JP3194822U - Lighting device - Google Patents

Abstract

Provided is an illumination device capable of easily changing a color temperature and a hue which are excited and emitted by laser light. A light emitting region 21 including a first region and a second region, which are adjacent first regions and second regions, which emit light excited by laser light 5 to output light 7 of different colors. The light emitting unit 20, the irradiation unit 30 that irradiates the light emitting region 21 with the laser beam 5 to form the spot 6, the state of the spot 6, and the first state in which the spot 6 is formed in the first region Provided is a lighting device 1 having a color selection unit 40 that fixes a spot 6 in a second state in which a spot 6 is formed across a first region and a second region. [Selection] Figure 2

Description

  The present invention relates to an illumination device capable of changing the color temperature and hue of light excited and emitted by laser light.

  Patent Document 1 describes providing a lighting device and a lighting fixture that can vary a color temperature using a semiconductor light emitting element as a light source. The illumination device of Patent Document 1 includes a semiconductor light emitting element, a light source body that houses the semiconductor light emitting element and has a light transmitting portion, a base member for supplying power to the semiconductor light emitting element, and a color of the semiconductor light emitting element from daylight to light bulb color. And control means for varying the temperature.

JP 2007-59260 A

  There is a demand for a low-cost illumination device that can easily select or change the color temperature and hue of light excited and emitted by laser light.

  One embodiment of the present invention includes a first region and a second region that are adjacent to each other, and a light-emitting region including a first region and a second region that emits light of different colors when excited by laser light. A light emitting unit, a light emitting unit that irradiates a laser beam to the light emitting region to form a spot, a spot state, a first state in which the spot is formed in the first region, and a spot that is the first It is an illuminating device which has a color selection unit fixed to the 2nd state formed ranging over a field and the 2nd field.

  The light emitting unit of this apparatus is arranged so that the first region and the second region that output different colors are formed across the spots. Therefore, if the color selection unit is formed so that the spot of the laser beam does not straddle these regions, illumination is performed so that the light of the controlled color is output to the first region or the second region. You can set the device. In addition, if the spot is formed so as to straddle the first region and the second region, the lighting device is configured so that light of a controlled color is output to the first region and the second region. Can be set. Further, when the color selection unit is formed across the spots, the illumination device is configured so that light having different color temperature and hue is output by changing a ratio included in the first region and the second region. Can be fixed (set). Therefore, an illumination device that can be set to output light of different colors by a simple method can be realized with a simple structure, and can be provided at low cost.

The perspective view which shows the whole structure of an illuminating device. Sectional drawing which shows schematic structure of an illuminating device. FIGS. 3A to 3D are diagrams showing examples in which spots are formed in each region. Sectional drawing which shows schematic structure of a different illuminating device. FIGS. 5A to 5C are diagrams showing examples in which spots are formed in each region. FIGS. 6A to 6C are diagrams showing examples in which spots are formed in respective regions with different sizes. Furthermore, the figure which shows the structure of another illuminating device.

  In recent years, in place of filament light bulbs and fluorescent lamps, there are an increasing number of luminaires and lighting devices that use light-emitting diodes with low power consumption and long life. Many lighting devices using light emitting diodes as light sources have a single color. For this reason, in order to change the atmosphere in the store or indoors, the lamp body must be replaced. Since the light emitting diode is small, it is easy to provide a lamp whose emission color can be changed by arranging light emitting diodes having a plurality of color temperatures and hues in the lamp. However, when the number of light emitting diodes is increased as the light source, the cost of the lamp is greatly increased. In recent years, light-emitting diode illumination has become widespread in ordinary households, and there is a demand for inexpensive and easy-to-operate lamps that can change color and brightness.

  FIG. 1 is a perspective view showing the overall configuration of the lighting device, and FIG. 2 is a cross-sectional view showing the schematic configuration of the lighting device 1. An illumination device (variable color temperature illumination device, color conversion illumination device) 1 includes an output unit 3 that outputs light (illumination light) 7 that illuminates a room and the like, and the output unit 3 is fixed to a support member 2 such as a ceiling or a wall surface. And the base 10 to be included. The base portion 10 includes a housing (cover) 11 and an attachment portion 12 that fixes the housing 11 to the support member 2 with bolts or the like. The base 10 may be attached to a rosette. An irradiation unit 30 that outputs laser light 5 is housed in the housing 11 of the base 10.

  The irradiation unit 30 includes a semiconductor light emitting element (laser element, light source) 31 that emits laser light 5, a lens unit 32 that changes the shape of the spot 6 of the laser light 5 emitted from the semiconductor light emitting element 31, and a semiconductor light emitting element. A substrate 34 for driving 31 and a heat radiating member (supporting member) 33 for radiating heat generated by the semiconductor light emitting element 31 are included. A semiconductor laser element can be used for the semiconductor light emitting element 31. The lens unit 32 can be a collimating lens, a diffraction grating, or the like. Although the lens unit 32 may not be used, the shape and area of the spot 6 formed on the light emitting unit 20 can be easily changed by using the lens unit 32. The lens unit 32 may include a function of changing the focus of the spot 6 formed on the light emitting unit 20. The heat dissipating member 33 can be formed of a metal member having good heat conduction, such as aluminum, in order to firmly fix the semiconductor light emitting element 31 and efficiently dissipate heat generated from the semiconductor light emitting element 31. In order to increase the cooling efficiency, an air cooling fan or the like may be housed in the housing 11.

  The output unit 3 includes a spherical cover 4, and a light emitting unit 20 serving as a light source is accommodated therein. The light emitting unit 20 has a disk-like light emitting body 25 in which a light emitting region 21 in which a plurality of types of phosphors that emit light of different colors is excited and emitted by the laser light 5 output from the laser light source 31 is formed on the upper surface 23. including. The light emitter 25 is made of a metal having good heat dissipation characteristics, such as aluminum, so that it can withstand the laser light 5 emitted from the irradiation unit 30. The cover 4 is transparent or translucent, and may be a milky white member having a light diffusion capability, or may be processed into a rough surface or may include a light diffusion member or material inside. Good. The cover 4 is attached to the base 10 so as to rotate around the central axis 8, and a light emitter 25 is attached to the tip of the cover 4 so as to rotate around the central axis 8 in synchronization with the cover 4. ing.

  3A to 3D show a state in which the upper surface 23 of the light emitter 25 of the light emitting unit 20 is set at a different angle (rotation angle) by rotating the cover 4. The circular light emitting region 21 provided on the upper surface 23 of the light emitter 25 of the light emitting unit 20 is divided into four around the central axis 8, and the first region 51, the second region 52, the third region 53, and the first region 53. Four regions 54 are formed. Each region 51 to 54 is coated with a plurality of types of phosphors that excite and emit light of different colors by the laser beam 5. Therefore, in the light emitting unit 20, the first region 51, the second region 52, the third region 53, and the fourth region 54 that emit light excited by the laser light 5 and output the light 7 of different colors are in the circumferential direction. (In the periphery, around the center 8) in turn, adjacent light emitting regions 21 are included. The number of regions arranged in the light emitting region 21 may be three or less, or may be five or more. The shape of the light emitter 25 may be a conical shape, an elliptical shape, a spherical shape or the like, a polygonal shape such as a quadrangle, or a solid shape.

  The type of phosphor applied to each region of the light emitting region 21 of the light emitting unit 20 is not limited. For example, the first region 51 is coated with a first phosphor that outputs red fluorescence. The second region 52 is coated with a second phosphor that outputs green fluorescence, the third region 53 is coated with a third phosphor that outputs blue fluorescence, and the fourth region 54 is coated with a second phosphor. A fourth phosphor that outputs white fluorescence is applied.

  The semiconductor light emitting element 31 of the irradiation unit 30 that forms the spot 6 in the light emitting region 21 is attached at a position shifted (eccentric) from the central axis 8. Therefore, the spot 6 is formed at an eccentric position shifted from the central axis 8 of the light emitting region 21, and the light emitting region 21 is divided by rotating the cover 4 around the central axis 8 by hand or a simple mechanism. The spots 6 of the laser beam 5 are formed in different areas of the areas 51 to 54. For this reason, the illumination light 7 having a different color temperature or hue is output from the light emitting unit 20 by turning the cover 4. The illuminating device 1 can change the color temperature and hue of the illuminating light 7 output through the cover 4 by rotating the cover 4 that is an outline of the illuminating device 1, and can set the illuminating light 7 of different colors. For this reason, the illuminating device 1 is an illuminating device which can use the cover 4 as the color selection unit 40, and can change the illumination light 7 according to liking etc. The lighting device 1 can be used as a spotlight, a base light, a street light, etc., in addition to a ceiling light attached to a ceiling or the like.

  FIG. 3A shows a first state S 1 in which the spot 6 is formed in the first region 51 of the light emitting region 21. Since the spot 6 of the laser beam 5 is formed in the first region 51, the first phosphor applied to the first region 51 is excited to emit light, and the red illumination light 7 is output.

  FIG. 3B shows that the cover 4 rotates the light emitter 25 in the clockwise direction 9 in the drawing so that the spot 6 straddles the first region 51 and the second region 52 adjacent to the first region 51. 2 shows the second state formed. Since a part of the spot 6 is applied to the second region 52, the second phosphor that outputs green fluorescence applied to the second region 52 emits excitation light, and orange light in which green is mixed with red is emitted as illumination light. 7 is output.

  FIG. 3C shows a state in which the ratio of the first area 51 and the second area 52 occupied by the spot 6 is changed to 1: 1 by further rotating the light emitter 25 by the cover 4. Since the spot 6 is equally allocated to the first area 51 and the second area 52, yellow light in which red and green are mixed is output as illumination light 7.

  FIG. 3D shows a first state S <b> 1 in which the light emitter 25 further rotates and the spot 6 is formed in the second region 52. Since the spot 6 is formed in the second region 52, the second phosphor that outputs green fluorescence applied to the second region 52 emits and emits light, and green light is output as the illumination light 7.

  When the light emitter 25 is further rotated by the cover 4 that also serves as the color selection unit 40, the spot 6 moves in the order of the second region 52, the third region 53, the fourth region 54, and the first region 51. By this operation, it is possible to select and output illumination light 7 such as light blue, blue, and white from the illumination device 1. In addition, since the area of each region occupied by the spot 6 slightly changes depending on the position (angle) at which the rotation of the light emitter 25 is stopped, the color ratio of the excitation light emitted from the phosphor slightly changes to express various colors. The color temperature and hue output from the lighting device 1 can be changed (dimmed) steplessly. Therefore, the illuminating device 1 which can change color temperature and hue from a light bulb color to white light can be provided. Further, instead of changing the color (type) of the phosphor applied to the light emitting region, the brightness of the light 7 emitted from the lighting device 1 is changed by applying phosphors having different excitation light emission conversion efficiencies. You can also. Furthermore, by replacing the light emitter 25, the types of illumination light 7 output from the illumination device 1 can be set to almost infinite.

  As described above, the illuminating device 1 includes a plurality of adjacent regions, for example, a first region and a second region, and the first region and the second region that emit light of different colors by being excited by the laser light. The light emitting unit 20 including the light emitting region 21 including the region, the irradiation unit 30 that irradiates the light emitting region 21 with the laser beam 5 to form the spot 6, and the state of the spot 6, where the spot 6 is the first light emitting region 21. A color selection unit 40 that fixes the first state S1 formed in the region and the second state S2 in which the spot 6 is formed across the first region and the second region of the light emitting region 21; Have

  In the illuminating device 1 described above, the cover 4 is rotated to select a color, but instead of the cover 4, the base 10 is rotated as the color selection unit 40 and the spots 6 formed in the light emitting region 21 are rotated. The position may be changed. The cover 4 and the base 10 may be used as the color selection unit 40. The color selection unit 40 only needs to change the relative position of the spot 6 in the light emitting region 21, and may have other optical elements such as a prism and a mirror.

  The shape of the spot 6 may be a circle instead of an ellipse. However, it is desirable that the shape of the spot 6 is long in the direction (first direction) adjacent to the divided areas 51 to 54 of the light emitting area 21 like an ellipse. The length L along the circumferential direction of the spot 6 may be longer than the length along the circumferential direction in each region of the light emitting region 21, but a spot having a length that fits in each region is formed. Thus, the light emitted by the phosphors applied to the respective regions can be output alone.

  The ratio of the length L along the circumferential direction of the spot 6 to the length (width) W along the radial direction is preferably 1.1: 1 to 50: 1, and 1.5: More preferably, it is 1 to 20: 1, and more preferably 2: 1 to 10: 1. The shape of the spot 6 is not limited to an ellipse, and may be curved along the edge of the disk-shaped light emitter 25 as long as it is a vertically long shape. The curved spot can be formed by including in the lens unit 32 a lenticular lens bent (curved) along the circumference. By making the shape of the spot 6 a shape extending in the circumferential direction where different phosphors are applied adjacently, the color temperature and hue can be controlled more delicately.

  The embodiment of the illuminating device 1 is characterized in that it includes a semiconductor light emitting element 31 and a phosphor that performs color conversion. According to the embodiment of the present invention, the laser light 5 emitted from the semiconductor light emitting element 31 can be converted into illumination light 7 of various colors. In the illuminating device 1, the state of the spot 6 formed on the light emitting unit 20 can be adjusted steplessly by actually watching the hue (color temperature) by the color selection unit 40. For this reason, the color temperature, the hue, and the brightness can be easily changed by utilizing the difference in the excitation wavelength and the conversion efficiency of the phosphor applied to the light emitting unit 20. Furthermore, this configuration can provide an inexpensive lighting device 1 with a very small number of components. In addition, the color can be switched by a simple operation because the color selection unit 40 only changes the position of the phosphor received.

  In the lighting device 1, the light emitter 25 of the light emitting unit 20 is attached to the tip 4 a of the spherical cover 4 that is rotatably attached to the base 10. The shape of the cover 4 is a pear type or a columnar shape. The cross-sectional shape may be a circle, a polygon, or the like. The cover 4 forms an outline of the lighting device 1 and covers the entire side surface or the like, or may form a gap through which the illumination light 7 is transmitted, such as an angle, a frame, or a mesh. . The attachment method of the base 10 and the cover 4 may be various, and the cover 4 may be rotatably incorporated in the rising portion 13 of the base 10 or other rotatable attachment structures may be employed. The cover 4 may be manually rotated, or may be remotely rotated by a motor or the like to fix the movement of the cover 4 at a desired angle or position.

  FIG. 4 is a cross-sectional view illustrating a schematic configuration of a different lighting device 1a. The illumination device 1a includes a light emitting unit 20 including a plate-like light emitter 25 that is long in a first direction X. In the lighting device 1 described above, the light emitting unit 20 includes a disk-shaped light emitter 25 and includes a plurality of first regions 51 and second regions 52 in the circumferential direction (circumferential direction of the first circle). The irradiation unit 30 forms the spot 6 at a position eccentric with respect to the center of the light emitter 25 (the center of the first circle). On the other hand, in the illuminating device 1a shown below, a plurality of regions are arranged in the longitudinal direction, and the illumination light 7 having different colors is output by sliding in the longitudinal direction. Further, in the lighting device 1 described above, the spot 6 having a fixed shape is formed. However, in the following lighting device 1a, the color selection unit 40 further changes the area and shape of the spot 6 by changing at least one of the areas. The color of the illumination light 7 can be selected flexibly.

  FIG. 5 shows the light emitting region 21 of the light emitter 25. The light emitter 25 includes a rectangular light emitting region 21, and the lighting device 1 a includes a support member 24 that supports the light emitter 25 to slide in the longitudinal direction (first direction, X direction) on the tip 4 a of the cover 4. . Therefore, the support member 24 functions as the color selection unit 40.

  The light emitting region 21 includes a first region 51, a second region 52, a third region 53, and a fourth region 54 that are arranged adjacent to each other in the first direction X. The semiconductor light emitting element 31 of the irradiation unit 30 is disposed on the central axis 8 of the illumination device 1a, and the lens unit 32 is long along the first direction X, but shorter than the lengths of the regions 51 to 54. Spot 6 is formed.

  FIG. 5A shows the first state S1 in which the spot 6 is formed in the first region 51, and the red light 7 is output. FIG. 5B shows a second state S <b> 2 in which the light emitter 25 is slid by the support member 24 and the spot 6 is formed to straddle the first region 51 and the second region 52. In FIG. 5B, orange illumination light 7 is output. FIG. 5C shows a first state S <b> 1 in which the light emitter 25 is further slid by the support member 24 and the spot 6 is formed in the second region 52. In FIG. 5C, green illumination light 7 is output.

  Similarly, by sliding the light emitting unit 20 along the first direction X, it is possible to output the illumination light 7 of a favorite color (color temperature) as in the illumination device 1.

  The illumination unit 30 of the illumination device 1a includes a spot adjustment unit 39 that controls the size of the spot 6 by moving the lens unit 32 back and forth with the central axis 8 as the optical axis. The spot adjustment unit 39 includes a function as a color selection unit 40 that changes the color of the illumination light 7 output from the light emitting region 21 by changing the size of the spot 6 formed in the light emitting region 21.

  FIG. 6 shows how the color of the illumination light 7 is changed by changing the size of the spot 6 formed in the light emitting region 21 of the light emitting unit 20. FIG. 6A shows the first state S 1 in which the spot 6 is formed in the third region 53. In FIG. 6A, blue illumination light 7 is output by the blue phosphor applied to the third region 53. FIG. 6B shows a second state S2 in which the size of the spot 6 is enlarged so that the spot 6 straddles the second region 52, the third region 53, and the fourth region 54. ing. In FIG. 6B, greenish pale white illumination light 7 is output. FIG. 6C shows a second state S2 in which the light emitter 25 is moved in the first direction X by the support member 24 from the state of FIG. ing. In FIG. 6C, since the center of the spot 6 is on the green phosphor, greenish white illumination light 7 is output.

  FIG. 7 shows still another illumination device 1b. The light emitting unit 20 of the illumination device 1b includes a light emitter 25 in which a light emitting region 21 including a first region 51, a second region 52, and a third region 53 arranged concentrically is formed. The irradiation unit 30 includes a lens unit 32 that forms the spot 6 in a ring shape in the light emitting region 21. Furthermore, the illuminating device 1b includes a color selection unit 40 that controls the relative distance between the light emitter 25 and the lens unit 32 and changes the diameter of the spot 6 formed in the light emitting region 21 to select a color.

  In this illuminating device 1b, by controlling the distance between the lens unit 32 and the light emitter 25 by the color selection unit 40, the first state S1 in which the ring-shaped spot 6 is formed in the first region 51; The spot 6 can be fixed to the second state S2 formed so as to straddle the first region 51 and the second region 52, respectively. Instead of changing the distance between the lens unit 32 and the light emitter 25, the lens unit 32 shifts the focus of the spot 6 to change the diameter (width) of the spot 6 so that illumination light 7 of a different color is output. Good.

  The third region 53 to which the blue phosphor used in the lighting devices 1, 1 a, and 1 b is applied does not need to be coated with a blue light source, for example, a light reflection layer or a light diffusion layer. It can be replaced by a region provided with a layer.

  Moreover, the light source used for these illuminating devices 1, 1a, 1b can obtain desired fluorescence from each phosphor by emitting at least blue light or emitting light having a shorter wavelength than blue light. In addition, although the lighting devices 1, 1a, and 1b are exemplified by laser elements, they can be replaced as long as they have high directivity.

  As described above, these lighting devices 1, 1 a and 1 b form a plurality of regions which are excited by the laser beam 5 and output different colors of light 7 in order or adjacent to each other, The illumination light 7 of various colors can be stably output by forming the spot 6 of the laser beam 5 so as to be limited to one or a plurality of those regions. The lighting device is suitable for many applications, and can be applied not only to lighting inside buildings and street lamps but also to lighting of various scenes.

DESCRIPTION OF SYMBOLS 1, 1a, 1b Illuminating device 20 Light emission unit, 21 Light emission area | region 30 Irradiation unit 40 Color selection unit 51 1st area | region, 52 2nd area | region, 53 3rd area | region, 54 4th area | region

Claims (6)

A light emitting unit having a light emitting region including a first region and a second region, which are adjacent to each other, the first region and the second region, which are excited and emitted by laser light to output light of different colors;
An irradiation unit that irradiates the light emitting region with the laser light to form a spot;
The spot state includes a first state in which the spot is formed in the first region, and a second state in which the spot is formed across the first region and the second region. And a color selection unit fixed to the lighting device. In claim 1,
The lighting device, wherein the color selection unit changes a relative position of the spot in the light emitting area. In claim 1 or 2,
The illuminating device, wherein the color selection unit changes at least one of an area and a shape of the spot. In any of claims 1 to 3,
The light emitting unit includes the first region and the second region disposed in a circumferential direction of a first circle,
The illumination unit forms the spot at a position eccentric with respect to a center of the first circle. In any of claims 1 to 4,
The light emitting unit includes the first region and the second region arranged to be adjacent to each other in a first direction,
The illumination unit is a lighting device that forms a long spot in the first direction. In any of claims 1 to 3,
The light emitting unit includes the first region and the second region arranged concentrically,
The illumination unit is an illumination device that forms the ring-shaped spot.

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