JP2012146504A - Lighting system and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device which prevents distortion and warping of a light guide plate even when the light guide plate is deformed unexpectedly, and prevents destruction of a light source, deterioration of light incident efficiency, and occurrence of luminance unevenness or the like.SOLUTION: A lighting system includes a light guide plate 5, a light guide plate support part 19 which is provided at the side of the light guide plate 5 and is in contact with the light guide plate 5, a frame member 7 having a light source 9 for emitting light toward the light guide plate 5, and an elastic body 11 to energize the frame member 7 so that the frame member 7 presses the light guide plate 5. The lighting system is so structured that the light guide plate 5 is supported by the energizing force of the elastic body 11 and deformation of the light guide plate 5 is absorbed by elastic deformation of the elastic body 11.

Description

  The present invention relates to an illuminating device and an image display device, and more particularly to an apparatus that supports a light guide plate of an illuminating device using an elastic body or the like.

  In recent years, an image display device that displays an image using a display module such as a liquid crystal panel (for example, a display device or a television device) has rapidly spread.

  When a liquid crystal panel is used for the display module, a backlight is required. For example, a linear light source such as a cold cathode ray tube (CCFL) or an external electrode fluorescent tube (EEFL) is used as a light source of the backlight, and an LED light source using an LED (light emitting diode) is used. There is.

  When using an LED light source, a light diffusion plate is provided on the back side of the liquid crystal panel, a direct type that installs the LED light source on the back side, and a light guide plate is provided on the back side of the liquid crystal panel, and the LED light source is arranged on the outer periphery. However, the latter structure is generally adopted to aim for thinness.

  In the edge light type structure, the light incident surface of the light guide plate (light incident surface; light guide plate) due to expansion and contraction of the light guide plate due to heat generated by the LED light source and humidity from the environment, that is, due to changes in temperature and humidity. The distance between the LED light source and the LED light source changes.

  When the light guide plate is formed of a transparent acrylic plate, the light guide plate absorbs moisture and the length of the light guide plate increases. For example, the absorption of 2% of water increases the lateral dimension of the light guide plate by about 3 mm with respect to 800 mm, thereby changing the distance between the light incident surface of the light guide plate and the LED light source.

  The variation in the distance causes the destruction of the light source due to the collision between the light source and the light guide plate, or the variation in the distance causes the degree of the light emitted from the LED light source to enter the light guide plate, thereby varying the light incident efficiency. (For example, the light incident efficiency may be reduced) and luminance unevenness may occur in the light guide plate.

  For example, the average luminance of the light exit surface on the light guide plate when the distance between the light incident surface of the light guide plate and the LED light source is 0 mm is set to 100%. On the other hand, when the distance between the light incident surface of the light guide plate and the LED light source is 3 mm, the average luminance is about 70%.

  In order to prevent the destruction of these light sources, the decrease in light incidence efficiency, the occurrence of uneven brightness, etc., a light source fixed to a light guide plate is known (for example, see Patent Document 1).

  In FIG. 4, FIG. 6, FIG. 13, FIG. 14, and FIG. 19 of Patent Document 1, round or oval holes are formed in each of the four corners of the light guide plate. The light source is fixed to the light guide plate using a fixing member fixed to the heat sink disposed on the back surface of the mounting substrate of the light source, and a pin fixed to the fixing member and entering the hole.

JP 2009-32664 A

  By the way, when the light guide plate 302 becomes large, local heat such as heat generation of the light source (part 304) and heat generation of the signal board (part 306) is generated in a part of the light guide plate 302 as shown in FIG. In addition, a situation occurs in which a part of the light guide plate 302 expands. Further, the temperature of the light guide plate 302 (the amount of heat applied to the light guide plate 302 or the amount of heat removed from the light guide plate 302), such as where it is exposed to sunlight and where it is not, or near the air outlet of the air conditioner, is the location ( The light guide plate 302 expands and contracts unevenly, and the design-targeted dimensions differ from place to place. Then, for example, the light guide plate 302 is deformed into a non-uniform shape as indicated by a broken line in FIG.

  The structure shown in Patent Document 1 is premised on a uniformly deformed light guide plate. For a non-uniformly deformed light guide plate, if the sliding mechanism does not function with respect to elongation or the light guide plate is damaged by stress. Problems such as sticking, distortion, and broken pins occur.

  Furthermore, for example, when the squareness of the light guide plate (the angle of the corner of the rectangular flat light guide plate) changes or when the linearity of the light incident surface changes, the destruction of the light source and the light incident efficiency Decrease and uneven brightness will also occur.

  The present invention has been made in view of the above problems, and even when the light guide plate is unexpectedly deformed, the light guide plate is prevented from being distorted or warped, the light source is destroyed, and the light incident efficiency is reduced. Another object of the present invention is to provide an image display device and a lighting device that prevent the occurrence of uneven brightness.

  1st invention is a light guide plate (5), the light guide plate support part (19) which is provided by the side of the said light guide plate (5), and contact | abutted to the said light guide plate (5), and the said light guide plate (5) The frame member (7) having a light source (9) that emits light toward the light source) and the frame member (7) bias the frame member (7) so that the frame member (7) presses the light guide plate (5). An elastic body (11) that supports the light guide plate (5) by the urging force of the elastic body (11), and deforms the light guide plate (5) of the elastic body (11). It is an illuminating device (1) comprised so that it may absorb by elastic deformation.

  According to a second aspect of the present invention, there is provided a light guide plate (5), a light guide plate support portion (19) provided on one side of the light guide plate (5) and in contact with the light guide plate (5), and the light guide plate. A first frame member (7A) having a light source (9) that emits light toward (5) and the other side of the light guide plate (5), which contacts the light guide plate (5). A second frame member (7B) including a light guide plate support portion (19) that is in contact with the light source plate (9) that emits light toward the light guide plate (5); and the first frame member ( The first elastic body (11A) for urging the first frame member (7A) and the second frame member (7B) so that the light guide plate (5) presses the light guide plate (5A). The second frame member (7B) is biased so as to press the light plate (5) in the direction opposite to the first frame member (7A). A second elastic member (11B) lighting device having a (1).

  According to a third aspect of the present invention, there is provided a housing (3) formed in a rectangular bowl shape, a light guide plate (5) formed in a rectangular flat plate shape and provided inside the housing (3), and the light guide. The light guide plate (5) includes at least two light guide plate support portions (19) in contact with each other, and is provided in the housing (3) on one side in the lateral direction of the light guide plate (5). A frame member (7A) and at least two light guide plate support portions (19) in contact with the light guide plate (5) are provided, and the casing (3) is provided on the other side in the horizontal direction of the light guide plate (5). ) Provided with a second frame member (7B) and at least two light guide plate support portions (19) in contact with the light guide plate (5), and in the longitudinal direction of the light guide plate (5) One side is in contact with the third frame member (7C) provided in the housing (3) and the light guide plate (5) A fourth frame member (7D) provided in the housing (3) on the other longitudinal side of the light guide plate (5), and at least two light guide plate support portions (19). A light source (9) that is provided on at least one of the frame members (7) and emits light toward the light guide plate (5), and one end of the light source plate (5) is attached to the housing (3). The first end is engaged so that the other end engages with the first frame member (7A) and the first frame member (7A) presses the light guide plate (5). The first elastic body (11A) for urging the frame member (7A), one end engages with the housing (3), and the other end engages with the second frame member (7B). The second frame member (7B) engages and the second frame member (7B) presses the light guide plate (5). The second elastic body (11B) for urging the elastic member (7B), one end engages with the casing (3), and the other end engages with the third frame member (7C). A third elastic body (11C) that engages and biases the third frame member (7C) so that the third frame member (7C) presses the light guide plate (5); One end is engaged with the housing (3), the other end is engaged with the fourth frame member (7D), and the fourth frame member (7D) is connected with the light guide plate (7D). 5) and the fourth elastic body (11D) for urging the fourth frame member (7D) so as to press, and the casing separated from the first frame member (7A) by a predetermined distance. A first stopper (13A) provided in (3), with which the first frame member (7A) abuts, and the second frame member ( 7B) from a second stopper (13B) provided on the housing (3) at a predetermined distance from which the second frame member (7B) abuts, and the third frame member (7C). A predetermined distance from the third frame member (7D) and a third stopper (13C) provided on the housing (3) at a predetermined distance and abutting against the third frame member (7C). It is an illuminating device (1) having a fourth stopper (13D) which is provided in the housing (3) at a distance and is in contact with the fourth frame member (7D).

  According to a fourth aspect of the present invention, there is provided a housing (33) formed in a rectangular bowl shape, a light guide plate (35) formed in a rectangular flat plate shape and provided inside the housing (33), and four The elongated frame member main body (43) and the four frame member coupling bodies (45) are combined to form a "B" shape, and each of the four frame member coupling bodies (45) is the 4 of the light guide plate. A frame member (31) provided in the casing (33) so as to abut each of the two corners and surround the light guide plate (35), and one end portion of the casing (33) The other end engages with at least one of the frame member main body (43) and the frame member coupling body (45), and each of the frame member coupling bodies (45) 35) to urge the frame member (31). When the elastic body (37), the light guide plate (35), and the frame member (31) are located at a predetermined first position with respect to the housing (33), the light guide plate (33) ) And the frame member (31) slightly move in the in-plane direction of the light guide plate (35) with respect to the housing (33) and have an axis parallel to the thickness direction of the light guide plate (35). A support portion (38) that supports the frame member (31) and a predetermined distance away from the frame member (31) so as to rotate about the center, and is provided in the housing (33), and the guide When the optical plate (35) and the frame member (31) are located at a predetermined second position with respect to the casing (33), a stopper (39) with which the frame member (31) abuts is provided. It is the illuminating device (1a) which has.

  5th invention is provided in the front side of the illuminating device (1, 1a) in any one of 1st-4th invention, and the said illuminating device (1, 1a), The said illuminating device ( 1, 1a) is an image display device having an image display panel using it as a backlight.

  According to the present invention, even when the light guide plate is unexpectedly deformed, the light guide plate can be prevented from being distorted or warped, and the destruction of the light source, the decrease in light incident efficiency, the occurrence of uneven brightness, and the like can be prevented. There is an effect that can be done.

It is a front view of the illuminating device (illuminating device in the inclination state) which concerns on 1st Embodiment. It is an II-II cross-sectional arrow view in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 1. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1. It is a figure which shows the state which the light-guide plate of the illuminating device which concerns on 1st Embodiment deform | transformed. It is a front view of the illuminating device (illuminating device in a horizontal state) which concerns on 2nd Embodiment. It is a front view of the illuminating device (illuminating device in the inclination state) which concerns on 2nd Embodiment. It is an enlarged view of the VIII part in FIG. It is the IX-IX cross section arrow view in FIG. FIG. 9 is a sectional view taken along the line XX in FIG. 8. It is a perspective view of the frame member coupling body seen from the front side. It is a perspective view of the frame member coupling body seen from the back side (back side). It is a perspective view of a frame member main body. It is a figure which shows the state which the light-guide plate of the illuminating device which concerns on 2nd Embodiment deform | transformed. It is a front view of the illuminating device which concerns on a modification. It is a front view of the illuminating device which concerns on another modification. It is a figure which shows the light-guide plate of the conventional illuminating device.

[First Embodiment]
The illumination device 1 shown in FIG. 1 and the like is used for an image display device (not shown) such as a display device of a personal computer or a television device, for example. In the image display device, a display panel (for example, a liquid crystal (LCD) panel) (not shown) is provided on the front side of the lighting device 1, and the lighting device 1 is used as a backlight device.

  Hereinafter, for convenience of explanation, one direction in the lighting device 1 (image display device) is defined as a horizontal direction, another direction orthogonal to the horizontal direction is defined as a vertical direction, and the horizontal direction and the vertical direction are orthogonal to each other. The direction is the front-rear direction. The said display panel is provided in the front side of the illuminating device 1 in the front-back direction.

  As shown in FIGS. 1, 2, and 3, the illuminating device 1 includes a housing (rear frame; rear shield) 3, a light guide plate 5, and a frame member 7 (first frame member 7A, second frame member 7B). , Third frame member 7C, fourth frame member 7D), light source 9, and elastic body 11 (first elastic body 11A, second elastic body 11B, third elastic body 11C, fourth elastic body 11D). ) And a stopper 13 (a first stopper 13A, a second stopper 13B, a third stopper 13C, and a fourth stopper 13D).

  The housing 3 is made of, for example, a metal having a high thermal conductivity such as steel, aluminum or aluminum alloy. Further, as shown in FIGS. 1, 2, and 3, the housing 3 has a rectangular plate-like bottom plate 15 and a predetermined height from the periphery of the bottom plate 15 on one surface in the thickness direction of the bottom plate 15. It is formed in a rectangular bowl shape (single-sided open box shape) with a side plate 17 that stands only vertically. When viewed from the thickness direction of the bottom plate 15, the side plate 17 has a “R” shape, and the bottom plate 15 exists inside the “B” shape.

  The light guide plate 5 is made of, for example, a transparent resin material such as a transparent acrylic plate. Further, the light guide plate 5 is formed in a rectangular flat plate shape, the thickness direction coincides with the thickness direction of the bottom plate 15 of the housing 3, the longitudinal direction coincides with the longitudinal direction of the housing 3, and the lateral direction Is provided in the inside of the housing at the center of the housing 3 so as to coincide with the horizontal direction of the housing 3.

  The thickness value of the light guide plate 5 is smaller than the height value of the side plate 17 of the housing 3. The vertical dimension of the light guide plate 5 is smaller than the vertical dimension of the bottom plate 15 of the housing 3. The horizontal dimension of the light guide plate 5 is also smaller than the horizontal dimension of the bottom plate 15 of the housing 3.

  Since the light guide plate 5 is provided in the central portion of the housing 3, in the lateral direction of the housing 3, the side plate (lateral one end side plate) 17 </ b> A located at one end in the lateral direction of the housing 3 and the light guide plate. 5A, a side plate (lateral side other side plate) 17B and a light guide plate located at the other lateral end of the housing 3 are separated from each other by a predetermined distance. The other end 5 in the horizontal direction (the other end in the horizontal direction of the light guide plate) 5B is separated by a predetermined distance.

  Similarly, in the longitudinal direction of the housing 3, a side plate (vertical one end side plate) 17 </ b> C positioned at one end in the longitudinal direction of the housing 3 and a longitudinal end of the light guide plate 5 (one end in the longitudinal direction of the light guide plate). ) 5C are separated from each other by a predetermined distance, and the side plate (vertical other side plate) 17D located at the other longitudinal end of the housing 3 and the other longitudinal end of the light guide plate 5 (light guide plate longitudinal direction). The other end 5D is separated by a predetermined distance.

  For example, the vertical dimension of the casing 3 and the light guide plate 5 is smaller than the horizontal dimension of the casing 3 and the light guide plate 5.

  The frame member 7 is made of metal such as aluminum or aluminum alloy having high thermal conductivity, resin (high-functional resin), or the like. When it is made of aluminum alloy or the like, the frame member 7 is formed by aluminum die casting, and when it is made of resin, the frame member 7 is formed by injection molding.

  The first frame member 7A includes at least two light guide plate support portions 19 (19A, 19B) in contact with the light guide plate 5, and one side of the light guide plate 5 in the horizontal direction (left side in FIG. 1). In the housing 3.

  Similarly to the first frame member 7A, the second frame member 7B, the third frame member 7C, and the fourth frame member 7D also have at least two light guide plate support portions 19 (contacting the light guide plate 5). 19A, 19B), the other side of the light guide plate 5 in the horizontal direction (right side in FIG. 1), one side of the light guide plate 5 in the vertical direction (lower side in FIG. 1), and the horizontal direction of the light guide plate 5 On the other side (upper side in FIG. 1).

  In addition, each light-guide plate support part 19A, 19B of each frame member 7 is mutually separated. That is, the first frame member 7A is formed in a bowl shape (a shape obtained by removing one long side from four sides of a rectangle). More specifically, in the first frame member 7A, an elongated rectangular parallelepiped portion having a predetermined width, thickness, and length is deleted from an elongated rectangular parallelepiped material having a predetermined width, thickness, and length. It is formed into a shape. The thickness of the material is the same as the thickness of the deleted part. The width of the deleted part is smaller than the width of the material, and the length of the deleted part is slightly smaller than the length of the material. In the width direction of the material and the deleted part, the deleted part is located on one end side of the material, and in the length direction of the material and the deleted part, the deleted part is located in the center of the material. In the thickness direction, the deleted part is located at the same position as the material. In addition, another two rectangular parallelepipeds may be integrally attached to the rectangular parallelepiped, and the frame member 7 may be shaped like a bowl.

  And a pair of convex parts (part which does not correspond to a deletion part) which remain in the both ends of the length direction of material constitute light guide plate support parts 19A and 19B, and the middle part of the length direction of material is The frame member main body 21 is configured. The length of the first frame member 7 </ b> A is slightly shorter than the vertical dimension of the light guide plate 5.

  The second frame member 7B is formed in the same shape as the first frame member 7A, and the third frame member 7C is formed in the same shape as the first frame member 7A except for the length. . The length of the third frame member 7 </ b> C is longer than the first frame member 7 </ b> A and slightly shorter than the lateral dimension of the light guide plate 5. The fourth frame member 7D is formed in the same shape as the third frame member 7C.

  The first frame member 7A is provided on the light guide plate 5 side between the lateral one end side plate 17A and the light guide plate lateral end 5A.

  More specifically, the thickness direction of the first frame member 7A (material) matches the thickness direction of the light guide plate 5, the length direction of the first frame member 7A matches the light guide plate 5 and the vertical direction, The first frame member 7A is provided inside the housing 3 such that the width direction of the first frame member 7A coincides with the light guide plate 5 and the lateral direction. In the longitudinal direction of the first frame member 7A and the longitudinal direction of the light guide plate 5, the center position of the first frame member 7A and the center position of the light guide plate 5 substantially coincide with each other. Further, the two light guide plate support portions 19 </ b> A and 19 </ b> B of the first frame member 7 </ b> A are in contact with the light guide plate 5. Thus, the lateral one end side plate 17A and the first frame member 7A are separated by a predetermined distance.

  Similarly to the first frame member 7A, the second frame member 7B is also provided on the light guide plate 5 side between the other end plate 17B in the lateral direction and the other end 5B in the lateral direction of the light guide plate. Similarly to the first frame member 7A, the frame member 7C is provided on the light guide plate 5 side between the longitudinal one end side plate 17C and the light guide plate longitudinal end 5C, and the fourth frame member 7D is also Similarly to the first frame member 7A, it is provided on the light guide plate 5 side between the other end in the vertical direction 17D and the other end in the vertical direction of the light guide plate 5D.

  Thereby, each frame member 7 substantially surrounds the light guide plate 5. Further, the light guide plate 5 is sandwiched between the first frame member 7A and the second frame member 7B in the horizontal direction of the light guide plate 5, and the third frame member 7C and the fourth frame are interposed in the vertical direction of the light guide plate 5. The light guide plate 5 is sandwiched between the frame member 7D.

  Note that, between the frame member 7 and the bottom plate 15 of the housing 3, for example, silicon grease is filled in a thin film shape for thermal conductivity and lubrication.

  The light source 9 faces the side surface of the light guide plate 5 (the surface of the light guide plate lateral end 5A, the surface of the light guide plate lateral other end 5B, the surface of the light guide plate longitudinal end 5C, the surface of the light guide plate longitudinal other end 5D). It emits light and is provided on each frame member 7.

  More specifically, as shown in FIG. 1, the light source 9 is provided on all the frame members 7 in the frame member main body 21. The light source 9 is separated from the light guide plate 5 even when the light guide plate 5 and the frame member 7 are installed in the housing 3 and the light guide plate support 19 of the frame member 7 is in contact with the light guide plate 5.

  The light source 9 is formed between the pair of light guide plate support portions 19 formed by deleting the material at the end portion in the width direction of the frame member main body portion 21 of the first frame member 7A (the material is deleted at the deletion site. A rectangular elongated surface). The light source 9 is composed of, for example, a plurality of LED elements 23, and each LED element 23 is provided side by side with a predetermined interval in the longitudinal direction of the frame member main body 21. In the other frame members 7B, 7C and 7D, the light source 9 is provided in the same manner as the first frame member 7A.

  As the light source 9, a CCFL lamp, an EEFL lamp, or the like may be used instead of or in addition to the LED.

  Further, the light source 9 may be provided only on one frame member (for example, the first frame member 7A) of the four frame members 7, or the light source 9 may be provided on each of the four frame members 7. A structure provided only on two of the frame members 7 (for example, the first frame member 7A and the second frame member 7B, or the first frame member 7A and the fourth frame member 7D). The light source 9 may be provided only on three of the four frame members 7 (for example, the first frame member 7A, the second frame member 7B, and the third frame member 7C). It may be configured as described above. That is, the light source 9 may be configured to be provided on at least one frame member 7 among the frame members 7.

  The first elastic body 11A has one end portion in the expansion / contraction direction engaged with the housing 3 and the other end portion in the expansion / contraction direction engaged with the first frame member 7A. Then, the first elastic body 11A biases the first frame member 7A so that the first frame member 7A presses the light guide plate 5 (presses to the right in FIG. 1).

  The second elastic body 11B, the third elastic body 11C, and the fourth elastic body 11D also have one end in the expansion / contraction direction engaged with the housing 3, and the other end in the expansion / contraction direction is the second frame. The member 7B is engaged with the third frame member 7C and the fourth frame member 7D. Each elastic member biases each frame member 7 so that each frame member 7 presses the light guide plate 5.

  More specifically, the first elastic body 11A is constituted by, for example, a metal compression coil spring. A plurality of (for example, two) first elastic bodies 11A are provided, and are provided between the lateral end plate 17A and the first frame member 7A. One compression coil spring of the two compression coil springs 11A is provided on one end side (lower side in FIG. 1) in the longitudinal direction of the first frame member 7A, and the other of the two compression coil springs 11A. The compression coil spring is provided on the other end side in the longitudinal direction of the first frame member 7A (upper side in FIG. 1).

  In order to prevent the first frame member 7A from freely moving in the longitudinal direction, one end portion in the expansion / contraction direction of the compression coil spring 11A is provided integrally with the lateral one end side plate 17A. It is desirable that the other end in the expansion / contraction direction of the compression coil spring 11A is provided integrally with the first frame member 7A. Further, instead of or in addition to the compression coil spring, the elastic body 11A may be configured using a material having elasticity such as rubber or a silicon gel having high elasticity and high thermal conductivity.

  Similarly to the first elastic body 11A, the second elastic body 11B is provided between the lateral other end side plate 17B and the second frame member 7B. The third elastic body 11C is provided between the longitudinal end plate 17C and the third frame member 7C in the same manner as the first elastic body 11A. The fourth elastic body 11D is provided between the longitudinal other end side plate 17D and the fourth frame member 7D in the same manner as the first elastic body 11A.

  The first elastic body 11A biases the first frame member 7A so that the first frame member 7A moves toward the center of the light guide plate 5 in the lateral direction of the light guide plate 5, and the second The elastic body 11 </ b> B biases the second frame member 7 </ b> B so that the second frame member 7 </ b> B moves toward the center of the light guide plate 5 in the lateral direction of the light guide plate 5. Thus, in the lateral direction of the light guide plate 5, the first frame member 7A and the second frame member 7B sandwich the light guide plate 5 with a predetermined urging force.

  Similarly, in the longitudinal direction of the light guide plate 5, the third frame member 7C and the fourth frame member 7D sandwich the light guide plate 5 with a predetermined urging force.

  In the above description, one end of the elastic body 11 is provided on the side plate 17 of the housing 3. However, the bottom plate 15 of the housing 3 is cut and raised, and the one end of the elastic body 11 is cut and raised. May be engaged, or another part may be provided integrally with the housing 3, and one end of the elastic body 11 may be engaged with this separate part.

  The stopper 13 is made of a metal such as aluminum or an aluminum alloy, for example. The first stopper 13A is provided integrally with the housing 3 inside the housing 3 at a predetermined distance from the first frame member 7A. The first frame member 7A comes into contact with the first stopper 13A when moving in the direction of the lateral one end side plate 17A (left side in FIG. 1).

  Similarly to the first stopper 13A, the second stopper 13B is provided in the housing 3 at a predetermined distance from the second frame member 7B. And when the 2nd frame member 7B moves to the direction (right side in FIG. 1) of the horizontal direction other end side plate 17B, it contacts the 2nd stopper 13B.

  Similar to the first stopper 13A, the third stopper 13C is provided in the housing 3 at a predetermined distance from the third frame member 7C. The third frame member 7C comes into contact with the third stopper 13C when moving in the direction of the one longitudinal end plate 17C (lower side in FIG. 1).

  The fourth stopper 13D is provided in the housing 3 at a predetermined distance from the fourth frame member 7D in the same manner as the first stopper 13A. When the fourth frame member 7D moves in the direction of the other end plate 17D in the vertical direction (upper side in FIG. 1), the fourth frame member 7D comes into contact with the fourth stopper 13D.

  In the lateral direction of the housing 3 and the light guide plate 5, the distance between the first stopper 13A and the second stopper 13B is the outer dimension (light guide plate) between the first frame member 7A and the second frame member 7B. 5 in the horizontal direction, the width of the first frame member 7A, and the width of the second frame member 7B).

  Further, in the longitudinal direction of the housing 3 and the light guide plate 5, the distance between the third stopper 13C and the fourth stopper 13D is based on the outer dimensions of the third frame member 7C and the fourth frame member 7D. Is also getting bigger.

  In the above description, the stopper 13 is a separate part. However, a cut-and-raised portion may be provided on the bottom plate 15 or the like of the housing 3 and the cut-and-raised portion may be used as a stopper.

  In the lighting device 1, a reflective sheet 25 is provided between the bottom plate 15 of the housing 3 and the light guide plate 5. Further, in order to prevent the light guide plate 5 and the frame member 7 from being separated from the casing in the front-rear direction, the lighting device 1 is provided with a light guide plate holder 27 (see FIG. 4).

  Next, operation | movement of the illuminating device 1 is demonstrated. In addition, the illuminating device 1 shall be installed in the image display apparatus.

  When the illumination device 1 is in a horizontal state (a state where the thickness direction of the light guide plate 5 is in the vertical direction; for example, during transportation), each elastic body 11 pushes each frame member 7 with substantially equal force. Unlike the state shown in FIG. 1, the first stopper 13A and the first frame member 7A are separated by a predetermined distance, and the second stopper 13B and the second frame member 7B are separated by a predetermined distance. The third stopper 13C and the third frame member 7C are separated by a predetermined distance, and the fourth stopper 13D and the fourth frame member 7D are separated by a predetermined distance.

  When the lighting device 1 (image display device) is gradually tilted from the horizontal state, the light guide plate 5 and the frame member 7 are gradually moved by gravity. When tilted by a predetermined angle or more with respect to the horizontal state (when tilted; for example, when an image display device is installed), as shown in FIG. 1, one frame member among four frame members 7, The stoppers 13 facing the one frame member are in contact with each other, and the weight of the light guide plate 5 and the frame member 7 is supported by the stopper 13.

  For example, when the lighting device 1 is tilted from the horizontal state by a predetermined angle so that the third frame member 7C is on the lower side and the fourth frame member 7D is on the upper side, the third frame member 7C and the third frame member 7C The stopper 13C comes into contact with each other, and the third stopper 13C supports the weight of the light guide plate 5, the third frame member 7C, and the fourth frame member 7D. In this case, the third elastic body 11C contracts from the horizontal state, the fourth elastic body 11D extends from the horizontal state, and the urging force of the third elastic body 11C is applied to the fourth elastic body 11D. It is bigger than the power. In addition, the first elastic body 11A and the second elastic body 11B maintain the state when they are in the horizontal state.

  Moreover, when the light source 9 emits light, the front surface of the light guide plate 5 emits light, and the lighting device 1 functions as a backlight device.

  According to the illuminating device 1, since the light guide plate 5 is supported by the frame members 7 and the elastic bodies 11 which are separate from each other, the light guide plate is subjected to heat and humidity as shown in FIG. Even if 5 is unevenly deformed unexpectedly, the light guide plate 5 can be prevented from being distorted or warped, and the light source can be destroyed, the light incident efficiency can be reduced, and the brightness can be prevented from being uneven. .

  That is, in the illuminating device 1, the sliding mechanism between the light guide plate 5 and the housing 3 (reflective sheet 25) or the like is supported by sandwiching the light guide plate 5 between the frame members 7 and the elastic bodies 11. Even if the light guide plate 5 is deformed unevenly in this supporting state, the elastic body 11 elastically deforms and absorbs the deformation of the light guide plate 5 while maintaining the sandwiched state. Generation of stress (internal stress) is prevented, the light guide plate 5 is prevented from being damaged or deformed, and the distance between the light source 9 and the light guide plate 5 can be kept substantially constant. Contact with the optical plate 5 is prevented, and destruction of the light source, reduction in light incident efficiency, luminance unevenness, and the like can be prevented.

  Moreover, according to the illuminating device 1, since the stopper 13 is provided, it is possible to prevent the light guide plate 5 from moving indefinitely due to gravity regardless of the installation posture of the illuminating device 1, and to destroy the light source. Etc. can be prevented.

[Second Embodiment]
The lighting device 1a according to the second embodiment is configured in substantially the same manner as the lighting device 1 except that the form of the frame member 31 is different from that of the lighting device 1 according to the first embodiment. Has almost the same effect.

  As shown in FIG. 6, the lighting device 1a according to the second embodiment includes a housing 33, a light guide plate 35, a frame member 31, an elastic body 37 (37A, 37B, 37C, 37D), and a support portion (frame member support). Part) 38 (see FIG. 6) and a stopper 39 (39A, 39B, 39C, 39D).

  The housing 33 is formed in a rectangular bowl shape like the housing 3. The light guide plate 5 is formed in a rectangular flat plate shape. The light guide plate 5 has a thickness direction that matches the thickness direction of the bottom plate 41 of the housing 33, a vertical direction that matches the vertical direction of the housing 33, and a horizontal direction that matches the horizontal direction of the housing 33. Thus, the central portion of the housing 33 is provided inside the housing 33.

  The frame member 31 includes four elongated frame member main bodies 43 (43A, 43B, 43C, 43D) and four frame member coupling bodies 45 (45A, 45B, 45C, 45D). In addition, the frame member 31 is formed in a “B” shape by appropriately combining the frame member coupling body 45 so as to engage with the end portion in the longitudinal direction of the frame member main body 43.

  The frame member 31 is provided in the housing 33 such that each of the four frame member coupling bodies 45 abuts on each of the four corners of the light guide plate 35 and surrounds the light guide plate 35.

  More specifically, the four elongate frame member main bodies 43 have two frame member main bodies 43A and 43B having the same length, and are longer than the two frame member main bodies 43A and 43B and have the same length. It is comprised by the two frame member main bodies 43C and 43D.

  The two longer frame member bodies 43C and 43D are arranged in parallel at a predetermined distance (a distance slightly longer than the length of the shorter frame member body 43A), and the two shorter frame member bodies are arranged. 43A and 43B are arranged at a predetermined distance (a distance slightly longer than the length of the longer frame member main body 43C) in parallel and perpendicularly to the longer frame member main body 43C, and the longer frame member By engaging the frame member coupling body 45 (45A, 45B, 45C, 45D) with the ends of the main bodies 43C, 43D and the ends of the shorter frame member main bodies 43A, 43B, the frame member 31 becomes “B”. It is formed in a letter shape.

  At the engaging portion between the frame member main body 43 and the frame member connecting body 45, the frame member main body 43 is rotated at a slight angle with respect to the frame member connecting body 45, and the frame member main body 43 is frame member in this longitudinal direction. The connector 45 can be moved by a small distance. The slight rotation is performed with the axis extending in the same direction as the thickness direction of the light guide plate 35 in the state where the frame member 31 is installed in the casing 33 in which the light guide plate 35 is installed. Rotation.

  More specifically, in a state where the frame member connecting body 45D is engaged with the frame member main body 43A, the frame member main body 43A extends in a direction orthogonal to the paper surface of FIG. 8 through the engaging portion between the frame member main body 43A and the frame member connecting body 45D. The frame member main body 43A is pivoted very slightly with respect to the frame member coupling body 45D, with the axis being pivoted.

  Further, in a state in which the frame member coupling body 45D is engaged with the frame member main body 43A, the frame member main body 43A moves slightly in the vertical direction with respect to the frame member coupling body 45D.

  The elastic body 37 is configured in the same manner as the elastic body 11 of the lighting device 1, and one end portion in the expansion / contraction direction is engaged with the housing 33, and the other end portion in the expansion / contraction direction is the frame member main body 43. The frame member 31 is urged so that each of the frame member coupling bodies 45 urges the light guide plate 35. The elastic body 37 may be engaged with the frame member connecting body 45 instead of engaging with the frame member main body 43.

  The support part 38 is supporting the frame member 31 (for example, frame member coupling body 45), as shown in FIG. In a state where the frame member 31 and the light guide plate 35 are supported by the support portion 38, the light guide plate 35 and the frame member 31 located at a predetermined first position (for example, an intermediate position shown in FIG. 6) It moves slightly (in parallel) with respect to the housing 33 in the in-plane direction of the light guide plate 35, and slightly rotates around an axis extending in the thickness direction of the light guide plate 35. ing.

  The predetermined first position is a position of the light guide plate 35 or the frame member 31 with respect to the housing 33. In the predetermined first position, the bottom plate 41 of the housing 33 in the vertical direction and the horizontal direction. And the center of the light guide plate 35 coincide with each other. The in-plane direction of the light guide plate 35 is a direction (vertical direction and horizontal direction of the light guide plate 35) orthogonal to the thickness direction of the light guide plate 35.

  The stopper 39 is configured in the same manner as the stopper 13 of the lighting device 1, and is provided inside the housing 33. When the light guide plate 35 and the frame member 31 are located at the predetermined first position, the stopper 39 is separated from the frame member 31 by a predetermined distance (see FIG. 6).

  On the other hand, when the light guide plate 35 and the frame member 31 are positioned at a predetermined second position (for example, the unevenly distributed position shown in FIG. 7) different from the predetermined first position, the stopper 39 is It comes into contact with the member 31. The light guide plate 35 and the frame member 31 cannot be rotated (rotation about an axis parallel to the thickness direction of the light guide plate 35). Further, when the light guide plate 35 and the frame member 31 are located at the second position, movement (parallel movement) between the light guide plate 35 and the frame member 31 in the in-plane direction of the light guide plate is restricted. That is, the light guide plate 35 and the frame member 31 can move in parallel in a direction away from the abutting stopper 39 (39B, 39C) (upward or leftward in FIG. 7), but the abutting stopper 39 ( 39B, 39C) cannot be moved in the pressing direction.

  In the state where the light guide plate 35 and the frame member 31 are located at the second position, as shown in FIG. 7, the light guide plate 35 and the frame member 31 are diagonally right compared to the state shown in FIG. The frame member main body 43C is in contact with the stopper 39C, and the frame member main body 43B is in contact with the stopper 39B. In the state shown in FIG. 7, the elastic bodies 37B and 37C are compressed compared to the state shown in FIG.

  More specifically, the frame member main body 43 is formed in an elongated rectangular parallelepiped shape with a metal extrusion material.

  The frame member coupling body 45 is generated by, for example, pressing, bending or drawing a metal material such as flat steel, and as shown in FIG. 11 and FIG. The bottom portion 47 is configured to include a side portion 49 that rises from the one surface in the thickness direction by a predetermined height. If the frame member connecting body 45 satisfies the function in terms of strength, the frame member connecting body 45 is formed from an aluminum plate material, or the frame member connecting body 45 is an injection molded product of aluminum or synthetic resin. There may be.

  When the bottom portion 47 of the frame member coupling body 45 is viewed from the thickness direction, as shown in FIG. 8, one corner of the square has a stepped shape. That is, the bottom 47 has a polygonal shape surrounded by the first long side 51A, the second long side 51B, and the first short side 53A to the eighth short side 53H.

  The lengths of the first long side 51A and the second long side 51B are equal to each other, for example (the length of the first long side 51A and the length of the second long side 51B may be different from each other). ), The first long side 51A and the second long side 51B are orthogonal to each other, and one end of the first long side 51A and one end of the second long side 51B intersect at one point. ing. In practice, the part of one end of the first long side 51A and the one end of the second long side 51B has an arc shape, but here, for convenience of explanation, it is an arc. The following explanation will be continued as if not.

  The first short side 53A is orthogonal to the first long side 51A, and extends from the other end of the first long side 51A to the same side as the second long side 51B. The second short side 53B is orthogonal to the first short side 53A, and the second long side from the end of the first short side 53A (the end opposite to the first long side 51A). It extends toward 51B. The third short side 53C is orthogonal to the second short side 53B, and extends from the end of the second short side 53B (the end opposite to the first short side 53A) to the first short side. It extends toward the opposite side to the 53A side. The fourth short side 53D is orthogonal to the third short side 53C, and extends from the end of the third short side 53C (the end opposite to the second short side 53B) to the second long side. It extends toward 51B. The fifth short side 51E is orthogonal to the fourth short side 53D, and extends from the end of the fourth short side 53D (the end opposite to the third short side 53C) to the third short side. It extends toward the opposite side to the 53C side. The sixth short side 53F is orthogonal to the fifth short side 53E, and extends from the end of the fifth short side 53E (the end opposite to the fourth short side 53D) to the second long side. It extends toward 51B. The seventh short side 53G is orthogonal to the sixth short side 53F and extends from the end of the sixth short side 53F (the end opposite to the sixth short side 53F) to the fifth short side. It extends toward the opposite side to the 53E side. The eighth short side 53H is orthogonal to the seventh short side 53G and extends from the end of the seventh short side 53G (the end opposite to the sixth short side 53F) to the second long side. It extends to the other end of 51B.

  The length of the first short side 53A and the length of the eighth short side 53H are equal to each other, and the length of the second short side 53B and the length of the seventh short side 53G are equal to each other. The lengths of the third short side 53C and the sixth short side 53F are equal to each other, and the lengths of the fourth short side 53D and the fifth short side 53E are equal to each other. It is equal to.

  Furthermore, the sum of the length of the first short side 53A, the length of the third short side 53C, the length of the fifth short side 53E, and the length of the seventh short side 53G, and the length of the second long side 51B Are equal to each other, and the sum of the length of the second short side 53B, the length of the fourth short side 53D, the length of the sixth short side 53F, and the length of the eighth short side 53H; The lengths of the first long sides 51A are equal to each other.

  The support portion 38 shown in FIG. 6 includes a dharma hole 55 (55A) and columnar pins 57 (57A, 57B) provided integrally with the housing 33.

  Of the four frame member coupling bodies 45, the Dharma hole 55A is provided in the frame member coupling body 45D and the frame member coupling body 45B that are located at diagonal positions.

  The dharma hole 55A passes through the bottom 47 of the frame member coupling body 45D in the thickness direction. When viewed in the penetration direction of the Dalma hole 55A, the Dalma hole 55A has a shape in which a large-diameter circle and a small-diameter circle are appropriately combined. To explain further, a large-diameter circle and a small-diameter circle whose center coincides with the large-diameter circle are drawn on one plane, and the small-diameter circle is straightened by a predetermined distance from the large-diameter circle. When the movement is made, the shape represented by the movement path of the large diameter circle and the small diameter circle is the shape of the Dharma hole. The moving distance of the small-diameter circle is a distance that is about the radius of the large-diameter circle, and more broadly, a movement that creates a linear portion between the small-diameter circle arc and the large-diameter circle arc. Distance.

  The dharma hole 55A is, for example, arranged such that the movement trajectory of the center of the small-diameter circle is positioned on a straight line that bisects the intersection angle between the first long side 51A and the second long side 51B. It is provided at the bottom 47 of the member coupling body 45D. Further, in the dharma hole 55A, the large-diameter circle is located on the side of the intersection between the first long side 51A and the second long side 51B, and the small-diameter circle is the fourth short side 53D and the fifth side. It is provided on the bottom 47 of the frame member coupling body 45D so as to be positioned on the side of the intersection with the short side 53E.

  The dharma hole 55B is also provided in the bottom 47 of the frame member coupling body 45B in the same manner as the dharma hole 55A.

  Two pins 57 are provided corresponding to the dharma holes 55. As shown in FIG. 10, the pins 57 </ b> A stand from the bottom plate 41 of the housing 33 and are integrally provided in the housing 33 by caulking, for example, within the housing 33. Further, the pin 57A passes through the dharma hole 55A. Similarly, the pin 57B is also provided integrally with the housing 33 and penetrates the dharma hole 55B.

  As shown in FIG. 6, when the light guide plate 35 and the frame member 31 are located at the predetermined first position, the pin 57A is separated from the inner periphery of the Dalma hole 55A and has a large diameter. It penetrates the circle. Further, the pin 57B also penetrates the large-diameter circle of the Dalma hole 55B away from the inner periphery of the Dalma hole 55B.

  As shown in FIG. 7, when the light guide plate 35 and the frame member 31 are located at a predetermined second position, the pin 57B penetrates the small-diameter circle of the Dharma hole 55B. The outer diameter of the pin 57B and the inner diameter of the small circle of the Dharma hole 55B are substantially equal to each other. Therefore, if the stopper 39 does not exist, the light guide plate 35 and the frame member 31 rotate about the central axis of the pin 57B. Actually, since the stopper 39 exists, it cannot be rotated as described above. On the other hand, when the light guide plate 35 and the frame member 31 are located at a predetermined first position (see FIG. 6), the light guide plate 35 and the frame member 31 are upward or leftward as described above. Can be translated.

  When the light guide plate 35 and the frame member 31 are moved obliquely upward to the left from the state shown in FIG. 7 and the pin 57B passes through the small-diameter circle of the Dharma hole 55B, the state is the same as that shown in FIG. Become.

  Here, the engagement between the frame member main body 43 and the frame member coupling body 45 in the frame member 31 will be described in detail.

  The four frame member coupling bodies 45 are formed in the same shape except for the dharma hole 55. Further, the four frame member main bodies 43 are formed in the same shape, except for the length.

  Therefore, the engagement between the frame member coupling body 45D and the frame member main body 43A will be described as an example (see FIGS. 8 and 9).

  From the respective sides 51A, 51B, 53B, 53D, 53E, 53G of the frame member coupling body 45D, the side portions 491A, 491B, 493B, 493D, 493E, 493G stand up perpendicularly.

  One end in the thickness direction of the end of the frame member main body 43A (the end on the frame member connecting body 45D side) and the vicinity thereof are in surface contact with the bottom 47 of the frame member connecting body 45D. The other surface is in surface contact with the bottom plate 41 of the housing 33 and enters between the side portion 491A and the side portion 493B. The distance between the side portion 491A and the side portion 493B is slightly larger than the width of the frame member main body 43A.

  An oval through hole 59 is formed in the vicinity of the end of the frame member main body 43A (the end on the frame member coupling body 45D side). The through hole 59 is formed long in the longitudinal direction of the frame member main body 43A at the center of the frame member main body 43A.

  A columnar pin 61 stands from the bottom 47 of the frame member main body 43A. The pin 61 is integrally provided on the bottom 47 by caulking or the like, and enters the through hole 59. The width of the through hole 59 and the outer diameter of the pin 61 are substantially equal to each other.

  Further, in a state where the end of the frame member main body 43A enters between the side portion 491A and the side portion 493B and the pin 61 enters the through hole 59, the side portion 491A and the side portion 491A are arranged on both sides in the width direction of the frame member main body 43A. A gap is formed between the side portion 493B.

  Thereby, the frame member main body 43A is slightly rotated with respect to the frame member coupling body 45D as described above, and can be slightly moved in the longitudinal direction.

  In addition, other parts of the frame member main body 43 and other parts of the frame member connecting body 45 are engaged in the same manner as in the case of the frame member connecting body 45D and the frame member main body 43A, so that the frame member 31 is formed. Yes.

  In the state where the frame member 31, the light guide plate 35, and the elastic body 37 are installed in the housing 33, the side portion 493 </ b> D and the side portion 493 </ b> E of the frame member coupling body 45 </ b> D are connected to one corner of the light guide plate 35 and the vicinity thereof. The light guide plate 35 is biased diagonally to the right. Similarly, the side portion 493D and the side portion 493E of the frame member coupling body 45A abut against the light guide plate 35 to bias the light guide plate 35 obliquely upward to the right, and the side portion 493D of the frame member coupling body 45B The side portion 493E abuts on the light guide plate 35 and biases the light guide plate 35 obliquely to the left, and the side portion 493D and the side portion 493E of the frame member coupling body 45C abut on the light guide plate 35. 35 is biased diagonally to the left.

  By the way, in the illuminating devices 1 and 1a, the light source (LED element) 9 is directly provided on the frame members 7 and 31, but actually, as shown in FIG. The frame members 7 and 31 are provided via the substrate 63.

  Next, operation | movement of the illuminating device 1a is demonstrated.

  When the lighting device 1a is in a horizontal state as shown in FIG. 6, each elastic body 37 pushes the frame member (each frame member main body 43) 31 with substantially equal force, and the stopper 39A and the frame member main body 43A are The stopper 39B and the frame member main body 43B are separated by a predetermined distance, the stopper 39C and the frame member main body 43C are separated by a predetermined distance, and the stopper 39D and the frame member main body 43D are separated from each other. Are separated by a predetermined distance.

  When the lighting device 1 is tilted from the horizontal state as shown in FIG. 7, as shown in FIG. 7, the pin 57B passes through the small-diameter circle of the Dharma hole 55B, the frame member main body 43B contacts the stopper 39B, and the frame The member main body 43C abuts against the stopper 39C, and the weight of the light guide plate 35 and the frame member 31 is supported by the stopper 39.

  Then, even if the light guide plate 35 is deformed unevenly and unexpectedly due to heat or humidity, the light guide plate 35 can be prevented from being distorted or warped, and the light source can be destroyed. It is possible to prevent a decrease in light incident efficiency and uneven brightness.

  By the way, the illuminating device 1 may be suitably modified to have the form shown in FIGS. 15 and 16.

  In the lighting device 1 b shown in FIG. 15, four frame members 7 are installed on the light guide plate 5, and two frame members 7 </ b> C and 7 </ b> B out of the four frame members 7 are in contact with the stopper 13. The two frame members 7A and 7D are urged by the elastic body 11.

  In the illuminating device 1c shown in FIG. 16, in the illuminating device 1c shown in FIG. 15, the frame member 7B and the stopper in contact with the frame member 7B are deleted, and a pin 65 is provided instead, and the light guide plate 5 of the pin 65 is applied. Touching. The pin 65 is provided integrally with the housing 3.

  The lighting devices 1, 1 a, 1 b, and 1 c include a housing, a light guide plate provided inside the housing, and a light guide plate provided in the housing on one side of the light guide plate in the vertical direction or the horizontal direction. A first frame member comprising: at least two light guide plate support portions that are in contact with each other; and a light source that is separated from the light guide plate at a portion different from the light guide plate support portion and emits light toward a side surface of the light guide plate; The at least two light guide plate support portions that are provided in the casing on the other side of the light guide plate in the vertical direction or the horizontal direction) and are in contact with the light guide plate are separated from the light guide plate at different portions. A second frame member provided with a light source that emits light toward the side surface of the cage light guide plate, and one end portion in the expansion / contraction direction abuts the casing, and the other end portion in the expansion / contraction direction is the first frame member. So that the first frame member presses the light guide plate A first elastic body for urging one frame member, and one end in the expansion / contraction direction abuts on the housing and the other end in the expansion / contraction direction abuts on the second frame member. Is an example of an illuminating device having a second elastic body that urges the second frame member so as to press the light guide plate in a direction opposite to the first frame member.

  In this lighting device, movement of the first frame member, the light guide plate, and the second frame member by gravity (moving in the urging direction of the second elastic body) due to gravity is provided in the first device. A first stopper that stops halfway by coming into contact with the frame member, and a movement of the second frame member, the light guide plate, and the first frame member that are provided in the casing by gravity (the urging of the first elastic body) There is a case in which a second stopper that stops the movement in the direction in the middle by abutting on the second frame member is provided.

  The lighting devices 1, 1 a, 1 b, and 1 c include a housing, a light guide plate provided inside the housing, and a light guide plate support portion that is provided in the housing by the light guide plate and is in contact with the light guide plate. And a light source that emits light toward the light guide plate, and an elastic body that urges the frame member so that the frame member presses the light guide plate. It is an example of the illuminating device which is comprised so that it may support and the deformation | transformation of a light guide plate may be absorbed by the elastic deformation of an elastic body.

  This lighting device may be provided with a stopper that restricts movement of the frame member and the light guide plate by contacting the frame member. The stopper prevents the light guide plate and the frame member from moving more than a predetermined distance due to gravity.

1, 1a, 1b, 1c Illuminating device 3, 33 Case 5, 35 Light guide plate 7 (7A, 7B, 7C, 7D), 41 Frame member 9 Light source 11 (11A, 11B, 11C, 11D), 37 Elastic body 13 (13A, 13B, 13C, 13D), 39 Stopper 19 Light guide plate support part 38 Support part 43 Frame member main body 45 Frame member coupling body

Claims (5)

A light guide plate;
A frame member provided on a side of the light guide plate, and provided with a light guide plate support portion that is in contact with the light guide plate; and a light source that emits light toward the light guide plate;
An elastic body that biases the frame member so that the frame member presses the light guide plate;
Have
An illumination device configured to support the light guide plate with an urging force of the elastic body and to absorb deformation of the light guide plate by elastic deformation of the elastic body. A light guide plate;
A first frame member that is provided on one side of the light guide plate and includes a light guide plate support portion that is in contact with the light guide plate; and a light source that emits light toward the light guide plate;
A second frame member that is provided on the other side of the light guide plate and includes a light guide plate support portion that is in contact with the light guide plate; and a light source that emits light toward the light guide plate;
A first elastic body that biases the first frame member such that the first frame member presses the light guide plate;
A second elastic body for urging the second frame member so that the second frame member presses the light guide plate in a direction opposite to the first frame member;
A lighting device comprising: A housing formed in a rectangular bowl shape;
A light guide plate formed in a rectangular flat plate and provided inside the housing;
A first frame member provided in the housing on one side in the lateral direction of the light guide plate, comprising at least two light guide plate support portions in contact with the light guide plate;
A second frame member provided in the housing on the other side in the lateral direction of the light guide plate, comprising at least two light guide plate support portions in contact with the light guide plate;
A third frame member provided in the housing on one side in the longitudinal direction of the light guide plate, comprising at least two light guide plate support portions in contact with the light guide plate;
A fourth frame member provided in the casing on the other side in the longitudinal direction of the light guide plate, comprising at least two light guide plate support portions in contact with the light guide plate;
A light source that is provided on at least one of the frame members and emits light toward the light guide plate;
The first end is engaged so that one end engages with the housing, the other end engages with the first frame member, and the first frame member presses the light guide plate. A first elastic body for biasing the frame member;
The second end is engaged so that one end engages with the housing, the other end engages with the second frame member, and the second frame member presses the light guide plate. A second elastic body for biasing the frame member;
The third end is engaged so that one end engages with the housing, the other end engages with the third frame member, and the third frame member presses the light guide plate. A third elastic body for biasing the frame member;
The fourth end is engaged so that one end engages with the housing, the other end engages with the fourth frame member, and the fourth frame member presses the light guide plate. A fourth elastic body for urging the frame member;
A first stopper provided on the housing at a predetermined distance away from the first frame member, with which the first frame member abuts;
A second stopper provided on the housing at a predetermined distance away from the second frame member and in contact with the second frame member;
A third stopper provided on the housing at a predetermined distance away from the third frame member, with which the third frame member abuts;
A fourth stopper provided on the housing at a predetermined distance away from the fourth frame member and in contact with the fourth frame member;
A lighting device comprising: A housing formed in a rectangular bowl shape;
A light guide plate formed in a rectangular flat plate and provided inside the housing;
The four elongated frame member bodies and the four frame member coupling bodies are combined to form a “B” shape, and each of the four frame member coupling bodies contacts each of the four corners of the light guide plate. A frame member provided in the housing so as to contact and surround the light guide plate;
One end is engaged with the housing, the other end is engaged with at least one of the frame member main body and the frame member coupling body, and each of the frame member coupling bodies has the light guide plate. An elastic body for urging the frame member so as to be urged;
When the light guide plate and the frame member are located at a predetermined first position with respect to the housing, the light guide plate and the frame member are in-plane with respect to the housing. A support portion that supports the frame member so that the frame member moves slightly in a direction and rotates around an axis parallel to the thickness direction of the light guide plate;
When the light guide plate and the frame member are located at a predetermined second position with respect to the housing, the frame member is in contact with the frame member. A stopper that contacts,
A lighting device comprising: The lighting device according to any one of claims 1 to 4,
An image display panel provided on the front side of the lighting device and using the lighting device as a backlight;
An image display device comprising: