JP2012142098A - Light source module, and surface light source device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source module capable of performing illumination to an illuminated object uniformly without unevenness.SOLUTION: The light source module includes a light source board 1 and an optical element 2 having at least a lighting curtain 21. Then, the optical element 2 has top surface parts 21 which are arranged opposite at a prescribed interval to a mounting surface 1a of the light source board 1, a bottom part 22 which is arranged so as to face the mounting surface 1a of the light source board 1, and side parts 23 which mutually connect the top surface parts 21 and the bottom part 22. The top surface parts 21 are made as the lighting curtain 21 and the bottom part 22 is installed and fixed to the light source board 1.

Description

  The present invention relates to a light source module and a surface light source device including the same.

  2. Description of the Related Art Conventionally, a surface light source device that generates planar illumination light to illuminate an object to be illuminated is known, and is used as a backlight unit installed in a liquid crystal display device (see, for example, Patent Document 1). .

  Conventionally, CCFL (cold cathode fluorescent lamp) in which mercury or xenon is enclosed in a fluorescent tube has been mainly used as a light source of a surface light source device. However, when the CCFL is used as the light source of the surface light source device, there are inconveniences that the light emission luminance and the life are insufficient, and that the light emission on the low pressure side is low, so that it is difficult to obtain a uniform light emission. Therefore, in order to eliminate such inconvenience, various surface light source devices using an LED (light emitting diode) package as a light source instead of the CCFL have been conventionally proposed.

  Hereinafter, an example of the configuration of a conventionally proposed surface light source device will be briefly described with reference to FIG.

  In the conventional proposed surface light source device, as shown in FIG. 19, a light source substrate 102 is accommodated in a chassis 101 having an opening for light emission. The light source substrate 102 has an LED package 103 as a light source mounted on its mounting surface.

  Further, a reflection sheet 104 that reflects light is also accommodated inside the chassis 101. The reflection sheet 104 is disposed so as to face the mounting surface of the light source substrate 102 and covers the mounting surface of the light source substrate 102. The reflective sheet 104 has an exposed hole. When the reflective sheet 104 is arranged so as to face the mounting surface of the light source substrate 102, the LED package 103 is exposed from the exposed hole of the reflective sheet 104 ( Protruding).

  A lighting curtain 105 is attached to the opening of the chassis 101, and the opening of the chassis 101 is blocked by the lighting curtain 105. On the predetermined surface of the lighting curtain 105 (the surface opposite to the surface facing the mounting surface of the light source substrate 102), a diffusion plate 106 that diffuses light is disposed without any gap.

  By the way, the light source overlapping portion (the portion where the amount of incident light is large) that overlaps the LED package 103 of the lighting curtain 105 is subjected to a process that reduces the amount of transmitted light. On the other hand, in the lighting curtain 105, a portion other than the light source superimposed portion (a portion where the amount of incident light is small) is subjected to processing that increases the amount of transmitted light. For this reason, when the light generated by the LED package 103 enters the lighting curtain 105, the light is emitted in a planar shape from a predetermined surface of the lighting curtain 105, but luminance unevenness hardly occurs in the light. Then, the light emitted from the predetermined surface of the lighting curtain 105 is diffused by the diffusion plate 106 and then illuminates the object to be illuminated as illumination light.

Japanese Patent Application Laid-Open No. 64-72193

  When the LED package is used as the light source of the surface light source device, the LED package as the light source has a higher directivity than the CCFL. Therefore, in order to maximize the effects obtained by providing the lighting curtain, The alignment between the lighting curtain, that is, the alignment between the light source substrate and the lighting curtain must be performed more strictly.

  However, in the conventional proposed surface light source device shown in FIG. 19, the attachment of the light source substrate 102 to the chassis 101 and the attachment of the lighting curtain 105 to the chassis 101 are performed separately. Therefore, the positional deviation is likely to occur between the light source substrate 102 (LED package 103) and the lighting curtain 103, and the effect obtained by providing the lighting curtain 105 may be reduced. That is, in the conventionally proposed surface light source device, although the lighting curtain 105 is provided, luminance unevenness may occur in the illumination light. In this case, it becomes difficult to uniformly and uniformly illuminate the object to be illuminated.

  As a method for avoiding the positional deviation between the light source substrate 102 and the lighting curtain 105, it is conceivable to provide a positioning mechanism for accurately attaching the light source substrate 102 and the lighting curtain 105 in the chassis 101 or the like. However, if this is done, the inconvenience that the mounting of the light source board 102 and the lighting curtain 105 to the respective chassis 101 becomes complicated and the cost increases as much as the positioning mechanism is provided occurs. Furthermore, since the attaching process of the light source substrate 102 and the lighting curtain 105 to the chassis 101 is a separate process, the cost of the attaching process increases and the throughput of the attaching process decreases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a light source module capable of uniformly and uniformly illuminating an object to be illuminated, and a surface light source device including the same. .

  In order to achieve the above object, a light source module according to a first aspect of the present invention includes a light source, a mounting surface, a light source substrate on which the light source is mounted, and light from the light source partially. And an optical member having at least a lighting curtain. The optical member includes a top surface portion disposed opposite to the mounting surface of the light source substrate with a predetermined interval, a bottom portion disposed so as to face the mounting surface of the light source substrate, and the top surface portion and the bottom portion. And a top surface portion of the optical member as a lighting curtain, and a bottom portion of the optical member is fixedly attached to the light source substrate.

  In the light source module according to the first aspect, as described above, the optical member is disposed so as to face the mounting surface of the light source substrate and the top surface portion arranged to face the mounting surface of the light source substrate with a predetermined interval. And the top surface of the optical member is attached to and fixed to the light source substrate, and the lighting curtain is attached to the light source substrate. It becomes an integrated state. Thereby, when attaching a light source board | substrate and a lighting curtain to a some housing | casing, it becomes unnecessary to attach to a housing | casing of a light source substrate and a lighting curtain separately. Therefore, it is possible to suppress the inconvenience that the positional deviation occurs between the light source substrate and the lighting curtain due to the separate attachment of the light source substrate and the lighting curtain to the housing. That is, luminance unevenness hardly occurs in light (illumination light) emitted through the lighting curtain. As a result, it becomes possible to uniformly illuminate the object to be illuminated.

  In the light source module according to the first aspect, when the light source module is attached to any housing, it is not necessary to separately provide a positioning mechanism for accurately attaching the light source substrate and the lighting curtain to the housing. The curtain can be easily attached to the casing, and the cost of parts can be reduced. Furthermore, since the lighting curtain is integrated with the light source substrate, the attaching process of the light source substrate and the lighting curtain to the housing is the same process. Therefore, the cost of the attachment process is reduced and the throughput of the attachment process is improved.

  In the light source module according to the first aspect, an exposure hole is formed in the bottom of the optical member, and the bottom of the optical member is attached and fixed to the light source substrate in a state where the light source is exposed from the exposure hole in the bottom of the optical member. It is preferable. If comprised in this way, even if it attaches and fixes the bottom part of an optical member to a light source board | substrate, it can suppress that the light emission of a light source is inhibited by the bottom part of an optical member.

  In the light source module according to the first aspect, it is preferable that the bottom portion of the optical member is a reflection portion that reflects light. With this configuration, since light is reflected on the mounting surface of the light source substrate, light loss toward the mounting surface of the light source substrate is suppressed, so that the loss of light is reduced and light utilization efficiency is improved. To do. Furthermore, if light is reflected on the mounting surface of the light source substrate, light directed toward the mounting surface of the light source substrate can be reflected toward the top surface portion (lighting curtain) of the optical member. The light (illumination light) emitted through the lighting curtain increases and the brightness increases.

  In the light source module according to the first aspect, the bottom portion and the side portion of the optical member may be formed integrally, and further, the top surface portion of the optical member is formed integrally with the bottom portion and the side portion of the optical member. It may be. If comprised in this way, the optical member which has a top | upper surface part (lighting curtain), a bottom part, and a side part integrally can be obtained easily.

  In the light source module according to the first aspect, the side portion of the optical member may be a reflecting portion that reflects light, or the side portion of the optical member has a total light transmittance of 50% or more; It may be.

  If the side portion of the optical member is a reflecting portion that reflects light, the absorption of light toward the side portion of the optical member is suppressed, so that the loss of light is reduced and the light utilization efficiency is improved. Furthermore, since the light which goes to the side part of an optical member can be reflected toward the top | upper surface part (lighting curtain) of an optical member, the light (illumination light) radiate | emitted through a lighting curtain increases and a brightness | luminance improves.

  Further, if the side portion of the optical member is a light transmitting portion having a total light transmittance of 50% or more, for example, when two optical members are used adjacent to each other, they are covered with one optical member. A part of light from each of the light source and the light source covered by the other optical member is mixed with each other until it enters the top surface portion (lighting curtain) of the optical member. Therefore, even if there is a variation in luminance and chromaticity between the light source covered by one optical member and the light source covered by the other optical member, the variation in luminance and chromaticity is alleviated to some extent, Variation in chromaticity is not noticeable.

  In the light source module according to the first aspect, the bottom of the optical member and the light source substrate may be bonded to each other via an adhesive material, whereby the bottom of the optical member may be attached and fixed to the light source substrate. If comprised in this way, the bottom part of an optical member can be easily attached and fixed to a light source board | substrate. In addition, since it is not necessary to provide any attachment portion on the light source substrate and the optical member, the structure of the light source substrate and the optical member is simplified.

  In the light source module according to the first aspect, fitting portions are provided on the bottom portion of the optical member and the light source substrate, respectively, and the fitting portions of the bottom portion of the optical member and the light source substrate are fitted to each other. Accordingly, the bottom of the optical member may be attached and fixed to the light source substrate. If comprised in this way, the bottom part of an optical member can be easily attached and fixed to a light source board | substrate. In addition, there is no need to separately prepare any member for attaching and fixing the bottom of the optical member to the light source substrate, so that the number of components does not increase.

  In the light source module according to the first aspect, the predetermined portion of the optical member may protrude outward from the outer edge of the light source substrate when seen in a plan view from the region facing the mounting surface of the light source substrate. In this way, the size of the light source board is possible if the predetermined portion of the optical member may protrude outward from the outer edge of the light source board when viewed in plan from the region facing the mounting surface of the light source board. It can be as small as possible. Therefore, the cost for the light source substrate is reduced.

  In this case, it is preferable that product information is displayed on a predetermined portion of the optical member. If comprised in this way, the following effects will be acquired.

  That is, when product information is displayed on the mounting surface of the light source substrate as usual, the product information is hidden behind the optical member. Therefore, the product information cannot be identified unless the optical member is removed from the light source substrate. If product information is displayed in a predetermined part of the product information, the product information can be easily identified. Furthermore, since it is not necessary to provide a space for displaying product information in the light source substrate, the size of the light source substrate can be reduced correspondingly, and the cost for the light source substrate can be reduced.

  In the light source module according to the first aspect, the light source is preferably a light emitting diode.

  A surface light source device according to a second aspect of the present invention includes the light source module according to the first aspect. In the surface light source device configured as described above, it is possible to uniformly illuminate the object to be illuminated, and the productivity is also improved.

  In the surface light source device according to the second aspect, the light source module includes a plurality of light source modules, and surrounds a light emitting body composed of the plurality of light source modules when viewed in a plan view from a region facing the mounting surface of the light source substrate. Thus, it is preferable that a reflection sheet for reflecting light is disposed. With this configuration, when viewed in plan, light is reflected near the outer periphery of the light emitter (an assembly of a plurality of light source modules). Secured. Therefore, even if the outer peripheral part of the illuminated body protrudes from the light emitter in plan view, the illumination light that illuminates the outer circumferential part of the illuminated object can be suppressed from becoming dark.

  Furthermore, in this configuration, even if there is a slight change in the size of the object to be illuminated, it is only necessary to change the size of the reflection sheet, or to adjust the number and position of the light source modules. Can respond to body size changes. Therefore, it is not necessary to redesign the light source module, and the labor required for changing the size of the illuminated object is greatly reduced.

  As described above, according to the present invention, it is possible to easily obtain a light source module that can uniformly illuminate an object to be illuminated and a surface light source device including the light source module.

1 is a perspective view of a light source module according to a first embodiment of the present invention. It is a top view of the light source module by 1st Embodiment shown in FIG. It is sectional drawing of the light source module by 1st Embodiment shown in FIG. It is a top view of the light source board | substrate contained in the light source module by 1st Embodiment shown in FIG. It is sectional drawing of the light source board | substrate shown in FIG. It is a top view at the time of seeing the optical member contained in the light source module by 1st Embodiment shown in FIG. 1 from the bottom part side. It is sectional drawing which expanded a part of light source module by 1st Embodiment shown in FIG. 1 (The figure for demonstrating the 1st example of the attachment method of the optical member with respect to a light source board | substrate). It is sectional drawing (the figure for demonstrating the 2nd example of the attachment method of the optical member with respect to a light source board | substrate) which expanded a part of light source module by 1st Embodiment shown in FIG. FIG. 5 is an enlarged cross-sectional view of a part of the light source module according to the first embodiment shown in FIG. 1 (a diagram for explaining a third example of a method for attaching an optical member to a light source substrate). It is a top view at the time of seeing the light source module by 1st Embodiment shown in FIG. 1 from the side part side (The figure for demonstrating an example of the display location of product information). It is a top view at the time of seeing the light source module by 1st Embodiment shown in FIG. 1 from the side part side (The figure for demonstrating the other example of the display location of product information). It is a figure for demonstrating the manufacturing method of the optical member contained in the light source module by 1st Embodiment shown in FIG. It is a top view at the time of seeing the optical member manufactured using the manufacturing method shown in FIG. 12 from the bottom side. It is a top view of the light source module by 2nd Embodiment of this invention. It is sectional drawing of the light source module by 2nd Embodiment shown in FIG. It is sectional drawing of the surface light source device by 3rd Embodiment of this invention. FIG. 17 is a perspective view of a light emitter (an assembly made up of a plurality of light source modules) included in the surface light source device according to the third embodiment shown in FIG. 16. It is a top view inside the surface light source device by 3rd Embodiment shown in FIG. It is sectional drawing which showed an example of the structure of the conventional surface light source device proposed.

(First embodiment)
The configuration of the light source module MJ1 according to the first embodiment of the present invention will be described with reference to FIGS.

  The light source module MJ1 according to the first embodiment includes a light source substrate (printed wiring board) 1 and an optical member 2 as shown in FIGS.

  As shown in FIGS. 4 and 5, the light source substrate 1 has a mounting surface 1a, and the LED package 11 is mounted on the mounting surface 1a. The LED package 11 is an example of the “light source” in the present invention.

  The number of LED packages 11 mounted on the light source substrate 1 is plural (for example, four), and the plurality of LED packages 11 are modularized by being mounted on the same light source substrate 1. The number of LED packages 11 mounted on the light source substrate 1 is not particularly limited, and can be changed according to the application.

  For such a light source substrate 1, for example, a hard insulating resin plate is used as a base material. In addition, as a wiring structure of the light source substrate 1, a wiring layer may be provided only on one side of the base material, or a wiring layer may be provided on both sides of the base material. Of course, three or more wiring layers may be laminated.

  In addition, the light source substrate 1 is formed so that the outer shape thereof is an elongated rectangular shape (strip shape) when viewed in a plan view from the region facing the mounting surface 1a (hereinafter simply referred to as a plan view). Has been. The plurality of LED packages 11 mounted on the light source substrate 1 are arranged in a row at predetermined intervals (equal intervals) along the longitudinal direction of the light source substrate 1. In the following description, the longitudinal direction of the light source substrate 1 (the direction along the long side of the mounting surface 1a) is referred to as the X direction, and the short side direction of the light source substrate 1 (the direction along the short side of the mounting surface 1a). ) Is called the Y direction.

  The LED package 11 is a top view type. Many LED packages of this type have directivity in the direct upward direction for light emission, and the light distribution characteristics of the LED package 11 will be described based on this. That is, in a state where the LED package 11 is mounted on the light source substrate 1, the direction in which the center of the light emitting surface of the LED package 11 faces the mounting surface 1 a of the light source substrate 1 (the normal direction of the mounting surface 1 a of the light source substrate 1). Directed in the same direction. Accordingly, when viewed in plan without the lighting curtain 21 described later, the light amount in the region overlapping with the LED package 11 is the largest, and the light amount gradually decreases as the distance from the region overlapping with the LED package 11 increases radially. In addition, the mounting surface 1a of the light source substrate 1 is directed to the illuminated body side. Accordingly, the central portion of the light emitting surface of the LED package 11 mounted on the mounting surface 1a of the light source substrate 1 is also directed toward the illuminated body.

  Further, the LED package 11 has a structure in which white light is emitted from the light emitting surface. The structure of the LED package 11 is not particularly limited. For example, a phosphor that converts blue light into yellow and a blue LED element are combined. Or you may combine the fluorescent substance and blue LED element which each convert blue light into green and red, and may combine three types of LED elements, a red LED element, a green LED element, and a blue LED element.

  In addition to the LED package 11, a connector 12 is mounted on the light source substrate 1. The connector 12 is for electrically connecting the LED package 11 to an external device, and is disposed at one end portion of the light source substrate 1 in the X direction.

  Returning to FIGS. 1 to 3, the optical member 2 that forms the light source module MJ <b> 1 together with the light source substrate 1 has at least a lighting curtain 21 that partially blocks light from the LED package 11.

  The lighting curtain 21 is made of a plate-like reflector, and is disposed on the mounting surface 1a side of the mounting surface 1a and the back surface (the surface opposite to the mounting surface 1a) of the light source substrate 1, and the light source substrate 1 facing the mounting surface 1a with a predetermined interval. Since the mounting surface 1a of the light source substrate 1 is a surface directed toward the body to be illuminated, when the lighting curtain 21 is disposed to face the mounting surface 1a of the light source substrate 1, a predetermined surface (light source substrate) of the lighting curtain 21 is provided. 1 opposite to the surface facing the mounting surface 1a) is directed to the illuminated side.

  And in planar view, parts other than the one end part of the X direction of the light source substrate 1 are covered with the lighting curtain 21. Therefore, the LED package 11 is covered with the lighting curtain 21. Accordingly, when light is emitted from the LED package 11, the light is incident on the lighting curtain 21.

  Note that the portion other than the one end portion in the X direction of the light source substrate 1 is covered with the lighting curtain 21. That is, the one end portion in the X direction of the light source substrate 1 is not covered with the lighting curtain 21. It is. For this reason, the connector 12 located at one end portion in the X direction of the light source substrate 1 is exposed without being covered by the lighting curtain 21.

  Further, the lighting curtain 21 has a rectangular shape (rectangular shape) whose outer shape in plan view is long in the X direction. A plurality of LED packages 11 mounted on the light source substrate 1 are collectively covered by one lighting curtain 21.

  Further, the lighting curtain 21 has an opening 21a for transmitting light. For this reason, of the light emitted from the LED package 11, the light incident on the portion other than the opening 21 a of the lighting curtain 21 is reflected by the lighting curtain 21 and travels toward the light source substrate 1. On the other hand, the light incident on the opening 21a of the lighting curtain 21 passes through the lighting curtain 21 as it is, and passes from a predetermined surface of the lighting curtain 21 (the surface opposite to the surface facing the mounting surface 1a of the light source substrate 1) toward the object to be illuminated. It is emitted toward. That is, in the light source module MJ1, a predetermined surface of the lighting curtain 21 is a light emission surface.

  The opening shape of the opening 21a of the lighting curtain 21 is not particularly limited, and may be a circular shape or a shape different from the circular shape (for example, an elliptical shape or a polygonal shape). Also good.

  A plurality of openings 21a are formed in the lighting curtain 21, and they are dispersedly arranged so as not to be connected to each other. Furthermore, the size (opening area) of the plurality of openings 21a of the lighting curtain 21 is not uniform and varies depending on the arrangement position.

  Specifically, when a portion of the lighting curtain 21 that overlaps the LED package 11 in a plan view (a portion surrounded by a broken line in FIG. 2) is defined as the overlapping portion 21b, as the distance from the overlapping portion 21b increases radially, Each size of the plurality of openings 21a is set so that the aperture ratio gradually increases. In other words, the size of each of the plurality of openings 21a of the lighting curtain 21 gradually increases as the distance from the overlapping portion 21b increases radially. As a modification, the plurality of openings 21a of the lighting curtain 21 have the same size, and the distance between the adjacent openings 21a is gradually narrowed away from the overlapping portion 21b in a radial manner. Is also possible.

  Accordingly, when light is emitted from the LED package 11, a lot of light is incident on the overlapping portion 21 b of the lighting curtain 21, but light that is reflected toward the light source substrate 1 without passing through the lighting curtain 21. Will also increase. On the other hand, in the portions other than the overlapping portion 21b of the lighting curtain 21, the incident light decreases as the distance from the overlapping portion 21b increases radially, but the light that passes through the lighting curtain 21 (light that passes through the opening 21a) overlaps. It gradually increases as the distance from 21b increases. That is, the difference between the amount of light emitted from the overlapping portion 21b of the lighting curtain 21 (and the vicinity of the overlapping portion 21b) and the amount of light emitted from the portion separated from the overlapping portion 21b of the lighting curtain 21 is reduced. . For this reason, luminance unevenness hardly occurs in the emitted light from the predetermined surface (light emitting surface) of the lighting curtain 21, and the effect that the illuminated object can be favorably illuminated is obtained.

  Needless to say, if the light reflection in the portion other than the opening 21a (the portion including the overlapping portion 21b) of the lighting curtain 21 is small (the light absorption is large), even if the occurrence of luminance unevenness is suppressed, the luminance itself. Becomes lower. Therefore, it is preferable to use a material having a high light reflectance as a constituent material of the lighting curtain 21, thereby suppressing a decrease in luminance as much as possible. As such a material, there is a microfoamed PET (polyethylene terephthalate) resin and the like, for example, is sold by Furukawa Electric under the trade name “MCPET”. Note that “MCPET” manufactured by Furukawa Electric Co., Ltd. has a very high light reflectance of 99% and is suitable as a constituent material of the lighting curtain 21.

  Here, in the case where luminance unevenness is suppressed using the lighting curtain 21, the lighting curtain 21 is provided when the overlapping portion (the portion with a low aperture ratio) 21 b of the lighting curtain 21 is displaced from the LED package 11 in plan view. The effect obtained with is reduced. For this reason, it is very important to match the LED package 11 and the overlapping portion 21b of the lighting curtain 21 in plan view.

  Therefore, in the first embodiment, instead of attaching and fixing the optical member (a member having at least the lighting curtain 21) 2 to another member such as a housing, a part of the optical member 2 is directly attached to the light source substrate 1. By fixing, the positional deviation in plan view of the overlapping portion 21b of the lighting curtain 21 with respect to the LED package 11 is suppressed. That is, the optical member 2 has a structure that can be attached to the light source substrate 1.

  As the structure of the optical member 2, the optical member 2 is integrally formed with the top surface portion 21, the bottom portion 22, and the side portion 23. The top surface portion 21 is a plate-like portion that is disposed to be opposed to the mounting surface 1a of the light source substrate 1 at a predetermined interval, and has an elongated rectangular shape (rectangular shape) whose outer shape in plan view is long in the X direction. Is formed. The bottom portion 22 is a plate-like portion that is disposed so as to face the mounting surface 1a of the light source substrate 1 (disposed facing the top surface portion 21 with a predetermined interval), and has an outer shape in plan view. It is formed in an elongated rectangular shape that is long in the X direction (the same shape as the outer shape of the top surface portion 21). The side portion 23 is a plate-like portion erected on the outer periphery of the top surface portion 21 (bottom portion 22), and connects the outer periphery of the top surface portion 21 and the bottom portion 22 to each other. From this, it can be said that the optical member 2 is formed in a box shape having a cavity inside (a portion surrounded by the top surface portion 21, the bottom portion 22 and the side portion 23).

  Of these portions (the top surface portion 21, the bottom portion 22, and the side portions 23) of the optical member 2, the top surface portion 21 is a lighting curtain 21, and the bottom portion 22 is a portion that is attached to the light source substrate 1. . That is, the lighting curtain 21 (the top surface portion 21 of the optical member 2) is fixed to the light source substrate 1 by attaching the bottom portion 22 of the optical member 2 to the light source substrate 1.

  Further, the same number of exposed holes 22a having a square opening as the number of LED packages 11 mounted are formed in the bottom portion 22 of the optical member 2. The LED packages 11 are exposed (projected) one by one from the exposed holes 22a of the bottom 22 of the optical member 2. The opening shape of the exposure hole 22a in the bottom portion 22 of the optical member 2 is not particularly limited as long as the LED package 11 can be exposed (projected). In addition, when the optical member 2 is viewed in plan from the bottom 22 side, it is as shown in FIG.

  For example, as shown in FIG. 7, the adhesive member 24 is disposed between the light source substrate 1 and the bottom portion 22 of the optical member 2, and the adhesive member 24 is attached to the light source substrate 1. The light source substrate 1 and the bottom 22 of the optical member 2 are bonded to each other. The adhesive material 24 may be a cured liquid adhesive or a double-sided tape.

  Further, as shown in FIG. 8, the light source substrate 1 is provided with a fitting hole 1 b and the optical member 2 is provided with a fitting protrusion 22 b at the bottom 22, and the light source substrate 1 is fitted with the fitting hole 1 b in the bottom 22 of the optical member 2. The bottom 22 of the optical member 2 may be attached and fixed to the light source substrate 1 by fitting the fitting protrusions 22b. The fitting hole 1b and the fitting protrusion 22b are examples of the “fitting portion” in the present invention.

  Alternatively, as shown in FIG. 9, the light source substrate 1 is provided with a fitting protrusion 1 c and the optical member 2 is provided with a fitting hole 22 c at the bottom 22, and the light source substrate 1 is fitted with the fitting protrusion 1 c on the bottom 22 of the optical member 2. The bottom portion 22 of the optical member 2 may be attached and fixed to the light source substrate 1 by fitting into the fitting hole 22c. The fitting protrusion 1c and the fitting hole 22c are examples of the “fitting portion” in the present invention.

  Of course, the bottom 22 of the optical member 2 may be attached and fixed to the light source substrate 1 using a method different from the method shown in FIGS. In any case, as shown in FIGS. 1 to 3, the top surface portion (lighting curtain) 21 of the optical member 2 is disposed facing the mounting surface 1 a of the light source substrate 1 at a predetermined interval. It is sufficient that the bottom portion 22 of the optical member 2 is securely attached to the light source substrate 1.

  Further, when viewed in plan with the bottom portion 22 of the optical member 2 attached and fixed to the light source substrate 1, a predetermined portion of the optical member 2 projects outward from the outer edge of the light source substrate 1. That is, the width in the Y direction in the plan view of the light source substrate 1 is smaller than the width in the Y direction in the plan view of the optical member 2 (the width in the Y direction in the plan view of the top surface portion 21 and the bottom portion 22).

  In this embodiment, distribution management, quality maintenance, and the like are performed on a predetermined portion of the optical member 2 (a portion protruding outward from the outer edge of the light source substrate 1 in plan view) instead of the mounting surface 1a of the light source substrate 1. An identification label 25 (see FIG. 10 and FIG. 11) representing product information is attached. The identification label 25 is a label printed with a serial number or a barcode obtained by encoding the serial number.

  As a specific sticking place of the identification label 25, as shown in FIG. 10, the side part 23 of the optical member 2 may be sufficient, and even if it is the bottom part 22 of the optical member 2 as shown in FIG. Good. Instead of attaching the identification label 25 to a predetermined portion of the optical member 2, product information may be directly printed on the predetermined portion of the optical member 2 by using a method such as a laser printing method. Product information may be stamped on a predetermined portion.

  By the way, the top | upper surface part (lighting curtain) 21, the bottom part 22, and the side part 23 of the optical member 2 shown in FIGS. 1-3 are integrally shape | molded with the same material. That is, although it has already been described that the top surface portion (lighting curtain) 21 of the optical member 2 is made of a reflective material (fine foamed PET resin), the bottom portion 22 and the side portion 23 of the optical member 2 are also reflective material (finely foamed PET). Resin). Therefore, it can be said that each of the bottom part 22 and the side part 23 of the optical member 2 is a reflection part that reflects light.

  Such an optical member 2 is produced by the following method, for example.

  As a procedure for producing the optical member 2, first, a sheet made of a microfoamed PET resin is prepared, and the sheet 20 as shown in FIG. 12 is produced by performing press working (punching) on the sheet.

  This sheet | seat 20 is corresponded to what developed the optical member 2 shown in FIGS. That is, the portion 201 of the sheet 20 corresponds to the top surface portion (lighting curtain) 21 of the optical member 2, and the opening 201 a formed in the portion 201 of the sheet 20 is the opening portion of the top surface portion (lighting curtain) 21 of the optical member 2. This corresponds to 21a. Further, the portion 202 of the sheet 20 corresponds to the bottom portion 22 of the optical member 2, and the notch 202 a formed in the portion 202 of the sheet 20 corresponds to the exposure hole 22 a of the bottom portion 22 of the optical member 2. Further, the portion 203 of the sheet 20 corresponds to the side portion 23 of the optical member 2. In addition, the broken line in FIG. 12 is a fold line obtained by performing a perforation process etc., for example, it can process simultaneously with a press process (punching process).

  Then, after the pressing process (punching process), when the fixing method shown in FIG. 7 is adopted, the adhesive material 24 is printed and applied to the portion 202 of the sheet 20.

  Subsequently, along the fold line (broken line in FIG. 12), the portion 203 is bent at a right angle with respect to the portion 201 of the sheet 20, and further, the portion 202 is bent at a right angle with respect to the portion 203 of the sheet member 20. Thereby, the optical member 2 as shown in FIGS. 1 to 3, that is, the optical member 2 in which the top surface portion (lighting curtain) 21, the bottom portion 22 and the side portion 23 are integrated with each other is obtained.

  In this manufacturing method, as shown in FIG. 13, a seam (thick line in FIG. 13) enters the bottom 22 of the optical member 2. Further, a combination of the notches 202 a (see FIG. 12) formed in the portion 202 of the sheet 20 becomes the exposed hole 22 a of the bottom portion 22 of the optical member 2.

  In the first embodiment, as described above, the optical member faces the mounting surface 1a of the light source substrate 1 and the top surface portion 21 disposed to face the mounting surface 1a of the light source substrate 1 with a predetermined interval. The top surface portion 21 of the optical member 2 is attached to the light source substrate 1 by causing the top surface portion 21 of the optical member 2 to function as the lighting curtain 21. By fixing, the lighting curtain 21 is integrated with the light source substrate 1. Thereby, when attaching the light source board | substrate 1 and the lighting curtain 21 to a certain housing | casing, it becomes unnecessary to attach to the housing | casing of the light source substrate 1 and the lighting curtain 21 separately. Therefore, the occurrence of inconvenience that a positional shift occurs between the light source substrate 1 and the lighting curtain 21 due to separately attaching the light source substrate 1 and the lighting curtain 21 to the housing is suppressed. That is, unevenness in luminance is less likely to occur in light (illumination light) emitted through the lighting curtain 21. As a result, it becomes possible to uniformly illuminate the object to be illuminated.

  In the first embodiment, when the light source module MJ1 is attached to any housing, it is not necessary to separately provide a positioning mechanism for accurately attaching the light source substrate 1 and the lighting curtain 21 to the housing. The lighting curtain 21 can be easily attached to the housing, and the component cost can be reduced. Furthermore, since the lighting curtain 21 is integrated with the light source substrate 1, the attaching process of the light source substrate 1 and the lighting curtain 21 to the housing is the same process. Therefore, the cost of the attachment process is reduced and the throughput of the attachment process is improved.

 In the first embodiment, since the exposure hole 22a for exposing (projecting) the LED package 11 is formed in the bottom portion 22 of the optical member 2, the bottom portion 22 of the optical member 2 is attached and fixed to the light source substrate 1. Even if it does it, it can suppress that the light emission of LED package 11 is inhibited by the bottom part 22 of the optical member 2. FIG.

  In the first embodiment, the bottom portion 22 of the optical member 2 is a reflecting portion (a portion that reflects light), so that light is reflected on the mounting surface 1 a of the light source substrate 1. For this reason, the absorption of light toward the mounting surface 1a of the light source substrate 1 is suppressed, so that the loss light is reduced and the light use efficiency is improved. Further, when light is reflected on the mounting surface 1 a of the light source substrate 1, the light directed toward the mounting surface 1 a of the light source substrate 1 is reflected toward the top surface portion (lighting curtain) 21 of the optical member 2. Therefore, the light (illumination light) emitted through the lighting curtain 21 increases and the luminance increases.

  Moreover, in 1st Embodiment, since the side part 23 of the optical member 2 becomes a reflection part (part which reflects light), it is lost by suppressing the absorption of the light which goes to the side part 23 of the optical member 2. Light is reduced and light utilization efficiency is further improved. Furthermore, since the light traveling toward the side portion 23 of the optical member 2 can be reflected toward the top surface portion (lighting curtain) 21 of the optical member 2, light (illumination light) emitted through the lighting curtain 21 is further increased. Increases brightness.

  In the first embodiment, the top surface portion (lighting curtain) 21, bottom portion 22, and side portion 23 of the optical member 2 are integrally formed, so that the top surface portion (lighting curtain) 21, bottom portion 22, and The optical member 2 which has the side part 23 integrally can be obtained.

  Further, in the configuration of the first embodiment, if the bottom portion 22 of the optical member 2 is attached and fixed to the light source substrate 1 using the method shown in FIG. 7, the bottom portion 22 of the optical member 2 can be easily attached to the light source. It can be attached and fixed to the substrate 1. Furthermore, since it is not necessary to provide any attachment part in the light source substrate 1 and the optical member 2, the structure of the light source substrate 1 and the optical member 2 is simplified.

  On the other hand, if the bottom portion 22 of the optical member 2 is attached and fixed to the light source substrate 1 using the method shown in FIGS. 8 and 9, the bottom portion 22 of the optical member 2 is attached and fixed to the light source substrate 1. Since there is no need to prepare any other member, the number of parts does not increase. Even when this method is used, it is easy to attach and fix the bottom 22 of the optical member 2 to the light source substrate 1.

  In the first embodiment, since the predetermined portion of the optical member 2 may protrude outward from the outer edge of the light source substrate 1 in plan view, the size of the light source substrate 1 can be made as small as possible. Therefore, the cost for the light source substrate 1 is reduced.

  In the first embodiment, the product information is displayed on a predetermined portion of the optical member 2 (a portion protruding outward from the outer edge of the light source substrate 1 in a plan view), so that the product information may be hidden. Absent. For this reason, product information can be easily identified. Further, when product information is displayed on a predetermined portion of the optical member 2, there is no need to provide a space for displaying product information in the light source substrate 1, and accordingly, the size of the light source substrate 1 can be reduced accordingly. The cost for the light source substrate 1 can be further reduced.

  In the first embodiment, when the light source module MJ1 is viewed in a cross section cut along the X direction (see FIG. 3), there is no partition between the LED packages 11 adjacent to each other in the X direction. A part of the light from the adjacent LED packages 11 is mixed until it enters the top surface portion (lighting curtain) 21 of the optical member 2. Therefore, even if there is a variation in luminance and chromaticity between the LED packages 11 adjacent in the X direction, the variation in luminance and chromaticity is less noticeable.

  In the first embodiment, since the plurality of LED packages 11 can be covered with one optical member 2, it is not necessary to assign one optical member 2 to each of the plurality of LED packages 11. Thereby, the increase in the number of parts is suppressed.

  In the optical member 2 of the first embodiment, the top surface portion (lighting curtain) 21, the bottom portion 22, and the side portion 23 are not integrally formed with the same material as the optical member 2, but the bottom portion 22 and Only the side portion 23 may be integrally formed, and the top surface portion (lighting curtain) 21 may be retrofitted and fixed (fixed by fitting or adhesive material) to the bottom portion 22 and the side portion 23 integrated with each other. . In this case, the top surface portion (lighting curtain) 21, the bottom portion 22 and the side portion 23 may be made of different materials.

  Furthermore, the top surface portion (lighting curtain) 21, the bottom portion 22 and the side portion 23 may be separately formed, and those obtained by combining them may be used as the optical member 2. In this case, the top surface portion (lighting curtain) 21, the bottom portion 22 and the side portion 23 may be made of different materials. For example, a finely foamed PET resin sheet is used as the top surface portion (lighting curtain) 21. It is conceivable that the light reflection sheet attached to a relatively thick resin sheet is used as the bottom part 22 and the white polycarbonate resin sheet is used as the side part 23. Of course, other materials may be used. However, with respect to the constituent materials of the top surface portion (lighting curtain) 21, the bottom portion 22 and the side portion 23, optical properties (such as light reflectance), mechanical properties (such as strength), productivity, and cost are taken into consideration. It is preferable to select by.

  When it is desired to actively transmit the light incident on the side portion 23 of the optical member 2, a plate-like member having a total light transmittance of 50% or more (for example, a transparent polycarbonate resin sheet or a thin white polycarbonate resin). The side part 23 of the optical member 2 may be formed by a sheet or the like. In this case, it can be said that the side part 23 of the optical member 2 is a translucent part.

(Second Embodiment)
Next, the configuration of the light source module MJ2 according to the second embodiment of the present invention will be described with reference to FIGS. In addition, about the member which has the same function as the member used for light source module MJ1 of 1st Embodiment, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  In the light source module MJ2 according to the second embodiment, an optical member 3 as shown in FIGS. 14 and 15 is used, and a part of the optical member 3 is attached and fixed to the light source substrate 1.

  However, in the second embodiment, unlike the first embodiment, the number of optical members 3 used is the same as the number of LED packages 11 mounted, and the optical member 3 is provided for each of the plurality of LED packages 11. One by one is assigned. That is, when the number of LED packages 11 mounted is four, the number of optical members 3 used is four.

  The structure of the optical member 3 of the second embodiment is substantially the same as the structure of the optical member 2 of the first embodiment. That is, the optical member 3 is disposed so as to face the mounting surface 1a of the light source substrate 1 and the top surface portion 31 that is disposed to face the mounting surface 1a of the light source substrate 1 with a predetermined interval (the top surface portion). 31 and a side portion 33 that connects the top surface portion 31 and the bottom portion 32 to each other.

  Further, the top surface portion 31 of the optical member 3 is a lighting curtain 31, and a plurality of openings 31a for transmitting light are formed there. An exposure hole 32 a for exposing (projecting) the LED package 11 is formed in the bottom 32 of the optical member 3. In the second embodiment, since one optical member 3 is assigned to each of the plurality of LED packages 11, the number of exposure holes 32a formed in the bottom 32 of each optical member 3 is one. It is.

  In the second embodiment, a plurality of optical members 3 (the same number as the number of LED packages 11 mounted) are arranged without gaps along the X direction, and the bottom 32 of each optical member 3 is attached and fixed to the light source substrate 1. Yes. Accordingly, each lighting curtain 31 (the top surface portion 31 of each optical member 3) is in a fixed state with respect to the light source substrate 1, and each overlapping portion (a portion to be overlapped with the LED package 11 in plan view). The positional deviation in the planar view between 31b and the LED package 11 is suppressed.

  Other configurations of the second embodiment are the same as those of the first embodiment.

  In the second embodiment, as described above, by assigning one optical member 3 to each of the plurality of LED packages 11, the total size of the plurality of lighting curtains 31 in plan view is the first embodiment. However, when the plurality of lighting curtains 31 are individually viewed, the size of each of the lighting curtains 31 in the plan view is the size of the lighting curtain 21 in the first embodiment in the plan view. Smaller than. Therefore, it becomes difficult for the lighting curtain 31 to bend, and the occurrence of uneven brightness can be further suppressed.

  By the way, in 2nd Embodiment, when it sees in the cross section (refer FIG. 15) which cut | disconnected light source module MJ2 along the X direction, between each LED package 11 adjacent to a X direction is divided by the side part 33 of the optical member 3. It becomes like. For this reason, when the constituent material of the side portion 33 of the optical member 3 is a reflecting material, that is, when the side portion 33 of the optical member 3 is a reflecting portion, the light from each LED package 11 adjacent in the X direction is light. Is reflected by the side 33 of each optical member 3.

  On the other hand, when the constituent material of the side portion 33 of the optical member 3 is a light-transmitting material (for example, a material having a total light transmittance of 50% or more), that is, the side portion 33 of the optical member 3 is transparent. In this case, part of the light from each LED package 11 adjacent in the X direction passes through the side portion 33 of each optical member 3, so that the top surface portion (lighting curtain) 31 of each optical member 3 It mixes before entering. Therefore, in this case, even if there is a variation in luminance and chromaticity between the LED packages 11 adjacent in the X direction, the light from the LED packages 11 adjacent in the X direction is partially mixed. The variation in luminance and chromaticity can be alleviated to some extent, and the variation in luminance and chromaticity becomes inconspicuous.

  Other effects of the second embodiment are the same as the effects of the first embodiment.

(Third embodiment)
Next, the configuration of the surface light source device according to the third embodiment will be described with reference to FIGS. The surface light source device according to the third embodiment is used as, for example, a backlight unit that illuminates a liquid crystal display panel.

  In the surface light source device according to the third embodiment, as shown in FIG. 16, a plurality of light source modules MJ1 are housed in a box-shaped chassis (housing) 41 having an opening for light emission, and the plurality of light source modules. The light emitting surface of MJ1 is directed to the opening side of the chassis 41. Since each of the plurality of light source modules MJ1 is the same as the light source module MJ1 of the first embodiment, detailed description thereof is omitted.

  As shown in FIG. 17, the plurality of light source modules MJ1 are spread in the X direction and the Y direction without gaps. In other words, the optical members 2 of the adjacent light source modules MJ1 are in contact with each other in each of the X direction and the Y direction.

  In this case, by forming the optical members 2 included in the plurality of light source modules MJ1 with high accuracy, the plurality of light source modules MJ1 can be arranged in the X direction and the Y direction without any gaps. The light source module MJ1 is positioned. That is, the light source substrate 1 included in each of the plurality of light source modules MJ1 can be accurately arranged at a desired position.

  Further, as shown in FIG. 16, the opening of the chassis 41 is closed by a diffusion plate 42 that diffuses light. Thus, when light is emitted from the plurality of light source modules MJ1, the light is diffused by the diffusion plate 42.

  FIG. 16 shows a state in which a space is provided between the plurality of light source modules MJ1 and the diffusion plate 42. However, a space is not provided between the plurality of light source modules MJ1 and the diffusion plate 42. Also good. However, if a space is provided between the plurality of light source modules MJ1 and the diffusion plate 42, the light emitted from the plurality of light source modules MJ1 is diffused before entering the diffusion plate 42, so that there is little luminance unevenness. It is easy to obtain relatively good planar light. Therefore, if possible, it is preferable to provide a space between the plurality of light source modules MJ1 and the diffusion plate 42.

  In addition, since adjustment of the space | interval between several light source module MJ1 and the diffusion plate 42 can be performed only by changing the height of the side part 23 of the optical member 2, it is very easy. Of course, the adjustment of the distance between the top surface portion (lighting curtain) 21 of the optical member 2 and the LED package 11 can be performed only by changing the height of the side portion 23 of the optical member 2.

  Here, in the third embodiment, as shown in FIGS. 16 and 18, a reflection sheet 43 that reflects light in addition to the plurality of light source modules MJ <b> 1 is accommodated in the chassis 41. Specifically, when an assembly made up of a plurality of light source modules MJ1 is simply referred to as a light emitter, a reflection sheet 43 is disposed so as to surround the light emitter in a plan view, whereby a space between the light emitter and the chassis 41 is arranged. The region A is filled with the reflection sheet 43.

  As a result, even if there is a gap (region A) between the light emitter and the chassis 41 in plan view, light is reflected by the reflection sheet 43 disposed in the region A, so that the diffusion plate Light is sufficiently incident on the end portion 42 a that overlaps the region A in plan view. Therefore, it is possible to suppress the luminance from being insufficient at the end portion 42a of the diffusion plate 42.

  Further, in this case, the size of the diffuser plate 42 (the size of the light emission opening of the chassis 41) is also changed by changing the size of the object to be illuminated (for example, a liquid crystal display panel). Even if there is some variation in the size of A, it is only necessary to change the size of the reflection sheet 43 or to adjust the number of the light source modules MJ1 accommodated in the chassis 41 and the arrangement position thereof. Can respond to body size changes. This eliminates the need to redesign the light source module MJ1. In other words, it becomes possible to illuminate objects of various sizes without luminance unevenness without changing the design of the conventional light source module MJ1, and the labor required for changing the size of the object to be illuminated is greatly reduced. .

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, an optical member that collectively covers a plurality of LED packages and an optical member that covers only one LED package may be attached and fixed to the same light source substrate. That is, the configuration of the first embodiment and the configuration of the second embodiment may be combined.

1 Light source board 1a Mounting surface 1b, 22c Fitting hole (fitting part)
1c, 22b Fitting protrusion (fitting part)
2, 3 Optical member 11 LED package (light source)
21, 31 Top (lighting curtain)
22, 32 Bottom 22a, 32a Exposed hole 23, 33 Side 24 Adhesive 25 Identification label (Product information)
43 Reflective sheet MJ1, MJ2 Light source module

Claims (14)

A light source;
A light source substrate having a mounting surface, and the light source mounted on the mounting surface;
An optical member having at least a lighting curtain that partially blocks light from the light source,
The optical member includes a top surface portion disposed to face the mounting surface of the light source substrate at a predetermined interval, a bottom portion disposed to face the mounting surface of the light source substrate, the top surface portion, and the Having side portions connecting the bottom portions to each other;
The light source module, wherein the top surface of the optical member is the lighting curtain, and the bottom of the optical member is attached and fixed to the light source substrate. An exposure hole is formed at the bottom of the optical member,
2. The light source module according to claim 1, wherein the bottom portion of the optical member is attached and fixed to the light source substrate in a state where the light source is exposed from the exposure hole in the bottom portion of the optical member.   The light source module according to claim 1, wherein a bottom portion of the optical member is a reflection portion that reflects light.   The light source module according to claim 1, wherein a bottom portion and a side portion of the optical member are integrally formed.   The light source module according to claim 4, wherein a top surface portion of the optical member is formed integrally with a bottom portion and a side portion of the optical member.   The light source module according to claim 1, wherein a side portion of the optical member is a reflection portion that reflects light.   The light source module according to claim 1, wherein a side portion of the optical member is a light transmitting portion having a total light transmittance of 50% or more.   The bottom portion of the optical member and the light source substrate are bonded to each other via an adhesive, whereby the bottom portion of the optical member is attached and fixed to the light source substrate. The light source module according to any one of 7. A fitting portion is provided on each of the bottom of the optical member and the light source substrate,
The bottom portion of the optical member and the fitting portion of the light source substrate are fitted to each other, whereby the bottom portion of the optical member is attached and fixed to the light source substrate. The light source module in any one of 1-7.   The predetermined portion of the optical member projects outward from the outer edge of the light source substrate when viewed in plan from the region facing the mounting surface of the light source substrate. The light source module according to 1.   The light source module according to claim 10, wherein product information is displayed on a predetermined portion of the optical member.   The light source module according to claim 1, wherein the light source is a light emitting diode.   A surface light source device comprising the light source module according to claim 1. The light source module includes a plurality of light source modules;
A reflection sheet for reflecting light is disposed so as to surround a light emitting body composed of the plurality of light source modules when viewed in a plan view from a region facing the mounting surface of the light source substrate. The surface light source device according to claim 13.

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