KR20020008079A - Surface light source device and image display device - Google Patents

Abstract

PURPOSE: To provide a surface light source device which may be easily disassembled and assembled and is capable of making high-quality surface illumination. CONSTITUTION: Tongue pieces 16 to 19 formed at light control members are 2 to 5 supported by a tongue piece supporting part 20 of a frame 6 and a tongue piece fastener 24 formed of an elastically deformable wire-shaped member is engaged with a tongue piece fastener engaging part 23 of the frame 6. The movement of the tongue pieces 16 to 19 is limited by this tongue piece fastener 24. The tongue piece fastener 24 may be easily mounted and removed at and from the tongue piece fastener engaging part 23 by elastically deforming the tongue piece fastener 24. Consequently, the disassembly and assembly of the surface light source device 1 are made easier.

Description

Surface light source device and image display device {SURFACE LIGHT SOURCE DEVICE AND IMAGE DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source device for illuminating an image display unit such as a liquid crystal display panel used in a portable PC, a car navigation device or a liquid crystal television, various monitors, etc. in a planar shape, and a display device having the same surface light source device. .

BACKGROUND ART A liquid crystal display device known as a typical image display device is used for image display of a portable PC or the like. In that case, the planar illumination light emitted from the surface light source device is supplied to the liquid crystal display panel (image display unit), and an image is displayed on the display screen of the liquid crystal display panel. FIG. 26 shows an example of the surface light source device 100 used here.

The surface light source device 100 includes a plastic frame 101, a reflective sheet 102, a light guide plate 103, and a plurality of light control members 104 to 107 that are stacked and accommodated therein. In the frame 101, a fluorescent lamp 110 is further accommodated as a primary light source near one side (incident surface) 108 of the light guide plate 103. The reflector 111 is attached to the fluorescent lamp 110 and is fixed with the screw 112.

The liquid crystal display panel (not shown) is arrange | positioned above the surface light source device 100, and is accommodated and fixed with the surface light source device 100 in the case of a portable PC, for example. It should be noted here that since the surface light source device 100 is conveyed to the surface light source unit alone until the liquid crystal display panel is installed, the light guide plate 103, the light control members 104 to 107, etc., are transported. This is because there is a risk of being separated from the frame 101 and dispersed due to vibration or shock during transportation.

If this happens, the light guide plate 103 or the light control members 104 to 107 may be damaged, or dust may enter between the light control members 104 to 107 or between the light guide plate 103 and the light control member 104. Cause problems such as.

Therefore, conventionally, as shown in FIG. 26, the peripheral part of the light control member 107 located in the uppermost part is attached to the frame 101 with the tape 113, and the light control members 104-107 or the light guide plate 103 are attached. The back was separated from the frame 101 so as not to be dispersed.

By the way, when the fluorescent lamp 110 is turned on, the light guide plate 103 or the light control members 104 to 107 are thermally expanded due to the heat. Therefore, when the fixing by the tape 113 is ensured, the top light control member 107 is secured. ) Is deformed or wrinkled as if floating from other light control member 106 occurred. Such deformations and wrinkles naturally make uniform high quality illumination difficult.

As a technique for solving the drawbacks of the conventional example, the surface light source device 100 shown in Fig. 27 or 28 has been developed (see Japanese Patent Laid-Open No. 11-281966). In the surface light source device 100 shown in FIG. 27, holes formed in the frame 101 and the long holes 117 formed in the positioner 114 having the pair of pins 115a and 115b and the light control member 116 are provided. 118 is used for fixing the light control member 116.

In other words, one of the pins 115b is engaged with the long hole 117 at some intervals, and both of the pins 115b and the pins 115a are formed in the frame 101. Are pressed into 118 and 118. As a result, the positioner 114 is fixed to the frame 101 while allowing the thermal expansion of the light control member 116. The flow amount of the light control member 116 is limited to the head 120 and the pin 115b of the positioner 114.

On the other hand, in the surface light source device 100 shown in FIG. 28, the long holes 117 of the light control member 116 engage with the pins 121 formed in the frame 101 at appropriate intervals. The tongue piece 123 of the light control member 116 is engaged with the tongue piece support part 122 formed in the frame 101.

The ground clip 124 having a cross-sectional U-shape has a form in which the slit 126 of the upper portion 125 engages with the pin 121 of the frame 101, and the ground clip engaging end portion of the frame 101 ( 127).

As a result, the surface light source device 100 allows thermal expansion of the light control member 116 while limiting the flow amount of the light control member 116 to the pin 121 and the ground clip 124 of the frame 101. .

However, in the conventional example shown in FIG. 27, since the pins 115a and 115b of the positioner 114 are press-fitted into the holes 118 and 118 of the frame 101, the positioner at the time of disassembling the surface light source device 100 is achieved. There is a drawback that 114 cannot be easily separated from the frame 101. In addition, during assembly, the press fitting process makes work inconvenient.

On the other hand, in the conventional example shown in Fig. 28, since the ground clip 124 is plate-shaped, when the ground clip 124 is engaged with the frame 101, the light control member 116 is moved around the ground clip 124. There is a risk of damage. Further, fine dust cut off from the light control member 116 adheres to the surface of the light control member 116 or enters between the light control member 116 and the light guide plate 103 (see FIG. 26), There was a risk of deteriorating the lighting quality.

Therefore, the present invention eliminates the drawbacks of the prior art, facilitates handling during assembly and disassembly, and easily absorbs thermal expansion during use, without causing problems such as damage of various members or intervening dust between the various members. An object of the present invention is to provide a surface light source device which can be used and an image display device having the device.

The present invention firstly includes a frame, a primary light source, a light guide plate, and a light control member accommodated in the frame, and the light of the primary light source is introduced into the light guide plate, and a planar shape from an exit surface of the light guide plate is obtained. It is applied to a surface light source device for outputting outgoing light through the light control member.

According to a feature of the present invention, tongues are formed in at least one peripheral portion of the light control member, and tongues supporting portions for supporting the tongues are formed in the frame.

The tongue clamping mechanism made of a linear elastic member for limiting the movement of the tongue tongue supported by the tongue clamping portion is detachably attached to the tongue clamping mechanism engaging portion formed in the frame.

Here, "limiting the movement of tongue tongue" allows movement of tongue tongue corresponding to the amount of expansion and contraction caused by temperature change or humidity change of light control member, but prevents movement of light control member from deviating from the frame. I say that.

In addition, it is preferable that through tongues are formed in the tongues, and engagement projections engaged with the through holes at intervals are formed in the tongue support portion. The cross-sectional shape of the tongue cutting mechanism may be, for example, approximately circular or approximately elliptical.

In addition, a support protrusion having a height equal to or slightly higher than the top surface of the tongue, which is supported by the tongue, is formed on both sides of the tongue, while the tongue assembly mechanism is formed of a rubber wheel, and the rubber wheel is fixed to the tongue. It may be engaged with the mechanism engaging portion and the support protrusion.

According to another feature of the invention, tongues are formed in at least one peripheral portion of the light control member, and tongue tongue support portions for supporting the tongues are formed in the frame. The tongue clamping mechanism made of an elastic member having portions positioned on both sides and the upper surface side of the tongue supported by the tongue supporting part is detachably attached to the tongue clamping mechanism engaging portion formed in the frame.

An image display apparatus having the characteristics according to the present invention is provided by arranging the surface light source device having the above various aspects so as to supply the planar output light from the exit surface of the light guide plate to the image display panel through the light control member. Is provided.

1 is an exploded perspective view of a surface light source device according to a first embodiment of the present invention.

FIG. 2: is a top view which shows the vicinity of the tongue knitting part of a surface light source device in detail, and corresponds to the figure seen from the C direction in FIG.

FIG. 3: is a side view which shows the vicinity of the tongue knitting part of a surface light source device in detail, and corresponds to the figure seen from the B direction in FIG.

4 is a plan view in the vicinity of the tongue tongue support part in a state where the tongue tongue fixing mechanism is removed, and corresponds to the view seen from the E direction in FIG. 5.

FIG. 5: is a side view of the tongue tongue support part vicinity in the state which removed the tongue clamping mechanism, and is corresponded to the figure seen from the D direction in FIG.

Fig. 6A is a front view showing the tongue knitting mechanism used in the first embodiment of the present invention, and Fig. 6B is a side view of the tongue knitting mechanism.

FIG. 7 is a plan view showing a process of engaging the tongue knitting mechanism with the tongue fitting mechanism, and corresponds to the view seen from the G direction in FIG. 8.

FIG. 8 is a side view illustrating a process of engaging the tongue cutting mechanism into the tongue fitting mechanism engaging portion, and corresponds to the view seen from the F direction in FIG. 7.

Fig. 9 is a plan view showing in detail the tongue tongue supporting portion vicinity of the surface light source device according to the second embodiment of the present invention.

FIG. 10: is a top view which shows the vicinity of the tongue tongue support part of the surface light source device concerning 3rd Embodiment of this invention in detail, and corresponds to the figure seen from the K direction in FIG.

FIG. 11: is a side view which shows the vicinity of the tongue tongue support part of the surface light source device concerning 3rd Embodiment of this invention in detail, and corresponds to the figure seen from the J direction in FIG.

FIG. 12: is a top view which shows the vicinity of the tongue tongue support part of the surface light source device which concerns on 4th Embodiment of this invention, Comprising: It corresponds to the figure seen from the M direction in FIG.

FIG. 13: is a side view which shows the vicinity of the tongue tongue support part of the surface light source device concerning 4th Embodiment of this invention in detail, and corresponds to the figure seen from the L direction in FIG.

Fig. 14A is a front view showing the tongue knitting mechanism used in the fourth embodiment of the present invention, and Fig. 14B is a side view of the tongue knitting mechanism.

FIG. 15: is a top view which shows the vicinity of the tongue tongue support part of the surface light source device which concerns on 5th Embodiment of this invention, Comprising: It corresponds to the figure seen from the O direction in FIG.

FIG. 16: is a side view which shows the vicinity of the tongue tongue support part of the surface light source device concerning 5th Embodiment of this invention in detail, and corresponds to the figure seen from the N direction in FIG.

Fig. 17 is a front view showing a tongue knitting mechanism used in the fifth embodiment of the present invention.

FIG. 18: is a top view which shows the vicinity of the tongue tongue support part of the surface light source device which concerns on 6th Embodiment of this invention, and corresponds to the figure seen from the Q direction in FIG.

FIG. 19: is a side view which shows the vicinity of the tongue tongue support part of the surface light source device concerning 6th Embodiment of this invention in detail, and corresponds to the figure seen from the P direction in FIG.

20 is a cross-sectional view taken along the line A-A in FIG. 2.

FIG. 21 is a cross-sectional view taken along the line H-H in FIG. 9.

(A), (b) has shown the example of the cross-sectional structure along the line II in FIG. 10 (3rd Embodiment) in all, (a) is sectional drawing which shows the 1st example, (b) is the It is sectional drawing which shows a 2nd example.

Fig. 23 is a cross-sectional view showing the tongue tongue support part in the vicinity of the surface light source device according to the seventh embodiment of the present invention.

24 (a) and 24 (b) are plan views each showing a modified example of the light control member used in another embodiment, (a) a first example thereof, (b) a second example thereof, (c) Shows a third example.

Fig. 25A is a front view of the tongue knitting mechanism, and Fig. 25B is a side view of the tongue knitting mechanism.

26 is an exploded perspective view of a conventional surface light source device.

27 is an exploded perspective view showing a part of the surface light source device according to the conventional example.

28 is an exploded perspective view showing a part of the surface light source device according to another conventional example.

* Explanation of Signs of Major Parts of Drawings *

1: surface light source device 2-5: light control member

6: frame 8: light guide plate

11: fluorescent lamp (primary light source) 14: image display panel

16-19: tongue tongue 20: tongue tongue support part

21a to 21d: long hole (through hole) 22: engagement protrusion

23: tongue section fixing mechanism 24, 48: tongue section fixing mechanism

36: exit surface 45: image display device

56: rubber wheel (Sleep fixing mechanism)

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

[First embodiment]

1 to 3, the surface light source device 1 according to the first embodiment is shown. 1 shows the schematic structure of the surface light source device 1 in an exploded perspective view. 2 is a plan view showing a part for mounting the light control members 2 to 5 used in the surface light source device 1 to the frame 6, and FIG. 3 is an arrow view seen from the direction B in FIG. . 2 is an arrow view seen from the C direction in FIG.

As shown in these figures, the surface light source device 1 has a frame 6 for accommodating or fixing various components. In the various parts, the reflective sheet 7, the light guide plate 8 and the plurality of light control members 2 to 5 and the one side surface (incident surface) of the light guide plate 8, which are stacked in order in the frame 6, are accommodated ( The fluorescent lamp (primary light source) 11 accommodated in the frame 6 so that 10 may follow, and the reflector 12 which guides the light of the fluorescent lamp 11 to the incident surface 10 are included.

(frame)

The frame 6 consists of injection molded objects of white synthetic resin, such as PC (polycarbonate) and PMMA (polymethyl methacrylate), and is substantially rectangular. In the frame 6, a first accommodating part for accommodating the reflective sheet 7, the light guide plate 8, and the light control members 2 to 5, and for mounting the reflector 12 accommodating the fluorescent lamp 11 ( 13) and a second accommodating portion 15 for accommodating the image display panel 14, such as a liquid crystal display panel, with respect to the surface of the uppermost light control member 5 at a slight interval.

The frame 6 is provided with tongue support portions 20 for supporting tongue tongues 16 to 19 formed in at least one peripheral portion of the light control members 2 to 5. The tongue support portion 20 is provided with a substantially columnar engagement protrusion 22 that engages the long holes (through holes) 21a to 21d of the tongue pieces 16 to 19. Moreover, the tongue 6 fixing mechanism engaging part 23 is formed in the frame 6 according to the formation position of the tongue support part 20. As shown in FIG.

The vicinity of the tongue tongue support 20 of the frame 6 is shown in FIGS. In addition, the tongue piece fixing mechanism 24 is shown in FIG. Here, FIG. 4 is a figure which shows the state which removed the tongue knitting mechanism 24 in FIG. 2, and FIG. 5 shows the state which removed the tongue knitting mechanism 24 in FIG. As shown in these figures, the tongue knitting portion 20 is formed so as to notch a part of the frame 6.

Then, the engagement projections 22 formed in the tongue knitting support 20 are engaged with the spacing between the design holes 21a to 21d of the tongue pieces 16 to 19. The engagement protrusion 22 is designed so that the height dimension thereof is larger than the sum of the thickness dimensions of the light control members 2 to 5, and the tongue knitting mechanism 24 is engaged with the tongue knitting mechanism fitting 23. The tongue pieces 16-19 are formed in the dimension which does not separate from the engagement protrusion part 22. As shown in FIG.

2 to 5, the tongue piece fixing mechanism engaging portion 23 includes a pair of longitudinal grooves 25a and 25b formed so as to be located on both sides of the tongue pieces 16 to 19, and these vertical grooves 25a. And a horizontal groove 26 formed to be orthogonal to the lower portion of the bottom portion 25b. Among these, the longitudinal grooves 25a and 25b of the tongue-locking mechanism engaging portion 23 are formed in left and right symmetrical shapes with the engagement protrusion 22 as the center, as shown in FIGS. 2 and 4. It has a substantially hook shape with recesses 27a and 27b for receiving the mechanism 24.

Here, the recesses 27a and 27b are formed on the outer wall surfaces 28a and 28b of the longitudinal grooves 25a and 25b. Then, the outer wall surfaces 28a, 28b of the vertical grooves 25a, 25b are formed obliquely so as to open toward the outside of the side surface of the frame 6, and to the recesses 27a, 27b of the vertical grooves 25a, 25b. The tongue tongue fastening mechanism 24 is made easy to engage.

Further, the corners of the lower peripheries 30a and 30b of the longitudinal grooves 25a and 25b to which the tongue knitting mechanism 24 abuts are cut off, so that the bending corner portions 31a and 31b of the tongue knitting mechanism 24 are vertical grooves 25a. , 25b) is designed so as not to interfere with the lower periphery 30a, 30b (see FIG. 6).

2 and 4, the notching depths from the side surfaces of the frame 6 of the longitudinal grooves 25a and 25b and the horizontal grooves 26 are formed to have substantially the same dimensions W, and the tongue knitting mechanism (24) is designed to securely engage with the tongue clamping mechanism engaging portion (23). The outer wall surfaces 28a and 28b of the longitudinal grooves 25a and 25b are not limited to the linear chamfering shown in Figs. 2 and 4, and may be R edge cutting.

(Sleep fixing mechanism)

As shown in detail in FIG. 6, the tongue piece fixing mechanism 24 is formed by bending a metal linear member having an elastic shape having a substantially circular cross section. The tongue knitting mechanism 24 has tongue tongue portions 32 for restricting the emergence of tongue tongues 16 to 19 from the tongue tongue support portion 20, and extending downwards at both ends of the tongue tongue portions 32, respectively. The vertical groove engaging portions 33a and 33b and the horizontal groove engaging portions 34a and 34b formed by bending the lower ends of the vertical groove engaging portions 33a and 33b to open outward are formed (Fig. 6 (a)). Reference).

And, as shown in Fig. 6 (b), the tongue tongue clamping mechanism 24 includes the tongue tongue pressing part 32, the longitudinal groove engaging portion 33b (33a) and the horizontal groove engaging portion 34b (34a). It is formed to be located on about the same plane.

The tongue clamping mechanism 24 formed in this way is engaged with the tongue clamping mechanism engaging part 23, for example, as shown to FIG. 7 and FIG. That is, the tongue piece fixing mechanism 24 first engages the longitudinal groove engaging portion 33a of one side (the left side in FIGS. 7 and 8) with the recess 27a of the one longitudinal groove 25a, and at the same time, one side. Engages the horizontal groove engaging portion 34a of the horizontal groove 26.

Next, the recessed portion of the other longitudinal groove 25b in the state where the tongue groove pressing portion 32 of the tongue knitting mechanism 24 or the longitudinal groove engaging portion 33b of the other side (right side in FIGS. 7 and 8) is elastically deformed. While engaging with 27b, the other horizontal groove engaging portion 34b is engaged with the horizontal groove 26. Thus, as shown in Figs. 2 and 3, the tongue piece fixing mechanism 34 is securely attached to the tongue piece fixing mechanism engaging portion 23 so as not to be separated from the frame 6.

In the case where the tongue piece fastening mechanism 24 is separated from the frame 6, the following procedure is taken, for example. First, the tongue knitting mechanism 24 is elastically deformed, and the other longitudinal groove engaging portion 33b of the tongue knitting mechanism 24 is separated from the recess 27b of the other longitudinal groove 25b. Then, one longitudinal groove engaging portion 33a of the tongue piece fixing mechanism 24 is separated from the recess 27a of the one longitudinal groove 25a. As a result, the engagement state between the horizontal groove engaging portions 34a and 34b and the horizontal groove 26 is also released, so that the tongue knitting mechanism 24 can be easily separated from the frame 6.

Here, as shown in FIG. 3 and FIG. 20, the tongue piece clamping part 24 is formed in the tongue piece clamping mechanism 24, and the horizontal groove engaging parts 34a and 34b are the upper wall surface 35 of the horizontal groove 26. As shown in FIG. ), The tongue pieces 16 to 19 can slide on the tongue support portion 20 smoothly.

That is, the tongue tongue fixing mechanism 24 is in contact with the tongue tongue fixing mechanism engaging portion 23 of the frame 6 shown in FIG. 3, and the tongue tongue pressing portion 32 is in contact with the tongue tongues 16 to 19, or It is formed in the dimension which a little space | interval arises between tongue tongues 16-19.

As a result, the tongue knitting mechanism 24 prevents inflation or contraction due to the temperature change or the humidity change of the light control members 2 to 5 while limiting the injury from the tongue tongue support 20 of the tongue pieces 16 to 19. Allow.

(Light control member)

In this embodiment, a light diffusion sheet (first light control member) 2 disposed to face the exit surface 36 of the light guide plate 8 and a pair of light diffusion sheets disposed on the upper surface side of the light diffusion sheet 2 are provided. Protective sheet (fourth light control member) having prism sheets (second and third light control members) 3, 4 and light diffusivity arranged on the upper surface side of these prism sheets 3, 4 (5) ) Constitutes a light control member.

These first to fourth light control members 2 to 5 are formed of a resin material excellent in light transmittance. Moreover, it is formed so that the length of the substantially rectangular shape corresponding to the emission surface 36 and parallel to the fluorescent lamp 11 may become larger than the length of the direction orthogonal to the fluorescent lamp 11.

Each of these light control members 2 to 5 has substantially rectangular tongues 16 to 19 on one of a pair of sides in a direction orthogonal to the fluorescent lamp 11. Long holes 21a to 21d are formed in the tongue pieces 16 to 19, respectively.

These long holes 21a to 21d are engaged at intervals at the engagement projections 22 of the tongue support portion 20. In addition, these dimensions are such that the gaps can absorb the difference between the amount of expansion or contraction caused by the temperature change or the humidity change of the first to fourth light control members 2 to 5 and the amount of expansion or contraction of the frame 6. It is designed to generate | occur | produce between this engagement protrusion part 22. As shown in FIG.

Moreover, the light control member 5 located in the uppermost part among the light control members 2-5 is the other side located on the opposite side to the one side in which the tongue piece 19 was formed, and the frame (the tape 37) was used. It is fixed to the tape fixing part 38 of 6).

The light control members 2 to 5 thus formed are placed on the tongue support portion 20 in a state in which the long holes 21a to 21d of the tongue pieces 16 to 19 are engaged with the engagement protrusion 22. Then, while the tongue knitting mechanism 24 is engaged with the tongue knitting mechanism engaging portion 23 of the frame 6, the light control member 5 is tape 37 to the tape fixing portion 38 of the frame 6. Is fixed to. As a result, the floating from the frame 6 together with the reflective sheet 7 and the light guide plate 8 is restricted, and the positional shift in the first accommodating portion 13 of the frame 6 is limited.

(Light guide plate)

The light guide plate 8 is formed of resin material excellent in light transmittance, such as PC, PMMA, and cycloolefin resin. The cross section along the direction orthogonal to the fluorescent lamp 11 has a wedge shape that becomes thinner as it moves away from the fluorescent lamp 11. The shape of the exit surface (upper surface) 36 is substantially rectangular.

Light supplied from the fluorescent lamp 11 is introduced into the light guide plate 8 through the incident surface 10 and propagates therein. As is known, the emission from the exit surface 36 gradually occurs in this propagation process. Incidentally, various means for facilitating the emission from the exit surface 36 are known in order to obtain a sufficient amount of output light, but these means can be appropriately employed.

(Reflective sheet)

The reflective sheet 7 is made of a resin material excellent in light reflectivity and has a rectangle corresponding to the surface (lower surface) on the side opposite to the exit surface 36. As is known, the reflective sheet 7 functions to reflect the light emitted from the lower surface of the light guide plate 8 to return to the inside of the light guide plate 8. The reflective sheet 7 is supported by the first receiving portion 13 of the frame 6 and the lower surface portion 42 of the reflector 12.

(Reflector)

By reflecting the fluorescent lamp 11 from the back side, the reflector 12 is bent in a thin plate shape, and the cross section is formed in a substantially U shape. The reflector 12 reflects the light of the fluorescent lamp 11 and guides it to the incident surface 10 side of the light guide plate 8. The rising wall surface portion 40 and the upper surface portion 41 of the reflector 12 are accommodated in the frame 6, and the lower surface portion 42 is a reflector fixing portion 44 of the frame 6 with a screw 43. It is fixed to the side of the fluorescent lamp 11 side of the reflection sheet 7, the light guide plate 8, and the light control members 2-5.

In the surface light source device 1 according to the present embodiment configured as described above, the tongue piece fixing mechanism 24 is formed of a linear elastic member, and the tongue piece fixing mechanism 24 is elastic to the tongue piece fixing mechanism engaging portion 23. It can be engaged and disengaged in the deformed state. Therefore, the tongue piece fixing mechanism 24 can be easily attached and detached, and the surface light source device 1 can be easily disassembled and assembled.

In addition, in the present embodiment, since the tongue knitting mechanism 24 is formed by bending a linear member having a substantially circular cross section, even when the tongue knitting mechanism 24 comes in contact with the light control members 2 to 5, the tongue knitting fixture is fixed. Damage due to the mechanism 24 is less likely to occur on the light control members 2 to 5. Therefore, the generation of fine dust due to the contact between the tongue cutting mechanism 24 and the light control members 2 to 5 is prevented. Moreover, the fall of the illumination quality resulting from adhesion of the fine dust to the light control members 2-5 and the light guide plate 8 is not caused.

If the conventional ground clip is used in place of the tongue clamping mechanism 24 in this embodiment, it is easy to scrape the light control members 2 to 5 at the end of the ground clip. The fine dust generated at that time is attached to the light control members 2 to 5 and the light guide plate 8, which may cause confusion in the light emitting state.

Moreover, in this embodiment, the movement of tongue tongues 16-19 of light control members 2-5 is restrict | limited to tongue tongue fastening mechanism 24, and is opposite to tongue tongue 19 of light control member 5 of uppermost. The sides are fixed to the frame 6 with a tape 37. Therefore, the position shift of the light control members 2 to 5 can be limited while absorbing the expansion and contraction caused by the temperature change or the humidity change of the light control members 2 to 5. Therefore, stress is generated in the light control members 2 to 5 so that the wrinkle-like deformation does not occur. For this reason, the fall of the illumination quality resulting from the stress or deformation which arises in the light control members 2-5 is prevented, and high-quality surface illumination is maintained.

In addition, in the case where an image display panel 14 such as a liquid crystal display panel is provided in the surface light source device 1 according to the present embodiment to form an image display apparatus 45 such as a liquid crystal display device, disassembly and assembly becomes easy, It is possible to maintain stable image display quality.

(Modified example of the aspect of light control member)

In the present embodiment, as described above, the first to fourth light control members 2 to 5 are used, and the light emitted from the exit surface 36 is diffused to the first light control member 2 to uniform the luminance. In addition, the advancing direction of light in the normal direction of the emission surface 36 is changed to the second and third light control members 3 and 4 to increase the ratio of light that can be effectively used for illumination. Here, the light control members 3 and 4 are so-called prism sheets, and each has a prism face provided with a plurality of prism cuts having a substantially triangular cross section. The extending direction of the prism cut group of each light control member 3, 4 is substantially orthogonal. That is, the prism cut group of the light control member 3 extends substantially in parallel with the incident surface 10, and the prism cut group of the light control member 4 extends substantially perpendicular to the incident surface 10.

The fourth light control member 5 is a protective sheet for preventing damage to the prism face, but a function as a diffusion sheet is provided as necessary to make the illumination light even more uniform.

However, such a form is not intended to limit the present invention, and various modifications are allowed. For example, the first light control member 2 may be omitted. In addition, the lower surface of the light guide plate 8 may be provided with the same prism surface as the prism surface of the second light control member 3, and the first light control member 2 and the second light control member 3 may be omitted. .

That is, this invention assumes the structure which arrange | positions at least one light control member on the emission surface 36 side of the light guide plate 8, and if this premise exists, it may apply. In other words, as a specific configuration of the light guide plate or the light control member, various conventional configurations applicable to the surface light source device may be appropriately selected and adopted.

Second Embodiment

9 and 21 show the vicinity of the tongue tongue support part 20 of the surface light source device 1 according to the second embodiment of the present invention. As shown in these figures, in the present embodiment, the end portion 47 is formed by notching the top portion 46 of the engagement projection portion 22, and an image display panel such as a liquid crystal display panel at the end portion 47 ( 14) to be engaged. When the present embodiment is compared with the first embodiment, in the present embodiment, the image display panel 14 is engaged with the end portion 47 of the engaging projection 22, whereas in the first embodiment, the image display panel ( The engagement protrusion 22 is located outside than the outer periphery of 14).

In other words, in the present embodiment, the tongue pieces 16 to 19 can be made smaller by the portion that engages the end portion 47 of the engagement projection 22 with the image display panel 14. In addition, the frame 6 can be made smaller and lighter in weight as long as the tongue pieces 16 to 19 can be made smaller. Therefore, according to this embodiment, the size and weight of the surface light source device 1 and the image display device 45 including the device 1 can be reduced.

In addition, in this embodiment, the engagement protrusion part 22 is formed so that it may become larger than the sum of the thickness dimension of the light control members 2-5, similarly to the case of 1st embodiment, and the engagement protrusion part 22 and the tongue clamping mechanism The tongue piece pressing part 32 of 24 is formed so that it may overlap in a height direction. Therefore, the engagement state of the long holes 21a-21d of the tongue surface 16-19 and the engagement protrusion part 22 is not canceled unless the tongue clamping mechanism 24 is isolate | separated from the frame 6. As shown in FIG.

In addition, due to the above-described dimensional conditions and overlapping conditions of the engaging projection 22, the tongue knitting mechanism 24 falls down, so that the tongue knitting part 32 of the tongue engaging mechanism 24 causes the government 46 of the engaging projection 22 to be reduced. And the problem of pinching between the image display panel 14 can also be prevented. Therefore, in this embodiment, the image display panel 14 can be accommodated in the 2nd accommodating part 15 of the frame 6 in the stable state.

[Third Embodiment]

10, 11, and 22 (a) show the details of the tongue knitting portion 20 adopted in the surface light source device 1 according to the third embodiment in detail. As shown in these figures, in the present embodiment, the thickness of the tongue piece fixing mechanism 24 is made thin and the height of the engagement protrusion 22 is reduced. Thus, as in the second embodiment, the engaging projection 22 and the image display panel 14 are overlapped without forming the end portion 47 in the top portion 46 of the engaging projection 22. 16-19) can be made small.

In addition, the frame 6 can be made smaller and lighter in weight as long as the tongue pieces 16 to 19 can be made smaller. Therefore, according to the present embodiment, the surface light source device 1 and the image display device 45 including the device 1 can be reduced in size and weight as in the second embodiment.

In addition, in this embodiment, although the aspect which narrows the thickness of the tongue piece fixing | fixing mechanism 24 was illustrated, the deformation | transformation shown in FIG. 22 (b) is also possible. That is, the cross-sectional shape of the tongue knitting mechanism 24 is made into an elliptical shape of a smooth curved surface without an angle, and the thickness of the tongue knitting mechanism 24 is made thin, thereby lowering the height of the engagement protrusion 22, and engaging protrusion 22 And the image display panel 14 may be superimposed.

Fourth Embodiment

12 to 14 show in detail the tongue knitting support 20 and the tongue knitting mechanism 48 employed in the surface light source device 1 according to the fourth embodiment of the present invention. In addition, in this embodiment, about the structure similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is attached | subjected and the description which overlaps with the said 1st Embodiment is abbreviate | omitted.

As shown in these figures, in the present embodiment, recesses 27a and 27b are formed on the inner wall surfaces 50a and 50b of the longitudinal grooves 25a and 25b. The inner wall surfaces 50a and 50b of the vertical grooves 25a and 25b are formed obliquely so as to open toward the outside of the side surface of the frame 6, and the recesses 27a and 27b of the vertical grooves 25a and 25b are formed. It is easy to engage the tongue tongue fastening mechanism 48 in this.

In addition, the lower ends of the vertical grooves 25a and 25b are opened in the horizontal grooves 26, and the edges of the lower peripheral edges 51 of the inner wall surfaces 50a and 50b of the vertical grooves 25a and 25b are cut off, and the tongue knitting mechanism is The bending corner 52 of the 48 and the lower periphery 51 of the vertical grooves 25a and 25b do not interfere.

The tongue piece fixing mechanism 48 is formed by bending a metal linear member having elasticity having a substantially circular cross section. Then, the tongue knitting mechanism 48 has a tongue tongue pressing portion 53 which restricts the tongue tongues 16 to 19 from rising from the tongue tongue supporting portion 20, and downwards from both ends of the tongue tongue pressing portion 53, respectively. It has extending longitudinal groove engaging portions 54a and 54b and horizontal groove engaging portions 55a and 55b formed by bending the lower ends of the longitudinal groove engaging portions 54a and 54b inwardly (Fig. 14 (a). ) Reference).

In addition, as shown in Fig. 14 (b), the tongue tongue clamping mechanism 53, the longitudinal groove engaging portions 54a and 54b and the lateral groove engaging portions 55a and 55b are substantially the same. It is formed to be located on the plane. In the tongue piece fixing mechanism 48 configured as described above, the longitudinal groove engaging portions 54a and 54b are formed in the vertical grooves 25a and 25b in a state in which the grooves are fastened so that the space between the horizontal groove engaging portions 55a and 55b is expanded. Engaged in the recesses 27a and 27b, and engaged with the lateral groove engaging portions 55a and 55b in contact with the upper wall surface 35 of the lateral groove 26.

As a result, the tongue knitting mechanism 48 is reliably engaged with the tongue knitting mechanism engaging portion 23 of the frame 6, thereby limiting the rise of the tongue pieces 16 to 19 from the tongue knitting support 20. As shown in FIG. By such a structure, the effect similar to the said 1st Embodiment can be exhibited.

[Fifth Embodiment]

15-16 show the detail of the tongue tongue support part 20 employ | adopted in the surface light source device 1 which concerns on 5th Embodiment in detail. 17 illustrates the tongue piece fixing mechanism 56 used in the present embodiment. In the present embodiment, the same components as those of the first and fourth embodiments are denoted by the same reference numerals as those of the first and fourth embodiments, and descriptions overlapping with the first and fourth embodiments are omitted.

In this embodiment, a pair of support protrusions 57 and 57 which are respectively located at both sides of tongue tongues 16 to 19 and protrude at the same height as the top surface of tongue tongue 19 or slightly above the top surface of tongue tongue 19 are provided. It is formed in the tongue knit support 20.

On the other hand, the linear rubber wheels as the tongue knitting mechanism 56 are engaged with the recesses 27a and 27b and the horizontal grooves 26 of the longitudinal grooves 25a and 25b. With this arrangement, even if the tongue clamping mechanism 56 is a rubber wheel, the positional relationship between the tongue clamping mechanism 56 and the tongues 16 to 19 is properly maintained by the pair of support protrusions 57 and 57.

In addition, since the tongue clamping mechanism 56 does not press the tongue tongues 16 to 19 against the tongue tongue support 20 with a strong force, expansion and contraction due to temperature change or humidity change of the light control members 2 to 5 is caused. Can absorb. Therefore, also in this embodiment, the same effect as the said 1st embodiment can be acquired.

In addition, in this embodiment, since the tongue piece fixing mechanism 56 is a rubber wheel, even if it contacts the tongue piece 16-19, it does not lead to a damage accident. Therefore, in this embodiment, the cross-sectional shape of the tongue clamping mechanism 56 may not be substantially circular. For example, the cross-sectional shape of the tongue piece fixing mechanism 56 may be square.

[Sixth Embodiment]

18 and 19 show the vicinity of the tongue-supporting part 20 adopted in the surface light source device 1 which concerns on 6th Embodiment of this invention. In the present embodiment, the same components as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description overlapping with the first embodiment is omitted.

In the present embodiment, the engagement projections 22 are not formed in the tongue tongue support 20, and the long holes 21a to 21d are not formed in the tongue tongues 16 to 19, respectively. That is, the movement of the tongue tongues 16 to 19 is restricted by the tongue tongue pressing part 32 and the pair of longitudinal groove engaging portions 33a and 33b of the tongue knitting mechanism 24. Also with such a structure of this embodiment, the effect similar to the said 1st Embodiment can be acquired.

Seventh Embodiment

FIG. 23: is sectional drawing which shows the vicinity of the tongue tongue support part 20 of the surface light source device 1 which concerns on 7th Embodiment of this invention, and is a figure corresponding to FIGS. In addition, in FIG. 23, about the structure similar to the structure shown in FIG. 20, the code | symbol same as FIG. 20 is attached | subjected and the description which overlaps with the description of FIG. 20 is abbreviate | omitted.

In this embodiment, as shown in FIG. 23, the tongue pieces 16-18 are not formed in the 1st-3rd light control members 2-4 (refer FIG. 1). And tongue tongue 19 is formed only in 4th light control member 5, the fundamental part of this tongue piece 19 is bent by the dimension corresponding to the thickness of 1st-3rd light control member 2-4. The engagement projections 22 are engaged with the long holes 21d formed in the tongue pieces 19.

In the present embodiment, it is preferable to leave a fold mark at the bent portion of the tongue piece 19. This prevents a phenomenon such as the occurrence of the vicinity of the tongue 19 of the fourth light control member 5 by bending the root portion of the tongue 19 so as to reduce the quality of the light emitting surface of the surface light source device 1. It is more advantageous to avoid.

The surface light source device 1 of such a structure exhibits the same effect as the said 1st Embodiment. Furthermore, in the present embodiment, the tongue pieces 19 are formed only in the fourth light control member 5, and the tongue pieces 16-18 are not required to be formed in the other 1-3 light control members 2-4. It is also possible to use the conventional light control member as it is for the first to third light control members 2 to 4 as it is.

Therefore, compared with each said embodiment, cost reduction of the surface light source device 1 can be aimed at. In addition, in this embodiment, since there is only one tongue piece 19, as shown, the height dimension of the engagement protrusion 22 can be made low, and even if the image display panel 14 and the engagement protrusion 22 overlap, The image display panel 14 and the engagement protrusion 22 do not interfere with each other. Therefore, the frame 6 can be reduced in size and weight, and the weight and size of the entire surface light source device 1 can be easily reduced.

[Eighth Embodiment]

In the present embodiment, the tongue knitting mechanism 58 is used instead of the tongue knitting mechanism 48 adopted in the fourth embodiment and the tongue knitting mechanism 56 adopted in the fifth embodiment. That is, the tongue piece fixing mechanism 58 employ | adopted in this embodiment has comprised ring shape, as shown to FIG. 25 (a). The tongue knitting mechanism 58 is formed such that the tongue pressing part 60 and the horizontal groove engaging portion 61 are substantially parallel to each other, and the pair of longitudinal groove engaging portions 62a and 62b are curved inward.

The tongue piece fixing mechanism 58 is made of a metal or resin having a substantially circular cross section, and is formed so that the whole is located on the same plane as shown in Fig. 25 (b). In the present embodiment employing the tongue clamping mechanism 58 configured as described above, since the longitudinal groove engaging portions 62a and 62b are elastically deformed, the tongue clamping mechanism engaging portion 23 shown in Figs. 12 and 15 is easily and reliably. Can be mounted or removed.

[Other Embodiments]

Each embodiment described above is not intended to limit the present invention, and the following modifications are allowed, for example.

(1) In each said embodiment, the tongue pieces 16-19 are formed in one peripheral part of the 1st-4th light control members 2-5. However, this does not limit the present invention. For example, a plurality of tongue pieces 19 may be formed in the fourth light control member 5 as shown in Figs. 24A to 24D.

In the example of FIG. 24 (a), the some tongue pieces 19 and 19 are formed in the opposite side with respect to the edge | side fixed by the tape 37. In FIG. In addition, in the example shown to FIG. 24 (b), the tongue piece 19 is formed instead of the tape 37 of FIG. 24 (a), and a triangle is formed in each tongue piece 19, 19, 19. As shown in FIG. Thereby, the light control member 5 can be kept in a stable state by the frame.

In addition, in the example of FIG. 24 (c), two tongue pieces 19 are formed instead of the tape 37 of FIG. 24 (a), and the light control member 5 is stably held in a frame. In addition, in the example of FIG. 24D, the tongue piece 19 is formed instead of the tape 37 of FIG.

In addition, you may change suitably the formation position and number of the tongue piece 19 by the magnitude | size of the light guide plate 8 exit surface 36, other design conditions, etc.

(2) In each of the embodiments described above, the tongue piece fixing mechanism is formed of a linear elastic member. However, as long as it can exert the same function as the tongue clamping mechanism of the above embodiment, the tongue clamping mechanism may be formed of a thin plate-like elastic member made of plastic or metal.

(1) The present invention supports the tongues formed in the light control member by the tongue tongue support of the frame, and engages the tongue tongue fixing mechanism formed of the linearly deformable linear member with the tongue tongue fitting mechanism engaging portion of the frame. The fasteners restrict the movement of the tongue. The tongue clamping mechanism can be easily mounted and detached by engaging the tongue clamping mechanism by elastic deformation of the tongue clamping mechanism, so that the surface light source device can be easily disassembled and assembled.

(2) This invention also includes the aspect which makes the cross-sectional shape of the tongue clamping mechanism formed of the linear member into substantially circular shape. According to this aspect, even when the tongue knitting mechanism contacts the light control member, damage to the light control member caused by the tongue knitting mechanism does not occur. Accordingly, the phenomenon of generating fine dust due to the contact between the tongue-fixing mechanism and the light control member is suppressed. As a result, fine dust adheres to the light control member or the light guide plate, thereby eliminating confusion in the light emission distribution. As a result, the quality of the surface light can be made stable.

(3) According to the present invention, since the tongue clamping mechanism can absorb the expansion and contraction caused by the temperature change or the humidity change of the light control member while limiting the movement of the tongue, wrinkle deformation or excessive stress in the light control member. It does not cause it. Accordingly, the deterioration of the illumination quality due to such deformation or excessive stress does not occur.

(4) The present invention includes an aspect in which the tongue knitting mechanism is formed of a linear member that is softer than the light control member. In this embodiment, even if the tongue clamping mechanism contacts the light control member, damage caused by the tongue clamping mechanism is unlikely to occur in the light control member. Therefore, the tongue piece fixing mechanism does not scrape the light control member to generate fine dust.

(5) The above advantages of the surface light source device according to the present invention are naturally reflected in the image display device according to the present invention. That is, disassembly and assembly become easy, and high quality and stable image display is attained.

Claims (12)

A frame, and a primary light source, a light guide plate, and a light control member accommodated in the frame, the light of the primary light source is introduced into the light guide plate, and the planar output light from the exit surface of the light guide plate is controlled by the light. A surface light source device output through a member, The tongue is formed in at least one peripheral portion of the light control member, The frame is provided with tongue tongue support for supporting the tongue tongue, The surface light source device, characterized in that the tongue tongue fixing mechanism made of a linear elastic member for limiting the movement of the tongue tongue supported by the tongue tongue support portion detachable in the state of elastic deformation of the tongue fitting mechanism engaging portion formed in the frame. . The method of claim 1, A through-hole is formed in the tongue, and an engagement protrusion for engaging with the through-hole at intervals is formed in the tongue support. The method according to claim 1 or 2, And a cross-sectional shape of the tongue clamping mechanism is substantially circular. The method according to claim 1 or 2, And a cross-sectional shape of the tongue-locking mechanism is substantially elliptical. The method according to claim 1 or 2, Support protrusions having a height equal to or slightly higher than the top surface of the tongue supported by the tongue support are formed on both sides of the tongue, The tongue piece fixing mechanism is formed of a rubber wheel, And the rubber wheel is engaged with the tongue fixing device engaging portion and the support protrusion. A frame, and a primary light source, a light guide plate, and a light control member accommodated in the frame, the light of the primary light source is introduced into the light guide plate, and the planar output light from the exit surface of the light guide plate is controlled by the light. A surface light source device output through a member, The tongue is formed in at least one peripheral portion of the light control member, The frame is provided with tongue tongue support for supporting the tongue tongue, The tongue clamping mechanism made of an elastic member having portions positioned on both sides and an upper surface side of the tongue supported by the tongue supporting part, is detachable in a state in which elastically deformed part of the tongue clamping mechanism engaging portion formed in the frame. The surface light source device. An image display apparatus comprising a surface light source device and an image display panel, The surface light source device includes a frame, a primary light source, a light guide plate, and a light control member accommodated in the frame, and introduces light from the primary light source into the light guide plate, and forms a surface from an exit surface of the light guide plate. Arranged to supply output light to the image display panel through the light control member; The tongue is formed in at least one peripheral portion of the light control member, The frame is provided with tongue tongue support for supporting the tongue tongue, The tongue display mechanism comprising a linear elastic member for limiting the movement of the tongue supported by the tongue support portion is detachable in a state in which elastically deformed portion of the tongue fixing mechanism engaging portion formed in the frame. . The method of claim 7, wherein A through-hole is formed in the tongue, and an engagement protrusion for engaging with the through-hole at intervals is formed in the tongue support. The method according to claim 7 or 8, And the cross-sectional shape of said tongue piece fixing mechanism is substantially circular. The method according to claim 7 or 8, And the cross-sectional shape of said tongue-locking mechanism is substantially elliptical. The method according to claim 7 or 8, Support protrusions having a height equal to or slightly higher than the top surface of the tongue supported by the tongue support are formed on both sides of the tongue, The tongue piece fixing mechanism is formed of a rubber wheel, And the rubber wheel is engaged with the tongue clamping mechanism engaging portion and the support protrusion. An image display apparatus comprising a surface light source device and an image display panel, The surface light source device includes a frame, a primary light source, a light guide plate, and a light control member accommodated in the frame, and introduces light from the primary light source into the light guide plate, and forms a surface from an exit surface of the light guide plate. Arranged to supply output light to the image display panel through the light control member; The tongue is formed in at least one peripheral portion of the light control member, The frame is provided with tongue tongue support for supporting the tongue tongue, A tongue clamping mechanism made of an elastic member having portions positioned on both sides and an upper surface side of the tongue, supported by the tongue supporting member, is detachably attached to the tongue clamping mechanism engaging portion formed in the frame in a state of being elastically deformed. The image display apparatus.