JP2013093815A - Electronic apparatus, video display unit and television broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus which can stably bring a cover for a terminal for enabling grounding of EMI noise into contact with the terminal and to provide a video display unit and a television broadcast receiver.SOLUTION: A contact section 96 which is brought into contact with a periphery of an electrode section 8a of a terminal 8 is arranged in a wide board section 91 of a cover 9 including: the wide board section 91 confronted with one face of a control circuit board 71 where the terminal 8 having the electrode section 8a and an electronic component are mounted on one face; and a narrow board section 92 which continues to an edge of the wide board section 91 and is confronted with a peripheral face of the control circuit board 71. A support section 94 for supporting the control circuit board 71, and an opening 95 confronted with the contact electrode section 8a are installed in the narrow board section 92. EMI noise is grounded to a ground side member 6 via the cover 9 from the contact section 96.

Description

  The present invention relates to an electronic device, a video display device, and a television broadcast receiver that can reduce EMI noise (Electromagnetic Interference).

  Electronic devices equipped with terminals such as recording media devices such as recording / reproducing machines that use recording media such as flat-screen televisions such as liquid crystal televisions and Blu-ray discs (BDs) are exposed to the outside. Since the connection electrode portion is an external part of the electronic device, a resin cover and a sheet metal cover are used as a cover for the terminal.

  It is generally known that EMI noise can be reduced by grounding from a terminal in an electronic device on which the terminal is mounted. When the grounding side member is the sheet metal cover, the sheet metal cover is stable with the terminal. In order to make contact, a gasket for EMI noise is used for the circuit board on which the terminal is mounted, and EMI noise is reduced by sandwiching the gasket between the sheet metal cover for the terminal and the terminal. It is configured to be able to.

  As a structure for preventing EMI noise, a contact plate having a fixed plate portion fixed to a circuit board and two contact plate portions extending in different directions from an edge portion of the fixed plate portion is provided. With the fixed plate portion fixed to the circuit board, one contact plate portion contacts the terminal, the other contact plate portion contacts the ground side member, and EMI noise is grounded from the contact to the ground side member. The structure which prevents the EMI noise comprised by this is known (for example, refer patent document 1).

JP 2008-171616 A

  However, since recent thin televisions are increasingly thinner despite having a backlight unit behind the display unit having a display surface on the front side, the gasket for EMI noise and the contact in Patent Document 1 It is necessary to take measures to eliminate the dedicated parts such as the child and to make stable contact with the terminals.

  The applicant of the present invention provides a circuit board on which terminals and electronic components are mounted on the support plate of the backlight unit having a light source and a metal support plate that supports the light source, and a steel plate cover for the terminal. By providing a contact portion that bends toward the terminal side and contacts the outer surface of the terminal on the steel plate cover of the electronic device that is mounted separately, a dedicated part such as a gasket is eliminated, and EMI noise is supported from the steel plate cover. The one that was configured to be grounded directly to the board was developed first.

  However, in this electronic device, when the support plate as the ground side member is distorted by heat generated by the light source of the backlight unit, and the support plate is bent in the thickness direction, the support plate While the terminal is biased to the bending side of the support plate together with the mounted circuit board, the relatively rigid steel plate cover will not be biased to the bending side of the support plate, and the contact portion of the steel plate cover is not in contact with the terminal. There was a problem of contact, and improvement measures were desired. Further, since the steel sheet of the steel sheet cover has a higher material cost than a general steel sheet, further cost reduction measures have been demanded.

  The present invention has been made in view of such circumstances, and a main object of the present invention is to stably contact a terminal cover capable of grounding EMI noise with the terminal and to prevent the terminal from being off-centered. It is another object of the present invention to provide an electronic device, a video display device, and a television broadcast receiver capable of forming a terminal cover with a relatively inexpensive material.

  The electronic device according to the present invention is an electronic device including a conductive cover that covers a terminal on a circuit board on which an electronic component is mounted. The cover is provided on a support portion that supports the circuit board and an outer surface of the terminal. It has the contact part which contacts.

  In this invention, since the terminal cover capable of grounding EMI noise supports the circuit board on which the terminal is mounted, it is affected by the distortion of the grounding side member to which the cover is mounted. Without contact, the contact part of the cover can be brought into stable contact with the terminal, contact failure can be eliminated, and the cover for the terminal has the contact part, so that it is provided with a dedicated part such as a gasket. In comparison, the electronic device can be made thinner. In addition, since the cover has a support portion and a contact portion, the terminal can be prevented from being off-centered, and the cover can be made of a relatively inexpensive material such as an iron plate. Can be reduced.

Moreover, it is preferable that the electronic device according to the present invention has a configuration in which the support portion is disposed at least on the side where the terminals are mounted.
In the present invention, the circuit board and the terminal portion can be sandwiched between the support portion and the contact portion provided in the terminal cover, so that it is not affected by the distortion or the like of the ground side member. The contact portion of the cover can be more stably brought into contact with the terminal while preventing the terminal from being off-centered.

Moreover, it is preferable that the electronic device according to the present invention has a configuration in which the support portion and the contact portion are integrally formed.
In the present invention, since the support portion and the contact portion are formed by the molding die for forming the terminal cover, the cost of the cover having the support portion and the contact portion, and hence the cost of the electronic device including the cover can be reduced. It can be further reduced.

In the electronic device according to the present invention, it is preferable that the cover has a second contact portion that contacts the outer surface at a position separated from a position where the contact portion contacts.
In this invention, the contact portion and the second contact portion are in contact with the outer surface of the terminal, the contact area with the terminal of the cover can be increased, and EMI noise can be grounded more efficiently. .

In the electronic device according to the present invention, the terminal is disposed so that the electrode portion faces an edge of the circuit board, and the cover includes a wide plate portion facing the one surface of the circuit board and the wide plate. It is preferable to have a narrow plate portion that continues to the edge of the portion and faces the peripheral surface of the circuit board, and that the narrow plate portion has an opening that faces the electrode portion of the terminal.
In this invention, since the positional relationship between the electrode portion of the terminal and the opening of the cover can be maintained between the support portion and the contact portion, the connection tool that is inserted into and removed from the opening and is brought into contact with and separated from the electrode portion. The contact / separation operation can be performed accurately.

In addition, a video display device according to the present invention includes a display unit having a video display surface and a grounding side member to which the cover is attached, and includes the electronic device described above.
In the present invention, the terminal cover capable of grounding EMI noise supports the circuit board on which the electronic component and the terminal are mounted, and the cover is attached to the ground side member. The contact part of the cover can be stably brought into contact with the terminal without being affected by the distortion of the grounding side member, etc., and contact failure can be eliminated, as compared with those equipped with dedicated parts such as gaskets. The video display device can be made thin, and the cost of the video display device including the cover can be reduced.

The television broadcast receiver according to the present invention includes a receiving unit that receives a television broadcast signal, and the receiving unit receives the television broadcast signal and displays a television image on the video display surface of the display unit. A video display device is included.
In this invention, a television broadcast signal can be received and a television image can be displayed on the display surface of the display unit.

  According to the present invention, the contact portion of the terminal cover capable of grounding EMI noise can be brought into stable contact with the terminal without being affected by the distortion of the grounding side member, thereby eliminating contact failure. In addition, the terminal can be prevented from being off-centered, and the electronic device and the television broadcast receiver can be made thinner than those provided with a dedicated component such as a gasket. In addition, the cover can be made of a relatively inexpensive material such as an iron plate, so that the cost of the cover, and thus the cost of the electronic device including the cover and the television broadcast receiver can be reduced.

It is a disassembled perspective view which shows schematic structure of a television broadcast receiver. It is a disassembled perspective view which shows schematic structure of a liquid crystal video display apparatus. It is a rear view which shows the structure of the electronic device which concerns on this invention. It is the front view which abbreviate | omitted one part which shows the structure of the electronic device which concerns on this invention. It is a rear view which shows the structure of the circuit board part of the electronic device which concerns on this invention. It is the enlarged top view which shows the structure of the circuit board part of the electronic device which concerns on this invention. It is a perspective view which shows the structure of the cover part of the electronic device which concerns on this invention. It is the perspective view which expanded a part which shows the structure of the cover part of the electronic device which concerns on this invention. It is the IX-IX line expanded sectional view of FIG. FIG. 6 is an enlarged sectional view taken along line X-X in FIG. 5. It is an expanded sectional view which shows the other structure of the cover part of the electronic device which concerns on this invention. It is an expanded sectional view which shows the other structure of the cover part of the electronic device which concerns on this invention.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. In the description, a display device having a display surface on the front side and having a substantially rectangular parallelepiped will be described as an example. The display device includes a liquid crystal display device main body including a backlight unit, and includes a reception unit that receives a television broadcast signal. The reception unit receives the television broadcast signal and displays a television image on the display surface. Includes a broadcast receiver. FIG. 1 is an exploded perspective view showing a schematic configuration of a television broadcast receiver, and FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal image display device.

  A television broadcast receiver includes a liquid crystal display unit A including a backlight unit, cabinets B and C that house the liquid crystal display unit A therebetween, a power source D, a tuner E, and a stand F. Consists of. The liquid crystal display unit A is a horizontally long and substantially rectangular parallelepiped as a whole, and is housed in the cabinets B and C in a vertically placed state. As shown in FIG. 2, the liquid crystal display unit A includes a liquid crystal panel G that is a display panel and a backlight unit H that is an external light source. The liquid crystal panel G and the backlight unit H are frame-shaped bezels and the like. Are integrally held by the holding frames J and K to constitute a panel module (liquid crystal display unit).

Embodiment 1
3 is a rear view showing the configuration of the electronic device according to the present invention, FIG. 4 is a front view showing a part of the configuration of the electronic device, and FIG. 5 is a rear view showing the configuration of the circuit board portion of the electronic device. 6 is an enlarged plan view showing the configuration of the circuit board portion of the electronic device, FIG. 7 is a perspective view showing the configuration of the cover portion of the electronic device, and FIG. 8 is a partially enlarged perspective view showing the configuration of the cover portion of the electronic device. 9 is an enlarged sectional view taken along line IX-IX in FIG. 5, and FIG. 10 is an enlarged sectional view taken along line XX in FIG.

  The illustrated electronic apparatus is a light source device mounted on the rear side of the liquid crystal display unit A in a thin television broadcast receiver having a liquid crystal display unit A having a substantially rectangular parallelepiped and having a display surface on the front side.

  This light source device includes a plurality of light emitting diodes 1 as light sources arranged side by side like a grid, the light emitting diodes 1 mounted on one surface, and a plurality of light emitting diode substrates 2 arranged in parallel in a plurality of rows. A plurality of connectors 3 that connect the matching light-emitting diode substrates 2 and 2, and a plurality of connectors 3 that are attached to one surface of the light-emitting diode substrate 2 and face the top of the light-emitting diode 1, and diverge the light emitted by the light-emitting diode 1. Lens 4, a reflection sheet 5 having a through-hole disposed in the lens 4, reflecting the light emitted from the lens 4 facing the one surface and one surface of the connector 3, and the light emitting diode substrate 2. Are arranged in a plurality of rows on one side, a grounding side member 6, a plurality of circuit boards 7 mounted on the other side of the grounding side member 6, and among the circuit boards 7, a terminal 8 for connecting an external device is provided. Fruit And a cover 9 for covering at least a portion of the terminal 8 of the circuit board being.

  The light emitting diode substrate 2 is formed in a strip shape having a circuit portion on one surface, and is arranged in parallel in a plurality of rows on one surface of a substantially rectangular grounding side member 6 separated in the length direction and the width direction, and each other surface is on one surface. The heat generated by each of the light-emitting diode substrates 2 can be released to the ground-side member 6. As shown in FIG. 3, a plurality of light-emitting diodes 1 are mounted on one surface of each light-emitting diode substrate 2 so as to be separated from each other in the length direction, and connection portions are provided at both ends in the length direction of the one surface.

  In the light emitting diode substrates 2 juxtaposed in a plurality of rows so that one end in the length direction is opposed to each other, the light emitting diode substrates 2 in each row are connected to each other by two connectors, and one light emitting diode substrate. The non-opposing side connection part of 2 is connected to a power circuit board described later by a second connector, and the non-opposing side connection part of the other light emitting diode substrate 2 is connected to a control circuit board described later by a third connector. .

  The grounding side member 6 is formed by forming a conductive iron plate, has a case shape having a flat plate portion 61 having a substantially rectangular shape and a frame portion connected to the periphery of the plate portion 61, and one surface 6 a of the plate portion 61. The light emitting diode substrate 2 is accommodated and supported in the length direction and the width direction.

  A plurality of mounting holes are formed at locations facing the cover 9 in the plate portion 61, and the peripheral edge portion of the cover 9 is attached to the mounting holes with male screws.

  The circuit board 7 is connected to one connection portion of the light emitting diode substrate 2 by a second connector, and supplies a voltage to an electronic component such as the light emitting diode 1 mounted on the light emitting diode substrate 2. A control circuit board for controlling electronic components, a control circuit board 71 for controlling the liquid crystal display part A, etc., which are connected to the other connection part of the light emitting diode substrate 2 by connectors, are substantially rectangular, It is arranged along the portion 61 on the other surface 6b side.

  The control circuit board 71 has a substantially rectangular shape, and a plurality of terminals 8 for connecting external devices are mounted on one side edge of the one surface 71a on which the electronic component 7a is mounted, separated in a direction along one side.

  The terminal 8 has a substantially rectangular parallelepiped shape having a female electrode portion 8a on one side, and the one surface 8b around the electrode portion 8a faces the control circuit board 71 so that the electrode portion 8a faces the edge on one side of the control circuit board 71. It is joined to one surface 71a. The connection port of the electrode part 8a is substantially rectangular.

  The cover 9 is formed by forming a conductive iron plate, covers the one surface 71a side of the control circuit board 71 on which the electronic component 7a and the terminal 8 are mounted, and forms a substantially rectangular wide plate portion 91, and the wide plate portion The four narrow plate portions 92 that are connected to the peripheral edge of the control circuit board 71 and face the peripheral surface of the control circuit board 71, and the four plate-like ridges that are bent outward from the tip of the narrow plate portion 92 and face the plate portion 61 And a support portion 94 that supports the control circuit board 71 in contact with the other surface 71 b of the control circuit board 71. A plurality of openings 95 facing the electrode portion 8 a of the terminal 8 are provided. The opening 95 is formed in a substantially square shape corresponding to the connection port of the electrode portion 8a.

  A plurality of contact portions 96 that are in contact with the other surface 8 c around the electrode portion 8 a of the terminal 8 and also serve as one side portion of each opening 95 are arranged in parallel on the terminal side edge portion of the wide plate portion 91. Each contact portion 96 has a substantially V-shaped cross-section in the thickness direction, and the top of the V-shape contacts the other surface 8 c around the electrode portion 8 a of the terminal 8. Slits 9a are provided on both sides in the longitudinal direction of each contact portion 96 so that each contact portion 96 is flexible. The terminal side edge portion of the wide plate portion 91 is biased in the thickness direction at the step portion 9b bent in the thickness direction, and the rigidity of the contact portion 96 is increased.

  The support part 94 is divided by a slit 9c in the width direction provided at the longitudinal ends of the narrow plate part 92 and the flange part 93, and is formed by bending a piece between the slits 9c inward. The support portion 94 is bonded to the other surface 71 b of the control circuit board 71, and the peripheral portion of the control circuit board 71 is held by the support portion 94.

  Through holes 9 d corresponding to the mounting holes of the plate portion 61 are formed on both ends in the longitudinal direction of the flange portion 93.

  In the light source device configured as described above, the cover 9 supporting the control circuit board 71 is placed on the other surface 6 b of the plate portion 61 of the ground side member 6, and the cover 9 is opened in the flange portion 93 of the cover 9. The cover 9 and the control circuit board 71 are attached to the grounding side member 6 by screwing the male screw into the attachment hole of the plate portion 61 from the through hole 9d. At this time, the support part 94 of the cover 9 for the terminal 8 supports the control circuit board 71, the contact part 96 contacts the other surface 8 c of the terminal 8, and the control circuit board 71 and the contact part 96 are contacted by the support part 94 and the contact part 96. Since the terminal 8 is swallowed, the contact portion 96 of the cover 9 can be stably brought into contact with the terminal 8 without being affected by the distortion or the like even when the grounding side member 6 is distorted or the like. EMI noise can be grounded to the ground side member 6 from the contact portion 96, the wide plate portion 91, the narrow plate portion 92, and the flange portion 93 of the cover 9. Moreover, since the control circuit board 71 and the terminal 8 are sandwiched by the support portion 94 and the contact portion 96, the positional relationship between the connection port of the electrode portion 8a and the opening 95 of the cover 9 is maintained, so-called off-center. Thus, the connecting / separating operation of the connecting tool that is inserted into and removed from the opening 95 and is brought into contact with and separated from the electrode portion 8a can be performed accurately.

  Since the cover 9 is a relatively inexpensive iron plate and the support portion 94 and the contact portion 96 of the cover 9 are integrally formed, the cost of the cover 9 and thus the cost of the electronic device including the cover 9 can be reduced.

Embodiment 2
FIG. 11 is an enlarged cross-sectional view showing another configuration of the cover portion of the electronic device according to the present invention. In this electronic device, the contact portion 96 is eliminated, and a concave ground portion 8d is provided at the connection port portion of the electrode portion 8a on the one surface 8b around the electrode portion 8a in the terminal 8, and the second ground portion 8d is in contact with the concave ground portion 8d. The contact portion 97 is integrally provided on the narrow plate portion 92 of the cover 9.

  The second contact portion 97 is bent inward in the thickness direction from the other side of each opening 95 in the narrow plate portion 92, and is inserted into the concave ground portion 8d.

In this light source device, the support portion 94 of the cover 9 supports the control circuit board 71, the second contact portion 97 contacts the concave ground portion 8 d of the one surface 8 b of the terminal 8, and the support portion 94 and the second contact portion 94. Since the control circuit board 71 is squeezed by the second contact portion 97, the second contact of the cover 9 is not affected by the distortion and the like even when the grounding side member 6 is distorted. The portion 97 can be brought into stable contact with the terminal 8, and EMI noise can be grounded to the ground side member 6 from the second contact portion 97, the narrow plate portion 92, and the flange portion 93 of the cover 9. Moreover, since the control circuit board 71 is sandwiched between the support portion 94 and the second contact portion 97, the positional relationship between the connection port of the electrode portion 8a and the opening 95 of the cover 9 can be maintained, and the opening The connecting / disconnecting operation of the connector that is inserted into and removed from the connector 95 and is connected to or separated from the electrode portion 8a can be performed accurately.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

Embodiment 3
FIG. 12 is an enlarged sectional view showing another configuration of the cover portion of the electronic device according to the present invention. In this electronic device, the cover 9 is provided with a contact portion 96 that contacts the other surface 8c of the terminal 8 and a second contact portion 97 that contacts the concave ground portion 8d of the one surface 8b.

  In this light source device, the support portion 94 of the cover 9 supports the control circuit board 71, the contact portions 96 and 97 are in contact with the terminals 8, and the control circuit board 71 is supported by the support portion 94 and the contact portions 96 and 97. Since the terminal 8 is swallowed, the contact portions 96 and 97 of the cover 9 are brought into stable contact with the terminal 8 without being affected by the distortion or the like even when the grounding side member 6 is distorted or the like. be able to. Moreover, a system for grounding the EMI noise from the contact portion 96, the wide plate portion 91, the narrow plate portion 92, and the flange portion 93 of the cover 9 to the ground side member, and the second contact portion 97, the narrow plate portion 92, and the flange portion. 93 can be grounded from the two systems grounded to the grounding side member 6, and the contact area with the terminal 8 of the cover 9 can be increased. Even if the circuit board 7 such as the control circuit board 71 and the cover 9 become large, EMI noise can be grounded efficiently.

As described above, the contact portions 96 and 97 in the case of grounding from the two systems have a structure in contact with the one surface 8b and the other surface 8c of the substantially rectangular terminal 8, and the side surface between the one surface 8b and the other surface 8c. The structure which contacts may be sufficient and the contact location in particular is not restrict | limited.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

  In the embodiment described above, the cover 9 is provided to cover the control circuit board 71 on which the terminal 8 having the female electrode portion 8a is mounted together with the terminal portion. The cover 9 may be configured to cover the control circuit board 71 on which the terminal 8 having the portion 8a is mounted together with the terminal portion.

  In the embodiment described above, the cover 9 is provided to cover the circuit board together with the terminal portion. However, the cover 9 is sized to cover only the terminal portion of the circuit board on which the terminals are mounted. It is good. In this case, the cover may cover the other surface of the terminal and the periphery of the connection port, and may have at least one of the contact portions 96 and 97 and the support portion 94. The structure which has at least one of the parts 96 and 97 and the support part 94 may be sufficient.

  In the embodiment described above, the contact portion 96 that contacts one surface of the substantially rectangular terminal 8 and the second contact portion 97 that contacts the other surface are provided. The structure which does not have the contact part 97 but has only the contact part 96 may be sufficient. Moreover, the 2nd contact part 97 is good also as a structure which contacts the side surface between one surface and another surface instead of contacting another surface.

  The electronic device according to the present invention may be the television broadcast receiver in addition to a light source device provided in a television broadcast receiver such as a liquid crystal television provided with a receiver for receiving a television broadcast signal. Further, it may be a video display device such as a personal computer without a receiving unit.

6 Grounding side member 7 Circuit board 7a Electronic component 71 Control circuit board 8 Terminal 8a Electrode portion 9 Cover 91 Wide plate portion 92 Narrow plate portion 94 Support portion 95 Opening 96 Contact portion 97 Second contact portion

Claims (7)

  In an electronic apparatus including a conductive cover that covers a terminal on a circuit board on which an electronic component is mounted, the cover includes a support part that supports the circuit board and a contact part that contacts an outer surface of the terminal. Features electronic equipment.   The electronic device according to claim 1, wherein the support portion is disposed at least on a side where the terminals are mounted.   The electronic device according to claim 1, wherein the support portion and the contact portion are integrally formed.   The electronic device according to any one of claims 1 to 3, wherein the cover includes a second contact portion that contacts the outer surface at a position separated from a position where the contact portion contacts.   The terminal is arranged so that an electrode portion faces an edge of the circuit board, and the cover is connected to a wide plate portion facing one surface of the circuit board and an edge of the wide plate portion, 5. The electronic device according to claim 1, further comprising a narrow plate portion facing the peripheral surface, wherein the narrow plate portion has an opening facing the electrode portion of the terminal.   6. A video display device comprising: a display unit having a video display surface; and a grounding side member to which the cover is attached, and including the electronic device according to claim 1.   The video display apparatus according to claim 6, further comprising: a reception unit that receives a television broadcast signal, wherein the reception unit receives the television broadcast signal and displays a television image on a video display surface of the display unit. TV broadcast receiver.

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