JPH09321480A - Sealed structure of substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed structure of a board in which an effective utilization region on a circuit board is not limited by arrangement of a sealed body and a dimension of a case is unrequited to increase. SOLUTION: This embodiment has a circuit board 1 provided with one more projection parts 4 and recess parts 5 respectively in at least one side edge part of the side edge parts counter to each other in a longitudinal direction; and a cylindrical sealed body 6 enclosing the circuit board 1 so as to be along the side edge parts counter to each other in a longitudinal direction, and a hole 7 with which the projection part 4 of the circuit board 1 is engaged is provided in the cylindrical sealed body 6. After the projection part 4 is engaged with the hole 7, an engagement portion is soldered, and the cylindrical sealed body 6 is fixed and disposed in the circuit board 1 and also the cylindrical sealed body 6 is grounded and connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of a board, and particularly when the circuit board is enclosed by a cylindrical shield body and the circuit board is shielded, it is easy to solder the circuit board and the shield body together. In addition, the present invention relates to a shield structure of a substrate that enables the use of a relatively small shield body.

[0002]

2. Description of the Related Art Generally, a pen type bar code scanner is
Light emitted from the light emitting element located at the tip of the case is projected onto the barcode, the reflected light of the barcode is read by the light receiving element also located at the tip of the case, and the read barcode signal has low noise. The signal is amplified by the amplifier and the amplified barcode signal is supplied to the signal processing unit. A circuit board is fixedly arranged along the length direction in the case, and a low noise amplifier is mounted on the circuit board.

Further, in the known bar code scanner, when external noise is applied, a low noise amplifier, especially,
Since the input stage part of the low noise amplifier is greatly affected by external noise, the circuit board of the part where the low noise amplifier is mounted is usually shielded. In this case, the means for shielding the low-noise amplifier is to cover the part of the circuit board on which the low-noise amplifier is mounted with a shield body such as a shield case or copper shield tape, and solder the shield body to the ground potential point of the circuit board. It is known that the circuit board has a low-noise amplifier mounting part enclosed by a cylindrical shield body and part of the cylindrical shield body is soldered to the ground potential point of the circuit board. There is.

Here, FIG. 4 is a sectional view showing a schematic structure of a known pen type bar code scanner, (a) is a longitudinal sectional view, (b) is a lateral sectional view, and FIG. 5 is a sectional view. 5 is an exploded perspective view showing an example of a shielded circuit board used in the barcode scanner shown in FIG. 4. FIG.

As shown in FIGS. 4 (a) and 4 (b), a bar code scanner 40 includes a bottomed cylindrical case 41 and a conical tip 42 which is arranged to be joined to an opening of the case 41.
A pair of ribs 43 arranged to face each other along the length direction of the case 41, a rectangular circuit board 44 fixedly arranged in the case 41 by the pair of ribs 43, a light emitting element and a light receiving element ( (Not shown), a compression spring 46 arranged between the bottom of the case 41 and one end of the circuit board 44 to set the position of the circuit board 44 in the case 41 in the longitudinal direction, and a circuit board. And a pair of shield bodies (shield cases) 47 arranged so as to separately cover both sides of a part of 44.

The circuit board 44 is sandwiched between the side edges in the longitudinal direction, which are opposed to each other, by a pair of ribs 43 arranged in the case 41 so as to be fixed in the case 41. At the same time, the circuit board 44 is fixed to the case 4 by the compression spring 46 arranged between one end of the circuit board 44 and the bottom of the case 41.
The arrangement position in the length direction within 1 is set. Sensor unit 45
Is attached to the other end of the circuit board 44, and the circuit board 4
4 is fixedly arranged in the case 41, the tip portion 42
Located inside. A low noise amplifier (not shown) is mounted on the other end side of the circuit board 44, and a portion where the low noise amplifier is mounted is provided from both sides of the circuit board 44 with a pair of shields 4.
Shielded by 7.

Further, as shown in FIG. 5, the circuit board 4
4, a rib holding region 44A is provided at a side edge portion in the longitudinal direction, and a ground pattern region 48 is provided on a part of the inside of the opposing rib holding region 44A on both surfaces of the circuit board 44. The ground pattern areas 48 on both surfaces of the circuit board 44 are
Are electrically connected by a plurality of through holes 49 provided in the. The pair of shield bodies 47 are U-shaped in cross section and have a flange portion 47A at the tip of the leg portion that comes into contact with the circuit board 44, and are attached to opposite portions of both surfaces of the circuit board 44.

When the shield body 47 is attached to the circuit board 44, the collar portion 47A is connected to the ground pattern area 48.
Then, a part of the contact surface between the collar portion 47A and the pattern region 48 is soldered, and the pair of shield bodies 47 are attached to both surfaces of the circuit board 44.

[0009]

In the known bar code scanner 40, when the pair of shield bodies 47 are mounted on both surfaces of the circuit board 44, the brim portion is provided in the ground pattern area 48 provided inside the rib holding area 44A. Since 47A is soldered, there is a problem that the effective use area (mounting area) on the circuit board 44 on which the low noise amplifier or the like is mounted is limited by the arrangement of the shield body 47.

On the other hand, in order to ensure a sufficient effective use area (mounting area) of the circuit board 44, the circuit board 44
Increasing the size of (1) increases the size of the case in which the circuit board 44 is fixedly arranged, which causes a problem that the usability of the bar code scanner 40 deteriorates and the manufacturing cost of the bar code scanner 40 increases.

The present invention solves all of these problems, and the purpose thereof is that the effective utilization area on the circuit board is not limited by the arrangement of the shield body, and it is necessary to increase the size of the case. Not to provide a shield structure for the substrate.

[0012]

In order to achieve the above object, a shield structure of a substrate according to the present invention has one or more side shields on at least one of the opposing side edges of the circuit board in the longitudinal direction. The concave portion and the convex portion are provided, and a hole to be fitted into the convex portion of the circuit board is provided on the side surface of the cylindrical shield body that encloses the circuit board.

According to this structure, when the circuit board is enclosed by the cylindrical shield body, the convex portion provided on the circuit board is fitted into the hole provided on the side surface of the shield body so that the fitted portion is fixed. By doing so, it is not necessary to provide a portion for fixing the shield body on the circuit board, for example, a ground pattern region having a plurality of through holes unlike the shield structure of a known board.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the first embodiment of the present invention, a shield structure of a substrate is provided with one or more recesses and protrusions on at least one of the opposing side edges in the longitudinal direction. The circuit board is provided, and a cylindrical shield body that encloses the circuit board is provided along the opposing side edges in the longitudinal direction, and the shield body is provided with a hole to be fitted into the convex portion of the circuit board. There is something.

In the second embodiment of the present invention, the shield structure of the substrate has conductive regions formed on both sides of the convex portion, and the circuit board is enclosed by the cylindrical shield body and the circuit is formed. When the hole of the shield body is fitted into the convex portion of the board, the fitting portion is soldered to fix the shield body to the circuit board.

In the third embodiment of the present invention, the shield structure of the board is such that, when the circuit board is enclosed by the cylindrical shield body, the flat shield body is wrapped around the circuit board,
The overlapping edge portions of the flat plate-shaped shield body are soldered to form a cylindrical shield body that encloses the circuit board.

In the fourth embodiment of the present invention, the shield structure of the substrate has a tongue-shaped piece provided on a part of the tubular shield body, and when the circuit board is enclosed by the tubular shield body, The strips are soldered to the ground pattern area of the circuit board.

In the fifth embodiment of the present invention, in the shield structure of the board, the circuit board is fixedly arranged in the case of the bar code scanner, and the amplifier for amplifying the bar code read signal is provided on the circuit board. Is installed.

According to the first embodiment of the present invention, when the circuit board is enclosed by the cylindrical shield body, the convex portion provided on the circuit board is fitted into the hole provided on the side surface of the shield body. Since it is fixed, there is no need to separately provide a portion for fixing the shield body on the circuit board, and the effective use area (mounting area) of the circuit board can be widened accordingly.
There is no need to increase the size of the circuit board or the case that houses the circuit board.

According to the second embodiment of the present invention, when the convex portion provided on the circuit board is fitted and fixed in the hole provided on the side surface of the shield body, the fitted portion is soldered. Therefore, in addition to the function obtained in the first embodiment of the present invention, there is a function that the ground connection of the shield body can be easily performed.

According to the third embodiment of the present invention, when the circuit board is enclosed by the tubular shield body, the flat shield body is wound around the circuit board and the end edge portion is soldered to the tubular shield body. Since the shield body is formed into a shape, it has the function of easily assembling the shield body in addition to the function obtained in the first embodiment of the present invention.

According to the fourth embodiment of the present invention, since the tongue-shaped piece is soldered to the ground pattern area of the circuit board when the circuit board is enclosed by the cylindrical shield body, There is a function that the shield body can be surely connected to the ground without impairing the function obtained in the first embodiment.

According to the fifth embodiment of the present invention, it is possible to perform processing such as amplification of a bar code read signal without enlarging the case of the bar code scanner and minimizing the influence of external noise. There is a function.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the structure of the shield structure for a substrate according to the first embodiment of the present invention, and shows an example when applied to a pen type bar code scanner.

As shown in FIG. 1, the circuit board 1 has an elongated rectangular shape, and has a light emitting element (not shown) for irradiating a bar code at one end and a light receiving element for receiving reflected light of the bar code (also the same). The sensor unit 2 including (not shown) is attached and arranged, and three convex portions 4 and three concave portions 5 are provided on a part (one end side) of the facing side edge portion 3 in the longitudinal direction. A low noise amplifier (not shown) that amplifies a bar code read signal is attached to a portion of the circuit board 1 where the convex portion 4 and the concave portion 5 are formed. The cylindrical shield body 6 encloses and shields the circuit board 1 in the portion where the low noise amplifier is mounted, and the convex portion 4 is fitted at a position corresponding to the arrangement position of the convex portion 4 of the circuit board 1. A hole 7 is provided. In this embodiment, in order to form the tubular shield body 6, the flat shield body 6 is wound around the circuit board 1, and the holes 7 on the shield body 6 side are formed on the convex portions 4 on the circuit board 1 side when winding. The tubular shield body 6 is formed by fitting and soldering the overlapping edge portions. Further, in this embodiment, conductive regions coated with a conductor are formed on both surfaces of at least one of the protrusions 4 provided on the circuit board 1, and the holes 7 of the shield body 6 are formed in the protrusions 4.
When the fitting is performed, the fitting portions on both surfaces of the convex portion 4, that is, the contact portions between the conductive regions on both surfaces of the convex portion 4 and the holes 7 of the shield body 6 are soldered. The cylindrical shield body 6 is fixedly arranged on the circuit board 1 via the.

FIG. 2 is a sectional view showing an example of a schematic structure of a pen type bar code scanner to which the circuit board shown in FIG. 1 is attached and arranged. FIG. 2A is a longitudinal sectional view and FIG. It is a side view.

In FIGS. 2A and 2B, the same components as those shown in FIG. 1 are designated by the same reference numerals.

As shown in FIGS. 2 (a) and 2 (b), the pen-type bar code scanner 10 includes a bottomed cylindrical case 11.
With a conical tip portion 12 that is arranged to be joined to the opening of the case 11, a pair of ribs 13 that are arranged to face each other inside along the length direction of the case 11, and a pair of ribs 13 inside the case 11. Fixedly arranged circuit board 1 and sensor unit 2
And a compression spring 14 arranged between the bottom of the case 11 and the end of the circuit board 1, and a cylindrical shield body 6 that encloses a part of the circuit board 1.

The circuit board 1 has a pair of ribs 13 whose opposite side edges 2 in the longitudinal direction are arranged in the case 11 so as to face each other.
And is fixedly arranged in the case 11, and the arrangement position of the circuit board 1 in the case 11 in the longitudinal direction is set by the compression spring 14 arranged between the end portion and the bottom portion of the case 11.

In such a configuration, the side edge portion 2 of the circuit board 1 is clamped by the pair of ribs 13 in the case 11, and when the circuit board 1 is fixedly arranged in the case 11, the circuit board 1 is fixed.
The cylindrical shield body 6 that encloses the shield body 6 is inserted into the hole 7 of the shield body 6 so that the position where the shield body 6 is arranged with respect to the circuit board 1 is practically the same. Recessed near the formation position of the concave portion 5, that is, the recessed portion 5 of the circuit board 1 is retracted to the inner side in the width direction,
Moreover, the shield body 6 is fixed to the circuit board 1 by soldering the convex portion 4 and the hole 7 at the position where the shield body 6 is inserted.

As described above, according to the first embodiment, when the circuit board 1 is enclosed by the cylindrical shield body 6, as shown in FIG.
As shown in FIG. 5, it is possible to use almost the entire area of the circuit board 1 inside the cylindrical shield body 6 as an effective use area (mounting area), and as shown in FIG. Since it is not necessary to separately provide a portion for fixing the shield body on the circuit board, the effective use area (mounting area) of the circuit board 1 can be widened, and moreover, the effective use area of the circuit board 1 (mounting area). ), It is not necessary to enlarge the circuit board 1 or the case 11.

Further, according to the first embodiment, the contact portions between the conductive regions on both surfaces of the convex portion 4 and the holes 7 of the shield body 6 are soldered, and the cylindrical shield body 6 is fixedly arranged on the circuit board 1. Therefore, the cylindrical shield body 6 can be grounded without providing through holes for electrically connecting the ground pattern regions on both surfaces of the circuit board 1.

Next, FIG. 3 is a structural diagram showing the structure of a second embodiment of the shield structure of the substrate according to the present invention,
(A) is a perspective view showing a state before the auxiliary shield body is wound, and (b) is a perspective view showing a state after the auxiliary shield body is wound, which is also an example when applied to a pen type barcode scanner. Is shown.

In FIGS. 3A and 3B, the same components as those shown in FIG. 1 are designated by the same reference numerals.

As shown in FIGS. 3 (a) and 3 (b), the cylindrical shield body 6 is a flat plate-shaped shield body.
It is formed by winding the wire around the wire and soldering the edge portion thereof, and includes a tongue piece 8 extending from the cylindrical body. The tongue piece 8 is provided so as to come into contact with the ground pattern region 9 of the circuit board 1 when the circuit board 1 is enclosed by the cylindrical shield body 6. The cylindrical auxiliary shield body 15 is
The belt-shaped auxiliary shield body 15A is formed by winding the belt-shaped auxiliary shield body 15A on the outside of the connection area between the end portion of the circuit board 1 and the sensor portion 2 and soldering the edge portion thereof. An auxiliary tongue 16 extends. The auxiliary tongue piece 16 is provided on the surface of the tubular portion of the tubular shield body 6 when the tubular auxiliary shield body 15 is arranged outside the connection region between the end portion of the circuit board 1 and the sensor portion 2. It is provided so as to contact.

When the mounting portion of the low noise amplifier (not shown) on the circuit board 1 is enclosed by the cylindrical shield body 6, first, the flat shield body is wound around the mounting portion of the circuit board 1. During this winding, the three convex portions 4 provided on the opposite side edge portions 3 of the circuit board 1 are fitted into the three holes 7 provided on the shield body 6 side, and then the edge of the wound shield body is inserted. Part, and also, the contact portion between the tongue piece 8 and the ground pattern region 9 of the circuit board 1 is soldered, so that the cylindrical shield body 6 for the circuit board 1
Is fixed and the cylindrical shield body 6 is grounded.

Next, when the connection area between the end portion of the circuit board 1 and the sensor portion 2 is enclosed by the cylindrical auxiliary shield body 15, first, the belt-shaped auxiliary shield body 15A is connected to the end portion of the circuit board 1 and the sensor. Wrap around the connecting portion with the portion 2, and then solder the edge portion of the wound auxiliary shield body 15A,
Further, the contact portion between the auxiliary tongue-shaped piece 16 and the cylindrical shield body 6 is soldered to fix the cylindrical auxiliary shield body 15 and make a ground connection.

As described above, according to the second embodiment, as in the first embodiment, when the circuit board 1 is enclosed by the cylindrical shield body 6, as shown in FIG. It is possible to use almost the entire area of the circuit board 1 inside the circular shield body 6 as an effective use area (mounting area), and it is possible to widen the effective use area (mounting area) of the circuit board 1. Even if the effective use area (mounting area) of the circuit board 1 is expanded, it is not necessary to enlarge the circuit board 1 or the case 11.

Further, according to the second embodiment, since the ground pattern region 9 of the circuit board 1 and the tongue-shaped piece 8 provided on the cylindrical shield body 6 are soldered, both surfaces of the circuit board 1 are soldered. Even if a through hole for electrically connecting the ground pattern area is not provided, the cylindrical shield body 6 can be easily grounded.

In each of the above-mentioned embodiments, the case where the shield structure of the substrate is applied to the circuit substrate on which the low noise amplifier of the pen-type bar code scanner 10 is mounted has been described. The shield structure is not limited to the circuit board on which the low noise amplifier of the pen type bar code scanner 10 is mounted, and the pen type bar code scanner 1
In addition to 0, if the circuit board is housed in the case and at least a part of the circuit board is shielded, it is obvious that it can be similarly applied to other devices.

Further, in each of the above-mentioned embodiments, an example in which three convex portions are provided on a part of the opposite side edge portions of the circuit board and three cylindrical holes are similarly provided on the cylindrical shield body, respectively. However, the number of protrusions and holes in the shield structure of the substrate of the present invention is not limited to three, and may be one or more, and any number may be provided.
You may make it provide one or more convex parts in a part of one side edge part of a circuit board, and may provide one or more holes similarly in a cylindrical shield body, respectively.

[0043]

As described above, according to the present invention, when at least a part of the circuit board is enclosed by the cylindrical shield body, at least one convex portion provided on the side edge portion of the circuit board is provided. Since it is fitted and fixed in the hole provided on the side surface of the shield body, it is not necessary to separately provide a portion for fixing the shield body on the circuit board unlike the known shield structure of this type of substrate, There is an effect that the effective utilization area (mounting area) of the circuit board can be widened without enlarging the case for accommodating the board or the circuit board.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a shield structure of a substrate according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a schematic configuration of a pen-type barcode scanner to which the circuit board shown in FIG. 1 is attached and arranged.

FIG. 3 is a configuration diagram showing a configuration of another embodiment of the shield structure of the substrate according to the present invention.

FIG. 4 is a cross-sectional view showing a schematic configuration of a known pen type barcode scanner.

5 is an exploded perspective view showing an example of a shielded circuit board used in the barcode scanner shown in FIG. 4. FIG.

[Explanation of symbols]

 1 Circuit Board 2 Sensor Part 3 Side Edge Part 4 Convex Part 5 Concave Part 6 Cylindrical Shield Body 7 Hole 8 Tongue Piece 9 Ground Pattern Area 10 Pen Type Bar Code Scanner 11 Case 12 Tip Part 13 Pair of Ribs 14 Compression Spring 15 Cylindrical auxiliary shield 15A Strip auxiliary shield 16 Auxiliary tongue

Claims (5)

[Claims] 1. A circuit board in which at least one side edge of the opposing longitudinal side edges is provided with one or more recesses and protrusions, respectively, and the circuit board extends along the opposing longitudinal side edges. And a cylindrical shield body that encloses the circuit board, wherein the shield body is provided with a hole to be fitted into a convex portion of the circuit board. 2. A conductive region is formed on both surfaces of the convex portion, the circuit board is enclosed by the tubular shield body, and when the hole of the shield body is fitted into the convex portion of the circuit board, The shield structure for a board according to claim 1, wherein the fitting portion is soldered to fix the shield body to the circuit board. 3. When the circuit board is enclosed by the tubular shield body, a flat shield body is wound around the circuit board, and overlapping edge portions of the flat shield body are soldered. The cylindrical shield body that encloses the circuit board is formed.
The shield structure of the substrate according to. 4. A tongue-shaped piece is provided on a part of the cylindrical shield body, and when the circuit board is enclosed by the cylindrical shield body, the tongue-shaped piece is provided in a ground pattern region of the circuit board. The shield structure for a substrate according to claim 1, wherein the shield structure is soldered. 5. The circuit board is fixedly arranged in the case of a bar code scanner, and an amplifier for amplifying a bar code read signal is mounted on the circuit board. 4. The shield structure of the substrate according to 4.