JP2000164898A - Optical space transmitting device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical space transmitting device, which can prevent degradation in a property and can be manufactured with ease, and a manufacturing method thereof. SOLUTION: An optical space transmitting device comprises a mold 3, which is made by molding at least a light-emitting element, a light-receiving element, and a signal processing circuit with resin; and a shielding member 5, which is mounted externally on the mold 3. The shielding member 5 comprises a projecting part 5a, which is bent from a side of the mold 3 to the front and fixed thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space optical transmission device suitable for long-distance transmission of, for example, 5 m or more, and a method of manufacturing the same.

[0002]

2. Description of the Related Art At present, in infrared data communication between personal computers and between the personal computers and peripheral devices, Ir is used.
Standardization by DA has been performed, and various devices using this have been circulating in the market. Furthermore, using data communication using a long-distance transmission method that is longer than current standards, a personal computer, a mouse, a keyboard,
Or, in transmission to and from a peripheral device such as a joystick, application development to various home appliances such as AV devices, such as cordless peripheral devices and bidirectional remote controllers, is expected to progress.

As an example of the above, “I
"rDA control" has been standardized. In this method, one-to-many half-duplex communication is performed. For example, communication between a personal computer (host side) and a plurality of peripheral devices such as a mouse, a keyboard, a joystick, or a game pad (peripheral side) is performed. Is what you do.

FIG. 10 shows a block diagram of an example of an optical space transmission device used for the device. As shown in FIG. 10, this space optical transmission device includes a light emitting element (LED) 1
1, a light receiving element 12, a driver circuit (driver IC) 13 for driving the light emitting element 11, and a light receiving element 1 comprising an amplifier, a band-pass filter, and a hysteresis comparator.
2, a signal processing circuit (signal processing IC) 14 for processing the signal received is housed in a single package. In this optical space transmission device, an external LED drive circuit is connected to the light emitting element 11 via the resistor _RL , and a capacitor for speeding up and a resistor for limiting the base current are connected in parallel. , R circuit, an external modulation circuit is connected to the driver circuit 13, and the light emitting element 11 is driven based on an electric signal from the modulation circuit to transmit an optical signal. Also, the signal processing circuit 1
4 is connected to an external demodulation circuit, and the optical signal received by the light receiving element 12 is converted into an electric signal by the light receiving element 12, further processed by the signal processing circuit 14, and output to the demodulation circuit.

[0005] In the future, such an optical space transmission system will be expanded to a two-way remote controller, and will be used for WebTV, DVD, or VT.
Applications to remote controllers such as AV equipment such as R and home electric appliances are expected. For this reason, for example, as a long-distance optical space transmission method of 5 m or longer, an ASK method in which a 1.5 MHz subcarrier is superimposed as shown in FIG. 11 is used. Then, since the optical space transmission device used therein incorporates a signal processing circuit such as the signal processing circuit 14 described with reference to FIG. 10, for example, adverse effects such as electromagnetic noise occur. Therefore,
In order to reduce such adverse effects, some optical space transmission devices are equipped with a shield member made of a conductive material such as a metal plate.

Here, such a conventional optical space transmission device will be described with reference to FIG. In the conventional device, as shown in FIG. 12 (a), a shield member 22 is placed in the direction of the arrow in the figure from above an optical space transmission device 21 having a light emitting element, a light receiving element, and a signal processing circuit. The optical space transmission device 21 was mounted so as to be sandwiched between the members 22. Then, the shield member 2
FIG. 12 shows the state of the optical space transmission device 21 after mounting.
FIG. 12B shows a side view and FIG. 12C shows a front view. With respect to the fixation of the optical space transmission device 21 and the shield member 22, the shield portion 22 has elasticity, and the contact portion 22 a of the shield member 22 contacts a part of the front surface of the optical space transmission device 21. Thus, the shield member 22 is fixedly held by the optical space transmission device 21.

Further, in the conventional method for manufacturing a space optical transmission device as shown in FIG. 12, as shown in FIG. 13, die bonding and wire bonding of each element such as a light emitting element, a light receiving element and an IC are performed. Thereafter, resin molding is performed using a sealing resin (S11), lead cutting, which is cutting of a lead portion, is performed (S12), and farming such as bending of the lead portion is performed (S13), and a plurality of devices are formed. A single-piece cutting is performed to cut the connected parts with a mold so as to be single (S14), and the shield member is attached as described above (S15), and the optical space transmission device is completed. It is to do. Note that S13
In the forming process, as shown in FIG. 11, the lead portion is formed into a linear lead portion 21a and two substantially bent lead portions 21b.

[0008]

However, the above-mentioned prior art has the following problems. When attaching the conventional optical space transmission device with a shield member as shown in FIG. 12 to a printed circuit board, the shield member may be inclined or detached. This will be described with reference to FIG. In order to attach the space optical transmission device 21 having the shield member 22 to the printed circuit board 23, the lead portion 21 of the space optical transmission device 21 is required.
a, 21b and the lead portion 22b of the shield member 22
It is inserted into the mounting hole of the printed circuit board 23. As described above, when the leads 21a and 21b of the optical space transmission device 21 are inserted into the mounting holes of the printed circuit board 23, the edges of the leads 22b of the shield member 22 are caught and inserted into the mounting holes of the printed circuit board 23. However, as shown in FIG. 14, the shield member 22 may be inclined.

Then, the shield member 22 did not sufficiently function as a shield, or the shield member 22 came off. As a result, in the conventional optical space transmission device, the characteristics may even be degraded.

Furthermore, in the conventional optical space transmission device,
Since the manufacturing method described with reference to FIG. 13 is used and the step of attaching the shield member (S15 in FIG. 13) is performed after the single-piece cutting step (S14 in FIG. 12), it takes time to attach the shield member. This has led to an increase in manufacturing costs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an optical space transmission device capable of preventing deterioration of characteristics and easy to manufacture, and a method of manufacturing the same. With the goal.

[0012]

According to the present invention, at least a light emitting element, a light receiving element, and a signal processing circuit are molded with a resin to form a molded part. In an optical space transmission device in which a shield member is attached to the outside of a mold section, a projection is provided on the shield member so as to be bent and fixed to the front through a side surface of the mold section.

According to the first aspect of the present invention, since the shield member is provided with the projection which is bent and fixed to the front surface via the side surface of the mold portion, it is possible to mount the optical space transmission device on a printed circuit board. Since the shield member does not tilt or come off, it is possible to prevent the characteristic deterioration of the optical space transmission device.

Further, according to the second aspect of the present invention, in the optical space transmission device according to the first aspect, an inclination is formed at the tip of the projection of the shield member so as to abut on the mold at the vertex. The contact portion is provided.

According to the second aspect of the present invention, since the abutting portion having a slope formed so as to abut on the mold portion at the apex is provided at the tip of the projection of the shield member, it is unnecessary more than necessary. It is possible to stably fix and hold the shield member to the mold portion without applying stress to the mold portion and without damaging the mold portion.

According to a third aspect of the present invention, in the optical space transmission device according to the first or second aspect, the shield member is provided with a protruding piece that comes into contact with the bottom surface of the mold portion.

According to the third aspect of the present invention, since the protruding piece contacting the bottom surface of the mold portion is provided on the mold portion,
When the shield member is mounted on the mold portion, the positioning can be easily performed, and further, the displacement between the shield member and the mold portion can be prevented.

According to the fourth aspect of the present invention, at least a light emitting element, a light receiving element, and a signal processing circuit are molded with a resin to form a molded part, and a light shielding space is mounted outside the molded part. In the method for manufacturing a transmission device, a protrusion is formed by performing molding with a resin so as to be in a state in which a plurality of optical space transmission devices are connected to a single frame to form a molded portion, and then bent and fixed. After the shield member is mounted on the mold portion of the optical space transmission device, and the protrusion is bent and fixed to the front surface via the side surface of the mold portion, a plurality of optical space transmission devices connected to a single frame are respectively formed. It is decided to cut it into a single unit.

According to the fourth aspect of the present invention, in the state where a plurality of optical space transmission devices are connected to a single frame as described above, the shield member is mounted and the front surface is inserted through the side surface of the mold portion. Since the optical space transmission devices are cut so as to be single after bending and fixing the projections, the process of mounting and fixing the shield member to the mold portion of the optical space transmission device is facilitated, and the height is increased. Since the efficiency can be improved, it is possible to significantly reduce the manufacturing cost.

According to a fifth aspect of the present invention, in the method for manufacturing a space optical transmission device according to the fourth aspect, after forming the mold portion, a frame connecting the plurality of space optical transmission devices and each of the space optical transmission devices. After cutting a part of a portion connecting to the device, the shield member is mounted on the mold portion of the optical space transmission device.

Further, according to the invention described in claim 5,
After cutting a part of a frame connecting the plurality of optical space transmission devices and a portion connecting the respective optical space transmission devices, the shield member is attached to the mold portion of the optical space transmission device. While the transmission device is maintained connected to the single frame, the shield members can be mounted on the plurality of mold portions at once, and the manufacturing process can be simplified. Furthermore, in the step of cutting a part of the portion connecting the frame and the respective optical space transmission devices, not only cutting (lead cutting) at a lead portion to be bent in a later step, but also a space for mounting a shield member. A secure cut (lead cut) can be performed, and the shield member can be easily mounted without adding a separate cutting step.

According to a sixth aspect of the present invention, in the method for manufacturing an optical transmission device according to the fourth or fifth aspect, the shield member is attached to a mold portion of the optical space transmission device, and the side surface of the mold portion is attached. After the projection is bent and fixed to the front surface, at least a part of the lead portion of the optical space transmission device is bent, and at the same time, the plurality of optical space transmission devices connected to a single frame are united. You are going to cut it.

According to the sixth aspect of the present invention, at least a part of the lead portion of the free space optical transmission device is bent, and at the same time, the plurality of free space optical transmission devices connected to a single frame become single. In this way, the manufacturing process can be simplified.

According to a seventh aspect of the present invention, in the method for manufacturing a free space optical transmission device according to the fourth aspect, the optical space transmission device is provided at a position corresponding to each of the plurality of free space transmission devices connected to a single frame. A plurality of shield members are arranged and mounted on each of the optical space transmission devices, and the projections of the shield members are bent to be fixed to each of the optical space transmission devices.

According to the seventh aspect of the present invention, a plurality of shield members are arranged at positions corresponding to each of the plurality of space optical transmission devices connected to a single frame, and each of the space optical transmission devices is provided with a shield member. Since it is mounted, and the projection of the shield member is bent and fixed to each of the optical space transmission devices, mounting and fixing of a plurality of shield members to the mold portion of the optical space transmission device can be performed simultaneously,
The manufacturing efficiency can be greatly improved, and the manufacturing cost can be significantly reduced.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, a method for manufacturing the optical space transmission device according to the present embodiment will be described. FIG.
FIG. 4 is a flowchart showing steps of a method for manufacturing an optical space transmission device according to the present embodiment. In S1 of FIG. 1, at least a light emitting element, a light receiving element, and a signal processing IC
Are formed, and a die bond or a wire bond is applied to each of them to make an electrical connection, and then molded with a molding resin to form a molded portion. Then, as shown in the main part top view of FIG. 2, the mold part 3 of the optical space transmission device 1 is formed in a state of being connected to the frame 2, and the optical space transmission device 1 and the frame 2 are connected to the connection parts 2 a, 2b,
Four directions are connected by 2c and 2d.

Next, in S2 of FIG. 1, lead cutting is performed, and cutting is performed so that a part of the connection between the optical space transmission device 1 and the frame 2 remains. Then, FIG.
As shown in the top view of the main part of (a), the optical space transmission device 1 is connected to the frame 2 only by the connection part 2'a, and a space 4 into which the insertion part of the shield member is inserted later is formed. As shown in FIG. 3B, which is an enlarged view of a part of the region A in FIG. 3A, an insertion portion of the shield member is later inserted into a portion corresponding to the upper part of the optical space transmission device 1. Lead cut part for the lead cut part 2'c
Becomes

Next, in S3 of FIG. 1, the shield member is attached. First, as shown in the side view of the main part of FIG. 4A, a plurality of shield members 4 are arranged, and the frame 2 to which the optical space transmission device 1 is connected only by the connection portion 2′a as described above is mounted. It is moved downward from above (moves in the direction of arrow B in FIG. 4A), and the insertion part of the shield member 5 is inserted into the space 4 in FIG. The member 5 is mounted.
Then, it becomes as shown in the side view of the main part of FIG. At this time, a plurality of shield members 4 are arranged at positions corresponding to each of the plurality of optical space transmission devices 1 connected to the frame 2.

Then, using a jig or the like, the protrusions 5a of the plurality of shield members 5 are simultaneously bent through both side surfaces of the mold portion 3 so that the optical space transmission device 1 can be bent.
The shield member 5 is fixed to the mold part 3 of the above, and the step of attaching the shield member 4 is completed.

Here, the shield member 4 used in this embodiment will be described with reference to FIG. 5A which is a front view thereof, and FIG. 5B which is a side view thereof. As shown in FIG. 5, the shield member 5 is provided with a protrusion 5 a for being bent and fixed to the mold portion 3. Further, the shield member 5 has a protruding piece 5b abutting on the bottom surface of the mold portion 3, a lead portion 5c to be attached to a printed circuit board later, and a side surface portion 5d formed along the side surface of the mold portion 3. . The upper surface of the shield member 5 is also formed with an upper surface along the upper surface of the mold portion 3, and the protrusion 5 a, the protrusion 5 b, and the side surface 5 are formed.
d, and the upper surface portion can prevent the displacement between the mold portion 3 and the shield member 5 in the shield member mounting step as described above, and secure a strong fixing strength even after the protrusion portion 5a is bent and fixed. Thus, displacement between the mold part 3 and the shield member 5 can be prevented.

Further, in this embodiment, as shown in FIG. 6, which is a partially enlarged view of the region C in FIG. 5B when the projection 5a of the shield member 5 is bent, At the tip of the portion 5a, there is provided a contact portion 5e having a slope formed so as to contact the mold portion 3 at the vertex. Thereby, the shield member 5 can be stably fixed and held to the mold portion 3 without applying stress to the mold portion 3 more than necessary and without damaging the mold portion 3.

FIG. 7 is a top view of a main part, showing a state where the step of attaching the shield member 5 is completed as described above.
Shown in

Next, in S4 of FIG. 1, lead forming is performed. In the present embodiment, as shown in the side view of the main part in FIG. 8, the connection part 2a between the optical space transmission device 1 and the frame 2 cut in the lead cutting step of S2 in FIG.
Is formed so as to bend at least a part of the substrate. At this time, simultaneously with this forming step, the uncut optical space transmission device 1 and the frame 2
(Lead cutting) of the connecting portion 2'a with the substrate is also performed at the same time. That is, in the present embodiment, the single-piece cutting step (S5 in FIG. 1) in which the plurality of optical space transmission devices 1 connected to the frame 2 in this manner are united in this manner is also performed.
This is performed simultaneously with the forming step (S4 in FIG. 1). Thereby, the manufacturing process can be simplified and the efficiency can be improved.

As described above, as shown in the side view of the main part of FIG.
The manufacture of the optical space transmission device 1 having a structure bent and fixed to the front through the side surface is completed. The optical space transmission device 1 of the present embodiment includes the lead portion 1a bent as described above and the linear lead portion 1b, the lead portion 5c of the shield member 5, and the attachment to the printed circuit board. Sometimes these lead portions 1a, 1
b, 5c are inserted into the mounting holes of the printed circuit board. At this time, by connecting the ground hole to the mounting hole of the printed circuit board into which the lead portion 5c of the shield member 5 is inserted, conduction between the shield member 5 and the ground is established, and external noise such as electromagnetic noise and Vcc line noise is generated. It is resistant to noise and can obtain stable characteristics.

According to the space optical transmission device of the present embodiment, the shield member does not tilt or come off when it is mounted on the printed circuit board, unlike the prior art described with reference to FIG. Therefore, a sufficient shielding effect by the shielding member can be obtained, and deterioration of the noise resistance can be prevented.

[0036]

As described above, according to the first aspect of the present invention, since the projection that is bent and fixed to the front surface via the side surface of the mold portion is provided on the shield member, the optical space transmission device is provided. When mounting on a printed circuit board, the shield member does not tilt or come off, so that it is possible to prevent the characteristic deterioration of the optical space transmission device. In other words, by holding the molded portion so as to be sandwiched by the projection provided on the shield member, even when the lead portion is caught in the mounting hole of the printed board when mounting the optical space transmission device on the printed board, Since the shield member does not come off the device body, it is possible to prevent deterioration of the noise resistance.

Further, according to the second aspect of the present invention,
Since the abutting portion formed with an inclination so as to abut on the mold portion at the apex portion is provided at the tip of the protruding portion of the shield member, the mold portion is not unnecessarily stressed and the mold portion is damaged. Without this, the shield member can be stably fixed and held on the mold portion.

According to the third aspect of the present invention, since the protruding piece abutting on the bottom surface of the mold section is provided on the mold section, positioning can be easily performed when the shield member is mounted on the mold section. Further, the displacement between the shield member and the mold portion can be prevented.

According to the fourth aspect of the present invention, in a state where a plurality of optical space transmission devices are connected to a single frame, a shield member is mounted and a projection is formed on the front surface via the side surface of the mold portion. After bending and fixing, since the optical space transmission device is cut so that each becomes a single,
Since the process of attaching and fixing the shield member to the mold portion of the optical space transmission device becomes easy and can be performed with high efficiency, it is possible to greatly reduce the manufacturing cost. That is, since a plurality of steps of attaching the shield member to the mold portion of the optical space transmission device can be performed simultaneously,
Unlike the prior art, it does not require much work, makes the manufacturing process more efficient, and makes it possible to significantly reduce the manufacturing cost.

Further, according to the invention of claim 5,
After cutting a part of a frame connecting the plurality of optical space transmission devices and a portion connecting the respective optical space transmission devices, the shield member is attached to the mold portion of the optical space transmission device. While the transmission device is maintained connected to the single frame, the shield members can be mounted on the plurality of mold portions at once, and the manufacturing process can be simplified. Furthermore, in the step of cutting a part of the portion connecting the frame and the respective optical space transmission devices, not only cutting (lead cutting) at a lead portion to be bent in a later step, but also a space for mounting a shield member. A secure cut (lead cut) can be performed, and the shield member can be easily mounted without adding a separate cutting step.

Further, according to the invention described in claim 6,
At the same time, at least a part of the lead portion of the optical space transmission device is bent and, at the same time, the plurality of optical space transmission devices connected to the single frame are cut so as to be unitary, so that the manufacturing process can be simplified. it can.

According to the seventh aspect of the present invention, a plurality of shield members are arranged at positions corresponding to the plurality of space optical transmission devices connected to a single frame, respectively. Since it is attached to each and the projection of the shield member is bent and fixed to each of the optical space transmission devices, it is possible to attach and fix a plurality of shield members to the mold portion of the optical space transmission device at the same time. Can be greatly improved, and the manufacturing cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart showing steps of a method for manufacturing an optical space transmission device according to an embodiment of the present invention.

FIG. 2 is a main part top view showing a state after forming a molded part in the method for manufacturing an optical space transmission device according to the embodiment.

3A and 3B are views showing a state after lead cutting in the method of manufacturing an optical space transmission device according to the embodiment, wherein FIG. 3A is a top view of a main part thereof, and FIG. It is the elements on larger scale of a part.

4A and 4B are diagrams illustrating a state in a method of manufacturing the optical space transmission device according to the embodiment, in which FIG. 4A is a side view illustrating a main part before a shield member is mounted, and FIG. It is a principal part side view which shows a situation.

5A and 5B are views showing a shield member used in the embodiment, wherein FIG. 5A is a front view thereof, and FIG. 5B is a side view thereof.

FIG. 5 shows a state in which a projection of the shield member is bent.
It is the elements on larger scale of area | region C of (b).

FIG. 7 is an essential part side view showing a state after a shield member is attached in the method for manufacturing an optical space transmission device according to the embodiment.

FIG. 8 is a main part side view showing a state after forming in the method of manufacturing an optical space transmission device according to the embodiment.

FIG. 9 is a side view showing a schematic structure of the optical space transmission device of the embodiment.

FIG. 10 is a block diagram illustrating an example of an optical space transmission device.

FIG. 11 is a diagram showing a waveform of an example of a communication system using the optical space transmission device.

12A and 12B are diagrams showing a schematic structure of a conventional optical space transmission device, wherein FIG. 12A is a side view showing a state before a shield member is attached, and FIG. 12B is a side view showing a state after the shield member is attached. (C) is a front view showing a state after the shield member is attached.

FIG. 13 is a flowchart showing steps of a conventional method for manufacturing an optical space transmission device.

FIG. 14 is a main part side view showing a state where a conventional optical space transmission device is mounted on a printed circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical space transmission device 1a, 1b Lead part 2 Frame 2a, 2b, 2c, 2d, 2'a Connection part 3 Mold part 5 Shield member 5a Projection part 5b Projection piece 5c Lead part 5d Side surface part 5e Contact part

Claims (7)

[Claims] 1. An optical space transmission device comprising at least a light emitting element, a light receiving element, and a signal processing circuit molded with resin to form a molded part, and a shield member mounted outside the molded part. An optical space transmission device, wherein the shield member has a projection which is bent and fixed to a front surface via a side surface of the mold portion. 2. The optical space transmission device according to claim 1, wherein an abutting portion is formed at an end of the protruding portion of the shield member so as to abut on the apex portion so as to abut on the mold portion. Optical space transmission device. 3. The optical space transmission device according to claim 1, wherein the shield member is provided with a protruding piece that contacts the bottom surface of the mold portion. 4. A method for manufacturing an optical space transmission device, comprising: molding at least a light emitting element, a light receiving element, and a signal processing circuit with a resin to form a molded part, and mounting a shield member outside the molded part. A molding member is formed by performing resin molding so that a plurality of the optical space transmission devices are connected to the frame of the optical space transmission device, and a shield member provided with a projection portion that is bent and fixed is provided on the optical space transmission device. After being mounted on the mold portion and bending and fixing the protrusion to the front surface via the side surface of the mold portion, the plurality of optical space transmission devices connected to the single frame are cut so as to be single. A method for manufacturing an optical space transmission device. 5. The method for manufacturing a free space optical transmission device according to claim 4, wherein after forming the mold portion, a frame connecting the plurality of free space optical transmission devices is connected to each of the free space optical transmission devices. 3. The method for manufacturing an optical transmission device according to claim 1, wherein a part of the portion is cut, and then the shield member is mounted on a mold portion of the optical space transmission device. 6. The method for manufacturing an optical transmission device according to claim 4, wherein the shield member is mounted on a mold portion of the optical space transmission device, and the protrusion is provided on a front surface via a side surface of the mold portion. After bending and fixing, at least a part of the lead portion of the optical space transmission device is bent, and at the same time, the plurality of optical space transmission devices connected to the single frame are cut so as to be unitary. A method for manufacturing an optical space transmission device, comprising: 7. The method for manufacturing an optical space transmission device according to claim 4, wherein a plurality of the shield members are arranged at positions corresponding to the plurality of optical space transmission devices connected to the single frame. A method for manufacturing an optical space transmission device, wherein the method is mounted on each of the optical space transmission devices, and the projection of the shield member is bent to be fixed to each of the optical space transmission devices.