TWI745868B - Laminated optocoupler structure capable of eliminating or reducing parasitic capacitance - Google Patents

Abstract

The present invention is a laminated optical coupler structure capable of eliminating or reducing parasitic capacitance, comprising an insulating layer, a light emitter and at least one light receiver, wherein the insulating layer is provided between the light emitter and the light receiver Layer, and the light emitted by the light emitter can be projected to the light receiver through the insulating layer. The laminated optical coupler is characterized in that the light sensitive areas of the light emitter and the light receiver are misaligned with each other, and If it is not in the corresponding position, in this way, the light emitter and the light sensitive area can be effectively isolated, thereby eliminating or reducing the parasitic capacitance between the light emitter and the light sensitive area.

Description

Laminated optocoupler structure capable of eliminating or reducing parasitic capacitance

The present invention relates to a laminated optical coupler, and particularly refers to a laminated optical coupler in which the light sensitive areas of the light emitter and the light receiver are misaligned with each other.

Generally speaking, optical coupler (optical coupler, or photoelectric coupler, optical isolator and opto-isolator) is a photoelectric conversion element that transmits electric signals as a medium of light (such as visible light, infrared), which is roughly received by light The light-emitting device and the light-emitting device are packaged together, and there is no electrical or physical connection between the light-receiving device and the light-emitting device except for 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 respectively optically coupled. The left and right relative positions in the light receiver, where the light emitter 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. In this way, the light emitter can face the light receiver. The direction casts light. In addition, the so-called "up-and-down structure" refers to that 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 installed on different supports. The two brackets are separated from each other by a distance 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" optical couplers, they generally face problems such as too long distance between the emitter and the optical receiver, difficult alignment, and package alignment affecting the yield rate.

In view of this, the inventor has designed a laminated optical coupler. Please refer to Figure 1. The laminated optical coupler 1 is composed of a light emitter 11, an insulating layer 12, and a light receiver 13. The insulating layer 12 will be located between the light emitter 11 and the light receiver 13. The insulating layer 12 can allow the light from the light emitter 11 to pass through and project onto a light sensitive area 131 of the light receiver 13 In this way, since the light emitter 11, the insulating layer 12 and the light receiver 13 are all separate components, and the light receiver 13 and the light emitter 11 are separated by the insulating layer 12, it is only necessary to control the insulating layer 12 The thickness can effectively reduce the overall volume of the optical coupler, and the alignment of the optical receiver 13 and the light emitter 11 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 order to achieve the maximum light coupling effect, the light emitter 11 directly corresponds to the light sensitive area 131. This will cause the light emitter 11 and the light receiver 13 (light sensitive area 131) to be separated from each other. The parasitic capacitance is too large. In particular, as the volume of the laminated optocoupler 1 is reduced, the light emitter 11 is closer to the light sensitive area 131, the aforementioned problem of excessive parasitic capacitance will be more serious, and the problem of excessive parasitic capacitance will be more serious. The circuit performance of the laminated optocoupler 1 has adverse effects. Therefore, how to improve the above-mentioned shortcomings so that the laminated optocoupler 1 can still operate normally and effectively eliminate or greatly reduce the parasitic capacitance problem is the present invention. The important issue to be solved.

In view of the fact that the structure of the aforementioned laminated optocoupler still has some improvements, the inventor has finally developed a research and development after long-term research and experimentation based on his rich practical experience in designing for many years and upholding the research spirit of excellence. A laminated optocoupler structure capable of eliminating or reducing parasitic capacitance of the present invention is proposed, in order to provide users with a better use experience through the present invention, so as to effectively solve the aforementioned problems.

An object of the present invention is to provide a laminated optical coupler structure with elimination or reduction of parasitic capacitance, including an insulating layer, a light emitter and a first light receiver, wherein the insulating layer is provided with a light-transmitting area, And the light-transmitting area can allow light to pass through the top surface of the insulating layer and project out from the bottom surface of the insulating layer; the light emitter is located on the top surface of the insulating layer, and the bottom surface can emit light so as to pass The light-transmitting area is projected out, the area of the light emitter will be smaller than the area of the insulating layer; the first light receiver will be located on the bottom surface of the insulating layer, and a first light sensitive area is provided on it to receive the light from the transparent Light in the light area; the laminated optical coupler is characterized in that the light emitter and the first light sensitive area are misaligned with each other, and are not in corresponding positions. In this way, the light emitter and the first light can be effectively separated Sensitive area, thereby eliminating or reducing the parasitic capacitance between the light emitter and the first light sensitive area.

In order to facilitate your reviewer 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:

The present invention is a laminated optical coupler structure with eliminating or reducing parasitic capacitance. In one embodiment, please refer to FIG. The insulating layer 23 and a first light receiver 25 are formed. For the convenience of description, the upper part of Fig. 2 is taken as the upper (top side) position of the element, and the lower part of Fig. 2 is taken as the lower (bottom side) position of the element. However, the aforementioned directions are only to facilitate the description of the arrangement relationship between the components, and do not involve the direction and position of the actual installation and use of the laminated optical coupler 2.

Please refer to Figure 2 again, the light emitter 21 will be fixed on the top surface of the insulating layer 23, the bottom surface of which can emit light, and its area will be smaller than the area of the insulating layer 23. In this embodiment, the light emitter 21 can be bonded to the top surface of the insulating layer 23 through a light-transmitting glue 27, but not limited to this, as long as the light emitter 21 is located on the top surface of the insulating layer 23 and will project light toward the insulating layer 23. Can. In addition, the insulating layer 23 is provided with a light-transmitting area, so that the light emitted by the light emitter 21 can pass through the top surface of the insulating layer 23 and be projected out from the bottom surface of the insulating layer 23. The aspect of the layer 23 and its light-transmitting area can adopt the following structure: (1) Take Figure 2 as an example. In this embodiment, the entire insulating layer 23 is made of light-transmitting material (such as glass, plastic, insulating oil, mica (MICA), silicon carbide (SiC), silicon nitride (Si3N4)). )...Etc.) is made to form a light-transmitting area naturally; (2) Taking Fig. 3 as an example, in another embodiment, the insulating layer 23' is made of a combination of an opaque material and a light-transmitting material (or openings), and a light-transmitting material (or openings) The corresponding range will form a light-transmitting area 231.

Please refer to FIG. 2 again. The first light receiver 25 is located on the bottom surface of the insulating layer 23, and a first light sensitive area 251 is provided on it to receive light. In order to solve the problem of conventional laminated light coupling The parasitic capacitance of the light-emitting device is too large. In this embodiment, the light-emitting device 21 and the first light-sensitive area 251 are misaligned with each other, and are not in corresponding positions. Furthermore, although the light-emitting device 21 and the first light-receiver 25. The two are not directly opposed. However, the light emitted by the light emitter 21 will still be projected to the first light sensitive area 251. For example, when the insulating layer 23 is entirely made of light-transmitting material (as shown in FIG. ), part of the light emitted from the bottom surface of the light emitter 21 will be transmitted to the first light sensitive area 251 due to refraction after entering the insulating layer 23, and the aforementioned light intensity is sufficient for the first light receiver 25 to perform the corresponding procedure (For example, to generate a corresponding signal). In addition, in other embodiments of the present invention, the insulating layer 23 can also be provided with particles with refraction/reflection capabilities, so that the light emitted by the light emitter 21 can be projected to the first Light sensitive area 251.

In addition, when the insulating layer 23' is made of a combination of opaque material and light-transmitting material (or opening) (as shown in Figure 3), the light emitted from the bottom surface of the light emitter 21 can pass through the insulation The reflection effect of the inner wall surface of the layer 23' (for example, a reflective layer is provided on the wall surface of the opaque material adjacent to the light-transmitting material (or opening)), or through the light-transmitting effect of the light-transmitting material itself The area 231 is projected to the first light sensitive area 251, and the intensity of the aforementioned light is sufficient to enable the first light receiver 25 to perform the corresponding procedure. /Reflective particles. In this way, although the optical coupling effect of the laminated optical coupler 2 of the present invention is slightly lower (compared to the conventional laminated optical coupler), it is still sufficient to enable the laminated optical coupler 2 to exert the effect expected by the user and can Significantly reduce parasitic effects and avoid excessive parasitic capacitance.

In addition, in order to further eliminate parasitic capacitance, please refer to Fig. 2. In this embodiment, the bottom surface of the insulating layer 23 or the top surface of the first light receiver 25 corresponds to that of the light emitter 21. Position, a conductor layer 29 can be provided, and the conductor layer 29 will be grounded. Here is a description of one of the grounding methods of the conductor layer 29. Please refer to Figure 2 again. Fixed (such as: welding, inserting or pasting... etc.) to a receiving side substrate 31 (such as: circuit board, bracket... etc.), and a first connecting pin 252 is provided on it, and the first connecting pin 252 It can be electrically connected (such as wire bonding) to a first contact 311 of the receiving side substrate 31 through a first transmission line A1; a main connection pin 211 of the light emitter 21 can be electrically connected to a A second contact 321 of the light-emitting side substrate 32; in this embodiment, a joint 291 of the conductor layer 29 can be electrically connected to the ground contact 312 of the receiving side substrate 31 through a wire A3; In other embodiments of the present invention, the industry can adjust the grounding method of the conductor layer 29 according to the product requirements, and it will be explained first.

Furthermore, in some electronic devices (such as isolation amplifiers), when the input circuit and the output circuit need to be isolated, but the signal output by the output circuit needs to be the same as the signal received by the input circuit, it can also be used Two light receivers are provided in the laminated optical coupler of the present invention. Please refer to FIG. 4. In another embodiment, the laminated optical coupler 4 includes a light emitter 41, an insulating layer 43, and a second optical receiver. A light receiver 45A and a second light receiver 45B, wherein the light emitter 41 is fixed on the top surface of the insulating layer 43, and the first light receiver 45A and the second light receiver 45B are respectively fixed on the The bottom surface of the insulating layer 43, in which the first light sensitive area 451A of the first light receiver 45A and the second light sensitive area 451B of the second light receiver 45B, both of which will be misaligned with the light emitter 41, However, the light emitted from the bottom surface of the light emitter 41 can pass through the light-transmitting area of the insulating layer 43 and project to the first light sensitive area 451A and the second light sensitive area 451B. In addition, the insulating layer 43 corresponds to light emitting The bottom surface of the device 41 is provided with a conductive layer 49, and the conductive layer 49 is also grounded (the grounding method is omitted in FIG. 4).

Continuing, please refer to Figure 4 again. In another embodiment, the first optical receiver 45A is fixed to the receiving side substrate 51 and electrically connected to the receiving side substrate 51 through the first transmission line B1. The light emitter 41 is electrically connected to the light-emitting side substrate 52 through the second transmission line B2. In addition, the second light receiver 45B is fixed to the light-emitting side substrate 52, and a second junction 452B thereof can be electrically connected to On a third contact 522 of the light-emitting side substrate 52, since the first light receiver 45A and the second light receiver 45B are isolated from each other at a high voltage, the first light sensitive area 451A and the second light sensitive area The installation positions of the two 451Bs are approximately symmetrical with respect to the light emitter 41. The aforementioned "symmetrical configuration" generally refers to the fact that the light sensitive areas 451A and 451B receive the same light intensity at the same distance. For example, when the first light sensitive area 451A, the second light sensitive area 451B, and the light emitter 41 are arranged in a triangle (may be a triangle in the top view, or a triangle in the side view), the first light sensitive area 451A, The second light sensitive area 451B can be symmetrical points to each other, and the distance between the first light sensitive area 451A and the light emitter 41 and the distance between the second light sensitive area 451B and the light emitter 41 can be symmetrical sides of each other. Therefore, when the light emitter 41 emits light, the first light receiver 45A and the second light receiver 45B will have the same or extremely similar light receiving characteristics. The device 41 is connected to the second optical receiver 45B (not isolated), and the industry can make the illuminator 41 emit light and pass the light receiving amount of the second optical receiver 45B (that is, the signal returned by the second optical receiver 45B), To estimate the light receiving capacity of the first light receiver 45A, the light intensity, irradiation time, or irradiation frequency of the light emitter 41 can be appropriately adjusted according to the circuit 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. Easily considered equivalent changes should fall within the scope of protection of the present invention.

[Learning] 1: Laminated optical coupler 11: Illuminator 12: Insulation layer 13: Optical receiver 131: Light sensitive area [this invention] 2, 4: Laminated optical coupler 21, 41: illuminator 211: Main connection pin 23, 23’, 43: Insulation layer 231: light transmission area 25, 45A: the first optical receiver 251, 451A: the first light sensitive area 252: The first connection pin 27: Transparent glue 29, 49: Conductor layer 291: Joint 31, 51: Receiving side substrate 311: The first contact 312: Ground contact 32, 52: Light-emitting side substrate 321: second contact 45B: second optical receiver 451B: second light sensitive area 452B: second junction 522: The third contact A1, B1: the first transmission line A2, B2: the second transmission line A3: Wire

Figure 1 is a schematic diagram of a conventional laminated optical coupler; Figure 2 is a schematic diagram of a laminated optical coupler according to an embodiment of the present invention; Fig. 3 is a schematic diagram of a laminated optical coupler according to another embodiment of the present invention; and Fig. 4 is a schematic diagram of a laminated optical coupler according to another embodiment of the present invention.

2: Laminated optical coupler 21: Illuminator 211: Main connection pin 23: Insulation layer 25: The first optical receiver 251: The first light sensitive area 252: The first connection pin 27: Transparent glue 29: Conductor layer 291: Joint 31: Receiving side substrate 311: The first contact 312: Ground contact 32: Light-emitting side substrate 321: second contact A1: The first transmission line A2: The second transmission line A3: Wire

Claims (4)

A laminated optical coupler structure capable of eliminating or reducing parasitic capacitance includes: an insulating layer provided with a light-transmitting area, the light-transmitting area can allow light to pass through the top surface of the insulating layer and pass through the bottom surface of the insulating layer Projected out; a single light emitting device is located on the top surface of the insulating layer, the bottom surface of the light emitting device can emit light, and can be projected out through the light-transmitting area, the area of the light emitting device will be smaller than the insulating layer The area; and a single first light receiver is located on the bottom surface of the insulating layer, on which a first light sensitive area is provided to receive light from the light transmitting area; characterized in that the light emitter The first light sensitive area and the first light sensitive area will be misaligned with each other, and not at the corresponding position. The laminated optical coupler structure according to claim 1, wherein the bottom surface of the insulating layer or the top surface of the first light receiver corresponds to the position of the light emitter, and a conductive layer is provided, and the conductive layer is grounded. The laminated optical coupler structure according to claim 2, wherein the first optical receiver is fixed to a receiving side substrate, and a first connection pin of the first optical receiver can be electrically connected to the receiving side A first contact of the substrate, the conductor layer is electrically connected to the ground contact of the receiving side substrate, and a main connection pin of the light emitter can be electrically connected to a second contact of a light emitting side substrate. The laminated optical coupler structure according to claim 3, wherein the light emitter is bonded to the top surface of the insulating layer through a light-transmitting glue.

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