JP3235369B2 - Optical element module assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device module. More specifically, the present invention relates to an optical element module assembly including an optical element module including a light emitting element, a temperature control element, an optical system, and the like housed in a package, and an optical receptacle fitted with the optical element module. For new configurations.

[0002]

2. Description of the Related Art The use of optical signals is expanding in many fields, but at present, various signal processings are performed by converting them into electric signals. Therefore, electrical / optical converters are used everywhere in actual optical systems. On the other hand, an optical element such as a light emitting element or a light receiving element and a general semiconductor integrated circuit such as an amplifier circuit have different manufacturing processes, shapes, mounting methods, and the like. Is supplied as Therefore, when actually constructing an optical system, it is common to use an optical element module supplied as a product in which an optical element and an electronic circuit unavoidably attached to the optical element are integrated.

Further, a typical optical fiber as an optical signal transmission line for handling an optical signal has a very small core diameter through which the optical signal actually propagates. Matching is required. Therefore, when actually connecting an optical element module such as a plow and an optical connector attached to the end of an optical fiber, an optical receptacle for guiding the relative positioning of the two is used together. You.

FIG. 6 is a diagram showing a general configuration of an optical element module assembly used for the above-mentioned applications.

As shown in FIG. 1, the optical element module assembly mainly includes an optical element module 1 and an optical receptacle 2.

The optical element module 1 mainly includes an electronic circuit section 11 having a built-in electronic circuit and an optical system section 12 containing an optical system for coupling an optical element and an optical transmission line. The electronic circuit section 11 houses therein electronic circuits such as a drive circuit for a light emitting element and an amplifier circuit for a light receiving element, and further includes, at a rear end thereof, a plurality of electronic circuits used when connecting to other electronic circuits. The lead pins 13 are provided.

On the other hand, the optical system section 12 has a lens therein,
An optical component such as an isolator is housed therein, and is configured such that an optical coupling is realized by abutting a distal end on an end face of an optical fiber. Incidentally, optical elements such as a light emitting element and a light receiving element are mounted near a joint between the electronic circuit section 11 and the optical system section 12.

The optical receptacle 2 mounted on the optical element module 1 as described above has a cylindrical shape as a whole, and the optical element module 1 is inserted from the rear end 2a. The inside of the optical receptacle 2 on the distal end 2b side has a shape complementary to the optical connector attached to the end of the optical fiber cable, and the end face of the core of the optical fiber when the optical connector is inserted is described above. It is designed so that the tip of the optical system section 12 of the optical element module 1 exactly matches. Note that the actual optical receptacle 2 has a guide pin 21 used for positioning when this optical element module assembly is mounted on a substrate or the like.

Further, this type of optical element module assembly may be provided with a conductor cover 3 on the surface of the optical receptacle 2 as shown in FIG.

The conductor cover 3 mainly includes a shield portion 31 and a lead pin portion 32. Shield part 31
Is mounted so as to entirely cover the upper surface on the rear end 2a side of the receptacle 2. Further, the lead pin portion 32 protrudes below the optical receptacle 2 through the side surface of the optical receptacle 2. The lead pin portion 32 is used to fix the entire optical element module assembly including the optical element module 1 to a printed circuit board or the like, and at the same time, the shield section 31 is used.
Used to connect to a ground line on a printed circuit board. With the above configuration, the conductor cover 3 complements the electronic circuit inside the optical element module 1 from external electromagnetic noise, and at the same time, prevents the electromagnetic noise generated by the optical element from being copied to the outside. I have.

[0011]

Conventionally, the optical element module assembly constructed as described above has been mounted in the housing of various optical communication devices and connected to an optical fiber connector inside the housing. . However, with the spread of optical communication devices, versatility has been demanded, and a design that exposes the tip of the optical receptacle to the outside of the device housing has been adopted so that the optical fiber connector can be easily attached and detached according to the usage condition It is becoming. In such a structure, the distal end of the optical receptacle is inserted into a through hole formed in the front panel or the rear panel of the housing to be exposed to the outside.

However, as described above, in the structure in which the through-hole is formed in the casing of the device, the electromagnetic shield of the optical element module assembly may not function sufficiently.

That is, since the shield by the conductor cover mounted on the optical element module assembly is connected to the ground level only by the lead pin portion, the shield function is easily lost due to a slight connection failure or the like. In such a case, not only the optical element module itself is exposed to noise, but also noise generated by a light emitting element or the like in the optical element module affects other electronic circuits inside the device.

Further, in the conventional device, the metal housing itself plays the role of an electromagnetic shield. However, since noise leaks from the through hole opened for the optical element module assembly, the optical element module When the shielding function of the three-dimensional object itself is deteriorated, it is directly affected by an external magnetic field.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a novel structure in which the shielding function in the optical element module assembly is more complete and reliable.

[0016]

That is, according to the present invention, an optical element including at least one of a light emitting element and a light receiving element, an electronic circuit connected to the optical element, and the optical element and the electronic circuit are integrated. In an optical element module assembly including an optical element module having an insulating case to be accommodated, and an optical receptacle mounted on the optical element module, a position covering the optical element module mounted on the optical receptacle. A conductive cover attached to the surface of the optical receptacle, and an elastic connecting member electrically connected to the conductive cover, and having a shape near the distal end and away from the optical receptacle. An optical element module assembly is provided.

[0017]

The main feature of the optical element module assembly according to the present invention is that the optical element module assembly is provided with a connection member for electrically connecting its own shield member to the housing of the device on which it is mounted. Another important feature is that the connection of the connection member to the housing is automatically realized when the optical element module assembly is mounted.

That is, the optical element module assembly according to the present invention includes a conductor cover attached to the surface of the optical receptacle and a connection member formed of an elastic conductive material. This connection member has a shape such that at least a part thereof is gradually separated from the surface of the optical receptacle, and when the tip of the optical element module assembly is inserted into the through hole of the housing, It has a shape that makes inevitable contact with the crab. Therefore, the optical element module assembly provided with such a connection member can reliably exhibit the shielding function only by mounting in the same manner as the conventional optical element module assembly.

Hereinafter, the present invention will be described more specifically with reference to the drawings. However, the following disclosure is merely an embodiment of the present invention and does not limit the technical scope of the present invention.

[0020]

FIG. 1 is a diagram showing a specific configuration example of an optical element module assembly according to the present invention. Common elements are common to those of the conventional optical element module assembly shown in FIG. Reference numbers are assigned.

As shown in the figure, this optical element module assembly is configured by adding a connecting member 33 to the conventional optical element module assembly shown in FIG. Actually, in this embodiment, the connection member 33 is formed by bending one end of the shield portion 31 of the conductor cover 3 to protrude.

FIG. 2 is a schematic diagram for explaining the function of the optical element module assembly shown in FIG.

As shown in FIG. 2A, the tip of the optical element module assembly is inserted into a through hole H formed in a panel P of a housing during mounting. At this time, the connection portion 33 of the conductor cover 3 mounted on the optical element module assembly according to the present invention comes into contact with the inside of the through hole H of the panel P as shown in FIG. Therefore, the shield part 31 is
33 is connected to the frame ground.

In view of the function of the connecting portion 33,
In the state shown in FIG. 2B, it is preferable that the dimensions are such that the contact portion is pressed into the through hole H by utilizing the elastic deformation of the bent portion of the connection portion 33.

FIG. 3 is a diagram showing a modification of the embodiment shown in FIG.

As shown in the figure, this optical element module assembly has the same configuration as the conventional optical element module assembly shown in FIG. Here, the connection member 34 is formed by connecting a mountain-shaped member having a plurality of parallel slits to the end of the conductor cover 3 by electric welding.

In such a configuration, since the connection member 34 having reduced rigidity is easily deformed by the formation of the slit, the insertion into the through hole is facilitated and a good connection is realized. Also, by forming the connecting member 34 as a separate component,
A suitable material having a higher elasticity can be used. Specifically, a phosphor bronze alloy or the like having a thickness of 0.1 mm can be preferably used for a conductor cover which is usually formed of a brass plate having a thickness of about 0.5 mm.

Further, according to a preferred aspect of the present invention, it is desirable that the slits formed in the connecting member are arranged at irregular intervals so that the intervals are different from each other. The reason is that, when the interval between the slits is fixed, resonance may occur at a specific frequency.

FIG. 4 is a view showing still another example of the structure of the optical element module assembly according to the present invention.
Components common to those described above are denoted by common reference numerals.

As shown in the figure, the connecting member 35 mounted on the optical element module assembly in this embodiment is composed of a plurality of thin strip-shaped metals fixed at one end to the end of the conductor cover 31 by electric welding. It is formed by pieces. Each connecting member 35 is curved in an arc shape and has elasticity.

As shown in FIG. 5, the connecting member as described above
In the optical element module assembly provided with 35, the connection member contacts the inside of the panel P. Therefore, there is no need to insert a connection member inside the through hole H of the housing. For this reason, even when the gap between the optical receptacle 2 and the inner surface of the through hole H of the panel P is very narrow, good connection between the housing and the conductor cover can be realized. Further, in this embodiment, since the panel P and the connection member 35 come into contact with each other at a plurality of places, even if some of the connection members are in poor contact for some reason, conduction between the panel and the conductor cover is ensured.

[0032]

As described above in detail, in the optical element module assembly according to the present invention, the unique structure of the conductor cover allows the conductor cover and the housing to be electrically connected only by ordinary mounting. , And good shielding characteristics can be reliably obtained.

Further, since the above connection is automatically formed when the optical element module is mounted, the number of assembling steps does not increase due to the shield.

[Brief description of the drawings]

FIG. 1 is a diagram showing a specific configuration example of an optical element module assembly according to the present invention.

FIG. 2 is a view for explaining functions of the optical element module assembly shown in FIG. 1;

FIG. 3 is a diagram showing another configuration example of the optical element module assembly according to the present invention.

FIG. 4 is a view showing still another configuration example of the optical element module assembly according to the present invention.

FIG. 5 is a view for explaining functions of the optical element module assembly shown in FIG. 4;

FIG. 6 is a diagram showing a configuration of a general optical element module assembly.

FIG. 7 is a diagram showing a configuration of a conventional optical element module assembly provided with a conductor cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Package, 2 ... Optical receptacle, 3 ... Conductor cover, 11 ... Electronic circuit part, 12 ... Optical system part, 13 ... Lead pin part, 21 ... Guide pin, 31 ... shield part, 32 ... lead pin part, 33, 34, 35 ... connection member, P ... panel, H ... through-hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02B 6/42 H01L 31/0232

Claims (5)

(57) [Claims] 1. An optical device comprising: an optical device including at least one of a light emitting device and a light receiving device; an electronic circuit connected to the optical device; and an insulator case integrally housing the optical device and the electronic circuit. In an optical element module assembly including an element module and an optical receptacle mounted on the optical element module, the optical module module is mounted on a surface of the optical receptacle at a position covering the optical element module in a state mounted on the optical receptacle. An optical element module assembly comprising: a conductor cover; and an elastic connection member that is electrically connected to the conductor cover and has a shape that is away from the optical receptacle near a distal end. 2. The optical element module assembly according to claim 1, wherein said conductor cover and said elastic connecting member are integrally formed with each other. 3. The optical element module assembly according to claim 1, wherein said elastic connecting member has a physical shape that is easily deformed. 4. The optical element module assembly according to claim 3, wherein the elastic connecting members are formed with a plurality of slit-shaped holes formed at unequal intervals so that rigidity is reduced. An optical element module assembly characterized by being constituted. 5. The optical element module assembly according to claim 1, wherein said connecting member is made of a material which is easily elastically deformed. Module assembly.