JP2008060019A - Light guide plate, linear light source device, and surface light-emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide plate, a linear light source device, and a surface light-emitting device capable of irradiating uniform illumination light on an LCD by easy positioning enabled. <P>SOLUTION: In the surface light-emitting device 10 provided with a linear light source device equipped with a long-shape wiring board 310 and a plurality of light-emitting elements 320 arranged on the wiring board 310, and a light guide plate 20 arranged at one side with the linear light source device as a light source, the linear light source device 30 is provided with a first notched part 312 fitted at one side face along a length direction of the wiring board 310 and a second notched part 313 fitted at the other, at either end of the wiring board, and the light guide plate is provided with a first convex part 212 and a second convex part 213 insertion-coupled with the first notched part 312 and the second notched part 313 in protrusion from a side face S1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light guide plate, a linear light source device, and a surface light emitting device that are irradiated from the back side as a light source of illumination light such as a liquid crystal display panel.

As a conventional surface light emitting device, a conventional linear light source device in which a light guide plate is arranged on a liquid crystal display panel (hereinafter referred to as LCD) and a plurality of light emitting elements are arranged on a long wiring substrate. As a light source, one arranged on one side of a light guide plate is known (for example, see Patent Document 1). In the surface light emitting device described in Patent Document 1, the linear light source device is fixed to the light guide plate so as to be sandwiched between the upper reflection sheet and the lower reflection sheet attached to the back side of the light guide plate.
JP 2004-235139 A

  However, in the conventional surface light emitting device, in order to fix the linear light source device to the light guide plate, it is simply pasted so as to be sandwiched between the upper reflective sheet and the lower reflective sheet. There may be a shortage in the width direction of the side surface of the light guide plate due to a shortage or the lower reflection sheet being slightly bent. If the thickness of the light guide plate is large, a slight shift of the linear light source device will not be a problem, but the thickness of the light guide plate is also decreasing as the surface light emitting device is becoming thinner. Therefore, as the thickness of the light guide plate decreases, the light from the linear light source device shifts from the center in the width direction of the side surface of the light guide plate. Therefore, the light cannot be uniformly applied to the LCD, and the display surface is difficult to see.

  Therefore, an object of the present invention is to provide a light guide plate, a linear light source device, and a surface light emitting device that can be easily positioned and can irradiate uniform illumination light onto an LCD.

  The light guide plate of the present invention is a light guide plate in which a linear light source device including a long wiring substrate and a plurality of light emitting elements arranged on the wiring substrate is disposed on one side surface as a light source. A sandwiching portion projecting from the one side surface is provided so as to sandwich the width direction.

  The linear light source device of the present invention includes a long wiring substrate and a plurality of light emitting elements arranged on the wiring substrate, and the linear light source device disposed on one side surface of the light guide plate includes: Is provided with a notch portion that fits into a sandwiching portion that projects so as to sandwich the wiring board from one side surface of the light guide plate.

  A surface light emitting device of the present invention includes a linear light source device including a long wiring substrate and a plurality of light emitting elements arranged on the wiring substrate, and a conductive light source disposed on one side as the linear light source device as a light source. In the surface light emitting device including the light plate, the light guide plate is provided with a sandwiching portion protruding from the one side surface so as to sandwich the width direction of the wiring board.

  In the present invention, since the shift of the linear light source device can be regulated with respect to the width direction of the side surface of the light guide plate, the positioning can be easily performed. Therefore, since the light from the linear light source device can be arranged in alignment with the center in the width direction of the side surface of the light guide plate, it is possible to irradiate the LCD with uniform illumination light.

  A first invention of the present application is a light guide plate in which a linear light source device including a long wiring substrate and a plurality of light emitting elements arranged on the wiring substrate is disposed on one side surface as a light source. A sandwiching portion protruding from one side surface is provided so as to sandwich the direction.

  Since the light guide plate of the present invention is provided with a sandwiching portion protruding from one side so as to sandwich the width direction of the wiring substrate, when the linear light source device is disposed, the width of the wiring substrate is placed in the sandwiching portion. The linear light source device can be prevented from being displaced with respect to the width direction of the side surface of the light guide plate of the present invention by being fixed so as to sandwich the direction.

  The second invention of the present application is characterized in that the sandwiching portion is provided so as to be fitted to the notch portions provided on both side surfaces along the length direction of the wiring board.

  By positioning the clamping part so that it fits into the notch part provided on the wiring board of the linear light source device, not only the width direction of the side surface but also the displacement in the length direction is regulated, so it is more positioned Can be done accurately.

  The third invention of the present application is characterized in that the sandwiching portion is provided on one side surface so as to sandwich both end portions of the wiring board.

  When the sandwiching portion sandwiches both ends of the wiring substrate, the linear light source device can be positioned on the side surface of the light guide plate of the present invention without shifting one of the both ends of the linear light source device.

  According to a fourth aspect of the present invention, there is provided a linear light source device including a long wiring board and a plurality of light emitting elements arranged on the wiring board, and disposed on one side surface of the light guide plate. A notch portion is provided which is fitted to a sandwiching portion protruding so as to sandwich the wiring board from one side surface of the light guide plate.

  Since the notch part which fits the clamping part which protruded from the one side of the light guide plate is provided, the shift in the width direction of the side surface is regulated, so that the linear light source device of the present invention has the width of the side surface of the light guide plate. Deviation from the direction can be prevented. Further, since the notch restricts the shift in the length direction, the positioning can be performed more accurately.

  The fifth invention of the present application is characterized in that the notches are provided at both ends of the wiring board.

  By providing the notches at both ends of the wiring substrate, the linear light source device of the present invention can be positioned on the side surface of the light guide plate without shifting one of the both ends of the linear light source device.

  A sixth invention of the present application includes a linear light source device including an elongated wiring substrate and a plurality of light emitting elements arranged on the wiring substrate, a light guide plate disposed on one side surface using the linear light source device as a light source, and In the surface light emitting device having the above structure, the light guide plate is provided with a sandwiching portion protruding from one side surface so as to sandwich the width direction of the wiring board.

  Since the light guide plate is provided with a sandwiching portion protruding from one side so as to sandwich the width direction of the wiring board, when the linear light source device is disposed, the width direction of the wiring board is sandwiched between the sandwiching parts. By positioning and fixing in this way, it is possible to prevent the side surface of the light guide plate from being displaced in the width direction.

  According to a seventh invention of the present application, the linear light source device is provided with notches provided on both side surfaces along the length direction of the wiring board, and the light guide plate is sandwiched so as to fit into the notches. This is characterized in that a portion is provided.

  By positioning the clamping part so that it fits into the notch part provided on the wiring board of the linear light source device, not only the width direction of the side surface but also the displacement in the length direction is regulated, so it is more positioned Can be done accurately.

  The eighth invention of the present application is characterized in that the clamping portion is provided on one side surface of the light guide plate so as to sandwich both end portions of the wiring board.

  By sandwiching the both end portions of the wiring board by the sandwiching portion of the light guide plate, the linear light source device can be positioned on the side surface of the light guide plate without shifting one of the both end portions of the linear light source device.

  According to a ninth aspect of the present invention, the linear light source device is characterized in that notches are provided at both ends of the wiring board.

  By providing the notches of the linear light source device at both ends of the wiring substrate, the linear light source device can be positioned on the side surface of the light guide plate without shifting one of the both ends of the linear light source device. .

(Embodiment)
A linear light source device and a light guide plate according to an embodiment of the present invention will be described as a surface light-emitting device based on FIGS. FIG. 1 is a perspective view of a surface light emitting device according to an embodiment of the present invention. FIG. 2 is a side view of the linear light source device attached to the light guide plate. FIG. 3 is a perspective view of the linear light source device shown in FIG. 1 viewed from the back side.

  As shown in FIG. 1, the surface light emitting device 10 includes a light guide plate 20, a linear light source device 30, and a flexible printed wiring board (hereinafter referred to as FPC) 40, and the linear light source device 30 is a light source. The light is incident from the side surface S1 of the light guide plate 20 and is emitted as illumination light from the main light emitting surface S2 of the light guide plate while traveling in the light guide plate 20, thereby being used as a backlight of the LCD.

  The light guide plate 20 is, for example, a transparent and rectangular plate formed with an acrylic resin or a polycarbonate resin to a thickness of about 0.3 to 0.5 mm. Positioning portions 210 are provided at both end portions of the side surface S1 serving as the light incident surface of the light guide plate 20.

  The positioning portion 210 is a first protrusion that functions as a space portion 211 formed so as to gradually widen from the width of the side surface S1 and a sandwiching portion that protrudes from the end surface of the space portion 211 and sandwiches the linear light source device 30. A portion 212 and a second convex portion 213 are formed. The first convex portion 212 is located outside the second convex portion 213 and is located below.

  As shown in FIG. 2, the light guide plate 20 includes a lower reflection sheet 51 provided on the back side, a diffusion sheet 52 and prism sheets 53 and 54 provided on the light emitting surface side, and an upper reflection sheet 55. (Not shown in FIG. 1).

  The lower reflection sheet 51 has a function of reflecting the light that passes through the gaps between the reflection / diffusion dots provided on the bottom surface of the light guide plate 20 or the dots or the prism surface in the direction of the diffusion sheet 52. As the lower reflection sheet 51, an ESR (Enhanced Specular Reflector) having a high reflectance in the visible light range due to a multilayer film structure using a polyester resin can be used.

  The diffusion sheet 52 is made of polyester (PS) resin or polycarbonate (PC) resin and has a rough surface like ground glass. The diffusion sheet 52 is formed so as to cover the light emitting surface of the light guide plate 20.

  The prism sheets 53 and 54 have prism surfaces in which triangular strips made of acrylic resin are formed on the surface of a polyester resin. This prism surface is formed in a sawtooth shape in a sectional view. The prism sheets 53 and 54 are arranged so that the strip directions overlap in a direction substantially orthogonal to each other.

  The upper reflective sheet 55 can be made of the same material as the lower reflective sheet 51. The upper reflection sheet 55 is affixed together with the lower reflection sheet 51 so as to sandwich a part of the light guide plate 20 and the linear light source device 30, thereby fixing the linear light source device 30 to the side surface S <b> 1 of the light guide plate 20.

  As shown in FIGS. 1 and 3, the linear light source device 30 has an axis line arranged along the longitudinal direction of the side surface of the light guide plate 20. A plurality of light emitting elements 320 as light sources are arrayed at a predetermined interval on an elongated rectangular bar-like wiring board 310. Reflecting portions 330 are arranged alternately with the light emitting elements 320. A light-transmitting resin sealing portion 340 made of a resin that seals the light emitting element 320 is formed in a recess formed between the reflecting portions 330. The resin sealing portion 340 may contain a phosphor that is excited by light from the light emitting element 320 and converts the wavelength of the light.

  On the surface opposite to the surface on which the light emitting element 320 of the wiring substrate 310 is mounted, that is, on the back surface of the wiring substrate 310, power supply terminals 311 for conducting connection with the connection terminal of the FPC 40 are provided at a plurality of locations. ing. Further, at both ends of the wiring substrate 310, a first cutout portion 312 in which a lower side surface as one side surface is cut out and a second cutout portion 313 in which an upper side surface as the other side surface is cut out are formed. .

  The first cutout 312 is cut out in a substantially L shape from the lower surface to the end surface of the wiring board 310. The second notch 313 is located inside the first notch 312 and is notched in a U-shaped cross section so as to form a recess.

  The interval between the first notches 312 is formed to match the interval between the first protrusions 212, and the interval between the second notches 313 is equal to the interval between the second protrusions 213. Is formed. The width of the second notch 313 is formed to match the width of the second convex portion 213.

  The FPC 40 is for electrically connecting the linear light source device 30 to an external power source (not shown), and is a widened portion that is a portion to which solder is applied to electrically connect the power source terminal 311 of the linear light source device 30. 410, an external connection part 420 exposing a wiring pattern for connection to an external power supply, and a wiring part 430 for connecting the widened part 410 and the external connection part 420.

  Next, a state where the linear light source device 30 is attached to the light guide plate 20 will be described with reference to FIGS.

  As shown in FIGS. 1 to 3, the wiring substrate 310 of the linear light source device 30 is positioned and fitted on the side surface S <b> 1 where the positioning portion 210 of the light guide plate 20 is provided. At this time, the first cutout portion 312 and the first convex portion 212 are inserted toward the side surface S1 so that the second cutout portion 313 and the second convex portion 213 are fitted.

  By fitting the linear light source device 30 into the light guide plate 20, the first convex portion 212 of the light guide plate 20 is wired by the first cutout portion 312 of the wiring substrate 310, and the second convex portion 213 is wired by the second cutout portion 313. The displacement of the substrate 310 with respect to the length direction (X direction) is restricted. Further, since the first convex portion 212 and the second convex portion 213 are provided in the space portion 211 of the light guide plate 20 so as to sandwich the wiring board 310, the displacement of the wiring board 310 with respect to the width direction (Z direction) is restricted. Is done.

  Further, the positioning part 210 constituted by the first convex part 212 and the second convex part 213 is provided so as to correspond to the first notch part 312 and the second notch part 313 provided at both ends of the wiring board 310. Therefore, the linear light source device 30 can be positioned on the side surface S <b> 1 of the light guide plate 20 without shifting one of both end portions of the linear light source device 30.

  Then, with the linear light source device 30 abutted against the light guide plate 20, the wiring substrate 310 is sandwiched between the upper reflection sheet 55 and the lower reflection sheet 51 together with the light guide plate 20, thereby fixing the distance from the light guide plate 20. Can be arranged in a state in which is kept uniform.

  Accordingly, the light from the linear light source device 30 can be uniformly incident on the side surface S1 without shifting from the center in the width direction of the side surface S1 of the light guide plate 20. Can be irradiated uniformly.

  In addition, since the first convex portion 212 and the second convex portion 213 are provided on the side surface S1 of the light guide plate 20 with the space portion 211 interposed, the thickness of the light guide plate 20 is small, and the wiring board of the linear light source device 30 Even if the thickness of 310 is thicker, the linear light source device 30 can be arranged in alignment with the center of the side surface S1 in the width direction.

  In the present embodiment, the first convex portion 212 and the second convex portion 213 of the light guide plate 20 are provided in the space portion 211, but the linear light source device 30 is closest to the side surface S1 of the light guide plate 20. If there is no problem even if it is arranged in the state in which it is left, it can be omitted. Even when the linear light source device 30 is closest to the side surface S1 of the light guide plate 20 or when the space portion 211 is provided, the light emitting element 320 of the linear light source device 30 is disposed on the main light emitting surface of the light guide plate 20. If high-luminance irregularities called eyeballs appear at the corresponding positions, the distance of the linear light source device 30 from the light guide plate 20 may be secured by adjusting the length of the space portion 211.

  As mentioned above, although embodiment of this invention has been described, this invention is not limited to the said embodiment. For example, by providing notches on the wiring substrate of the linear light source device on both end surfaces of the wiring substrate, it is not necessary to provide two convex portions on one end of the side surface of the light guide plate. It is possible to regulate the shift in the length direction and the width direction only with this. However, when the width of the wiring board is extremely narrow and it is difficult to provide it on both end faces of the wiring board, the notch is formed on only one side surface of the wiring board 310 as in the linear light source device 30 according to the present embodiment. It is desirable to provide a portion or a notch portion on the other side surface because the wiring board 310 can be easily processed.

  Since the present invention can be easily positioned and can irradiate the LCD with uniform illumination light, it is suitable for a light guide plate, a linear light source device, and a surface light emitting device that irradiate from the back side as a light source of illumination light such as an LCD. is there.

The perspective view of the surface emitting device which concerns on embodiment of this invention Side view of the linear light source device attached to the light guide plate The perspective view which looked at the linear light source device shown in FIG. 1 from the back side

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Surface light-emitting device 20 Light guide plate 30 Linear light source device 40 Flexible printed wiring board (FPC)
51 Lower reflection sheet 52 Diffusion sheet 53, 54 Prism sheet 55 Upper reflection sheet 210 Positioning part 211 Space part 212 First convex part 213 Second convex part 310 Wiring board 311 Power supply terminal 312 First notch part 313 Second notch part 320 Light emission Element 330 Reflecting portion 340 Resin sealing portion 410 Widened portion 420 External connection portion 430 Wiring portion S1 Side surface S2 Main light emitting surface

Claims (9)

In a light guide plate in which a linear light source device including a long wiring substrate and a plurality of light emitting elements arranged on the wiring substrate is disposed on one side as a light source,
A light guide plate, wherein a sandwiching portion projecting from the one side surface is provided so as to sandwich the width direction of the wiring board. 2. The light guide plate according to claim 1, wherein the sandwiching portion is provided so as to be fitted to a notch portion provided on both side surfaces along the length direction of the wiring board. The light guide plate according to claim 1, wherein the clamping portion is provided on the one side surface so as to sandwich both end portions of the wiring board. In a linear light source device comprising a long wiring board and a plurality of light emitting elements arranged on the wiring board, and arranged on one side of a light guide plate,
The linear light source device according to claim 1, wherein the wiring substrate is provided with a notch portion that fits into a sandwiching portion that protrudes from one side surface of the light guide plate so as to sandwich the wiring substrate. The linear light source device according to claim 4, wherein the notch is provided at both ends of the wiring board. A surface light emitting device including a linear light source device including a long wiring substrate and a plurality of light emitting elements arranged on the wiring substrate, and a light guide plate disposed on one side surface using the linear light source device as a light source. In
The surface light-emitting device, wherein the light guide plate is provided with a clamping portion protruding from the one side surface so as to sandwich the width direction of the wiring board. The linear light source device is provided with notches provided on both side surfaces along the length direction of the wiring board,
The surface light-emitting device according to claim 6, wherein the light guide plate is provided with the clamping portion so as to be fitted into the cutout portion. The surface light-emitting device according to claim 6 or 7, wherein the clamping portion is provided on the one side surface of the light guide plate so as to sandwich both end portions of the wiring board. The surface light-emitting device according to any one of claims 6 to 8, wherein the linear light source device is provided with the notches at both ends of the wiring board.

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