WO2014010072A1

WO2014010072A1 - Illumination device

Info

Publication number: WO2014010072A1
Application number: PCT/JP2012/067890
Authority: WO
Inventors: 泰弘山下; 篤規平野; 修岡村; 純一高砂; 悠也佐々木
Original assignee: 富士機械製造株式会社
Priority date: 2012-07-13
Filing date: 2012-07-13
Publication date: 2014-01-16
Also published as: JP5956577B2; JPWO2014010072A1

Abstract

This illumination device is provided with a frame, a transparent flexible substrate arranged on the surface of the frame, at least one light source mounted on the transparent flexible substrate, and a reflection layer positioned between the frame and the transparent flexible substrate. In this configuration, light incident on the transparent flexible substrate passes through the transparent flexible substrate and is reflected by the reflection layer. The reflected light passes again through the transparent flexible substrate and is irradiated at an object to be illuminated. Because absorption of light by the flexible substrate and frame is prevented, this illumination device has a high illuminance.

Description

Lighting device

The technology disclosed herein relates to a lighting device.

Japanese Patent Laid-Open No. 2002-184209 discloses an illumination device. This illuminating device has a housing, a flexible substrate disposed on the surface of the housing, and a plurality of light-emitting diodes mounted flexibly. The surface of the flexible substrate on which the light emitting diode is mounted is painted in white or metallic color, and serves as a reflective surface that reflects the light of the light emitting diode.

When the white or metallic paint is applied to the flexible substrate, the light emitted from the light emitting diode is prevented from being absorbed by the flexible substrate. Therefore, the illuminance of the lighting device can be improved. However, in such a configuration, it is necessary to form a coating film on the surface of the flexible substrate on which the light emitting diode is mounted (hereinafter simply referred to as the front surface). A plurality of terminals connected to the light emitting diodes are provided on the front surface of the flexible substrate. If paint adheres to these terminals, poor connection with the light emitting diodes occurs. Therefore, in the conventional configuration, it is necessary to perform a fine painting operation while avoiding these terminals.

Considering the above problems, here, a technique for improving the illuminance of the lighting device with a simple configuration of manufacture is disclosed.

In this technology, a transparent flexible substrate is adopted as the flexible substrate on which the light source is mounted. By adopting the transparent flexible substrate, it is possible to dispose a reflective layer between the housing and the transparent flexible substrate. That is, it is not necessary to form a reflective layer on the front surface of the flexible substrate, that is, the surface on which the light emitting diode is mounted. Therefore, the lighting device can be easily manufactured.

In one embodiment of the present technology, the lighting device is positioned between the casing, the transparent flexible substrate disposed on the surface of the casing, at least one light source mounted on the transparent flexible substrate, and the casing and the transparent flexible substrate. A reflective layer. According to this configuration, light incident on the transparent flexible substrate passes through the transparent flexible substrate and is reflected by the reflective layer. The reflected light passes through the transparent flexible substrate again and is irradiated toward the illumination target. Since light absorption by the flexible substrate or the housing is prevented, the illuminance of the lighting device can be improved.

FIG. 3 is a schematic diagram illustrating the lighting device 10 according to the first embodiment. 1 is a block diagram illustrating a circuit structure of a lighting device 10 according to a first embodiment. FIG. 2 is a schematic diagram illustrating a cross section of the illumination device 10 according to the first embodiment. FIG. 6 is a schematic diagram illustrating a lighting device 110 according to a second embodiment.

In one embodiment of the present technology, the transparent flexible substrate may have a transmittance of 80% or more, more preferably 90% or more with respect to light in a visible light region emitted from at least a light source.

In one embodiment of the present technology, the reflective layer may be a coating film made of a white, light or metallic paint. However, the reflective layer may be a plated layer made of a metal material. These coating films or plating layers may be provided on the back surface of the transparent flexible substrate, or may be provided on the surface of the casing on which the transparent flexible substrate is disposed.

In one embodiment of the present technology, the reflective layer is preferably a film formed on the surface of the casing. This is because the surface of the housing having a certain strength is easier to form the reflective layer than the back surface of the flexible transparent flexible substrate. Alternatively, the surface itself can be made a reflective surface by making the housing material white, light or metallic. In this case, the surface layer portion of the casing is regarded as a reflective layer positioned between the casing and the transparent flexible substrate.

In one embodiment of the present technology, the reflective layer may be a sheet member disposed between the housing and the transparent flexible substrate. In this case, the sheet member is preferably white, light or metallic. The material of the sheet member may be any of a paper material, a resin material, a rubber material, and a metal material, for example, and is not particularly limited.

In one embodiment of the present technology, it is preferable that the housing has an inner surface having an opening and a rotationally symmetric shape with respect to the central axis of the opening. In this case, the transparent flexible substrate is preferably disposed on the inner surface of the housing. According to this configuration, most of the light emitted from the light source can be emitted from the opening toward the illumination target. However, the configuration and shape of the housing are not particularly limited. The housing may be curved plate, flat plate or other shape.

In one embodiment of the present technology, the light source is preferably a light emitting diode. When a light emitting diode is employed as the light source, the power consumption of the lighting device can be significantly reduced. Here, the color of the light emitting diode is not particularly limited, and may be, for example, red, blue, green, or white.

Referring to the drawings, the lighting device 10 of the first embodiment will be described. Although the illuminating device 10 of a present Example is an example, it is used for industrial apparatuses, such as a mounting machine which mounts an electronic component on a circuit board. For example, in a mounting machine, an electronic component sucked by a suction nozzle is photographed by a camera, and it is inspected whether or not the electronic component is correctly held with respect to the suction nozzle. The illuminating device 10 of this embodiment is equipped to illuminate the nozzles and electronic components that are the subject of photographing. However, the illuminating device 10 of a present Example is not restricted to industrial equipment, It can employ | adopt widely in various apparatuses.

As shown in FIG. 1, the lighting device 10 includes a housing 12 and a base portion 20 that supports the housing 12. The base portion 20 is provided with a plurality of pairs of

power input terminals

22 and 24. The housing 12 is a hollow member having an opening 12b. The opening 12 b is located on the side opposite to the base portion 20. The inner surface 12a of the housing 12 has a rotationally symmetric shape with respect to the central axis of the opening 12b. The inner surface 12a of the housing 12 is curved inward along the base portion 20 from the opening 12b. In brief, the inner surface 12a of the housing 12 has a generally mortar shape. The casing 12 of the present embodiment is made of a resin material. However, the housing 12 is not limited to a resin material, and can be formed of a metal or other material. In addition, although the housing 12 of a present Example is an example, it is comprised by eight segments arrange | positioned in the circumferential direction.

As shown in FIG. 1, the lighting device 10 has a plurality of transparent flexible substrates 16. The plurality of transparent flexible substrates 16 are respectively disposed on the inner surface 12 a of each segment of the housing 12. The transparent flexible substrate 16 can be formed of, for example, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), or other transparent resin materials. The transparent flexible substrate 16 of the present embodiment is substantially colorless and transparent, and has a transmittance of 90% or more with respect to light in the visible light range.

A plurality of light emitting diodes 18 which are light sources of the lighting device 10 are mounted on the transparent flexible substrate 16. The plurality of light emitting diodes 18 are arranged at equal intervals along the transparent flexible substrate 16. In addition, the light source of the illuminating device 10 is not limited to a light emitting diode, and may be another light emitter. Further, the color of light emitted from the light source is not particularly limited. However, the transparent flexible substrate 16 described above may have a transmittance of 80% or more, preferably 90% or more, with respect to light in the visible light range emitted from the light source of the lighting device 10.

FIG. 2 is a block diagram showing a circuit configuration of the lighting device 10. As shown in FIG. 2, each transparent flexible substrate 16 is provided with a printed wiring 26 and a plurality of terminals 28. Each terminal 28 is provided on the printed wiring 26 and is electrically connected to a corresponding one light emitting diode 18. The printed wiring 26 connects the plurality of light emitting diodes 18 in series and electrically connects the plurality of light emitting diodes 18 to the pair of

power input terminals

22 and 24. The printed wiring 26 and the terminal 28 can be formed of, for example, copper or other conductive material. Note that the printed wiring 26 and the terminal 28 may be formed of a transparent conductive material such as indium tin oxide (ITO). The printed wiring 26 may connect a plurality of light emitting diodes 18 in parallel.

FIG. 3 is a cross-sectional view showing a laminated structure of the housing 12 and the transparent flexible substrate 16. As shown in FIG. 3, the transparent flexible substrate 16 has a front side surface 16 a on which a plurality of light emitting diodes 18 are mounted, and a back side surface 16 b facing the inner surface 12 a of the housing 12. The printed wiring 26 and the terminal 28 described above are provided on the front surface 16 a of the transparent flexible substrate 16. A reflective layer 14 is provided between the housing 12 and the transparent flexible substrate 16. The reflective layer 14 reflects light that has passed through the transparent flexible substrate 16. The reflective layer 14 of the present embodiment is a white or metallic paint film, and is formed on the inner surface 12 a of the housing 12. However, the reflective layer 14 is not particularly limited as long as it can reflect light, and its configuration and material are not particularly limited.

As shown in FIG. 3, the light from the light emitting diode 18 and the light reflected by the illumination target enter the transparent flexible substrate 16 (see arrow X in FIG. 3). Incident light X on the transparent flexible substrate 16 passes through the transparent flexible substrate 16 and is reflected by the reflective layer 14 (see arrow Y in FIG. 3). The reflected light Y passes through the transparent flexible substrate 16 again and is irradiated to the illumination target. Thus, since most of the light emitted from the light emitting diode 18 is irradiated onto the illumination target, the lighting device 10 can illuminate the illumination target more strongly.

In the lighting device 10 of the present embodiment, a transparent flexible substrate 16 is employed, and a reflective layer 14 is disposed between the housing 12 and the transparent flexible substrate 16. According to this configuration, the reflective layer 14 can be formed on the inner surface 12 a of the housing 12 and the back surface 16 b of the transparent flexible substrate 16. As described above, the printed wiring 26 and the plurality of terminals 28 are formed on the front surface 16 a of the transparent flexible substrate 16. Since it is not necessary to form the reflective layer 14 on such a front surface 16a, the lighting device 10 can be easily manufactured.

Although the reflective layer 14 of this example is a white or metallic paint film, the reflective layer 14 may be a paint film of another color that can reflect light. In particular, the color of the reflective layer 14 may be selected according to the color of light emitted from the light emitting diode 18. For example, when the light emitting diode 18 emits red light, the reflective layer 14 may be red. The reflective layer 14 is not limited to a coating film, and may be a metal foil or other sheet material interposed between the housing 12 and the transparent flexible substrate 16.

With reference to FIG. 4, the illuminating device 110 of Example 2 is demonstrated. As illustrated in FIG. 4, the lighting device 110 includes a housing 112, a transparent flexible substrate 116 disposed on the surface of the housing 112, and a plurality of light emitting diodes 118 mounted on the transparent flexible substrate 116, as in the first embodiment. And a reflective layer 114 that is located between the surface of the housing 112 and the transparent flexible substrate 116 and reflects light transmitted through the transparent flexible substrate 116. On the transparent flexible substrate 116, printed wiring (not shown) for electrically connecting each light emitting diode 118 to the pair of

power input terminals

122 and 124 is formed.

In this embodiment, the housing 112 has a flat plate shape, which is different from the lighting device 10 of the first embodiment in this respect. About another structure, it is the same as that of the illuminating device 10 of Example 1. FIG. The shapes of the

housings

12 and 112 can be variously changed according to the purpose and object of illumination.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

The technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

DESCRIPTION OF SYMBOLS 10, 110: Illuminating device 12, 112: Housing 14, 114: Reflective layer 16, 116: Transparent flexible substrate 18, 118: Light emitting diode 26: Printed wiring 28: Terminal

Claims

The body,
A transparent flexible substrate disposed on the surface of the housing;
At least one light source mounted on the transparent flexible substrate;
A reflective layer that is located between the housing and the surface of the transparent flexible substrate and reflects light transmitted through the transparent flexible substrate;
A lighting device comprising:
The lighting device according to claim 1, wherein the transparent flexible substrate has a transmittance of 80% or more for at least light in a visible light range emitted from the light source.
The lighting device according to claim 1 or 2, wherein the reflective layer is a film formed on a surface of the casing.
The housing has an opening and an inner surface having a rotationally symmetric shape with respect to the central axis of the opening,
The lighting device according to any one of claims 1 to 3, wherein the transparent flexible substrate is disposed on an inner surface of the casing.
The lighting device according to any one of claims 1 to 4, wherein the light source is a light emitting diode.