Diagonal optocoupler lead frame

Abstract

The utility model relates to the technical field of optocoupler lead frames, in particular to a diagonal optocoupler lead frame. The two base island assemblies are located on different space planes, the projections of the two base island assemblies on the plane where the lead support is located are distributed in a staggered mode, more light rays emitted by a light emitting diode can be received by a phototriode, the CTR of the single-chip support optocoupler is improved, the two base island assemblies are both arranged on the same lead support, and therefore the light emitting efficiency of the single-chip support optocoupler is improved. The production cost of the optocoupler is further saved, the CTR of the planar optocoupler is improved, the switching time of the optocoupler is long, the projections of the two base island assemblies on the plane where the lead support is located are separated by arranging the parting line, and therefore the two base island assemblies can be formed on the lead support at the same time, and more cost is saved; the problems that the CTR is relatively low and the switching time of the optocoupler is relatively long when the optocoupler is produced by using the raw material and the approximate cost of the currently adopted planar optocoupler at present are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optocoupler lead frames, in particular to a diagonal optocoupler lead frame. Background Art

[0002] At present, the optocoupler lead frames are mainly divided into two types: vertical type and planar type. For the vertical optocoupler, since the photosensitive triode and the light-emitting diode are facing each other, its light-receiving efficiency is relatively high. However, the vertical optocoupler requires two lead frames for assembly to achieve the facing effect, and the bracket cost is twice that of the planar type. The planar optocoupler only requires one optocoupler lead frame, and its production process is relatively simple. However, its light-receiving efficiency is poor, and the switching time (optocoupler switching time) is relatively long, which limits its application. A corresponding reflective structure needs to be specially designed to improve its light-receiving efficiency. However, since there is still a lot of light that is not reflected onto the photosensitive triode during reflection, taking the PC817 black package as an example, the CTR (photoelectric transmission ratio) is generally below 450, and the yield is about 70%, resulting in a large waste of raw materials. At the same time, the switching time (optocoupler switching time) is relatively long. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a diagonal optocoupler lead frame, which solves the problems of relatively low CTR and relatively long optocoupler switching time when producing optocouplers with the raw materials and approximate costs of the currently used planar optocouplers.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A diagonal optocoupler lead frame includes at least one lead bracket as an installation carrier. A plurality of groups of base island assemblies for installing optocoupler devices are provided on the lead bracket. Two corresponding base island assemblies are located on different spatial planes, and the projections of the two corresponding base island assemblies on the plane where the lead bracket is located are staggeredly distributed.

[0006] Preferably, the base island assembly includes a base island body for installing an optocoupler device and a leg connected to the optocoupler device through a wire.

[0007] Preferably, a dividing line is provided between the projections of the two corresponding base island assemblies on the plane where the lead bracket is located.

[0008] Preferably, the dividing line is parallel to the extending direction of the leg.

[0009] Preferably, the two corresponding base island bodies are symmetrically distributed with respect to the dividing line.

[0010] Preferably, an avoidance groove for avoiding the supporting feet is provided on one side of the base island body facing the dividing line.

[0011] Preferably, there is one lead frame, and the two corresponding base island components are both arranged on the same lead frame.

[0012] Compared with the prior art, the utility model provides a diagonal optocoupler lead frame, which has the following beneficial effects:

[0013] 1. By making the two base island components located on different spatial planes so that their projections on the plane where the lead frame is located are staggeredly distributed, more light emitted from the light-emitting diode can be received by the photosensitive triode, improving the CTR of the optocoupler, and at the same time, the production cost can be ensured.

[0014] 2. By arranging the two base island components on the same lead frame, the number of lead frames can be further saved, and at the same time, various positional relationships between the base island components can be well compatible, further saving the production cost of the optocoupler and improving the CTR of the optocoupler.

[0015] 3. By setting the dividing line, the projections of the two base island components on the plane where the lead frame is located are separated, so that two base island components can be formed on one lead frame at the same time, and the subsequent process of stacking two lead frames is also saved, saving more cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:

[0017] Figure 1 is a schematic diagram of the lead frame of the present utility model;

[0018] Figure 2 is a side view of the lead frame of the present utility model;

[0019] Figure 3 is Figure 1 the enlarged view of part A in

[0020] In the figure: 1. Lead frame; 2. Base island component; 21. Base island body; 22. Supporting feet; 3. Dividing line; 4. Avoidance groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will cooperate with the drawings and embodiments to detail the implementation manners of the present application, so as to fully understand the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects and implement accordingly.

[0022] In order to improve the CTR of the optocoupler on the basis of using planar optocoupler raw materials and approximately the same cost, the present utility model provides a diagonal optocoupler lead frame. By combining the characteristics of vertical optocouplers and planar optocouplers, the layout form of the planar optocoupler is changed to improve the light receiving efficiency and CTR of the optocoupler. Please refer to Figures 1 - 3 , on at least one lead support 1, there are provided several groups of base island assemblies 2 for mounting optocoupler devices. The optocoupler devices on every two groups of base island assemblies 2 can cooperate with each other to conduct optical signals. The main body of the optocoupler device is components such as a photosensitive triode and a light emitting diode for emitting and receiving optical signals. The two corresponding base island assemblies 2 are located on different spatial planes, and the projections of the two corresponding base island assemblies 2 on the plane where the lead support 1 is located are staggeredly distributed. In this way, the light emitted by the light emitting diode can be better emitted to the photosensitive triode that is nearly directly opposite, improving the light receiving efficiency of the optocoupler. At the same time, because the projections of the two corresponding base island assemblies 2 on the plane where the lead support 1 is located are staggeredly distributed, it can also reduce the mutual interference during the wire bonding process and improve the yield of wire bonding. Its cost increases at most the cost of an optocoupler lead frame compared with the planar optocoupler, but it also saves the cost of the corresponding reflective structure. Therefore, compared with the cost of the existing planar optocoupler, it is slightly higher, but lower than the cost of the vertical optocoupler, and reduces the switching time of the optocoupler.

[0023] The structure of the base island assembly 2 is similar to that of the planar optocoupler, and it is hereby clarified. The base island assembly 2 includes a base island body 21 for mounting the optocoupler device, and a leg 22 connected to the optocoupler device through a wire, that is, one electrode of a light receiving and emitting element such as a photosensitive triode or a photosensitive diode is mounted on the base island body 21, and the other electrode is connected to the leg 22.

[0024] When the staggered range of the projections of the two base island assemblies 2 on the plane where the lead support 1 is located is larger, the wires of the two optocoupler devices are more likely to interfere during wire bonding, thus causing poor wire bonding. Therefore, a dividing line 3 is provided between the projections of the two corresponding base island assemblies 2 on the plane where the lead support 1 is located to ensure that the wires of the optocoupler devices on the two base island assemblies 2 are fully separated as a related process, improving the welding yield.

[0025] The dividing line 3 can be set at any position on the plane where the lead support 1 is located, but it may increase the overall volume of the subsequent product, resulting in a larger overall lead frame and more glue consumption during packaging. Therefore, the dividing line 3 is parallel to the extending direction of the leg 22, which can save the material cost to the greatest extent.

[0026] When the relative positions of the two base island bodies 21 are far apart, it will reduce the light-receiving efficiency, CTR of the formed optocoupler and increase the Switching time. In order to further improve the CTR of the optocoupler and shorten the Switching time, the corresponding two base island bodies 21 are symmetrically distributed with respect to the dividing line 3. In this way, the photosensitive triode and the light-emitting diode on the base island body 21 can be as close as possible, so that the light emitted by the light-emitting diode can be received by the photosensitive triode to the greatest extent, thereby improving the subsequent CTR of the optocoupler and shortening the Switching time.

[0027] The support leg 22 can be arranged at any position relative to the base island body 21, but it may cause a relatively large overall occupied space. In order to save costs, an avoidance groove 4 for avoiding the support leg 22 is provided on one side of the base island body 21 facing the dividing line 3, which can further reduce its cost on the basis of ensuring the maximum operation of the finished optocoupler.

[0028] When there are two lead frames 1, the effect of improving the CTR can be achieved, but its cost is relatively high. In order to further save costs, the lead frame 1 is made to be one, and the corresponding two base island assemblies 2 are both arranged on the same lead frame 1. At the same time, it can also meet the positional relationship of the above-mentioned support leg 22 relative to the base island body 21, and there is a dividing line 3 between the projections of the corresponding two base island assemblies 2 on the plane where the lead frame 1 is located, and the two base island bodies 21 are symmetrically distributed with respect to the dividing line 3 and other positional relationships, which can further save the required cost under the condition of compatibility.

[0029] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A diagonal optical coupler lead frame, comprising at least one lead support (1) as a mounting carrier, characterized in that: The lead support (1) is provided with a plurality of base island components (2) for mounting optical coupling devices, two corresponding base island components (2) are located on different spatial planes, and the projections of the two corresponding base island components (2) on the plane where the lead support (1) is located are staggered.

2. The lead frame according to claim 1, characterized in that: The base island component (2) comprises a base island body (21) for mounting an optical coupling device, and a support leg (22) connected to the optical coupling device via a wire.

3. The lead frame according to claim 2, wherein: A dividing line (3) is provided between the projections of the two corresponding base island components (2) on the plane where the lead support (1) is located.

4. The lead frame according to claim 3, characterized in that: The dividing line (3) is parallel to the extension direction of the supporting foot (22).

5. The lead frame according to claim 3, characterized in that: The two corresponding base island bodies (21) are symmetrically distributed about the dividing line (3).

6. The lead frame according to claim 3, characterized in that: A side of the base island body (21) facing the dividing line (3) is provided with an avoidance groove (4) for avoiding the support foot (22).

7. The lead frame according to claim 1, wherein: There is one lead support (1), and the two corresponding base island components (2) are both arranged on the same lead support (1).

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