JP2010192173A - Fluorescent tube holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a withstand voltage between the metal portion on a holder side and an external metallic body base in a fluorescent tube holder for holding a plurality of fluorescent tubes. <P>SOLUTION: Metal portions, such as a plurality of electrode holding portions 37, a first band plate 32, a second band plate 33, and projection pieces 35a, are made of the same metal plate. The electrode holding portions 37 are protrudedly provided on the surface 21a of an insulation base 20 made of synthetic resin, and metal portions, such as the first band plate 32, second band plate 33 and projection pieces 35a, are provided on a back surface 21b of the insulation base 20. A withstand voltage between the internal metal portions and an external metallic body base can be improved by covering the back surface 21b of the insulation base 20 with an insulation cover 29 made of synthetic resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fluorescent tube holder that holds electrode portions of a plurality of fluorescent tubes used in a backlight device for a liquid crystal display device.

  In a liquid crystal display device used for a display of a television or a personal computer, a backlight device is provided on the back of a transmissive liquid crystal cell. The backlight device includes a plurality of fluorescent tubes arranged in parallel to each other, a fluorescent tube holder that holds electrode portions formed at both ends of each fluorescent tube, and a main body base that supports the fluorescent tube holder. It is configured.

  The fluorescent tube holder has a long shape and is disposed on both sides of the plurality of fluorescent tubes, and extends in a direction in which the longitudinal direction is orthogonal to the fluorescent tubes. In this fluorescent tube holder, conductive sockets to which the electrode portions of the respective fluorescent tubes are fitted are arranged at intervals in the longitudinal direction, and conductive currents connected to the respective sockets are connected. There is a road.

  As described in Patent Document 1 below, in the conventional fluorescent tube holder, the sockets formed independently are fixed individually to the surface of a substrate formed of a rectangular plate material. The socket has a metal contact holding portion attached to a housing formed of a plastic material, and a convex portion provided at the bottom of each housing is fitted into an attachment hole formed in the substrate. Thus, the socket is positioned and fixed on the board.

  The conductive path for energizing each socket is composed of a conductive metal thin film formed on the surface of the substrate.

JP 2006-344602 A

  A conventional fluorescent tube holder is easily configured in a state where a metal part for wiring other than the contact holding part is exposed on the outer surface of the housing. In particular, if a part of the contact holding part or the metal part that becomes the wiring member is exposed on the lower surface side of the housing, the withstand voltage decreases between the exposed metal part and the metal chassis below it, and discharge occurs. There are problems such as.

  An object of the present invention is to provide a fluorescent tube holder capable of increasing the withstand voltage between a metal part in a housing and an external metal chassis.

The present invention provides a fluorescent tube holder in which a plurality of conductive sockets electrically connected to electrode portions provided at the end of the fluorescent tube are arranged.
The socket has an electrode holding portion for holding the electrode portion and a metal support portion provided at a base portion of the electrode holding portion, and the metal support portion is fixed to an insulating base formed of an insulating material. The electrode holding portion is supported on the front side of the insulating base, and at least a part of the metal supporting portion appears on the back surface of the insulating base,
An insulating cover made of an insulating material is attached to the back side of the insulating base, and the metal support portion is covered with the insulating cover.

  In the present invention, it is preferable that a wiring member for energizing each socket is provided on the back side of the insulating base, and the wiring member is also covered with the insulating cover.

  In the fluorescent tube holder of the present invention, since the metal portion is not exposed on the back side of the insulating base, even if the fluorescent tube holder is placed close to the metal main body base, the withstand voltage of the current-carrying portion to the holder is increased. be able to.

  Further, according to the present invention, ribs projecting on the back side are formed on both side edges extending in the longitudinal direction of the insulating base, and the insulating cover is fitted between the ribs on both sides. It is preferable that the metal support part or the wiring member is covered so as not to be exposed to the side part.

  By covering the metal part with the side ribs as described above, the fluorescent tube holder can be disposed at a position close to the side plate of the metal main body base.

  In the present invention, it is preferable that the edge portion of the insulating base and the edge portion of the insulating cover are fixed by a concave-convex fitting between a hooking claw and a hooking recess.

  According to the present invention, an insulating wall facing the end of the electrode portion of the fluorescent tube held by the electrode holding portion is formed upright on the surface of the insulating base where the electrode holding portion is disposed. Those are preferred.

  When the insulating wall is formed, when the insulating wall faces the side plate of the metal main body base, the dielectric strength between the end of the electrode portion of the fluorescent tube and the side plate is increased. Can do.

  In the fluorescent tube holder of the present invention, the metal part other than the electrode holding portion is not exposed to the outside of the housing, so that the withstand voltage between the metallic main body base and the metal portion in the fluorescent tube holder can be increased. it can. For this reason, for example, discharge between the metal portion of the fluorescent tube holder and the metal main body base can be prevented in advance.

  In addition, since the withstand voltage can be increased, it is possible to mount the fluorescent tube holder close to the metallic main body base, and a thin backlight device can be obtained.

It is a top view which shows a backlight apparatus. It is an expanded sectional view which shows the cross section which cut | disconnected the backlight apparatus of FIG. 1 by the II-II line. It is an expansion perspective view which shows the fluorescent tube holder currently used for the backlight apparatus. It is an expansion perspective view which shows the metal part provided in the insulation base of the fluorescent tube holder shown in FIG. (A) is the enlarged side view which looked at the fluorescent tube holder shown in FIG. 3 from the Va arrow direction, (B) is the enlarged side view which looked at the metal part shown in FIG. 4 from the Vb arrow direction. It is a disassembled perspective view of the fluorescent tube holder shown in FIG. It is the expanded sectional view which cut | disconnected the fluorescent tube holder shown in FIG. 3 by the VII-VII line, and was seen from the arrow direction, (A) is the state which attached the insulating cover to the insulating base, (B) is from the insulating base. The state which isolate | separated the insulation cover is shown.

  As shown in FIG. 2, the backlight device 1 is disposed on the back surface of the liquid crystal cell 5. The liquid crystal cell 5 is a transmissive type capable of full color display. The light emitted from the backlight device 1 makes it possible to clearly see the image of the liquid crystal cell 5.

  As shown in FIGS. 1 and 2, the backlight device 1 has a metal base 2. The main body base 2 is formed by bending an iron plate such as a rolled steel plate. The main body base has a shallow box shape, a rectangular bottom plate 2a, long side plates 2b and 2c bent at right angles from the long sides of the bottom plate 2a, and a short side plate bent at right angles from the short sides of the bottom plate 2a. 2d, 2e.

  The metal plate constituting the main body base 2 is plated or coated on the surface, but is further processed so that the inner surface 2f of the bottom plate 2a facing the fluorescent tube 70 can function as a reflecting surface. . For example, a thin white sheet is laid on the inner surface 2f, a thin metal sheet is laid, or white or metal color coating is applied.

  A pair of long fluorescent tube holders 10 and 10 are fixed to the inner surface 2f of the bottom plate 2a of the main body base 2. One fluorescent tube holder 10 is fixed to the bottom plate 2a just inside the short side plate 2d of the main body base 2, and the other fluorescent tube holder 10 is fixed to the bottom plate 2a just inside the short side plate 2e of the main body base. It is fixed. The fluorescent tube holder 10 arranged inside the short side plate 2d and the fluorescent tube holder 10 arranged inside the short side plate 2d are exactly the same, but their arrangement directions are 180 degrees different. .

  As for the fluorescent tube holder 10, the metal part 30 shown in FIG. 4 is attached to the insulating base 20 formed of the synthetic resin material shown in FIG. A socket 31 is formed by a part of the metal part 30. The socket 31 is exposed upward from the surface 21 a of the insulating base 20, and the socket 31 is provided at a certain interval in the longitudinal direction of the insulating base 20.

  As shown in FIG. 1, in the fluorescent tube holder 10 provided on the inner side of the short side plate 2d of the main body base 2 and the fluorescent tube holder 10 provided on the inner side of the short side plate 2e, the sockets 31 face the same position on the left and right, respectively. To be arranged. The fluorescent tube 70 is held between the fluorescent tube holders 10 on both sides. The fluorescent tube 70 includes an arc tube main body 71 and electrode portions 72 and 72 provided on both sides thereof. The electrode portions 72 and 72 on both sides are fitted into the socket 31 of the right fluorescent tube holder 10 and the socket 31 of the left fluorescent tube holder 10 shown in FIG. Is disposed at a position slightly away from the inner surface 2 f of the bottom plate 2 a of the main body base 2.

  The electrode portions 72 of the plurality of fluorescent tubes 70 are fitted into all the sockets 31 provided in the fluorescent tube holder 10, and in the embodiment shown in FIG. A fluorescent tube 70 is attached.

  The fluorescent tube 70 shown in FIGS. 1 and 3 is an EEFL type, and a capacitor for generating a voltage at the time of lighting is incorporated in the electrode portion 72, and it is necessary to attach the capacitor to the fluorescent tube holder 10 Absent. However, the fluorescent tube does not include a capacitor, and the electrode portion may be energized through a capacitor mounted on the socket.

  As shown in FIG. 4, the metal part 30 provided in the insulating base 20 is formed by punching and bending a single metal plate. The metal plate which comprises the metal part 30 is iron plates, such as a rolled steel plate which is electroconductivity and high intensity | strength. A steel plate whose surface is plated is preferably used.

  As shown in FIG. 4, the metal part 30 is provided with a first band plate 32 and a second band plate 33 that extend in parallel in the longitudinal direction of the fluorescent tube holder 10, and the first band plate 32. And the second strip 33 are connected to each other via a socket 31 formed therebetween.

  The socket 31 is formed with a connecting plate portion 34 for connecting the first band plate 32 and the second band plate 33. As shown in FIG. 4, a projecting piece 35 a extending in parallel with the first strip plate 32 and the second strip plate 33 is formed integrally with the central portion of the connecting plate portion 34. As shown in FIG. 5B, the folded portion 35b continuous to the protruding piece 35a is folded 180 degrees from the protruding piece 35a toward the back side, and the support plate portion 36 having a rectangular shape is formed on the folded portion 35b. Are integrally formed. As shown in FIG. 7, a positioning hole 36 a penetrating vertically is formed at the center of each support plate portion 36.

  As shown in FIG. 4, an electrode holding piece 37 a and an electrode holding piece 37 b that are bent from both sides of the connecting plate portion 34 and face each other are provided on the inner side of the first band plate 32. Inside the band plate 33, there are provided an electrode holding piece 37c and an electrode holding piece 37d which are bent from both sides of the connecting plate portion 34 and face each other. The electrode holding portion 37 of the socket 31 is formed by the electrode holding piece 37a and the electrode holding piece 37b, and the electrode holding piece 37c and the electrode holding piece 37d. The support plate portion 36 is laid under the electrode holding portion 37. In this embodiment, the connection plate portion 34 or the support plate portion 36, or the connection plate portion 34 and the support plate portion 36 are metal support portions that support the electrode holding portion 37.

  The support plate portion 36 and the electrode holding pieces 37 a, 37 b, 37 c, 37 d are integral with the connecting plate portion 34, and are cut out from between the first strip plate 32 and the second strip plate 33. Therefore, a notch 38 is formed between the first band plate 32 and the second band plate 33 and between the adjacent electrode holding portions 37.

  A connector electrode 39 is provided at the end of the first band plate 32. The connector electrode 39 is formed by bending a conductive metal plate different from the metal plate forming the first band plate 32 and the like, and is fixed to the upper surface of the first band plate 32 by welding. .

  As shown in FIG. 3, the insulating base 20 includes an opposing side edge portion 20a facing the short side plate 2d or 2e of the main body base 2 and an extended side edge portion from which the fluorescent tube 70 held by the socket 31 extends. 20b.

  As shown in FIGS. 3, 6, and 7 (B), a rib 21 c integrally formed on the back surface 21 b of the insulating base 20 so as to protrude downward from the opposite side edge portion 20 a and an extension Ribs 21d integrally formed so as to protrude downward from the side edge portion 20b are formed so as to extend in parallel with each other along the longitudinal direction. The rib 21c extending downward from the opposite side edge 20a is integrally formed with a hooking claw 21e with a space in the longitudinal direction, and the rib 21d is integrally formed with a hooking claw 21f with a space in the longitudinal direction. Is formed. The hooking claws 21e and the hooking claws 21f are directed toward the center side of the insulating base 20.

  In the insulating base 20, rectangular openings 22 penetrating from the front surface 21a to the back surface 21b are formed at intervals in the longitudinal direction.

  As shown in FIGS. 7A and 7B, the metal part 30 is attached to the back surface 21 b of the insulating base 20. Each electrode holding piece 37a, 37b, 37c, 37d constituting the socket 31 is inserted into each opening 22 from the back surface 21b side of the insulating base 20, and each electrode holding piece 37a, 37b, 37c, 37d is inserted into the insulating base. 20 is projected upward from the surface 21a. At this time, the edge of the right first band plate 32 hits the inner surface of the rib 21c of the opposing side edge 20a, and the edge of the left second band plate 33 corresponds to the rib 21d of the extended side edge 20b. The metal part 30 is positioned by being sandwiched between the rib 21c and the rib 21d.

  As shown in FIG. 6, an insulating cover 29 is attached to the back surface 21 b of the insulating base 20. The insulating cover 29 is formed in an elongated shape from an insulating synthetic resin, and is overlapped on the back surface 21 b of the insulating base 20. The width dimension of the insulating cover 29 substantially matches the facing distance between the rib 21c and the rib 21d, and the insulating cover 29 is positioned between the rib 21c and the rib 21d.

  As shown in FIG. 6, the insulating cover 29 is formed with a rectangular first receiving recess 29a, and the first receiving recess 29a is arranged at an interval in the longitudinal direction. A second receiving recess 29b protruding in the longitudinal direction is formed on one edge of each first receiving recess 29a. In addition, a positioning protrusion 29c protruding upward is integrally formed at the center of each first receiving recess 29a.

  In a portion excluding the first accommodation recess 29a, the second accommodation recess 29b, and the positioning projection 29c, the surface 29A of the insulating cover 29 is a flat surface whose entire area is the same plane.

  As shown in FIG. 7B, a latching recess 29d is formed in the lower portion of the right edge portion of the insulating cover 29 with a space in the longitudinal direction, and a space in the longitudinal direction is formed in the lower portion of the left edge portion. A latching recess 29e is formed. The right latching recess 29d is formed at the same position as the latching claw 21e of the insulating base 20, and the left latching recess 29e is formed at the same position as the latching claw 21f of the insulating base 20.

  When the insulating cover 29 is mounted between the rib 21c and the rib 21d of the insulating base 20, the latching claw 21e and the latching recess 29d are fitted, and the latching claw 21f and the latching recess 29e are fitted. An insulating cover 29 is held on the back surface 21 b of the insulating base 20. At this time, the first strip 32 and the second strip 33 are sandwiched between the back surface 21b of the insulating base 20 and the front surface 29A of the insulating cover 29, and are held without moving up and down.

  Further, the support plate portion 36 of the metal portion 30 is accommodated in the first accommodating recess 29a of the insulating cover 29, and the protruding piece 35a and the folded portion 35b are accommodated in the second accommodating recess 29b. The positioning convex portion 29 c on the insulating cover 29 side is inserted into the positioning hole 36 a of the support plate portion 36. As a result, the insulating cover 29 is positioned in the first housing recess 29 a of the insulating base 20.

  By attaching the insulating cover 29 to the back surface 21b of the insulating base 20, the first and second strips 32, 33 appearing on the back surface 21b of the insulating base 20, the support plate portion 36 of the socket 31, and Each metal material part such as the protruding piece 35a and the folded part 35b is covered with an insulating cover 29 made of an insulating material. In the opposite side edge portion 20a, the right edge of the first band plate 32 is covered with the rib 21c, and in the extended side edge portion 20b, the left edge of the second band plate 33 is covered with the rib 21d. . Therefore, no metal part is exposed at the lower surface and both side edges of the insulating base 20.

  Therefore, the withstand voltage of the metal part 30 can be increased. Accordingly, it is possible to prevent discharge between the metal base and the like. Further, by providing the insulating cover 29, the insulating base 20 can be disposed close to the main body base 2, and a backlight device that is thinner and smaller than the conventional one can be configured.

  As shown in FIG. 3, the electrode portion 72 of the fluorescent tube 70 is sandwiched and attached between the electrode holding piece 37a and the electrode holding piece 37b and between the electrode holding piece 37c and the electrode holding piece 37d. .

  An insulating wall 23 is formed integrally with the surface 21a of the insulating base 20 so as to rise almost vertically on the opposite edge 20a side. As shown in FIG. 5A, the plurality of insulating walls 23 are opposed to the socket 31 from the side of the extended side edge portion 20a. Therefore, when the electrode part 72 of the fluorescent tube 70 is attached to the electrode holding part 37 of the socket 31, the end surface 72 a of the electrode part 72 faces the insulating wall 23.

  As shown in FIG. 3, a connector portion 24 that protrudes upward from the end portion is integrally formed on the surface 21 a of the insulating base 20. The connector portion 24 has a connector housing 24a and an insertion space 24b formed in the connector housing 24a, and a connector electrode 39 shown in FIG. 4 appears in the insertion space 24b.

  The insulating base 20 has a plurality of mounting holes 25 penetrating the front and back, and the insulating cover 29 has corresponding mounting holes 29d.

  As shown in FIG. 1, the fluorescent tube holder 10 has a long shape and the insulating base 20 is formed of a synthetic resin. However, both sides (opposite side edge 20a side and extended side edge 20b) on the back surface 21b side thereof. Side), the first strip 32 and the second strip 33 are respectively provided in the longitudinal direction. Therefore, the first strip 32 and the second strip 33 have the long insulating base 20. Strength can be increased. In particular, the first band plate 32 and the second band plate 33 pass through the side portions of the plurality of sockets 31, and a metal band plate is always formed between the adjacent sockets 31 and 31. Therefore, the probability that the insulating base 20 is damaged by bending stress during the operation can be extremely reduced. In addition, since the synthetic resin insulating cover 29 attached to the back surface of the insulating base 20 can also function as a reinforcing plate, the strength of the insulating base 20 can be further increased.

  As shown in FIG. 1, the fluorescent tube holder 10 is installed on the bottom plate 2 a of the main body base 2. As shown in FIG. 6, positioning convex portions 2a1 are formed at a plurality of positions on the surface side of the bottom plate 2a. Each positioning convex portion 2a1 is inserted into the corresponding mounting hole 29f and mounting hole 25 and positioned. Then, attachment holes 29f provided at both ends in the longitudinal direction and attachment screws (not shown) inserted through the attachment holes 25 are screwed and fixed to the bottom plate 2a. Alternatively, the lock recesses 28 provided at both ends in the longitudinal direction of the insulating base 20 may be fixed by engaging with lock protrusions (not shown) provided on the main body base 2 side.

  Then, a power supply plug (not shown) is attached to the connector portion 24, and power is supplied to the connector electrode 39. The electric power given to the connector electrode 39 is given to each socket 31 via the first strip plate 32 and the second strip plate 33. The first band plate 32 and the second band plate 33 function as respective energizing wiring members. Since all the metal portions 30 shown in FIG. 4 can be press-molded from the same metal plate except for the connector electrodes 39, the manufacture is easy. The connector electrode 39 may be integrally bent from the first band plate 32 or the second band plate 33.

  Furthermore, since the insulating wall 23 made of synthetic resin rises between the end surface 72a of the electrode portion 72 of the fluorescent tube 70 attached to the socket 31 and the metal short side plate 2d, the electrode portion 72 and the main body base 2 are raised. It is possible to secure sufficient insulation. Further, as described above, since the metal portion 30 is not exposed on the back surface 21b, the opposing side edge portion 20a, and the extended side edge portion 20b of the insulating base 20, the insulation between the metal portion 30 and the metal main body base 2 is achieved. A long distance can be secured substantially.

  In the above-described embodiment, the first band plate 32, the second band plate 33, and the plurality of sockets 31 of the metal part 30 are integrally formed, and the first band plate 32 and the second band plate are formed. 33 is sandwiched between the insulating base 20 and the insulating cover 29.

  However, the present invention is not limited to the above-described embodiment, and any structure for attaching the socket 31 and the like to the insulating base 20 may be used as long as the back surface of the insulating base 20 is covered with the insulating cover 29. . For example, a plurality of metal sockets 31 are formed separately, and each socket 31 includes an electrode holding portion 37 and a metal support portion formed integrally with a base portion thereof. Alternatively, the electrode holding portion 37 and a metal support portion formed separately from the electrode holding portion 37 and fixed to the electrode holding portion 37 are configured. The individual metal support portions are inserted into the slits formed in the insulating base 20, or the metal support portions extend to the back surface of the insulating base 20 and are fixed by soldering or press-fitting means. Sockets 31 are individually fixed. A wiring member or wiring layer separate from the socket 31 is provided on the insulating base, and all the sockets 31 are energized through the wiring member or wiring layer.

  Also in this case, the back surface of the insulating base 20 is covered with the insulating cover 29, so that the metal support portion, the wiring member, or the wiring layer of the socket 31 can be prevented from being exposed to the back surface side.

  Also, the latching claws 21e and 21f are formed on the insulating cover 29, the latching recesses 29d and 29e are formed on the insulating base 20, and the latching claws 21e and 21f and the latching recesses 29d and 29e are fitted. Good.

DESCRIPTION OF SYMBOLS 1 Backlight apparatus 2 Main body base 2a Bottom plate 2d, 2e Short side plate 5 Liquid crystal cell 10 Fluorescent tube holder 20 Insulation base 21a Front surface 21b Back surface 21c, 21d Rib 21e, 21f Hanging claw 22 Opening part 23 Insulating wall 24 Connector part 29 Insulating cover 29A Insulating cover surface 29a First housing recess 29b Second housing recess 29c Positioning projections 29d, 29e Latching recess 30 Metal portion 31 Socket 32 First strip plate 33 Second strip plate 34 Connecting plate portion (metal) Support part)
35a Projection piece 35b Folding part 36 Support plate part (metal support part)
37 Electrode holding part 37a, 37b, 37c, 37d Electrode holding piece 39 Connector electrode 70 Fluorescent tube 72 Electrode part

Claims (6)

In a fluorescent tube holder in which a plurality of conductive sockets electrically connected to electrode portions provided at the end of the fluorescent tube are arranged,
The socket has an electrode holding portion for holding the electrode portion and a metal support portion provided at a base portion of the electrode holding portion, and the metal support portion is fixed to an insulating base formed of an insulating material. The electrode holding portion is supported on the front side of the insulating base, and at least a part of the metal supporting portion appears on the back surface of the insulating base,
A fluorescent tube holder, wherein an insulating cover made of an insulating material is attached to the back side of the insulating base, and the metal support portion is covered with the insulating cover.   The fluorescent tube holder according to claim 1, wherein a wiring member for energizing each socket is provided on the back side of the insulating base, and the wiring member is also covered with the insulating cover.   Ribs that protrude on the back side are formed on both edge portions extending in the longitudinal direction of the insulating base, and the insulating cover is fitted between the ribs on both sides. The fluorescent tube holder according to claim 1, wherein the fluorescent tube holder is covered so as not to be exposed to the side portion.   Ribs projecting to the back side are formed on both edge portions extending in the longitudinal direction of the insulating base, and the insulating cover is fitted between the ribs on both sides. The fluorescent tube holder according to claim 2, wherein the fluorescent tube holder is covered so as not to be exposed.   The fluorescent tube holder according to any one of claims 1 to 4, wherein an edge portion of the insulating base and an edge portion of the insulating cover are fixed by an uneven fitting between a hooking claw and a hooking recess.   The insulating wall facing the end of the electrode portion of the fluorescent tube held by the electrode holding portion is formed upright on the surface of the insulating base on which the electrode holding portion is disposed. The fluorescent tube holder according to any one of the above.

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