JP2012191009A - Electronic circuit unit and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic circuit unit with a coaxial connector, along with its manufacturing method, capable of coping with varying usages at a low cost, with reliability being easy to be assured.SOLUTION: In a tuner unit 11, an almost rectangular circuit board 2 having a core wire fitting hole 2c is housed and held inside a substantially rectangular parallelepiped-shaped case 1 made of a metal plate, and a coaxial connector 4 is attached to a peripheral edge of a through hole 1b provided to a top plate 1a of the case 1. A plurality of engaged holes 2d which are provided at the circuit board 2 and engaged with the case 1, are arranged in line symmetry relative to a straight line L. A plurality of terminal fitting holes 2e arranged along one side of the circuit board 2 are arranged in line symmetry relative to the straight line L as well. An opening position of the through hole 1b can be selected as required, and the circuit board 2 can be assembled in the case 1 even in a posture inverted inside out. Therefore, by using a similar procedure with components shared with the tuner unit 11, a tuner unit can be manufactured in which the coaxial connector 4 is attached to another place of the top plate 1a and a side plate 1c.

Description

  The present invention relates to an electronic circuit unit such as a tuner unit in which a coaxial connector is attached to a casing made of a metal plate, and a manufacturing method thereof.

  A coaxial connector typified by an F-type connector is attached to a housing of an electronic circuit unit such as a tuner unit that can receive a television broadcast signal. This casing is made of a metal plate, and a bathtub-shaped casing having an opening on the bottom side, a substantially sealed casing having the opening covered with a shield cover, and the like are known. A circuit board is accommodated in the housing, and a high-frequency circuit including a tuner circuit is disposed on the circuit board. The core wire portion led out from the coaxial connector is inserted into the core wire mounting hole of the high-frequency circuit and is electrically and mechanically connected. In addition, this high frequency circuit is electromagnetically shielded by the housing, and when the bottom surface side of the housing is open, a ground layer provided on the back surface side of the motherboard overlaps the opening. This motherboard is, for example, a television board built in a television receiver.

  When this type of electronic circuit unit with a coaxial connector is mounted on a mother board such as a TV board, the coaxial connector 21 of the electronic circuit unit 20 mounted on the left end of the mother board 10 faces leftward as shown in FIG. In many cases, the coaxial connector 31 of the electronic circuit unit 30 mounted on the right end portion of the mother board 10 is protruded rightward. The core wire portions led out from the coaxial connectors 21 and 31 of the electronic circuit units 20 and 30 into the housing are respectively inserted into the core wire mounting holes 22 and 32 provided in the vicinity of one side of the circuit board housed in the housing. It is inserted. Further, the terminal groups constituting the input / output terminal groups 23 and 33 of the electronic circuit units 20 and 30 are connected to corresponding connection lands (not shown) on the mother board 10 side by soldering or the like. In some cases, this type of electronic circuit unit is mounted on the inner side of the peripheral edge of the motherboard 10, and the coaxial connector protrudes perpendicularly to the motherboard 10.

  By the way, depending on the type and manufacturer of an electronic device such as a television receiver with a built-in motherboard 10, the location on the motherboard 10 where the electronic circuit unit (tuner unit) is mounted is selected. The structure of the electronic circuit unit to be used is preferably shared as much as possible regardless of the mounting position and the direction of the coaxial connector. In particular, the circuit board housed in the housing of the electronic circuit unit is equipped with complicated wiring patterns and various electronic components, so multiple types of circuit boards are prepared because the mounting position and the orientation of the coaxial connector are different. It is extremely uneconomical to do.

  Therefore, conventionally, a technique is known in which a circuit board is turned upside down to cope with an increase in the variety of electronic circuit units (for example, see Patent Document 1). To give a specific example using such a conventional technique, if the left electronic circuit unit 20 is mounted on the mother board 10 in a supine posture in FIG. It can be used as a circuit board for the electronic circuit unit 30. At that time, the housing of the electronic circuit unit 20 cannot be used as it is as the housing of the electronic circuit unit 30, but it can be used by changing the mounting leg to the top of the former housing. Become. Moreover, when mounting the housing | casing in which the bottom face side is open on the motherboard 10 in a supine posture, what is necessary is just to cover this opening with a shield cover.

JP 2007-5469 A

  However, the conventional electronic circuit unit with a coaxial connector has not been designed to be easily adapted to various usage forms. For example, in FIG. 13, when the casing of one electronic circuit unit 30 is a diverted part with the other electronic circuit unit 20 facing up, the top plate portion of the former casing is covered by a thin shield cover. Since it is configured, the shielding performance is lowered as compared with the top plate portion of the latter casing. In this case, if the casing of the electronic circuit unit 20 overlaps the ground layer of the mother board 10, a shield cover is not necessary, but a shield cover is required for the casing of the electronic circuit unit 30. As a result, the number of parts increases. Furthermore, when the usage pattern in which the coaxial connector 31 protrudes perpendicularly to the motherboard 10 is adopted, the required mounting strength is ensured if the top plate portion of the housing is constituted by a thin shield cover. Therefore, the coaxial connector 31 is easily detached from the housing.

  The present invention has been made in view of the actual situation of the prior art, and a first object of the present invention is to provide an electronic circuit unit with a coaxial connector that can be inexpensively adapted to various usage forms and easily ensure reliability. It is to provide. A second object of the present invention is to provide a method for manufacturing such an electronic circuit unit.

  In order to achieve the first object, the present invention provides a substantially rectangular parallelepiped housing made of a metal plate and having one surface as an open surface, and a core wire that is housed inside the housing and is near one side. A substantially rectangular circuit board having a mounting hole, and an input / output terminal group that is inserted into a plurality of terminal mounting holes arranged along one side of the circuit board and extends to the outside of the housing; A coaxial connector that is attached to the housing in a posture that penetrates the side plate portion or the top plate portion of the housing and the core wire portion is inserted into the mounting hole for the core wire, and is provided at a plurality of locations on the circuit board. In the electronic circuit unit in which the circuit board is fixed in a positioned state by the housing being locked by the housing, the one side of the circuit board is connected to the midpoint of the other side parallel thereto. The plurality of locked portions are arranged in a line-symmetric positional relationship with a straight line as a symmetry axis. Rutotomoni was the configuration of the plurality of terminal mounting holes are arranged in line symmetrical positional relationship.

  In this way, the circuit board in which the plurality of locked portions locked at predetermined positions of the housing are arranged in a line-symmetrical positional relationship does not cause the locked portions to be locked even if the front and back are reversed around the symmetry axis. Since all can be arranged at the predetermined position of the casing, the circuit board can be stored and held in the casing regardless of whether the circuit board is turned upside down. In addition, since the terminal mounting hole groups arranged on one side edge of the circuit board are also arranged in a line-symmetrical positional relationship, even if the circuit board is turned upside down around the axis of symmetry, the position of the terminal mounting hole group is As a whole, the input / output terminal group that can be integrated as a molded terminal or the like can be inserted from either the front or back side of the circuit board. When one main surface of the circuit board is opposed to the top plate portion of the casing, a coaxial connector is attached to the side plate portion of the casing in the vicinity of the core wire mounting hole, and this is parallel to the circuit board. A first usage pattern that projects laterally, and a second connector in which a coaxial connector is attached to the top plate portion of the housing in the vicinity of directly above the mounting hole for the core wire, and projects upward upward perpendicular to the circuit board. The usage form can be selected. In addition, when the circuit board is turned upside down around the axis of symmetry, the core wire mounting holes are arranged at different positions with respect to the casing, so the other main surface of the circuit board faces the top plate of the casing. Sometimes, a third usage pattern in which the coaxial connector is attached to the side plate portion of the casing in the vicinity of the mounting hole for the core wire and protrudes sideways, and the top of the casing is positioned just above the mounting hole for the core wire. A fourth usage pattern in which the coaxial connector is attached to the plate portion and protrudes upward can be selected. Accordingly, the first to fourth usage modes having different mounting positions and orientations of the coaxial connector can be appropriately selected while sharing the circuit board and the input / output terminal group. The top plate of the housing that covers the board does not become a thin shield cover.

  In order to achieve the above second object, the present invention provides a substantially rectangular parallelepiped housing made of a metal plate and having one surface as an opening surface, and a core wire that is housed inside the housing and is near one side. A substantially rectangular circuit board having a mounting hole, and a coaxial in which the core wire portion is inserted into the core wire mounting hole and attached to the housing in a posture penetrating the side plate portion or the top plate portion of the housing In the method of manufacturing an electronic circuit unit, wherein the circuit board is fixed in a positioned state by the housing locking the locked portions provided at a plurality of locations of the circuit board. One of the main surfaces of the circuit board is provided by arranging the plurality of locked portions in a line-symmetrical positional relationship with a straight line connecting the one side of the other side and a midpoint of the other side parallel to the side as a symmetry axis. And the other main surface with two different postures to selectively face the top plate A circuit board is assembled in the housing, and a through-hole for penetrating the coaxial connector is provided in the housing, and then the core wire mounting hole is disposed in the vicinity of the through-hole. One of the two postures is selected, and the circuit board is assembled into the housing.

  In this way, the circuit board in which the plurality of locked portions locked at predetermined positions of the housing are arranged in a line-symmetrical positional relationship does not cause the locked portions to be locked even if the front and back are reversed around the symmetry axis. Since all can be arranged at the predetermined position of the casing, the circuit board can be stored and held in the casing regardless of whether the circuit board is turned upside down. When one main surface of the circuit board faces the top plate portion, a coaxial connector is attached to the side plate portion of the housing in the vicinity of the mounting hole for the core wire, and this protrudes sideways parallel to the circuit board. And a second usage pattern in which a coaxial connector is attached to the top plate portion of the housing in the vicinity of directly above the attachment hole for the core wire and protrudes upward in a direction perpendicular to the circuit board. Selectable. In addition, when the circuit board is turned upside down around the axis of symmetry, the core wire mounting holes are arranged at different positions with respect to the housing. Therefore, when the other main surface of the circuit board faces the top plate, this core wire A third usage pattern in which a coaxial connector is attached to the side plate portion of the housing in the vicinity of the mounting hole for the housing and protrudes sideways, and coaxial with the top plate portion of the housing in the vicinity immediately above the mounting hole for the core wire A fourth usage pattern in which the connector is attached and protrudes upward can be selected. Therefore, after providing a through-hole for penetrating the coaxial connector at a desired position of the housing, the circuit board is assembled into the housing in such a posture that the mounting hole for the core wire can be disposed in the vicinity of the through-hole. The electronic circuit unit having a structure corresponding to the above can be selectively manufactured. Therefore, by adopting this manufacturing method, it is possible to easily and inexpensively cope with various usage forms in which the mounting position and orientation of the coaxial connector are different from each other while keeping the circuit board in common. The top plate of the housing that covers the circuit board does not become a thin shield cover.

  The electronic circuit unit with a coaxial connector according to the present invention is a circuit having an input / output terminal group that can be stored and held in a housing and integrated as a mold terminal or the like, regardless of whether the circuit board is turned upside down. Can be inserted from either the front or back side of the board. Therefore, there is a remarkable effect that the circuit board and the input / output terminal group can be made inexpensively compatible with various usage forms having different attachment positions and orientations of the coaxial connector. In addition, since the top plate of the housing that covers the circuit board does not become a thin shield cover, this electronic circuit unit must ensure the required reliability without worrying about the mounting strength and shielding performance of the coaxial connector. Is easy.

  In the method of manufacturing an electronic circuit unit with a coaxial connector according to the present invention, the circuit board is placed in the housing in two postures in which one main surface and the other main surface of the circuit board are selectively opposed to the top plate portion of the housing. One of the above two attitudes is such that a through hole for allowing the coaxial connector to pass through is provided in the housing, and then the core wire mounting hole is disposed in the vicinity of the through hole. As a result, the circuit board is assembled into the housing, so that the circuit board can be shared and the coaxial connector mounting position and orientation can be easily and inexpensively adapted to various usage forms. Play. In addition, the electronic circuit unit manufactured in this way does not become a shield cover with a thin plate thickness on the top plate of the housing that covers the circuit board, so it has the required reliability without worrying about the mounting strength and shield performance of the coaxial connector. It is easy to secure.

1 is a perspective view of a tuner unit according to a first embodiment of the present invention. FIG. 2 is an exploded perspective view of the tuner unit shown in FIG. 1. It is explanatory drawing which shows the internal structure of the tuner unit of FIG. FIG. 3 is a top view of the circuit board shown in FIG. 2. It is a bottom view of the circuit board shown in FIG. It is a perspective view of the tuner unit which concerns on the 2nd Example of this invention. It is explanatory drawing which shows the internal structure of the tuner unit of FIG. It is a perspective view of the tuner unit which concerns on the example of 3rd Embodiment of this invention. It is explanatory drawing which shows the internal structure of the tuner unit of FIG. It is a perspective view of the tuner unit which concerns on the example of 4th Embodiment of this invention. It is explanatory drawing which shows the internal structure of the tuner unit of FIG. It is explanatory drawing which shows the mounting area | region on the motherboard of each tuner unit which concerns on the example of 1st-4th embodiment. It is explanatory drawing which shows two types of tuner units mounted on the motherboard.

  An embodiment of the present invention will be described with reference to the drawings. Each of the following embodiments of the electronic circuit unit with a coaxial connector is a tuner unit capable of receiving a television broadcast signal.

  1 to 3 show a tuner unit 11 according to the first embodiment. The tuner unit 11 includes a substantially rectangular bathtub-shaped casing 1 made of a metal plate, a substantially rectangular circuit board 2 provided with a high-frequency circuit and housed in the casing 1, and the circuit board 2. It is mainly composed of an input / output terminal group 3 attached to one end portion and a coaxial connector 4 attached to the top plate portion 1a of the housing 1. The tuner unit 11 is in a posture in which the coaxial connector 4 is vertically projected with respect to a mother board 10 (see FIG. 12) such as a television board, and a predetermined position (for example, a mounting area A1 or Used in the mounting area A2).

  The structure of the tuner unit 11 will be described in detail. The casing 1 is a shield case made of sheet metal having high mechanical strength, and the bottom side of the casing 1 is open. The casing 1 includes a top plate portion 1a having a through hole 1b (see FIG. 3) at predetermined positions, a side plate portion 1c hanging from four sides of the top plate portion 1a, and a side plate portion below the four corners of the top plate portion 1a. The configuration includes four mounting legs 1d depending from 1c, and four holding pieces 1e (see FIG. 3) cut and raised inward from the side plate portion 1c. The base end side of the coaxial connector 4 is inserted into the through hole 1b, and the outer shell conductor of the coaxial connector 4 is fixed to the top plate portion 1a by caulking or the like. The side plate portion 1 c surrounds the circuit board 2 assembled in the housing 1. The holding piece 1e is inserted and locked in the locked hole 2d (see FIG. 2) of the circuit board 2, and the circuit board 2 can be fixed in the housing 1 in a positioned state. . The mounting leg 1d is inserted and locked in a mounting hole (not shown) of the motherboard 10 so that the housing 1 can be placed and fixed at a predetermined position on the motherboard 10 when the tuner unit 11 is mounted. it can.

  As shown in FIG. 4, a large number of various electronic components 5 (not shown in FIG. 2) are mounted on one main surface 2 a of the circuit board 2, and high frequency is generated by these electronic components 5 and a wiring pattern (not shown). A circuit is configured. Near one side of the circuit board 2, a core wire mounting hole 2c that is an input end of the high-frequency circuit is provided. As shown in FIG. 3, the core wire portion 4a of the coaxial connector 4 is inserted (inserted and soldered) into the core wire mounting hole 2c. In addition, a large number of terminal mounting holes 2e are arranged along one side of the circuit board 2, and the base end side of each terminal 6 of the input / output terminal group 3 is inserted (inserted and soldered) into each terminal mounting hole 2e. And electrically connected to a wiring pattern (not shown). The input / output terminal group 3 is a molded terminal as shown in FIG. 2, and a large number of terminals 6 are integrated in parallel. As shown in FIG. 1, the distal end side of each terminal 6 of the input / output terminal group 3 attached to one end of the circuit board 2 extends downward outside the housing 1. The to-be-latched holes 2d are provided at four positions on the peripheral edge of the circuit board 2, and as described above, the circuit board 2 is attached to the housing by inserting and retaining the holding pieces 1e into the to-be-latched holes 2d. 1 is fixed in a positioning state. By storing the circuit board 2 in the housing 1 in this way, the high frequency circuit can be electromagnetically shielded by the top plate portion 1a and the side plate portion 1b. 5 shows the other main surface 2b of the circuit board 2. As shown in FIG.

  A straight line L shown in FIGS. 4 and 5 is a straight line connecting one side of the circuit board 2 on which the terminal mounting holes 1c are arranged and the midpoint of the other side parallel to the side. As is apparent from the figure, the terminal mounting holes 2e provided in the circuit board 2 are arranged in a line-symmetrical positional relationship with the straight line L as the symmetry axis. The four locked holes 2d provided in the circuit board 2 are also arranged in a line-symmetric positional relationship with the straight line L as the symmetry axis. Therefore, even if the circuit board 2 is turned upside down around the straight line L, the position of the terminal mounting hole 2e group does not change as a whole, and the position of the locked hole 2d group does not change as a whole (FIGS. 4 and 5). reference). That is, in the input / output terminal group 3, each terminal 6 can be inserted into each terminal mounting hole 2e from either the main surface 2a side or the main surface 2b side of the circuit board 2. Moreover, even if the circuit board 2 is assembled in the housing 1 in a posture in which any of the main surfaces 2a and 2b is opposed to the top plate portion 1a, the holding pieces 1e can always be inserted into all the locked holes 2d. .

  The coaxial connector 4 is called an F-type connector. The coaxial connector 4 is attached to the top plate portion 1a (peripheral edge portion of the through hole 1b) so that the base end portion of the outer shell conductor penetrates the through hole 1b, and the screw portion 4b of the outer shell conductor is connected to the housing 1. Protrudes outward. The core wire portion 4 a of the coaxial connector 4 protrudes into the housing 1 and is inserted into the core wire mounting hole 2 c of the circuit board 2. A cable connector (male connector) connected to the coaxial cable can be attached to and detached from the coaxial connector 4. In this embodiment, since the through hole 1b is provided near the corner near one short side of the top plate portion 1a of the housing 1, it protrudes outward from the through hole 1b. The coaxial connector 4 stands upright with respect to the top plate portion 1a. However, the opening position of the through hole 1b of the housing 1 can be appropriately selected, and the coaxial connector 4 can be attached to the side plate portion 1c as described later.

  When the tuner unit 11 is mounted on the mother board 10 such as a television board, the housing 1 is placed and fixed at a predetermined position on the mother board 10 by using the mounting legs 1d. The tip end side of the terminal 6 is connected to a connection land (not shown) on the mother board 10 side by soldering or the like. The tuner unit 11 is mounted in a region inside the peripheral portion of the motherboard 10 (such as the mounting region A1 and the mounting region A2 in FIG. 12), and is suitable for a usage pattern in which the coaxial connector 4 protrudes to the rear of the television receiver. It is.

  However, a usage form in which the tuner unit is mounted on the peripheral portion of the motherboard 10 and the coaxial connector 4 protrudes in a direction parallel to the motherboard 10 is also common. For example, if the coaxial connector 4 is attached to one side plate portion 1c hanging from the short side of the top plate portion 1a as in the tuner unit 12 shown in FIGS. It is suitable for a usage pattern for mounting in the mounting area B1, the mounting area B2, and the like. If the coaxial connector 4 is attached to the other side plate portion 1c hanging from the short side of the top plate portion 1a as in the tuner unit 13 shown in FIGS. This is suitable for a usage pattern for mounting in the mounting area C1, the mounting area C2, and the like. Further, even when the coaxial connector 4 is protruded in a direction perpendicular to the motherboard 10, the positional relationship between the input / output terminal group 3 and the coaxial connector 4 depends on the design restrictions on the motherboard 10 side, etc. It may be specified as shown in D1, D2, etc. In such a case, the tuner unit 11 shown in FIGS. 1 to 3 cannot cope, but like the tuner unit 14 shown in FIGS. 10 and 11, near the corner near the other short side of the top plate portion 1 a of the housing 1. If the coaxial connector 4 is attached, the tuner unit 14 is suitable for use in mounting in the mounting area D1, the mounting area D2, and the like.

  More specifically, as shown in FIGS. 6 and 7, the tuner unit 12 according to the second embodiment attaches the coaxial connector 4 to the side plate portion 1c that hangs down from the one short side of the top plate portion 1a. The configuration is the same as that of the tuner unit 11 (see FIGS. 1 and 3) according to the first embodiment except for the point protruding sideways. In other words, these two types of tuner units 11 and 12 have the same circuit board 2 stored and held in the same place in the housing 1 in the same posture, and the same input / output terminal group 3 is placed in the same place on the circuit board 2. The housing 1 is also substantially a common component except that the opening position of the through hole 1b is different. This tuner unit 12 is suitable for a usage form in which the coaxial connector 4 is mounted in the mounting area B1, the mounting area B2, etc. of FIG.

  As shown in FIGS. 8 and 9, the tuner unit 13 according to the third embodiment has the coaxial connector 4 attached to the side plate portion 1c that hangs down from the other short side of the top plate portion 1a. Except for the protruding point and the point where the circuit board 2 is turned upside down and assembled in the housing 1, the configuration is the same as that of the tuner units 11 and 12 described above. That is, in the third embodiment, the circuit board 2 is housed and held in the housing 1 in a posture in which the main surface 2b faces the top plate portion 1a, and the input / output terminal group 3 is preliminarily arranged on the main surface 2b side. To the circuit board 2. By doing so, the core wire mounting hole 2c can be brought close to the other short side of the top plate portion 1a, so that the tuner unit 13 is mounted in the mounting area C1, the mounting area C2, etc. of FIG. It is suitable for a usage pattern in which the coaxial connector 4 protrudes to the side or downward of the machine. As described above, even if the circuit board 2 is turned upside down around the straight line L, the position of the terminal mounting hole 2e group does not change as a whole, and the position of the locked hole 2d group does not change as a whole. In the input / output terminal group 3, the terminals 6 can be inserted into the terminal mounting holes 2e even from the main surface 2b side, and the circuit board 2 is mounted with the main surface 2b facing the top plate portion 1a. Even if it is incorporated in the body 1, the holding piece 1e can always be inserted into the locked hole 2d.

  10 and 11, when the circuit board 2 is turned upside down and assembled in the housing 1 as in the third embodiment, the coaxial connector 4 is attached to the top plate portion 1 a of the housing 1. Thus, the tuner unit 14 according to the fourth embodiment is obtained. That is, the tuner unit 14 is a tuner according to the third embodiment except that the coaxial connector 4 is attached near the corner near the other short side of the top plate 1a and protrudes upward. The configuration is the same as that of the unit 13 (see FIGS. 8 and 9). The tuner unit 14 is similar in appearance to the tuner unit 11 (see FIGS. 1 and 3) according to the first embodiment. For this reason, the tuner unit 14 is suitable for a usage form in which the coaxial connector 4 is mounted on the mounting area D1, the mounting area D2, etc. in FIG.

  As described above, the tuner units 11 to 14 according to the first to fourth embodiments are configured by substantially the same parts, and thus the tuner units 11 to 14 are selectively manufactured according to the desired usage pattern. It's easy to do. That is, after the through hole 1b is opened at a desired position of the top plate portion 1a or the side plate portion 1c of the housing 1, the input / output terminal group 3 is attached to the circuit board 2 from the main surface 2a side or the main surface 2b side. Thus, the circuit board 2 is assembled in the housing 1 in a posture in which the main surface 2a or the main surface 2b is opposed to the top plate portion 1a. Then, after the base end portion of the coaxial connector 4 is inserted into the through hole 1b and the core wire portion 4a is inserted into the core wire mounting hole 2c of the circuit board 2, the coaxial connector 4 is connected to the casing 1 (the periphery of the through hole 1b). Part). When manufacturing the tuner units 11 and 12 in this manufacturing process, the circuit board 2 may be assembled into the housing 1 with the main surface 2a facing the top plate 1a. In the case of manufacturing, the circuit board 2 may be assembled into the housing 1 with the main surface 2b facing the top plate 1a. In any case, since the holding piece 1e of the housing 1 and the locked hole 2d of the circuit board 2 do not cause misalignment, the circuit board 2 can be accommodated in the housing 1 in a positioned state. . Moreover, since the input / output terminal group 3 can insert each terminal 6 into each terminal mounting hole 2e from the main surface 2a side or the main surface 2b side, any main surface of the circuit board 2 is used as the top plate portion 1a. Also, the input / output terminal group 3 may be a common part, and there is no practical difference in the mounting operation.

  In each of the above embodiments, the bottom surface side of the housing 1 is opened, but a ground layer (not shown) provided on the back surface side of the motherboard 10 is overlapped with the mounting area of the tuner unit. There is no possibility that the shield performance is impaired by this opening. However, when the ground layer on the motherboard 10 side does not overlap with the opening on the bottom surface side of the housing 1, it is preferable that a shield cover that covers this opening is fitted to the housing 1.

  Further, in the configuration in which the main surface 2b of the circuit board 2 is opposed to the top plate portion 1a like the tuner units 13 and 14, the tall electronic component 5 to be mounted on the main surface 2a can come into contact with the motherboard or the shield cover. When there is a property, it is preferable to mount only the tall electronic component 5 on the main surface 2b in advance.

  As described above, the four types of tuner units 11 to 14 having different attachment positions and orientations of the coaxial connector 4 share the circuit board 2, the input / output terminal group 3, and the like, and are formed in the housing 1. If the opening position of the through-hole 1b is selected and the circuit board 2 is turned upside down if necessary, it can be manufactured by substantially the same procedure. In other words, a tuner unit having a desired usage pattern can be selectively manufactured with the same parts, so that various usage patterns can be easily and inexpensively handled. In addition, the tuner unit manufactured in this way does not have a thin shield cover for the top plate portion 1a of the casing 1 that covers the circuit board 2, so that there is no need to worry about the mounting strength and shield performance of the coaxial connector 4. It is easy to ensure reliability.

DESCRIPTION OF SYMBOLS 1 Case 1a Top plate part 1b Through-hole 1c Side plate part 1e Holding piece 2 Circuit board 2a, 2b Main surface 2c Core wire attachment hole 2d Locked hole (locked part)
2e Terminal mounting hole 3 Input / output terminal group 4 Coaxial connector 4a Core wire part 5 Electronic component 6 Terminal 10 Motherboard 11-14 Tuner unit (electronic circuit unit)
A1, A2, B1, B2, C1, C2, D1, D2 Mounting area L Straight line (axis of symmetry)

Claims (2)

A substantially rectangular parallelepiped housing made of a metal plate and having one surface as an opening surface, a substantially rectangular circuit board housed in the housing and having a mounting hole for a core wire near one side, and the circuit board An input / output terminal group inserted into a plurality of terminal mounting holes arranged along one side and extending to the outside of the housing; and a posture penetrating a side plate portion or a top plate portion of the housing A coaxial connector attached to the housing and having a core wire portion inserted into the core wire mounting hole, and the housing locks the locked portions provided at a plurality of locations on the circuit board. An electronic circuit unit in which a circuit board is fixed in a positioning state,
The plurality of locked portions are disposed in a line-symmetrical positional relationship with a straight line connecting the one side of the circuit board and the midpoint of the other side parallel to the circuit board as a symmetry axis, and the plurality of terminals An electronic circuit unit, wherein the mounting holes are arranged in a line-symmetrical positional relationship. A substantially rectangular parallelepiped housing made of a metal plate and having one surface as an open surface, a substantially rectangular circuit board housed in the housing and having a core wire mounting hole near one side, and the housing A coaxial connector attached to the housing in a posture penetrating the side plate portion or the top plate portion and having a core wire portion inserted into the attachment hole for the core wire and provided at a plurality of locations on the circuit board. A method of manufacturing an electronic circuit unit in which the circuit board is fixed in a positioning state by locking the stopper with the housing,
By arranging the plurality of locked portions in a line-symmetric positional relationship with a straight line connecting the one side of the circuit board and the midpoint of the other side parallel to the one side as a symmetry axis, A through hole for allowing the circuit board to be assembled into the housing in two postures so that the main surface and the other main surface are selectively opposed to the top plate portion, and through the coaxial connector. After being provided in the casing, the circuit board is assembled into the casing by selecting one of the two postures so that the core wire mounting hole is disposed in the vicinity of the through hole. A method of manufacturing an electronic circuit unit.

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