WO2010013394A1

WO2010013394A1 - Backlight device and method of assembling backlight

Info

Publication number: WO2010013394A1
Application number: PCT/JP2009/003106
Authority: WO
Inventors: 雅彦玉井; 栄二森; 徹也白石; 登志浩畑中
Original assignee: ハリソン東芝ライティング株式会社
Priority date: 2008-07-30
Filing date: 2009-07-03
Publication date: 2010-02-04
Also published as: TW201011202A; JP2011216185A

Abstract

A backlight device having a bent fluorescent lamp arranged in a housing, the bent fluorescent lamp being composed of at least two substantially parallelly arranged straight tube sections and a bend section for interconnecting the straight tube sections, the bent fluorescent lamp having electrodes mounted to opposite ends thereof. If the direction extending along the axes of the straight tube sections is an x-direction and the direction lying on a plane which is formed by the straight tube sections and by the bend section and extending perpendicular to the axes of the straight tube sections is a y-direction, the housing is provided with a first lamp holding body capable of suppressing a positional displacement of the bend section in the x-direction, a second lamp holding body capable of suppressing a positional displacement of one straight tube section in the y-direction, and a pair of variation absorbing holding body capable of suppressing a positional displacement, in at least the x-direction, of opposite ends of the bent fluorescent lamp. Since the bend section is held by the first holding section, said straight tube section is held by the second holding section, and opposite ends of the bent fluorescent lamp are held by the pair of variation absorbing holding sections, the backlight device can uniformly emit light and a breakage of the lamp can be suppressed.

Description

Backlight device and method for assembling backlight

The present invention relates to a backlight device and an assembling method thereof, and more particularly to a backlight device using a fluorescent lamp having a bent portion and an assembling method thereof.

Conventionally, backlight devices include a direct type in which a light source is arranged directly under a light emitting surface and a sidelight type in which a light source is provided on a side portion of a light guide plate arranged under the light emitting surface. In particular, the direct type backlight device is suitable for increasing the brightness because the light emitting surface is directly irradiated with light emitted from the light source.

In this direct type backlight device, a backlight device using a plurality of bent fluorescent lamps having a U-shaped or U-shaped bent portion is known. Since this apparatus can reduce the number of lamps used and the number of lighting circuits as compared with a direct backlight apparatus using a plurality of straight tube fluorescent lamps, it can be manufactured at low cost.

In this conventional backlight device, a plurality of diffusion sheets, a diffusion plate, and a reflection plate are arranged in order from the light emitting surface side inside a housing composed of a front frame and a back frame, and a plurality of diffusion sheets are disposed between the diffusion plate and the reflection plate. Are arranged in parallel so that their bent portions are located in the light emitting area and parallel to the light emitting surface (Patent Document 1 (paragraphs 0025 and 0028, FIG. See 1)).

The above-mentioned fluorescent lamp is arranged inside the housing with the electrode side of the lamp as an arrangement reference, a plurality of rubber holders provided on the lamp electrode side, and a pair of protrusions of the lamp holding plate arranged on the bottom surface of the housing Is held by.

In addition, by inserting one end of the electrode side of one straight tube portion of the fluorescent lamp arranged inside the housing into a wide cylindrical insertion portion, the variation in the position of the straight tube portion is absorbed and held. A backlight device is known (see Patent Document 2 (paragraph 0019, FIG. 1)).

There is also known a backlight device in which a bent portion of a fluorescent lamp is held by a support member and one end of a straight tube portion including an electrode portion is inserted and held in a rubber holder (Patent Document 3 (paragraph 0024, FIG. 1)). See FIG. 2)).

Japanese Patent Publication No. 2004-342576 Japanese Patent Publication No. 7-272521 Japanese Patent Publication No. 2005-332813

The backlight device described in Patent Document 1 utilizes the fact that a bent portion of a fluorescent lamp emits light brighter than other portions, and arranges the bent portion in a light emitting area to achieve high brightness. However, in order to emit light uniformly on the light emitting surface, for example, it is necessary to use a light shielding pattern sheet or the like that reduces the amount of transmitted light according to the light amount of the bent portion.

Incidentally, a manufacturing error of about ± 1.5 mm is generally allowed for the length of the straight tube portion of the bent fluorescent lamp. On the other hand, the design of the light-shielding pattern sheet provided between the diffuser plate on the light emitting surface and the fluorescent lamp, and the adjustment of the shape of the reflective surface, which is another method for correcting the brightness of the bent portion, and the reflectance of the surface A design for uniform light emission, such as a design, is designed to be assembled and processed based on a part of the housing. Therefore, when the electrode portions at both ends of the lamp are arranged on the bottom surface of the housing as the arrangement reference as in the backlight devices described in

Patent Documents

1 and 2, the position of the bent portion is caused by the error in the length of the lamp straight tube portion. Due to the variation, there is a problem that the luminance uniformity of the light emitting surface is lowered.

The above-mentioned problem is the same in the configuration in which the bent portion is arranged at a position where the upper and lower sides are covered by the front frame and the back frame (ineffective light emitting area). There is a problem of lowering.

On the other hand, a manufacturing error of about 2 mm is allowed in the interval between the straight pipe portions substantially parallel to each other. The error in the distance between the straight pipe portions depends on the distance between the connecting portions between the bent portion and the straight pipe portion and the bending angle at the connecting portion between the bent portion and the straight pipe portion. Therefore, when the fluorescent lamp is arranged in the backlight devices described in Patent Documents 1 and 3, there is a problem in that the fluorescent tube is stressed due to a manufacturing error in the interval between the straight tube portions and the fluorescent lamp is damaged. is there.

In the backlight devices described in Patent Documents 1 and 3, for example, when a lamp having an outer diameter of φ3.4 mm and an error allowed for the outer diameter of 0.4 mm is arranged, the straight tube portion of the lamp The width of the pair of protrusions for holding the opening or the opening width of the rubber holder for holding the end portion of the straight pipe portion is designed to be 3.2 mm to 3.6 mm. However, since a manufacturing error of about 2 mm is allowed for the interval between the straight pipe portions, it is necessary to widen these widths to about 4.6 mm in order to prevent stress on the straight pipe portions. However, when the width is increased in this way, there is a problem that the lamp is detached from the protrusion or the rubber holder due to vibration or the like and is damaged.

Therefore, one of the objects of the present invention is to provide a backlight device that emits light uniformly. Another object of the present invention is to provide a backlight device capable of suppressing breakage of a lamp.

The backlight device of the present invention includes a housing, at least two straight pipe portions arranged in the housing, and bent portions connecting the straight pipe portions, at both ends thereof. Is a backlight apparatus comprising a bent fluorescent lamp provided with an electrode, wherein the direction along the tube axis of the straight tube portion is the x direction, and is constituted by the straight tube portion and the bent portion The first lamp holder capable of suppressing displacement of the bent portion in the x direction when the y direction is a direction perpendicular to the tube axis of the straight tube portion. A pair of variations capable of absorbing at least x-direction positional variations of both ends of the body, a second lamp holder capable of suppressing the positional deviation of the one straight tube portion in the y-direction, and both ends of the bent fluorescent lamp An absorption holder, and the first lamp holder is bent by the bending holder. Parts, wherein the second lamp holder is characterized in that the straight pipe section one, the pair of the variation absorbent storage member at both ends of the bent fluorescent lamps are respectively held.

According to the present invention, it is possible to provide a backlight device that emits light uniformly and can suppress lamp breakage.

The disassembled perspective view which shows the backlight apparatus of this invention. The top view of the backlight apparatus of the 1st Example shown in FIG. The enlarged view of the backlight apparatus of the 1st Example shown in FIG. FIG. 4 is a cross-sectional view taken along A-A ′ of FIG. 3. The perspective view which shows a 1st dispersion | distribution absorption holding body. FIG. 6 is a cross-sectional view along B-B ′ in FIG. 5. The enlarged view of the backlight apparatus of a 2nd Example. The perspective view which shows the 2nd dispersion | distribution absorption holding body. The enlarged view of the backlight apparatus of a 3rd Example. FIG. 10 is a cross-sectional view taken along C-C ′ of FIG. 9. The enlarged view of the backlight apparatus of a 4th Example. FIG. 12 is a sectional view taken along the line D-D ′ of FIG. 11. The figure which shows the 1st modification of a fluorescent lamp. The figure which shows the 2nd modification of a fluorescent lamp. The figure which shows the 3rd modification of a fluorescent lamp. The enlarged view which shows the 1st modification of a lamp holder. The figure which shows the 2nd modification of a lamp holder. FIG. 18 is a cross-sectional view taken along line EE ′ of FIG. The perspective view which shows the modification of a 1st dispersion | distribution absorption holding body. The perspective view which shows the modification of a 2nd dispersion | distribution absorption holding body. The figure which shows the 1st modification of a holding plate. The figure which shows the 2nd modification of a holding plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an exploded perspective view showing a backlight device according to a first embodiment of the present invention. The backlight device 11 of the present embodiment is, for example, a backlight for a 15-inch liquid crystal monitor. As shown in FIG. 1, the housing 12 includes a frame-shaped front frame 13, a back frame 14, and substantially the same. It consists of

side plates

15a and 15b arranged in parallel.

Inside the housing 12, an optical sheet 16, a diffusing plate 17, and a bottom reflecting plate 18 composed of a diffusing sheet, a prism sheet, a polarizing sheet, and the like are arranged in this order from the light emitting surface side. The bottom reflection plate 18 has reflection side portions 18a formed so as to rise on two sides different from the two sides on which the

side plates

15a and 15b are arranged. Further, parallel side reflectors 19 are arranged along the side plates 15a.

FIG. 2 is a top view showing the backlight device shown in FIG. As shown in FIG. 2, between the diffuser plate 17 and the bottom reflector 18 shown in FIG. 1, a plurality of (here, two) bent fluorescent lamps 20 (hereinafter simply referred to as fluorescent lamps 20) They are arranged in parallel so as to be parallel to the light emitting surface. In FIG. 2, a part of FIG. 1 (the number of fluorescent lamps, the front frame, the optical sheet, and the diffusion plate) is omitted.

The fluorescent lamp 20 is a U-shaped cold cathode fluorescent lamp (CCFL: Cold Cathode Fluorescent Lamp) having a full length, that is, a lamp length before bending of about 800 mm. The fluorescent lamp 20 has an electrode portion 201 at one end on the side plate 18a side of the housing 12, two straight pipe portions 202 that are substantially parallel to each other, and a U-shape that connects the straight pipe portions 202 to each other. Of the bent portion 203. The bent portion 203 includes a straight tube portion 203a and bent portions 203b that connect both ends of the straight tube portion 203a and the straight tube portion 202 having the electrode portion 201, respectively. The longitudinal direction of the straight tube portion 203 a of the bent portion 203 is substantially orthogonal to the longitudinal direction of the straight tube portion 202 having the electrode portion 201.

In the following description, a straight tube having the electrode portion 201 on a plane parallel to the bottom surface of the housing 12 (for example, a plane constituted by the straight tube portion 202 and the bent portion 203 of the fluorescent lamp 20). A direction along the tube axis of the portion 202 is defined as an x direction. On this plane, the direction orthogonal to the x direction is defined as the y direction.

FIG. 3 is an enlarged top view showing the vicinity of the bent portion 203 of the fluorescent lamp 20 and the vicinity of one end of the straight tube portion 202 having the electrode portion 201. 4 is a cross-sectional view taken along the line AA ′ of FIG.

As shown in FIG. 3, one first lamp holder 24-1 and one second lamp holder 24-2 are provided on the bottom surface of the housing 12 for each fluorescent lamp 20. Has been placed. As shown in FIG. 4, the first lamp holder 24-1 has a structure in which a notch 24b is formed in the upper part of the side surface of the cylinder 24a. An arrangement pin 24c is provided below the outer surface of the cylinder 24a. The pins 24c are disposed on the bottom surface of the housing 12. The cylinder 24a of the lamp holder 24-1 is formed so that the inner diameter thereof is substantially equal to the outer diameter of the straight pipe portion 203a of the bent portion 203 so that the positional deviation of the bent portion 203 in the x direction can be suppressed. is there.

Further, the shape of the second lamp holder 24-2 is the same as that of the first lamp holder 24-1 shown in FIG. 4, and it is possible to suppress the displacement of the straight tube portion 202 in the y direction. In this way, the inner diameter of the cylinder 24a is formed to be substantially equal to the outer diameter of the straight pipe portion 202 having the electrode portion 201.

Here, suppression of misalignment means, for example, that when the straight tube portion 202 and the bent portion 203 are held by the lamp holder, the holding portion is not displaced in a direction perpendicular to the tube axis direction. Means that it is held firmly. Subsequent shift suppression has the same meaning.

As shown in FIG. 3, each of the first lamp holders 24-1 is arranged so that the direction of the central axis of the cylinder 24a is in the y direction. Further, the distance L1 between the side reflector 19 and the center axis of each cylinder 24a is arranged at the same position. The distance L1 is, for example, a position designed so that the bent portion 203 is arranged in a region where the top and bottom are covered by the front frame 13 and the back frame 14 of FIG. That is, the bent portion 203 is arranged in the invalid light emitting area 121 indicated by the oblique lines in FIG. 2 so that it hardly contributes to the light emission of the backlight device 11.

Further, the second lamp holder 24-2 is arranged so that the central axis of the cylinder 24a of the lamp holder 24-2 faces the x direction. Further, in the second lamp holder 24-2, the total length of the straight tube portion 202 is L5, and in the region (L5) / 2 in the −x direction from the boundary between the straight tube portion 202 and the bent portion 203, It arrange | positions in the position holding the straight pipe | tube part 202. FIG. In this embodiment, while L5 is about 380 mm, the second lamp holder 24-2 is disposed at a point of about 20 mm from the boundary between the straight tube portion 202 and the bent portion 203.

Furthermore, the position of the second lamp holder 24-2 in the y direction is a position designed so that the intervals of all the straight tube portions 202 included in the fluorescent lamp 20 are equal. That is, if the interval between the straight tube portions 202 of the fluorescent lamps 20 is P and the interval between the straight tube portions 202 of the adjacent fluorescent lamps 20 is L, the positions are designed so that P and L are equal. In this embodiment, both P and L are set to about 40 mm.

In the following description, the direction of the lamp holder means the direction of the central axis of the cylinder. In other words, it means the longitudinal direction of the portion held by the cylinder.

As shown in FIG. 3, on the bottom surface of the housing 12, a pair of variation absorbing holders 25 for one fluorescent lamp 20 is disposed along the side plate 15b. FIG. 5 is a perspective view showing the variation absorbing holder 25. FIG. 6 is a cross-sectional view taken along the line BB ′ of FIG. However, in FIG. 5, a part is omitted.

As shown in FIG. 5, the variation absorbing holder 25 has a straight pipe portion insertion port 25a. One end of the straight pipe part 202 in which the electrode part 201 is formed is individually inserted into the straight pipe part insertion port 25a.

At this time, the shape of the cross section (transverse cross section) of the straight tube portion insertion port 25a by a plane parallel to the reflection side portion 18a is an ellipse having a long axis in the y direction. The length of the long axis of the ellipse is longer than the variation due to the manufacturing error of the position in the y direction of the straight tube portion 202 so that the variation in the position in the y direction at both ends of the fluorescent lamp 20 can be absorbed. Yes. On the other hand, the length in the minor axis direction of the ellipse orthogonal to the major axis is substantially equal to the outer diameter of the straight pipe portion 202.

As shown in FIG. 6, the length L2 of the long hole forming the straight tube portion insertion port 25a is set so that the variation in the position in the x direction at both ends of the fluorescent lamp 20 can be absorbed as shown in FIG. If the maximum amount of variation due to a manufacturing error in the position of the distal end of the tube portion 202 is L3, it is formed longer than L3. Thereby, the dispersion | variation in the position of the straight pipe part 202 in the x direction is absorbed. In addition, the arrow which is not attached | subjected the code | symbol which faces the x direction and y direction shown in FIG. 3, FIG. 5 shows the direction where the dispersion | variation in the position of the direction shown by an arrow is respectively absorbed. The same applies to the subsequent drawings.

Here, the absorption of the variation in position means that, for example, even when the position of the straight pipe portion 202 to be held varies, the straight pipe portion 202 is always held without being stressed. Subsequent absorption of variation has the same meaning.

A lead wire 41 is connected to the electrode part 201 at one end of the straight pipe part 202 held by the dispersion absorbing holder 25. The lead wire 41 has a length that compensates for the above-described variation L3. The lead wire 41 is led out of the dispersion absorbing holder 25 through a lead wire hole 25b formed downward from the straight tube portion insertion opening 25a. The derived lead wire 41 is electrically connected to an external power source (not shown) by being connected to the harness 40 shown in FIG.

The plurality of variation absorbing holders 25 described above are arranged along the side plate 15b at the bottom of the housing 12 as shown in FIG. Each of the dispersion absorbing holders 25 is arranged so that the longitudinal direction of the straight pipe portion insertion port 25a faces the x direction.

When the fluorescent lamp 20 is attached to the backlight device 11 described above, the position in the x direction of the bent portion 203 and the position in one y direction of the straight tube portion 202 are used as a reference for the position when the fluorescent lamp 20 is disposed. Install. That is, first, the bent portion 203 is held by the first lamp holder 24-1 and the straight tube portion 202 is held by the second lamp holder 24-2. The holding procedure at this time may be simultaneous or one by one. Thus, after fixing the position of the bending part 203 in the x direction and the position of the one straight pipe part 202 in the y direction, one end of the straight pipe part 202 is held by the dispersion absorbing holder 25.

As described above, according to the backlight device 11 of the first embodiment, the position of the bent portion 203 is set as an arrangement reference in the x direction, and the position of one straight pipe portion 202 is set as an arrangement reference in the y direction. After the lamp 20 is arranged inside the housing 12, the fluorescent lamp 20 is arranged while absorbing variations in lamp position. Thereby, even if there is a manufacturing error in the fluorescent lamp 20, the position in the x direction of the bent portion 203 is arranged at the designed position, and at the same time, the position in the y direction of one straight pipe portion 202 is designed. Placed in. Therefore, the backlight device 11 can emit light uniformly. At that time, the first lamp holders 24-1 that hold the respective bent portions 203 of the plurality of fluorescent lamps 20 are arranged on one straight line along the y direction, and the x direction of the bent portions 203 of the respective lamps. Since the positions are aligned, it is possible to easily perform a design that suppresses unevenness due to each bent portion 203.

Since one of the bent portion 203 and the straight tube portion 202 can be arranged at the designed position, it is possible to easily design an apparatus for uniformly emitting light. Specifically, in the design of a light shielding pattern sheet provided between the diffusion plate 17 on the light emitting surface and the fluorescent lamp 20, and in the design of a device for uniform light emission such as adjustment of the shape of the reflecting surface and the reflectance of the surface, bending is performed. Since it is not necessary to consider the variation in the positions of the section 203 and the straight pipe section 202, the apparatus can be easily designed.

Further, the variation absorbing holder 25 can absorb variations in the position of the straight pipe portion 202 in the x direction and the y direction. Therefore, even if the length of the straight pipe portion 202 and the distance between the straight pipe portions 202 vary, one end of the straight pipe portion 202 is held without applying stress to the straight pipe portion 202. Therefore, damage to the fluorescent lamp 20 due to vibration or the like can be suppressed.

In addition, at least one second lamp holder 24-2 is disposed in the region of (L5) / 2 with respect to the total length L5 of the straight tube portion 202 from the boundary between the straight tube portion 202 and the bent portion 203. The straight tube portion 202 can be easily set as a reference for the position in the y direction, and even when the fluorescent lamp 20 is shaken by vibration or the like, the straight tube portion 202 in the vicinity of the bent portion 203 can be hardly damaged. It is more preferable that the distance between the straight pipe portion 202 and the bent portion 203 is within a region of (L5) / 4 with respect to the total length L5 of the straight pipe portion 202.

(Second embodiment)
FIG. 7 is an enlarged top view showing the vicinity of the bent portion 203 of the fluorescent lamp 20 and the vicinity of one end of the straight tube portion 202 having the electrode portion 201 in the backlight device of the second embodiment.

As shown in FIG. 7, the backlight device of the second embodiment is held by the second lamp holder 24-2 as compared with the backlight device of the first embodiment shown in FIG. The dispersion absorbing holder that holds one end of the straight pipe portion 202 is different.

Here, in the following description, the variation absorbing holder shown in FIGS. 5 and 6 is referred to as a first variation absorbing holder 25. In the second embodiment, the variation absorbing holder that holds one end of the straight tube portion 202 held by the second lamp holder 24-2 is referred to as a second variation absorbing holder 27.

FIG. 8 is a perspective view showing the second variation absorbing holder 27. As shown in FIG. 8, the second variation absorption holder 27 is different from the first variation absorption holder 25 in that the straight pipe portion insertion port 27 a has a circular cross-sectional shape. The straight pipe part insertion port 27 a is formed so that the diameter is substantially equal to the outer diameter of the straight pipe part 202. As a result, the second variation absorbing holder 27 absorbs the variation in the position of the straight pipe portion 202 held in the x direction in the x direction and suppresses the deviation of the position in the y direction. The position in the y direction can be arranged at the designed position while absorbing the variation in the position in the direction.

A pair of variation absorbing holders that hold one fluorescent lamp 20 and that includes the first variation absorbing holder 25 and the second variation absorbing holder 27 are arranged along the side plate 15 b of the housing 12. Yes. At this time, for example, the second variation absorption holders 27 are arranged such that the intervals of the straight tube portions 202 included in all the fluorescent lamps 20 arranged inside the housing 12 are equal to each other.

8, even when the fluorescent lamp 20 is attached to the backlight device shown in FIG. 8, the fluorescent lamp 20 is attached using the position of the bent portion 203 in the x direction and the position of the straight tube portion 202 in the y direction as an arrangement reference. That is, first, the bent portion 203 is held by the first lamp holder 24-1 and the straight tube portion 202 is held by the second lamp holder 24-2. The holding procedure at this time may be simultaneous or one by one. After holding one end of the bent portion 203 and one straight pipe portion 202 in this way, one end of the one straight pipe portion 202 is held by the second variation absorbing holder 27 and the other straight pipe portion 202 is held. Is held by the first variation absorbing holder 25.

Even with such a backlight device, it is possible to emit light uniformly as in the backlight device of the first embodiment. Further, it is possible to easily design for uniform light emission.

In addition, since one end of one straight tube portion 202 is held by the second variation absorbing holder 27 and one end of the other straight tube portion 202 is held by the first variation absorbing holder 25, the fluorescent lamp 20 is damaged. In addition, it is possible to arrange the position of one straight pipe portion 202 in the y direction at a position designed more easily and accurately.

(Third embodiment)
FIG. 9 is an enlarged top view showing the vicinity of the bent portion 203 of the fluorescent lamp 20 and the vicinity of one end of the straight tube portion 202 having the electrode portion 201 in the backlight device of the third embodiment. FIG. 10 is a cross-sectional view along CC ′ shown in FIG.

As shown in FIG. 9, the backlight device of the second embodiment is a first lamp that holds one fluorescent lamp 20 as compared with the backlight device of the second embodiment shown in FIG. The difference is that the holding body 24-1 and the second lamp holding body 24-2 are formed at predetermined positions near both ends on the L-shaped holding plate 28. The positions of the first and second lamp holders 24-1 and 24-2 on the holding plate 28 are positions designed in advance according to the fluorescent lamp 20 to be held.

As shown in FIG. 10, the first lamp holder 24-1 is formed on a pin 29 formed on an L-shaped holding plate. Although not shown, the second lamp holder 24-2 is also formed on the holding plate 28 in the same manner. Such a holding plate 28 is disposed on the bottom surface of the housing 12 by an arrangement pin 30. At this time, the holding plate 28 is arranged so that the positions of the first lamp holding body 24-1 and the second lamp holding body 24-2 are the same as those of the backlight devices of the first and second embodiments. In addition, it is disposed on the bottom surface of the housing 12.

Even when the fluorescent lamp 20 is attached to the backlight device shown in FIG. 9, the position of the bent portion 203 and the position of one straight tube portion 202 can be attached as a reference for the position when the fluorescent lamp 20 is arranged. . A specific attachment method is the same method as that of the backlight device of the second embodiment.

Even the backlight device according to the third embodiment described above can emit light uniformly as in the backlight device of the second embodiment. Further, it is possible to easily design for uniform light emission. Furthermore, damage to the fluorescent lamp 20 can be suppressed.

Furthermore, according to the backlight device of the third embodiment, since the first and second lamp holders 24-1 and 24-2 are formed at predetermined positions on the holding plate 28, the first, By arranging the holding plate 28 so that one of the second lamp holders 24-1 and 24-2 is arranged at a desired position, the other position is automatically determined. Therefore, the arrangement reference of the fluorescent lamp 20 can be easily determined.

(Fourth embodiment)
FIG. 11 is an enlarged top view showing the vicinity of the bent portion 203 of the fluorescent lamp 20 and the vicinity of one end of the straight tube portion 202 having the electrode portion 201 in the backlight device of the fourth embodiment. FIG. 12 is a cross-sectional view taken along the line DD ′ shown in FIG.

As shown in FIG. 11, the backlight device of the fourth embodiment is held by the second lamp holder 24-2 as compared with the backlight device of the third embodiment shown in FIG. The straight tube portion 202 is further held by a third lamp holder 24-3 disposed at the bottom of the housing 12 between the second lamp holder 24-2 and the second variation absorbing holder 27. Is different. Here, the second lamp holder 24-2 and the third lamp holder 24-3 are arranged in the same direction, and are arranged at the same distance from the reflection side portion 18a.

Also, a difference absorption lamp holding body 31 that holds the other straight pipe section 202 is arranged at the bottom of the housing 12 so as to face the x direction. The variation absorbing lamp holder 31 can absorb variations in the position of the other straight tube portion 202 in the y direction.

As shown in FIG. 12, the variation-absorbing lamp holder 31 is different in the cross-sectional shape of the cylindrical body from the first lamp holder 24-1 shown in FIG. That is, the variation absorption type lamp holder 31 includes a cylindrical body 32 having an elliptical cross-sectional shape. The length of the major axis of the ellipse is at least the length of the outer diameter of the other straight pipe portion 202 plus the maximum error allowed for the distance P between the straight pipe portions 202. Thereby, the dispersion | variation in the position of the y direction of the other straight pipe | tube part 202 can be absorbed.

When the fluorescent lamp 20 is attached to the backlight device shown in FIG. 11, the position of the bent portion 203 and the position of one straight tube portion 202 are attached as a reference for the position when the fluorescent lamp 20 is disposed. That is, first, the bent portion 203 is held by the first lamp holder 24-1 and one straight tube portion 202 is held by the second and third lamp holders 24-2 and 24-3. The holding procedure at this time may be simultaneous or one by one. After fixing the positions of the bent portion 203 and the one straight tube portion 202 in this way, the other straight tube portion 202 is held by the variation absorption type lamp holder 31. Finally, one end of one straight pipe portion 202 is held by the second variation absorbing holder 27 and one end of the other straight pipe portion 202 is held by the first variation absorbing holder 25.

Even the backlight device according to the fourth embodiment described above can emit light uniformly as in the backlight device according to the third embodiment. Further, it is possible to easily design for uniform light emission. Moreover, the arrangement | positioning reference | standard of the fluorescent lamp 20 can be defined easily. Furthermore, damage to the fluorescent lamp 20 can be suppressed.

Further, according to the backlight device of the fourth embodiment, one straight tube portion 202 is held by the third lamp holder 24-3, and the other straight tube portion 202 is held by the dispersion absorption type lamp holder 31. In particular, in the case of the long fluorescent lamp 20 in which the length L5 of the straight tube portion 202 exceeds 400 mm, breakage can be more effectively suppressed.

Although the backlight device according to the present embodiment has been described above, the present invention can be applied in various ways without departing from the spirit of the invention, and can be modified as follows, for example.

The fluorescent lamp 20 is not limited to a cold cathode fluorescent lamp, and may be an external electrode fluorescent lamp (EEFL: External Electrofluor Fluorescent Lamp) or a hot cathode fluorescent lamp (HCFL: Hot Cathode Fluorescent Lamp). Further, the length, diameter, number, etc. are not limited to those of the embodiment, and can be variously changed.

Further, as the fluorescent lamp 20, an S-shaped fluorescent lamp 20 having three straight pipe portions 202 substantially parallel to each other and two bent portions 203 connecting them as shown in FIG. 13 is applied. You can also. In this case, as shown in the figure, the straight pipe portion 202 located in the middle may be used as a reference in the y direction. Further, as shown in FIG. 14, a W-shaped fluorescent lamp 20 including four straight pipe portions 202 that are substantially parallel and three bent portions 203 that connect them can also be applied. In this case, as shown in the figure, the bent portion 203 located in the middle may be used as the reference in the x direction. Further, the bent portion 203 of the fluorescent lamp 20 is not limited to the shape having the straight tube portion 203b, and may be a shape configured in an arc shape as shown in FIG.

The cutout portions 24b of the first lamp holder 24-1 and the second lamp holder 24-2 are not limited to being opened at the upper part of the cylinder 24a, but may be formed so as to be opened at the side. . Further, the first lamp holder 24-1 and the second lamp holder 24-2 are arranged on the bottom surface of the housing 12, as shown in FIG. 16, and the distance between the pair of protrusions 26b is L4 or the holder. A holder formed so as to be larger than L4 to such an extent that variations in the position of the straight pipe portion 202 in the y-axis direction can be absorbed may be used.

As shown in FIG. 17 and FIG. 18 which is a cross-sectional view taken along the line EE ′ of FIG. 17, at least two first lamp holders 24-1 are provided inside the bent portion 203. May be constituted by a plurality of pins 26 a arranged at the bottom of the housing 12 so as to be in contact with the outside of the bent portion 203. In the case of the first lamp holder 24-1, the bent portion 203 is disposed so as to be sandwiched between these pins 26a, and is held in contact with the pin 26a at a plurality of locations in the y direction of the bent portion 203. As a result, the contact points between the fluorescent lamp 20 and the first lamp holder 24-1 can be dispersed. Therefore, since the local temperature drop of the fluorescent lamp 20 due to the contact can be suppressed, the position of the bent portion 203 in the x direction can be used as an arrangement reference, and the bias of the mercury to the bent portion 203 can be suppressed. .

As the first variation absorbing holder 25, any material can be used as long as it can be held even if the straight pipe portion 202 has a variation in length. For example, as shown in FIG. The glass portion in the vicinity of the electrode 201 of the fluorescent lamp 20 is like a lamp holder connected to the electrode 201 so as to absorb the positional variation in the y direction and absorb the positional variation in the x direction. Also good.

Further, as the second variation absorbing holder 27, any member can be used as long as it can hold even if there is a variation in the length of the straight tube portion 202 or the interval P between the straight tube portions 202. For example, as shown in FIG. The glass portion disposed near the electrode 201 of the fluorescent lamp 20 is connected to the electrode 201 so as to hold the glass portion in the vicinity of the electrode 201 of the fluorescent lamp 20 so as to suppress the positional deviation in the y direction and absorb the positional variation in the x direction. It may be like a lamp holder.

As shown in FIG. 21, the length in the y direction is straight as an L-shaped holding plate 28 on which the first lamp holding body 24-1 and the second lamp holding body 24-2 are arranged in the third embodiment. You may use what exceeds P / 2 which is the half length of the space | interval P between the pipe parts 202. FIG. In this case, the area of the triangle formed by the first lamp holder 24-1, the second lamp holder 24-2 and the pin 30 is increased. Therefore, the balance for holding the lamp when the bent portion 203 and the straight tube portion 202 are held is improved, and the shaking of the lamp due to impact, vibration, etc. is reduced, so that the lamp can be prevented from cracking.

Further, as shown in FIG. 22, a U-shaped holding plate 34 provided with a first lamp holder 24-1 at both ends and two second lamp holders 24-2 between them may be used. In this case, the holding plate 34 holds the adjacent straight tube portions 202 of the two fluorescent lamps 20 and the respective bent portions 203, so that the balance of holding the lamps over the holding plate 28 in FIG. 20 is improved. Since the vibration of the lamp due to impact, vibration, etc. is reduced, the cracking of the lamp can be suppressed. Further, the holding plate 34 can reduce variations in the central luminance of the backlight device 11. That is, in applications such as liquid crystal televisions, high central luminance is required, but the adjacent straight tube portions 202 of the two fluorescent lamps 20 are held by the two second lamp holders 24-2. Thus, the design based on the center of the backlight device 11 in the y direction can be performed. This is particularly effective when two fluorescent lamps 20 are used.

DESCRIPTION OF SYMBOLS 11 ... Backlight apparatus, 12 ... Housing | casing, 13 ... Front frame, 14 ... Back frame, 15a, 15b ... Side plate, 16 ... Optical sheet, 17 ... Diffusing plate 18 ... bottom reflector, 18a ... reflective side, 19 ... side reflector, 20 ... bend fluorescent lamp, 201 ... electrode part, 202 ... straight tube part, 203 ... bent portion, 203a ... straight tube portion of the bent portion, 203b ... bent portion at both ends of the straight tube portion 203a, 24-1 ... first lamp holder, 24a ... cylinder 24b... Notch, 24c... Pin, 24-2... Second lamp holder, 24-3... Third lamp holder, 25. Holder, 25a ... Straight pipe portion insertion port, 25b ... Hole for lead wire, 26a ... Pin, 26 b ... anti-protrusion, 27 ... second variation absorbing holder, 27a ... straight tube portion insertion port, 28, 34 ... holding plate, 29 ... pin, 30 ... for fixing , 31... Dispersion absorbing type lamp holder, 32... Elliptical cylindrical body

Claims

A bend comprising a case, at least two straight pipe portions arranged in parallel in the case, and a bent portion connecting the straight pipe portions, and electrodes provided at both ends thereof A fluorescent lamp, and a backlight device comprising:
A direction along the tube axis of the straight tube portion is an x direction, and a direction perpendicular to the tube axis of the straight tube portion is a y direction on a plane constituted by the straight tube portion and the bent portion. When
The housing includes a first lamp holder that can suppress positional deviation of the bent portion in the x direction, and a second lamp holder that can suppress positional deviation of the straight pipe portion in the y direction. And a pair of variation absorbing holders capable of absorbing at least the variation in the position in the x direction at both ends of the bent fluorescent lamp,
The bent portion is held by the first lamp holder, the straight tube portion is held by the second lamp holder, and both ends of the bent fluorescent lamp are held by the pair of variation absorbing holders. A backlight device characterized by that.
The pair of variation absorbing holders can absorb the positional variation in the x direction and the first variation absorbing holder that can absorb the positional variation in the x direction and the y direction, and can suppress the positional deviation in the y direction. And a second variation absorbing holder.
The second variation absorbing holder holds an end of the bent fluorescent lamp held by the second lamp holder, and the first variation absorbing holder holds the other bent fluorescent lamp. The backlight device according to claim 1, wherein an end portion is held.
At least one of the second lamp holders is disposed in a region of (L5) / 2 with respect to the total length L5 of the straight tube portion from the boundary between the straight tube portion and the bent portion. The backlight device according to claim 1.
The backlight device according to claim 1, wherein the first and second lamp holders are provided near both ends of an L-shaped holding plate.
The backlight device according to claim 1, wherein the first lamp holder is composed of one or a plurality of contact pieces and holds the bent portion in contact with each other.
A plurality of the bent fluorescent lamps are provided, and the first lamp holders that hold the bent portions of the bent fluorescent lamps are arranged on a straight line along the y direction. Item 2. The backlight device according to Item 1.
A bend comprising a case, at least two straight pipe portions arranged in parallel in the case, and a bent portion connecting the straight pipe portions, and electrodes provided at both ends thereof And a method for assembling a backlight device comprising a fluorescent lamp,
A direction along the tube axis of the straight tube portion is an x direction, and a direction perpendicular to the tube axis of the straight tube portion is a y direction on a plane constituted by the straight tube portion and the bent portion. When
The housing includes a first lamp holder that suppresses positional deviation of the bent portion in the x direction, and a second lamp holder that suppresses positional deviation of the straight pipe portion in the y direction; A pair of variation absorption holders that absorb at least the position variation in the x direction at both ends of the bent fluorescent lamp,
After positioning the bent fluorescent lamp by holding the bent portion in the first lamp holder and holding the straight tube portion in the second lamp holder,
A method of assembling a backlight device, comprising: arranging the bent fluorescent lamp while absorbing variation in the x-direction and y-direction positions of both ends of the bent fluorescent lamp by the variation absorbing holder.