JP3203727U - Lighting device - Google Patents

Abstract

An illumination device capable of changing an illumination color with a simple structure and simple operation as much as possible. A wavelength light guide plate is provided on a side surface of a circular light guide plate, and a light emitting diode group is arranged concentrically outside the circular light guide plate. By adjusting the rotation of 305, the illumination color is changed by changing the coverage of the wavelength conversion body group on the light emitting surface of the light emitting diode group 304. [Selection] Figure 3

Description

  The present invention relates to a light emitting diode and a lighting device realized by combining a phosphor having a property of being excited and emitting light.

  With the practical use of blue light emitting diodes in the 1990s, it has become possible to generate the three primary colors of light with light emitting diodes, and white light emitting diodes are rapidly spreading. Recently, only one color of blue light-emitting diode is used as a light source, and a method of generating pseudo white color by combining this with a yellow phosphor is advantageous in terms of manufacturing cost and miniaturization, and has become mainstream. Yes.

  When white light emitting diodes are used for illumination, it is common to change the color tone according to the purpose. For applications that need to faithfully represent each color, such as mobile phones and computer displays, the phosphor combined with the blue light-emitting diode has characteristics that can produce green, yellow, and red light-emitting components as uniformly as possible. Is selected. On the other hand, since warm white lighting is preferred for general home lighting, a phosphor with a relatively large amount of orange and red components is selected. In addition, for store lighting, there is a tendency to actively use white lighting with a lot of red components in red meat and fish departments, and white lighting with lots of blue and green ingredients in departments of vegetables and the like. .

  As described above, when the use of white illumination is determined, it is relatively easy to manufacture a white illumination device having light emission characteristics according to the purpose. However, when the application and purpose are not necessarily constant and are changed according to the situation, the combination of the light emitting diode and the phosphor cannot be fixed. For example, even general household lighting tends to prefer white with a strong blue component in summer and white with a strong red component in winter.

  Lighting devices that are distributed for general household use are also equipped with blue, green, and red light emitting diodes, and the color can be adjusted freely by changing their illuminance with a remote controller. Has also been put to practical use. However, in such a configuration, the number of light emitting diodes used is large and the control system is complicated, so that it is large and expensive.

  As a method for adjusting the color of illumination by a simpler method, there is a method of changing the relative positional relationship between the light emitting diode and the phosphor. For example, in Patent Document 1, in a planar illumination device in which a fluorescent film is arranged between a point light source and a light incident surface of a light guide plate, a region in which the phosphor characteristics continuously change is provided in the fluorescent film, The structure which changes illumination color by displacing point light sources, such as a light emitting diode, with respect to a fluorescent substance area is illustrated.

JP 2012-169120 A

  As shown in Patent Document 1, an apparatus that performs toning by changing the relative positional relationship between a phosphor and a light-emitting diode has a simple configuration, but which displacement is necessary for toning. There remains a problem of how to do this. Use of a drive system or communication system that requires electrical control for the toning operation does not provide an advantage over a device that electrically controls the three primary color light emitting diodes.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a lighting device that can perform color matching with a simple structure and operation method as much as possible in a lighting device using a light emitting diode. Is.

  As a result of studying to solve the above-mentioned object, a circular light guide plate is used, a wavelength converter group is installed on the side surface of the light guide plate, and a light emitting diode group is arranged concentrically outside the light guide plate. It has been found that the above object can be achieved by providing means for manually rotating the light plate.

This invention is made | formed based on this knowledge, and provides the illuminating device using the following light emitting diodes.
[1] A circular light guide plate in which a wavelength converter group is installed on a side surface and a light emitting diode group arranged concentrically outside the light guide plate, and means for manually rotating the light guide plate An illuminating device characterized in that the emission color can be changed.
[2] The illumination device according to [1], wherein the wavelength converter is a phosphor having a property of converting a part of a light emitting component of the light emitting diode group.
[3] The illumination device according to [1] or [2], wherein the wavelength converter includes a plurality of types of wavelength converters having different characteristics.
[4] The illumination device according to [1] or [2], wherein the wavelength converter is a wavelength converter whose characteristics continuously change.
[5] The lighting device according to any one of [1] to [4], wherein the means for rotating the light guide plate is a slidable knob protruding outward.

  The lighting device of the present invention can perform toning with a high degree of freedom by a very simple operation. In addition, since the lighting device of the present invention can be easily reduced in size and cost, the position and quantity of installation can be selected with a high degree of freedom, and a usage form optimized for the purpose is possible.

Overview of the lighting device in one embodiment of the present invention The figure which shows the light emission surface side of the illuminating device shown in FIG. Exploded view of the lighting device shown in FIG. Sectional drawing of the illuminating device shown in FIG. The figure which shows the change of the positional relationship of the fluorescent substance group and light emitting diode group of the illuminating device shown in FIG. The figure which shows the change of the positional relationship of the fluorescent substance group and light emitting diode group of the illuminating device in other embodiment of this invention.

  An illuminating device of the present invention has a circular light guide plate in which a wavelength conversion body group is installed on a side surface, and a light emitting diode group arranged concentrically outside the light guide plate, and manually rotates the light guide plate. It is characterized in that the emission color can be changed by providing means for causing the emission.

In the illuminating device of the present invention, a plurality of light emitting diode groups serving as illumination light sources are concentrically arranged, and their light emitting surfaces face the center direction. Further, a circular light guide plate is installed on the inner side, and on the side surface (light incident surface) of the light guide plate, a wavelength converter group such as a phosphor that converts a part of the wavelength of the light source component is connected to the light emitting diode group. Correspondingly arranged.
The arrangement of the wavelength conversion body group is not particularly limited as long as the colored light is changed by the rotation of the light guide plate described later, but for example, a plurality of wavelength conversion bodies are arranged discretely, Alternatively, a wavelength converter group formed of wavelength converters whose specification changes discontinuously or continuously is arranged.
The light guide plate can be manually rotated about its axis, and the wavelength distribution of light incident on the light guide plate, that is, the illumination color, changes as the relative position of the light emitting diode group and the wavelength converter group changes. .

In the present invention, the means for rotating the light guide plate is not particularly limited, but as an example, there is a knob for rotating the light guide plate.
The knob for rotating the light guide plate can be easily adjusted while viewing the illumination color by projecting to the outside of the illumination device and pinching with a finger from the outside. No electrical control is necessary for the rotation of the light guide plate, and the structure is simplified, and the lighting device can be easily downsized.

  A further advantage of the lighting device of the present invention is that not only two kinds of illumination colors but also intermediate colors thereof can be obtained continuously. That is, when the ratio of the phosphor group covering the light emitting surface of the light emitting diode group (coverage) is the maximum, the illumination color A is the illumination color B, and the case where the coverage is the minimum is the illumination color B, the rotation angle of the light guide plate is The illumination color between illumination color A and illumination color B can be easily obtained by arbitrarily adjusting and changing the coverage.

  As described above, it is common to obtain pseudo white light by combining a blue light-emitting diode and a yellow phosphor. Therefore, it is usual to select such a combination for the light source and phosphor in the lighting device of the present invention. However, in applications where you want to adjust the color by adding some red to white light, use a white light-emitting diode as the light source, and use a film that transmits a large amount of the red component instead of the phosphor for color adjustment. May be used.

  Hereinafter, embodiments of the lighting device of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiments.

FIG. 1 shows an overview of one embodiment of a lighting device of the present invention.
In the illuminating device of this embodiment, the light emitting surface 102 is arranged at the center of the housing 101, and the illumination color is changed by sliding the color adjustment knob 103. A switch for turning on or off the illumination, a cable for connecting to an external power source, and the like are not shown, but are provided as necessary.

  FIG. 2 shows the illumination device shown in FIG. 1 as viewed from the light emitting surface side. The light emitting surface 202 disposed in the center of the housing 201 can be rotated about the normal direction of the surface center as an axis, and when actually rotating, the toning knob 203 is gripped with a finger and rotated. Like that. As described above, the toning mechanism of the lighting device according to the present invention is based on changing the relative position of the phosphor group and the light emitting diode group arranged on the side surface of the circular light guide plate. It is sufficient that the coverage of the light emitting diode group by the group only changes between the maximum and minimum ranges. Therefore, the toning knob 203 is accommodated in a hole or notch 204 provided in a part of the housing 201 so that the movable range is limited.

  FIG. 3 is an exploded view of the lighting device described in FIGS. 1 and 2. The light source unit 301 is provided with a light guide plate accommodating portion 302 having a circularly recessed shape in the center of the light source unit 301, and a bearing hole 303 is formed in the center of the light source unit 301 for accommodating the rotation shaft of the light guide plate. Further, a light emitting diode group 304 is disposed on the inner peripheral surface of the light guide plate housing portion 302. Since the circular light guide plate 305 rotates around the rotation axis, it does not contact the light emitting diode group 304. A similar function can be realized even in a structure in which a protrusion is formed instead of the bearing hole 303 and a hole is formed on the circular light guide plate 305 side.

The light from the light emitting diode group 304 is designed to enter from the side surface (outer peripheral surface) of the circular light guide plate 305 and to be emitted uniformly from the surface (circular surface). Such a light guide plate is already on the market and does not require any new technology. However, in the illumination device of this embodiment, the phosphor groups 306 are discretely arranged on the side surfaces of the circular light guide plate 305. It is a feature.
A rotating shaft is provided on the back surface of the circular light guide plate 305, and the rotating shaft is accommodated in the light source unit 301 so as to be received in the bearing hole 303. In the illuminating device of the present embodiment, the toning is performed by changing the coverage of the light emitting diode group 304 by the phosphor group 306 by rotation. Is provided.
Note that, as described above, the phosphor group 306 is intended to perform color adjustment by converting the wavelength of part of the light emitted from the light emitting diode group 304. Therefore, a phosphor film is used instead of a phosphor. The purpose may be achieved by arranging or applying paint.

A light diffusing plate 308 is installed on the light emitting surface of the circular light guide plate 305 as needed to make light emission more uniform. Since there is the toning knob 307, a knob hole 309 is formed in the light diffusion plate 308. Further, the housing cover 310 is covered from the upper side to form a lighting device. The center of the housing cover 310 has a large opening so that illumination light can pass through. A hole or notch 311 for limiting the movable range of the toning knob 307 is provided in a part of the housing cover 310. Yes.
The light diffusing plate 308 and the circular light guide plate 305 are integrated by bonding or screwing, and the light diffusing plate 308 has a diameter close to the inner diameter of the housing cover 310 so that the movable range is limited. In this case, since the movable range of the circular light guide plate 305 is also limited, the rotating shaft and the bearing hole 303 need not be provided. Specifically, if the difference between the inner diameter of the housing cover 310 and the radius of the light diffusion plate 308 is smaller than the difference between the light emitting surface of the light emitting diode group 304 and the surface of the phosphor group 306, the light emitting diode group. Since there is no possibility that the light emitting surface 304 and the surface of the phosphor group 306 are damaged by contact, the rotating shaft and the bearing hole 303 are not necessary.

  FIG. 4 is a cross-sectional view of the illumination device of the present embodiment. A bearing hole 402 is provided in the center of the light source unit 401. In addition, the light emitting diode group 403 is concentrically arranged, and the light emitting surface is directed to the side surface direction of the circular light guide plate 404 accommodated in the center. A rotation shaft 405 is provided in the center of the back surface of the circular light guide plate 404, and the circular light guide plate 404 can be rotated by fitting in the bearing hole 402 of the light source unit 401. The reflecting plate 406 is for increasing the amount of light emitted from the light emitting surface, but it is not necessary to lay it if the reflectance of the inner surface of the light source unit 401 is sufficiently high. On the side surface of the circular light guide plate 404, phosphor groups 407 are arranged discretely or non-uniformly. In FIG. 4, since the phosphor group 407 is located in front of the light emitting diode group 403, the illumination color is the most discolored by the phosphor. When the circular light guide plate 404 is rotated by sliding the toning knob 408, the coverage of the light emitting diode group 403 by the phosphor group 407 changes, so that the illumination color also changes. The light diffusion plate 409 is for making the illumination more uniform, and is used as necessary. Further, a casing cover 410 is covered from above to form a lighting device.

FIG. 5 shows a change in the positional relationship between the phosphor group and the light-emitting diode group in the illumination device shown in FIGS.
In FIG. 5A, since the coverage of the phosphor group 502 is at the maximum with respect to the light emitting surface of the light emitting diode group 501, the illumination most converted from the original emission wavelength distribution of the light emitting diode group 501. Become a color. From this state, the toning knob 503 is slid to change the positional relationship as shown in FIG. In this state, since the coverage of the phosphor group 505 is at a minimum with respect to the light emitting surface of the light emitting diode group 504, the illumination color closest to the original emission wavelength distribution of the light emitting diode group 501 is obtained.

FIG. 6 shows the arrangement of phosphor groups and light emitting diode groups in another embodiment.
When a blue light emitting diode is used as the light emitting diode group and a yellow phosphor is used as the phosphor group to generate a pseudo white color, the light of the light emitting diode group is almost directly illuminated as shown in FIG. 5B. Therefore, it becomes blue illumination light. Practically, there are many cases where it is desired to perform toning between a plurality of types of white light with different color tones, and thus the object cannot be achieved with such a configuration.

Therefore, in the illumination device of the embodiment shown in FIG. 6, the object is achieved by using a phosphor group formed of a plurality of types of phosphors having different characteristics.
In FIG. 6A, for example, blue light emitting diodes are used as the light emitting diode group 601. Furthermore, since the phosphor group A602 and the phosphor group B603 are both yellow phosphors but have different characteristics, they generate different white light when irradiated with a blue light emitting diode. Since the phosphor group A602 and the phosphor group B603 are alternately arranged to cover the side surface of the light guide plate, the blue light of the light emitting diode group 601 does not pass through as it is, and the illumination color does not become blue. In FIG. 6A, since the coverage by the phosphor group A602 is the maximum with respect to the light emitting diode group 601, the illumination color is white light generated by the phosphor group A602. When the toning knob is slid from this state to the state of FIG. 6B, the coverage by the phosphor group B604 is maximized, so the illumination color is white light generated by the phosphor group B604. In these intermediate states, the illumination color is also an intermediate color corresponding to the coverage.
In the embodiment shown in FIG. 6, two types of phosphors having different characteristics are used. Needless to say, three or more types of phosphors having different characteristics can be used.

Further, although not shown in the figure, another embodiment is also possible in which a phosphor having a concentration distribution is used instead of a plurality of types of phosphors having different characteristics in the embodiment shown in FIG.
Similarly to the embodiment shown in FIGS. 5 and 6, also in this embodiment using a phosphor having a concentration distribution, the position of the phosphor group can be changed by sliding the position of the toning knob. By changing from the position where the coverage of the phosphor group is minimized to the position where the phosphor group is covered with respect to the light emitting surface, from the illumination color closest to the original emission wavelength distribution of the light emitting diode group to the illumination color that has undergone the most conversion It can be changed freely.

DESCRIPTION OF SYMBOLS 101 Case 102 Light emission surface 103 Toning knob 201 Case 202 Light emission surface 203 Toning knob 204 Notch 301 Light source unit 302 Light guide plate accommodating part 303 Bearing hole 304 Light emitting diode group 305 Circular light guide plate 306 Phosphor group 307 Toning knob 308 Light diffusing plate 309 Knob hole 310 Housing cover 311 Notch 401 Light source unit 402 Bearing hole 403 Light emitting diode group 404 Circular light guide plate 405 Rotating shaft 406 Reflecting plate 407 Phosphor group 408 Toning knob 409 Light diffusing plate 410 Housing cover 501 Light emitting diode group 502 Phosphor group 503 Toning knob 504 Light emitting diode group 505 Phosphor group 601 Light emitting diode group 602 Phosphor group A
603 Phosphor group B
604 phosphor group B

Claims (5)

  A circular light guide plate having a wavelength conversion body group installed on the side surface and a light emitting diode group arranged concentrically on the outside of the light guide plate, and provided with means for manually rotating the light guide plate to emit light A lighting device characterized in that it can be changed.   The illumination device according to claim 1, wherein the wavelength converter is a phosphor having a property of converting a part of a light emitting component of the light emitting diode group.   The illuminating device according to claim 1 or 2, wherein the wavelength converter includes a plurality of types of wavelength converters having different characteristics.   The illumination device according to claim 1, wherein the wavelength converter is a wavelength converter whose characteristics continuously change.   The lighting device according to any one of claims 1 to 4, wherein the means for rotating the light guide plate is a slidable knob protruding outward.

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