US20070081112A1 - Back light unit for liquid crystal display device and method for manufacturing the unit - Google Patents
Back light unit for liquid crystal display device and method for manufacturing the unit Download PDFInfo
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- US20070081112A1 US20070081112A1 US11/637,183 US63718306A US2007081112A1 US 20070081112 A1 US20070081112 A1 US 20070081112A1 US 63718306 A US63718306 A US 63718306A US 2007081112 A1 US2007081112 A1 US 2007081112A1
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- Prior art keywords
- guide plate
- light guide
- sheet
- sheets
- pin
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
Definitions
- the present invention relates to a structure of a back light unit arranged at rear surface of a back light type liquid crystal display device and a method for manufacturing the unit.
- a back light type liquid crystal display device is constructed so that a light guide plate made of transparent synthetic resin such as acryl is provided at rear side thereof and light from a light source arranged at one end surface or both end surfaces of the light guide plate is scattered to whole liquid crystal display device through the light guide plate.
- a reflective sheet is laminated at a rear surface opposite to the liquid crystal display device among the light guide plate, on the other hand, at a surface of the liquid crystal display device among the light guide plate, a brightness rising sheet is laminated at least one light diffusion sheet made of synthetic resin, or the light diffusion sheets are laminated in layers as the need arises.
- At least one light diffusion sheet, the light diffusion sheet and the brightness rising sheet, or the reflective sheet laminated on the light guide plate is fixed on the light guide plate.
- Japanese Patent Laid-Open Hei 7-043713 of the related art proposes to drive a metal sticking member such as eyelet into the light guide plate so as to reach the light guide plate passing through the various kind of sheets by ultrasonic vibration as the method fixing light diffusion sheet, the light diffusion sheet and the brightness rising sheet, or the reflective sheet.
- the method by the related art makes not only the cost for fixing but also cost for the production of the back light unit increase considerably because the metal sticking member such as eyelet is provided particularly and the metal sticking member is driven into the light guide plate. Further, there is a problem that thickness of the back light unit increases, the size becomes large, and the weight remarkably increase because a head portion of the driven sticking member projecting from the surface of the sheet.
- the back light unit of the invention is characterized by laminating at least one sheet member chosen from a group of a light diffusion sheet, the light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, wherein the sheet member is welded to the light guide plate by press-fitting a pin provided at a horn for ultrasonic welding to the depth reaching the light guide plate breaking through from the sheet member from surface side of the sheet member.
- a method for manufacturing a back light unit of the invention comprises the steps of laminating at least a sheet member chosen from a group of a light diffusion sheet, a light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, and press-fitting a pin provided at a horn for ultrasonic welding to the depth reaching the light guide plate breaking through from the sheet member from surface side of the sheet member.
- the pin provided at the horn for ultrasonic welding is press-fitted to depth reaching the light guide plate breaking through the various kind of sheets from surface side thereof.
- a hollow hole is formed at a laminating body of the light guide plate and various kind of sheets caused of breaking through by ultrasonic vibration, a part contacting the pin among the various kind of sheets is pushed into the hollow hole drawing out, and a part of the light guide plate melts, exudes, and welds to the various kind of sheets. Therefore, the various kind of sheets and the light guide plate are welded surely and strongly in the hollow hole even if the various kind of sheets and the light guide plate are synthetic resin different in kind.
- the invention since various kind of sheets are fixed to the light guide plate surely and strongly without using metal fixing member as the related art, the invention does not cause large size and heavy weight and has advantages reducing drastically not only the cost for the fixing but also product cost of the back light unit.
- the taper pin can be drown easily from the state pushing into various kind of sheets and the light guide plate. Therefore, since drawing out various kind of sheets is avoided at drawing the taper pin, reliability of welding in the hollow hole and welding strength are further improved.
- Another back light unit of the invention is characterized by laminating at least one sheet member chosen from a group of a light diffusion sheet, a light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, wherein a pin constructed in thin nose so as to beak through the sheet member laminated on the surface of the light guide plate is provided integratedly on the light guide plate, and the sheet member are fixed on the light guide plate by distorting of a tip end of the pin by caulking using ultrasonic vibration.
- Another method for manufacturing a back light unit of the invention comprises the steps of providing a pin constructed in thin nose integratedly on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device so as to project from the surface of the plate, laminating at least a sheet member chosen from a group of a light diffusion sheet, a light diffusion sheet and a brightness rising sheet, and a reflective sheet so that the pins break through these various kind of sheets, and distorting of a tip end of the pin by caulking using a horn for ultrasonic welding.
- the pin penetrating the various kind of sheets (sheet member) laminated on the surface of the light guide are provided integratedly on the light guide plate, and tip end of the pin is distorted by caulking using the horn for ultrasonic welding.
- the distortion fixing of the various kind of sheet to the light guide plate is performed in shorter time than the case that the tip end of the pins are distorted by caulking using iron member heated in high temperature, and the various kind of sheets are welded surely and strongly even if the various kind of sheets are synthetic resin different in kind from the light guide plate.
- the pins melt from the tip end of thin nose at distorting the tip end of the pin by caulking while melting by ultrasonic vibration. Because of that, a part of root to the light guide plate among the entire pin starts to melt early, and melting resin of the pin invades between the various kind of sheets and the light guide plate, and between mutual various kind of sheets, it is surely prevented that space thereby generates between the various kind of sheets and the light guide plate, and between mutual various kind of sheets.
- space does not generate between the various kind of sheets and the light guide plate, and between mutual various kind of sheets even if the various kind of sheets are different synthetic resin in kind from the light guide plate, further, the various kind of sheets are fixed surely and strongly to the light guide plate without causing weight-up.
- FIG. 1 is a perspective view of an exploded state of a back light unit.
- FIG. 2 is an enlarged sectional view showing a state laminating various kind of sheets on a light guide plate.
- FIG. 3 is an enlarged sectional view showing a state fixing the various kind of sheets on the light guide plate.
- FIG. 4 is a perspective view of the back light unit.
- FIG. 5 is an enlarged sectional view viewed from V-V of FIG. 4 .
- FIG. 6 is a perspective view of an exploded state of a back light unit.
- FIG. 7 is an enlarged sectional view viewed from II-II of FIG. 6 .
- FIG. 8 is an enlarged sectional view showing a state laminating the various kind of sheets on the light guide plate.
- FIG. 9 is an enlarged sectional view showing a state fixing the various kind of sheets on the light guide plate.
- FIG. 10 is a perspective view of the back light unit.
- FIG. 11 is an enlarged sectional view viewed from VI-VI of FIG. 10 .
- FIG. 12 is an enlarged sectional view showing another mode for carrying out.
- FIG. 1 to FIG. 5 A mode for carrying out the invention will be described referring FIG. 1 to FIG. 5 .
- symbol 1 shows a light guide plate made of transparent synthetic resin such as acryl
- symbol 2 shows a light diffusion sheet laminated surface side of the synthetic resin 1
- symbol 3 shows a brightness rising sheet laminated on the light diffusion sheet 2 in layers.
- Symbol 4 shows a reflective sheet laminated at rear surface side of the light guide plate 1 .
- a pin 6 of about 0.5 to 1 mm in diameter D at a horn for ultrasonic welding is press-fitted to the various kind of sheets 2 and 3 as shown in FIG. 2 .
- the pin 8 is pushed into the depth reaching the light guide plate 1 breaking through the various kind of sheets 2 and 3 as shown in FIG. 3 .
- a hollow hole 7 is formed at a laminating body of the various kind of sheets 2 and 3 and the light guide plate 1 , a part contacting the pin 6 among the various kind of sheets 2 and 3 is pushed into the hollow hole 7 drawing out, and a part of the light guide plate 1 melts, exudes, and welds to the various kind of sheets 2 and 3 . Therefore, the various kind of sheets 2 and 3 and the light guide plate 1 are welded surely in the hollow hole 7 .
- the welding is performed at a part close to one side surface 3 a of the light guide plate 1 at plural places along the one side surface 3 a as shown in FIG. 4 without performing at both, right and left, side faces 3 a and 3 b of the plate.
- the light diffusion of sheet 2 and the brightness rising sheet 3 are fixed surely with the state not shifting sideways to the light guide 1 , and it is avoided to generate wrinkles at the diffusion sheet 2 and the brightness rising sheet 3 because of difference of thermal expansion with the light guide plate 1 .
- the welding may be performed at close to both, right and left, side faces 3 a and 3 b of the light guide plate 1 .
- the welding is performed similarly as the above-mentioned as shown in FIG. 5 .
- the pin 6 provided at the horn 5 for ultrasonic welding is drawn after press-fitting to the depth reaching the light guide 1 breaking through the various kind of sheets 2 and 3 .
- welding strength of the various kind of sheets 2 and 3 to the light guide plate 1 is possibly decreased because there is tendency to draw up various kind of sheets 2 and 3 .
- the invention proposes to construct the pin 6 provided at the horn 5 for ultrasonic welding in taper shape of thin nose as shown in the figure.
- FIG. 6 to FIG. 12 Another embodiment of the invention will be described referring FIG. 6 to FIG. 12 .
- symbol 21 shows a light guide plate made of transparent synthetic resin such as acryl
- symbol 22 shows a light diffusion sheet laminated surface side of the synthetic resin 21
- symbol 23 shows a brightness rising sheet laminated on the light diffusion sheet 22 in layers.
- Symbol 24 shows a reflective sheet laminated at rear surface side of the light guide plate 21 .
- pins 25 constructed in taper shape of thin nose are projected integratedly at a part portion close to one side surface 21 a of the light guide plate 21 and at two part portions along the one side surface 21 a , and holes 22 a and 22 b where the both pins 25 of the two light diffusion sheets 22 and the brightness rising sheet 23 are fitted in are made.
- the tip end of the pins 25 are pressed to axial direction at the condition applying ultrasonic vibration contacting a horn for ultrasonic welding.
- the tip end of thin nose of the pin 25 melts earlier than a part of root to the light guide plate 21 among the pin 25 and is distorted by caulking in flat shape (the part distorted by caulking is shown with symbol 25 a ) as shown in FIG. 9 , thereby the various kind of sheets 22 and 23 are fixed surely and strongly to the light guide plate 21 .
- the tip end of thin nose of the pin 25 melts, crushes, and distorts earlier than the root portion among the entire pin 25 to the light guide plate 21 . Because of that, it is avoided that the root portion melts earlier and the melting resin of the pin invades between the light guide plate 21 and the various kind of sheets 22 and 23 , and between mutual various kind of sheets 22 and 23 , thereby it is surely prevented that space generates between the various kind of sheets 22 and 23 and the light guide plate 21 , and between mutual various kind of sheets 22 and 23 at distorting the pin 25 by caulking using ultrasonic wave.
- the light diffusion sheet 22 and the brightness rising sheet 23 are fixed surely with the state not shifting sideways to the light guide 21 , and it is surely avoided to generate wrinkles at the light diffusion sheet 22 and the brightness rising sheet 23 because of difference of thermal expansion with the light guide plate 21 at distorting the tip end of the pin melting by ultrasonic vibration.
- the welding by the pin 25 may be performed at close to both, right and left, side faces 21 a and 21 b of the light guide plate 21 .
- the welding is performed similarly as the above-mentioned as shown in FIG. 11 .
- a stepped pin 25 ′ having small diameter only at tip end may be constructed as shown in FIG. 12 without limiting to the taper shape of thin nose.
- working efficiency laminating the various kind of sheets 22 and 23 on surface of the light guide plate 21 so that the pins 25 fit into each of holes 22 a and 23 a can be improved.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Planar Illumination Modules (AREA)
Abstract
A pin 6 provided at a horn 5 for ultrasonic welding is press-fitted to the depth reaching the light guide plate 1 breaking through the various kind of sheets 2 and 3 from surface side thereof.
Another embodiment of the invention is that pins 25 constructed so as to break through various kind of sheets 22 and 23 on the surface of the plate are provided on the light guide plate 21, and the various kind of sheets 22 and 23 are fixed on the light guide plate 1 by distorting by caulking using ultrasonic vibration of the tip end of the pin.
Description
- 1. Field of the Invention
- The present invention relates to a structure of a back light unit arranged at rear surface of a back light type liquid crystal display device and a method for manufacturing the unit.
- 2. Description of the Related Art
- Generally, a back light type liquid crystal display device is constructed so that a light guide plate made of transparent synthetic resin such as acryl is provided at rear side thereof and light from a light source arranged at one end surface or both end surfaces of the light guide plate is scattered to whole liquid crystal display device through the light guide plate. A reflective sheet is laminated at a rear surface opposite to the liquid crystal display device among the light guide plate, on the other hand, at a surface of the liquid crystal display device among the light guide plate, a brightness rising sheet is laminated at least one light diffusion sheet made of synthetic resin, or the light diffusion sheets are laminated in layers as the need arises.
- In this case, at least one light diffusion sheet, the light diffusion sheet and the brightness rising sheet, or the reflective sheet laminated on the light guide plate is fixed on the light guide plate.
- For fixing, there are a method using adhesive double-coated tape or stickness adhesive and a method welding. The former method using adhesive double-coated tape or stickness adhesive incurs remarkable cost-up because of manual work, and in the later method welding, welding area is small when each sheet is made of synthetic resin material different in kind of the light guide plate, thereby the method can not be applied because of low welding strength.
- Then, Japanese Patent Laid-Open Hei 7-043713 of the related art proposes to drive a metal sticking member such as eyelet into the light guide plate so as to reach the light guide plate passing through the various kind of sheets by ultrasonic vibration as the method fixing light diffusion sheet, the light diffusion sheet and the brightness rising sheet, or the reflective sheet.
- However, the method by the related art makes not only the cost for fixing but also cost for the production of the back light unit increase considerably because the metal sticking member such as eyelet is provided particularly and the metal sticking member is driven into the light guide plate. Further, there is a problem that thickness of the back light unit increases, the size becomes large, and the weight remarkably increase because a head portion of the driven sticking member projecting from the surface of the sheet.
- To achieve the technical object, the back light unit of the invention is characterized by laminating at least one sheet member chosen from a group of a light diffusion sheet, the light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, wherein the sheet member is welded to the light guide plate by press-fitting a pin provided at a horn for ultrasonic welding to the depth reaching the light guide plate breaking through from the sheet member from surface side of the sheet member.
- A method for manufacturing a back light unit of the invention comprises the steps of laminating at least a sheet member chosen from a group of a light diffusion sheet, a light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, and press-fitting a pin provided at a horn for ultrasonic welding to the depth reaching the light guide plate breaking through from the sheet member from surface side of the sheet member.
- Thus, after laminating various kind of sheets (the sheet member) on the light guide plate, the pin provided at the horn for ultrasonic welding is press-fitted to depth reaching the light guide plate breaking through the various kind of sheets from surface side thereof. By the breaking-through, a hollow hole is formed at a laminating body of the light guide plate and various kind of sheets caused of breaking through by ultrasonic vibration, a part contacting the pin among the various kind of sheets is pushed into the hollow hole drawing out, and a part of the light guide plate melts, exudes, and welds to the various kind of sheets. Therefore, the various kind of sheets and the light guide plate are welded surely and strongly in the hollow hole even if the various kind of sheets and the light guide plate are synthetic resin different in kind.
- That is, according to the invention, since various kind of sheets are fixed to the light guide plate surely and strongly without using metal fixing member as the related art, the invention does not cause large size and heavy weight and has advantages reducing drastically not only the cost for the fixing but also product cost of the back light unit.
- Further, by constructing the pin provided at the horn for ultra sonic welding in taper shape of thin nose, the taper pin can be drown easily from the state pushing into various kind of sheets and the light guide plate. Therefore, since drawing out various kind of sheets is avoided at drawing the taper pin, reliability of welding in the hollow hole and welding strength are further improved.
- Even further, by press-fitting the pin at a part close to one side surface of the light guide plate at plural places along the one side surface, various kind of sheets are fixed surely with the state not shifting sideways to the light guide, and it is avoided to generate wrinkles at the various kind of sheets because of difference of thermal expansion with the light guide plate.
- Another back light unit of the invention is characterized by laminating at least one sheet member chosen from a group of a light diffusion sheet, a light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, wherein a pin constructed in thin nose so as to beak through the sheet member laminated on the surface of the light guide plate is provided integratedly on the light guide plate, and the sheet member are fixed on the light guide plate by distorting of a tip end of the pin by caulking using ultrasonic vibration.
- Another method for manufacturing a back light unit of the invention comprises the steps of providing a pin constructed in thin nose integratedly on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device so as to project from the surface of the plate, laminating at least a sheet member chosen from a group of a light diffusion sheet, a light diffusion sheet and a brightness rising sheet, and a reflective sheet so that the pins break through these various kind of sheets, and distorting of a tip end of the pin by caulking using a horn for ultrasonic welding.
- Thus, in the back light unit, the pin penetrating the various kind of sheets (sheet member) laminated on the surface of the light guide are provided integratedly on the light guide plate, and tip end of the pin is distorted by caulking using the horn for ultrasonic welding. By the distortion, fixing of the various kind of sheet to the light guide plate is performed in shorter time than the case that the tip end of the pins are distorted by caulking using iron member heated in high temperature, and the various kind of sheets are welded surely and strongly even if the various kind of sheets are synthetic resin different in kind from the light guide plate.
- Further, by constructing the pins in thin nose, the pins melt from the tip end of thin nose at distorting the tip end of the pin by caulking while melting by ultrasonic vibration. Because of that, a part of root to the light guide plate among the entire pin starts to melt early, and melting resin of the pin invades between the various kind of sheets and the light guide plate, and between mutual various kind of sheets, it is surely prevented that space thereby generates between the various kind of sheets and the light guide plate, and between mutual various kind of sheets.
- Incidentally, distortion by caulking melting with contact of heating iron generates sheet separation between the various kind of sheets pulling up the distortion portion by caulking caused by sticking of melting resin. However, the horn cools rapidly by stop of ultrasonic vibration at the horn and melting resin does not fix to the horn in the case distorting the tip end of the pin by caulking using the horn for ultrasonic welding, thereby the various kind of sheets are surly fixed without generating sheet separation.
- Therefore, according to the invention, space does not generate between the various kind of sheets and the light guide plate, and between mutual various kind of sheets even if the various kind of sheets are different synthetic resin in kind from the light guide plate, further, the various kind of sheets are fixed surely and strongly to the light guide plate without causing weight-up.
- Further, by arranging the pin at a part close to one side surface of the light guide plate at a plurality of places along the one side surface, various kind of sheets are fixed surely with the state not shifting sideways to the light guide, and it is avoided to generate wrinkles at the various kind of sheets because of difference of thermal expansion with the light guide plate.
-
FIG. 1 is a perspective view of an exploded state of a back light unit. -
FIG. 2 is an enlarged sectional view showing a state laminating various kind of sheets on a light guide plate. -
FIG. 3 is an enlarged sectional view showing a state fixing the various kind of sheets on the light guide plate. -
FIG. 4 is a perspective view of the back light unit. -
FIG. 5 is an enlarged sectional view viewed from V-V ofFIG. 4 . -
FIG. 6 is a perspective view of an exploded state of a back light unit. -
FIG. 7 is an enlarged sectional view viewed from II-II ofFIG. 6 . -
FIG. 8 is an enlarged sectional view showing a state laminating the various kind of sheets on the light guide plate. -
FIG. 9 is an enlarged sectional view showing a state fixing the various kind of sheets on the light guide plate. -
FIG. 10 is a perspective view of the back light unit. -
FIG. 11 is an enlarged sectional view viewed from VI-VI ofFIG. 10 . -
FIG. 12 is an enlarged sectional view showing another mode for carrying out. - A mode for carrying out the invention will be described referring
FIG. 1 toFIG. 5 . - In
FIG. 1 ,symbol 1 shows a light guide plate made of transparent synthetic resin such as acryl,symbol 2 shows a light diffusion sheet laminated surface side of thesynthetic resin 1, andsymbol 3 shows a brightness rising sheet laminated on thelight diffusion sheet 2 in layers. -
Symbol 4 shows a reflective sheet laminated at rear surface side of thelight guide plate 1. - After laminating two
light diffusion sheets 2 and onebrightness rising sheet 3 on surface side of thelight guide plate 1 in layers, thesesheets - That is, a
pin 6 of about 0.5 to 1 mm in diameter D at a horn for ultrasonic welding, and thepin 6 is press-fitted to the various kind ofsheets FIG. 2 . By the press-fitting, the pin 8 is pushed into the depth reaching thelight guide plate 1 breaking through the various kind ofsheets FIG. 3 . - By the breaking-through, a
hollow hole 7 is formed at a laminating body of the various kind ofsheets light guide plate 1, a part contacting thepin 6 among the various kind ofsheets hollow hole 7 drawing out, and a part of thelight guide plate 1 melts, exudes, and welds to the various kind ofsheets sheets light guide plate 1 are welded surely in thehollow hole 7. - In the case that the
brightness rising sheet 3 is laminated adding to thelight diffusion sheet 2, the welding is performed at a part close to one side surface 3 a of thelight guide plate 1 at plural places along the one side surface 3 a as shown inFIG. 4 without performing at both, right and left, side faces 3 a and 3 b of the plate. By the welding, the light diffusion ofsheet 2 and thebrightness rising sheet 3 are fixed surely with the state not shifting sideways to thelight guide 1, and it is avoided to generate wrinkles at thediffusion sheet 2 and thebrightness rising sheet 3 because of difference of thermal expansion with thelight guide plate 1. - In the case that wrinkles at the
diffusion sheet 2 and thebrightness rising sheet 3 because of difference ofthermal expansion body 1 do not possibly generate, the welding may be performed at close to both, right and left, side faces 3 a and 3 b of thelight guide plate 1. - At fixing the
reflective sheet 4 to rear surface of thelight guide plate 1, the welding is performed similarly as the above-mentioned as shown inFIG. 5 . - Incidentally, the
pin 6 provided at thehorn 5 for ultrasonic welding is drawn after press-fitting to the depth reaching thelight guide 1 breaking through the various kind ofsheets sheets light guide plate 1 is possibly decreased because there is tendency to draw up various kind ofsheets - About this, the invention proposes to construct the
pin 6 provided at thehorn 5 for ultrasonic welding in taper shape of thin nose as shown in the figure. - By the construction of the taper shaped
pin 6, press-fitting to the depth reaches thelight guide plate 1 breaking trough the various kind ofsheets sheets pin 6 out, reliability of welding and welding strength in the hollow hole are further improved. - Another embodiment of the invention will be described referring
FIG. 6 toFIG. 12 . - In
FIG. 6 ,symbol 21 shows a light guide plate made of transparent synthetic resin such as acryl,symbol 22 shows a light diffusion sheet laminated surface side of thesynthetic resin 21, andsymbol 23 shows a brightness rising sheet laminated on thelight diffusion sheet 22 in layers. -
Symbol 24 shows a reflective sheet laminated at rear surface side of thelight guide plate 21. - After laminating two
light diffusion sheets 22 and onebrightness rising sheet 23 on surface side of thelight guide plate 1 in layers, thesesheets - As shown in
FIG. 6 andFIG. 7 pins 25 constructed in taper shape of thin nose are projected integratedly at a part portion close to oneside surface 21 a of thelight guide plate 21 and at two part portions along the oneside surface 21 a, and holes 22 a and 22 b where the bothpins 25 of the twolight diffusion sheets 22 and thebrightness rising sheet 23 are fitted in are made. - After the two
light diffusion sheets 22 and thebrightness rising sheet 23 are laminated on surface of thelight guide plate 21 so that thepins 25 are fitted into each of theholes FIG. 8 , the tip end of thepins 25 are pressed to axial direction at the condition applying ultrasonic vibration contacting a horn for ultrasonic welding. - Thus, the tip end of thin nose of the
pin 25 melts earlier than a part of root to thelight guide plate 21 among thepin 25 and is distorted by caulking in flat shape (the part distorted by caulking is shown withsymbol 25 a) as shown inFIG. 9 , thereby the various kind ofsheets light guide plate 21. - By making the
pin 25 taper shape of thin nose, the tip end of thin nose of thepin 25 melts, crushes, and distorts earlier than the root portion among theentire pin 25 to thelight guide plate 21. Because of that, it is avoided that the root portion melts earlier and the melting resin of the pin invades between thelight guide plate 21 and the various kind ofsheets sheets sheets light guide plate 21, and between mutual various kind ofsheets pin 25 by caulking using ultrasonic wave. - As described above, by fixing using the
pin 25 at a part close to oneside surface 23 a at plural places along the oneside surface 23 a, thelight diffusion sheet 22 and thebrightness rising sheet 23 are fixed surely with the state not shifting sideways to thelight guide 21, and it is surely avoided to generate wrinkles at thelight diffusion sheet 22 and thebrightness rising sheet 23 because of difference of thermal expansion with thelight guide plate 21 at distorting the tip end of the pin melting by ultrasonic vibration. - In the case that wrinkles at the
diffusion sheet 22 and thebrightness rising sheet 23 caused by difference ofthermal expansion body 21 do not possibly generate, the welding by thepin 25 may be performed at close to both, right and left, side faces 21 a and 21 b of thelight guide plate 21. - At fixing the
reflective sheet 24 to rear surface of thelight guide plate 21, the welding is performed similarly as the above-mentioned as shown inFIG. 11 . - Further, at constructing the
pin 25 in thin nose, a steppedpin 25′ having small diameter only at tip end may be constructed as shown inFIG. 12 without limiting to the taper shape of thin nose. However, when thepin 25 is constructed in taper shape of thin nose, working efficiency laminating the various kind ofsheets light guide plate 21 so that thepins 25 fit into each ofholes
Claims (5)
1. A back light unit for a liquid crystal display device, the back light unit laminating at least a sheet member chosen from a group of a light diffusion sheet, a combination of a light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device,
wherein the sheet member is welded to the light guide plate by press-fitting a pin provided at a horn for ultrasonic welding to the depth reaching the light guide plate breaking through the sheet member from surface side of the sheet member.
2. A method for manufacturing a back light unit for a liquid crystal display device, comprising the steps of:
laminating at least a sheet member chosen from a group of a light diffusion sheet, a combination of a light diffusion sheet and a brightness rising sheet, and a reflective sheet on a light guide plate made of transparent synthetic resin arranged at rear surface side of a liquid crystal display device, and
press-fitting a pin provided at a horn for ultrasonic welding to the depth reaching the light guide plate breaking through from the sheet member from surface side of the sheet member.
3. A method for manufacturing back light unit for a liquid crystal display device according to claim 2 ,
wherein the pin of the horn is formed in taper shape of thin nose.
4. A method for manufacturing back light unit for a liquid crystal display device according to claim 2 ,
wherein the press-fitting of the pin is performed at close to one side surface of the light guide plate at plural places along the one side face.
5-7. (canceled)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/637,183 US20070081112A1 (en) | 2001-04-12 | 2006-12-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPP2001-114003 | 2001-04-12 | ||
JP2001114003A JP2002311420A (en) | 2001-04-12 | 2001-04-12 | Structure of backlight device for liquid crystal display element and its manufacture |
JPP2001-123802 | 2001-04-23 | ||
JP2001123802A JP2002318386A (en) | 2001-04-23 | 2001-04-23 | Structure of backlight device for liquid crystal display element and method for manufacturing the same |
US10/120,770 US7173677B2 (en) | 2001-04-12 | 2002-04-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
US11/637,183 US20070081112A1 (en) | 2001-04-12 | 2006-12-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/120,770 Division US7173677B2 (en) | 2001-04-12 | 2002-04-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
Publications (1)
Publication Number | Publication Date |
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US20070081112A1 true US20070081112A1 (en) | 2007-04-12 |
Family
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Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US10/120,770 Expired - Fee Related US7173677B2 (en) | 2001-04-12 | 2002-04-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
US11/637,183 Abandoned US20070081112A1 (en) | 2001-04-12 | 2006-12-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
US11/656,967 Expired - Fee Related US7307674B2 (en) | 2001-04-12 | 2007-01-24 | Back light unit for liquid crystal display device and method for manufacturing the unit |
Family Applications Before (1)
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US10/120,770 Expired - Fee Related US7173677B2 (en) | 2001-04-12 | 2002-04-12 | Back light unit for liquid crystal display device and method for manufacturing the unit |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US11/656,967 Expired - Fee Related US7307674B2 (en) | 2001-04-12 | 2007-01-24 | Back light unit for liquid crystal display device and method for manufacturing the unit |
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US (3) | US7173677B2 (en) |
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US20110141396A1 (en) * | 2008-09-30 | 2011-06-16 | Sharp Kabushiki Kaisha | Illumination device and liquid crystal display device |
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US8582051B2 (en) * | 2010-06-15 | 2013-11-12 | Lg Innotek Co., Ltd. | Backlight unit and the display device having the same |
KR20140020463A (en) * | 2012-08-08 | 2014-02-19 | 삼성디스플레이 주식회사 | Light guide plate and display device having the same |
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- 2006-12-12 US US11/637,183 patent/US20070081112A1/en not_active Abandoned
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US5978060A (en) * | 1995-11-20 | 1999-11-02 | Sharp Kabushiki Kaisha | Liquid crystal display apparatus and apparatus for manufacturing the same |
US5727862A (en) * | 1996-11-25 | 1998-03-17 | Taiwan Liton Electronic Co., Ltd. | LED back light assembly |
US6333799B1 (en) * | 1997-01-07 | 2001-12-25 | Tellium, Inc. | Hybrid wavelength-interchanging cross-connect |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100008102A1 (en) * | 2008-07-14 | 2010-01-14 | Wintek Corporation | Back light module |
US20110141396A1 (en) * | 2008-09-30 | 2011-06-16 | Sharp Kabushiki Kaisha | Illumination device and liquid crystal display device |
US9925021B2 (en) | 2011-08-29 | 2018-03-27 | David Regev | Dental implant systems and methods for accessing intra cavity areas therethrough |
US10414104B2 (en) * | 2017-03-03 | 2019-09-17 | HELLA GmbH & Co. KGaA | Method for arranging a functional layer on a plastic component, and a composite made thereof |
Also Published As
Publication number | Publication date |
---|---|
US7173677B2 (en) | 2007-02-06 |
US20070121031A1 (en) | 2007-05-31 |
US7307674B2 (en) | 2007-12-11 |
US20020149712A1 (en) | 2002-10-17 |
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Legal Events
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Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |