim 10 aims at obtaining a condenser lens of a light emitting element capable of improving the strength against peeling regardless of the performance of the adhesive.

[0011]

A condensing lens of a light emitting element according to the invention of claim 1 is formed so as to extend from the peripheral edge of the lens body to the back side, and when the lens body is bonded to the light emitting element body. A guide is provided which is joined to the side surface of the light emitting element body and positions the lens body in the plane direction with respect to the light emitting element body.

The condensing lens of the light emitting element according to a second aspect of the present invention has a through hole in the thickness direction formed in a portion of the lens body that does not function as a lens.

The condensing lens of the light emitting element according to a third aspect of the present invention is such that irregularities are formed on the inner surface of the through hole in the thickness direction.

According to a fourth aspect of the present invention, there is provided a condenser lens for a light emitting element, wherein the through holes in the thickness direction are formed at a plurality of cross-shaped positions in the plane direction of the lens body.

The condensing lens of the light emitting element according to a fifth aspect of the present invention is one in which a concave portion is formed in a portion of the rear surface of the lens body that does not function as a lens.

According to a sixth aspect of the present invention, there is provided a condensing lens for a light emitting element, wherein a through hole is formed in a plane direction that penetrates from the inner surface of the recess to the side surface of the lens body.

According to a seventh aspect of the present invention, there is provided a condenser lens for a light emitting device, wherein the concave portion is formed by a groove having at least one end reaching a side surface of the lens body.

According to the eighth aspect of the present invention, in the condenser lens of the light emitting element, at least two grooves are formed at positions forming a cross in the plane direction of the lens body.

According to a ninth aspect of the present invention, there is provided a condensing lens for a light emitting element, wherein the back surface of the lens body is provided with three or more protrusions for separating the entire back surface from the light emitting surface of the light emitting element body at the time of bonding.

According to a tenth aspect of the present invention, in the condensing lens of the light emitting element, the projections and depressions are formed on the outer peripheral surface.

[0021]

According to the first aspect of the present invention, when the lens body is bonded to the light emitting element body, the guide is joined to the side surface of the light emitting element body to position the lens body in the plane direction with respect to the light emitting element body.

According to the second aspect of the present invention, the through hole allows the air bubbles trapped during the bonding to escape from the surface of the lens body to the outside.
The bubbles prevent the formation of an air layer in the lens portion. In addition, the through hole causes an anchor effect to strengthen the bonding between the condenser lens and the light emitting element body by allowing the adhesive to flow out to the surface side of the lens body.

The unevenness of the through hole in the invention of claim 3 is
Creates an additional anchoring effect.

According to the fourth aspect of the present invention, the through hole surely and effectively escapes the air bubbles distributed so as to spread from the center to the outside in the plane direction of the lens body at the time of bonding, and an air layer is formed in the lens portion. Reliably stop.

According to the fifth aspect of the present invention, the concave portion collects air bubbles caught during the bonding at a position other than the lens portion and prevents the formation of an air layer in the lens portion by the air bubbles.

According to the sixth aspect of the present invention, the recesses and the through holes collect bubbles trapped at the time of bonding at positions other than the lens portion and let them escape from the side surface of the lens body to the outside.

The groove in the invention of claim 7 collects air bubbles trapped at the time of adhesion at a position other than the lens portion and escapes from the side surface of the lens body to the outside.

According to the groove of the eighth aspect of the present invention, the bubbles distributed so as to spread from the center to the four sides in the plane direction of the lens body are reliably and effectively collected at the time of bonding and escaped from the side surface of the lens body to the outside.

By contacting the light emitting surface of the light emitting element body, the projection according to the ninth aspect of the invention reliably forms and holds a space corresponding to the length between the light emitting surface and the back surface of the lens body. Prevents excessive extrusion of the adhesive due to excessive pressure during adhesion, and stabilizes the adhesive thickness as designed.

The unevenness of the tenth aspect of the invention causes an anchoring effect that strengthens the joint between the condenser lens and the light emitting element body.

[0031]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view showing a condenser lens of a light emitting device according to an embodiment of the invention of claims 1 to 4 and 9 to 10, and FIG. , Fig. 3
[Fig. 3] is a side view of a light emitting device equipped with the condenser lens.
The same members as those of the condensing lens of the conventional light emitting element shown in FIGS. 14 to 18 are designated by the same reference numerals and the description thereof will be omitted. In the figure, 6 is a claw (guide) for fixing and aligning the condenser lens 2 (lens body) to the adhesive surface of the light emitting element body 1, and 7 is a condenser lens 2 for removing bubbles entrapped during adhesion. A through hole with a diameter of 2 mm opened in the thickness direction, 8 is a diameter of 3 m for controlling the thickness of the adhesive 3.
It is a protrusion having a height of 0.5 mm.

Here, each claw 6 has an L-shaped cross section integrally formed with the condensing lens 2 so as to extend from two corners at diagonal positions of the condensing lens 2 to the back surface side in this case. so,
The position dimensions are set so that the inner surfaces are joined to the corners of the light emitting element body 1 at the diagonally opposite ends on the light emitting surface side with a slight gap or a slight interference. Through hole 7
Are formed at a plurality of cross-shaped positions in the plane direction as shown in FIG. 2 so as to avoid the lens portions formed in a matrix, and the inner surface has fine irregularities (for example, like screw threads) over the entire length. Are formed). In this case, the protrusions 8 are cylindrical and are formed at the center position in the plane direction and near the midpoint position of each side, and also form a cross, and fine irregularities are formed on the peripheral surface over the entire length. Has been done.

Next, the operation will be described. Condensing lens 2
In order to bond the light emitting element body 1 to the light emitting element body 1, after applying a sufficient amount of the adhesive 3 to the bonding surface of the light emitting element body 1, the condensing lens 2 is fitted with the claw 6 and the light emitting surface of the light emitting element body 1 Simply push it in and press it with sufficient force. Then, the positioning of the condensing lens 2 in the plane direction is automatically performed by joining the claws 6 without the operator having to be aware of it. Further, since the protrusion 8 is in contact with the light emitting surface of the light emitting element body 1, the distance between the back surface of the condenser lens 2 and the light emitting surface of the light emitting element body 1 (that is, the thickness of the adhesive) is the length of the protrusion 8. (0.5 mm in this case).

Then, in the process of the bonding work or the subsequent solidification process, the air bubbles trapped in the adhesive escape to the outside through the through holes 7 by the pressing pressure or the like.
In particular, it has been confirmed by experiments that ordinary bubbles tend to gather in the central portion in the plane direction of the condenser lens 2 at the time of bonding and spread so as to spread in all directions. It surely escapes to the outside through the hole 7. Further, at the time of the above-mentioned adhesion, the adhesive 3 protrudes through the through holes 7 to the surface side of the condenser lens 2, and as shown in FIG. 3, the protruding portion 9 exerts an anchor effect after solidification.

Therefore, in this embodiment, a good quality light emitting device in which the condenser lens is firmly fixed at an appropriate position, the thickness of the adhesive is appropriate, and the air layer is not formed in the adhesive, It has an effect such that the yield is good and the assembling work is simple and the number of parts is small.

Example 2. Next, another embodiment of the inventions of claims 1 to 4 and claims 9 to 10 will be described with reference to FIGS. FIG. 4 is a side view of the condenser lens of the present embodiment, and FIG. 5 is a view (back view) taken along the arrow A in FIG. In the figure, 6a is a planar claw (guide) formed at the center of each side of the condenser lens 2. This nail 6a
Like the claws 6, is formed integrally with the condenser lens 2 so as to extend to the back surface side of the condenser lens 2, and has an inner surface on each side surface of the light emitting surface side end of the light emitting element body 1. Are positioned so that they are joined with a slight gap or a slight interference. Also in the case of the present embodiment, the condensing lens 2 can be easily positioned and adhered to the light emitting element body 1 by the claw 6a, and the same effect as that of the first embodiment can be obtained.

Example 3. Next, another embodiment of the inventions of claims 1 to 4 and claims 9 to 10 will be described with reference to FIGS. FIG. 6 is a side view of the condenser lens of the present embodiment, and FIG. 7 is a view (back view) taken along the arrow A in FIG. In the figure, 6b is a frame-shaped guide formed on the entire circumference of the condenser lens 2. This guide 6b is formed integrally with the condenser lens 2 so as to extend to the back surface side of the condenser lens 2 as in the case of the claw 6. The dimensions are set so that the inner surface fits around the circumference with a slight clearance or a slight interference. Also in the case of this embodiment, the condensing lens 2 can be easily positioned by the guide 6b and adhered to the light emitting element body 1, and the same effect as that of the first embodiment can be obtained.

Example 4. Next, another embodiment of the inventions of claims 2 and 9 will be described with reference to FIG. In the figure, 7a is a through hole formed in the four corners of the condenser lens 2 in the thickness direction, and 8a is a protrusion for controlling the thickness of the adhesive 3. In this case, no particular unevenness is formed on the through hole 7a or the protrusion 8a. Also in the case of the present embodiment, the bubbles are removed by the through holes 7a, and the thickness of the adhesive 3 is easily maintained at an appropriate value by the protrusions 8a, and the same effect as that of the first embodiment is obtained.

Example 5. Next, an embodiment of the invention of claim 5 will be described with reference to FIGS. In the figure, 1
Reference numeral 0 denotes an oval-shaped concave portion formed in a portion other than the lens portion 2a on the back surface of the condenser lens 2, and in this case, four concave portions are formed in a cross shape in the plane direction.

Next, the operation will be described. Bubbles caught in the adhesive 3 when the condenser lens 2 is bonded to the light emitting element body 1 are collected in the recess 10 due to a difference in specific gravity or the like. In particular,
It has been confirmed by experiments and the like that air bubbles are usually gathered at the central portion in the plane direction of the condenser lens 2 at the time of bonding and are easily distributed so as to spread in all directions from there. However, the air bubbles thus distributed are arranged in a cross shape. It is surely collected in the formed concave portion 10 and does not reach the lens portion 2a. Further, the thickness of the adhesive 3 is easily maintained at an appropriate value by the protrusion 8a. Therefore, according to the present embodiment, a good quality light emitting element in which the thickness of the adhesive is appropriate and the air layer in the adhesive does not exist at least at the position of the lens portion 2a can be obtained with high yield and simple assembling work. It has the effect of being cut.

Example 6. Next, an embodiment of the invention of claim 6 will be described with reference to FIG. In the figure, reference numeral 11 is a through hole in a plane direction formed so as to penetrate from the inner end surface of the recess 10 to the side surface of the condenser lens 2. In the case of the present embodiment, the bubbles collected in the recess 10 at the time of bonding escape to the outside through the through hole 11 due to the pressing pressure or the like. Therefore, the formation of the air layer in the adhesive at the position of the lens portion 2a is further reliably prevented, and the same effect as that of the fifth embodiment is more remarkably realized.

Example 7. Next, an embodiment of the inventions of claims 7 and 8 will be described with reference to FIG. In the figure, 12 is a groove (recess) provided on the back surface of the condenser lens 2 so as to form a cross shape in the plane direction. Both ends of these grooves 12 reach the side surfaces of the condenser lens 2. In this case, the projection 8a is provided at the center of the back surface of the condenser lens 2.
It is arranged so as to avoid the groove 12 and the lens portion 2a at four places and four corners. Also in the case of this embodiment, the air bubbles trapped in the adhesive 3 at the time of bonding are collected in the groove 12 and escaped from the side surface of the condenser lens 2, and the same effect as that of the sixth embodiment is obtained.

Example 8. Next, another embodiment of the inventions of claims 7 and 8 will be described with reference to FIG. In this embodiment, the groove 12 is also formed at a position along each side of the condenser lens 2. In the case of this embodiment, the ability to remove the air bubbles existing in the peripheral portion of the condenser lens 2 is also particularly improved, and the effect similar to that of the sixth embodiment is more remarkably realized.

[0044]

As described above, according to the first aspect of the invention, when the lens body is bonded to the light emitting element body, the lens body is joined to the side surface of the light emitting element body so that the lens body is in the plane direction with respect to the light emitting element body. Since it is configured to be provided with a guide for positioning, the condensing lens can be attached to the light emitting element by a simple operation without using a separate component such as an adhesive jig.

According to the second aspect of the present invention, since the through hole in the thickness direction is formed in the portion of the lens body that does not function as a lens, there is no air layer in the adhesive and the assembly is firmly bonded. There is an effect that the optical lens can be easily obtained.

According to the third aspect of the present invention, since the unevenness is formed on the inner surface of the through hole in the thickness direction, there is an effect that a converging lens having a stronger joint can be obtained.

According to the invention of claim 4, since the through holes in the thickness direction are formed at a plurality of cross-shaped positions in the plane direction of the lens body, the ability to remove bubbles in the adhesive is improved. There is an effect that a high quality light emitting element can be surely obtained.

According to the fifth aspect of the invention, since the concave portion is formed in the portion of the back surface of the lens body that does not function as a lens, there is no air layer in the adhesive at least at the lens portion, which is of good quality. There is an effect that a light emitting element can be easily obtained.

According to the sixth aspect of the present invention, since the through-hole in the plane direction is formed so as to penetrate from the inner surface of the recess to the side surface of the lens body, the ability to remove bubbles in the adhesive from at least the position of the lens section. Is improved, and a high-quality light emitting element can be reliably obtained.

According to the seventh aspect of the present invention, since the concave portion is formed by a groove having at least one end reaching the side surface of the lens body, the ability to remove air bubbles in the adhesive from at least the position of the lens portion is improved, and good quality light emission is achieved. There is an effect that the element can be surely obtained.

According to the eighth aspect of the present invention, since at least two grooves are formed at the cross-shaped positions in the plane direction of the lens body, the bubbles in the adhesive are removed from at least the position of the lens portion. There is an effect that the ability is further improved and a high quality light emitting device can be obtained more surely.

According to the ninth aspect of the invention, since the back surface of the lens body is provided with three or more protrusions for separating the entire back surface from the light emitting surface of the light emitting element body during bonding, the thickness of the adhesive is uniform. Further, there is an effect that a proper light emitting element can be stably obtained.

According to the tenth aspect of the invention, since the projections and depressions are formed on the outer peripheral surface of the projections, there is an effect that a converging lens having a stronger joint can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a condenser lens of a light emitting device according to an embodiment of the inventions of claims 1 to 4 and 9 to 10;

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a side view of a light emitting device equipped with a condenser lens according to an embodiment of the invention of claims 1 to 4 and 9 to 10;

FIG. 4 is a side view of a condenser lens according to another embodiment of the inventions of claims 1 to 4 and 9 to 10;

5 is a view on arrow A in FIG. 4. FIG.

FIG. 6 is a side view of a condenser lens according to another embodiment of the inventions of claims 1 to 4 and 9 to 10;

FIG. 7 is a view on arrow A in FIG.

FIG. 8 is a perspective view of a light emitting device according to another embodiment of the present invention.

FIG. 9 is a back view of a condenser lens according to an embodiment of the invention of claim 5;

FIG. 10 is a side view of a condenser lens according to an embodiment of the invention of claim 5;

FIG. 11 is a back view of a condenser lens according to an embodiment of the invention of claim 6;

FIG. 12 is a back view of a condenser lens according to an embodiment of the inventions of claims 7 and 8;

FIG. 13 is a back view of a condenser lens according to another embodiment of the invention of claims 7 and 8;

FIG. 14 is a side view showing a condensing lens of a conventional light emitting element.

FIG. 15 is a plan view of a condensing lens of a conventional light emitting element.

FIG. 16 is a side view showing a bonding state of a conventional condenser lens.

FIG. 17 is a side view showing a fixing state of a conventional condenser lens with an adhesive jig.

FIG. 18 is a plan view showing a fixing state of a conventional condenser lens with an adhesive jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light emitting element body 2 Condenser lens (lens body) 6 Claw (guide) 6a Claw (guide) 6b Guide 7 Through hole 7a Through hole 8 Projection 8a Projection 10 Recessed portion 11 Through hole 12 Groove (recessed portion)

Claims (10)

[Claims] 1. A condensing lens of a light emitting element, comprising a plate-shaped lens body which is adhered to a light emitting surface of the light emitting element body and condenses light emitted from the light emitting element body, from a peripheral edge of the lens body to a rear surface side. A light emitting device that is formed to extend and has a guide that is joined to a side surface of the light emitting device body when the lens body is bonded to the light emitting device body and that positions the lens body in a planar direction with respect to the light emitting device body. Condensing lens. 2. A condensing lens of a light emitting element, comprising a plate-shaped lens body which is adhered to a light emitting surface of the light emitting element body and condenses light emitted from the light emitting element body, and which functions as a lens of the lens body. A condensing lens for a light-emitting element, characterized in that a through hole in the thickness direction is formed in a non-existing portion. 3. The condensing lens of the light emitting device according to claim 2, wherein the through hole has an unevenness formed on an inner surface thereof. 4. The condenser lens for a light-emitting element according to claim 2, wherein the through holes are formed at a plurality of cross-shaped positions in the plane direction of the lens body. 5. A condensing lens of a light emitting element, comprising a plate-shaped lens body adhered to the light emitting surface of the light emitting element body to collect light emitted from the light emitting element body, wherein the lens is adhered to the light emitting surface. A condensing lens for a light-emitting element, characterized in that a recess is formed in a portion of the back surface of the main body that does not function as a lens. 6. The condenser lens for a light-emitting element according to claim 5, wherein the lens body is formed with a through hole in a plane direction that penetrates from the inner surface of the recess to the side surface of the lens body. 7. The condenser lens for a light emitting device according to claim 5, wherein the recess is a groove having at least one end reaching a side surface of the lens body. 8. The condenser lens for a light emitting device according to claim 7, wherein at least two grooves are formed at cross-shaped positions in the plane direction of the lens body. 9. The back surface of the lens body adhered to the light emitting surface is provided with three or more protrusions that separate the entire back surface from the light emitting surface at the time of adhering. A condensing lens of the light-emitting element according to any one of the above. 10. The condensing lens of a light emitting device according to claim 9, wherein the protrusion has an uneven surface formed on an outer peripheral surface thereof.