JP2007328948A - Electric equipment and conductor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductor which is easy to install on and detach from a chassis provided in an electric equipment and can reduce an output of a spurious radiation and assembly and disassembly of the electric equipment, and an electric equipment having the conductor. <P>SOLUTION: Locking holes 2b, 2b are provided at a chassis unit 2 provided in a liquid crystal display device and the projection parts provided in a conductor 3 are locked to the locking holes 2b, 2b, and the conductor 3 is installed between the chassis unit 2 and a backlight chassis 4, whereby, the chassis unit 2 and the backlight chassis 4 are electrically connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a conductor that reduces the output of unnecessary radiation generated on a circuit board and facilitates assembly and disassembly of an electric device, and an electric device including the electric conductor.

  A loop circuit that functions as a loop antenna by combining a circuit connected to a load side that takes in a signal from a transmission side that transmits a signal and a circuit that returns from the load side on a circuit board provided in the electrical equipment May be configured. When a current flows through another circuit and a noise current flows through the loop circuit due to mutual induction, unnecessary radiation is generated from the loop circuit. Depending on the output of the generated unwanted radiation, the electric device may malfunction, so it is necessary to reduce the output of the unwanted radiation. For this purpose, it is necessary to reduce the noise current flowing in the circuit board.

  In the conventional electric device, the conductor is caulked to the grounded chassis plate, and the circuit board and the chassis plate facing the chassis board are screwed to each other so that the circuit board and the chassis are interposed via the conductor. The boards are electrically connected, and the noise current flowing through the circuit board is passed through the chassis board into the ground to reduce the noise current (see Patent Document 1).

Further, conventionally, a conductor is attached to a chassis provided with a circuit board with screws, a grounded chassis is opposed to the chassis provided with the circuit board, and is brought into contact with the conductor. There is an electric device that reduces the noise current by electrically connecting a chassis provided with a circuit board and a chassis to be grounded to flow a noise current flowing through the circuit board into the ground.
In addition, a conductive gasket is attached to the chassis on which the circuit board is provided and the chassis to be grounded using double-sided tape, and both the chassis are electrically connected to cause noise current flowing in the circuit board to flow into the ground. There are electrical devices that reduce noise current.
JP 2003-79893 A

  In the electric device described in Patent Document 1, one of the conductors is attached to the chassis plate by caulking, but the caulking is more complicated than the installation of screws and fitting. For this reason, it takes a long time to assemble the electric equipment, resulting in a decrease in the efficiency of the assembly work. Also, releasing the caulking stops requires a greater force compared to removing the screw and releasing the fitting. For example, it takes a long time to disassemble the electrical equipment for the purpose of recycling electrical equipment parts. And lowering the efficiency of the dismantling work.

In the electrical equipment in which the conductor is attached to the chassis provided with the circuit board with screws, and the chassis provided with the circuit board and the chassis to be grounded are electrically connected. Pressure concentrates on the screwed part, the conductor is deformed, a gap is formed between the conductor and the grounded chassis, the contact resistance between the conductor and the grounded chassis is increased, noise current Does not flow into the ground, the noise current generated in the circuit board increases, the output of unnecessary radiation increases, and there is a risk of causing malfunction of the electrical equipment.
In addition, the conductive gasket is attached to the chassis on which the circuit board is provided and the chassis to be grounded using the double-sided tape, but the gasket is more expensive than a metal conductor, The manufacturing cost of electrical equipment increases. Depending on the level of adhesive strength of the adhesive used in the double-sided tape, it may take a long time to disassemble the electrical device for the purpose of recycling the components of the electrical device, for example. When the gasket is attached between the chassis on which the circuit board is provided and the chassis to be grounded, the double-sided tape is used, but when the double-sided tape is peeled off, the chassis on which the circuit board is provided or grounded. The contact resistance between the chassis and the gasket increases, noise current does not flow into the ground, the noise current generated in the circuit board increases, and the output of unnecessary radiation may increase, leading to malfunction of electrical equipment. there were.

  The present invention has been made in view of such circumstances, and is intended to lock a conductor on at least one of the opposing surfaces of the first chassis to be grounded and the second chassis provided with the circuit board. By providing the locking hole, the electric conductor can be easily attached to the first or second chassis and can be easily detached from the first or second chassis. It is an object of the present invention to provide an electrical device that can efficiently perform assembly and disassembly by reducing the time required for assembly and disassembly work.

  Further, the first and second chassis and the elastic portion provided on the conductor are brought into contact with each other to electrically connect the first and second chassis via the conductor, It is an object of the present invention to provide an electric device that can cause noise current generated in a circuit board to flow through the first chassis into the ground to reduce the output of unnecessary radiation and prevent malfunction of the electric device.

  Further, by providing a protruding portion that bends and protrudes at the side edge of the frame of the conductor, for example, a hole is opened in the chassis on which the circuit board is provided or the grounded chassis, and the protruding portion is used as the hole. The conductor is provided between the chassis on which the circuit board is provided and the chassis to be grounded, and the chassis on which the circuit board is provided and the chassis to be grounded are electrically connected via the conductor. Provided is a conductor that can be connected to cause noise current generated in the circuit board to flow through the grounded chassis to the ground, thereby reducing the output of unwanted radiation and preventing malfunction of electrical equipment. With the goal.

  Further, by providing one or a plurality of holes in the plate spring portion of the conductor, the bending of the plate spring with respect to the load is increased, and for example, the conductive layer is provided between a chassis provided with a circuit board and a grounded chassis. An object of the present invention is to provide a conductor capable of efficiently assembling an electric device by bending the leaf spring with a small load when assembling the electric device with a body.

  Also, by forming a part of the leaf spring of the conductor into a mountain shape projecting on both sides, for example, the conductor is provided between the chassis on which the circuit board is provided and the chassis to be grounded. The chevron-shaped portion of the circuit board is brought into contact with the chassis on which the circuit board is provided and the chassis to be grounded, and the chassis on which the circuit board is provided and the chassis to be grounded are electrically connected via the conductor, It is an object of the present invention to provide a conductor that can cause noise current generated in a circuit board to flow through the grounded chassis into the ground to reduce the output of unwanted radiation and prevent malfunction of electrical equipment.

  An electrical apparatus according to the present invention includes a first chassis that is grounded, a second chassis that is opposed to the first chassis and has a circuit board, and the first and second chassis. An electrical apparatus comprising a conductor in contact with the first and second chassis, the conductor being provided on at least one of the surfaces facing each of the first and second chassis. And the first and second chassis are electrically connected to each other through the conductor.

  In the present invention, the first or second chassis is provided with the locking hole for locking the conductor on at least one of the opposing surfaces of the first and second chassis. The conductor is easily attached and the conductor is easily removed from the first or second chassis. In addition, the first and second chassis are electrically connected via the conductor, and a noise current generated in a circuit board provided in the second chassis is generated via the conductor. To reduce the output of unnecessary radiation generated in the circuit board.

  In the electrical device according to the present invention, the conductor includes an elastic portion, and the elastic portion is in contact with the first and second chassis.

  In the present invention, the elastic portion is pressed by bringing the first and second chassis and the elastic portion provided in the conductor into contact, and the elastic portion reacts with the first and second elastic portions. The conductor is pressed against the first and second chassis by pressing the chassis. The first and second chassis are electrically connected via the conductor, and a noise current generated in a circuit board provided in the second chassis is transmitted to the first chassis via the conductor. Through the earth, reducing the output of unwanted radiation generated in the circuit board.

  The conductor according to the present invention is a conductor including a frame and a leaf spring extending from the inner edge of the frame to the inside of the frame, and bends and protrudes at a side end of the frame. It has the projection part which is provided.

  In the present invention, by providing a protruding portion that bends and protrudes at the side edge of the conductor frame, for example, a hole is opened in the chassis on which the circuit board is provided or the grounded chassis, and the protruding portion is provided. The conductor is provided between the chassis provided with the circuit board and the chassis to be grounded, and the chassis provided with the circuit board and the chassis to be grounded via the conductor. The noise current generated in the circuit board is caused to flow into the ground through the grounded chassis to reduce the output of unnecessary radiation.

  Moreover, the conductor according to the present invention is characterized in that the leaf spring includes one or a plurality of holes.

  In the present invention, by providing one or a plurality of holes in the leaf spring portion of the conductor, the deflection of the leaf spring with respect to the load is increased, for example, between the chassis on which the circuit board is provided and the chassis to be grounded. The plate spring is bent with a small load when the electric conductor is provided in the assembly of the electrical equipment.

  The conductor according to the present invention is characterized in that the leaf spring has a chevron shape partially protruding from both sides.

  In the present invention, by forming a part of the leaf spring into a chevron shape projecting on both sides, for example, the conductor is provided between a chassis on which a circuit board is provided and a chassis to be grounded. A chevron-shaped portion of the body is brought into contact with the chassis on which the circuit board is provided and the chassis to be grounded, and the chassis on which the circuit board is provided and the chassis to be grounded are electrically connected via the conductor, Noise current generated in the circuit board is passed through the grounded chassis to the ground to reduce the output of unwanted radiation.

  In the electrical device according to the present invention, a locking hole for locking the conductor is provided on at least one of the opposing surfaces of the first chassis to be grounded and the second chassis on which the circuit board is provided. Thus, the conductor can be easily locked to the first or second chassis by locking the conductor in the locking hole, and the conductor can be removed from the locking hole, and the first The conductor can be easily removed from the first or second chassis. Therefore, the time required for assembly and disassembly of the electric equipment can be shortened, and assembly and disassembly can be performed efficiently. Further, since the first and second chassis are electrically connected via the conductor, noise current generated in the circuit board provided in the second chassis is grounded through the grounded first chassis. It is possible to reduce the output of unwanted radiation and prevent malfunction of electrical equipment.

  In the present invention, the elastic portion is pressed by bringing the first and second chassis into contact with the elastic portion provided on the conductor, and the elastic portion is reacted with the first and second elastic portions. The second chassis is pressed to contact the conductor and the first and second chassis. Therefore, since the first and second chassis are electrically connected via the conductor, noise current generated in the circuit board provided in the second chassis is grounded through the grounded first chassis. The output of unnecessary radiation is reduced, and malfunction of electrical equipment can be prevented.

  Further, in the present invention, by providing a protruding portion that bends and protrudes at the side end of the conductor frame, for example, a hole is formed in the chassis on which the circuit board is provided or the grounded chassis. The conductor is provided between the chassis on which the circuit board is provided and the chassis to be grounded, and the chassis on which the circuit board is provided and the chassis to be grounded are connected to the conductor. Therefore, the noise current generated in the circuit board can be passed through the grounded chassis to the ground, and the output of unnecessary radiation can be reduced to prevent malfunction of the electric device.

  Further, in the present invention, by providing one or a plurality of holes in the leaf spring portion of the conductor, the deflection of the leaf spring with respect to the load is increased. For example, the chassis provided with the circuit board and the chassis grounded When assembling an electric device with the conductor provided between the two, the leaf spring bends with a small load, and the conductor is easily sandwiched between the chassis on which the circuit board is provided and the grounded chassis. Therefore, it is possible to improve the efficiency of assembly of the electric device and reduce the manufacturing cost of the electric device.

  In the present invention, the conductor is provided between the chassis on which the circuit board is provided and the chassis to be grounded, for example, by providing a part of the leaf spring of the conductor with a mountain shape protruding on both sides. Then, the mountain shape of the conductor is brought into contact with the chassis on which the circuit board is provided and the chassis to be grounded, and the chassis on which the circuit board is provided and the chassis to be grounded are electrically connected via the conductor. Since the connection is made, the noise current generated in the circuit board can be passed through the grounded chassis to the ground, and the output of unnecessary radiation can be reduced.

  Hereinafter, an electric device and a conductor according to the present invention will be described in detail with reference to the drawings illustrating embodiments. FIG. 1 is an external view of a liquid crystal display device according to the embodiment, FIG. 2 is a schematic perspective exploded view of a main part of the liquid crystal display device according to the embodiment, and FIG. 3 is a chassis unit of the liquid crystal display device according to the embodiment. FIG.

  In the figure, reference numeral 1 denotes a housing that encloses the liquid crystal display device, and includes a rectangular back surface that is long in the left-right direction, and upper and lower surface portions and left and right side surfaces that are connected to the periphery of the back surface portion. A rectangular liquid crystal display panel 5 is supported and fixed inside the housing 1, and a rectangular frame 6 is fitted to the front surface of the housing 1.

  On the back side of the liquid crystal display panel 5, a backlight chassis 4 that supports the cold cathode fluorescent tube 40 is disposed. The backlight chassis 4 includes a rectangular back surface that is long in the left-right direction, and upper and lower surface portions and left and right side surfaces that are connected to the periphery of the back surface portion, and the front surface is open to a size corresponding to the liquid crystal display panel 5. In the vicinity of the center of the back surface portion of the backlight chassis 4, screw holes 4 a, 4 a. A circuit board 41 having a drive circuit is provided on the back surface of the backlight chassis 4 along the edge of the left side surface portion. A box-shaped chassis unit 2 having a power circuit (not shown) is disposed on the back side of the backlight chassis 4, and a conductor 3 is disposed between the chassis unit 2 and the backlight chassis 4. ing.

  The chassis unit 2 includes a rectangular front part that is long in the left-right direction, and upper and lower surface parts and left and right side parts that rise from the periphery of the front part in the back direction. At the center of the front portion in the vertical direction, raised portions 2c and 2c that are raised to the backlight chassis 4 side by press working are juxtaposed in the left-right direction. The raised portions 2c and 2c are truncated elliptical cones whose front shape facing the backlight chassis 4 is a substantially elliptical shape that is long in the vertical direction, and a locking hole is formed on each front surface of the raised portions 2c and 2c. 2b and 2b are spaced apart in the vertical direction. In the vicinity of the upper and lower surface portions of the front portion of the chassis unit 2, screw insertion holes 2a, 2a,... Corresponding to the screw holes 4a, 4a,.

  FIG. 4 is a perspective view showing the conductor 3 of the liquid crystal display device according to the embodiment. The conductor 3 includes a rectangular plate-shaped frame portion 3a having two substantially square frame holes, and a side end perpendicular to the longitudinal direction of the frame portion 3a is arranged in one direction perpendicular to the frame portion 3a. Protrusions 3b and 3b, which are bent and project and have a V-shaped cross section in a direction perpendicular to the longitudinal direction of the frame 3a, are provided. When the protrusions 3b and 3b are inserted into the locking holes 2b and 2b, the V-shaped width becomes narrower and is locked by an elastic restoring force.

  The leaf springs 30 and 30 are provided integrally with the frame portion 3a so as to extend in the same direction from one edge of the frame hole perpendicular to the longitudinal direction of the frame portion 3a to the inside of the frame hole. An inclined portion 31 that is inclined in the other direction perpendicular to the frame portion 3a from the edge of the frame hole is provided. In the inclined portion 31, slits 32, 32,... Are juxtaposed in a direction perpendicular to the longitudinal direction of the frame portion 3a. An angled portion 33 that is integrated with the inclined portion 31 and has two angled shapes formed by bending extends in the longitudinal direction of the frame portion 3a. The two chevron shapes of the chevron 33 are raised in two directions perpendicular to the frame part 3a.

  FIG. 5 is a schematic enlarged side sectional view of the liquid crystal display device according to the embodiment. The raised portion 2c of the chassis unit 2 is provided with locking holes 2b and 2b, the protrusions 3b and 3b provided in the conductor 3 are locked to the locking holes 2b and 2b, and the conductor 3 is the chassis unit. 2 is locked. .. Are inserted into the screw insertion holes 2a, 2a,... Provided in the chassis unit 2, and the screws 20, 20,... Are inserted into the screw insertion holes 2a, 2a,. Are screwed into the screw holes 4a, 4a,... Corresponding to the chassis unit 2, the conductor 3, and the back in a state in which the chevron 33 of the conductor 3 is in contact with the chassis unit 2 and the backlight chassis 4, respectively. The light chassis 4 is fixed tightly. A substantially rectangular parallelepiped inlet 7 connected to an external power source is attached to the lower surface of the chassis unit 2, and the inlet 7 includes a ground terminal.

  By providing locking holes 2b and 2b for locking the conductor 3 in the raised portion 2c of the chassis unit 2, the protrusions 3b and 3b provided in the conductor 3 are formed in the locking holes 2b and 2b. Since the protrusions 3b, 3b are locked to the locking holes 2b, 2b by insertion and elastic restoring force, the conductor 3 can be easily locked to the chassis unit 2, and the locking holes 2b, It is possible to easily remove the conductor 3 from the chassis unit 2 by removing the protrusions 3b and 3b from 2b.

  The conductor 3 is in contact with the chassis unit 2 and the backlight chassis 4, and the noise current generated in the circuit board 41 attached to the backlight chassis 4 passes through the conductor 3 to the chassis unit 2. Flowing. The noise current that has flowed through the chassis unit 2 is caused to flow into the ground through the inlet 7, and the output of unnecessary radiation generated at the circuit board 41 is reduced.

  By providing a protruding portion 3b that is bent and protrudes at the side end of the frame body of the conductor 3, a locking hole 2b is opened in the chassis unit 2, and the protruding portion 3b is locked to the locking hole 2b. The conductor 3 is provided between the chassis unit 2 and the backlight chassis 4, and the chassis unit 2 and the backlight chassis 4 are electrically connected via the conductor 3 to be generated on the circuit board 41. A noise current is passed through the chassis unit 2 and the inlet 7 to the ground to reduce the output of unnecessary radiation.

  By providing a plurality of slits 32, 32,... In the inclined portion 31 of the leaf spring 30, the deflection of the leaf spring 30 with respect to the load is increased, and the backlight chassis 4 provided with the circuit board 41 is grounded. When the liquid crystal display device is assembled with the conductor 3 sandwiched between the chassis units 2, the leaf spring 30 bends with a small load, and the conductors are easily interposed between the backlight chassis 4 and the chassis unit 2. 3 can be sandwiched.

  By providing the leaf springs 30 provided on the conductor 3 with the chevron portions 33 and 33 projecting on both sides, the conductor 3 is placed between the grounded chassis unit 2 and the backlight chassis 4 on which the circuit board 41 is provided. And the mountain-shaped portions 33 and 33 of the conductor 3 are brought into contact with the chassis unit 2 and the backlight chassis 4.

  By providing locking holes 2b and 2b for locking the conductor 3 in the raised portion 2c of the chassis unit 2, the protrusions 3b and 3b provided in the conductor 3 are formed in the locking holes 2b and 2b. Since the protrusions 3b, 3b are locked to the locking holes 2b, 2b by insertion and elastic restoring force, the conductor 3 can be easily locked to the chassis unit 2, and the locking holes 2b, It is possible to easily remove the conductor 3 from the chassis unit 2 by removing the protrusions 3b and 3b from 2b, so that the time required for the assembly and disassembly of the liquid crystal display device can be shortened. In addition, the liquid crystal display device can be assembled and disassembled.

  The leaf spring 30 is pressed by bringing the chassis unit 2 and backlight chassis 4 and the leaf spring 30 provided on the conductor 3 into contact with each other, and the leaf spring 30 reacts with the chassis unit 2 and the backlight. The chassis 3 is pressed to bring the conductor 3 into contact with the chassis unit 2 and the backlight chassis 4. Therefore, since the chassis unit 2 and the backlight chassis 4 are electrically connected via the conductor 3, the noise current generated in the circuit board 41 provided in the backlight chassis 4 is reduced to the grounded chassis unit 2. And it can flow into the ground through the inlet 7 to reduce the output of unnecessary radiation and prevent malfunction of the liquid crystal display device.

  By providing a protruding portion 3b that is bent and protrudes at the side end of the frame body of the conductor 3, a locking hole 2b is opened in the chassis unit 2, and the protruding portion 3b is locked to the locking hole 2b. Generated on the circuit board 41 by providing the conductor 3 between the chassis unit 2 and the backlight chassis 4 and electrically connecting the chassis unit 2 and the backlight chassis 4 via the conductor 3 Noise current flowing through the chassis unit 2 and the inlet 7 into the ground can reduce the output of unwanted radiation, and prevent malfunction of the liquid crystal display device.

  By providing a plurality of slits 32, 32,... In the inclined portion 31 of the leaf spring 30, the deflection of the leaf spring 30 with respect to the load is increased, and the conductor 3 is interposed between the backlight chassis 4 and the chassis unit 2. When the liquid crystal display device is assembled by providing the plate spring 30 with a small load, the conductor 3 can be easily sandwiched between the backlight chassis 4 and the chassis unit 2. The efficiency of assembly of the display device can be improved, and the manufacturing cost of the liquid crystal display device can be reduced.

  The conductor 3 is provided between the chassis unit 2 and the backlight chassis 4 on which the circuit board 41 is provided by providing the leaf springs 30 provided on the conductor 3 with the chevron portions 33 and 33 projecting on both sides. The chevron 33, 33 of the conductor 3 is brought into contact with the chassis unit 2 and the backlight chassis 4, and the backlight chassis 4 and the chassis unit 2 are electrically connected via the conductor 3. A noise current generated in the circuit board 41 is caused to flow into the ground through the chassis unit 2 and the inlet 7 to reduce the output of unnecessary radiation and prevent the liquid crystal display device from malfunctioning.

  In addition, although two leaf springs 30 are provided in the conductor 3 according to the embodiment, the number of the leaf springs 30 may be one, or may be three or more. Moreover, it is good also as a structure which provides a latching hole in the backlight chassis 4, and the protrusion part 3b latches in the said latching hole. Moreover, as a material used for the conductor 3, a stainless steel strip for a spring is mentioned.

  In addition, the electrical device according to the present invention is not limited to the liquid crystal display device according to the embodiment, and a conductor is in contact with a lamp unit used in a liquid crystal projector, an overhead projector, etc., and has the same configuration as the present invention. It may be a projector device. Further, the conductor according to the present invention may be used for an electric device such as a hard disk drive.

1 is an external view of a liquid crystal display device according to an embodiment. 1 is a schematic perspective exploded view of a main part of a liquid crystal display device according to an embodiment. It is a schematic perspective view of the chassis unit of the liquid crystal display device according to the embodiment. It is a perspective view which shows the conductor of the liquid crystal display device which concerns on embodiment. 1 is a schematic enlarged side sectional view of a liquid crystal display device according to an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Chassis unit 2a Screw insertion hole 2b Locking hole 3 Conductor 3b Projection part 4 Backlight chassis 5 Liquid crystal display panel 6 Frame 4a Screw hole 20 Screw 30 Leaf spring 32 Slit 33 Mountain part

Claims (5)

A first chassis to be grounded; a second chassis facing the first chassis and provided with a circuit board; and provided between the first and second chassis. In an electrical device comprising a conductor in contact with two chassis,
The first and second chassis are provided on at least one of the surfaces facing the first chassis and the second chassis has a locking hole for locking the conductor, and the first conductor is locked in the locking hole. And an electrical device wherein the second chassis is electrically connected via the conductor.   The electrical apparatus according to claim 1, wherein the conductor includes an elastic portion, and the elastic portion is in contact with the first and second chassis.   A conductor comprising a frame and a leaf spring extending from the inner edge of the frame to the inside of the frame, wherein the conductor includes a protrusion that bends and protrudes at a side end of the frame. Conductor.   The conductor according to claim 3, wherein the leaf spring includes one or a plurality of holes.   5. The conductor according to claim 3, wherein the leaf spring has a chevron shape partially protruding from both sides.

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