JP2002134794A - Optical device for optical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of usage of light being poor because a torus part is present, where no light exits or no incident light reaches a light-receiving element, related to an optical device for an optical element, where with a light reflection member comprising a concave surface, a light-emitting element and a light-receiving element are placed around the center of the light reflection member and the concave part is sealed with a mold resin. SOLUTION: A lens is made to be larger which is provided in a direct outgoing region on the outgoing side of light or in a direct incidence region on the incidence side of light. At the extra part, an interface with an air is provided or a second light reflecting member is provided, thus a torus region where no light exits or it is not received, or is lost from a light-receiving element is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently emitting light emitted from a light emitting element such as a light emitting diode (LED) or a semiconductor laser (LD) or light incident on a light receiving element such as a photodiode or a photoelectric conversion element. The present invention relates to an optical device for an optical element that can be used.

[0002]

2. Description of the Related Art Conventionally, there is a light-emitting device in which a light-emitting element chip such as a light-emitting diode (LED) or a semiconductor laser (LD) is sealed in a shell shape with a mold resin. In such a light emitting element, light emitted forward is emitted as it is, but light emitted obliquely is totally reflected at the interface of the mold resin or scattered inside the case, resulting in loss. Some of them have poor light use efficiency.

[0003] For this reason, the applicant of the present application has filed Japanese Patent Application No. 11-34.
No. 1344, as shown in the cross-sectional view of FIG.
D) and other light-emitting element chips (hereinafter abbreviated as light-emitting elements)
1 has a lead frame 3 mounted on a receiving portion 2 and die-bonded, the other lead frame 5 connected to the light emitting element 1 by bonding wires 4, a light reflecting member 6 provided therearound, and the like. A mold is formed in a central portion on the side to form a direct emission region 7 having a convex lens shape such as a spherical lens shape, an aspherical lens shape, or a parabolic shape, and a total reflection region 8 formed in a plane so as to surround the direct emission region 7. A light emitting device using an optical device for an optical element sealed with a resin 9 has been proposed.

In the light-emitting device shown in FIG. 11, the light-emitting element 1 is located at or near the focal point of the convex lens-like portion of the direct light-emitting area 7, so that the light-emitting element 1 exits the light-emitting element 1 and directly faces the light-emitting area 7. The light is converted into substantially parallel light, and is directly emitted from the front surface of the mold resin 9 to the front as shown in a path 10. On the other hand, the angle α between the direction of the boundary between the direct emission area 7 and the total reflection area 8 and the optical axis of the light emitting element 1
Is set to be equal to or greater than the critical angle of total reflection between the mold resin 9 and the air, and therefore, of the light emitted from the light emitting element 1, Is totally reflected at the interface of the mold resin 9 with the air, further reflected by the light reflecting member 6, becomes almost parallel light, and exits forward from the total reflection area 8. Therefore, in this light emitting device, most of the light emitted from the light emitting element 1 is used as effective light in the direct emission area 7 and the total reflection area 8.
And a very efficient light emitting device can be obtained.

In Japanese Patent Application No. 11-341344, such an optical device for an optical element is used, and a light receiving element such as a photodiode or a photoelectric conversion element is used instead of a light emitting element as shown in FIG. There is also proposed a light receiving device in which is sealed. That is, in FIG. 12, 6 is a light reflecting member, 21 is a direct incident area provided as a convex lens shape such as a spherical lens shape, an aspherical lens shape, or a parabolic shape in the central portion on the light incident side, and 22 is a light incident region. After being reflected by the light reflecting member 6, the light is totally reflected at an interface between the mold resin 9 and the air to form a light receiving element 20 such as a photodiode or a photoelectric conversion element.
These members are sealed with the mold resin 9 in the total reflection area leading to the above.

Light-receiving elements such as photodiodes and photoelectric conversion elements improve sensitivity by increasing the amount of received light for sensing, for example, and increase the amount of electric energy generated by increasing the amount of received light in the photoelectric conversion element. To increase. Therefore, in these light receiving elements, it is desired to make the light receiving surface as large as possible.

[0007] If the intensity of the incident light is the same, the first conceivable method for increasing the amount of received light is to increase the area of the light receiving element. However, in the method of increasing the chip area of the light receiving element, the number of chips obtained from one single crystal wafer is reduced, which leads to a significant cost increase. Also, a lens is placed in front of the light receiving element,
There is also a method of condensing light incident on a lens on a light receiving element.
However, this method requires a large lens and increases the thickness by the distance between the light receiving element and the lens.
There is a problem that the light receiving device becomes large.

However, when an optical device for an optical element as shown in FIG.
Incident on the light path 23 and the like are air and mold resin 9.
The light that is refracted at the interface with the light-receiving element 20 and reaches the light-receiving element 20, while being incident on the total reflection area 22 via the path 24 and the like,
Then, the light is reflected by the total reflection area 22 and reaches the light receiving element 20, and the light incident from a large area can be received although the light receiving surface of the light receiving element itself is small, which is very efficient. A light receiving device can be configured.

An optical device for an optical element, in which the light emitting element 1 and the light receiving element are not sealed and the light emitting member 6 and the molding resin are used to directly form the emission area 7 and the total reflection area 8 and are combined with the light emitting element and the light receiving element. Then, an efficient optical element can be configured by easily combining with various elements.

[0010]

However, FIG.
In the light emitting device shown in FIG. 1 and the light receiving device shown in FIG. 12, the boundary direction between the direct emission region 7 and the total reflection region 8 or the direct incidence region 21 and the total reflection region 22 and the light emitting element 1 Is set to be equal to or greater than the critical angle of total reflection between the mold resin 9 and the air, and the angle α between the optical axis and the optical axis with the light receiving element 20 is set to be equal to or larger than that.
In both the light-emitting device 1 and the light-receiving device of FIG. 12, no light is emitted from the region indicated by 12 in (B), or the light incident on this region does not reach the light-receiving element 20 and the light-emitting surface has a donut shape. There may be a portion that is not shining, and the light emission state looks uneven (FIG. 11), or the light of the path 25 incident on this area is not received by the light receiving element 20 but is emitted again out of the light receiving device and lost. (FIG. 12).

The critical angle is constant depending on the molding resin 9 used, and the total reflection area 8 or 22 of the molding resin 9 cannot be increased in the optical axis direction. It cannot be said that the intensity ratio of the light emitted from the total reflection region 8 or the light incident on the total reflection region 22 is larger than that of the incident light or the light directly incident on the incident region 21.

In view of the above circumstances, in the present invention, the light emitting device does not emit light as indicated by 12 in FIG. 11B, and the light receiving device as shown in FIG. It is an object of the present invention to provide an optical device for an optical element that can efficiently emit or receive light by eliminating the region 12 as shown in FIG.

Further, in the present invention, the total reflection area 8 or 22 is increased in the optical axis direction without being influenced by the critical angle determined by the molding resin 9 used;
It is also an issue to increase the intensity ratio of light emitted from the total reflection area 8 or light incident on the total reflection area 22 than light emitted from the direct emission area 7 or light incident on the direct incidence area 21. is there.

[0014]

In order to solve the above-mentioned problems, according to the present invention, while maintaining the size of the resin interface forming the total reflection area, the lens portion is increased so as to overlap the total reflection area. Or conversely, extend the total reflection area to the optical axis side below the lens part, and make the part where this lens part is enlarged or the part where the total reflection area is extended have an interface with air or have a reflective surface Forming a second light reflecting member, when light reflected from the side closest to the optical axis of the second light reflecting member is reflected by the light reflecting member and emitted forward,
By passing near the outer diameter of the lens portion, a portion where light is not emitted or a region 12 where light is not received by the light receiving element and lost is eliminated. Also, by increasing the size of the second light reflecting member in the optical axis direction and increasing the area reflected by the light reflecting member, the collimation range can be increased,
The light emission characteristics can be controlled by the shape of the reflector, and the intensity ratio of light emitted from the total reflection area 8 or light incident on the total reflection area 22 can be increased.

In order to realize this, according to the present invention, as described in claim 1, an optical device for an optical element for controlling an optical path of outgoing light from an optical element to the outside or incident light from the outside to the optical element. A light reflection member, a total reflection area that covers at least a light reflection surface of the light reflection member, and that totally reflects light outside a predetermined area in front of the optical element at a resin interface, and a light reflection area in front of the optical element. A lens portion that emits or condenses the light that has reached the predetermined area, and a resin that forms the light, the light that has deviated from the predetermined area in front of the optical element, the optical element and the outside of the optical element for an optical element. A light path to be connected passes through at least one of the second light reflecting members provided at the resin interface or the vicinity of the resin interface and a path at least once reflected by each of the light reflecting members. like Serial resin interface, the second light reflecting member,
Alternatively, the arrangement of the light reflecting member is determined, and the shape or arrangement of the lens portion or the second light reflecting member is determined so that light passing near the outer shape of the lens portion passes through the optical path. Features.

As described above, the second light reflecting member is provided at the resin interface, and the path through which light passing near the outer shape of the lens portion is reflected at least once by each of the second light reflecting member and the light reflecting member. As shown in FIG. 11 and FIG. 12B, the donut-shaped light does not exit or the part where the incident light is lost disappears, and the light-emitting device is viewed from the front. There is no unevenness in the light emission state, it looks very beautiful, and it emits light efficiently,
Alternatively, an optical device for an optical element that can receive light can be provided.

In the second light reflecting member, the second light reflecting member is formed on the predetermined region side from the total reflection region, and the second light reflecting member is formed at a critical angle of the resin interface. It is characterized in that light directed toward the resin interface can be reflected at a small angle.

By doing so, the area reflected by the light reflecting member can be increased, the collimating range can be increased, the light emission characteristics can be controlled by the shape of the reflector, and total reflection can be achieved. The intensity ratio of light emitted from the region or light incident on the total reflection region can be increased. Therefore, when it is desired to emit collimated light, it is more effective to control the light with a light reflecting member, so that the effect is large.

Further, the reflecting surface made of the second light reflecting member is characterized in that the reflecting surface made of the second light reflecting member is a half mirror surface.

By doing so, there is no portion where the donut-shaped light does not exit, and the boundary of the light exiting from the resin interface is formed by the light transmitted through the second light reflecting surface constituted by the half mirror. As it is not clear, even when the light emitting device is viewed from the front, there is no unevenness in the light emitting state,
Looks very pretty.

Then, by using the optical device for an optical element configured as described above,
In the vicinity of the center of the light reflecting member, a light emitting element is sealed,
Alternatively, an optical device for an optical element having a high light utilization efficiency and high efficiency can be obtained.

[0022]

Embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. This is just an example.

FIG. 1 is a schematic sectional view of a light emitting device using an optical device for an optical element according to a first embodiment of the present invention. The same components as those in the conventional example shown in FIG. Is attached. In the figure, 1 is a light emitting element, 2 is a receiving portion for mounting and die-bonding the light emitting element 1, 3 is a lead frame, 4 is a bonding wire connecting the light emitting element 1 and the other lead frame 5, 5 is the other lead frame, 6
Is a light reflecting member, 7 is a direct emission area, 8 is a total reflection area, 9
Is a first mold resin which covers the light emitting element 1, the lead frames 3, 5, the light reflecting member 6, etc., and 30 is a convex lens shape such as a spherical lens shape, an aspherical lens shape, a parabolic surface shape, etc. And lens portions 31, 32, and 33 formed to have a size to cover the portion 12 shown as the region from which light is not emitted in FIG. It is a notch of a lens.

Of these, the cut portion 34 is
, That is, the boundary α between the lens portion 30 and the total reflection area 8 and the optical axis of the light emitting element 1 is equal to or larger than the critical angle of total reflection between the mold resin 9 and air. It is set so that the molding resin 9 forming the total reflection area 8 comes into contact with air.

In the light emitting device shown in FIG.
Since the light emitting element 1 is placed at or near the focal point of the lens 30 formed in the direct emission area 7, the light emitting element 1
The light that has exited the optical path and travels to the path 32 is refracted at the interface between the mold resin 9 of the lens portion 30 formed in the direct emission area 7 and the air, is converted into substantially parallel light, and exits from the direct emission area 7. On the other hand, the total reflection area 8 of the path 33 exiting from the light emitting element 1
Is totally reflected at the interface of the mold resin 9 with the air, further reflected by the light reflecting member 6, becomes almost parallel light, and exits forward from the total reflection area 8.

The light that has exited the light emitting element 1 and is directed toward the total reflection area 8 near the boundary between the total reflection area 8 and the lens portion 30, ie, near the angle α from the optical axis, is reflected by the total reflection area 8 and the light reflecting member. The light is reflected at 6 and becomes almost parallel light, and is totally reflected.
When the light is emitted from the lens, the light does not pass through the end of the lens portion 30 formed in the direct emission area 7 and the portion where light is not emitted as indicated by 12 in FIG. Therefore, even when the light-emitting device shown in FIG. 1 is viewed from the front, the light-emitting state has no unevenness and looks very beautiful. In addition, since the distance between the lens unit 30 formed in the direct emission area 7 and the light emitting element 1 is long, the positional accuracy of the light emitting element 1 does not need to be so high, and further, the light distribution characteristics emitted from the lens unit 30 Can have a narrower directivity angle.

FIG. 2 is a schematic sectional view of a light emitting device using the optical device for an optical element according to the second embodiment of the present invention. The lens unit 3 in the first embodiment shown in FIG.
The second light reflecting member is provided by eliminating the 0 cut portion 34 to facilitate molding, and the same components as those in FIG. 1 are denoted by the same reference numerals.

In the drawing, reference numeral 1 denotes a light emitting element, 2 denotes a receiving portion on which the light emitting element 1 is mounted and die-bonded, 3 denotes a lead frame,
Is a bonding wire connecting the light emitting element 1 and the other lead frame 5, 5 is the other lead frame, 6 is a light reflecting member, 7 is a direct emission area, 8 is a total reflection area, and 9 is a light emitting element 1 or the lead frame 3 , 5, a first mold resin covering the light reflecting member 6 and the like, 35, 36, 37 are light paths,
Numeral 38 denotes a direct light emitting area 7 having a convex lens shape such as a spherical lens shape, an aspherical lens shape, a parabolic surface shape, and the like.
A lens portion formed to have a size to cover a portion 12 shown as a region from which no light is emitted in FIG.
8 is a second light reflection member formed between the light reflection area 8 and the total reflection area 8.

The second light reflecting member 39 has a donut shape having a size to cover a portion 12 shown as a region from which light is not emitted in FIG.
And the angle α between the inner diameter and the optical axis of the light emitting element 1 is set so as to be substantially equal to the critical angle of total reflection between the mold resin 9 and air.

By configuring the optical device for an optical element in this manner, the light exiting from the light emitting element 1 and traveling toward the path 36 is transmitted directly to the interface between the mold resin 9 of the lens portion 38 formed in the direct emission area 7 and the air. Light that is refracted and converted into substantially parallel light and exits directly from the emission region 7, while light exiting from the light emitting element 1 and traveling toward the total reflection region 8 of the path 37 is reflected by the second light reflection member 39, The light is reflected by the light reflecting member 6 and becomes substantially parallel light, and is emitted forward from the total reflection area 8.

Then, the boundary portion of the second light reflecting member 39 closer to the optical axis, that is, the light that exits the light emitting element 1 and travels to the total reflection area 8 near the angle α from the optical axis is totally reflected. When the area 8 is reflected by the light reflecting member 6 and becomes substantially parallel light and exits from the total reflection area 8, the light passes through the end of the lens portion 38 formed in the direct emission area 7, and passes through 12 in FIG. There is no portion where the light is not emitted as shown. Therefore, even if the light emitting device shown in FIG. 2 is viewed from the front,
There is no unevenness in the light emission state and it looks very beautiful. Also,
Since the distance between the lens unit 30 formed in the direct emission area 7 and the light emitting element 1 is increased, the positional accuracy of the light emitting element 1 does not need to be so high, and the light distribution characteristics emitted from the lens unit 30 can be further improved. It can be made a narrow pointing angle. Also, as compared with the first embodiment shown in FIG.
As a result, the integral molding can be performed at one time, and the production cost can be substantially the same as that of the conventional product shown in FIG.

FIG. 3 is a view for explaining a procedure for producing the optical device for an optical element according to the second embodiment shown in FIG. First, in FIG. 3A, a resin mold 40 for forming an interface between the mold resin 9 and the lens portion 38 is prepared, and the second light reflecting member 39, the light reflecting member 6, the light emitting element 1 die-bonded to the lead frame 3, and the light emission thereof. The bonding wire 4 connecting the element 1 and another lead frame 5 is inserted and positioned. Then, in FIG. 3B, the mold resin 9 is injected and thermally cured. And in FIG. 3c,
By taking out from the resin mold 40, a light emitting device using the optical device for an optical element of the second embodiment in FIG. 2 shown in FIG. 3D is completed.

In the manufacturing procedure shown in FIG. 3, the second light reflecting member 39 is easily positioned.
As shown by x in FIG. 3A, a step is provided in the resin mold 40, and the second light reflecting member 39 existing between the resin interface and the lens portion 38 protrudes only by x as shown in FIG. 3D. I have. In this way, by forming the optical device for an optical element shown in FIG.
The production cost can be made almost the same as compared with the conventional product shown in FIG.

FIG. 4 is a schematic sectional view of a light emitting device using the optical device for an optical element according to the third embodiment of the present invention. The second light reflecting member 39 in the second embodiment shown in FIG. Is a half mirror, so that boundaries of light emitted from the resin interface are made inconspicuous. 4, the same components as those in FIG. 2 are denoted by the same reference numerals.

In the figure, reference numeral 1 denotes a light emitting element, 2 denotes a receiving portion on which the light emitting element 1 is mounted and die-bonded, 3 denotes a lead frame,
Is a bonding wire connecting the light emitting element 1 and the other lead frame 5, 5 is the other lead frame, 6 is a light reflecting member, 7 is a direct emission area, 8 is a total reflection area, and 9 is a light emitting element 1 or the lead frame 3 , 5, the first mold resin covering the light reflecting member 6 and the like, 35, 36, 41, 42, 43
Is a light path, and 38 is a lens portion formed in the direct emission area 7. This lens portion 38 has a spherical lens shape as described above.
It is formed in a convex lens shape such as an aspheric lens shape or a parabolic surface shape. Reference numeral 44 denotes a second light reflecting member formed by a half mirror between the lens section 38 and the total reflection area 8.

The second light reflecting member 44 has a donut shape large enough to cover a portion 12 shown as a region from which light is not emitted in FIG.
And the angle α between the inner diameter and the optical axis of the light emitting element 1 is set so as to be substantially equal to the critical angle of total reflection between the mold resin 9 and air.

By configuring the optical device for an optical element in this manner, light that has exited from the light emitting element 1 and traveled to the path 36 is transmitted directly to the interface between the mold resin 9 of the lens portion 38 formed in the direct emission area 7 and the air. The second light reflecting member 4 is refracted and converted into substantially parallel light and exits directly from the exit region 7, and exits from the light emitting element 1 and is constituted by a half mirror on a path 41.
Part of the light directed to 4 is transmitted through the second light reflecting member 44 and proceeds to the path 42, where the light is refracted at the interface between the mold resin 9 of the lens portion 38 and the air, is converted into substantially parallel light, and is directly emitted. The light exits from the area 7, is partially reflected, is further reflected by the light reflecting member 6, and becomes almost parallel light, and directly exits through the end of the lens portion 38 configured in the emission area 7.

As a result, the portion from which light is not emitted as indicated by 12 in FIG. 11B is eliminated, and the path 4 passing through the second light reflecting member 44 constituted by this half mirror is used.
Since the boundary between the light emitted from the resin interface becomes unclear due to the light like 2, even when the light emitting device shown in FIG. 4 is viewed from the front, the light emitting state has no unevenness and looks very clear. Further, since the distance between the lens portion formed in the direct emission region 7 and the light emitting element 1 is long, the positional accuracy of the light emitting element 1 does not need to be so high, and the light distribution characteristics emitted from this lens portion can be further improved. As compared with the first embodiment shown in FIG. 1, the lens can be formed in a single time because the cutout portion 34 of the lens is eliminated.
This is the same as the effect of the second embodiment in that the production cost can be made substantially the same as compared with the conventional product shown in FIG.

FIG. 5 is a schematic sectional view of a light emitting device using an optical device for an optical element according to a fourth embodiment of the present invention. In the fourth embodiment, the outside of the second light reflecting member is shown. The angle α between the diameter portion and the optical axis of the light emitting element 1 is set near the critical angle of total reflection between the molding resin 9 and the air, and the total reflection region 8 is not affected by the critical angle determined by the molding resin 9 used. Is increased in the optical axis direction, and the intensity ratio of the light emitted from the total reflection area 8 to the light emitted from the direct emission area 7 can be increased.

In the drawing, reference numeral 1 denotes a light emitting element, 2 denotes a receiving portion on which the light emitting element 1 is mounted and die-bonded, 3 denotes a lead frame,
Is a bonding wire connecting the light emitting element 1 and the other lead frame 5, 5 is the other lead frame, 6 is a light reflecting member, 7 is a direct emission area, 8 is a total reflection area, and 9 is a light emitting element 1 or the lead frame 3 5, a first mold resin covering the light reflecting member 6, etc., 35, 36, 45, and 46 are light paths, and 38 is a lens portion formed in the direct emission area 7, and the lens portion 38 is formed as described above. It is formed in a convex lens shape such as a spherical lens shape, an aspherical lens shape, and a parabolic surface shape. Reference numeral 47 denotes a second light reflecting member formed between the lens portion 38 and the total reflection area 8. In the fourth embodiment, the second light reflecting member 47 is formed by the first light reflecting member 47 described above. Unlike the case of the third embodiment, the lens portion 38 formed in the direct emission region 7 and the optical axis side of the angle α between the boundary direction of the total reflection region 8 and the optical axis of the light emitting element 1, that is, the mold It is provided at a portion smaller than the critical angle of total reflection between the resin 9 and the air.

By configuring the optical device for an optical element in this manner, the light exiting from the light emitting element 1 and traveling toward the path 36 is transmitted directly to the interface between the mold resin 9 of the lens portion 38 formed in the direct emission area 7 and the air. The light is refracted and converted into a substantially parallel light, and is emitted directly from the emission region 7. On the other hand, the first
In the third embodiment, light traveling toward the path 45 in the interface direction of the mold resin 9 at an angle smaller than the critical angle directly toward the emission region 7 without total reflection is reflected by the second light reflection member 47. Then, the light is reflected by the light reflecting member 6 and exits from the total reflection area 8. In addition, the path 4
The light traveling toward 6 is reflected by the total reflection area 8 as described above, is reflected by the light reflecting member 6, and is emitted forward from the total reflection area 8.

Therefore, the portion where light is not emitted as indicated by 12 in FIG. 11B is eliminated, and light traveling to the total reflection area 8 at an angle smaller than the critical angle of the interface between the mold resin 9 and air is also a light reflecting member. 6, and when it is desired to emit collimated light, it is more effective to control the light with the light reflecting member 6. Therefore, even when the light emitting device shown in FIG. 5 is viewed from the front, there is no unevenness in the light emitting state, and the light emitting device looks very beautiful. Further, since the distance between the light emitting element 1 and the lens portion formed in the direct light emitting area 7 is long, the positional accuracy of the light emitting element 1 does not need to be so high, and the light distribution characteristic emitted from this lens part is narrower. In comparison with the first embodiment shown in FIG. 1, the lens can be formed at a single angle because the cutout portion 34 of the lens is eliminated, and the production cost is substantially the same as that of the conventional product shown in FIG. This is the same as the effects of the second and third embodiments.

In the embodiment described above, the case where the light emitting element 1 is sealed with the molding resin 9 has been described. However, the present invention is not limited to such an integral molding, but also includes a light reflecting member and a lens. It is also possible to use the unit in combination with an independent light emitting element or light receiving element as an optical device. FIGS. 6 to 10 show an embodiment in this case.
In the embodiment shown in FIG. 6, FIG. 6 shows a combination of the optical device for an optical device shown in the second embodiment and a surface mount type light emitting device, and FIG. 7 shows the optical device for an optical device used in FIG. FIG. 8 shows an example in combination with a shell type light emitting device, FIG. 9 shows a combination of the optical device for an optical element shown in the first embodiment and a light receiving element, and FIG. This is a combination of the optical device for an optical element shown in the second embodiment and a light receiving element.
In FIGS. 6 to 10, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals.

In the figure, 6 is a light reflecting member, 7 is a direct emission area,
8 is a total reflection area, 9 is a mold resin, 35, 36, 37
Is a light path, 38 is a lens portion, 39 is a second light reflecting member, 50 is a surface mount type light emitting element, 51 is a shell type light emitting element, 52 is a light emitting element, 53 is a direct incident area, and 54 is a total reflection area. , 55 and 56 are light receiving elements.

First, FIG. 6 shows a combination of the optical device for an optical element shown in the second embodiment and a surface mount type light emitting element 50, and FIG. 7 shows the optical device for an optical element used in FIG. It is shown. Thus, by combining the light emitting element 50 with the optical device for an optical element shown in the second embodiment of the present invention shown in FIG. 7, the light of the path 36 toward the direct emission area 7 is The light that is refracted at the interface between the mold resin 9 and the air of the lens portion 38 formed at 7 and is converted into substantially parallel light and exits, and the light traveling toward the total reflection area 8 of the path 37 is reflected by the second light reflection member 39. Then, the light is reflected by the light reflecting member 6 to become substantially parallel light, passes through the end of the lens portion 38, and the portion where light is not emitted as indicated by 12 in FIG. Therefore, even when viewed from the front side of the optical device for an optical element in FIG. 6, the light emitting state has no unevenness and looks very beautiful.

In addition, the light which has conventionally been directed substantially in each of the emission directions as a point light source is emitted from the entire area on the front surface of the optical device for an optical element, and can be used as a large-area light emitting element. Further, if the portion for mounting the light emitting element 50 of the optical device for an optical element of the present invention is made hemispherical, the light loss caused by covering the optical device for the optical element will be reduced. With only Fresnel loss when entering and exiting the device and slight reflection loss of the light reflecting member 6, 90% of the light exiting the light emitting element 50 can be emitted to the outside of the optical element optical device.

FIG. 8 shows an example in which the optical device for an optical element shown in the second embodiment is combined with a shell type light emitting device 51. The light that has been distributed to the optical device of the present invention can be re-introduced to the optical device for an optical element of the present invention, and the light utilization rate is improved to enable bright light distribution, and the light emission direction can be freely designed. It becomes possible.

Further, since the optical device for an optical element of the present invention can be mounted close to the cannonball type light emitting device 51, it is more spatially available than when the same effect is obtained by using a lens. It is possible to reduce the size and also to suppress the loss of light incident on the optical device for an optical element. In addition, by making the optical device for an optical element as shown in FIG. 8, the positioning at the time of mounting the cannonball type light emitting device 51 can be easily performed, and the removal can be easily performed. Two kinds of light distribution characteristics when combined with an optical device for an optical element can be used. In addition, if the air layer formed when the light emitting device 51 of the cannonball type is mounted on the optical device for an optical element of the present invention is sealed with a resin or the like, light loss due to Fresnel loss or the like can be reduced.

In the above description, the case of combining the optical device for the optical element according to the second embodiment shown in FIG. 2 has been described. However, the optical device for the optical device according to the first embodiment shown in FIG. It is obvious that the effects described in the description of the respective embodiments can be obtained by combining with the third and fourth embodiments shown in FIG. Also, the light emitting elements to be combined are bare chip type light emitting devices,
It can be combined with various devices such as a heat radiation type light emitting device and a flat package type light emitting device.

FIG. 9 shows an example in which the optical device for an optical element shown in the first embodiment is sealed with a light receiving element 56 such as a photodiode or a photoelectric conversion element. That is, the lens unit 30
Incident on the light receiving element 5
6, the light incident on the total reflection area 54 is reflected by the light reflection member 6, further reflected by the total reflection area 54, and
6, light from a very wide range is received by the light receiving element 5
6 and light can be received without waste. Further, since the distance between the lens unit 30 and the light receiving element 56 is long, the installation accuracy of the light receiving element 56 does not need to be so high.

FIG. 10 shows a combination of the optical device for an optical element shown in the second embodiment and a light receiving element 55 such as a photodiode or a photoelectric conversion element. With this configuration, light incident on the lens unit 38 from the front is refracted by the lens unit 38 and is incident on the light receiving element 55. Light incident on the total reflection area 54 is reflected on the light reflecting member 6, and Since the light is reflected by the reflection area 54 or the second light reflecting member 39 and reaches the light receiving element 56, light from a very wide range can reach the light receiving element 56, and the light can be received without waste. . Further, since the distance between the lens unit 30 and the light receiving element 56 is long, the installation accuracy of the light receiving element 56 does not need to be so high. Also, the lens unit 3
The intensity ratio between the light incident from the light reflecting member 8 and the light reaching the light receiving element 55 after being reflected by the light reflecting member 6 can be changed freely. Also, as compared with the embodiment shown in FIG. Is eliminated, so that the integral molding can be performed at one time, and the production cost can be kept low.

In the above description, the case where the first and second embodiments shown in FIGS. 1 and 2 are combined as an optical device for an optical element has been described. It is self-evident that the effects described in the description of each of the above embodiments can be obtained when combined with those of the third and fourth embodiments.

The applicant of the present invention has disclosed, in addition to Japanese Patent Application No. 11-341344 shown as a conventional example, Japanese Patent Application No. 2000-28
No. 330, Japanese Patent Application No. 2000-73058, Japanese Patent Application No. 2000
No. 7,497,763, Japanese Patent Application No. 2000-89859, etc., examples of optical devices using the optical device for an optical element according to the present invention are shown. Obviously, it can be used in place of the optical device for use.

[0054]

As described above, according to the first aspect of the present invention, the second light reflecting member is provided at the resin interface so that the light passing through the vicinity of the outer shape of the lens portion is reflected by the second light reflecting member. And each of the light reflecting members passes through a path that reflects at least once, so that a donut-shaped light is not emitted or a part where the incident light is lost is eliminated. There is no unevenness in the light emission state,
It is possible to provide an optical device for an optical element, which looks very clear and can efficiently emit or receive light.

According to the second aspect of the present invention,
By forming the second light reflecting member on the optical axis side from the total reflection area, light directed toward the resin interface can be reflected at an angle smaller than the critical angle of the resin interface, and the area reflected by the light reflecting member can be increased. it can. Therefore, the collimation range can be increased, the light emission characteristics can be controlled by the shape of the reflector, and the intensity ratio of light emitted from the total reflection area or light incident on the total reflection area can be increased. Therefore, when it is desired to emit collimated light, it is more effective to control the light with a light reflecting member, so that the effect is large.

According to the third aspect of the present invention,
By making the second light reflecting member a half mirror surface, there is no portion where the donut-shaped light is not emitted, and the light is transmitted from the resin interface by the light transmitted through the second light reflecting surface formed by the half mirror. Since the boundaries of the light to be emitted are not clear, even when the light emitting device is viewed from the front, there is no unevenness in the light emitting state and the light emitting device looks very beautiful.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a configuration of a main part according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a configuration of a main part according to a second embodiment of the present invention.

FIG. 3 is a view for explaining a method for forming a light emitting device using the optical device for an optical element according to the second embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a configuration of a main part according to a third embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a configuration of a main part according to a fourth embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a case where the optical device for an optical element according to the second embodiment of the present invention is combined with a surface-mount type light emitting element.

FIG. 7 is a schematic sectional view showing the optical device for an optical element shown in the second embodiment of the present invention alone.

FIG. 8 is a schematic cross-sectional view of a case where the optical device for an optical element shown in the second embodiment of the present invention and a shell type light emitting element are combined.

FIG. 9 is a schematic sectional view when the optical device for an optical element and the light receiving element shown in the first embodiment of the present invention are combined.

FIG. 10 is a schematic cross-sectional view when the optical device for an optical element and the light receiving element shown in the second embodiment of the present invention are combined.

FIG. 11 is a diagram for explaining a light emitting device using a conventional optical device for an optical element.

FIG. 12 is a view for explaining a light receiving device using a conventional optical device for an optical element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light emitting element 2 Receiving part 3 Lead frame 4 Bonding wire 5 The other lead frame 6 Light reflection member 7 Direct emission area 8 Total reflection area 9 Mold resin 35, 36, 37 Light path 38 Lens part 39 Second light reflection member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5F041 AA06 DA16 DA26 DA43 DA57 EE17 EE23 5F073 AB26 AB29 FA28 FA29 FA30 5F088 AA01 BA16 JA02 JA06 JA12 JA18 JA20

Claims (4)

[Claims] An optical device for an optical element for controlling an optical path of outgoing light from an optical element to the outside or incident light from the outside to the optical element, comprising: a light reflecting member; A surface that covers the surface, a total reflection area that almost completely reflects light outside the predetermined area in front of the optical element at the resin interface, and a lens unit that emits or condenses light that reaches the predetermined area in front of the optical element,
A light path connecting the optical element and the outside of the optical element for an optical element is provided near the resin interface or the resin interface. The resin interface, the second light-reflecting member, or the light so as to pass through at least one of the second light-reflecting members and a path that reflects at least once at each of the light-reflecting members. The arrangement or position of the reflection member is determined, and the shape or arrangement of the lens portion or the second light reflection member is determined so that light that has passed near the outer shape of the lens portion passes through the optical path. , Optical devices for optical elements. 2. The method according to claim 1, wherein the second light reflecting member is formed on the predetermined area side of the total reflection area so that light directed to the resin interface can be reflected at an angle smaller than a critical angle of the resin interface. The optical device for an optical element according to claim 1. 3. The reflection surface of the second light reflection member is a half mirror surface.
Or the optical device for optical elements as described in 2. 4. The optical device for an optical element according to claim 1, wherein the light emitting element is sealed or arranged near the center of the light reflecting member. .