TW202042406A - Stacked optical coupler formed with twice encapsulation and packaging method thereof capable of simplifying the manufacturing process and maintaining the integrity of the required elements - Google Patents

Abstract

The present invention relates to a stacked optical coupler formed with twice encapsulation and a packaging method thereof. The packaging method includes first fixing a photo-receiver to a first substrate and defining a light receiving area on a top surface of the photo-receiver; then, performing a first process of encapsulation to apply a light-transmitting insulating sealant to at least cover the light receiving area of the photo-receiver and a first connection point for then being cured to form a light-transmitting insulation layer; afterwards, fixing a photo-emitter to a top surface of the light-transmitting insulation layer and electrically connecting a second connection point of the photo-emitter to a second substrate; and finally, performing a second process of encapsulation to apply a protective insulating sealant to cover the photo-emitter and the second connection point thereon, and at least a part of the insulation layer for then being cured to form a protective layer, thereby forming the stacked optical coupler.

Description

Laminated optical coupler molded by secondary sealing glue and packaging method thereof

The present invention relates to a packaging method of an optical coupler, and particularly refers to a packaging method that uses secondary encapsulation to form a laminated optical coupler.

Generally speaking, optical coupler (optical coupler, or photoelectric coupler, optical isolator and opto-isolator) is a photoelectric conversion element that transmits electrical signals as a medium of light (such as visible light, infrared), which is roughly received by light The light emitter and the light emitter are packaged together, and there is no electrical or physical connection between the light receiver and the light emitter except light.

In conclusion, at present, optical couplers are generally divided into "left and right structure" and "up and down structure". I will briefly explain as follows. The so-called "left and right structure" refers to both the light emitter and the light receiver, which are in optical coupling. The left and right relative positions in the light-emitting device, where the light-emitting device and the light receiver are respectively arranged on different supports, and the two supports are separated from each other by a distance without touching each other, so that the light-emitting device can face the light receiver The direction casts light. In addition, the so-called "up and down structure" means that both the light emitter and the light receiver are located in the upper and lower relative positions of the optical coupler. The light emitter and the light receiver are also respectively arranged on different supports, and the The two supports are separated by a distance from each other without touching each other, so that the light emitter can project light toward the light receiver. However, whether it is a "left-right structure" or "up-and-down structure" optocouplers, they generally face problems such as too long distance between the emitter and the optical receiver, difficult alignment, and package alignment affecting the yield... .

In view of this, the inventor has designed a laminated optical coupler. Please refer to Figure 1. The laminated optical coupler A1 is composed of a light emitter A11, an insulating layer A12 and a light receiver A13. , The insulating layer A12 will be located between the light emitter A11 and the light receiver A13. The insulating layer A12 can allow the light from the light emitter A11 to pass through and project onto the light receiver A13. The A11, the insulating layer A12, and the light receiver A13 are all separate components, and the light receiver A13 and the light emitter A11 are separated by the insulating layer A12. Therefore, as long as the thickness of the insulating layer A12 is controlled, the reduction can be effectively reduced. The overall volume of the optical coupler, and the alignment of the optical receiver A13 and the light emitter A11, is easier and more precise than the floating alignment of the optical coupler of the "up and down structure".

However, the inventor found that in the actual production process, since the light emitter A11, the insulating layer A12, and the light receiver A13 are all separate components, there are still certain difficulties in the process of assembling and fixing. Making improvements to provide a more convenient manufacturing process has become an important issue to be solved by the present invention.

In view of the improvement in the foregoing laminated optical coupler and its production, the inventor has developed and designed a laminated optical coupler formed by a secondary encapsulation and its packaging method of the present invention, in order to provide The industry has simplified the manufacturing process to effectively solve the aforementioned problems.

One of the objects of the present invention is to provide a method for packaging a laminated optical coupler formed by a secondary molding. First, a light receiver is fixed to a first substrate, and a first joint of the light receiver can be It is electrically connected to a first contact of the first substrate, and a light receiving area is provided on the top surface of the light receiver. Furthermore, the first sealing procedure is performed, and a transparent insulating glue at least covers the The partial area of the light receiver is cured and used as a light-transmitting insulating layer, wherein the aforementioned The local area includes the light-receiving area and the position of the first joint. After that, a light emitter is fixed to the top surface of the light-transmitting insulating layer, and it can penetrate the light-transmitting insulating layer and face the corresponding light-receiving area Project light in the direction, a second joint of the light emitter can be electrically connected to a second contact of a second substrate, and finally, a second sealing process is performed, and a protective insulating glue covers the light emitter And the second junction and at least part of the light-transmitting insulating layer are cured and used as a protective layer to form the laminated optical coupler. In this way, the industry can quickly and simply connect the light receiver and the light-emitting Between the two devices, the transparent insulating layer is made.

Another object of the present invention is to provide a laminated optical coupler molded by a secondary encapsulant, which includes a light receiver, a light-transmitting insulating layer, a light emitter, and a protective layer, wherein the light receiver is It is fixed to a first substrate and has a light receiving area on its top surface. A first joint of the light receiver can be electrically connected to a first contact of the first substrate. The light-transmitting insulating layer is formed by A light-transmitting insulating glue is cured. The light-transmitting insulating layer covers at least a partial area of the light receiver, and the aforementioned partial area includes the light receiving area and the position of the first junction, the light emitting device can be Fixed to the top surface of the light-transmitting insulating layer, which can pass through the light-transmitting insulating layer and project light toward the corresponding light-receiving area, and a second junction of the light emitter can be electrically connected to a second substrate A second joint, the protective layer is formed by curing a protective insulating glue, and the protective layer covers the light emitter, the second joint thereon, and at least part of the transparent insulating layer, In this way, the industry only needs to go through the sealing process twice to sequentially form the light-transmitting insulating layer and the protective layer.

Another object of the present invention is that the light-transmitting insulating glue can completely cover the light receiver, so that the light receiver can be more stably positioned on the first substrate.

Another object of the present invention is that the protective insulating glue can completely cover the transparent insulating glue. The edge layer effectively protects the integrity of the necessary components (such as the light receiver, the transparent insulating layer and the light emitter) when the laminated optical coupler is in operation.

In order to facilitate your reviewers to have a further understanding and understanding of the purpose, technical features and effects of the present invention, the examples and diagrams are described in detail as follows:

[Learning]

A1‧‧‧Laminated Optocoupler

A11‧‧‧Light emitter

A12‧‧‧Insulation layer

A13‧‧‧Optical Receiver

〔this invention〕

1‧‧‧Laminated Optocoupler

11‧‧‧Optical receiver

111‧‧‧First junction

113‧‧‧Light receiving area

13‧‧‧Transparent insulating layer

15‧‧‧Light

151‧‧‧Second junction

17‧‧‧Protection layer

19‧‧‧Translucent adhesive

21‧‧‧First substrate

211‧‧‧First contact

22‧‧‧Second substrate

221‧‧‧second contact

B1‧‧‧The first transmission line

B2‧‧‧Second transmission line

301~304‧‧‧Step

Figure 1 is a schematic diagram of a conventional laminated optical coupler; Figure 2 is a schematic diagram of the structure after the first sealing process of the present invention; Figure 3 is a schematic view of the structure after the second sealing process of the present invention; and Figure 4 is a flowchart of the present invention.

The present invention is a laminated optical coupler formed by secondary molding and its packaging method. Please refer to Figures 2 and 3. In one embodiment, the laminated optical coupler 1 is composed of at least one optical receiver 11, A transparent insulating layer 13, a light emitter 15 (such as: LED), a protective layer 17, a first substrate 21 and a second substrate 22, wherein the transparent insulating layer 13 will be located on the light receiver 11 and the light emitter 15 and at least cover a partial area of the light receiver 11, and the light receiver 11 can be electrically connected to the first substrate 21, and the light emitter 15 can be electrically connected To the second substrate 22, the protective layer 17 can at least cover the light-emitting device 15 and a part of the transparent insulating layer 13, so that the light emitted by the light-emitting device 15 can pass through the transparent insulating layer 13. It is received by the optical receiver 11 so that the laminated optical coupler 1 can function.

With regard to the packaging method of the laminated optical coupler 1 of the present invention, the description will be given later. Please refer to Fig. 2. First, the staff can fix an optical receiver 11 to a first substrate. 21 (such as a circuit board, a bracket, etc.), where the optical receiver 11 is fixed to the first substrate 21 by pasting, welding, inserting, etc., as long as it can be positioned on the One substrate 21 is sufficient. Furthermore, a first joint 111 of the optical receiver 11 can be electrically connected (such as wire bonding) to a first joint 211 (such as the first substrate 21) through a first transmission line B1 Step (301) in FIG. 4), and a light receiving area 113 is provided on the top surface of the light receiver 11 to receive the light emitted by the light emitter 15.

Continuing, please refer to Figure 2. After the optical receiver 11 has been positioned, the first sealing procedure can be performed. In this embodiment, the staff can completely wrap a transparent insulating glue. Covering the light receiver 11, and even covering a part of the first substrate 21, after the light-transmitting insulating glue is cured, it can form a light-transmitting insulating layer 13 (as in step (302) in Figure 4), At this time, the light receiver 11 is stably positioned on the first substrate 21 and cannot be easily displaced or separated; however, in other embodiments of the present invention, the light-transmitting insulating glue can only cover The local area of the light receiver 11, but the aforementioned local area includes the position of the light receiving area 113 and the first junction 111, the main reason is that the light-transmitting insulating glue is used as the light-transmitting insulating layer 13 to be able to The isolated light receiver 11 and the light emitter 15 are directly attached to each other, and the light of the light emitter 15 needs to pass through, so that the light can be received by the light receiving area 113.

Please refer to Figure 3 again. After the transparent insulating glue has been cured to form the transparent insulating layer 13, the staff can fix a light emitter 15 to the top surface of the transparent insulating layer 13. In this embodiment, The light emitter 15 is fixed to the light-transmitting insulating layer 13 through a light-transmitting adhesive 19, but in other embodiments of the present invention, it is not limited to this, and the industry can adopt other fixing methods according to product requirements. In addition, the light emitter 15 can project light toward the corresponding light receiving area 113, and the light projected by it will penetrate the transparent insulating layer 13 and be blocked by the light receiving area 113 of the light receiver 11. Receive; When the light-emitting device 15 is fixed to the light-transmitting insulating layer 13 with a light-transmitting adhesive 19, the refractive index of the light-transmitting adhesive 19 will be between the refractive index of the substrate (such as: LED substrate) of the light-emitting device 15 and The transparent insulating layer 13 has a refractive index between the two. A second joint 151 of the light emitter 15 can be electrically connected (such as wire bonding) to a second joint 221 of the second substrate 22 (as shown in Figure 4) through a second transmission line B2 Step (303)) to receive external power, and then be driven to emit light.

Please refer to Figure 3 again. After the light-emitting device 15 has been positioned, the second sealing procedure can be performed. In this embodiment, the worker can completely cover the light-emitting device with a protective insulating glue. 15 and the second junction 151 and the light-transmitting insulating layer 13 thereon can even cover a part of the first substrate 21 and the second substrate 22. After the protective insulating glue is cured, it can form a protective layer 17 ( As shown in step (304) in Fig. 4, the light emitter 15 can be stably positioned on the light-transmitting insulating layer 13, and is not easily damaged by external force or collision with foreign objects to form the laminated optical coupler 1, However, in other embodiments of the present invention, the protective insulating glue can not only cover the light emitting device 15 and the second junction 151 completely, but also cover only a part of the transparent insulating layer 13. Chen Ming.

In summary, it can be seen that by the packaging method of the present invention, the industry can more simply produce the laminated optical coupler 1, and only need to control the alignment of the light emitter 15, so as to greatly reduce the production difficulty and improve subsequent products. Yield rate. In addition, please refer to Figure 3 again. In addition to the protective insulating glue used for protection, the industry can also use white reflective materials (such as: Polyvinyl acetate, epoxy... Etc.), after the protective insulating glue is cured into the protective layer 17, the protective layer 17 can still have light-reflecting properties, so that the light emitted by the light emitter 15 can be received by the light receiving area 113 as much as possible However, in other embodiments of the present invention, the industry can also use a protective insulating glue made of a light-transmitting material or a non-light-transmitting material as the protective layer 17 according to product requirements.

According to, the above are only the preferred embodiments of the present invention. However, the scope of rights claimed by the present invention is not limited to this. Anyone familiar with the art can use the technical content disclosed in the present invention. The equivalent changes that are easily considered should all belong to the protection scope of the present invention.

301~304‧‧‧Step

Claims (14)

A packaging method for a laminated optical coupler molded by a secondary encapsulation. The packaging method of the laminated optical coupler has the following steps: fixing a light receiver to a first substrate, and a first bonding of the light receiver The dot can be electrically connected to a first contact of the first substrate, and the top surface of the light receiver is provided with a light receiving area; the first sealing procedure is performed, and a transparent insulating glue at least covers the A local area of the light receiver is cured and used as a light-transmitting insulating layer, wherein the aforementioned local area includes the light-receiving area and the position of the first junction; fixing a light emitter to the top surface of the light-transmitting insulating layer , Which can pass through the transparent insulating layer and project light toward the corresponding light receiving area, a second junction of the light emitter can be electrically connected to a second junction of a second substrate; and a second time Sealing process, and make a protective insulating glue cover the light emitter and the second junction on it and at least part of the transparent insulating layer to cure and serve as a protective layer to form the laminated optical coupler . The packaging method of the laminated optical coupler according to claim 1, wherein the protective insulating glue is made of white reflective material. The packaging method of the laminated optical coupler according to claim 1, wherein the protective insulating glue is made of light-transmitting material. The packaging method of the laminated optical coupler according to claim 1, wherein the protective insulating glue is made of opaque material. The packaging method of a laminated optical coupler according to any one of claims 1 to 4, wherein the light emitter is fixed to the light-transmitting insulating layer through a light-transmitting adhesive. The packaging method of the laminated optical coupler according to claim 5, wherein the transparent insulating glue is complete The light receiver is completely covered. The packaging method of the laminated optical coupler according to claim 6, wherein the protective insulating glue completely covers the transparent insulating layer. A laminated optical coupler molded by a secondary encapsulant, comprising: a light receiver fixed to a first substrate, the top surface of the light receiver is provided with a light receiving area, and a light receiver The first joint can be electrically connected to a first contact of the first substrate; a light-transmitting insulating layer is cured by a light-transmitting insulating glue, and the light-transmitting insulating layer covers at least the light receiver And the aforementioned local area includes the light-receiving area and the position of the first junction; a light emitter is fixed to the top surface of the light-transmitting insulating layer, which can penetrate the light-transmitting insulating layer and face The light is projected in the direction of the corresponding light receiving area, and a second joint of the light emitter can be electrically connected to a second joint of a second substrate; and a protective layer is formed by curing a protective insulating glue, and The protective layer covers the light emitting device, the second junction point thereon, and at least part of the transparent insulating layer. The laminated optical coupler according to claim 8, wherein the protective layer is made of white reflective material. The laminated optical coupler according to claim 8, wherein the protective layer is made of light-transmitting material. The laminated optical coupler according to claim 8, wherein the protective layer is made of opaque material. The laminated optical coupler according to any one of claims 8 to 11, further comprising a transparent adhesive, wherein the transparent adhesive is located between the light emitter and the transparent insulating layer. The laminated optical coupler according to claim 12, wherein the light-transmitting insulating layer completely covers the light receiver. The laminated optical coupler according to claim 13, wherein the protective layer completely covers the transparent insulating layer.

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