JP2003188572A - Electronic tuner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the mixing of shield covers for covering the top and bottom faces of a chassis case, and to improve the workability in assembly to reduce a cost. <P>SOLUTION: A shield cover 3 for covering the top and bottom faces of a chassis case 2 comprises a top face shield cover section 31 for covering the top face of the chassis case 2, a bottom face shield cover section 33 for covering the bottom face of the chassis case 2, and a side face shield cover section 32 for connecting the top face shield cover section 31 and the bottom face shield cover section 33 into one body. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic tuner such as a television receiver.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, an electronic tuner 10 such as a television receiver has its interior partitioned by a partition plate 14 and a chassis housing 11 in which a circuit board (not shown) is incorporated. And an upper surface shield lid 12 that covers the upper surface of the chassis housing 11 and a locking piece 121 formed on the peripheral edge portion, and a lower surface shield that covers the lower surface of the chassis housing 11 and a locking piece 131 formed on the peripheral edge portion. Lid 1
3 and the upper and lower edge portions of each side surface of the chassis housing 11 and the partition plate 14 are provided with protrusions 15 at appropriate intervals.
Further, the upper surface shield lid 12 and the lower surface shield lid 13 are formed with rectangular hole-shaped slits 16 corresponding to the above-mentioned convex pieces 15.

When assembling the electronic tuner 10 thus constructed, the upper surface of the chassis housing 11 is covered with the top shield lid 12, and the outer peripheral surface of the chassis housing 11 is sandwiched by the locking pieces 121. At the same time, the projecting pieces 15 of the chassis housing 11 and the partition plate 14 are inserted into the slits 16 of the top shield plate 12, and the projecting pieces 15 are bent to fix the top shield lid 12 to the chassis housing 11.
Similarly, a lower surface shield lid 13 is provided on the lower surface of the chassis housing 11.
The locking piece 131 along the outer peripheral surface of the chassis housing 11 so as to be sandwiched between the chassis housing 11 and the projecting piece 1 of the chassis housing 11.
5 is inserted into the slit 16 of the lower shield plate 13, the protruding piece 15 is bent, and the chassis shield 11 is attached to the lower shield lid 1.
3 is fixed (see, for example, Japanese Patent Application Laid-Open No. 8-265105, filed by the applicant).

[0004]

By the way, when assembling the electronic tuner 10 described above, the circuit board is incorporated into the chassis housing 11 and the tuner is adjusted. Since the lower surface shield lid 13 is sequentially covered and fixed, two steps, that is, the step of fixing the upper surface shield lid 12 and the step of fixing the lower surface shield lid 13 are required, and there is a problem that the takt time increases and the cost increases. It was Also, the top shield lid 12 and the bottom shield lid 13 having similar shapes must be prepared, and the top shield lid 1 is erroneously prepared.
There is a possibility that the lower surface shield lid 13 may be mixed in the fixing step of No. 2 and vice versa, and the upper surface shield lid 12 may be mixed in the fixing step of the lower surface shield lid 13, which is confusing in storage and management. Further, in order to securely fix the upper surface shield lid 12 and the lower surface shield lid 13 to the chassis housing 11, the convex pieces 15 are formed on the chassis housing 11 and the partition plate 14, and the upper surface shield lid 12 and the lower surface shield lid are provided. 13 is formed with a square hole-shaped slit 16,
Although the convex piece 15 is bent after the convex piece 15 is inserted into the slit 16, the upper shield lid 12 and the lower shield lid 13 may be displaced along the longitudinal direction of the slit 16, which may cause a misalignment with the chassis housing 11. There is a drawback that the accuracy of the mounting position of each shield lid 12 and 13 decreases.

The present invention has been made in view of the above problems, and reliably prevents the shield lid from covering the upper surface and the lower surface of the chassis housing, and improves workability during assembly to reduce costs. The present invention provides an electronic tuner that can reduce

[0006]

According to the present invention, there is provided an electronic device including a chassis housing in which a circuit board is incorporated, the interior of which is partitioned by a partition plate, and a shield lid which covers an upper surface and a lower surface of the chassis housing. The tuner is a tuner, and the shield lid includes an upper surface shield lid portion that covers an upper surface of the chassis housing, a lower surface shield lid portion that covers a lower surface of the chassis housing, and the upper surface shield lid portion and the lower surface shield lid portion that are integrally connected. It is characterized in that it is formed from a side shield cover part.

According to the present invention, the shield lid integrally includes the upper surface shield lid portion that covers the upper surface of the chassis housing, the lower surface shield lid portion that covers the lower surface of the chassis housing, and the upper surface shield lid portion and the lower surface shield lid portion. It is possible to fix the shield lid to the chassis housing in one step because it is formed from the side shield lid part that is continuously provided on the top surface of the chassis, while reducing the working time and manufacturing cost. Mixing of the shield lid and the bottom shield lid is eliminated, which is advantageous for storage and management.

In the present invention, the claw pieces are vertically provided on the side surface of the chassis housing and the partition plate, and the claw pieces can be fitted into the upper surface shield lid portion and the lower surface shield lid portion of the shield lid, respectively. When the slit is formed,
By covering the upper surface and the lower surface of the chassis housing with the upper surface shield lid portion and the lower surface shield lid portion of the shield lid, respectively, the slits of the upper surface shield lid portion and the lower surface shield lid portion are provided on the nail pieces of the chassis housing and the partition plate. Each slit can be inserted.

In particular, while the claw pieces are vertically provided on the side surface of the chassis housing which is in contact with the side surface shield lid portion of the shield lid, and the claw pieces are vertically provided on the end edge portion of the partition plate on the side intersecting the side surface, If slits are formed along the upper shield cover and the lower shield cover along with the side shield cover, respectively, when the shield cover is covered, these tabs of the chassis case and the partition plate can be cut. It is preferable since the corresponding slits can be easily fitted and inserted.

In the present invention, the chassis housing is covered with the shield lid, and the claw pieces fitted into the slits of the upper surface shield lid portion and the lower surface shield lid portion of the shield lid are bent to form the chassis housing. When the shield lid is fixed, the shield lid can be securely fixed to the chassis housing without being removed, and the shielding effect of the chassis housing can be improved.

In the present invention, a T-shaped claw piece is formed by a claw piece that is vertically provided on a side surface of the chassis housing and a claw piece that is vertically provided at an edge of a partition plate that intersects with the chassis housing. And a cross-shaped claw piece is formed by the claw pieces vertically provided at the intersections of the partition plates, and a T-shaped claw piece and a cross-shaped claw piece are formed on the upper shield lid portion or the lower shield lid portion of the shield lid. If the T-shaped slit and the cross-shaped slit into which the piece can be inserted are formed, when the chassis housing is covered with the shield lid, the T-shaped claw and the cross-shaped claw are respectively provided with the T-shaped slit and the cross. -Shaped slit is inserted, so there is no displacement of the shield lid in the front-back and left-right directions,
It is possible to ensure the mounting position accuracy of the shield lid with respect to the chassis housing.

In the present invention, if the T-shaped slits and the cross-shaped slits are relatively smaller in cross-sectional shape than the corresponding T-shaped claw pieces and cross-shaped claw pieces, the chassis housing has a shield lid. The shield lid can be securely fixed to the chassis housing by pressing the T-shaped slit and the cross-shaped slit into the T-shaped nail piece and the cross-shaped nail piece, respectively. It will be good.

In the present invention, when the cover ring is provided around the slit, the periphery of the slit can be reinforced, and distortion can be prevented from occurring in the slit when the slit is fitted into the claw piece. .

In the present invention, when the side surface shield lid portion is formed with a spring piece capable of contacting the side surface of the chassis housing, when the shield lid is attached to the chassis housing,
Since the spring piece comes into contact with one side surface of the chassis housing corresponding to the side surface shield lid portion, the shield effect on the chassis housing can be improved.

In the present invention, when the plurality of spring pieces are formed by being alternately shifted by 180 degrees, it is possible to secure contact points of the plurality of spring pieces with respect to the side surface of the chassis housing, and thus the shield is provided. The effect can be further improved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the electronic tuner 1 of the present invention.

The electronic tuner 1 includes a chassis housing 2
And a shield cover 3 that covers the upper surface and the lower surface of the chassis housing 2. The interior of the chassis housing 2 is partitioned by two partition plates 4 and 4 which are orthogonal to each other, and a circuit board (not shown). And an input / output terminal 5 is arranged on one side surface.

A plurality of substantially inverted trapezoidal claw pieces 21 are vertically provided at appropriate intervals on the upper and lower edges of the chassis housing 2. Of these claw pieces 21, a proper number of selected claw pieces 21 are vertically provided so as to correspond to positions that intersect the partition plate 4 when the partition plate 4 is arranged.

In addition, the upper edge of each of the upper edges of the partition plate 4 and the upper edge of a substantially intermediate portion which intersects with another partition plate 4 are
Claw pieces 41 each having a substantially inverted trapezoidal shape are vertically provided. In this case, at the approximately middle position where the partition plates 4 and 4 intersect, the lower half part of one partition plate 4 and the claw piece 41 of the other partition plate 4 are formed.
A cut is formed in each of the upper half part including
By meshing these cuts, the pair of partition plates 4 and 4 are connected orthogonally.

Therefore, the partition plates 4, 4 are attached to the chassis housing 2.
By disposing, the T-shaped claw piece 6 is formed by the claw piece 21 of the chassis housing 2 and the claw piece 41 at the edge of each partition plate 4 when viewed from above (see FIG. 3), In addition, the claw pieces 41, 41 at the intersection of the connected partition plates 4, 4
The cross-shaped claw piece 7 is formed as seen from above (see FIG. 4).

On the other hand, as shown in a development view in FIG. 2, the shield lid 3 has a side surface shield lid portion 32 and a lower surface shield lid portion 33 at the lower end edge of the upper surface shield lid portion 31 in order via folds a and b. The upper surface shield lid portion 31 and the lower surface shield lid portion 33, which are formed in a continuous manner, have a fold line c at each peripheral edge portion except the fold lines a and b with the side surface shield lid portion 32.
The locking pieces 34 are respectively formed through the. The side shield cover portion 32 of the shield cover 3 is formed to have a size substantially matching the other side surface of the chassis housing 2.
The upper surface shield lid portion 31 and the lower surface shield lid portion 33 are
It is formed in a size that covers the upper surface and the lower surface of the chassis housing 2.

Further, the upper surface shield lid portion 3 of the shield lid 3
1 and the lower shield cover 33, the substantially inverted trapezoidal claw piece 21 formed in the chassis housing 2 described above, and the partition plate 4
A slit is formed at a position corresponding to the substantially inverted trapezoidal claw piece 41 formed in the above. Specifically, along the fold line a of the top shield lid portion 31 with the side shield lid portion 32, the upper edge of the other side surface of the chassis housing 2 facing the one side surface on which the input / output terminal 5 is disposed is provided. Square-hole-shaped slits corresponding to the T-shaped claw piece 6 formed of the claw piece 21 vertically provided, the claw piece 21 of the chassis housing 2 and the claw piece 41 vertically provided at the end edge of the partition plate 4. 3a and a T-shaped slit 3b are formed (see FIGS. 2 and 3). Further, along the fold line c of the upper shield lid portion 31 with the left locking piece 34, the claw piece 21 and the edge portion of the partition plate 4 which are vertically provided on the upper edge of the left side surface of the chassis housing 2. A T-shaped slit 3b is formed corresponding to the T-shaped claw piece 6 composed of a claw piece 41 that is vertically installed on the upper surface shield lid portion 31, and at the fold c of the upper shield lid portion 31 with the front locking piece 34. Along the T-shaped claw piece 6 that is composed of the claw piece 21 that is vertically provided on the upper edge of one side surface of the chassis housing 2 and the claw piece 41 that is vertically provided on the edge of the partition plate 4. The character-shaped slit 3b is formed. Further, the cross-shaped claw piece 7 composed of claw pieces 41, 41 provided substantially vertically in the middle of the partition plates 4, 4 at the substantially central portion of the top shield lid 31.
The cross-shaped slit 3c is formed corresponding to (FIG. 2).
And FIG. 4).

Similarly, along the fold line “b” of the bottom shield lid portion 33 with the side shield lid portion 32, the chassis housing 2
A rectangular hole-shaped slit 3a is formed corresponding to the claw piece 21 vertically provided on the lower edge of the other side surface.

Peripheries of the square hole-shaped slits 31a, the T-shaped slits 31b and the cross-shaped slits 31c formed in the upper surface shield lid portion 31, and the lower surface shield lid portion 33.
A cover ring 8 is formed around each of the rectangular hole-shaped slits 33a formed in the above (see FIGS. 2 to 4). Thus, by forming the bulging cover ring 8 around each slit 31a, 31b, 31c, 33a, each slit 31a, 31b, 31c, 33a can be reinforced. Therefore, as will be described later, each slit 31
a, 31b, 31c, 33a, a claw piece 21, a claw piece 21, 4
When inserting the T-shaped claw piece 6 made of 1 and the cross-shaped claw piece 7 made of the claw pieces 41, 41, each slit 31a, 31b, 3
It is possible to prevent the peripheral edges of 1c and 33a from being distorted.

Further, the side shield lid portion 32 has a plurality of vertical cuts 32a formed at set intervals.
A plurality of spring pieces 321 are formed by a plurality of horizontal cuts 32b formed so as to alternately connect the upper end edge and the lower end edge of a pair of vertical cuts 32a adjacent to each other. The tip of each spring piece 321 is projected inward so as to contact the other side surface of the chassis housing 2 (see FIGS. 2 and 5).

Next, a procedure for assembling the electronic tuner 1 thus constructed will be described.

First, the partition plates 4 and 4 connected orthogonally to the chassis 2 are arranged, a circuit board (not shown) is installed, and then the tuner is adjusted.

On the other hand, according to the development view shown in FIG. 2, the metal plate is punched out to form the shield lid 3. That is, a metal plate is punched out along the outer shape of the shield lid 3, and a square hole-shaped slit 31a is formed at a predetermined position of the top shield lid portion 31,
A T-shaped slit 31b and a cross-shaped slit 31c are formed, and a rectangular hole-shaped slit 33a is formed at a predetermined position of the lower surface shield lid portion 33. Together, the slits 31a, 31b, 31c, 33a are provided at the peripheral edge portions. Cover ring 8
To form. Further, a vertical cut 32a and a horizontal cut 32b are formed in the side shield lid portion 32, and the tip end of each spring piece 321 composed of these vertical cut 32a and horizontal cut 32b is directed inward. Deform so that it projects toward you. Next, after each locking piece 34 is valley-folded on the upper surface shield lid portion 31 along the fold c, and each locking piece 34 is valley-folded on the lower surface shield lid portion 33 along the fold c, The side surface shield lid portion 32 is valley-folded along the fold line b with respect to the lower surface shield lid portion 33, and the upper surface shield lid portion 31 is further valley-folded along the fold line a with respect to the side surface shield lid portion 32. The shield lid 3 (see FIG. 1) thus formed is carried into the fixing step.

Then, in the step of fixing the shield lid 3, the shield lid 3 is attached to the chassis housing 2 whose tuner has been adjusted. That is, the rectangular hole-shaped slit 33a formed in the lower surface shield lid portion 33 of the shield lid 3
A substantially inverted trapezoidal claw piece 21 formed on the lower end edge of the other side surface of the chassis housing 2 is fitted into the chassis housing 2 at the same time.
Is dropped and the outer peripheral surface thereof is sandwiched by the locking pieces 34. At this time, the rectangular hole-shaped slits 3 of the lower surface shield lid portion 33
3a is formed along a fold line "b" with the side surface shield lid portion 32, so that the other side surface of the chassis housing 2 is dropped along the side surface shield lid portion 32 so that the claw piece 21 has a square hole shape. It can be easily fitted into the slit 33a. Moreover, at the lower edge of one side surface of the chassis housing 2,
Since the claw piece 21 is not formed, the mounting position is not mistaken.

When the chassis housing 2 is attached to the lower surface shield lid 33 of the shield lid 3, the side surface shield lid portion 32 is attached to the lower surface shield lid portion 33 so as to contact the other side surface of the chassis housing 2. The top shield lid 31 is folded along the fold b along the fold a with respect to the side shield lid 32, and the top shield lid 31 is covered so as to cover the top surface of the chassis 2.

At this time, since each spring piece 321 formed on the side shield lid portion 32 is projected inward, it is elastically deformed to the outer surface of the other side surface of the chassis housing 2 to surely come into contact therewith. However, the shielding effect of the chassis housing 2 can be improved.

On the other hand, when the upper surface of the chassis housing 2 is covered with the upper surface shield lid portion 31, the square hole-shaped slits 31a formed in the upper surface shield lid portion 31 of the shield lid 3 have their upper ends on the other side surface of the chassis housing 2. The substantially inverted trapezoidal claw piece 21 and the partition plate 4 which are fitted and inserted into the substantially inverted trapezoidal claw piece 21 vertically provided on the edge and have the T-shaped slit 31b vertically suspended at the upper end edge of the chassis housing 2. Is inserted into the T-shaped claw piece 6 formed by intersecting substantially inverted trapezoidal claw pieces 41 vertically provided at the end edge portion of the cross-shaped slit 31c, and the cross-shaped slit 31c is substantially in the middle of the partition plates 4 and 4. Is fitted into a cross-shaped claw piece 7 formed by intersecting substantially inverted trapezoidal claw pieces 41, 41 hung vertically on the upper part, and further, a locking piece 34 of the top shield lid part 31 is a chassis housing. Insert the outer peripheral surface of 2. At this time, by covering the upper surface of the chassis housing 2 with the upper surface shield lid portion 31, the rectangular hole-shaped slits 31a and the T-shaped slits 31b formed along the fold b with the side surface shield lid portion 32 are provided in the chassis housing. It can be easily fitted and inserted into the claw piece 21 and the T-shaped claw piece 6 formed on the other side surface of 2.

After this, the claw pieces 21 and 41 protruding from the square hole-shaped slit 31a, the T-shaped slit 31b and the cross-shaped slit 31c formed in the upper surface shield lid portion 31 of the shield lid 3 are bent and the lower surface is formed. By bending each of the claw pieces 21 protruding from the rectangular hole-shaped slit 31a formed in the shield lid portion 33, the chassis housing 2
It is possible to securely fix the shield lid 3 without removing it.

As a result, by adopting the shield lid 3 in which the upper surface shield lid portion 31 and the lower surface shield lid portion 33 are integrally connected through the side surface shield lid portion 32, the shield lid 3 is formed in one step in the chassis housing. It is possible to fix it to 2, and it is possible to shorten the working time, reduce the manufacturing cost, and eliminate the mixing of the top shield lid and the bottom shield lid.

Further, a claw piece 21 is vertically provided on the chassis housing 2 and a claw piece 41 is vertically provided on the partition plate 4, and the T-shaped claw is formed from the claw piece 21 of the chassis housing 2 and the claw piece 41 of the partition plate 4. In addition to forming the piece 6, the cross-shaped claw piece 7 is formed from the claw pieces 41, 41 of the partition plates 4, 4, and the shield lid 3 is formed corresponding to the T-shaped claw piece 6 and the cross-shaped claw piece 7. T-shaped slit 31
b and the cross-shaped slit 31c are formed, and the T-shaped slit 31b and the cross-shaped slit 31c are fitted and inserted into the T-shaped claw piece 6 and the cross-shaped claw piece 7, respectively. It is possible to prevent the positional displacement of 3 in the front-rear and left-right directions, and to secure the mounting position accuracy of the shield lid 3.

By the way, in the above-mentioned embodiment,
Corresponding to the claw pieces 21 of the chassis housing 2 and the claw pieces 41 of the partition plate 4, a T-shaped claw piece 6 composed of these claw pieces 21, 41 and a cross-shaped claw piece 7 composed of the claw pieces 41, 41 are provided. T-shaped slit 31b and cross-shaped slit 31c that can be inserted
Although the case where the above is formed on the upper surface shield lid portion 31 of the shield lid 3 has been described, as shown in FIGS. 6 and 7, instead of the substantially inverted trapezoidal claw pieces 21 and 41, triangular claw pieces 21 and 41 are used.
To form these claw pieces 21, 41 and claw pieces 41, 4
1 are combined to form a T-shaped claw piece 6 and a cross-shaped claw piece 7, and these T-shaped claw pieces 6 are formed on the shield lid 3.
And a T-shaped slit 3b and a cross-shaped slit 3c having a cross-sectional shape relatively smaller than the cross-sectional shape of the cross-shaped claw piece 7.
May be formed, and the T-shaped slit 3b and the cross-shaped slit 3c of the shield lid 3 may be press-fitted into the T-shaped claw piece 6 and the cross-shaped claw piece 7. In this way, the T-shaped claw piece 6
When the T-shaped slit 3b and the cross-shaped slit 3c having a cross section relatively smaller than the cross-section of the cross-shaped claw piece 7 are formed and press-fitted, the shield lid 3 is plastically deformed, and the claw piece 2 is formed.
Shield lid 3 without the need for bending 1, 41
Can be fixed to the chassis housing 2.

[0038]

As described above, according to the present invention, the workability at the time of assembly can be improved, the cost can be reduced, and the shield lid for covering the upper surface and the lower surface of the chassis housing can be provided. It is possible to reliably prevent the mixture.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of an electronic tuner of the present invention.

FIG. 2 is a development view of a shield lid that constitutes the electronic tuner of FIG.

3 is an enlarged perspective view showing the relationship between the T-shaped claw piece and the T-shaped slit of FIG. 1. FIG.

FIG. 4 is an enlarged perspective view showing the relationship between the cross-shaped claw piece and the cross-shaped slit of FIG.

FIG. 5 is a perspective view showing a spring piece formed on the side shield lid portion of FIG. 1 with a part of the spring piece omitted;

FIG. 6 is an enlarged perspective view showing a modified example of a T-shaped claw piece and a T-shaped slit.

FIG. 7 is an enlarged perspective view showing a modified example of a cross-shaped claw piece and a cross-shaped slit.

FIG. 8 is an exploded perspective view showing a conventional electronic tuner.

[Explanation of symbols]

1 Electronic tuner 2 chassis housing 21 nail pieces 3 shield lid 3a Square hole slit 3b T-shaped slit 3c Cross-shaped slit 31 Top shield cover 32 Side shield cover 33 Bottom shield lid 4 partition boards 41 nail pieces 6 T-shaped claw pieces 7 cross nail 8 cover

Claims (8)

[Claims] 1. An electronic tuner comprising: a chassis housing, the interior of which is partitioned by a partition plate, in which a circuit board is incorporated; and a shield lid that covers an upper surface and a lower surface of the chassis housing. Is formed of an upper surface shield lid portion that covers the upper surface of the chassis housing, a lower surface shield lid portion that covers the lower surface of the chassis housing, and a side surface shield lid portion that integrally connects the upper surface shield lid portion and the lower surface shield lid portion. An electronic tuner characterized in that 2. A claw piece is vertically provided on a side surface of the chassis casing and a partition plate, and a slit into which the claw piece can be fitted is provided on an upper surface shield lid portion and a lower surface shield lid portion of the shield lid. The electronic tuner according to claim 2, wherein the electronic tuner is formed. 3. The chassis housing is covered with a shield lid, and the claw pieces inserted into the slits of the upper surface shield lid portion and the lower surface shield lid portion of the shield lid are bent to bend the chassis housing with the shield lid. The electronic tuner according to claim 2, wherein the electronic tuner is fixed. 4. A T-shaped claw piece is formed by a claw piece that is vertically provided on a side surface of the chassis housing and a claw piece that is vertically provided at an edge portion of a partition plate that intersects with the chassis housing. Cross-shaped claw pieces are formed by the claw pieces vertically provided at the intersections of the partition plates, and a T-shaped claw piece and a cross-shaped claw piece are formed on the upper shield lid part or the lower shield cover part of the shield lid. The electronic tuner according to claim 2 or 3, wherein a T-shaped slit and a cross-shaped slit that can be inserted are formed. 5. The cross-sectional shape of the T-shaped slit and the cross-shaped slit is relatively smaller than the cross-sectional shape of the corresponding T-shaped claw piece and the corresponding cross-shaped claw piece. Electronic tuner. 6. The electronic tuner according to claim 2, further comprising a cover ring around the slit. 7. The electronic tuner according to claim 1, wherein a spring piece capable of contacting a side surface of the chassis is formed on the side shield lid portion. 8. The electronic tuner according to claim 7, wherein a plurality of the spring pieces are formed while being alternately shifted by 180 degrees.