JP2017174745A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce color unevenness appearing in an image formed on an image forming surface which is illuminated.SOLUTION: A luminaire includes: a plurality of light sources 18 mounted on one substrate and arranged at a plurality of positions different from each other respectively; a cutter device in which an opening is formed; and an image forming lens for forming an image on an image forming surface with the light which has passed the opening out of the light emitted from the plurality of light sources 18. The plurality of light sources 18 include: a plurality of first light sources for emitting first light; and a plurality of second light sources for emitting second light whose wavelength is shorter than that of the first light. A region 21 in which the plurality of light sources 18 are arranged includes: an inside region 22; and an outside region 23 for surrounding the inside region 22. The plurality of first light sources are arranged in the inside region 22 and the outside region 23. The plurality of second light sources are not arranged in the outside region 23 but arranged in the inside region 22.SELECTED DRAWING: Figure 2

Description

  Embodiments described herein relate generally to a lighting device.

  Spotlights that illuminate part of a studio, stage, or museum are known. Such a spotlight includes a light source, a light shielding member, and a convex lens. The light emitted from the light source passes through an opening formed in the light shielding member, and is condensed by the convex lens, thereby forming an image on an illuminated imaging surface (see Patent Document 1). . Such a spotlight is required to have a small degree of color unevenness appearing in an image formed on the imaging surface.

JP 2014-175126 A

  The problem to be solved by the present invention is to provide an illuminating device that reduces color unevenness appearing in an image formed on an imaged surface to be illuminated.

  The lighting device according to the embodiment includes a plurality of light sources, a cutter, and a lens. The plurality of light sources are mounted on one substrate and are respectively arranged at a plurality of different positions. The cutter has an opening. The lens forms an image on the imaging plane of the light emitted from the plurality of light sources that has passed through the opening. The plurality of light sources include a plurality of first light sources that emit first light and a plurality of second light sources that emit second light having a shorter wavelength than the first light. The region in which the plurality of light sources are arranged includes a first region and a second region surrounding the first region. The plurality of first light sources are disposed in the first region and the second region. The plurality of second light sources are not disposed in the second region, but are disposed in the first region.

FIG. 1 is a diagram illustrating an illumination device according to an embodiment. FIG. 2 is a plan view showing the light source device. FIG. 3 is an optical path diagram showing an optical path in which light emitted from a plurality of light sources forms an image on an image plane. FIG. 4 is a plan view showing a modified light source device.

  The illumination device 1 according to the embodiment described below includes a plurality of light sources 18, a cutter 5, and a lens 3. The plurality of light sources 18 are mounted on one substrate 17 and are respectively disposed at a plurality of different positions. The cutter 5 has an opening 8 formed therein. The lens 3 forms an image on the image plane 12 of light that has passed through the opening 8 among the light emitted from the plurality of light sources 18. The plurality of light sources 18 include a plurality of first light sources that emit first light and a plurality of second light sources that emit second light having a shorter wavelength than the first light. The region 21 (42) where the plurality of light sources 18 are arranged includes a first region 22 (43) and a second region 23 (44, 45) surrounding the first region 22. The plurality of first light sources are arranged in the first region 22 and the second region 23. The plurality of second light sources are not disposed in the second region 23 but are disposed in the first region 22.

  In addition, the plurality of first light sources of the illumination device according to the embodiment described below includes a plurality of third light sources that emit third light, and a plurality of fourth light sources that emit fourth light having a shorter wavelength than the third light. Is included. The second regions 44 and 45 are arranged between the first region 43 and the third region 45 so as to surround the first region 43 inside the third region 45 and the third region 45 surrounding the first region 43. 4th area | region 44 to be included. The plurality of third light sources are arranged in the third region 45 and the fourth region 44. The plurality of fourth light sources are not disposed in the third region 45 but are disposed in the fourth region 44.

  Hereinafter, an illumination device according to an embodiment will be described with reference to the drawings. In the embodiment, the same parts are denoted by the same reference numerals, and redundant description is omitted.

[Embodiment]
[Configuration of lighting device]
Drawing 1 is a figure showing lighting installation 1 of an embodiment. As shown in FIG. 1, the illumination device 1 includes a light source device 2, an imaging lens 3, and a cutter device 5, and includes a base (not shown). The light source device 2 is fixed to the base. The light source device 2 emits light by a user operation. The imaging lens 3 is formed from a convex lens. The imaging lens 3 is disposed in front of the light source device 2 so as to be illuminated by light emitted from the light source device 2, and is disposed so that the optical axis 7 of the convex lens intersects the light source device 2. The imaging lens 3 is further supported by a base so as to be parallel to the optical axis 7 and movable in parallel. The imaging lens 3 is further fixed to the base so as to be disposed at a position away from the light source device 2 by a predetermined position.

  The cutter device 5 is made of a material that does not transmit visible light, is formed in a plate shape, and has an opening 8 formed therein. The cutter device 5 is disposed between the light source device 2 and the imaging lens 3 so as to be along a plane perpendicular to the optical axis 7, and is supported by the base so as to be parallel to the optical axis 7. The cutter device 5 is fixed to the base so as to be disposed at a position away from the imaging lens 3 by a predetermined position. The cutter device 5 further includes a plurality of cutter blades not shown. Each of the plurality of cutter blades is made of a material that does not transmit visible light, and is formed in a plate shape. The plurality of cutter blades are arranged around the opening 8 along the cutter device 5 and are supported by the cutter device 5 so as to be able to move along the cutter device 5. In the cutter device 5, the shape of the opening 8 is changed by moving a plurality of cutter blades.

  FIG. 1 further shows a screen 11 illuminated by the illumination device 1. The screen 11 has a flat imaging surface 12 formed thereon. When the screen 11 is disposed at a position away from the lighting device 1 by a predetermined distance so that the imaging surface 12 is perpendicular to the optical axis 7, the screen 11 is imaged when illuminated by the lighting device 1. The projection light 14 is imaged on the surface 12. The shape of the projection light 14 corresponds to the shape of the opening 8.

[Multiple light sources]
FIG. 2 is a plan view showing the light source device 2. The light source device 2 includes an LED module 16 as shown in FIG. The LED module 16 is disposed on the surface of the light source device 2 that faces the imaging lens 3. The LED module 16 is a chip-on-board (COB) type module, and includes a substrate 17 and a plurality of light sources 18. The substrate 17 is formed in a flat plate shape. Each of the plurality of light sources 18 is formed of a light emitting diode (LED: Light Emitting Diode). The plurality of light sources 18 are arranged at a plurality of different positions on one surface of the substrate 17 and mounted on the substrate 17. Each of the light sources 18 emits light when power is supplied from the substrate 17.

  A region 21 on the surface of the substrate 17 where the plurality of light sources 18 are arranged is formed of an inner region 22 and an outer region 23. The inner region 22 is disposed approximately at the center of the region 21 so as to intersect the optical axis 7 of the imaging lens 3. The outer region 23 is formed so as to surround the inner region 22.

  The plurality of light sources 18 are formed of a plurality of white light sources, a plurality of red light sources, a plurality of green light sources, and a plurality of blue light sources. The plurality of white light sources emit white light when controlled by the light source device 2. The white light includes red light, green light, and blue light, and is formed by mixing red light, green light, and blue light. The plurality of red light sources emit red light when controlled by the light source device 2. The plurality of green light sources emit green light when controlled by the light source device 2. The green light emitted from the plurality of green light sources has a shorter wavelength than the red light emitted from the plurality of red light sources. The plurality of blue light sources emit blue light as controlled by the light source device 2. The blue light emitted from the plurality of blue light sources has a shorter wavelength than the green light emitted from the plurality of green light sources.

  At this time, the plurality of white light sources are not disposed in the outer region 23 but are disposed only in the inner region 22. The plurality of red light sources are arranged in both the inner region 22 and the outer region 23. The plurality of green light sources are arranged in both the inner region 22 and the outer region 23. The plurality of blue light sources are not disposed in the outer region 23 but are disposed only in the inner region 22.

  The light source device 2 is configured such that the intensity of white light emitted from a plurality of white light sources, the intensity of red light emitted from a plurality of red light sources, and the intensity of green light emitted from a plurality of green light sources by a user operation. The intensity of blue light emitted from each blue light source is adjusted independently of each other. The illumination device 1 can adjust the color of the projection light 14 to various colors by adjusting the intensity of light emitted from the plurality of light sources 18 in this way.

[Optical path where light from multiple light sources forms an image on the image plane]
FIG. 3 is an optical path diagram showing an optical path in which light emitted from a plurality of light sources 18 forms an image on the imaging plane 12. As shown in FIG. 3, a part of the light emitted from the plurality of light sources 18 passes through the opening 8 of the cutter device 5, and the remaining light is blocked by the cutter device 5. A part of the light that has passed through the opening 8 is incident on the imaging lens 3. The light incident on the imaging lens 3 is refracted by the refracting surface formed by the imaging lens 3. The light refracted by the imaging lens 3 illuminates the imaging surface 12 and forms an image on the imaging surface 12. The shape of the projection light 14 imaged on the imaging surface 12 is similar to the shape of the opening 8 of the cutter device 5.

  Of the light emitted from the light source 31 arranged at the edge of the region 21 of the plurality of light sources 18, the light 33 that has passed through the edge 32 on the opposite side of the opening 8 is applied to the edge 34 of the imaging lens 3. Incident. The light 33 is refracted when entering the edge 34 of the imaging lens 3. When the light 33 is refracted by the imaging lens 3, the light 33 is dispersed due to chromatic aberration and projected onto a range 35 having a width in a direction perpendicular to the optical axis 7 in the imaging surface 12. At this time, the short wavelength of the light 33 is projected on the side of the range 35 far from the optical axis 7, and the short side of the light 33 on the side of the range 35 near the optical axis 7 is projected. Light is projected.

  The light 37 that has passed through the edge 32 of the opening 8 out of the light emitted from the light source 36 disposed substantially in the center of the region 21 of the plurality of light sources 18 is transmitted from the edge 34 of the imaging lens 3. The light enters the portion 38 on the side close to the optical axis 7. The light 37 is refracted when entering the portion 38 of the imaging lens 3. When the light 37 is refracted by the imaging lens 3, the light 37 is dispersed due to chromatic aberration and projected onto a range 39 having a width in a direction perpendicular to the optical axis 7 in the imaging surface 12. At this time, light having a short wavelength among the light 37 is projected on the side far from the optical axis 7 in the range 39, and a wavelength near the optical axis 7 in the range 39 is long on the side of the light 37. Light is projected.

  For this reason, the projection light 14 imaged on the imaging surface 12 is projected with short-wavelength light on the edge of the projection light 14 when all of the light sources 18 emit white light. Becomes bluish, and color irregularities appearing in different colors between the edge of the projection light 14 and the center of the projection light 14 appear.

  Here, the incident angle at which the light 33 is incident on the surface of the edge 34 of the imaging lens 3 is such that the light source 31 is arranged on the side farther from the optical axis 7 than the light source 36. It is larger than the incident angle incident on the surface of the portion 38. Further, the incident angle at which the light transmitted through the edge 34 of the imaging lens 3 is incident on the surface on the imaging surface 12 side is such that the light transmitted through the portion 38 of the imaging lens 3 is incident on the surface on the imaging surface 12 side. It is larger than the incident angle. For this reason, the degree to which the light 33 is dispersed by refracting the surface of the imaging lens 3 is larger than the degree to which the light 37 is dispersed by refracting the surface of the imaging lens 3, and the width of the range 35 is the range 39. Greater than width. Furthermore, the range 35 is wider than the range 39, and therefore, the range 35 is wider than the range 39, and the portion where the short wavelength light is projected is wider, and the bluish portion is wider. In the range 35, when the light emitted from the light source 31 does not include short-wavelength light, the end far from the optical axis 7 moves to the side close to the optical axis 7, and the range 35 is bluish. The width of the part which becomes small becomes small.

  Light emitted from a plurality of light sources 18 is projected on the edge of the projection light 14. The white light source and the blue light source among the plurality of light sources 18 emit light (blue light) having a shorter wavelength than the light emitted from the red light source and the green light source. The light emitted from the white light source and the blue light source is formed at the edge of the projection light 14 when projected on the edge of the projection light 14 by the white light source and the blue light source being arranged in the inner region 22. The width of the bluish area to be produced is relatively small. The light emitted from the red light source and the green light source does not include light having a short wavelength (blue light), so that the edge of the projection light 14 is bluish when projected onto the edge of the projection light 14. Does not form a region. That is, the width of the bluish portion of the edge of the projection light 14 is arranged in the outer region 23 when the light emitted from the light source arranged in the outer region 23 does not include short wavelength light. Compared to the case where the light emitted from the light source includes light having a short wavelength, the light becomes smaller. For this reason, the illuminating device 1 of the embodiment is a portion in which the edges of the projection light 14 are bluish due to the fact that the plurality of white light sources and the plurality of blue light sources among the plurality of light sources 18 are not arranged in the outer region 23. The width of can be reduced. The illumination device 1 according to the embodiment can reduce the unevenness of the color of the projection light 14 by reducing the width of the portion where the blue light is projected onto the edge of the projection light 14. Can be reduced.

  By the way, the imaging lens 3 of the illumination device of the embodiment is formed from one convex lens, but may be formed from a plurality of convex lenses. In the illumination device 1 of the embodiment, even when the imaging lens 3 is replaced with another imaging lens formed of a plurality of convex lenses, a light source that does not emit short-wavelength light is disposed in the outer region 23. Thus, the degree of color unevenness of the projection light 14 can be reduced.

  In addition, although the shape of the opening part 8 is variable in the cutter apparatus 5 of the illuminating device 1 of embodiment, the shape of the opening part 8 may be fixed. In the illumination device 1 of the embodiment, even when the cutter device 5 is replaced with another cutter device in which the shape of the opening 8 is fixed, a light source that does not emit short-wavelength light is disposed in the outer region 23. Thus, the degree of color unevenness of the projection light 14 can be reduced.

  In addition, although the light source device 2 of the illuminating device 1 of embodiment is provided with four types of light sources from which the color of the emitted light mutually differs, what is necessary is just to be provided with two types of light sources from which a color mutually differs. For example, the light source device 2 includes a plurality of first light sources that emit first light and a plurality of second light sources that emit second light having a shorter wavelength than the first light. At this time, the plurality of first light sources are arranged in both the inner region 22 and the outer region 23. The plurality of second light sources are not disposed in the outer region 23 but are disposed only in the inner region 22. Even when the plurality of light sources 18 are replaced with the plurality of first light sources and the plurality of second light sources, the illuminating device 1 has a width of a portion where light having a short wavelength is projected on the edge of the projection light 14. By reducing the size, the degree of color unevenness of the projection light 14 can be reduced.

  In addition, although the light source device 2 of the illuminating device 1 of the embodiment includes the COB type LED module 16, the light source device 2 may include an LED module having a different structure from the COB type. Examples of the LED module include a surface mount device (SMD) type LED module in which a plurality of LED chips arranged in a cavity formed of ceramic, resin, or the like are mounted on one substrate. Even in the case where such an LED module is applied, the lighting device 1 is provided with a plurality of light sources 18 so that a light source that emits light having a short wavelength is not arranged in the outer region 23, thereby reducing the degree of color unevenness. Can be reduced.

[Modification]
FIG. 4 is a plan view showing a light source device 40 according to a modification. The light source device 40 of the modification includes a plurality of light sources 41 as shown in FIG. 4 in the same manner as the light source device 2 described above. The region 42 where the plurality of light sources 41 are arranged is formed by an inner region 43, an intermediate region 44, and an outer region 45. The inner region 43 is disposed approximately at the center of the region 42 so as to intersect the optical axis 7 of the imaging lens 3. The intermediate region 44 is formed so as to surround the inner region 43. The outer region 45 is formed so as to surround the outer side of the intermediate region 44. That is, the region 42 is formed such that the intermediate region 44 is sandwiched between the inner region 43 and the outer region 45.

  The plurality of light sources 41 are formed of a plurality of white light sources, a plurality of red light sources, a plurality of green light sources, and a plurality of blue light sources in the same manner as the plurality of light sources 18 described above. At this time, the plurality of white light sources are not disposed in the outer region 45 and the intermediate region 44 but are disposed only in the inner region 43. The plurality of red light sources are arranged in all of the inner region 43, the intermediate region 44, and the outer region 45. The plurality of green light sources are not disposed in the outer region 45 but are disposed in both the inner region 43 and the intermediate region 44. The plurality of blue light sources are not disposed in the outer region 45 and the intermediate region 44 but are disposed only in the inner region 43.

  In the illumination device provided with such a light source device 40, a plurality of blue light sources are not arranged in the outer region 45 and the intermediate region 44. The width of the bluish part can be reduced. Green light has a longer wavelength than blue light and a shorter wavelength than red light. The green light causes color unevenness to appear at the edge of the projection light 14 due to the chromatic aberration of the imaging lens 3 in the same manner as the blue light. For this reason, such an illuminating device can further reduce color unevenness appearing at the edge of the projection light 14 by not arranging a plurality of green light sources in the outer region 45.

  In the present modification, the plurality of light sources 41 include a plurality of white light sources, but the plurality of white light sources may be omitted. Even if a plurality of white light sources are omitted, such an illuminating device does not arrange light sources of short wavelengths in the intermediate region 44 and the outer region 45, thereby causing color unevenness appearing at the edge of the projection light 14. Can be reduced.

  In this modification, the plurality of light sources 41 include a plurality of red light sources, a plurality of green light sources, and a plurality of blue light sources, but other color combinations may be used. Even in this case, the light source that emits the light having the shortest wavelength among the three types of light sources is not disposed in the intermediate region 44 and the outer region 45, and the light source that emits the light having the second shortest wavelength is the outer region 45. Not placed in. The illumination device can reduce unevenness in color that appears at the edge of the projection light 14 by arranging the three types of light sources in this way.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1: Illuminating device 2: Light source device 3: Imaging lens 5: Cutter device 7: Optical axis 8: Aperture part 11: Screen 12: Imaging surface 14: Projection light 16: LED module 17: Board | substrate 18: Multiple light sources 22 : Inner area 23: outer area 40: light source device 41: plural light sources 43: inner area 44: intermediate area 45: outer area

Claims (2)

A plurality of light sources mounted on a single substrate and respectively disposed at a plurality of different positions;
A cutter in which an opening is formed;
A lens that forms an image on the imaging plane of light that has passed through the opening among the light emitted from the plurality of light sources;
Comprising
The plurality of light sources are
A plurality of first light sources emitting first light;
A plurality of second light sources that emit second light having a shorter wavelength than the first light,
The region where the plurality of light sources are arranged is
A first region;
A second region surrounding the first region,
The plurality of first light sources are disposed in the first region and the second region,
The plurality of second light sources are not disposed in the second region, but are disposed in the first region. The plurality of first light sources includes:
A plurality of third light sources emitting third light;
A plurality of fourth light sources that emit fourth light having a shorter wavelength than the third light,
The second region is
A third region surrounding the first region;
A fourth region disposed between the first region and the third region so as to surround the first region inside the third region;
The plurality of third light sources are disposed in the third region and the fourth region,
The lighting device according to claim 1, wherein the plurality of fourth light sources are not disposed in the third region but are disposed in the fourth region.

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