CN101383470A - socket for cathode tube - Google Patents

Abstract

The invention relates to a socket for a cathode tube. Its object is to provide a socket for a cathode tube that prevents a load from being applied to the cathode tube even if a difference in expansion occurs due to heat generation of the cathode tube. The cathode tube socket of the present invention is used to electrically connect the cathode tube to one side of the power supply, and is characterized in that it has: a base installed on one side of the power supply and a bracket for assembling the cathode tube, and is arranged to span from the base to the bracket The elastic connection contact; the bracket is made to slide freely along the length direction of the assembled cathode tube relative to the base; the elastic connection contact has an elastic arm electrically connected to the cathode tube terminal in the bracket and electrically connected to the power supply side in the base The connected elastic connecting piece; the elastic arm and the elastic connecting piece are connected by an elastically deformable elastic deformation part.

Description

socket for cathode tube

technical field

The invention relates to a socket for a cathode tube, and is particularly suitable for a socket for a cold cathode tube used in the backlight of a liquid crystal display device such as a liquid crystal television.

Background technique

As a method of connecting a cold cathode tube (cold cathode fluorescent lamp-Cold Cathode Fluorescent Lamp: CCFL tube) with a lead part to a power supply, as shown in FIG. The method of connecting the electric wires 103 to the power supply after installing the cold cathode tube 101 on the fixing member is poor in work efficiency for wiring and connecting the electric wires on the assembled fixing member.

In Patent Document 1 - Japanese Patent Laid-Open No. 2007-165208, a connector for elastically clamping the lead part is disclosed. When there is a relative expansion difference between the circuit board or the base plate, the contact part between the lead part and the connector will deviate, the connection will become unstable, and a load will be placed on the sealing part between the glass tube and the lead part, and the sealing gas will be damaged. Risk of leakage.

Contents of the invention

In view of the above technical problems, the present invention aims to provide a socket for cathode tubes that prevents a load from being applied to the cathode tubes even if a difference in expansion occurs due to heat generation of the cathode tubes.

The cathode tube socket of the first aspect of the present invention is used to electrically connect the cathode tube to one side of the power supply, and is characterized in that it has a base installed on one side of the power supply and a bracket for assembling the cathode tube, and is arranged to span from the base to The elastic connection contact of the support; the support is made to freely slide along the length direction of the assembled cathode tube relative to the base; the elastic connection contact has an elastic arm electrically connected with the cathode tube terminal in the support and a power supply in the base The elastic connecting piece electrically connected to the side; the elastic arm and the elastic connecting piece are connected by an elastically deformable elastic deformation part.

The gist of the present invention is to enable the bracket to slide freely relative to the base, and to enable the bracket to move elastically relative to the base by connecting the bracket and the base with elastically deformable elastic connecting contacts.

Although this socket is particularly suitable for cold-cathode tubes provided with terminals connected by elastic contacts, it is not limited to cold-cathode tubes, and can also be used for fluorescent tubes (electron tubes) such as External Electrode Fluorescent Lamps (EEFL). socket.

In addition, the base installed on the side of the power supply can connect the elastic connecting contacts to the terminals on the side of the power supply, can also be installed on the circuit board, and can also be installed on the bottom plate or other electrical components.

The cathode tube socket according to the second aspect of the present invention is characterized in that the elastic deformation portion of the elastic connection contact is folded back so that strip-shaped elastic pieces are alternately overlapped.

In the present invention, although the elastic deformation part only needs to have the effect of absorbing the relative position deviation of the elastic arm connected to the cathode tube terminal and the elastic connecting piece electrically connected to the power supply side of the circuit terminal provided on the circuit board, etc. However, the structure is not particularly limited, but if the belt-shaped elastic pieces are alternately folded back according to the second aspect of the present invention, the amount of elastic deformation increases and the durability is also excellent.

The socket for the cathode tube of the third aspect of the present invention is characterized in that a pair of elastic arms arranged in the bracket for applying elastic force are formed by clamping the cathode tube terminal from both sides, and the bracket is equipped with a pair of opening and closing brackets. The elastic arm is spaced from the cover of the cam arm.

The elastic connection contact makes the elastic contact piece elastically contact and connect with the circuit terminal on the side of the power supply provided on the circuit board, etc., and connects the elastic arm with the terminal of the cathode tube elastically, so that the cold cathode tube and the cathode tube are realized without brazing The electrical connection of the circuit on the side of the power supply.

The point is that opening and closing a pair of elastic arms spaced apart covers enables the cathode tube terminals to be mounted without load.

In addition, the elastic connecting contact is integrally made of the elastic arm, the elastic deformation part and the elastic connecting piece with one metal plate.

In the cathode tube socket of the present invention, by freely sliding between the bracket for assembling the end of the cathode tube and the base installed on the circuit board as the power supply side, the bracket and the base are connected with elastic elastic connecting contacts. , the structure of connecting the elastic connecting contacts with the cathode tube terminals and the circuit board respectively can use the elastic sliding movement between the bracket and the base to absorb the zero loss caused by the heating of the cathode tube in the cathode tube and the assembly of the cathode tube The relative stretch difference that occurs between components.

Therefore, the load applied to the cathode tube can be suppressed, and damage to the glass tube of the cathode tube can be prevented.

In addition, it is possible to prevent the connection between the elastic connection contact and the cathode tube from slipping due to the difference in expansion and contraction, thus making the connection unstable.

Therefore, it is particularly suitable for sockets for cold-cathode tubes used in the backlight of large-scale LCD TVs using cold-cathode tubes with long dimensions and large thermal expansion coefficients. Leakage between the lead seal and the lead portion on the glass tube of the tube.

The elastic connection contact is integrally produced by bending the elastic metal plate, and the socket can be easily configured and the cost can be reduced.

If the elastic connecting contact is electrically connected with the circuit board terminal and the cathode tube terminal through the elastic contact, the socket assembly can be performed without brazing and the end of the cathode tube can be installed on the socket.

Therefore, it is particularly suitable as a socket for cold-cathode tubes for direct-type backlights of liquid crystal televisions that require mounting of a plurality of cold-cathode tubes.

If a cover having a cam arm that opens and closes the gap between a pair of elastic arms is provided, the elastic arm can be made to stand by in a flexed state to accommodate the cathode tube terminal in the bracket, and after accommodating the cathode tube terminal in the bracket The elastic arm is elastically reset to realize electrical connection.

Thereby, the cold-cathode tube end can be attached to the bracket and connected without applying a load to the cold-cathode tube terminal.

In addition, since the end of the cold-cathode tube can be put into the socket without load, and the terminal of the cold-cathode tube can be connected by pressing the cover, automation of assembly can be easily realized.

Description of drawings

Fig. 1 is a diagram showing an embodiment of a socket for a cathode tube according to the present invention, Fig. 1(a) is a perspective explanatory view, and Fig. 1(b) is a longitudinal sectional view.

Fig. 2 is an explanatory diagram showing a socket with a cover attached, Fig. 2(a) is a perspective view, Fig. 2(b) is a front view, and Fig. 2(c) is a rear view.

Fig. 3 is an explanatory view showing a state in which the bracket elastically moves relative to the base.

Fig. 4 is an exploded view showing the socket.

Fig. 5 is an explanatory view showing a state in which the end of the cold cathode tube is attached to the socket.

6( a ) is a front view showing the cover, FIG. 6( b ) is a front view showing the elastic connecting contact, and FIG. 6( c ) is a cross-sectional view along line C-C in FIG. 6( b ).

Fig. 7 (a) is a sectional view corresponding to the line A-A of Fig. 1 (b) showing that the cover is half installed, and Fig. 7 (b) is a sectional view corresponding to the B-B line of Fig. 1 (b) showing that the cover is half installed, Fig. 7 (c) is a sectional view corresponding to the A-A line of Fig. 1 (b) showing that the cover is fully installed, and Fig. 7 (d) is a sectional view corresponding to the B-B line of Fig. 1 (b) showing that the cover is fully installed.

Fig. 8 is an explanatory view showing the state where the end of the cold cathode tube is installed on the socket, Fig. 8(a) is a cross-sectional view corresponding to line A-A of Fig. 1(b) showing that the cover is half installed, and Fig. 8(b) It is a sectional view corresponding to the B-B line of Fig. 1(b) showing that the cover is half installed, and Fig. 8(c) is a sectional view corresponding to the A-A line of Fig. 1(b) showing that the cover is fully installed, and Fig. 8(d) It is a cross-sectional view corresponding to line B-B in FIG. 1( b ) showing that the cover is fully installed.

Fig. 9 is an explanatory diagram showing a state in which the socket is mounted on a circuit board.

Fig. 10 shows a modified example of the elastic connection contact.

Fig. 11 shows a prior art example.

In the figure: 1-cold cathode tube, 2-cold cathode tube end, 3-lead part (cold cathode tube terminal), 4-circuit board, 4a-circuit board end, 5-cut groove, 5a-circuit board cut The recess of the groove, 10-socket for cold cathode tube, 20-bracket, 21-tube end support part, 22-lead wire groove, 23-clamp body accommodation chamber, 23a-press-in groove, 24-cover guide piece, 24a- Locking part, 25-insert convex part, 30-elastic connection contact, 31-clamp body, 32-bracket installation part, 33-press-in piece, 34-elastic arm, 35-connecting part, 36-cam supporting part , 37-elastic deformation part, 38-circuit board mounting body, 38a-installation base, 39-elastic connecting piece, 40-base, 41-guiding groove, 42-spring displacement space, 43-circuit board insertion chamber, 44 -Guide piece, 45-circuit board locking arm, 45a-claw of circuit board locking arm, 46-circuit board mounting body accommodation chamber, 46a-pressing groove, 50-cover, 51-top plate part, 52-insertion part , 53-semi-installation claw, 54-full installation claw, 55-cam arm, 56-cam part, 57-lead support groove, 60-socket, 61-elastic connection contact, 61a-elastic connection piece.

Detailed ways

FIG. 1 shows an embodiment in which the socket structure for a cathode tube of the present invention is applied to a socket for connecting a cold cathode tube having a lead portion to a circuit board.

FIG. 1( a ) is a perspective explanatory view showing a socket, and FIG. 1( b ) is a longitudinal sectional view.

In addition, FIG. 4 shows an exploded view.

The socket 10 has: a base 40 installed on the circuit board; a bracket 20 for assembling the end of the cold cathode tube;

A guide groove 41 along the installation direction of the cold cathode tube is formed on the upper part of the base 40, and an insertion protrusion 25 corresponding to the guide groove 41 of the base 40 is provided on the lower part of the bracket 20, and the bracket 20 can be inserted relative to the base 40. The protrusion 25 and the guide recess 41 are free to slide and move.

As long as the bracket 20 is slidable relative to the base 40, there is no limitation on its sliding configuration.

In this embodiment, the guide groove 41 is made into a C-shaped groove, and the insertion protrusion is made into an inverted T-shape.

The bracket 20 is provided with a holding chamber 23 for mounting the holding body 31 therein, and the base 40 is provided with a chamber for mounting a circuit board 46 and mounting a circuit board 38 therein.

The clamping body 31 and the circuit board mounting body 38 are connected together by elastic connecting contacts 30 .

On the bracket 20, the tube end supporting part 21, the lead groove 22 and the holding body accommodation chamber 23 are all formed with openings above, and they are provided in the longitudinal direction of the cold cathode tube so as to communicate with each other.

The lead groove 22 coincides with the lead part of the end of the cold cathode tube supported by the tube end support part 21 and opens in a U-shaped groove at the top; The shape of the backside side end and the upper opening of the back surface is such that the front end of the lead part inserted into the lead wire insertion groove 22 protrudes into the holder housing chamber 23 .

The clip body 31 connected to the elastic connection contact 30 is accommodated in the clip body accommodating chamber 23 , and the cover 50 for closing the opening of the clip body accommodating chamber 23 is installed in a semi-installed state.

2( a ) shows a perspective explanatory view of the socket 10 with the cover 50 attached, FIG. 2( b ) shows an external view seen from the front side, and FIG. 2( c ) shows an external view seen from the rear side.

The elastic connection contact 30 shown in this embodiment is shown in Figure 4, is to expand the sheet material made of elastic metal after integral punching and then bend it, and the clamping body 31, the circuit board mounting body 38 and the elastic deformation part 37 is integrally formed, and the elastic deformation portion 37 is made to fold back in a manner of alternately overlapping multiple times in the width direction of the board to form a meandering shape, which is corrugated.

Various shapes can be adopted as long as it is an elastic body that allows relative movement of the bracket 20 and the base 40, but the folded shape of this embodiment can increase the range of expansion and contraction, and its durability is also excellent.

The clamping body 31 has a bracket mounting portion 32 , push-in pieces 33 erected from both ends of the bracket mount 32 in the width direction with a U-shaped cross section, and elastic arms 34 extending from the push-in pieces 33 .

The bracket mounting part 32 is a flat plate along the bottom surface of the clamping body accommodation chamber 23, and its back side end is connected with the elastic deformation part 37, which is pressed from the clamping body accommodation chamber 23 into the front side. Press into the groove 23a to fix the holding body 31 on the bracket 20 .

The elastic deformation part 37 is provided on the base 40 so as to communicate with the holder housing chamber 23 and the circuit board installation body in such a manner that it hangs from the holder body 31 to the circuit board installation body 38 in a shape that snakes along the width direction relative to the sliding direction of the bracket 20. The accommodation chamber 46 is located in the spring displacement space 42 opened on the rear side.

The holding body 31 becomes the fully installed state by further pushing the cover 50 from the semi-installed state as described later, thereby elastically clamping the lead part of the cold cathode tube supported by the tube end supporting part 21 to the holding body accommodating chamber 23. The protruding part inside realizes the electrical connection.

The bracket 20 and the base 40 are connected by the elastic connecting contacts 30 which are elastically expandable, and are slidably connected to each other, so that the bracket 20 can elastically move relative to the base 40 .

Fig. 3 is an explanatory diagram of the elastic relative movement state of the support 20 with respect to the base 40, Fig. 3(a) shows a non-moving state, and Fig. 3(b) shows a state in which the base 40 has moved relatively to the back side with respect to the support 20, FIG. 3( c ) shows a state in which the stand 20 has relatively moved to the front side with respect to the base 40 .

When the bracket 20 slides and moves with respect to the base 40 , the elastic deformation portion 37 is stretched and elastically deformed to incline in the spring displacement space 42 .

Figure 5 shows the sequence of installing the end of the cold cathode tube on the socket.

The figure omits the board on which the socket is mounted, etc.

Cold cathode tube 1 as shown in Fig. 5 (a), makes cold cathode tube end 2 face the top of tube end supporting part 21, then as shown in Fig. 5 (b), cold cathode tube end 2 is put into In the pipe end support part 21.

If a gap in the width direction is provided in advance between the sliding portion of the bracket 20 and the base 40, the distortion in the longitudinal direction of the cold cathode tube can be absorbed.

At this time, the lead wire part 3 can be put and inserted into the lead wire support groove 57 of the cover 50 and the lead wire groove 22 of the holder 20 without load as described later.

As shown in FIG. 5(C), if the cover 50 is pushed in and fully installed, the lead part 3 is connected to the elastic connecting contact.

The structure of connecting the lead portion 3 and the elastic connection contact by making the cover 50 fully mounted will be described later.

There is a difference in expansion and contraction between the heat generated by the cold-cathode tube turned on and the contraction caused by the light-off, and the circuit board on which the socket 10 is installed. As shown in d), the base 40 moves toward the back side of the socket 10 relative to the bracket 20; when the cold cathode tube 1 expands compared to the circuit board, as shown in Figure 5(e), the bracket 20 moves along with the cold cathode tube. Stretch and move to the back side of the paper surface in Fig. 5 to absorb the difference in expansion and contraction.

As shown in FIGS. 1 and 9 , the base 40 is provided with a board insertion chamber 43 that is inserted into the end portion 4 a of the board and mounts the base 40 to the board in communication with the board mounting body chamber 46 .

In the circuit board insertion chamber 43, a guide piece 44 and a circuit board locking arm 45 are provided along the length direction of the cold cathode tube. As shown in FIG. According to the positions of the guide piece 44 and the circuit board locking arm 45, the circuit board end 4a is inserted into the circuit board insertion chamber 43, so that the claw 45a of the circuit board locking arm 45 is elastically locked in the slot of the circuit board 4 5, the circuit board 4 and the base 40 are connected together as shown in FIG. 9(b).

The circuit board mounting body 38 of the elastic connection contact 30 extends the elastic connection piece 39 in the circuit board insertion chamber 43, and elastically connects the elastic connection piece 39 to the circuit terminal of the circuit board by connecting the base 40 to the circuit board end 4a .

In addition, although the present embodiment shows an example in which the base 40 is inserted and installed on the circuit board, in order to correspond to it, the elastic connecting piece 39 is used to realize the electrical connection with the circuit of the circuit board; The method of mounting on the circuit board coincides with the replacement of the elastic connection piece by soldering the connection piece.

Next, the structure in which the lead wire portion of the cold cathode tube is elastically held by the holding body 31 will be described.

6(a) shows a front view of the cover 50, FIG. 6(b) shows a front view of the elastic connecting contact 30, and FIG. 6(c) shows a cross-sectional view along line C-C of FIG. 6(b).

In addition, Fig. 7 (a) is a sectional view corresponding to the A-A line of Fig. 1 (b) showing that the cover 50 is installed in a half-mounted position, and Fig. 7 (b) is a sectional view corresponding to the B-B line, and Fig. 7 ( c) is a cross-sectional view corresponding to the A-A line showing the socket with the cover 50 attached to the full mounting position, and FIG. 7( d ) is a cross-sectional view corresponding to the B-B line.

The cover 50 has a pair of cam arms 55 each having a cam portion 56 hanging down from the top plate portion 51 toward the mounting side of the bracket 20 near the center in the width direction of the cold cathode tube. Section 52.

On the respective outer surfaces of the top plate 51, half mounting claws 53 and full mounting claws 54 are respectively provided.

Between the upper surface of the top plate portion 51 and the cam arm 55, a groove-like lead wire support groove 57 opening upward is provided along the longitudinal direction of the cold cathode tube.

The insertion portion 52 hangs down from the top plate portion 51 in a shape along the inner surface of the cover guide piece 24 forming the side wall of the cold cathode tube width direction side of the holder housing portion 23 , and is inserted into the holder from above. At a position in the half-mounted state in the storage chamber 23 , a half-installation claw 53 is protrudingly provided so as to be quickly engaged with the locking portion 24 a of the cover guide piece 24 .

In this state, the cover 50 covers the locking portion 24 a between the half mounting claw 53 and the full mounting claw 54 so as not to come off from the bracket 20 .

Further, the full mounting claws 54 are provided to further push the cover 50 downward from the half mounting state, and quickly engage with the locking portion 24a of the cover guide piece 24 at the position of the fully mounting state shown in FIG. 2 .

In this way, the cover 50 adopts a two-stage fast locking structure to cover the bracket in two installation states with different installation depths.

The push-in piece 33 is pressed into the inner side of the U-shaped push-in groove 23a from the clamp body accommodation chamber 23 toward the front side together with the bracket mounting portion 32 to fix the clamp body 31 on the bracket 20 .

The elastic arms 34 are made to bend inwardly after extending from the respective pressing pieces 33 toward the extension direction of the end of the cold cathode tube, so that the elastic arms 34 are closed to each other.

A connection portion 35 protruding inward into a substantially herringbone cross-section and having a cutout at the top is provided at the folded portion of the elastic arm 34 , and a cam support portion 36 is provided at the free end.

The respective connection parts 35 are arranged so that when the cold cathode tube ends are supported by the tube end support parts 21, they are aligned with the lead parts inserted into the lead wire support grooves 57 and protruding into the holder accommodation chamber 23 at the same time. position, using the elastic restoring force of the elastic arm 34 to close each other.

The cam bearing part 36 is arranged so that when the cover 50 is mounted on the clamping body accommodation chamber 23, it is arranged on the path where the cam part 56 on the cam arm 55 passes, and the cam part 56 is guided by sliding contact in a push-off manner. Then, the elastic arm 34 is displaced in the width direction of the cold cathode tube, so that the elastic arm 34 is bent to open the connecting parts 35 to each other.

FIG. 8 is an explanatory diagram showing a state in which the end portion 2 of the cold cathode tube is attached to the socket 10 .

Fig. 8 (a) is a sectional view corresponding to the A-A line of Fig. 1 (b) showing that the cover 50 is in the half installation, and Fig. 8 (b) is a sectional view corresponding to the B-B line of Fig. 1 (b) showing that the cover 50 is in the half installation Sectional view, Fig. 8 (c) is a sectional view corresponding to the A-A line of Fig. 1 (b) showing that the cover 50 is fully installed, and Fig. 8 (d) is a sectional view corresponding to the B-B line of Fig. 1 (b) showing that the cover 50 is fully installed Corresponding sectional view.

The cam arm 55 is used to configure the cam portion 56 so that when the cover 50 is in a semi-installed state, the cam portion 56 displaces the cam support portion 36 outwards to open the connecting portions 35 between each other; when the cam 56 is in a fully installed state , the cam 56 is disengaged from the cam support portion 36 so that the connection portions 35 are closed from each other.

Thus, by covering the bracket 20 with the cover 50 in a half-attached state, the connection parts 35 can be opened, and the lead wire part 3 of the cold cathode tube end part 2 supported by the tube end support part 21 can be inserted without load. Between the connecting parts 35; by pushing the cover 50 in to be in a fully installed state, the lead part 3 can be elastically clamped between the connecting parts 35 to realize electrical connection.

FIG. 10( a ) shows a modified example of the structure of the elastic connecting piece 61 a of the elastic connecting contact 61 , and FIG. 10 ( b ) shows the socket 60 on which the elastic connecting contact 61 is installed.

Claims (4)

1. A cathode tube socket, used to electrically connect the cathode tube to one side of the power supply, is characterized in that, It has: a base installed on one side of the power supply, a bracket for assembling the cathode tube, and an elastic connecting contact arranged to span from the base to the bracket; The bracket is made to slide freely relative to the base along the length direction of the assembled cathode tube; The elastic connection contact has an elastic arm electrically connected to the cathode tube terminal in the bracket and an elastic connecting piece electrically connected to one side of the power supply in the base; The elastic arm and the elastic connecting piece are connected by an elastically deformable elastic deformation part. 2. The cathode tube socket according to claim 1, characterized in that, The elastic deformation portion of the elastic connection contact is formed by folding back the band-shaped elastic pieces alternately. 3. The cathode tube socket according to claim 1 or 2, characterized in that, A pair of elastic arms arranged in the bracket for applying elastic force are formed in the manner of clamping the cathode tube terminal from both sides, and the bracket is equipped with a cover with a cam arm for opening and closing the space between the pair of elastic arms. 4. The cathode tube socket according to any one of claims 1 to 3, characterized in that, The elastic connecting contact is integrally made by the elastic arm, the elastic deformation part and the elastic connecting piece with a metal plate.

Images