JP2012164899A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an electronic apparatus in which a switch earth metal fitting is arranged between switches.SOLUTION: The electronic apparatus includes at least two switches 30A and 30B which have a switch case 35 respectively and are mounted on a substrate so that the switch cases 35 face each other, a switch earth metal fitting 40 which is inserted between the switch cases 35 and is connected electrically to two switch cases 35 respectively, and a cover member that is fitted to a housing case. The switch earth metal fitting 40 includes a fit-in part 42 which is inserted between the switch cases 35, and a wing part 44 provided to be continuous from the fit-in part 42. Under such condition as the switch earth metal fitting 40 is inserted between the switch cases 35 and as the cover member is fitted to the housing case, the wing part 44 contacts to the cover member, and the two switch cases 35 are electrically connected to the cover member by way of the switch earth metal fitting 40.

Description

  The present invention relates to an electronic device, and more particularly to an electronic device that can be used as a booster for joint television reception.

  An electronic device such as a booster is used in a television joint reception system or the like. Japanese Utility Model Laid-Open No. 3-101593 (Patent Document 1) discloses an electronic apparatus including a ground metal fitting (elastic metal plate) as an example of such an electronic apparatus. The ground metal fitting is disposed between the ground conductor of the printed board and the case front panel in order to secure the ground of the printed board. Noise may occur depending on the frequency band used in the TV joint reception system or the like, and the grounding metal is provided to suppress the generation of the noise.

  When an electronic device such as a booster used in a joint reception system or the like is manufactured, each arrangement of an electronic circuit and an electronic component is determined in a pattern design stage. Electronic devices are manufactured based on design matters. Thereafter, the grounding metal is selectively disposed at a predetermined location according to the frequency characteristics of the electronic circuit. It is difficult to appropriately determine the arrangement of the ground metal fittings based on the calculation at the design stage, and the ground metal fittings are arranged at appropriate positions as necessary after the actual electronic device is manufactured.

Japanese Utility Model Publication No. 3-101593

  In recent years, electronic devices such as boosters used for television joint reception systems and the like tend to be miniaturized. With the downsizing of electronic devices, for example, the distance between switches (switch cases) arranged on a substrate to form an attenuator (attenuator) tends to become narrower.

  The grounding metal fitting disclosed in Japanese Utility Model Publication No. 3-101593 (Patent Document 1) is provided with one grounding metal so as to hold one switch case. It is necessary to provide a wide space between the switches in advance, which is one of the factors that make it difficult to reduce the size of electronic devices.

  The present invention has been made in view of the above circumstances, and is an electronic device in which a switch grounding metal fitting is disposed between switches, and an electronic device that can be reduced in size. The purpose is to provide.

  An electronic device according to the present invention includes a housing case having an opening, a substrate housed in the housing case, and a switch case, and is mounted on the substrate so that the switch cases face each other. And at least two switches that are inserted between the switch cases and electrically connected to the two switch cases, respectively, and attached to the housing case so as to cover the opening. A cover member, and the switch grounding metal fitting is inserted between the switch cases and extends along a predetermined direction so as to be sandwiched between the switch cases, and In the state where the switch grounding fitting is inserted between the switch cases, the switch insertion metal part is connected to the insertion part. In the state where the switch grounding metal fitting is inserted between the switch cases and the cover member is attached to the housing case, The two switch cases are in contact with the cover member and are electrically connected to the cover member through the switch ground metal fitting.

  Preferably, in a state where the switch ground metal fitting is fitted between the switch cases, the switch ground metal fitting and the substrate are in an electrically non-contact state.

  Preferably, the switch earth metal fitting is provided with a positioning portion at an end portion in the extending direction of the fitting insertion portion, and the positioning of the switch earth metal fitting is inserted between the switch cases. The portion regulates the position of the switch ground metal fitting with respect to the switch case.

  Preferably, the positioning portions are provided at both end portions in the extending direction of the fitting insertion portion, and in the state where the switch ground metal fitting is fitted between the switch cases, the two positioning portions are provided. The position of the switch ground metal fitting with respect to the switch case is regulated.

  Preferably, the wing-like portion is connected to both end portions in the extending direction of the fitting insertion portion of the switch ground metal fitting, respectively.

  ADVANTAGE OF THE INVENTION According to this invention, it is an electronic device by which switch earth metal fittings are arrange | positioned between switches, Comprising: The electronic device which can achieve size reduction can be obtained.

It is a perspective view which shows the state (state before being assembled) of the electronic device in embodiment. It is a perspective view which expands and shows the switch and switch grounding metal fitting of an electronic device in an embodiment. It is a side view which shows the switch ground metal fitting with which the electronic device in embodiment is equipped. It is a top view which shows the switch earth metal fitting with which the electronic device in embodiment is equipped. It is a front view which shows the switch earth metal fitting with which the electronic device in embodiment is equipped. It is sectional drawing which shows the state by which the switch earth | ground metal fitting was inserted and inserted between switches of the electronic device in embodiment, and also the cover member was attached to the storage case. It is a figure which shows the frequency versus noise characteristic of the electronic device in embodiment. It is a figure which shows the frequency versus noise characteristic of what removed the switch earth metal fitting from the electronic device in embodiment. It is a front view which shows the other form of the switch ground metal fitting with which the electronic device in embodiment is equipped. It is a front view which shows the further another form of the switch earthing | grounding metal fitting with which the electronic device in embodiment is equipped.

  Embodiments based on the present invention will be described below with reference to the drawings. In the description of the embodiments, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, or the like unless otherwise specified. In the description of the embodiments, the same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

(Electronic device 100)
FIG. 1 is a perspective view showing a disassembled state (state before assembly) of electronic device 100 in the present embodiment. The electronic device 100 is typically used as a bidirectional booster for joint television reception (for example, the frequency band is 10 to 60 MHz for the upstream signal and 70 to 770 MHz for the downstream signal). As shown in FIG. 1, the electronic device 100 includes a housing case 10, a substrate 20 (printed circuit board), a plurality of switches (attenuators, equalizers, band switching) including switches 30 </ b> A and 30 </ b> B, a switch grounding bracket 40, and a cover member 50. Is provided.

  In a state where the electronic device 100 is assembled, the cover member 50 is attached to the housing case 10 so as to cover the opening 14 of the housing case 10. Further, a lid member (not shown) is attached to the storage case 10 so as to cover the storage case 10 and the cover member 50. The cover member 50 is fixed to the housing case 10 by attaching the lid member.

  The housing case 10 has a peripheral wall portion 12 and an opening portion 14. The substrate 20 (printed substrate) is accommodated in the accommodation case 10 so as to be surrounded by the peripheral wall portion 12. A plurality of switches such as switches 30A and 30B are mounted side by side on the substrate 20 in order to configure, for example, an attenuator (equalizer, band switching). In addition, an input / output terminal 22, a monitor terminal 24, a fuse unit 26, and the like are mounted on the substrate 20, respectively. Although details will be described later, a switch grounding metal fitting 40 is inserted between the switches 30A and 30B.

  The cover member 50 is provided with a plurality of holes 52, 54 and 56. In the state in which the electronic device 100 is assembled, the operation part 32 (see FIG. 2) of the switches 30 </ b> A and 30 </ b> B is exposed from the hole part 52 to the upper surface side of the cover member 50. The monitor terminal 24 is exposed from the hole 54 to the upper surface side of the cover member 50. The fuse unit 26 is exposed from the hole 56 to the upper surface side of the cover member 50. These switches and monitor terminals are respectively exposed on the upper surface side of the lid member, and the upper surface side of the lid member constitutes the operation surface of the electronic device 100.

  FIG. 2 is an enlarged perspective view showing the switches 30A and 30B and the switch ground metal fitting 40. FIG. Each of the switches 30A and 30B includes a switch case 35 formed from a conductive member into a hollow, substantially rectangular parallelepiped shape. The switch case 35 includes side surfaces 31 and 33 and a side surface 34 (see also FIG. 5), and the operation unit 32 is provided on the upper surface side. The switches 30A and 30B are arranged such that the side surfaces 34 of the switch case 35 face each other (see also FIG. 5).

(Switch ground bracket 40)
FIG. 3 is a side view showing the switch ground metal fitting 40. FIG. 4 is a plan view of the switch ground metal fitting 40. FIG. 5 is a front view showing the switch grounding bracket 40 (and the switches 30A and 30B). The switch ground metal fitting 40 will be described in detail with reference to FIGS.

  2 to 5, the switch ground metal fitting 40 is inserted between the switch cases 35 (side surfaces 34) and electrically connected to the switch cases 35 of the switches 30 </ b> A and 30 </ b> B. The switch ground metal fitting 40 can be configured by bending a thin plate-like copper member by press molding or the like. The switch ground metal fitting 40 includes a fitting insertion part 42, a wing-like part 44, and a positioning part 46. The switch ground metal fitting 40 may be configured symmetrically.

  The fitting portion 42 is configured by arranging two thin flat plate-like members in a substantially V shape when viewed from the front (see FIG. 5). In the lower end part 43 of the fitting insertion part 42, it is good for these two flat members to contact each other (mode shown in FIG. 5). The insertion portion 42 may be configured by bending a single flat plate member into a substantially V shape when viewed from the front. The insertion portion 42 is molded in advance so as to maintain a predetermined angle θ (see FIG. 5).

  The insertion portion 42 is inserted between the switch cases 35 (see FIG. 4). The insertion portion 42 has a predetermined length along a direction (arrow AR42 direction) parallel to the direction in which the side surfaces 34 extend so that the entire insertion portion 42 is sandwiched between the side surfaces 34 of the switch case 35. It extends in the length.

  Two wing-like portions 44 are provided above both ends of the insertion portion 42 in the extending direction of the insertion portion 42 (in the direction of the arrow AR42). The wing-like portion 44 is continuously provided from the fitting insertion portion 42 at the bent portion 45. The wing-like portion 44 is configured by bending a thin flat plate-like member outward at a bent portion 45. The wing-like portion 44 is positioned on the opposite side of the insertion portion 42 from the substrate 20 in a state where the switch ground metal fitting 40 (insertion portion 42) is inserted between the switch cases 35 (see FIG. 3). .

  Positioning portions 46 are respectively provided below both ends of the insertion portion 42 in the extending direction of the insertion portion 42 (arrow AR42 direction). The positioning portion 46 is configured to hang downward on both outer sides of the fitting insertion portion 42 when a thin flat plate-like member is curved and deformed into a circular shape, for example. In the positioning part 46, the two thin flat plate-like members constituting the fitting insertion part 42 and the wing-like part 44 are connected in series so as to be symmetrical.

  As shown in FIG. 3, one positioning portion 46 (left side of FIG. 3) is spaced from the side surface 31 in a state where the switch ground metal fitting 40 (insertion portion 42) is inserted between the switch cases 35. Opposite with a slight gap of L3. Similarly, the other positioning portion 46 (right side in FIG. 3) has a slight gap L4 on the side surface 33 when the switch grounding fitting 40 (insertion portion 42) is inserted between the switch cases 35. Opposite with a gap. Positioning portions 46 provided on both outer sides of the fitting insertion portion 42 come into contact with the side surfaces 31 and 33 of the switch case 35, so that the position of the switch ground metal fitting 40 with respect to the switch case 35 is restricted. Further, when the positioning portion 46 abuts against the side surfaces 31 and 33 of the switch case 35, the position of the switch ground metal fitting 40 with respect to the switch case 35 is regulated.

  When the switch ground metal fitting 40 (insertion portion 42) is inserted between the switch cases 35, the lower end portion 43 of the insertion portion 42 and the substrate 20 are provided with a gap L1 therebetween. Good. The lower end portion of the positioning portion 46 and the substrate 20 may be provided apart from each other with an interval L2. According to this configuration, the switch ground metal fitting 40 and the substrate 20 are in an electrically non-contact state.

  Referring to FIG. 5, as described above, the switch ground metal fitting 40 is inserted and inserted between the side surfaces 34 of the switch case 35 of the switches 30 </ b> A and 30 </ b> B (see arrow AR <b> 1). When the insertion portion 42 is inserted between the side surfaces 34, the insertion portion 42 is deformed so that the angle θ is reduced. By configuring the insertion portion 42 in a substantially V shape in front view, the insertion portion 42 can be easily inserted between the side surfaces 34. The positions of the switches 30A and 30B of the switch ground metal fitting 40 with respect to the switch cases 35 (in the vertical direction in FIG. 5) are restricted by the bent portion 45.

  Due to the restoring force generated from the elasticity of the insertion part 42, the insertion part 42 presses the switch case 35 of the switch 30A and the switch case 35 of the switch 30B (see arrow AR3). By the pressing, friction is generated between the switch ground metal fitting 40 and each switch case 35, and the switch ground metal fitting 40 is securely fixed to each switch case 35.

  Due to the deformation of the insertion portion 42, the wing-shaped portion 44 is deformed so as to stand up (away from the switch case 35) (see arrow AR2). The wing portion 44 is fixed in a plate spring shape above the switch case 35.

  Referring to FIG. 6, after switch earth metal fitting 40 is fitted between switch cases 35 of switches 30A and 30B, cover member 50 is attached to housing case 10 (see FIG. 1) (arrows). See AR4). The operation portions 32 of the switch 30A and the switch 30B are disposed in the hole portion 52 of the cover member 50. By attaching the cover member 50 to the housing case 10 (see FIG. 1), the wing-like portion 44 is pressed by the back surface of the cover member 50. By the pressing, the wing portion 44 and the cover member 50 come into strong contact. The switch case 35 of the switch 30A and the switch case 35 of the switch 30B are electrically connected to the cover member 50 through the switch ground metal fitting 40, respectively. With this configuration, the switches 30A and 30B can be reliably grounded.

(Action / Effect)
In electronic device 100 of the present embodiment, one switch grounding bracket 40 is electrically connected to each of two switches 30A and 30B. In order to secure grounding for the two switches 30A and 30B, only one switch grounding bracket 40 has to be prepared.

  In the grounding metal fitting disclosed in Japanese Unexamined Utility Model Publication No. 3-101593 (Patent Document 1) described at the beginning, one grounding metal is provided so as to hold one switch case. One of the factors that make it difficult to reduce the size of an electronic device is to provide a wide space between the switches in preparation for the need to secure grounding between two adjacent switches. It has become one.

  On the other hand, in the electronic device 100, even when the distance between the switches arranged side by side like the switches 30A and 30B is designed to be narrow, by using the switch ground metal fitting 40, the two switches 30A and 30A It becomes possible to secure the ground of 30B at the same time. When the interval between switches arranged side by side, such as the switches 30A and 30B, is set to be the same, the use of the switch grounding metal fitting 40 makes it possible to reliably secure the ground for two adjacent switches. . According to the electronic device 100 provided with the switch ground metal fitting 40, the interval between adjacent switches can be designed to be narrow, and further miniaturization can be achieved.

  In addition, the switch ground metal fitting 40 used in the electronic device 100 according to the present embodiment has a lower end of the insertion part 42 in a state where the switch ground metal fitting 40 (fitting insertion part 42) is inserted between the switch cases 35. The portion 43 and the substrate 20 are separated from each other with an interval L1 (see FIG. 6). The lower end portion of the positioning portion 46 and the substrate 20 are separated from each other with an interval L2 (see FIG. 6).

  In the grounding metal fitting disclosed in Japanese Unexamined Utility Model Publication No. 3-101593 (Patent Document 1) described at the beginning, one grounding metal is provided so as to hold one switch case. The position of the earth metal fitting with respect to the switch case (vertical direction) is determined by the contact between the earth metal fitting and the substrate, and a configuration is adopted in which the earth metal fitting and the substrate are in direct contact.

  Therefore, in the past, since there is a possibility that a grounding metal fitting is arranged around the switch case of the board, it cannot be used for pattern formation of an electronic circuit, and is secured as an empty area from the pattern design stage. It was necessary to keep it. In addition, although the structure which floats a grounding metal with respect to a board | substrate in the state in which the grounding metal was attached was also employ | adopted, it was complicated and caused the increase in manufacturing cost.

  On the other hand, in the electronic device 100 according to the present embodiment, the position of the switch ground metal 40 in the switches 30A and 30B with respect to the switch cases 35 (in the vertical direction in FIG. 6) is easily restricted by the bent portion 45. Even in the state where the switch ground metal fitting 40 is attached, the switch ground metal fitting 40 does not directly contact the substrate 20. The area around the switch case 35 of the substrate 20 can also be effectively used for pattern formation of electronic circuits. Therefore, according to the electronic device 100 including the switch grounding metal fitting 40, it is possible to further reduce the size.

  FIG. 7 is a diagram illustrating a frequency-noise characteristic in a part of the upstream band as an example of the electronic device 100 including the switch ground metal fitting 40. FIG. 8 is a diagram showing frequency-to-noise characteristics in a part of the upstream band as an example of the electronic device 100 from which the switch ground metal fitting 40 is removed. When FIG. 7 is compared with FIG. 8, in the frequency regions RA and RB, the electronic device 100 including the switch ground metal fitting 40 (see FIG. 7) has the switch ground metal fitting 40 removed from the electronic device 100 (FIG. 7). It can be seen that the electrical noise is reduced compared to (see 8). Therefore, it can be seen that the provision of the switch grounding metal fitting 40 in the electronic device 100 ensures the grounding and provides good electrical characteristics.

  As shown in FIG. 2, the switch grounding metal fitting 40 used in the electronic device 100 according to the present embodiment is provided with positioning portions 46 on both outer sides in the extending direction of the fitting insertion portion 42 (arrow AR42 direction). The positioning part 46 should just be provided as needed, for example, may be provided only in the one end outer side in the extension direction (arrow AR42 direction) of the fitting insertion part 42. FIG. In the case where the positioning portion 46 is not provided, it is preferable that one member be bent into a substantially V shape without forming the fitting insertion portion 42 from two members.

  In addition, the switch ground metal fitting 40 used in the electronic device 100 in the present embodiment is provided with two wing-like portions 44 above both ends in the extending direction of the fitting insertion portion 42 (arrow AR42 direction). One wing-like portion 44 may be provided above both ends of the fitting insertion portion 42 as needed. Further, the two wing-like portions 44 may be provided only above one end of the fitting insertion portion 42, and the one wing-like portion 44 is provided only above one end of the fitting insertion portion 42. May be.

  As shown in FIG. 2, the positioning portion 46 of the switch ground metal fitting 40 used in the electronic device 100 in the present embodiment is configured by bending a thin flat plate member into a circular shape, for example. Like the switch ground metal fitting 40A shown in FIG. 9, the positioning part 46 may be curved and deformed in a substantially rhombus shape in front view, and like the switch ground metal fitting 40B shown in FIG. The shape may be curved and deformed. Further, although the present embodiment has been described based on the electronic device 100 as a bidirectional booster, the present invention can also be used for an electronic device as a unidirectional booster.

  As mentioned above, although embodiment based on this invention was described, embodiment disclosed this time is an illustration and restrictive at no points. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 10 Storage case, 12 Perimeter wall part, 14 Opening part, 20 Board | substrate, 22 Input / output terminal, 24 Monitor terminal, 26 Fuse unit, 30A, 30B Switch, 31, 33, 34 Side surface, 32 Operation part, 35 Switch case, 40, 40A, 40B Switch earth metal fitting, 42 Insertion part, 43 Lower end part, 44 Wing part, 45 Bending part, 46 Positioning part, 50 Cover member, 52, 54, 56 Hole part, 100 Electronic equipment, AR1, AR2, AR3 AR4, AR42 arrows, L1, L2, L3, L4 intervals, RA, RB frequency domain.

Claims (5)

A storage case having an opening;
A substrate housed in the housing case;
Each having a switch case, and at least two switches mounted on the substrate such that the switch cases face each other;
Switch earth metal fittings inserted between the switch cases and electrically connected to the two switch cases,
A cover member attached to the housing case so as to cover the opening,
The switch ground bracket is
An insertion portion that is inserted between the switch cases and extends along a predetermined direction so as to be sandwiched between the switch cases;
A wing-like portion that is connected to the insertion portion, and is located on the opposite side of the substrate from the insertion portion in a state where the switch ground metal fitting is inserted between the switch cases,
In a state where the switch ground metal fitting is inserted between the switch cases and the cover member is attached to the housing case, the wing-shaped portion contacts the cover member, and the two switch cases are the switch Electrically connected to the cover member through a grounding fitting,
Electronics. In the state in which the switch grounding metal fitting is inserted between the switch cases, the switch grounding metal fitting and the substrate are in an electrically non-contact state.
The electronic device according to claim 1. In the switch ground metal fitting, a positioning portion is provided at an end portion in the extending direction of the fitting insertion portion,
In a state in which the switch ground metal fitting is inserted between the switch cases, the positioning portion regulates the position of the switch ground metal fitting with respect to the switch case.
The electronic device according to claim 1. The positioning portions are respectively provided at both end portions in the extending direction of the fitting insertion portion,
In a state in which the switch ground metal fitting is inserted between the switch cases, the two positioning portions respectively regulate the position of the switch ground metal with respect to the switch case.
The electronic device according to claim 3. The wing-like parts are respectively connected to both ends in the extending direction of the fitting insertion part of the switch ground metal fitting,
The electronic device in any one of Claims 1-4.

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