JPH0631752Y2 - Light receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a light receiving device used for a light receiving unit of a remote control device for home electric appliances and other products.

<Prior Art> In a conventional light receiving device, for example, as shown in FIG. 9, a chip component 2 such as a resistor is mounted on a soldering surface 1a of a double-sided substrate 1, and a light receiving element 3 having low heat resistance is mounted on a non-soldering surface 1b. And the signal processing integrated circuit component 4 and the like are mounted. The light receiving element 3 is arranged on a metal pedestal 5 provided around and above the integrated circuit component 4 for electromagnetic shielding, positioning, and holding with the integrated circuit component 4.

The shield case 6 for electromagnetically shielding the double-sided substrate 1 and the light receiving element 3 is composed of a shield case body 7 and a shield plate 8 on the back side which are separately formed from each other. 8 is fixed by bending the engaging claw 9 of the shield case body 7.

In the figure, 10 is a terminal for electrically connecting the double-sided board 1 to the outside, 11 is a protrusion for holding the double-sided board 1, 12 is a foot for holding the shield case 6 on the external board, 13
Is a projection for retaining the foot 12.

<Problems to be Solved by the Invention> In the above-mentioned conventional technique, the light receiving element 3 needs to be mounted on the non-soldered surface 1b because the package material has low heat resistance. A pedestal 5 for electromagnetically shielding the integrated circuit component 4 is required, and a backside shield plate 8 is additionally required. Therefore, the number of parts increases, the assembly time becomes long, and the cost becomes high, which causes problems.

Therefore, the present invention can reduce the number of parts,
It is an object of the present invention to provide a light receiving device that can reduce the assembly time and is inexpensive.

<Means for Solving Problems> In the means for solving problems according to the present invention, as shown in FIGS. 1 to 6, a circuit board 22 having a light receiving element 21 mounted therein is housed in a shield case body 23, and the shield is provided. Case body 23
In the light receiving device in which the shield plate 25 is fixed to the back side of the engaging melon 24 by the caulking of the engagement melon 24, the light receiving element 21 is attached to the circuit board 22 via the lead pin 26 and the hole formed in the circuit board 22. 27, the shield plate 25 is formed by extending a part of the shield forming main body 23, and the shield plate 25 is provided with projections 28 and 29 that come into contact with the circuit board 22 from the back side. It has been done.

<Operation> In the problem solving means described above, the light receiving element 21 is mounted on the non-soldered surface of the circuit board 22 and soldered, and then the lead pin 26 is bent to form a hole 27 formed in the circuit board 22. It is inserted and distributed inside.

On the other hand, the shield case for electromagnetically shielding the light receiving element 21 includes a shield case body 23 and a shield plate 25 formed by extending a part of the shield case body 23, and by bending the shield plate 25. The shield case is completed.

Therefore, the number of parts can be reduced, the assembly time can be shortened, and the cost can be reduced.

Further, the shield plate 26 is fixed to the shield case main body 23 by bending and then crimping the engagement melon 24.
At this time, the protrusions 28 and 29 of the shield plate 23 are
Because it is in contact with the back side of 2, there is no excessive crimping,
Also, the crimping force can be easily adjusted.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional side view showing an embodiment of a light receiving device of the present invention, FIG. 2 is a side view showing a method of mounting a light receiving element, and FIG. 3 is a cross sectional plan view showing a mounting state of components, and FIG. The figure is also a front view of the shield case, FIG. 5 is a side view of the shield case, and FIG. 6 is a sectional view taken along the line BB of FIG.

As shown in the figure, the light receiving device of the present invention is a circuit board 22 on which a straight lead pin type light receiving element 21 is mounted.
Is housed in the shield case body 23, and the shield plate 25 is fixed to the back side of the shield case body 23 by caulking the engagement melon 24.

The light receiving element 21 is mounted on the circuit board 22 via a lead pin 26 and is fitted into a hole 27 formed in the circuit board 22 from the back side.

The shield plate 25 is formed by extending a part of the shield case main body 23, and the shield plate 25 is provided with projections 28 and 29 that come into contact with the circuit board 22 from the back side.

The lead pin 26 of the light receiving element 21 has an insertion hole 3 formed in the circuit board 22 as shown in FIGS.
0 is inserted from the non-soldered surface 22a side and soldered.
In the light receiving element 21, the lead pin 26 is bent after soldering so that the light receiving lens 21a has a soldering surface 22b.
The circuit board 22 is fitted and arranged in the hole 27 so as to face the side.

Further, as shown in FIGS. 1 and 3, the peripheral component 31 includes an integrated circuit component (IC) 32 for signal processing and a chip resistor 33.
Etc. In the figure, 34 is a terminal for connecting an electric circuit on the circuit board 22 to an external circuit (not shown), 35 is a protective resin for the integrated circuit component 32, and 36 is solder.

The shield case body 23 is composed of a metal plate arranged from the side edge 22c of the circuit board 23 to the soldering surface 22b side, and a recess 37 is formed on the upper surface 23a of the shield case body 23. The light receiving lens 21a of the light receiving element 21 is fitted into a hole 38 formed in the center of the light receiving element 21a.

The shield plate 25 is a non-soldered surface 22 of the circuit board 22.
It is a plate-shaped member arranged on the a side, and one side thereof is integrally connected to the shield case body 23. The other end 25a of the shield plate 25 is bent to form a shield wall between the light receiving element 21 and the terminal 34, and the end 25a
Another end portion 25b orthogonal to a serves as a shield wall between the light receiving element 21 and the integrated circuit component 32 as shown in FIG. The shield plate 25 is fixed to the shield case main body 23 by bending and crimping the engagement melon 24 of the shield case main body 23 so as to contact and hold the back surface 21b of the light receiving element 21. It

The protrusion 28 is formed by cutting out a part of the shield plate 25, and bending a connection part and an intermediate part of the cutout piece with the shield plate 25 to form a spring structure. The circuit board 2 is in contact with an earth pattern (not shown) formed on the attachment surface 22a.
2 functions as a holding and electrical connection.

The protrusion 29 is formed by cutting out a part of the shield plate 25 in the vicinity of the protrusion 28 and bending the shield plate 25 so as to maintain the gear gap between the back surface 21b of the light receiving element 21 and the shield plate 25. The protrusion 29 is provided at substantially the same position as the engagement melon 24.

Shield case body 23 and shield 25 before assembly
Is a shield case body 2 as shown in FIGS.
One of the side walls 3 is extended downward so that the two are integrated.

Therefore, the shield case S having the shape as shown in FIG. 1 is formed by bending the base side of the extending portion along the line AA.
The shield case S electromagnetically shields the area inside the alternate long and short dash line in FIG.

In the figure, 40 is a projection for holding the circuit board 22, 42 is a foot for attaching the shield case body 23 to another board (not shown), 43 is a projection for preventing the foot 42 from coming off, and 44 is a shield plate 25. Is a notch for escaping the projection 43 when the is bent, and 45 is a hole for facilitating bending of the shield case body 23 and the shield plate 25 along the line AA.

A method of arranging the components on the circuit board 22 in the above configuration will be described. First, the lead pin 26 of the light receiving element 21 is vertically mounted on the circuit board 22 from the non-soldered surface 22a using an insert machine or the like. At this time, if there are other leaded parts, they can be mounted at the same time. Then, soldering is performed by depping or the like. At this time, even if the package resin of the light receiving element 21 has low heat resistance, since the light receiving element 21 is of the straight lead pin type, soldering can be performed without any problem.

After that, when the lead pin 26 of the light receiving element 21 is bent,
The light receiving element 21 can be fitted and arranged in the hole 27 of the circuit board 22 from the non-soldered surface 22a side. Therefore, a part of the thickness of the light receiving element 21 is absorbed by the circuit board 22, and the entire thickness can be reduced. Further, the circuit board 22 can be single-sided, and the conventional metal pedestal is not required. The number can be reduced to reduce the cost.

Next, a method of assembling the shield case S will be described.

First, the circuit board 22 on which the light receiving element 21 and the like are mounted is inserted into the shield case body 23, and is positioned by the holding projection 40. Then, after bending along the line AA in FIG. 4, the engaging claws 24 are bent and caulked to complete the shield case S.

At this time, since one end of the portion serving as the shield plate 25 is bent, the shield wall 25a between the light receiving element 21 and the terminal 34 and the shield wall 25b between the light receiving element 21 and the integrated circuit component 32 are simultaneously formed. .

Therefore, since the shield case body 23 and the shield plate 25 are integrally formed, the assembly process of the shield case S can be shortened and the cost can be reduced.

When the shield plate 25 is fixed by crimping the engagement melon 24,
There is no problem if the shield plate 25 can be identified in parallel with the light receiving element as shown by the solid line in FIG. 1. However, if the caulking force of the engaging claw 24 is too strong, the shield plate 25 is distorted as a virtual line, and as a result, the light receiving element 21 The back surface is extremely pressed down, and the light receiving element 2
Circuit board 22 through the soldering portion of the lead pin 26 of No. 1
On the other hand, stress in the direction of arrow a may be applied. In such a case, the opposite side of the circuit board 22 floats in the direction of the arrow b, resulting in the position of the terminal 34 being displaced.

On the other hand, if the bending pressure at the time of crimping the engagement melon 24 is slightly weakened, the positional displacement of the terminal 34 can be improved to some extent, but if it is too weak, the shield case body 23 of the circuit board 22 is conversely reduced.
The fixing force to the will weaken, causing rattling. Further, the electrical connection with the shield ground pattern on the back surface of the circuit board 22 becomes incomplete, and the shield effect is lost.

However, in this embodiment, since the projection 28 having the spring structure is provided on the shield plate 25 and the projection 28 is brought into contact with the non-soldered surface 22a side of the circuit board 22, the circuit board 22
While maintaining the connection with the specified shield effect,
When the engagement melon 24 is crimped, it can hit the circuit board 22, eliminating excessive crimping as in the conventional case and facilitating adjustment of the crimping force.

Further, when the engagement gourd 24 is crimped, the protrusion 29 is formed on the circuit board 2.
The light receiving element 21 and the shield plate 25 are brought into contact with each other to secure the gear gap, so that no unreasonable force acts on the light receiving element 21.

Therefore, by using a part of the simplified shield case S, it is possible to solve the problems with the conventional structure without requiring more members, and to use the conventional production process, jigs and tools as they are. There is an advantage that can be done.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, as shown in FIGS. 7 and 8, a double-sided circuit board is used as the circuit board 22, and the copper foil 4 on the non-soldered surface 22a thereof is used.
If 6 is a ground pattern, the holes 2 of the circuit board 22
The shield plate 25 except for the portion covering the back surface side of 7 is unnecessary, and it is not necessary to cover the entire circuit board 22. Therefore, according to this structure, a tall component (capacitor or the like) 47 can be mounted on the non-soldered surface 22a of the circuit board 22. Also, in the embodiment, two protrusions 28,
However, only one of them may be provided. Therefore, when only the protrusion 29 is provided, this may be brought into contact with the ground pattern.

<Effects of the Invention> As is apparent from the above description, according to the present invention, the light receiving element is mounted on the circuit board through the lead pin and is fitted into the hole formed in the circuit board from the back side, and the shield plate is shielded. It is necessary to use a pedestal and a shield plate having a different structure as in the conventional case, because the shield plate is formed by extending a part of the case main body and the protrusion that comes into contact with the circuit board from the back side is provided. , The number of parts is reduced, the assembly time can be shortened, the cost is low, and there is no excessive caulking of the engagement gourd.
When the caulking force can be easily adjusted, it has an excellent effect.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the light receiving device of the present invention,
FIG. 2 is a side view showing the method of mounting the light receiving element, FIG. 3 is a cross-sectional plan view showing the mounting state of the components, FIG. 4 is a front view of the same shield case, and FIG. 5 is a side view of the same shield case. 6 and 6 are sectional views taken along the line BB of FIG. 4, FIG. 7 is a longitudinal sectional view showing another embodiment of the light receiving device of the present invention, and FIG. 8 is a front view of the same shield case, and FIG.
FIG. 1 is a vertical sectional side view showing a conventional light receiving device. 21: light receiving element, 22: circuit board, 23: shield case body, 24: engagement melon, 25: shield plate, 26: lead pin, 27: hole, 28, 29: protrusion.

Claims (1)

[Scope of utility model registration request] 1. A light receiving device in which a circuit board on which a light receiving element is mounted is housed in a shield case main body, and a shield plate is fixed to the back side of the shield case main body by caulking of an engagement melon, wherein the light receiving element is a lead pin. Is fitted to the circuit board through and is fitted into the hole formed in the circuit board from the back side, the shield plate is formed by extending a part of the shield case main body, and the shield plate,
A light receiving device, characterized in that a protrusion is provided which comes into contact with the circuit board from the back side.