JP4364184B2 - Light reflector and backlight - Google Patents

Description

The present invention is a clip attached to the chassis by a light reflector having a bent portion partially in contact with the clip, and a backlight and a said light reflector and the fluorescent tubes.

  For a backlight of a liquid crystal display device or the like, a reflecting plate that reflects light from a fluorescent tube toward the liquid crystal panel is used (for example, see Patent Document 1). A flat plate is often used as the reflecting plate, but there is also a plate in which a part of the reflecting plate is bent in order to increase the reflection efficiency. FIG. 7 is a perspective view showing an example of a reflector that is partially bent. The reflection plate 1 has a flat plate portion 1a on which the fluorescent tube is disposed, and a protruding portion 1b bent in a dogleg shape between the flat plate portions.

  The reflecting plate 1 is attached to the chassis 30 by a clip 20 having the same shape as the protruding portion 1b and the flat plate portion 1a. Specifically, the flat plate portion 1a of the reflecting plate 1 and the chassis 30 are provided with through holes 16 so that the positions thereof overlap each other, and a mounting protrusion 22 whose tip is formed in a barb shape is provided on the back side of the clip 20. The clip 20 is attached to the chassis 30 so as to sandwich the reflector 1 therebetween by pushing the attachment protrusion 22 into the through hole 16.

The reflector 1 is made of a plastic material such as foamed PET having a thickness of about 1 mm in order to reduce the weight. As a method of bending the plastic reflector 1, a perforated through-hole row (hereinafter referred to as a perforation) 14 is formed on a flat reflector and is bent along the perforations 14.
Japanese Patent No. 36553272

  Since the light from the fluorescent tube is irradiated to the reflector 1 and heat is applied, deformation due to heat occurs. 8A and 8B are cross-sectional views taken along the line YY of FIG. 7, FIG. 8A shows a state before thermal deformation occurs, and FIG. 8B shows thermal deformation. Indicates the state. When thermal deformation occurs, the volume of the reflecting plate 1 changes, and force due to the volume change is applied to the perforation 14, so that the spatial volume of the perforation 14 changes.

  In the portion where the clip 20 is attached, the change in the spatial volume of the perforation 14 is suppressed by the clip 20. However, when the force to be deformed is accumulated and increased, the spatial volume of the perforation 14 changes, the reflector 1 or the clip 20 is distorted, and an abnormal noise such as a squeak noise due to the distortion is generated. . In particular, abnormal noise often occurs when a liquid crystal display device that turns on / off a fluorescent tube is turned on / off.

This invention is made | formed in view of such a situation, The perforated through-hole row | line | column is provided in the part which does not contact a clip among bending parts, and the perforated part is provided in the part which contacts a clip. An object of the present invention is to provide a light reflection plate and a backlight that can prevent the generation of abnormal noise such as a squeak noise at the clip mounting portion due to heat by not providing the through hole row.

In addition, the present invention provides a light reflecting plate that can be easily bent without providing a perforated through-hole row by providing a groove in a portion of the bent portion that contacts the clip. For other purposes.

Another object of the present invention is to provide a light reflecting plate that can prevent the generation of abnormal noise such as a squeak noise in a clip mounting portion due to heat by having a groove in a bent portion.

Another object of the present invention is to provide a light reflecting plate capable of efficiently reflecting light from a fluorescent tube by alternately having a flat plate portion and a U-shaped portion in cross section. .

The present invention, by providing a through hole in the flat plate portion in contact with the clip, by inserting the projections clip has the through-holes, to provide a light reflection plate that can be attached to the chassis For other purposes.

Light reflecting plate according to the present invention is mounted to the chassis by a clip, in the light reflector having a bent portion which partially contacts the clip, of the bent portion, the through perforations like in a portion not in contact with the clip A hole row is provided, and a perforated through-hole row is not provided in a portion in contact with the clip.

The light reflecting plate according to the present invention is characterized in that a groove is formed in a portion of the bent portion that comes into contact with the clip.

Light reflecting plate according to the present invention, the clip is attached to the chassis by the light reflecting plate having a bent portion which partially contacts the clip, and having a groove in the bent portion.

The light reflecting plate according to the present invention is characterized in that it has alternately flat plate portions and cross-section-shaped portions.

The light reflecting plate according to the present invention is characterized in that a through hole is provided in a flat plate portion in contact with the clip.

The backlight according to the present invention includes the light reflecting plate according to the present invention and a fluorescent tube, and is configured to reflect light from the fluorescent tube by the light reflecting plate.

In the present invention, the portion of the bent portion that does not contact the clip is provided with a perforated through hole row, but the portion that is in contact with the clip is not provided with a perforated through hole row, The bent portion in contact with the clip is not largely thermally deformed, and the light reflection plate or the clip is not distorted, and the generation of abnormal noise such as squeak noise due to the distortion can be prevented.

  In the present invention, since the groove has a groove in the bent portion in contact with the clip, it can be easily bent along the groove without providing a perforated through-hole row.

In the present invention, since the bent portion has a groove, the bent portion that comes into contact with the clip is not largely thermally deformed, the light reflector or the clip is not distorted, and generation of abnormal noise such as squeak noise due to the distortion can be prevented. . Further, it is possible to easily perform bending along the groove without providing a perforated through-hole array.

  In the present invention, since the flat plate portions and the cross-sectionally shaped U-shaped portions are alternately arranged, a fluorescent lamp is disposed above the flat plate portion sandwiched between the cross-shaped cross-shaped portions so that light from the fluorescent tube can be efficiently transmitted. It becomes possible to reflect.

In the present invention, since the through hole is provided in the flat plate portion in contact with the clip, the protrusion of the clip is inserted into the through hole, the inserted protrusion is fitted into the through hole of the chassis, and the light reflection plate Can be attached to the chassis.

According to the present invention, the bent portion in contact with the clip is not largely thermally deformed, so that the light reflecting plate or the clip is not distorted, and generation of abnormal noise such as squeak noise due to the distortion can be prevented.

  According to the present invention, folding can be easily performed without providing a perforated through-hole array.

  According to the present invention, it is possible to efficiently reflect the light from the fluorescent tube by disposing the fluorescent lamp above the flat plate portion sandwiched between the U-shaped portions.

According to the present invention, it is possible to attach the light reflecting plate to the chassis by inserting the protrusion of the clip into the through hole.

Hereinafter, the present invention will be specifically described with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a perspective view showing an example of a reflector according to the present invention. The reflection plate 10 includes a flat plate portion 10a on which the fluorescent tube is disposed, and a protruding portion 10b that is bent in a dogleg shape between the flat plate portions. The reflecting plate 10 is attached to the chassis 30 by a clip 20 having the same shape as the protruding portion 10b and the flat plate portion 10a. Specifically, the flat plate portion 10a of the reflecting plate 10 and the chassis 30 are provided with through holes 16 so that the positions thereof overlap each other, and a mounting protrusion 22 whose tip is formed in a barb shape is provided on the back side of the clip 20. The clip 20 is attached to the chassis 30 so as to sandwich the reflector 10 therebetween by pushing the attachment protrusion 22 into the through hole 16.

  The reflector 10 is made of plastic such as foamed PET having a thickness of about 1 mm for weight reduction. As a method of bending the plastic reflector 10, a perforated through-hole array (hereinafter referred to as a perforation) 14 or a groove 12 is formed in a bent portion of a flat reflector, and the perforation 14 or the groove 12 is formed. It is bent along. The groove 12 is formed in a bent portion of a portion to which the clip 20 is attached (portion in contact with the clip 20) in the entire reflector plate 10, and the perforation 14 is formed in the other bent portion.

  2 is an enlarged cross-sectional view of the main part of the reflector 10, FIG. 2 (a) is a cross-sectional view of the perforation 14 portion, and FIG. 2 (b) is a cross-sectional view of the groove 12 portion. The perforation 14 penetrates the reflector 14, but the groove 12 does not penetrate the reflector 14. Therefore, the spatial volume of the perforation 14 can be changed, but the spatial volume of the groove 12 cannot be changed so much.

  FIG. 3 is a schematic diagram showing a main configuration of a liquid crystal display device using a backlight including the reflector 10. In the backlight, the reflection plate 10 is mounted on the chassis 30 by a clip 20 (not shown), and a fluorescent tube 32 is disposed above the flat plate portion 10a of the reflection plate 10. The fluorescent tube 32 can be supported by, for example, a support provided on the clip 20 and the support. A diffusion plate 34 is disposed above the fluorescent tube 32, and a liquid crystal panel is disposed further above. The diffusing plate 34 can be supported on the support protrusion by providing the clip 20 with a support protrusion, for example.

  The reflector 10 is irradiated with light from the fluorescent tube 32, and heat is applied, so that deformation due to heat occurs. 4 (a) and 4 (b) are cross-sectional views taken along the line XX of FIG. 1, FIG. 4 (a) shows a state before thermal deformation occurs, and FIG. 4 (b) shows thermal deformation. Indicates the state. When thermal deformation occurs, the volume of the reflector 10 changes, and a force due to the volume change is applied to the perforation 14, so that the spatial volume of the perforation 14 changes.

  On the other hand, in the portion where the clip 20 is attached, the spatial volume of the groove 12 does not change much. Therefore, the space volume of the perforation 14 changes when the force to be deformed by heat accumulated in the perforation 14 portion increases when the perforation 14 is provided in the attachment portion of the clip 20. Therefore, there is no problem that the reflector 10 or the clip 20 is distorted and abnormal noise such as squeak noise due to the distortion is generated.

  In the above-described embodiment, the case where the groove 12 is mainly formed in the bent portion of the attachment portion of the clip 20 has been described as an example. However, the groove 12 can be formed at an arbitrary position of the reflector 10. is there. For example, when both short sides of the reflecting plate 10 are supported by a fixture, the grooves 12 can be formed in the bent portions near both short sides of the reflecting plate 10. 5 and 6 are perspective views showing other examples of the reflector according to the present invention. In the example of FIG. 5, the groove 12 is formed in the clip 20 mounting portion of the reflector 11 and the bent portion of the short side portion. Moreover, as shown in FIG. 6, it is also possible to form the groove | channel 12 in the whole, without forming perforation in the bending part of the reflecting plate 10. As shown in FIG.

  In each of the above-described embodiments, the liquid crystal display panel has been described as an example. However, the backlight using the reflector of the present invention can be used in any device. Moreover, the reflector of this invention can be used for the arbitrary apparatuses which reflect light.

It is a perspective view which shows the example of the reflecting plate which concerns on this invention. It is a principal part expanded sectional view of a reflecting plate. It is a schematic diagram which shows the principal part structure of the liquid crystal display device using a backlight provided with a reflecting plate. FIG. 2 is a sectional view taken along line XX in FIG. 1. It is a perspective view which shows the other example of the reflecting plate which concerns on this invention. It is a perspective view which shows the other example of the reflecting plate which concerns on this invention. It is a perspective view which shows the example of the conventional reflecting plate. FIG. 8 is a sectional view taken along line YY in FIG. 7.

Explanation of symbols

10, 11, 40 Reflector 12 Groove 14 Perforation 16 Through hole 20 Clip 22 Mounting protrusion 30 Chassis 32 Fluorescent tube 34 Diffuser 36 Liquid crystal panel

Claims (6)

In the light reflector having a bent portion attached to the chassis by a clip and partially contacting the clip,
Of bent portion, the portions not in contact with the clip is provided with a through-hole rows of the perforated line, a light reflecting plate, characterized in that the portion in contact with the clip not provided a through-hole rows of perforated line . The light reflecting plate according to claim 1, wherein a groove is formed in a portion of the bent portion that contacts the clip. In the light reflector having a bent portion attached to the chassis by a clip and partly contacting the clip,
A light reflector having a groove in a bent portion. The light reflecting plate according to claim 1, wherein the light reflecting plate has alternating flat plate portions and cross-section-shaped portions. The light reflecting plate according to claim 4, wherein a through hole is provided in a flat plate portion in contact with the clip. And one of the light reflection plate any one of claims 1 to 5, and a fluorescent tube, a backlight, characterized in that the light from the fluorescent tube is arranged to reflected by the light reflector.

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