JP2004342828A - Shielding cover for high-frequency unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent a mistaken mounting such as a mounting by the mistaking of the direction when a shielding cover is installed to a shielding case for a high-frequency unit. <P>SOLUTION: In the shielding cover 3 to be mounted on the shielding case for the high-frequency unit, a marking displaying the direction of an installation to the shielding case is applied onto the top plate 31 of the shielding cover 3. The marking is inprinted on the top plate 31 at the same time as the punching of the shielding cover 3 by a mold punching and working the shielding cover 3 in this case. Graphics 61 to 65 such as an 0 mark may also be formed as the marked marking in this case, and characters explaining each terminal for the high-frequency unit may also be written. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shield cover of a high-frequency unit such as a tuner built in a television or a video.
[0002]
[Prior art]
In order to reduce unnecessary radiation to the outside of the unit and to reduce characteristic deterioration due to the intrusion of extraneous signals, the high-frequency unit such as a tuner built into a TV or video is assembled into a metal shield case, and the shield is further shielded. A structure using a structure in which a case is surrounded by a metal shield cover is generally used (for example, see Patent Document 1). In this case, a shield cover having a mounting direction is mainly used.
[0003]
In Patent Literature 1, the shield cover has a bent portion that comes into contact with the mounting surface of the board, and a positioning projection inserted into a hole of the board is provided on the bent portion. Therefore, when the shield cover is mounted on the substrate, it is necessary to determine the direction of the shield cover so that the positioning projection can be inserted into the hole formed in the substrate.
[0004]
In the high-frequency unit having the structure shown in FIG. 6, the RF input terminals 101 to 104 and the RF output terminal 105, the power supply terminal 106 and the ground terminals 107 and 110, the input switching control Terminals 108 and 109 are provided. However, FIG. 6 shows side views on the top, bottom, left, and right sides of the plan view (top view).
[0005]
On the other hand, as shown in FIG. 7, the shield cover 200 that covers the entire shield case 100 does not abut on the terminals 101 to 110 when the cover 200 is mounted on the side surface of the case 100. And semicircular concave portions 201 to 210 are formed at corresponding locations. However, FIG. 7 shows side views on the top, bottom, left, and right of the plan view (top view).
[0006]
Therefore, in order to mount the shield cover 200 on the shield case 100, it is necessary to determine the direction of the shield cover 200 so that the corresponding terminal and the concave portion face each other.
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-286585
[Problems to be solved by the invention]
In this case, since the conventional shield cover 200 is not provided with a mark on its top surface so that the mounting direction can be easily determined, for example, as shown in FIGS. If the shape is close to the normal direction and the top surface of the shield cover 200 is also a square or a shape close to a square, the mounting direction of the shield cover 200 cannot be determined from the shape. There was a problem that it was damaged or damaged.
[0009]
The present invention has been made in order to solve such a problem, and an object of the present invention is to perform marking so that the mounting direction can be easily determined by marking the shield cover so that the mounting direction can be easily determined. An object of the present invention is to provide a shield cover for a high-frequency unit in which cost increases due to the above are also eliminated.
[0010]
[Means for Solving the Problems]
The shield cover of the high-frequency unit according to the present invention is a shield cover attached to a shield case of the high-frequency unit, wherein a marking indicating a direction of attachment to the shield case is provided on a surface of the shield cover. And
[0011]
According to the present invention having such features, the mounting direction can be determined only by looking at the shield cover from the top surface, so that the shield cover can be securely mounted on the shield case without making a mistake in the direction.
[0012]
In this case, the marking may be stamped on the surface of the shield cover by a die for punching the shield cover. At this time, a figure, a character, or the like can be used as the shape of the marking.
[0013]
As described above, since the marking is imprinted at the same time when the shield cover is punched out by the mold, there is no need to prepare another process or another member for performing the marking, and the cost does not increase.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows the shape of the high-frequency unit 1 of the present embodiment, and FIG. 2 shows the shape of the shield cover 3 attached to the high-frequency unit shown in FIG. However, both FIG. 1 and FIG. 2 show side views on the top, bottom, left, and right of the plan view (top view).
[0016]
In the high-frequency unit 1 according to the present embodiment, the entire unit including a substrate (not shown) and electronic components mounted on the substrate is incorporated in a shield case 10, and the shield case 10 has a substantially square shape when viewed from above. Is formed. Further, four RF input terminals 11 to 14 are formed on the left side surface 10a of the shield case 10 having such a shape, and one RF output terminal 15 is formed on the right side surface 10c. On the lower side surface 10b, five terminals such as a power terminal 16, ground terminals 17, 20 and input switching control terminals 18, 19 are formed so as to protrude.
[0017]
That is, the high-frequency unit 1 of the present embodiment is a high-frequency unit having four RF input terminals 11 to 14 and one RF output terminal 15, and the four RF input terminals are controlled by control inputs from the input switching control terminals 18 and 19. An input switching function of selecting one of the input terminals 11 to 14 and outputting the selected one to the RF output terminal 15 is provided.
[0018]
As shown in FIG. 3, the shield cover 3 that covers the high-frequency unit 1 is formed by punching a single metal plate using a metal mold, and the top plate 31 has the shape of the shield case 10. It is formed in a substantially square shape so as to fit. Each side plate 32 to 35 is formed to bend and extend downward from each side edge of the top plate 31.
[0019]
As shown in FIG. 2, each of the side plates 32 to 35 is formed such that its lower end is bent inwardly along the longitudinal direction so as to form a U-shape. Is a locking portion when the device is mounted on the shield case 10.
[0020]
That is, the distance L31 between the opposing locking portions (shape portions) 32a and 34a of the shield cover 3 and the distance L32 between the opposing locking portions 33a and 35a are determined by the distance between the opposing portions of the shield case 10. Are formed to be slightly shorter (narrower) than the distance L11 between the side surfaces 10a and 10c and the distance L12 between the opposing side surfaces 10b and 10d (that is, L31 <L11, L32 <L12). .
[0021]
Thus, when the shield cover 3 is mounted on the shield case 10 from above the shield case 10, each of the locking portions 32 a to 35 a causes each of the side surfaces 10 a to 35 a of the shield case 10 by the elastic force of the shield cover 3 itself, which is a metal plate. It is fitted to the shield case 10 in a state where it is expanded while being in contact with 10d. As a result, the locking portions 32a to 35a are pressed against the side surfaces 10a to 10d of the shield case 10 by the elastic restoring force of the shield cover 3 that is pushed out, and the shield cover 3 is prevented from coming off. That is, the shield cover 3 is securely attached to the shield case 10.
[0022]
In such a configuration, when the shield cover 3 is attached to the side walls 32 to 35 of the shield cover 3 so as to cover the shield case 10, the terminals do not abut on the terminals 11 to 20 protruding from the shield case 10. In addition, semicircular concave portions 41 to 50 are formed at opposing locations.
[0023]
As described above, in the high-frequency unit of the present embodiment, the shield cover is not provided due to the arrangement of the RF input terminals 11 to 14, the RF output terminal 15, the power supply terminal 16, the ground terminals 17, 20 and the input switching control terminals 18, 19 of the unit. Since the positions of the concave portions 41 to 50 formed in the side walls 32 to 35 of the shield cover 3 are also different, the shield cover 3 has a direction when it is mounted. It is difficult to determine the direction.
[0024]
Therefore, in the present embodiment, as shown in FIG. 4, the top plate 31 of the shield cover 3 is provided with, for example, a “O” mark in accordance with the positions of the RF input terminals 11 to 14 and the RF output terminal 15 of the high-frequency unit. Marking is performed by engraving the figures 61 to 65. However, the figure is not limited to such white circles, but may be various shapes such as black circles, crosses (x), triangles, squares, and arrows.
[0025]
Alternatively, as shown in FIG. 5, the marking may be performed by engraving the characters 71 to 75 of the terminal description in accordance with the positions of the RF input terminals 11 to 14 and the RF output terminal 15 of the high-frequency unit. However, the characters do not necessarily need to be characters that describe terminals.
[0026]
The marking may be formed by simultaneously stamping the shield cover 3 with a mold (not shown) when the shield cover 3 is punched by the mold. Accordingly, there is no need to prepare another process or another member for performing marking, and there is no increase in cost.
[0027]
【The invention's effect】
According to the shield cover of the high-frequency unit according to the present invention, by marking the top surface of the shield cover to indicate the mounting direction, the positions of the RF input terminal and the RF output terminal of the high-frequency unit coincide with the marking positions on the shield cover. Therefore, the mounting direction of the shield cover can be instantaneously determined, and an incorrect mounting direction can be reliably prevented. In addition, since the marking is stamped at the same time when the shield cover is punched out by the mold, it is not necessary to prepare another process or another member for performing the marking, and the cost does not increase.
[Brief description of the drawings]
FIG. 1 shows the shape of a high-frequency unit according to the present invention, and shows respective side views on the top, bottom, left and right of the plan view (top view).
FIG. 2 shows the shape of a shield cover according to the present invention, and shows respective side views on the top, bottom, left and right of the plan view (top view).
FIG. 3 is a plan view showing a state where a shield cover is punched out of one metal plate by a mold.
FIG. 4 is an explanatory diagram showing an example of markings applied to a shield cover according to the present invention, and shows respective side views in the upper, lower, left and right directions, centering on a plan view (top view).
FIG. 5 is an explanatory view showing another example of the marking provided on the shield cover according to the present invention, and shows respective side views on the top, bottom, left and right of the plan view (top view).
FIG. 6 shows the shape of a conventional high-frequency unit, and shows respective side views on the top, bottom, left, and right sides of a plan view (top view).
FIG. 7 shows the shape of a conventional shield cover, and shows respective side views on the top, bottom, left and right of a plan view (top view).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High frequency unit 3 Shield cover 10 Shield case 11-14 RF input terminal 15 RF output terminal 16 Power supply terminal 17, 20 Grounding terminal 18, 19 Input switching control terminal 31 Top plate 32-35 Side plate 41-50 Recess 61-65 ○ mark (marking)
71-75 Explanation text (marking)

Claims (4)

A shield cover attached to a shield case of a high-frequency unit, wherein a marking indicating a direction of attachment to the shield case is provided on a surface of the shield cover. 2. The shield cover of the high-frequency unit according to claim 1, wherein the marking is formed on a surface of the shield cover by a die for punching the shield cover. 3. The shield cover according to claim 2, wherein the marking is a figure engraved by the mold. The shield cover of the high frequency unit according to claim 2, wherein the marking is a character engraved by the mold.

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