JP3100059U - High frequency unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small high-frequency unit having good electric performance.
A high-frequency unit according to the present invention has a box-shaped frame body, a circuit board mounted in the frame body and provided with a wiring pattern on at least one surface side, and mounted on the wiring pattern. The frame 1 has a mounting hole 1b to be screwed to the external device 8 and the wiring pattern 6 has a routing pattern 6a, and the wiring pattern 6a Since it is arranged so as not to be opposed to the side of the screw 11 which is screwed into the mounting hole 1b and protrudes into the frame body 1, the side of the screw 11 is disposed. Since the distance from the screw 11 is increased, the change in the electrical characteristics is extremely small, and a good electrical performance is obtained.
[Selection] Fig. 2

Description

The present invention relates to a high-frequency unit suitable for use in electronic equipment such as a TV tuner.

FIG. 6 shows an exploded perspective view of a conventional high-frequency unit and shows an attached state to an external device, and FIG. 7 shows a conventional high-frequency unit and shows an attached state of an external device. FIG. 8 is a cross-sectional view of a main part of the conventional high-frequency unit, showing a state where the main part is attached to an external device.

Next, a configuration of a conventional high-frequency unit will be described with reference to FIGS. 6 to 8. A box-shaped frame body 51 made of a metal plate is provided on a plurality of mounting legs 51 a projecting downward and a front wall 51 b. It has a cut-and-raised portion 51c and a mounting hole 51d provided at the center of the cut-and-raised portion 51c.

  The high-frequency unit having such a configuration is housed in an external device (set device) 58, the mounting legs 51a and the terminals are soldered and attached to a mother board 59 described later, and provided on a chassis 60 of the external device 58. The screws 61 inserted into the holes 60a are screwed into the mounting holes 51d so that the frame body 51 is supported by the chassis 60. (See, for example, Reference 1)

{Circle around (5)} As shown in FIGS. 7 and 8, a cover 52 is attached to the frame body 51 of such a high-frequency unit so as to close the open portion, thereby forming a housing 53.

Further, as shown in FIGS. 7 and 8, a circuit board 55 made of an insulating substrate is disposed in the housing 53, and a wiring pattern 56a disposed along the side is disposed on the circuit board 55. A wiring pattern 56 is provided, and various electronic components 57 are mounted on the wiring pattern 56 to form a desired electric circuit.

Such a circuit board 55 is housed in a housing 54 and attached to the frame 51 by soldering or the like, and terminals (not shown) attached to the circuit board 55 are connected to the frame 51 (not shown). Projecting downward through

The high-frequency unit having such a configuration is housed in an external device (set device) 58, and is attached to the mother board 59 by soldering the mounting legs 51a and terminals, and is provided on the chassis 60 of the external device 58. The screws 61 inserted into the holes 60a are screwed into the mounting holes 51d, and the frame 51 is supported by the chassis 60.

At this time, the screw 61 screwed into the mounting hole 51d protrudes into the frame 51, and the side of the screw 61 is opposed to the wiring pattern 56a in a state of being close to it.
When the side of the screw 61 approaches the routing pattern 56a, the electrical characteristics of the high-frequency unit change and the electrical performance deteriorates.

JP 2003-123913 A

In the conventional high-frequency unit, when the screw 61 is screwed into the mounting hole 51d of the frame 51, the screw 61 protrudes into the frame 51, and a side portion of the screw 61 comes close to the drawing pattern 56a. Therefore, there is a problem that the electrical characteristics of the high-frequency unit change and the electrical performance deteriorates.

Therefore, an object of the present invention is to provide a small high-frequency unit having good electric performance.

As a first means for solving the above problems, a box-shaped frame, a circuit board attached to the frame and provided with a wiring pattern on at least one surface side, and mounted on the wiring pattern An electronic component, the frame body has a mounting hole screwed to an external device, the wiring pattern has a wiring pattern, and the wiring pattern is screwed into the mounting hole. In this configuration, the screw is protruded into the frame so as not to face the side of the screw so as to avoid the side of the screw.

As a second solution, a notch is provided on the circuit board at a position facing the screw protruding into the frame.
As a third solution, the screw is located in the notch.

As a fourth solution, the frame has a projection that projects into the frame from an outer peripheral portion of the mounting hole and into which the screw is screwed, and the projection is located in the notch. The configuration was made so that

The high-frequency unit of the present invention includes a box-shaped frame, a circuit board mounted in the frame, and provided with a wiring pattern on at least one surface side, and an electronic component mounted on the wiring pattern. Has a mounting hole that is screwed to an external device, and the wiring pattern has a wiring pattern, and the wiring pattern is provided on the side of the screw that is screwed into the mounting hole and protrudes into the frame. Since it is arranged so as not to face the side of the screw so as to be in a non-opposed state, the distance between the routing pattern and the screw becomes large, the change in electrical characteristics is extremely small, and the electrical performance Good ones are obtained.

In addition, the circuit board is provided with a notch at a position facing the screw protruding into the frame body, so that the position of the screw protruding into the frame body can be closer to the circuit board side. Can be downsized vertically.

In addition, since the screw is located in the notch, the screwing position of the screw can be set to the position of the circuit board. Therefore, the size of the frame can be further reduced in the vertical direction, and a small high-frequency unit can be provided. .

In addition, the frame has a protrusion that projects into the frame from the outer peripheral portion of the mounting hole and into which the screw is screwed, and the protrusion is located within the notch, so that the screwing strength of the screw can be increased. In addition, a small high-frequency unit can be provided.

Referring to the drawings of the high frequency unit of the present invention, FIG. 1 relates to a first embodiment of the high frequency unit of the present invention, and is a sectional view of an essential part showing a state of attachment to an external device, and FIG. FIG.

FIG. 3 is a sectional view of a main part of a high-frequency unit according to a second embodiment of the present invention, showing a state of attachment to an external device. FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. FIG. 13 is a cross-sectional view of a principal part showing a state of attachment to an external device according to a third embodiment of the high-frequency unit.

Next, the configuration of the first embodiment of the high-frequency unit of the present invention will be described with reference to FIGS. 1 and 2. The box-shaped frame 1 made of a metal plate has a rectangular shape with its top and bottom open. It has a plurality of mounting legs 1a protruding downward, a mounting hole 1b, and a protruding portion 1c protruding into the frame 1 from an outer peripheral portion of the mounting hole 1b.

An upper cover 2 is attached to the upper part of the frame 1 so as to cover the opening, and a lower cover 3 is attached to the lower part of the frame 1 so as to cover the opening. It is configured.

A circuit board 5 made of an insulating substrate is provided with a wiring pattern 6 having a wiring pattern 6a arranged along the side, and various electronic components 7 are mounted on the wiring pattern 6, A desired electric circuit is configured.
Further, a part of the routing pattern 6a disposed along the side of the circuit board 5 is formed in a U shape as shown in FIG. Have been.

Such a circuit board 5 is housed in the housing 4 and attached to the frame 1 by soldering or the like, and terminals (not shown) attached to the circuit board 5 are connected to the lower cover 3 (not shown). Projecting downward through

The high-frequency unit having such a configuration is housed in an external device (set device) 8, and is mounted on a chassis 10 of the external device 8 while the mounting legs 1 a and terminals are soldered to the mother board 9. The screws 11 inserted into the holes 10a are screwed into the mounting holes 1b and the protrusions 1c, and the frame 1 is supported by the chassis 10.

At this time, the screw 11 screwed into the mounting hole 1b protrudes into the frame 1, but the drawing pattern 6a is not opposed to the lower part of the screw 11 so as to avoid the lower part (side part) of the screw 11. It is in a state of being arranged.
For this reason, the lower part (side part) of the screw 11 does not approach the routing pattern 6a, the change in the electrical characteristics of the high-frequency unit is extremely small, and the electrical performance is improved.

3 and 4 show a second embodiment of the high-frequency unit according to the present invention. The second embodiment has a screw 11 projecting into the frame 1 and a position facing the projecting portion 1c of the frame 1. , A notch 5a is provided in the circuit board 5.
Other configurations are the same as those of the first embodiment, and therefore, the same components are denoted by the same reference numerals and description thereof will not be repeated.

FIG. 5 shows a third embodiment of the high-frequency unit of the present invention. In this third embodiment, a screw 11 projecting into the frame 1 and a projecting portion 1c of the frame 1 are provided on the circuit board 5. It is located in the notch 5a.
The other configuration is the same as that of the second embodiment, so that the same components are denoted by the same reference numerals and description thereof will be omitted.

FIG. 2 is a sectional view of a main part of the high-frequency unit according to the first embodiment of the present invention, showing a state of attachment to an external device. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 4 is a sectional view of a main part of a second embodiment of the high-frequency unit according to the present invention, showing a state of attachment to an external device. FIG. 4 is a sectional view taken along line 4-4 in FIG. 3. FIG. 9 is a sectional view of a main part of a high-frequency unit according to a third embodiment of the present invention, showing a state of attachment to an external device. FIG. 9 is an exploded perspective view showing a state of attachment to an external device in a conventional high-frequency unit. FIG. 9 is a longitudinal sectional view of a main part showing a state of attachment to an external device in a conventional high-frequency unit. FIG. 9 is a cross-sectional view of a main part of a conventional high-frequency unit, showing a state of attachment to an external device.

Explanation of reference numerals

1: Frame 1a: Mounting leg 1b: Mounting hole 1c: Projection 2: Upper cover 3: Lower cover 4: Housing 5: Circuit board 5a: Notch 6: Wiring pattern 6a: Routing pattern 7: Electronic component 8 : External equipment 9: Mother board 10: Chassis 10a: Hole 11: Screw

Claims (4)

A box-shaped frame, a circuit board mounted in the frame and provided with a wiring pattern on at least one surface side, and an electronic component mounted on the wiring pattern, wherein the frame includes an external device. And the wiring pattern has a wiring pattern, and the wiring pattern is screwed into the mounting hole and protrudes into the frame with respect to a side portion of the screw. A high-frequency unit, wherein the high-frequency unit is disposed so as to be in a non-opposed state, avoiding a side portion of the screw. The high-frequency unit according to claim 1, wherein the circuit board is provided with a notch at a position facing the screw projecting into the frame. The high-frequency unit according to claim 2, wherein the screw is located in the notch. The frame body has a protruding portion that protrudes from the outer peripheral portion of the mounting hole into the frame body and into which the screw is screwed, and the protruding portion is located in the notch portion. The high-frequency unit according to claim 3.

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