JPWO2013065534A1 - Illumination device, backlight, and liquid crystal display device - Google Patents

Abstract

  The illumination device A has the substrate (32) outside the positioning boss (53) so that the light source and the light collecting member can be accurately positioned and the light source and the light collecting member can be easily fixed to the housing. A cylindrical first through hole (321) having the same inner diameter as the diameter, and a long through hole second through hole (322) extending along a line connected to the first through hole (321), and positioning The tip portion protruding from the first through hole (321) and the second through hole (322) of the boss (53) is inserted into the through holes (3111, 3112) formed in the housing (1) and snap fit ( 54) is engaged with the engaging portion (3110).

Description

  The present invention relates to an illumination device using an LED as a light source, a backlight using the illumination device, and a liquid crystal display device.

  In recent years, light emitting diodes (LEDs) are often used as light sources for lighting devices. The LED has many advantages such as small size, long life, low power consumption due to high luminous efficiency, and no use of mercury, compared to fluorescent lamps (cold cathode tubes, etc.) that have been used conventionally. Yes.

  For example, the lighting device is attached to the ceiling of a living room and used as indoor lighting, or disposed on the back surface of a liquid crystal display device and used as a backlight. Since the LED is a point light source, a luminance distribution is formed in the light emitted from the light emitting surface, and uneven luminance tends to occur. Therefore, in order to suppress luminance unevenness caused by the fact that the LED is a point light source, a reflecting member is disposed on the surface facing the light emitting surface, and the light emitting surface and / or the surface of the reflecting member is aligned. An illuminating device in which LEDs are arranged to emit light in a direction has been proposed.

  In the illuminating device, since the light irradiation direction of the LED and the light emitting surface of the illuminating device intersect, the light flux density on the light emitting surface changes depending on the distance from the LED. When the luminous flux density changes in this way, the light emitted from the light exit surface is visually recognized as light with uneven brightness. In such an illuminating device, it is known that the luminous flux on the light exit surface can be made uniform or substantially uniform by narrowing the irradiation angle of the light emitted from the LED, and a method of attaching a collimator lens to the LED is proposed. (See, for example, JP 2009-205968 A).

  The attachment of the substrate on which the LED of the illumination device is mounted and the collimator lens will be described with reference to the drawings. FIG. 11 is a view showing a mounting state of a substrate and a collimator lens used in a conventional lighting device. As shown in FIG. 11, the board 932 on which the LED 933 is mounted is screwed and fixed to the chassis 91 of the lighting device with the first screw Sc1. Then, the collimator lens 95 is fixed to the chassis 91 with a second screw Sc2 so as to face the front of the LED 933. As shown in FIG. 11, the second screw Sc <b> 2 that fixes the collimator lens 95 passes through the through hole formed in the substrate 932. As described above, the substrate 932 on which the LED 933 is mounted and the collimator lens 95 are firmly fixed to the chassis 91 with screws.

JP 2009-205968 A

  In the conventional illuminating device, in order to fix the board | substrate 932 and the collimator lens 95 to the chassis 91, 1st screw Sc1 and 2nd screw Sc2 are required, and a number of structural members increases. Moreover, since there are many screwing points, the labor of manufacture increases correspondingly, production efficiency falls, and manufacturing cost becomes high.

  The substrate 932 is fixed to the chassis 91 with the first screw Sc1, and the collimator lens 95 is fixed to the chassis 91 with the second screw Sc2. For this reason, the substrate 932 and the collimator lens) 5 are fixed to the chassis 91 with high positional accuracy. However, the substrate 932 and the collimator lens 95 are not directly fixed, and if the accuracy of the chassis 91 is low, the relative position between the substrate 932 and the collimator lens 95 may deviate from the plan. If the relative position between the substrate 932 and the collimator lens 95 is shifted, the light emitted from the LED 933 may not be accurately irradiated onto the collimator lens 95, which may cause uneven brightness of the light emitted from the illumination device.

  Further, when the board 932 and the collimator lens 95 are screwed to the chassis 91, the chassis 91 may be inclined with respect to the horizontal depending on the shape of the lighting device. When the chassis 91 has a large inclination, a temporary fixing member for temporarily fixing the substrate 932 and the collimator lens 95 to the chassis 91 is necessary for screwing, which causes an increase in manufacturing steps and an increase in members required for manufacturing. And may increase costs.

  Therefore, the present invention can accurately position the light source and the collimator lens, and can easily fix the light source and the collimator lens to the casing, and the backlight device or the liquid crystal display using such an illumination device. An object is to provide an apparatus.

  In order to achieve the above-mentioned object, the present invention is configured so that a housing having a reflective portion facing a light emitting surface, a substrate on which LEDs are arrayed and mounted, and a surface of the substrate on which the LEDs are mounted are opposed. A light collecting member disposed, and the light collecting member includes two positioning bosses protruding from a facing surface facing the substrate, and a snap fit protruding from a position away from the positioning boss. The substrate has a cylindrical first through hole having an inner diameter equal to the outer diameter of the positioning boss, and a long through hole shaped second through hole extending along a line connected to the first through hole. And inserting a tip portion protruding from the first through hole and the second through hole of the positioning boss into the through hole formed in the housing, and the snap fit to the engaging portion formed in the housing. Engaging the substrate and The condensing member is light from the LED to provide a lighting device attached to the housing along the reflective portion.

  According to this configuration, since the substrate and the light collecting member are combined in a state where the substrate and the light collecting member are positioned relatively accurately in advance, the substrate and the light collecting member can be attached to the housing by a simple method such as a boss and a snap fit. Compared to the case where and are attached separately, the assembly work is reduced. In addition, since the screws for temporarily fixing the substrate and other members can be eliminated, the number of components can be reduced accordingly. In addition, since the boss is used to accurately position the substrate and the condensing member, and the condensing member and the housing, it is difficult to waste light emitted from the LED, and the luminance unevenness is stable and the luminance is high. It is possible to emit light.

  Further, it is possible to screw the substrate after attaching all the substrates and the light collecting member to the housing. From this, it is possible to separate the process of attaching the substrate and the light collecting member to the housing and the screwing process, so that the screwing process, which is relatively easy to work with the machine, can be summarized. Contributes to the automation of manufacturing processes.

  In the above configuration, the positioning boss is formed with a length that does not come out of the through hole of the housing when the substrate is rotated about the snap fit so as to be separated from the housing.

  According to this configuration, even when the surface of the housing to which the substrate and the light collecting member are attached is not horizontal, the substrate and the light collecting member can be accurately positioned without separately preparing screws and other temporary fixing members. Therefore, it can be applied to specially shaped housings.

  The condensing member and the substrate may be fixed to the housing by screwing together.

  The said structure WHEREIN: Two or more said snap fits are formed in the said opposing surface, and the said condensing member and the said board | substrate are fixed by the said positioning boss | hub and the said snap fit. According to this configuration, since no fixing screw is used, the number of constituent members can be reduced and the screwing step can be eliminated, so that the cost can be reduced accordingly. In addition, since the light does not pass through the condensing member having a high transmittance or does not pass through the screw, it is possible to increase the light utilization rate accordingly.

  The said structure WHEREIN: You may fix the said board | substrate to the said housing | casing with an adhesive means. Examples of the bonding means include a double-sided tape and an adhesive.

  In the illumination device having the above configuration, the substrate on which the LED is mounted and the light collecting member are attached to the outer surface side of the attachment portion formed in a polygonal cylindrical shape disposed in the central portion of the housing. It may be.

  In the illumination device having the above configuration, the housing includes a rectangular flat plate portion, and the substrate and the light collecting member are attached to a wall body protruding from at least one side of the flat plate portion. May be.

  Such an illuminating device can be used as a backlight of a back-lighting such as a light-emitting signboard or a back-lighted image display device such as a liquid crystal display device.

  According to the illumination device of the present invention, the light source and the light collecting member can be accurately positioned, and the light source and the light collecting member can be easily fixed to the housing, and the back using such an illumination device. A light or liquid crystal display device can be provided.

It is a disassembled perspective view of the illuminating device concerning this invention. It is the figure which looked at the light emission part used for the illuminating device shown in FIG. 1 from the side surface. It is the figure seen from the downward direction of the light emission part shown in FIG. It is the front view which expanded the flat plate part of the angle for attachment. It is sectional drawing cut | disconnected by the VV line | wire of the angle for attachment shown in FIG. It is the figure which expanded the board | substrate and the condensing member attached to the angle for attachment. It is a figure of the state which decomposed | disassembled the board | substrate, the condensing member, and the angle for attachment. It is sectional drawing of the condensing member used for the other example of the illuminating device concerning this invention, and a board | substrate. It is a disassembled perspective view which shows the other example of the illuminating device concerning this invention. It is a disassembled perspective view which shows an example of the liquid crystal display device concerning this invention. It is a figure which shows the attachment state of the board | substrate and collimator lens which are used for the conventional illuminating device.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is an exploded perspective view of a lighting device according to the present invention. A lighting device A shown in FIG. 1 is a ceiling light attached to a ceiling surface, and an upper portion in the drawing is attached to the ceiling surface. In the following description, when explaining the vertical direction, the vertical direction in the state of FIG. 1 will be described as a reference except when otherwise described, and the vertical direction in the state of FIG. (Vertical direction) or the thickness direction and lateral direction of the lighting device may be described as the H direction (horizontal direction).

  As shown in FIG. 1, the illuminating device A is provided with the chassis 1, the drive control part 2, the light emission part 3, and the cover 4, and is arrange | positioned in this order from the top. The chassis 1 is a casing attached to the ceiling surface, and is a disk-shaped member made of aluminum. A power connector (not shown) that is provided on the ceiling surface and supplies power passes through the central portion of the chassis 1. A surface opposite to the surface facing the ceiling surface of the chassis 1 is formed as a reflecting surface (reflecting portion) that efficiently reflects the light emitted from the light emitting portion 3 and is subjected to surface treatment. In addition, as this surface treatment, for example, a method of attaching a highly reflective sheet such as foamed PET or a white paint may be applied.

  The drive control unit 2 includes circuits such as a power supply circuit that supplies power to the light emitting unit 3 and a control circuit that performs lighting control. When the drive control unit 2 is attached to the chassis 1, the insulating sheet 20 for suppressing leakage to the chassis 1, a circuit board 21 on which a power supply circuit, a control circuit, and the like are mounted, and a support unit that supports the circuit board 21 22 and 23. The drive control unit 2 also includes a circuit that is electrically connected to a power connector (not shown) provided on the ceiling surface and converts the supplied power into power corresponding to the light emitting unit 3.

  The light emitting unit 3 is fixed to the chassis 1 with screws, and the drive control unit 2 is fixed to the light emitting unit 3 with screws. In a state where the drive control unit 2 and the light emitting unit 3 are attached to the chassis 1, the cover 4 is attached so as to surround the side of the chassis 1 where the drive control unit 2 and the light emitting unit 3 are attached. The cover 4 is fixed by engaging the outer peripheral portion with the chassis 1 and screwing the central portion to the light emitting unit 3. The cover 4 is a light exit surface from which light emitted from the light emitting unit 3 is emitted, and is made of a light resin with high transmittance such as acrylic resin such as PMMA, polystyrene, polycarbonate, etc., but is not limited thereto. . The cover 4 may be a surface processed so that emitted light is diffused.

  The light emitting unit 3 includes an attachment angle 31, a substrate 32 that is fixed to the attachment angle 31 and on which an LED 33 (described later) as a light source is mounted, and a condensing member 5 that is disposed so as to cover the substrate 32. I have. In addition, it can be said that the board | substrate 32 with which LED33 was mounted, and the condensing member 5 comprise the light source part. The light emitting unit 3 will be described with reference to a new drawing. 2 is a view of a light emitting unit used in the illumination device shown in FIG. 1 as viewed from the side, and FIG. 3 is a view of the light emitting unit as viewed from below in FIG.

  The mounting angle 31 of the light emitting unit 3 is formed by cutting and bending a metal plate. As shown in FIG. 1 and the like, the mounting angle 31 includes a rectangular flat plate portion 311, a plate-like fixing portion 312 extending from one long side of the flat plate portion 311, and a flat plate from the other long side of the flat plate portion 311. A holding portion 313 extending to the opposite side to the fixing portion 312 with respect to the portion 311 is provided.

  The mounting angle 31 is formed in a regular octagonal cylindrical shape by connecting the short sides of the adjacent flat plate portions 311 together. As described above, when the flat plate portion 311 is connected in a regular octagonal cylindrical shape, the fixing portion 312 extends toward the outside of the regular octagon, and the holding portion 313 extends toward the inside of the regular octagon. Moreover, although the regular octagonal thing is shown in the illuminating device A, it is not limited to this. It may be a shape that can hold a flat substrate in a cylindrical shape, and may be a shape close to a circle (for example, a regular hexagon, a regular dodecagon, etc.).

  Further, as shown in FIG. 1, the mounting angle 31 is divided into two members so that four flat plate portions 311 are included. Then, the divided members are manufactured by pressing metal plates one by one, and then joined to form a regular octagonal cylindrical shape. Moreover, in the illuminating device A of FIG. 1, although the attachment angle 31 is divided | segmented into two members, it is not limited to it, You may divide | segment into three or more, but the divided member is The number of divisions having the same shape (for example, 2, 4, and 8 in the case of a regular octagon) is preferable. In addition, by making the divided | segmented member into the same shape, the shape of the metal plate of material and the metal mold | die for press work can be unified, and manufacturing cost can be reduced.

  As shown in FIGS. 2 and 3, the substrate 32 is arranged so that the LED 33 is on the outer side of the regular octagonal cylindrical shape on the flat plate portion 311 of the mounting angle 31, and the longitudinal direction is the H direction. Attached to and fixed.

  The light emitting part and its mounting part will be described in more detail. 4 is an enlarged front view of the flat plate portion to which the light source portion is attached, and FIG. 5 is a cross-sectional view taken along the line VV of the flat plate portion shown in FIG. As shown in FIG. 4, in the flat plate portion 311 of the mounting angle 31, the light collecting member 5 is disposed on the most front side. And since the condensing member 5 is transparent, the condensing member 5 and the board | substrate 32 arrange | positioned at the back surface of the condensing member 5 and LED33 are also shown as the continuous line.

  As shown in FIG. 5, in the mounting angle 31, the upper fixing portion 312 is fixed to the chassis 1 with a screw Bt, and the cover 4 is attached to the holding portion 313 with the screw Bt. The flat plate portion 311 is provided with a cut-and-raised portion 314 protruding inside the regular octagonal cylindrical shape, and the circuit board 21 is fixed to the cut-and-raised portion 314 with screws Bt.

  In the illuminating device A provided with such an attachment angle 31, since the circuit board 21 is disposed at the central portion, the central portion is a non-light emitting portion. In the illumination device A, it is preferable that the non-light-emitting portion is small, and the smaller the one side of the regular octagon of the mounting angle 31 is, the smaller the non-light-emitting portion is.

  As shown in FIG. 4, chip-shaped LEDs 33 are mounted on a rectangular substrate 32 attached to the flat plate portion 311. The LED 33 has a rectangular parallelepiped package having a square shape in plan view. On the substrate 32, the LEDs 33 are linearly arranged in the longitudinal direction, and the linear arrangement of the LEDs 33 is arranged in three stages in the lateral direction. Thus, by arranging the LED 33, the length of the substrate in the longitudinal direction can be shortened. Thereby, the length of one side of the regular octagon of the mounting angle 31 can be reduced, and the non-light-emitting portion of the illumination device A can be reduced.

  As shown in FIGS. 4 and 5, the substrate 32 has three rows of LEDs 33 arranged in the H direction arranged in the V direction. As shown in FIG. 4, the LEDs 33 at each stage are arranged in the H direction. The LEDs 33 in each stage are arranged at substantially equal intervals, and the number of LEDs 33 is larger in the central stage than in the upper and lower stages. Usually, when the luminous efficiency is the same, the larger the light emitting surface area, that is, the larger the number of LEDs 33, the larger the amount of light emitted. In the case of the light emitting unit 3 in which the LEDs 33 as shown in FIG. 4 are arranged, the light emitted from the central portion is brighter than the light emitted from the upper and lower stages.

  When the light emitted from the light source unit having a plurality of stages of LEDs 33 arranged in the H direction in the V direction is condensed by a conventional collimator lens, the light is directed upward from the upper LED 33. The irradiation range in the V direction of light is wide from the lower LED 33 to the light going downward.

  The LED 33 is a point light source, and the emitted light is divergent light (Lambertian light distribution). The light emitted from the LED 33 has a high luminous flux density in the vicinity of the mounting angle 31. The light flux density of the light applied to the chassis 1 is higher in the light emitted from the LED 33 in the stage near the chassis 1 than in the light emitted from the LED 33 in the other stage. The light having a high luminous flux density is reflected by the chassis 1 and emitted from the cover 4. Further, the light flux density of the light transmitted through the vicinity of the mounting angle 31 of the cover 4 is high from the light emitted from the LED 33 at the stage close to the cover 4.

  From the above, in order to prevent the light flux density of the light transmitted through the cover 4 from being close to the mounting angle 31 from being excessively high, the light emitting unit 3 is arranged at a stage close to the chassis 1 and the cover 4 of the substrate 32. The number of LEDs 33 is smaller than that of the central stage.

  In this way, by changing the number of the LEDs 33 arranged depending on the step of the substrate 32 in the V direction, the variation (luminance unevenness) in the light flux density of the light emitted from the cover 4 can be suppressed. However, it is difficult to sufficiently suppress the luminance unevenness of the light emitted from the cover 4 (that is, to the extent required as a lighting device) only by adjusting the number of LEDs 33 in each stage.

  Further, in the illuminating device configured to emit light from the LED 33 along the cover 4 that is a light emitting surface, the light inclined at a predetermined angle (for example, 30 degrees with respect to the central axis) from the LED 33 is the chassis 1 and / or It is known that as the distance from the position reaching the cover 4 to the LED 33 increases, that is, as the parallel light is approached, the change in the light flux density due to the distance decreases. Therefore, in the illuminating device A, the light-condensing member 5 as shown in FIG.

  Below, the condensing member 5 is demonstrated with reference to drawings. FIG. 6 is an enlarged view of the substrate and the light collecting member attached to the attachment angle.

  As shown in FIG. 6, the condensing member 5 is formed on the side opposite to the facing surface 50 facing the LED 33 mounted on the substrate 32, and condenses the light emitted from the LED 33 only in the V direction. 52 is formed. The condensing unit 52 is arranged in three stages in the V direction and corresponds to each of the arrays of LEDs 33 arranged in the H direction, and condenses light emitted from the LEDs 33 arranged in each stage in the V direction. It has become. In addition, the shape of the condensing part 52 is not limited to a collimator lens shape, What is necessary is just an optical element which can condense in the V direction of LED32, for example, a cylindrical lens may be used.

  As shown in FIG. 6 and the like, a spacer 51 is formed on the facing surface 50 of the light collecting member 5 facing the substrate 32, and the light collecting member comes into contact with the substrate 32 by contacting the spacer 51. 5 is suppressed from contacting the LED 33. And the opposing surface 50 facing the board | substrate of the condensing member 5 is a rectangular shape, and the positioning boss | hub 53 which protrudes from the position away from the fixed direction in the H direction in the vicinity of the long side of the V direction lower side of the opposing surface 50 is provided. Is provided.

  A snap fit 54 that extends in the same direction as the pair of positioning bosses 53 is formed at the center of the long side on the upper side in the V direction of the facing surface 50. The positioning boss 53 is a member having the same shape, but the left positioning boss 531 is the left positioning boss 531 and the right positioning boss 532 is the right when viewed from the facing surface 50 side of the light collecting member 5. The two positioning bosses 53 and the snap fits 54 are formed in a triangular shape with the line connecting the two positioning bosses 53 as the base (so that the two positioning bosses 53 and the snap fits 54 are not in a straight line). Has been placed.

  As shown in FIG. 7, the substrate 32 is formed with through holes 321 and 322 through which the positioning boss 53 passes. The left positioning boss 531 is inserted into the right through hole 321 (first through hole), and the right positioning boss 532 is inserted into the left through hole 322 (second through hole).

  The right through hole 321 is a cylindrical through hole having an inner diameter that is substantially the same as the outer diameter of the positioning boss 53 and into which the left positioning boss 531 can be inserted without stress. Further, the right through-hole 321 is formed at a position where the left positioning boss 531 is inserted when the light collecting member 5 is disposed at an accurate position with respect to the substrate 32. The left through hole 322 has a long hole shape extending along a line connected to the right through hole 321, and has a width that allows the right positioning boss 532 to be inserted without stress.

  Thus, since the left through hole 322 has a long hole shape, the distance between the left positioning boss 531 and the right positioning boss 532 and the length between the right through hole 321 and the left through hole 322 are shifted. Even in this case, the left positioning boss 531 and the right positioning boss 532 can be inserted into the right through hole 321 and the left through hole 322, respectively. Since the left through-hole 322 extends along a line connecting the right through-hole 321, even if a force acts so that the light collecting member 5 rotates around the left positioning boss 531, Since the right positioning boss 532 receives a reaction force from the inner wall of the left through-hole 322, it does not rotate. Thereby, it is possible to position the board | substrate 32 and the condensing member 5 so that the precision of a relative position may become high easily.

  The flat plate portion 311 of the mounting angle 31 is also formed with a right through hole 3111 having the same shape as the right through hole 321 of the substrate 32 and a left through hole 3112 having the same shape as the left through hole 322. In a state where the substrate 32 and the light collecting member 5 are combined, a portion of the left positioning boss 531 protruding from the substrate 32 is a right through hole 3111 and a portion of the right positioning boss 532 protruding from the substrate 32 is a left through hole 3112. It is possible to easily and accurately position the substrate 32 and the light collecting member 5 with respect to the mounting angle 31.

  As shown in FIG. 6 and the like, the light condensing member 5 is formed with a snap fit 54. The snap fit 54 is not engaged with the substrate 32 and is formed on the flat plate portion 311 of the mounting angle 31. The condensing member 5 is suppressed from being pulled out by being inserted into the engaging hole 3110 (engagement portion) and engaging with the peripheral portion of the engagement hole 3110.

  More specifically, the opposing surface 50 of the light collecting member 5 is provided with a spacer 51, and the left positioning boss 531 is inserted into the right through hole 321 and the right positioning boss 532 is inserted into the left through hole 322. Thus, the substrate 32 and the spacer 51 come into contact with each other. At this time, the spacer 51 is in contact with the portion where the LED 33 is not mounted, and the contact between the LED 33 and the facing surface 50 is suppressed. Then, the left positioning boss 531 is inserted into the right through hole 3111, the right positioning boss 532 is inserted into the left through hole 3112, and the snap fit 54 and the engagement hole 3110 are engaged with each other, so The members 5 can be adjusted with respect to each other accurately and temporarily fixed at an accurate position with respect to the mounting angle 31.

  At this time, the left side positioning boss 531 and / or the right side positioning boss 532 are provided with the right through hole 3111 and / or the left through hole even when the light collecting member 5 rotates in the V direction around the snap fit 54. It is preferable that the length is such that it does not come off from 3112. By being formed in this way, even when vibration or impact is applied in a state where the substrate 32 and the light collecting member 5 are attached to the attachment angle 31 by the positioning boss 53 and the snap fit 54, the substrate 32 and the collector 32 are collected. The optical member 5 is prevented from being displaced from the mounting angle 31.

  The substrate 32 and the light collecting member 5 are temporarily fixed to the flat plate portion 311 with the positioning boss 53 and the snap fit 54, and then fixed to the flat plate portion 311 with two screws Sc. The screw Sc passes through the spacer 51 and is screwed into the flat plate portion 311. However, the screw Sc is not limited to this, and passes through a portion of the facing surface 50 different from the portion where the spacer 51 is formed. May be. Further, the light condensing member 5 is formed with a snap fit 54 at the center portion of the long side opposite to the long side to which the positioning boss 53 is close, but the invention is not limited to this. The above snap fit 54 may be formed. For example, in addition to the snap fit of the central portion of the long side described above, it may be formed in the central portion of the long side close to the positioning boss 53, or instead of the snap fit formed on the long side, One snap fit may be provided on each short side.

  Since the condensing member 5 and the substrate 32 having such a configuration are accurately positioned in advance by the positioning boss 53 and then temporarily fixed to the mounting angle 31 by the positioning boss 53 and the snap fit 54, for example, FIG. 1, even when the flat plate portion 311 is not horizontal, the mounting angle 31 can be easily and reliably fixed. Thereby, an attachment process can be simplified compared with the case where fixation of the board | substrate like the past and fixation of the condensing member 5 are performed by a separate process.

  Further, after temporarily fixing the substrate 32 and the light collecting member 5 to the mounting angle 31, the mounting angle 31 can be freely moved to some extent, so that the four mounting angles 31 shown in FIG. It is also possible to screw together after attaching the substrate 32 and the light collecting member 5 to the individual flat plate portions 311 in advance. Therefore, for example, the screwing process can be automated by a robot, and the manufacturing cost can be reduced.

  In addition, a reflection sheet is disposed on the surface of the substrate 32 on which the LED 33 is mounted with a through hole through which the positioning boss 53 passes, and the reflection sheet, the substrate 32, and the light collecting member 5 are simultaneously positioned and temporarily fixed. It is also possible to do. The member that is temporarily fixed at the same time as the substrate is not limited to the reflective sheet, but can be formed with a through-hole through which the positioning boss passes, and can be temporarily fixed by the locking force of the snap fit 54. Things can be held widely.

(Second Embodiment)
Another example of the lighting device according to the present invention will be described with reference to the drawings. FIG. 8 is a bottom view of a light collecting member and a substrate used in another example of the illumination device according to the present invention. The illuminating device shown in this embodiment has the same configuration as the illuminating device shown in FIG. 1 and the like except that the shapes of the light collecting member 5B and the substrate 32 are different, and substantially the same parts are denoted by the same reference numerals and are the same. Detailed description of the portion is omitted.

  As shown in FIG. 8, the substrate 32 is fixed to the flat plate portion 311 of the mounting angle 31 with a double-sided tape 34. The light condensing member 5B is formed with two snap fits 55 that protrude from both ends in the longitudinal direction, that is, from a portion far from the positioning boss 53 on the short side of the rectangular opposing surface 50, one by one. In addition, it is not limited to the double-sided tape 34, The adhesion | attachment method which can fix the board | substrate 32 to the flat plate part 311 of the angle 31 for attachment can be employ | adopted widely.

  The substrate 32 and the light collecting member 5B are positioned by the positioning bosses 531 and 532 and the through holes 321 and 322. Since the positioning of the substrate 32 and the light collecting member 5B is the same as described above, detailed description thereof is omitted. The substrate 32 and the condensing member 5B are mounted and fixed to the mounting angle 31 in a state where the substrate 32 and the light collecting member 5B are accurately positioned. At this time, the substrate 32 is fixed by the double-sided tape 34, and the light collecting member 5B inserts the positioning bosses 531 and 532 into the through holes 3111 and 3112 and engages the two snap fits 55 with the engagement holes 3110.

  As described above, the substrate 32 is firmly fixed by the double-sided tape 34 by mounting and fixing, and the light collecting member 5B can be fixed by the positioning bosses 531 and 532 and the two snap fits 55 so as not to be displaced. In the above configuration, since the screws are not used when the substrate 32 and the light collecting member 5B are attached to the attachment angle 31, the screwing step can be omitted. Further, since a light-transmitting low (or no) screw is omitted from the light condensing member, which is an optical member, the light emitted from the LED 33 can be used efficiently.

  In addition, since the heat | fever when LED33 light-emits can be efficiently discharge | released through the board | substrate 32 and the attachment angle 31 by using a thing with high heat conductivity for the double-sided tape 34, by the temperature rise of LED32, A reduction in luminance can be suppressed. In addition, when fixing the condensing member 5B to the mounting angle 31 only with the positioning boss 53 and the snap fit 55, the condensing member 5B may be formed of a material having a wide elastic region and being difficult to be brittlely broken. preferable.

  In each of the above-described embodiments, the lighting device is a so-called ceiling lamp of the type attached to the ceiling, but is not limited to the ceiling lamp as long as it includes a chassis having a reflecting portion, for example, The configuration of the lighting device of the present invention can also be used for hanging type lighting or the like.

(Third embodiment)
In each of the above-described embodiments, the light emitting unit 3 is attached to the central portion of the circular chassis 1. Although it is difficult with the circular chassis 1, it is also possible to arrange the light emitting part at the edge of the chassis by using a polygonal chassis. Accordingly, an illumination device in which a light emitting unit is arranged on the edge of the chassis will be described with reference to the drawings. FIG. 9 is an exploded perspective view of another example of a lighting device according to the present invention.

  As illustrated in FIG. 9, the lighting device B includes a rectangular chassis 6 and a cover 60 that covers the chassis 6. The chassis 6 is formed by cutting and bending a metal plate, and includes a rectangular flat plate portion 61 and side wall portions 62 formed by bending each side of the flat plate portion. As shown in FIG. 9, the light source unit including the substrate 32 on which the LED 33 is mounted and the light collecting member 5 are attached to the side wall portion 62 formed by bending the short side of the flat plate portion 61 of the chassis 6. .

  That is, in the lighting device B, a part of the side wall portion 62 functions as an attachment angle. Therefore, the mounting angle can be omitted. Further, the flat plate portion 61 of the chassis 6 is configured to efficiently reflect the light from the LED 33 toward the cover 60 side. Examples of the treatment of the flat plate portion 61 include well-known ones such as white coating and reflection sheet pasting.

  And the cover 60 of the side wall part 62 of the chassis 6 is attached and fixed. Since the cover 60 has the same configuration except that the shape of the cover 60 is different from that of the cover 4 of the illumination device A, the details are omitted. Although not shown, the drive control unit 2 is attached to the back surface of the flat plate portion 61. In the illuminating device B having such a configuration, the drive control unit 2, the mounting angle 3 and the like are not arranged in the central portion of the illuminating device, so that the non-light emitting portion can be reduced or eliminated, and the light is emitted from the illuminating device B. It is possible to reduce unevenness in the brightness of the emitted light.

  When the lighting device B is attached to the ceiling, a circular through-hole 610 as shown by a two-dot chain line is formed in the flat plate portion 61, and a connector arranged on the ceiling passes through the 610, and the flat plate portion 61. May be fixed. In addition, although it is set as the rectangular thing as the illuminating device B, it is not limited to this, For example, square shape may be sufficient, and polygonal shapes other than a square may be sufficient.

(Fourth embodiment)
Since the illuminating device of the present invention emits planar light from the light emitting surface, it can also be used as a backlight of a liquid crystal display device.

  Hereinafter, an example in which the illumination device of the present invention is used as a backlight of a liquid crystal display device will be described with reference to the drawings. FIG. 10 is an exploded perspective view showing an example of the liquid crystal display device according to the present invention.

  As shown in FIG. 10, the liquid crystal display device 8 includes a liquid crystal panel unit 81 and a backlight unit 82. In the liquid crystal display device 8, a liquid crystal panel unit 81 is arranged on the front side (observer side) of the backlight unit 82, and the liquid crystal panel unit 81 is placed on a metal bezel 83 having an opening window 830 in the center on the front side. It is being held down.

  The liquid crystal panel unit 81 includes a liquid crystal panel 811 in which liquid crystal is sealed, and a polarizing plate 812 attached to the front surface (observer side) and the back surface (backlight unit 1 side) of the liquid crystal panel 811. The liquid crystal panel 811 includes an array substrate 813, a counter substrate 814 disposed to face the array substrate 813, and liquid crystal filled between the array substrate and the counter substrate.

  The array substrate 813 is provided with a source wiring and a gate wiring orthogonal to each other, a switching element (for example, a thin film transistor) connected to the source wiring and the gate wiring, a pixel electrode connected to the switching element, an alignment film, and the like. The counter substrate 814 is provided with a color filter in which colored portions of red, green, and blue (RGB) are arranged in a predetermined arrangement, a common electrode, an alignment film, and the like.

  In the liquid crystal panel unit 81, a voltage is applied between the array substrate 813 and the counter substrate 814 in each pixel of the liquid crystal panel 811 by driving the switching element. When the voltage between the array substrate 813 and the counter substrate 814 changes, the liquid crystal in each pixel rotates and light is modulated (the degree of light transmission is changed). As a result, an image is displayed in the image display area on the viewer side of the liquid crystal panel 811.

  The bezel 83 is a metal frame and has a shape that covers the edge portion of the front surface of the liquid crystal panel unit 81. The bezel 83 includes a rectangular opening window 830 formed so as not to hide the image display area of the liquid crystal panel unit 81, a pressing portion 831 that presses the liquid crystal panel unit 81 from the front side, and a rear surface from the edge of the pressing portion 831. And a cover portion 832 that covers the edges of the liquid crystal panel unit 81 and the backlight unit 82. The bezel 83 is grounded and shields the liquid crystal panel unit 81 and the backlight unit 82.

  The backlight unit 82 is an illumination device that irradiates the liquid crystal panel unit 81 with planar light. The backlight unit 82 has a structure equivalent to that of the lighting device shown in the first embodiment. That is, the backlight chassis 821 having a rectangular bottom corresponding to the chassis 1 and the light source unit 823 corresponding to the light emitting unit 3 are provided. Since the backlight unit 82 is a member having a rectangular bottom surface, the light source unit 823 is disposed on both short sides. And although illustration is abbreviate | omitted, the control circuit part is attached and arrange | positioned at the surface of the back side of a bottom face. An optical sheet member 822 for diffusing outgoing light and increasing luminance is disposed on the light outgoing surface side of the backlight unit 82.

  The structure of the light source unit 823 has substantially the same structure as that of the light emitting unit 3 except that the substrate is arranged in a straight line. That is, a plurality of substrates 32 and light collecting members 5 on which the LEDs 33 shown in FIG. 4 are mounted are attached to the short side. In the backlight unit 82, since the light source unit 823 is attached to the outer peripheral portion of the backlight chassis 821, the side wall portions that are raised from the sides of the rectangular bottom surface are formed to form the attachment angle. Can be used as

  Such a backlight unit 82 can emit planar light with less luminance unevenness than the light emitting surface facing the bottom without using a light guide plate, and the number of components can be reduced accordingly. is there.

  The liquid crystal display device shown in the present embodiment can be employed in, for example, a mobile phone, a tablet PC, a display device for home appliances, a television receiver, and the like.

  In each of the above-described embodiments, a ceiling lamp or a backlight of a liquid crystal display device is given as the illumination device. However, in addition to these, it can also be used as a back-side illumination device that illuminates from the back of an electric signboard or the like. Is possible.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

  The illuminating device according to the present invention emits light with less unevenness in luminance, and is therefore attached to the ceiling of a living room or the like, and can be used as a backlight for a lighting fixture or a liquid crystal display device that irradiates the entire light.

DESCRIPTION OF SYMBOLS 1 Chassis 2 Drive control part 20 Insulation sheet 21 Circuit board 22 Support part 23 Support part 3 Light emission part 31 Mounting angle 311 Flat plate part 312 Fixing part 313 Holding part 32 Board | substrate 33 LED
4 Cover 5 Condensing member 50 Opposing surface 51 Spacer 52 Condensing part (collimator lens)

Claims (10)

A housing having a reflecting portion facing the light emitting surface;
A substrate on which LEDs are arranged and mounted;
A light collecting member arranged to face the surface of the substrate on which the LED is mounted,
The light condensing member includes two positioning bosses protruding from the facing surface facing the substrate, and a snap fit protruding from a position away from the positioning boss,
The substrate has a cylindrical first through hole having the same inner diameter as the outer diameter of the positioning boss, and an elongated second through hole extending along a line connected to the first through hole,
Inserting the tip portions protruding from the first through hole and the second through hole of the positioning boss into the through holes formed in the housing, and engaging the snap fit with the engaging portions formed in the housing Thus, the substrate and the light condensing member are attached to the housing so that the light from the LED follows the reflecting portion.   2. The lighting device according to claim 1, wherein the positioning boss is formed with a length that does not come out of a through hole of the housing when the substrate is rotated about the snap fit so as to be separated from the housing.   The lighting device according to claim 1, wherein the light collecting member and the substrate are fixed to the housing by screwing together.   The illumination according to claim 1, wherein two or more snap fits are formed on the facing surface, and the light collecting member and the substrate are fixed by the positioning boss and the snap fit. apparatus.   The lighting device according to claim 4, wherein the substrate is fixed to the housing by an adhesive unit.   The board | substrate with which the said LED was mounted, and the said condensing member are attached to the outer surface side of the attachment part formed in the polygonal cylindrical shape arrange | positioned in the center part of the said housing | casing. The lighting device according to any one of 5.   The said housing | casing has a rectangular flat plate part, The said board | substrate and the said condensing member are attached to the wall body which protruded from the at least one side of the said flat plate part. Lighting equipment.   The backlight using the illuminating device of Claim 7.   A liquid crystal display device comprising the backlight according to claim 8.   A television receiver comprising the liquid crystal display device according to claim 9.

Images