JP4280180B2 - Backlight device - Google Patents

Description

  The present invention relates to a backlight device used as a light source for a liquid crystal television or the like, and in particular, in a support structure for locking an optical sheet constituting the backlight device to a pin, the backlash of a locking hole formed in the optical sheet is reduced. Thus, the present invention relates to a backlight device that does not generate scratches or blurs due to backlash of the locking holes.

  Conventionally, a backlight device used for a liquid crystal display device such as a liquid crystal television has a diffusion plate made of an acrylic plate or the like disposed in front of a fluorescent lamp as a light source, and an ITO sheet, a diffusion film, a prism sheet, a reflective polarizing film in front of the diffusion plate. An optical sheet such as is arranged. In particular, when the irradiation surface of the backlight device is vertically supported, pins are protruded from the four corners of the abutting surface of the reflector base plate with which the end of the diffuser plate abuts, and holes are similarly formed at the four corners. The diffusing plate and each optical sheet were locked to the pins, and the diffusing plate and the optical sheet were held suspended by their own weight.

As shown in FIG. 5 and FIG. 6, the locking holes 2 formed at the four corners of the optical sheet 1 conventionally have the workability when inserting and locking the pins 3 in the optical sheet, and the optical sheet 1. In consideration of misalignment due to thermal expansion, the pin 3 was formed in a horizontally long cabcell shape larger than the outer diameter of the pin 3. In addition, there exists patent document 1 as a prior art of the attachment of an optical sheet.
JP-A-11-281966

  As described above, conventionally, since the locking hole larger than the outer diameter of the pin is formed in the optical sheet, the locking hole is caused by vibration generated during transportation of a product such as a liquid crystal television in which the backlight device is incorporated. There were scratches and cosmetics on the part. Therefore, the present invention relates to an optical sheet that has a shape that does not cause scratches or scrapes during transportation, does not impair the workability when inserted through a pin, and can cope with the thermal expansion of the optical sheet. The purpose was to propose a backlight device with a stop hole.

In order to solve the above problems, the present invention provides a light source disposed in a shallow box-shaped housing supported in a vertical direction, and pins projecting from at least four corners of the front surface of the housing. in the diffusion plate and backlight device where the optical sheet engaged with the pin, the pin with fitted without clearance on the formed at least four corners of the optical sheet engaging hole, the locking hole to the outside of the locking hole And a continuous cut.

Further, the present invention provides a light source disposed inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing so that a diffuser plate and optical In the backlight device in which the sheet is locked , the pin is fitted into the locking holes formed at least at the four corners of the optical sheet without gaps , and the cut hole parallel to the thermal expansion direction of the optical sheet is the locking hole It is formed continuously on both sides of the locking hole .

Further, the present invention provides a light source disposed inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing so that a diffuser plate and optical engaging the backlight device locking the seat, said pin with fitted without any clearance in the locking hole formed on at least four corners of the optical sheet, the three or more cut radially outward of the locking hole It is formed continuously with the hole .

Further, the present invention provides a light source disposed inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing so that a diffuser plate and optical In the backlight device in which the sheet is locked , the pins are fitted into the locking holes formed at least at the four corners of the optical sheet without gaps , and four cuts in an X shape are formed outside the locking holes. It is formed continuously with the locking hole .

  Further, the present invention provides a light source disposed inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing so that a diffuser plate and optical In the backlight device in which the sheet is locked, the locking holes formed in at least four corners of the optical sheet are formed in a rhombus in which the outer diameter of the pin is inscribed, and the longer diagonal line of the rhombus is defined as the heat of the optical sheet. Parallel to the direction of expansion.

Further, the present invention provides a light source disposed inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing so that a diffuser plate and optical in the backlight device locking the seat, said pin engaging hole formed in at least four corners causes fitted without any clearance of the optical sheet, one of the locking hole with respect locking hole, A cut line is formed continuously on the line connecting the center of the other locking hole and the center of the reference locking hole and on both sides of the other locking hole on the extended line.

  As described above, according to the present invention, the inner diameters of the locking holes formed at least at the four corners of the optical sheet are made substantially the same as the outer diameter of the pin to be locked, and a cut is formed on the outer side of the locking hole. As a result, when the pin is inserted into the optical sheet in the assembly process, workability is not impaired because the cut is widened. Further, in the state where the optical sheet is locked to the pins, there is no backlash, so that the occurrence of scratches and scouring is eliminated even if vibration is applied during transportation. Furthermore, even if the optical sheet is heated and heated while the backlight device is turned on, the cut is expanded by the amount of the expansion, and the expansion is absorbed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a first embodiment of a locking portion of an optical sheet of a backlight device according to the present invention. As shown in the drawing, locking holes 16 to 19 are provided at the four corners of the optical sheet 11 corresponding to the locking pins 12 to 15 protruding from the casing (not shown) side of the backlight device. Is formed. The diameters of the locking holes 16 to 19 are formed to be substantially the same as the outer diameters of the pins 12 to 15, and there is no gap when the pins 12 to 15 are inserted into the locking holes 16 to 19. Further, the locking holes 16 to 19 are each formed with a cut on both sides, and the direction of the cut is a horizontal direction in the locking holes 16 and 17, and an obliquely inclined inward in the locking holes 18 and 19. Direction.

  Referring to the direction of this break, when the ambient temperature rises due to the lighting of the backlight device, the optical sheet 11 is relative to the housing (not shown) in which the pins 12 to 15 are projected due to the difference in expansion coefficient. Swell. If the reference point at the time of expansion is the intermediate position between the pins 12 and 13, each of the locking holes 16 to 19 expands and moves on the radiation centered on that position. As a result, in each of the locking holes 16 to 19, by forming a cut on the radiation, the pins 12 to 15 move relatively along the cut at the time of thermal expansion, and the movement is performed for each cut. It is absorbed by slightly turning up the end of this, and it is avoided that an excessive load is applied to the locking holes 16 to 19 themselves.

  FIG. 2 is a front view showing a second embodiment of the locking portion of the optical sheet of the backlight device according to the present invention. As shown in the drawing, locking holes 26 to 29 are provided at the four corners of the optical sheet 21 corresponding to the locking pins 22 to 25 protruding from the casing (not shown) side of the backlight device. Is formed. The diameters of the locking holes 26 to 29 are formed to be substantially the same as the outer diameters of the pins 22 to 25. When the pins 22 to 25 are inserted into the locking holes 26 to 29, there is no gap. Further, the locking holes 26 to 29 are formed with cuts in four directions in an X shape.

  In the case of this embodiment, as in the case of FIG. 1, when the ambient temperature rises due to the lighting of the backlight device, a housing (not shown) in which the pins 22 to 25 are projected due to the difference in expansion coefficient In contrast, the optical sheet 21 expands relatively. If the reference point at the time of expansion is the intermediate position between the pins 22 and 23, the locking holes 26 to 29 expand and move on the radiation centering on the position. As a result, since the cuts are formed in the respective locking holes 26 to 29, the pins 22 to 25 move relatively to the reference point side during thermal expansion, and the movement slightly turns up the ends of the cuts. It is avoided that an excessive load is applied to the locking holes 26 to 29 themselves.

  FIG. 3 is a front view showing a third embodiment of the locking portion of the optical sheet of the backlight device according to the present invention. As shown in the drawing, at the four corners of the optical sheet 31, locking holes 36 having a diamond shape corresponding to the locking pins 32 to 35 protruding on the casing (not shown) side of the backlight device. -39 are formed. The outer diameters of the pins 32 to 55 are formed inside the locking holes 36 to 39 so that there is no gap when the pins 32 to 35 are inserted into the locking holes 36 to 39. Further, the longer diagonal line of the locking holes 36 to 39 having a rhombus shape is a horizontal direction in the locking holes 36 and 37 and an oblique direction inclined inward in the locking holes 38 and 39.

  Referring to the direction of the longer diagonal line of the rhombus, when the ambient temperature rises due to the lighting of the backlight device, the case where the pins 32 to 35 protrude from the housing (not shown) due to the difference in expansion coefficient. The optical sheet 31 is relatively expanded. If the reference point at the time of expansion is the intermediate position between the pins 32 and 33, the locking holes 36 to 39 expand and move on the radiation centered on the position. As a result, in each of the locking holes 36 to 39, the longer diagonal line of the rhombus is arranged on the radiation, so that the pins 32 to 35 are relatively moved along the longer diagonal line at the time of thermal expansion. The movement is absorbed by slightly turning up a part of the side of each rhombus, and it is avoided that an excessive load is applied to the locking holes 36 to 39 themselves.

  FIG. 4 is a front view showing a fourth embodiment of the locking portion of the optical sheet of the backlight device according to the present invention. As shown in the figure, locking holes 46 to 49 are provided at the four corners of the optical sheet 41 corresponding to the locking pins 42 to 45 protruding from the casing (not shown) side of the backlight device. Is formed. The diameters of the locking holes 46 to 49 are formed to be substantially the same as the outer diameters of the pins 42 to 45, and there is no gap when the pins 42 to 45 are inserted into the locking holes 46 to 49. Further, the locking holes 47 to 49 except for the locking hole 46 are formed with cuts on both sides, and the direction of the cut is horizontal in the locking hole 47 and vertical in the locking hole 48. Yes, the locking hole 49 is inclined inwardly.

  Referring to the direction of this break, when the ambient temperature rises due to the lighting of the backlight device, the optical sheet 41 is relative to the housing (not shown) in which the pins 42 to 45 are projected due to the difference in expansion coefficient. Swell. If the reference point at the time of expansion is the position of the pin 42, each of the locking holes 47 to 49 expands and moves on the radiation centered on that position (broken arrow in the figure). As a result, in each of the locking holes 47 to 49, by forming a cut on the radiation, the pins 43 to 45 move relatively along the cut at the time of thermal expansion, and the movement is performed on each cut. It is absorbed by slightly turning up the end of this, and it is avoided that an excessive load is applied to the locking holes 46 to 49 themselves.

  In each of the above-described embodiments, the description has been given of the case where the locking pins project at the four corners of the front surface of the housing, and the optical sheet having the locking holes formed at the four corners is locked thereto. By increasing the size of the device, the number of pins and locking holes may be five or more, and in that case as well, it is possible to cope by forming a cut or the like in the locking holes.

  The present invention can be used for other optical devices and apparatuses having a structure for supporting an optical sheet in an atmosphere where the temperature fluctuates, in addition to the backlight device.

It is a front view which shows 1st Embodiment of the latching | locking part of the optical sheet of the backlight apparatus which concerns on this invention. It is a front view which shows 2nd Embodiment of the latching | locking part of the optical sheet of the backlight apparatus which concerns on this invention. It is a front view which shows 3rd Embodiment of the latching | locking part of the optical sheet of the backlight apparatus which concerns on this invention. It is a front view which shows 4th Embodiment of the latching | locking part of the optical sheet of the backlight apparatus which concerns on this invention. It is a figure which shows a prior art example. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Optical sheet 12-15 pin 16-19 Locking hole 21 Optical sheet 22-25 Pin 26-29 Locking hole 31 Optical sheet 32-35 Pin 36-39 Locking hole 41 Optical sheet 42-45 Pin 46-49 Blind hole

Claims (6)

A light source is arranged inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing, and a diffusion plate and an optical sheet are engaged with the pins. In the light device,
At least four corners the pin locking hole formed in conjunction with fitted without a gap, a backlight apparatus characterized by forming a cut which is continuous with the locking hole to the outside of the locking hole of the optical sheet. A light source is arranged inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at four corners of the front surface of the housing, and a diffusion plate and an optical sheet are locked to the pins. In the light device,
Wherein said pin retaining holes formed in at least four corners causes fitted without any clearance of the optical sheet, the thermal expansion parallel to the direction break in the optical sheet contiguous with the locking holes on each side of the locking hole A backlight device formed. A light source is arranged inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing, and a diffusion plate and an optical sheet are engaged with the pins. In the light device,
Wherein with fitted without a gap the pin locking hole formed on at least four corners of the optical sheet, that at least three cut radially outward of the locking hole formed continuously with the locking hole Backlight device characterized. A light source is arranged inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing, and a diffusion plate and an optical sheet are engaged with the pins. In the light device,
Wherein said pin retaining holes formed in at least four corners causes fitted without any clearance of the optical sheet, it is formed by four cuts outside of the locking hole in an X shape continuous with the locking hole A backlight device characterized by. A light source is arranged inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing, and a diffusion plate and an optical sheet are engaged with the pins. In the light device,
The locking holes formed in at least four corners of the optical sheet are rhombus in which the outer diameter of the pin is inscribed, and the longer diagonal of the rhombus is parallel to the thermal expansion direction of the optical sheet, Backlight device to do. A light source is arranged inside a shallow box-shaped housing supported in the vertical direction, and pins are provided to project at least at the four corners of the front surface of the housing, and a diffusion plate and an optical sheet are engaged with the pins. In the light device,
Wherein said pin retaining holes formed in at least four corners causes fitted without any clearance of the optical sheet, one of the locking hole with respect locking hole, the reference center of the other engaging hole A backlight device characterized in that cuts are formed on both sides of the other locking holes on the line segment connecting the centers of the locking holes and on the extended line thereof.

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