JPH02282207A - Optical link and its manufacturing method - Google Patents

Abstract

PURPOSE:To obtain the optical link which can sufficiently maintain the strength to thermal stresses and external forces and the process for producing the link by providing lead frames with holes and running a resin in the holes to relatively fix molding parts and the lead frames at the time of molding. CONSTITUTION:The packaging parts of electrooptical converting elements 11 or optoelectrical converting elements 12 which are formed as chips are fixed into the molding parts 2 molded of the light transmittable resin. Cable inserting parts 4 formed with the insertion holes 5 to be inserted with the ends of an optical fiber cable 6 are superposed on the outer side of the molding parts 2 and are molded by the black resin or the like having a light shielding property so as to be integrated with the molding parts 2. The lead frames 7 of the respective elements 11, 12 are provided with the holes 8 and the resin runs through the holes 8 to relatively fix the molding parts 2 and the lead frames 7 at the time of the molding of the resin in the molding parts 2 and, therefore, the strength of these parts is sufficiently maintained.

Description

[Detailed Description of the Invention] Longevity Demarcation The present invention provides an optical link that connects an electrical/optical conversion element or an optical/electrical conversion element and an end face of an optical fiber cable so that they can exchange optical signals. and its manufacturing method.

Minobe Giho Recent automobiles are increasingly becoming electronic devices, such as using microcomputers to control the engine and the vehicle's running posture. Therefore, an optical link is used to send and receive optical signals between the control device and the controlled device to prevent electrical noise from being mixed in during signal transmission. is being attempted.

However, in this case, for example, if the optical link is installed in a narrow engine room where temperature changes are significant and equipment is crowded, the optical link will be subject to frequent external forces such as thermal stress and during maintenance inspections. Therefore, an optical link with sufficient strength is particularly required.

Conventionally, in this type of optical link, an electrical/optical conversion element or an optical/electrical conversion element and the end of an optical fiber cable pull are attached to separately provided holders using adhesive, and then each holder is attached to a separately provided holder. (Refer to Japanese Utility Model Publication No. 14801.0 of 1983).

However, in this type of optical link, the optical link is large and weak in strength, making it unsuitable for use under harsh conditions such as inside an engine compartment.

I-Strawberry The present invention has been made in consideration of the following two points, and provides an optical link that is small and can maintain sufficient strength against thermal stress and external force. An object of the present invention is to provide a method for manufacturing an optical link that can optimally manufacture such an optical link.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In the optical link according to the present invention, as shown in FIG. 1 and FIG. (71, 72, 73) are provided to be integrated with the molded part 2 molded with a light-transmitting resin and the optical fiber cable 6 so that the parts (71, 72, 73) are drawn out to the outside. A cable insertion portion 4 is formed with an insertion hole 5 into which the end portion is inserted.

In addition, in FIG. 2, two sets of electrical/optical conversion elements 11 and optical/electrical conversion elements 12 are arranged side by side with bearings so that optical signals can be transmitted and received in both directions. I have to.

Here, the cable insertion part 4 is molded with a light-blocking black resin or the like to overlap the outside of each molded part 2 so as to integrate each molded part 2, and is used for electrical and electrical connections. Noise due to external light is prevented from being mixed into the optical signals exchanged between the optical conversion element 11 and the optical/electrical conversion element 12 and the end face of each optical fiber cable 6.

Optical fiber cable 6 inserted into cable insertion part 4
is fixed to the cable insertion part 4 side by means such as adhesion, for example.

Further, in order to simplify the structure by reducing the number of drawers of the lead frame 7, a lead frame 71 for applying bias to the electric/optical conversion element 11 and the optical/electrical conversion element 12 installed in parallel is provided. It is designed to have a common lead frame configuration.

Note that by making the lead frame 71 common, its area becomes larger, and the heat dissipation efficiency of the electric/optical conversion element [2] is improved.

In the figure, 72 indicates a grounding frame -1, and 73 indicates an output lead frame of the optical/electric conversion element 12.

In addition, the molding part 2 has a misalignment in the axial direction between the end face of the optical fiber cable 6 inserted into the cable insertion part 4 and the electrical/optical conversion element 11 or the optical/electrical conversion element 12 facing it.

Alternatively, the Cori-Tsu 1 to lens-shaped lens portion 3 for suppressing attenuation of the optical signal due to radial deviation are integrally molded.

Note that, for example, as the electric/optical conversion element 11, L E
D is used. Moreover, as the optical/electric conversion element 12,
A one-chip IC that integrates a diode, a light-receiving amplifier, and a waveform shaping circuit, or an IC chip that consists of a transistor and an IC chip that has a Darlington connection between a transistor and a normal transistor. used.

In the optical link configured as described above, in particular, in the present invention, when the resin is molded in the molding part 2 through the lead frame 7 (71, 72, 73), the resin penetrates the lead frame 7 (71, 72, 73) and forms the mold. Molded part 2 and lead flare As 7
A 68 is provided to relatively fix the two.

Therefore, since the resin in the molded part 2 penetrates through the hole 8 of the lead frame 7 and the two are fixed relative to each other, the structure is effectively strengthened, and thermal stress and external force are not applied to that part. Even if the molded part 2 and the lead frame 7 are relatively misaligned, it is certain that the wire 9 for electrically connecting the electric/optical conversion element 11 or the optical/electrical conversion element 12 will be disconnected. Further, in the present invention, the optical link having the following second configuration is optimally manufactured as follows.

As for the manufacturing method of the optical link, first, as shown in FIG. 3, as shown in FIG. The shaped member 10 is punched and formed.

At that time, each lead frame 71°72.
A reinforcing portion consisting of the frame 13 and a plurality of bars 14 is left to prevent the frame 73 from coming apart.

Next, as a second step, the chip of the electrical/optical conversion element 11 is placed at a predetermined location on the lead frame 71 formed by punching, and the chip of the electrical/optical conversion element 11 is placed at a predetermined location on the frame 72. Each of the 12 chips is attached by bonding or the like. Then, the bonding ink of the wire 9 between the electrical/optical conversion element I] and the lead frame 72, and the bonding ink of the wire 9 between the electrical/optical conversion element J2 and the lead frame 71.
Bonding of the wire 9 between the wires 73 and 73 is performed respectively.

Next, as a third step, each part of the electrical/optical conversion element 11 and the optical/electrical conversion element 12 is molded with a light-transmitting resin to form a molded part 2, and then each molded part 2 is formed. The cable feeding part 4 is molded with another resin so that the molded part 2 is integrated.

Finally, as a fourth step, the remaining reinforcing portion consisting of the frame 13 and a plurality of bars 14 is cut.

In addition, when each lead frame 7], 72.73 needs to be bent as shown in Fig. 1, the bending process of each lead frame 71°, 72.73 should be done together before cutting the reinforcing part. let it happen.

As described above, according to the method for manufacturing an optical link according to the present invention,
The size, shape, thickness, adjacent spacing, etc. of the lead frames 71, 72, 73 can be set arbitrarily.

At this time, in particular, since each frame 71, 72, 73 is integrally reinforced with a reinforcing part during the manufacture of the optical link, it is possible to make the lead frame 71, 72, 73 thinner. It can contribute to reducing the weight of optical links.

Further, according to the method for manufacturing an optical link according to the present invention, since the optical link is manufactured efficiently, it is possible to improve the yield of the product when mass producing the optical link.

Effects As described above, according to the present invention, in view of the structure of the optical link, the electrical/optical conversion element, the optical/electrical conversion element, and the end of the optical fiber cable are integrally assembled, and in particular, the electrical/optical conversion element and the optical fiber cable are assembled together. Since the mounting part of the optical/electrical conversion element on the lead frame is strengthened, it can generate sufficient strength against thermal stress and external force, and its simple structure makes it possible to strengthen the optical link. It has excellent advantages such as being able to effectively reduce its size and weight.

Furthermore, the present invention has the excellent advantage that such optical links with superior structure can be efficiently and optimally manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view showing an embodiment of the optical link according to the present invention, FIG. 2 is a front sectional view of the optical link in the same embodiment, and FIG. 3 is a front sectional view of the optical link in the same embodiment. It is a front view showing a manufacturing stage.

11...Electricity/optical conversion element 12...Optical/electrical conversion element 2...Mold forming section 3...Lens section 4.Cable insertion section 6...Optical fiber cable 7 (71, 7
2,73) Lead frame 8 Hole 9 Wire 10 Plate member 13. t4 ・Reinforcement part

Claims (1)

[Claims] 1. An optical link that connects an electrical/optical conversion element or an optical/electrical conversion element and an end face of an optical fiber cable so that they can exchange optical signals, - A molded part in which the optical conversion element or the optical/electrical conversion element is molded with a light-transmitting resin while the lead frame of the element is pulled out to the outside;
It consists of a cable insertion part that is provided integrally with the molded part and has an insertion hole into which the end of the optical fiber cable is inserted. An optical link characterized in that a lead frame of an electrical conversion element is provided with a hole through which the resin passes. 2. A first step of punching and forming a plate-like member while leaving a reinforcing portion so as to form a lead frame, and inserting a chip of an electric/optical conversion element or an optical/electrical conversion element into a predetermined location of the lead frame. The second step is to perform wire bonding for mounting and electrical connection, and molding the electric/optical conversion element or a portion of the optical/electrical conversion element with a light-transmitting resin, and then A method for manufacturing an optical link, comprising: a third step of molding a cable insertion part with a resin, in which an insertion hole into which an end of an optical fiber cable is inserted is formed, and a fourth step of cutting the reinforcing part.