JP3139363U - Flat light source and surface light source using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat light source capable of enhancing versatility of a mounting substrate.
A wiring pattern 4 is provided with a plurality of first and second mounting portions 12 and 14 for mounting a plurality of light emitting elements 10 so as to be alternately electrically connected in series, and a plurality of resistors. A plurality of third attachment portions 16 for attaching the element 8 are provided so as to be electrically connected in parallel to the plurality of second attachment portions 14. A high illuminance configuration in which the plurality of light emitting elements 10 are attached to the plurality of first and second attachment portions 12, 14, the plurality of light emitting elements 10 are attached only to the plurality of first attachment portions 12, and the plurality of resistance elements 8 The wiring pattern 4 is configured such that a low illuminance form attached to the plurality of third attachment portions 16 can be selected.
[Selection] Figure 3

Description

  The present invention relates to a flat light source used for illuminating an object to be inspected, for example, in an image processing inspection, and a surface light source using the flat light source.

  Conventionally, when inspecting the quality of industrial products such as printed wiring boards and semiconductors, such as defective soldering, adhesion of foreign matter, or printing errors such as the date of manufacture printed on beverage cans on the production line In addition, an image processing inspection using imaging by a CCD camera or the like is performed. In this image processing inspection, an illumination device for illuminating an object to be inspected arranged in an illumination area is used.

  This illuminating device includes an attachment substrate having a wiring pattern, and a plurality of light emitting elements electrically connected to the wiring pattern (see, for example, Patent Document 1). The light emitting element is composed of a chip LED having a light emitting portion on the upper surface thereof. A plurality of attachment portions are arranged in a line on one side of the attachment substrate, and the light emitting elements are respectively attached to the plurality of attachment portions and electrically connected to the wiring pattern. When each of the plurality of light emitting elements emits light, the light from each light emitting element is irradiated toward the inspected object arranged in the illumination area, and thereby the inspected object is illuminated in a line shape.

JP-A-9-130545

  In the image processing inspection described above, it is necessary to appropriately set the illuminance of light that illuminates the inspection object in accordance with the purpose of the inspection. When illuminating the inspected object with high illuminance, it is necessary to increase the mounting density of the light emitting elements. For this purpose, a mounting board with a small mounting portion arrangement interval is prepared, and light is emitted to each of the mounting parts of the mounting board. By attaching the element, the light emitting element is attached to the attachment substrate with a high mounting density. In addition, when illuminating the object to be inspected with low illuminance, it is only necessary to reduce the mounting density of the light-emitting elements. For this purpose, a mounting board with a large mounting portion arrangement interval is prepared, and a plurality of mounting parts of the mounting board are provided. By attaching the light emitting elements respectively, the light emitting elements are attached to the mounting substrate with a low mounting density.

  However, the conventional lighting device has a problem in that the manufacturing cost of the lighting device increases because a plurality of types of mounting substrates with different mounting portion arrangement intervals must be prepared as described above.

  The objective of this invention is providing the flat light source which can improve the versatility of an attachment board | substrate, and a surface light source using the same.

The flat light source according to claim 1 of the present invention includes a mounting substrate having a wiring pattern, and a plurality of light emitting elements attached to the wiring pattern,
The wiring pattern is provided such that a plurality of first attachment portions and a plurality of second attachment portions for attaching the plurality of light emitting elements are alternately and electrically connected in series, and a plurality of resistance elements A plurality of third attachment portions for attaching the plurality of second attachment portions are electrically connected in parallel to the plurality of second attachment portions,
The high illuminance mode in which the plurality of light emitting elements are attached to the plurality of first and second attachment portions, the plurality of light emitting elements are attached only to the plurality of first attachment portions, and the plurality of resistance elements are the plurality of the plurality of resistance elements. The wiring pattern is configured such that a low illuminance form attached to the third attachment portion can be selected.

  In the flat light source according to claim 2 of the present invention, the wiring pattern is formed along a side edge portion of the mounting substrate, and each of the plurality of light emitting elements is substantially arranged with respect to the mounting surface. The plurality of light emitting elements are formed of side view type chip LEDs having light emitting portions that emit light in parallel, and the plurality of first light emitting elements are arranged such that the light emitting portions face outward of the side edge portions of the mounting substrate. And it is attached to a 2nd attachment part, It is characterized by the above-mentioned.

  Furthermore, in the surface light source according to claim 3 of the present invention, a plurality of flat light sources according to claim 2 are arranged close to each other in the thickness direction, and the light emitting elements of the flat light source and Each flat light source is arranged so that the plurality of light emitting elements of the adjacent flat light sources are arranged in a staggered manner.

  According to the flat light source of the present invention, since the wiring pattern is configured so that a high illuminance form and a low illuminance form can be selected, a flat form of a high illuminance form in which a plurality of light emitting elements can be attached to the mounting substrate with a high mounting density. And a low-illuminance flat light source in which a plurality of light-emitting elements are attached to a mounting substrate with a low mounting density can be selectively obtained. Therefore, it is possible to selectively manufacture a flat light source with a high illuminance form and a flat light source with a low illuminance form simply by preparing one type of attachment board having the same wiring pattern. Versatility can be improved.

  In addition, according to the flat light source of the present invention, the plurality of light emitting elements including the side-view type chip LED have a plurality of first light sources so that the light emitting portions face outward of the side edges of the mounting substrate. And since it attaches to the 2nd attachment part, the magnitude | size of the thickness direction of a flat light source can be restrained small, and, thereby, the magnitude | size of the whole flat light source can be reduced in size.

  Furthermore, according to the surface light source of the present invention, a plurality of flat light sources are arranged close to each other in the thickness direction, and a plurality of light emitting elements of the flat light source and a plurality of light emitting elements of the flat light source adjacent thereto are provided. Since each flat light source is arranged so as to be arranged in a staggered manner, a plurality of light emitting elements can be arranged in a plane shape with a substantially uniform mounting density, which makes the object to be inspected a plane with a substantially uniform illuminance. Can be illuminated.

  Hereinafter, an embodiment of a flat light source according to the present invention and a surface light source using the same will be described with reference to the accompanying drawings. FIG. 1 is a view showing a flat light source mounting substrate according to an embodiment of the present invention, FIG. 2 is a view showing a flat light source in a high illuminance form, and FIG. 3 is a view in a low illuminance form. 4 is a diagram showing a flat light source, FIG. 4 is a schematic sectional view showing an illuminating device unit equipped with a surface light source, FIG. 5 is a schematic perspective view showing the surface light source of FIG. 4, and FIG. FIG. 7 is a plan view showing a surface light source constituted by a flat light source having a high illuminance form shown in FIG. 2, and FIG. 7 is a plan view showing a surface light source constituted by a flat light source having a low illuminance form shown in FIG.

  1 to 3, the illustrated flat light source 2 includes a mounting substrate 6 having a wiring pattern 4, a plurality of resistance elements 8 and a plurality of light emitting elements 10 electrically connected to the wiring pattern 4. And. Hereinafter, each component of the flat light source 2 will be described in detail.

  The mounting substrate 6 is made of horizontally long thin plate-like aluminum. A wiring pattern 4 is provided on one side including one side edge of the mounting substrate 6. A plurality of first and second attachment portions 12 and 14 are alternately and electrically connected in series to the wiring pattern 4 located on one side edge of the attachment substrate 6, and a plurality of third attachment portions 16 are provided. Are electrically connected to the plurality of second attachment portions 14 in parallel. Each of the plurality of first to third attachment portions 12, 14, and 16 includes a pair of electrode pads. A pair of electrode terminal portions 18 electrically connected to the wiring pattern 4 is provided on the mounting substrate 6, and a power cable (not shown) from a power supply device (not shown) is provided on the pair of electrode terminal portions 18. ) Are electrically connected. In addition, the other side edge portion of the mounting substrate 6 is provided with a long hole 20 for mounting when a plurality of mounting substrates 6 are arranged close to each other in the thickness direction to form a surface light source 30 (described later). It has been.

  The light emitting element 10 is composed of a side view type chip LED having a light emitting portion 22 that emits light substantially parallel to the mounting surface (that is, one side of the mounting substrate). When the light emitting unit 22 emits light, the light is distributed in a solid square shape around the optical axis, and out of the light from the light emitting unit 22, a solid angle within a predetermined range around the optical axis (ie Most of the light is emitted within the effective emission angle. Further, the resistance element 8 is constituted by a chip resistor having a resistance value of, for example, about 0Ω.

  In the flat light source 2, a high illuminance form (see FIG. 2) in which the plurality of light emitting elements 10 are attached to the plurality of first and second attachment portions 12 and 14, and the plurality of light emitting elements 10 are the plurality of first attachment portions. The wiring pattern 4 is configured so that a low illuminance form (see FIG. 3) in which only a plurality of resistor elements 8 are attached to the plurality of third attaching portions 16 can be selected.

  In the high illuminance form, the pair of lead frame portions of the light emitting element 10 are electrically connected to the pair of electrode pads of each of the plurality of first and second mounting portions 12 and 14 by soldering. Thereby, the plurality of light emitting elements 10 are electrically connected in series, and the interval L1 (for example, about 1 mm) is set such that the light emitting portion 22 faces outward (upward in FIG. 2) of the side edge portion of the mounting substrate 6. Thus, they are arranged in a line. In this high illuminance form, the mounting density of the plurality of light emitting elements 10 is increased, and thereby the illuminance of light from the plurality of light emitting elements 10 is higher than in the case of the low illuminance form described later.

  In the low illuminance mode, the pair of lead frame portions of the light emitting element 10 are electrically connected to the pair of electrode pads of each of the plurality of first mounting portions 12 by soldering, and the plurality of third mounting portions. A pair of lead frame portions of the resistance element 8 are electrically connected to each pair of electrode pads 16 by soldering. As a result, as shown in FIG. 3, the light emitting elements 10 and the plurality of resistance elements 8 are electrically connected in series by being arranged in a line with a distance L2 (for example, about 5 mm) larger than the distance L1. Is done. In this low illuminance form, the mounting density of the plurality of light emitting elements 10 is low, and thereby the illuminance of light from the plurality of light emitting elements 10 is lower than in the case of the high illuminance form described above.

  Next, the illumination method using the flat light source 2 described above will be described as follows. When the flat light source 2 is configured in a high illuminance form, when predetermined power from the power supply device is supplied to the pair of electrode terminal portions 18 of the mounting substrate 6 through the power cable, a plurality of first and second attachments are provided. The light is supplied to the plurality of light emitting elements 10 via the units 12 and 14 and emitted.

  Further, when the flat light source 2 is configured in the low illuminance form, predetermined power from the power supply device is supplied to the plurality of light emitting elements 10 and the plurality of resistors via the plurality of first and third attachment portions 12 and 16. It is supplied to each element 8. In this low illuminance form, an object to be inspected (not shown) can be illuminated with light having an illuminance lower than that of the high illuminance form.

  Therefore, it is possible to selectively manufacture the flat light source 2 having a high illuminance form and the flat light source 2 having a low illuminance form by merely preparing one type of mounting substrate 6 having the same wiring pattern 4. The versatility of the mounting substrate 6 can be improved.

  Next, the usage method of the flat light source 2 mentioned above is demonstrated with reference also to FIGS. 4 includes a housing 28 having an opening 26, a surface light source 30 mounted inside the housing 28, and a cylindrical lens 32 provided in the opening 26 of the housing 28. Yes.

  The surface light source 30 includes the plurality of flat light sources 2 described above and an attachment member 34 for holding the plurality of flat light sources 2. The mounting member 34 is configured in a block shape, and a plurality of slit-shaped mounting recesses in which the other side end portions of the plurality of flat light sources 2 (mounting substrates 6) are detachably mounted at one end portion thereof. 36 is provided. The attachment member 34 is provided with attachment holes 38 corresponding to the long holes 20 provided in the attachment substrate 6.

  The other end of the mounting substrate 6 is inserted into the mounting recess 36, and a fixing screw 40 is inserted through the mounting hole 38 of the mounting member 34 and the long holes 20 of the plurality of mounting substrates 6, and the tip of the fixing screw 40 is inserted. By screwing the nuts 42 onto each other, the plurality of flat light sources 2 are held close to each other in the thickness direction (that is, facing substantially parallel to each other). When held in this way, the plurality of light emitting elements 10 of the plurality of flat light sources 2 are arranged in a lattice pattern, and the surface light source 30 in a high illuminance form is configured (see FIG. 6).

  When the flat light source 2 is used to make the surface light source 30 in the low illuminance form, a plurality of flat light sources are arranged in the same manner as described above so that the adjacent flat light sources 2 are biased by a predetermined distance in the longitudinal direction. 2 are held close to each other in the thickness direction. Thereby, the several light emitting element 10 of the surface light source 30 comprised from the some flat light source 2 is arrange | positioned in zigzag form (refer FIG. 7).

  In the lighting device unit 24 of FIG. 4, when the plurality of light emitting elements 10 of each flat light source 2 emit light, light from the light emitting portion 22 of the light emitting element 10 enters the cylindrical lens 32, and the cylindrical lens 32 causes The light is bent in the direction approaching the optical axis and emitted from the cylindrical lens 32. As a result, the light from the cylindrical lens 32 is condensed toward the specific area, and the inspection object disposed in the illumination area is illuminated. Further, heat generated when each of the plurality of light emitting elements 10 emits light is transmitted to the mounting substrate 6 made of aluminum to be dissipated.

  Next, another embodiment of a surface light source using a flat light source according to the present invention will be described with reference to FIG. FIG. 8 is a schematic cross-sectional view illustrating a surface light source according to another embodiment of the present invention. In other embodiments, components that are substantially the same as those in the above embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the flat light sources 2Aa to 2Ae of the surface light source 30A according to this other embodiment, the other surface of the attachment substrates 6Aa to 6Ae (that is, the surface on which the plurality of light emitting elements 10 are not attached) A heat radiating plate 48 made of aluminum, copper or the like is attached via a not-shown). In addition, a plurality of mounting recesses 36Aa to 36Ae to which the other side ends of the plurality of mounting boards 6Aa to 6Ae are detachably mounted are provided at one side end of the mounting member 34A. An attachment recess 36Ac is provided at the center of the one end of the attachment member 34A so as to extend substantially perpendicular to the one end of the attachment member 34A, and a pair of attachments is provided on both sides of the attachment recess 36Ac. Recesses 36Ab, 36Ad are provided to be inclined at a predetermined angle θ1 with respect to one end of the attachment member 34A, and a pair of attachment recesses 36Aa, 36Ae are provided on both sides of the pair of attachment recesses 36Ab, 36Ad. The mounting member 34A is provided to be inclined and extend by a predetermined angle θ2 larger than the predetermined angle θ1 with respect to one side end portion of the mounting member 34A. The attachment member 34A is made of aluminum, and a plurality of fin portions 50 are provided on the other side end.

  When the plurality of mounting substrates 6Aa to 6Ae are respectively mounted in the plurality of mounting recesses 36Aa to 36Ae, the plurality of flat light sources 2Aa to 2Ae are arranged so that the light emitting portions 22 of the plurality of light emitting elements 10 face a specific region. Therefore, the light from the plurality of light emitting elements 10 is condensed toward a specific area, and thereby the object to be inspected (not shown) arranged in the specific area has a substantially uniform illuminance and a high illuminance. Can be illuminated.

  Further, heat from the plurality of light emitting elements 10 is transmitted to the heat radiating plate 48 through the heat conductive sheet, and is radiated from the heat radiating plate 48 and is also transmitted to the mounting member 34A through the heat radiating plate 48. The heat is radiated from the plurality of fin portions 50 of 34A.

  Although various embodiments of the flat light source and the surface light source using the flat light source according to the present invention have been described above, the present invention is not limited to such embodiments, and various modifications can be made without departing from the scope of the present invention. Or it can be modified.

  For example, in each of the above embodiments, the plurality of light emitting elements 10 are attached to one side of the mounting substrate 6 (6Aa to 6Ae), but the plurality of light emitting elements 10 are attached to both sides of the mounting substrate 6 (6Aa to 6Ae). You may do it.

  Further, for example, in each of the embodiments described above, the light emitting element 10 is configured by the side view type chip LED. However, the present invention is not limited to this, and the light emitting element 10 may be configured by a chip LED having a light emitting portion on the upper surface or a bullet type LED. Good.

It is a figure which shows the attachment board | substrate of the flat light source by one Embodiment of this invention. It is a figure which shows the flat light source in a high illumination form. It is a figure which shows the flat light source in a low illumination intensity form. It is a schematic sectional drawing which shows the illuminating device unit which mounts a surface light source. It is a schematic perspective view which shows the surface light source of FIG. It is a top view which shows the surface light source comprised by the flat light source of the high illumination intensity form of FIG. It is a top view which shows the surface light source comprised by the flat light source of the low illumination intensity form of FIG. It is a schematic sectional drawing which shows the surface light source by other embodiment of this invention.

Explanation of symbols

2, 2 Aa to 2 Ae Flat light source 4 Wiring pattern 6, 6 Aa to 6 Ae Mounting board 8 Resistance element 10 Light emitting element 12 First mounting portion 14 Second mounting portion 16 Third mounting portion 22 Light emitting portion 30 Surface light source

Claims (3)

An attachment board having a wiring pattern, and a plurality of light emitting elements attached to the wiring pattern,
The wiring pattern is provided such that a plurality of first attachment portions and a plurality of second attachment portions for attaching the plurality of light emitting elements are alternately and electrically connected in series, and a plurality of resistance elements A plurality of third attachment portions for attaching the plurality of second attachment portions are electrically connected in parallel to the plurality of second attachment portions,
The high illuminance mode in which the plurality of light emitting elements are attached to the plurality of first and second attachment portions, the plurality of light emitting elements are attached only to the plurality of first attachment portions, and the plurality of resistance elements are the plurality of the plurality of resistance elements. A flat light source characterized in that the wiring pattern is configured so that a low illuminance form attached to the third attachment portion can be selected.   The wiring pattern is formed along a side edge portion of the mounting substrate, and each of the plurality of light emitting elements includes a side view type chip LED having a light emitting portion that emits light substantially parallel to the mounting surface. 2. The plurality of light emitting elements, wherein the plurality of light emitting elements are attached to the plurality of first and second attachment portions such that the light emitting portion faces outward of a side edge portion of the attachment substrate. The flat light source described in 1.   A plurality of the flat light sources according to claim 2 are arranged close to each other in the thickness direction, and the plurality of light emitting elements of the flat light source and the plurality of light emitting elements of the flat light source adjacent thereto are staggered. Each flat light source is arranged so as to be arranged in a shape.

Images