JP2001068722A - Electromagnetic shielding cap for infrared data communication module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap, which can be fixed on an electronic component at low cost and efficiently, for an electromagnetic shielding of the electronic component. SOLUTION: This cap is an electromagnetic shielding cap 11 wherein lens parts 6 and 7 to change an infrared optical path are mounted on a protruded infrared data communication module 1 to perform the electromagnetic shielding of the module 1, and the cap 11 is provided with tongue piece parts 14 and 15, which respectively have arcuate parts 14a and 15a abutting on the parts 6 and 7 and prevents the parts 6 and 7 from coming out of the module 1 by these tongue piece parts 14a and 15a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap mounted on an infrared data communication module to perform electromagnetic shielding.

[0002]

2. Description of the Related Art In an infrared data communication module, an electromagnetic shield is provided to prevent the influence of external noise. This electromagnetic shield is realized by the case where the wiring board itself on which the infrared data communication module is mounted is housed in a metal case, so it is necessary to apply the electromagnetic shield individually to the infrared data communication module itself. Is not necessarily. However, in recent years, demand for portable devices such as portable telephone devices has been rapidly increasing, and in such portable devices, there is a tendency not to employ a metal casing for weight reduction. In such a case, an electromagnetic shield is provided by attaching a metal cap to the infrared data communication module.

[0003] In order to prevent the electromagnetic shielding cap of the conventional infrared data communication module from falling off when the infrared data communication module is mounted on a wiring board, the infrared data communication module is provided with an adhesive. Was fixed to.

[0004]

However, in such a conventional cap for electromagnetic shielding of an infrared data communication module, an adhesive is used to fix the infrared data communication module to the infrared data communication module, so that the material cost of the adhesive itself is reduced. In addition to the above, there is a problem that a step for applying an adhesive is required, which causes a decrease in productivity and an increase in equipment cost.

The present invention was conceived under such circumstances, and it is an object of the present invention to provide an electromagnetic shielding cap for an infrared data communication module which can be fixed at low cost and efficiently to an electronic component. And

[0006]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems, the present invention takes the following technical means.

According to a first aspect of the present invention, there is provided a cap mounted on an infrared data communication module having a protruding lens portion for changing an optical path of infrared light to perform electromagnetic shielding of the infrared data communication module, An electromagnetic shielding cap for an infrared data communication module is provided, wherein a tongue piece having a curved surface portion abutting on a lens portion is provided, and the tongue piece prevents the infrared data communication module from coming off. Is done.

According to a preferred embodiment, the curved surface portion of the tongue piece abuts on the outer periphery of the lens portion on the downstream side in the insertion direction of the cap into the infrared data communication module.

As described above, since the tongue portion having the curved surface portion which comes into contact with the lens portion is provided and the escape from the infrared data communication module is prevented by the tongue portion, the electronic device can be used without using an adhesive. It is possible to prevent the cap for the electromagnetic shield from falling off from the component. Moreover, since the detachment is prevented by using the lens portion of the infrared data communication module, it is not necessary to take special measures to prevent the electromagnetic shielding cap from falling off the infrared data communication module.

[0010] For example, by forming the curved surface portion of the tongue portion into contact with the portion of the outer periphery of the lens portion on the downstream side in the insertion direction of the cap into the infrared data communication module, the infrared data communication module is attached to the cap. When a force is applied in the direction in which the lens unit exits, the contact between the outer periphery of the lens unit and the curved surface portion can favorably prevent the exit.

Therefore, it is possible to inexpensively and efficiently fix the electronic component.

[0012] Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a front view of an infrared data communication module equipped with an electromagnetic shielding cap according to the present invention,
2 is a plan view, FIG. 3 is a bottom view, FIG. 4 is a rear view, FIG. 5 is a right side view, and FIG. 6 is a left side view.
FIG. 7 is a front view of the infrared data communication module in a state where the electromagnetic shielding cap is not mounted.
FIG. 2 is a front view of the electromagnetic shielding cap.

The infrared data communication module 1 has a substrate section 2 and a sealing section 3. The substrate section 2 is made of, for example, glass epoxy, and has a plurality of through holes 4 as shown in FIG. On the back side of the infrared data communication module 1 of the substrate portion 2, as shown in FIG. 4, an electrode 5 integral with the conductor inside the through hole 4 is formed. Although not shown on the board part 2,
A light-emitting diode chip as an infrared light-emitting element, a pin photodiode chip as an infrared light-receiving element, and a control LSI chip are mounted.

The sealing portion 3 is made of, for example, an epoxy resin containing a pigment, and is formed on the substrate portion 2 by a transfer molding method. The sealing portion 3 is not transparent to visible light, but transmits infrared light sufficiently well. Hemispherical lens portions 6 and 7 are formed integrally with the sealing portion 3. The lens unit 6 gives directivity to the light receiving characteristics of the pin photodiode chip, and the lens unit 7 gives directivity to the light emitting characteristics of the light emitting diode chip.

A large number of infrared data communication modules 1 can be obtained by cutting a large substrate. That is,
A predetermined wiring pattern or through hole is provided on a large substrate, and a large number of light emitting diode chips, pin photodiode chips, and LSI chips are mounted thereon at an appropriate pitch, and wire bonding is performed at required locations.
After sealing with a resin by the transfer mold method, a large number of infrared data communication modules 1 are obtained by cutting a large substrate vertically and horizontally using a cutter or the like. The dimension of the infrared data communication module 1 in the horizontal direction, that is, the horizontal direction in FIG. 7 is about 7 mm, the vertical direction, that is, the dimension in the vertical direction in FIG. It is about 2 mm including the lens portions 6 and 7.

When cutting a large substrate, the portion of the through hole 4 is cut along the axial direction of the through hole 4 so that substantially half of the cylindrical through hole 4 remains. As a result, as shown in FIG. 3, the through hole 4 is exposed on the bottom surface side of the infrared data communication module 1 of the substrate portion 2.

The electromagnetic shield cap 11 is made of metal, and is fitted in the direction of arrow A in FIG. 1 when mounted on the infrared data communication module 1. This electromagnetic shielding cap 11 is box-shaped with an open bottom surface and a front surface. As shown in FIG. 1, from the center of the front side end of the plane, the front center of the infrared data communication module 1 is The covering first bent portion 12 protrudes. This first bent part 1
2 is located between the lens unit 6 and the lens unit 7 of the infrared data communication module 1. From the tip of the first bent portion 12, a second bent portion 13 protruding in parallel with the bottom surface of the infrared data communication module 1 is projected. This second bent portion 13
The bottom surface is substantially flush with the bottom surface of the infrared data communication module 1, and is soldered to a wiring board on which the infrared data communication module 1 is mounted as necessary.

As shown in FIG. 5, a tongue piece 14 having a predetermined width and projecting downward from the end on the lens unit 7 side is provided on the right side surface of the cap 11 for electromagnetic shielding.
As shown in FIGS. 1 and 8, the tongue piece 14 has an arc-shaped portion 14 a as a curved surface portion along the outer periphery of the lens portion 7, and the tip of the arc-shaped portion 14 a Folded portion 14b extending outward along the bottom surface, that is, to the right side of infrared data communication module 1
And The distal end face of the folded portion 14b is substantially flush with the right side face of the cap 11 for electromagnetic shielding.

As shown in FIG. 6, a tongue piece 15 having a predetermined width protrudes downward from the end on the lens section 7 side, as shown in FIG.
As shown in FIGS. 1 and 8, the tongue piece 15 has an arcuate portion 15 a as a curved surface portion along the outer periphery of the lens portion 6, and the tip of the arcuate portion 15 a of the infrared data communication module 1. Folded portion 15b extending outward along the bottom surface, that is, to the left side of infrared data communication module 1
And The tip surface of the folded portion 15b is substantially flush with the left side surface of the electromagnetic shielding cap 11.

When mounting the electromagnetic shielding cap 11 on the infrared data communication module 1, for example,
By setting the infrared data communication module 1 and the electromagnetic shield cap 11 at appropriate positions in an automatic mounting device (not shown), the electromagnetic shield cap 11 is fitted into the infrared data communication module 1 in the direction of arrow A in FIG. At this time, since the tongue pieces 14, 15 are formed on the electromagnetic shielding cap 11, the tongue pieces 14, 15 are formed.
Is slightly pushed outward by the lens portions 6 and 7 of the infrared data communication module 1, and the tongue pieces 14 and 1 are
5 slides on the outer circumference of the lens portions 6 and 7, and the electromagnetic shielding cap 11 is completely attached to the infrared data communication module 1, so that the arc-shaped portions 14a and 15a of the tongue pieces 14 and 15 become lens portions. A state is reached in which the outer circumferences of 6 and 7 are held.

Therefore, the electromagnetic shielding cap 11
Even if a force is applied to the electromagnetic shielding cap 11 in the direction opposite to the direction of arrow A in FIG.
Since the outer peripheries of the lens portions 6 and 7 are embraced by 15a, the electromagnetic shield cap 11 is prevented from coming out of the infrared data communication module 1 satisfactorily.

Thus, the electromagnetic shielding cap 11
Since the tongue pieces 14 and 15 are formed, the electromagnetic shielding cap 11 is prevented from falling off from the infrared data communication module 1 without using an adhesive, so that the electromagnetic shielding cap 11 can be manufactured inexpensively and efficiently. Can be fixed to electronic components. Moreover, the infrared data communication module 1
The infrared data communication module 1 is provided with an electromagnetic shielding cap
There is no need to take any special measures to prevent the 1 from falling off.

Although the two tongue pieces 14 and 15 are provided in the above embodiment, only one of them may be provided. When there are three or more lenses, three or more tongue pieces may be provided.

In the above embodiment, the tongue piece 1
The arc portions 14a and 15a of the lens portions 4 and 15 are
The outer periphery of the infrared data communication module 1 is configured to abut on the downstream side in the insertion direction of the electromagnetic shielding cap 11 into the infrared data communication module 1.
When the insertion direction of the electromagnetic shielding cap 11 into the lens unit 6 is parallel to the axial direction of the lens units 6 and 7, the tongue pieces 14 and 15
It is sufficient to press the lens portions 6 and 7 by the elastic restoring force of the electromagnetic shield cap 11 to prevent the electromagnetic shield cap 11 from falling off.

In the above embodiment, the tongue piece 1
Although the arc-shaped portions 14a and 15a are provided as the curved portions of the lenses 4 and 15, the curved portions do not necessarily have to be arc-shaped in cross section, and may have any cross-sectional shape along the outer periphery of the lens portions 6 and 7.

In the above embodiment, the lens portions 6 and 7 are formed integrally with the sealing portion 3.
It is not always necessary to integrally form the sealing part 3 with the sealing part 3.

[Brief description of the drawings]

FIG. 1 is a front view of an infrared data communication module equipped with an electromagnetic shielding cap according to the present invention.

FIG. 2 is a plan view of the infrared data communication module shown in FIG.

FIG. 3 is a bottom view of the infrared data communication module shown in FIG. 1;

FIG. 4 is a rear view of the infrared data communication module shown in FIG. 1;

FIG. 5 is a right side view of the infrared data communication module shown in FIG. 1;

FIG. 6 is a left side view of the infrared data communication module shown in FIG. 1;

FIG. 7 is a front view of the infrared data communication module without the electromagnetic shielding cap according to the present invention.

FIG. 8 is a front view of the electromagnetic shielding cap according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infrared data communication module 6 Lens part 7 Lens part 11 Cap for electromagnetic shielding 14 Tongue piece part 14a Arc-shaped part 14b Folded part 15 Tongue piece part 15a Arc-shaped part 15b Folded part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 9/00 F term (Reference) 5E321 AA01 BB44 CC03 GG05 5F088 AA03 EA09 JA06 JA12 JA20 LA01 5F089 AA01 AA02 AC11 AC23 AC26 BC23 BC24 CA11 5K002 AA05 AA07 BA14 BA15 CA02 FA03 GA07 5K023 AA07 BB28 MM00

Claims (2)

[Claims] 1. A cap which is mounted on an infrared data communication module provided with a lens portion for changing an optical path of infrared light and protrudes to provide an electromagnetic shield for the infrared data communication module. A cap for electromagnetic shielding of an infrared data communication module, wherein a tongue piece is provided to prevent the infrared data communication module from coming out of the infrared data communication module. 2. The infrared light according to claim 1, wherein the curved surface portion of the tongue piece abuts on a portion of an outer periphery of the lens portion on a downstream side in a direction in which the cap is inserted into the infrared data communication module. Cap for electromagnetic shield of data communication module.