JPH11145522A - Optical module drive - Google Patents

Abstract

(57) [Problem] To provide an optical module driving device for driving a mounted optical module and to simplify the assembling work. SOLUTION: By mounting an optical module 20 between a case 11 and a circuit board 12, a terminal 122 of the circuit board 12 comes into contact with a terminal connection pattern 233 while pressing the optical module 20 by elastic force. Accordingly, the optical module 20 can be connected to the circuit board 12 without soldering, and the optical module 20 can be fixed without requiring a complicated operation such as screwing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical module driving apparatus for driving an optical module, and more particularly to an optical module driving apparatus in which an optical module and a driving circuit board are integrally provided in one case.

2. Description of the Related Art Conventionally, an optical module driving device for driving a modularized optical semiconductor element has an optical module and a driving circuit board provided integrally in one case.

[0003]

2. Description of the Related Art Such an optical module driving device is designed so as to house the optical module as compactly as possible.

FIG. 14 is an exploded perspective view showing an example of the structure of a conventional optical module driving device. The optical module driving device 90 mainly includes a lid 91, an optical module 92, a circuit board 93, a case 94, and an aluminum plate 95. The lid 91 is made of a steel material, and a cutout 91b for allowing the optical fiber 92b of the optical module 92 to escape is formed in a part of the side surface 91a.

[0005] In the main body 92a of the optical module 92, L
An optical semiconductor element such as an ED is built in, and light emitted from the optical semiconductor element is output to the outside through an optical fiber 92b. Also, the optical module 92
Are provided with a plurality of terminals 92c for electrically connecting to the circuit of the circuit board 93.

[0006] Circuit components for driving the optical module 92 are mounted on the circuit board 93. A plurality of terminal connection patterns 93a are formed on the circuit board 93. Each terminal pattern 93a has an optical module 92
Terminal 92c is soldered. Also, the circuit board 93
Is formed with a notch 93b for mounting the optical module 92.

The case 94 is formed of a steel material, and the circuit board 93 is fixed to the claw portion 94c of the side plate 94a by soldering. In the case 94, a cutout 94b for the optical module 92 is formed from a part of the side plate 94a to a part of the bottom plate 94d.

When assembling such an optical module driving device 90, first, a circuit board 93 is fixed to a case 94, and the optical module 92 is inserted into the notches 93b and 94b of the circuit board 93 and the case 94. Further, an aluminum plate 95 is attached from the back of the case 94 with screws. At this time, the mounting pieces 92d and the like of the optical module 92 are also fixed to the aluminum plate 95 with screws. Then, each terminal 92c of the optical module 92 is connected to the circuit board 9
3 is soldered to the corresponding terminal connection pattern 93a. Finally, the lid 91 is put on from above. At this time,
The surface 91c having the notch 91b of the lid 91 is
4 and fixed to the surface 94e having the notch 94b by screws.

[0009]

However, in such a conventional optical module driving device 90, the optical module 92
It was necessary to insert the terminals 92 into the notches 93b of the circuit board 93 and screw them, and solder the terminals 92c one by one, resulting in poor workability.

The present invention has been made in view of such a point, and an object of the present invention is to provide an optical module driving device which is easy to assemble.

[0011]

FIG. 1 shows an optical module driving apparatus for driving a mounted optical module according to the present invention. As shown in FIG. A circuit board provided with a terminal for contacting the terminal connection pattern while pressing the optical module by elastic force; and a circuit board provided to sandwich the optical module between the case and the case. An optical module driving device is provided.

In such an optical module driving device 10, by mounting the optical module 20 between the case 11 and the circuit board 12, the terminals 122 of the circuit board 12
The optical module 20 comes into contact with the terminal connection pattern 233 while being pressed by the elastic force. Accordingly, the optical module 20 can be connected to the circuit board 12 without soldering, and the optical module 20 can be fixed without requiring a complicated operation such as screwing.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an exploded perspective view showing a schematic configuration of the optical module driving device according to the first embodiment of the present invention. The optical module driving device 10 mainly includes a case 11, a circuit board 12, an aluminum plate 13, and a lid 14.

The case 11 is formed of a steel material, and the circuit board 12 is fixed to the claw 111a of the side plate 111 by soldering. The case 11 has a rectangular notch 112a for the optical module 20 described later.
Are formed from approximately the center of the insertion side surface 111b to the vicinity of the center of the bottom plate 112. Also, the insertion side surface 111b
Are formed with grooves 111c and 111d, respectively.

Circuit components for driving the optical module 20 are mounted on the circuit board 12. In addition, a rectangular notch 121 is formed on the circuit board 12 at a position facing the notch 112 a of the case 11. The notch 121 is provided with a plurality of terminals 122 for electrically connecting the optical module 20 and a circuit. The specific shape of the terminal 122 will be described later.

The aluminum plate 13 is used as a part of the case 11 and is attached to enhance a heat radiation effect. This aluminum plate 13 has a notch 11
A concave portion 131 is formed at a position facing 2a. Aluminum plate 13 is fixed to the back surface of case 11 by screws (not shown).

The lid 14 is made of a steel material, and its side plate 141
A notch 141b for letting out the optical fiber 22 of the optical module 20 is provided substantially at the center of the insertion side surface 141a.
Are formed.

Such an optical module driving device 10 includes:
As shown in FIG. 3, the case 11, the circuit board 12, and the aluminum plate 13 are assembled, and the notches 112a,
1 and the insertion portion 110 formed by the recess 131,
The optical module 20 is mounted.

Next, a more specific structure of the optical module driving device 10 will be described. FIG. 4 is a plan view of the optical module driving device 10 of FIG. FIG. 5 is a sectional view taken along line XX of FIG. As shown in FIGS. 4 and 5, for example, four terminals 122 are respectively attached to both sides of the notch 121 of the circuit board 12. Each terminal 12
2, as shown in FIG.
Is formed so as to extend to the vicinity of the bottom plate 112. Such terminals 122 are formed so as to have spring properties as a whole. The specific shape of the terminal 122 will be described later.

As shown in FIG. 5, the end 112b of the notch 112a of the case 11 protrudes slightly from the end 131a of the recess 131 of the aluminum plate 13 toward the insertion side. Next, the configuration of the optical module 20 will be described.

FIG. 6 is a perspective view showing the structure of the optical module 20 according to the first embodiment of the present invention. Here, a part of the optical module 20 is shown in cross section. An optical semiconductor element such as an LED is built in the main body case 21 of the optical module 20, and the light emitted from the optical semiconductor element is output to the outside by an optical fiber 22.
At the end of the main body case 21 on the side of the optical fiber 22, a stepped portion 2 is provided.
11 and 212 are formed. Steps 211, 212
Is formed so as to substantially match the distance between the bottom surface of the concave portion 131 of the aluminum plate 13 and the lower surface of the circuit board 12.

In the optical module 20, a substrate 23 is formed. An optical semiconductor device (not shown) is connected to the substrate 23. Both side portions of the substrate 23 are exposed outside the main body case 21. A plurality of terminal connection patterns 233 that are in contact with the respective terminals 122 of the circuit board 12 are formed on the exposed surfaces 231 and 232 of the board 23. Also, stepped portions 231a, 231 are provided at the ends of the surfaces 231, 232 on the opposite side to the optical fiber 22, respectively.
32a are formed (however, the step portion 232a is not shown in FIG. 4). The height of the steps 231a and 232a is
The bottom surface of the concave portion 131 of the aluminum plate 13 and the bottom plate 1 of the case 11
12 is formed so as to substantially coincide with the distance between the lower surface 12 and the lower surface.

FIG. 7 is a perspective view showing a state where the optical module 20 of the first embodiment is inserted into the insertion section 110 of the optical module driving device 10. The optical module 20 includes a case 11
Is inserted into the insertion portion 110 such that the bottom surface of the concave portion 131 of the walking board 13 is slid. When the optical module 20 is inserted, the lid 14 is covered from above.

Next, the specific structure of the insertion side surface 141a of the lid 14 will be described. FIG. 8 is a diagram showing a specific structure of the insertion side surface 141a of the lid 14 of the first embodiment,
(A) is a view as seen from the insertion side, (B) is a view as seen from the back side, and (C) is a cross-sectional view along the line YY in FIG. (A).
As shown in FIGS. (A) and (B), the folded portions 141c and 141 are provided on both sides of the cutout 141b of the insertion side surface 141a.
d is formed. These folded portions 141c, 141
“d” is formed by bending a long piece formed in advance.

The lid 14 having such folded portions 141c and 141d is covered from above the case 11 in which the optical module 20 is inserted. FIG. 9 is a perspective view showing a state where the lid 14 is put on the optical module driving device 10 of the first embodiment. At this time, the insertion side surface 14 of the side plate 141 of the lid 14
1 a is fitted into the grooves 111 c and 111 d of the case 11. Then, a predetermined portion of the side plate 141 is screwed and fixed to the side plate 111 of the case 11, whereby the optical module driving device 10 is completed.

Next, the mounting state of the optical module 20 will be described in detail. FIG. 1 is a sectional view taken along the line ZZ in FIG. Since the optical module 20 mounted on the optical module driving device 10 is fitted with the concave portion 131 of the aluminum plate 13 and the notch 112a of the case 11, it is sufficiently fixed in a direction perpendicular to the paper surface. In addition, since the terminal 122 is pressed with a predetermined elastic force by the terminal 122 in contact with the terminal connection pattern 233, the terminal 122 is also fixed in the vertical direction. In addition, the electrical connection between the circuit board 12 and the optical module 20 can be reliably performed without performing soldering.

Further, in the optical module 20, the steps 211 and 212 of the main body case 21 abut on the circuit board 12,
Since the step portions 231a and 232a of the substrate 23 are fitted between the bottom plate 112 of the case 11 and the concave portion 131 of the aluminum plate 13, the fixing in the up-down direction is more reliably performed.

The fiber-side end surface 213 of the optical module 20 is pushed by the folded portions 141c and 141d of the lid 14 to the right in the drawing with an appropriate elastic force. Thus, the optical module 20 is prevented from coming off.

Next, the specific shape of the terminal 122 on the circuit board 12 will be described. 10A and 10B are diagrams showing a specific shape of the terminal 122 on the circuit board 12 side, wherein FIG. 10A is a plan view and FIG. 10B is a side view. Here, for example, terminal 1
22 is made of phosphor bronze for spring, the vertical length L1 is 3.0 mm, the width b1 of the contact portion 122a is 2.0 mm, and the length L3 of the fixed portion 122b to the substrate 12 is 2 mm. 0.0 mm. Further, other important factors such as the width b2 of the portion fixed to the substrate 12 and the thickness t of the member
1. The length L2 from the fixed portion 122b to the portion bent downward, and the respective curvature radii R1 and R2 of the two bent portions are:
It is determined based on the pressing force P of the optical module 20 against the terminal connection pattern 233 and the stress σ applied to the fixed portion 122b.

The following equation (1) holds between the stress σ and the pressing force P. σ = P × (L2 + R1 + R2) / S ··· (1) However, where an ^{S = b2 × t 2/6} . The fixing of the fixing portion 122b to the substrate 12 usually uses a silver solder. The limit value of the stress at this time is 9 kgf / mm ² . In addition, if the force required to press down the optical module 20 is 1.6 kgf, the pressing force per terminal 122 is 0.2 kgf. Considering the conditions of σ and P, the expression (1), the dimensions of the optical module driving device 10 and the optical module 20, etc., b2, t1,
L2, R1 and R2 are, for example, b2 = 4.0 m, respectively.
m, t1 = 0.3 mm, L2 = 0.5 mm, R1 = 1.
0 mm and R2 = 0.5 mm.

With the terminal 122 having such dimensions, the optical module 20 can be inserted into the insertion portion 110 with a relatively weak force of 1.6 kgf, while the optical module 20 can be inserted with a sufficient force. It is possible to hold. Also, the fixing portion 12 of the terminal 122 at this time
The stress σ applied to 2b so 6.7kgf / mm ^2, well below 9 kgf / mm ² limits, terminal 122
Does not have to be removed from the substrate 12.

In addition, the end of the terminal portion 122a of the terminal 122 is floated by about d1 = 0.3 mm, so that the optical module 20 can be prevented from being caught at the time of insertion and removal, and work can be performed more smoothly.

Next, another embodiment of the present invention will be described. FIG. 11 is an exploded perspective view showing a schematic configuration of the second embodiment of the present invention. Here, since the circuit board 12 and the lid 14 have substantially the same configuration as in the first embodiment, they are not shown. Also, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the optical module driving device 30 of the present embodiment, tapered surfaces 31 and 32 whose widths become wider toward the lower side are formed on the side surfaces of the concave portion 131 of the aluminum plate 13. On the other hand, a tapered surface 41 is also formed on the side surface of the substrate 23 of the optical module 40 so as to be fitted to the side surfaces 132 and 133 of the concave portion 131.

Thus, the optical module 40 after being mounted can be securely fixed in a direction other than insertion and removal. Also, terminal 1
The pressing force of 22 may be set to such an extent that electrical connection with the terminal connection pattern 231 can be made, so that selection and design of the material are simplified.

FIG. 12 is an exploded perspective view showing a schematic configuration of the third embodiment of the present invention. Here, as in FIG. 11, the circuit board 12 and the lid 14 are substantially the same as those in the first embodiment, and are not shown. Also, the first
The same components as those of the embodiment are denoted by the same reference numerals, and description thereof is omitted. In the optical module driving device 50 of the present embodiment, cutouts 51 and 52 are formed on the side surface of the concave portion 131 of the aluminum plate 13. On the other hand, on the side surface of the substrate 23 of the optical module 60, a hook 61 and the like that can be fitted with the notches 51 and 52 are formed.

Then, when the optical module 60 is slid and inserted, the notches 51 and 52 are fitted with the hooks 61 and the like, and the fixing in the insertion / removal direction becomes possible. Therefore,
The folded portions 141c and 141d of the lid 14 shown in FIG.
Need not be formed.

The width of the notch 112 a of the bottom plate 112 of the case 11 is made slightly smaller than the width of the recess 131 of the aluminum plate 13, so that the hook 61
Can be covered from above, and the vertical direction of the optical module 60 can be fixed.

FIG. 13 is an exploded perspective view showing a schematic configuration of the fourth embodiment of the present invention. Here, the circuit board 12 is also used.
The cover 14 and the cover 14 are substantially the same as those in the first embodiment, and are not shown. Also, the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the optical module driving device 70 of the present embodiment, contrary to the third embodiment of FIG.
72 are formed. On the side surface of the optical module 80, a concave portion 81 and the like to be fitted with the hooks 71 and 72 are formed.

Therefore, when the optical module 80 is slid and inserted, the hooks 71 and 72 and the concave portion 81 and the like are fitted to each other, and it is possible to fix the optical module 80 in the insertion / removal direction. Therefore, the folded portions 141c, 14c of the lid 14 shown in FIG.
There is no need to form 1d.

[0040]

As described above, according to the present invention, the optical module having the terminal connection pattern is sandwiched between the case and the circuit board, and the terminal is placed on the circuit board while pressing the optical module by elastic force. With the terminals that come into contact with the connection pattern, the optical module can be electrically connected to the circuit board without soldering, and the optical module can be securely mounted without complicated operations such as screwing. Can be fixed.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along the line ZZ in FIG.

FIG. 2 is an exploded perspective view showing a schematic configuration of the optical module driving device according to the first embodiment of the present invention.

FIG. 3 illustrates a case of the optical module driving device according to the first embodiment;
It is a perspective view which shows the assembly state of a circuit board and an aluminum plate.

FIG. 4 is a plan view of the optical module driving device of FIG. 3;

FIG. 5 is a sectional view taken along line XX of FIG. 4;

FIG. 6 is a perspective view illustrating a configuration of an optical module according to a first embodiment.

FIG. 7 is a perspective view showing a state where the optical module of the first embodiment is inserted into the insertion section 110 of the optical module driving device 10.

FIGS. 8A and 8B are diagrams showing a specific structure of an insertion side surface of the lid according to the first embodiment, where FIG. 8A is a view from the insertion side, FIG. 8B is a view from the back side, and FIG. It is sectional drawing which follows the YY line of FIG.

FIG. 9 is a perspective view showing a state where a cover is put on the optical module driving device of the first embodiment.

10A and 10B are diagrams showing specific shapes of terminals on the circuit board side, wherein FIG. 10A is a plan view and FIG. 10B is a side view.

FIG. 11 is an exploded perspective view showing a schematic configuration of a second embodiment of the present invention.

FIG. 12 is an exploded perspective view showing a schematic configuration of a third embodiment of the present invention.

FIG. 13 is an exploded perspective view showing a schematic configuration of a fourth embodiment of the present invention.

FIG. 14 is an exploded perspective view showing an example of the structure of a conventional optical module driving device.

[Explanation of symbols]

 Reference Signs List 10 optical module driving device 11 case 12 circuit board 13 aluminum plate 14 lid 20 optical module 21 main body case 22 optical fiber 23 substrate 122 terminal 233 terminal connection pattern

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Kuribayashi 2-1-1 Kitaichijo Nishi, Chuo-ku, Sapporo City, Hokkaido Inside Fujitsu Hokkaido Digital Technology Co., Ltd. (72) Inventor Shuichi Matsuura Kitaichijo-Nishi, Chuo-ku, Sapporo, Hokkaido 2-1-1 Fujitsu Hokkaido Digital Technology Co., Ltd. (72) Inventor Manabu Komiyama 4-1-1 Kamikadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (5)

[Claims] 1. An optical module driving device for driving a mounted optical module, wherein an optical module having a terminal connection pattern is provided so as to be sandwiched between the optical module and a case, and the optical module is pressed by an elastic force. An optical module driving device, comprising: a circuit board provided with a terminal that comes into contact with the terminal connection pattern. 2. The optical module driving device according to claim 1, wherein the cover for covering the optical module inserted into the case has a pressing portion for pressing the optical module with elastic force from the insertion direction. apparatus. 3. The light according to claim 1, wherein a tapered surface slidably fitted with a tapered portion formed in advance on a surface parallel to the insertion direction of the optical module is formed on the case side. Module drive. 4. A hook fitting portion, which is fitted on a hook formed on the optical module in advance and fixes the optical module in the insertion / removal direction, is formed on the case side. Item 2. The optical module driving device according to Item 1. 5. A hook portion for fixing the optical module in the insertion / removal direction is formed on the case side so as to be fitted in a concave portion formed in the optical module in advance. The optical module driving device as described in the above.