JP2013235739A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of suppressing color irregularities, in one having white LED light sources arranged in which blue LED elements are eccentrically arranged.SOLUTION: A lighting device 10 is provided with a plurality of white LED light sources 11 including an LED group LG which has one or more blue LED elements 21, a yellow phosphor 23, and a housing portion 22 for housing the LED group LG. The blue LED elements 21 are eccentrically arranged in the housing portion 22 and an arrangement center P1 of the LED group LG is arranged so as to be shifted from a central position P0 of the housing portion 22. At least one of the plurality of arranged white LED light sources 11 is arranged to have an arrangement center P1 of the LED group LG reversed, as compared with the other white LED light sources 11.

Description

  The present invention relates to a lighting device.

  Conventionally, an illuminating device including a white LED light source having a blue LED element and a yellow phosphor has been proposed.

  By the way, in the illuminating device provided with the white LED light source as described above, as shown in FIGS. 4 (a) and 4 (b), one in the accommodating portion 22 that accommodates the blue LED element 21 constituting the white LED light source 11. The arrangement center P1 of the LED group LG composed of the above blue LED elements may be shifted from the center position P0 of the housing portion 22. This is because, for example, a member (for example, a Zener diode) other than the blue LED element 21 is accommodated in the accommodating portion 22 in terms of cost and the like.

  Here, the color characteristics of the white LED light source 11 having the above-described configuration are shown in FIGS. 5 (a) and 5 (b). FIG. 5A shows the relationship between the direction of light from the white LED light source 11 and the color temperature in that direction. FIG. 5B shows the relationship between the direction of light from the white LED light source 11 and the chromaticities x and y in the CIE 1931 color system in that direction. As can be seen from the areas Ar1 and Ar2 in FIGS. 5A and 5B, when the white LED light source having the above configuration is separated from the blue LED element 21 (LED group LG), as shown in FIG. 4B. In addition, it becomes white light with strong yellowishness, resulting in uneven color. In addition, in FIG.4 (b), the thickness of a line represents the strength of yellowishness.

  The present invention has been made in order to solve the above-described problems, and the object thereof is to suppress uneven color in an illuminating device in which white LED light sources in which blue LED elements are biased are arranged. The object is to provide a lighting device.

  In order to solve the above-described problems, an illumination device according to the present invention includes a white LED light source including an LED group including one or more blue LED elements, a phosphor, and a storage unit that stores the LED group. A plurality of white LED light sources are arranged in the housing portion so that the center of the LED group is displaced from the center of the housing portion, and the plurality of white LED light sources are arranged in a row. Compared with other white LED light sources, the LED group is arranged so that the arrangement center of the LED group is inverted.

In the above configuration, it is preferable that the plurality of white LED light sources are arranged so that the arrangement center of the LED group is inverted at predetermined intervals.
In the above configuration, the plurality of white LED light sources are preferably arranged so that the arrangement center of the LED group is inverted for each one.

  Further, in the above configuration, a condensing lens is provided in an irradiation direction of the plurality of white LED light sources, and the plurality of white LED light sources are disposed such that an arrangement center of the LED group coincides with a design center of the condensing lens. It is preferable.

Moreover, the said structure WHEREIN: It is preferable that these white LED light sources are arrange | positioned so that the center position of the said accommodating part may align in a linear form.
Moreover, the said structure WHEREIN: It is preferable to provide a diffusion panel in the irradiation direction of these white LED light sources.

  Moreover, the said structure WHEREIN: It is preferable to provide a condensing lens in the irradiation direction of these white LED light sources, and for the said condensing lens, the light-projection surface is light-diffused.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can suppress the color nonuniformity in the illuminating device which arranges the white LED light source in which a blue LED element is biased and arranged can be provided.

(A)-(c) is a schematic block diagram of the illuminating device in embodiment. (A)-(c) is a schematic block diagram of the illuminating device in another example. (A) (b) is a schematic block diagram of the illuminating device in another example. (A) (b) is a schematic block diagram of the illuminating device in a comparative example. (A) (b) is a characteristic view for demonstrating the color nonuniformity of the illuminating device in the same as the above.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As illustrated in FIGS. 1A to 1C, the illumination device 10 according to the present embodiment includes a plurality of white LED light sources 11, a condenser lens 12, and a diffusion panel 13.

  As shown in FIGS. 1A to 1C, the white LED light source 11 includes a plurality of blue LED elements 21, a substantially bottomed cylindrical accommodating part 22 that accommodates the blue LED elements 21, and the accommodating part. And 22 yellow LED elements 21 provided on the emission surface side. The plurality of blue LED elements 21 accommodated in the accommodating portion 22 constitute an LED group LG.

The LED group LG is arranged with its arrangement center P1 biased to a position shifted from the center position P0 of the housing portion 22.
The condenser lens 12 has a bowl shape, and is provided in a straight line at substantially equal intervals corresponding to each white LED light source 11. The condensing lens 12 is for efficiently guiding the light emitted from the white LED light source 11 to the diffusion panel 13 side.

The diffusion panel 13 is configured by dispersing a light diffusion material (particles based on titanium oxide, calcium carbonate, or the like) in a transparent resin such as acrylic or polycarbonate.
As shown in FIG. 1A, the white LED light sources 11 configured as described above are arranged so that the arrangement center P1 of the LED group LG is inverted for each one. Further, the white LED light source 11 is arranged such that the central position P0 of the housing portion 22 that houses the LED group LG is arranged in a straight line.

Next, an effect | action (example of operation | movement) of the illuminating device comprised as mentioned above is demonstrated.
In the illumination device 10, each white LED light source 11 is turned on by supply from a power source (not shown). At this time, for example, as shown in FIG. 1B, the LED group LG is biased and arranged on one side (right side in the drawing) in the housing portion 22. Further, for example, as illustrated in FIG. 1C, the LED group LG is biased and arranged on the other side (left side in the drawing) in the housing portion 22. For this reason, for example, the white LED light source 11 in which the LED group LG is arranged on one side of the housing portion 22 is irradiated with weak yellowish white light from the LED group LG side, and from the opposite side (left side in the figure) of the LED group LG. A strong yellowish white light is emitted. Further, for example, the white LED light source 11 in which the LED group LG is arranged on the other side of the housing portion 22 is irradiated with white light having a weak yellowishness from the LED group LG side, and yellow from the opposite side (right side in the figure) of the LED group LG. A strong white light is emitted.

  And since the white LED light source 11 is arrange | positioned so that the arrangement | positioning center P1 of LED group LG may be reversed for every one, the white LED light source 11 arrange | positioned at linear form is yellowish when it sees the whole. A strong white light and a weak yellowish white light will be mixed. Thereby, in the diffusion panel 13, color unevenness can be suppressed. In the present embodiment, color unevenness can be further suppressed by the light diffusing material inside the diffusion panel 13.

  Further, since the arrangement center P1 of the LED group LG is reversed for each white LED light source 11, even when the arrangement interval is extremely wide, the irradiation area of a certain white LED light source 11 and the white LED light source 11 As the irradiation areas of the white LED light sources 11 adjacent to each other overlap, color unevenness can be reliably suppressed.

Next, characteristic effects of the present embodiment will be described.
(1) The illuminating device 10 includes a plurality of white LED light sources 11 each having an LED group LG including one or more blue LED elements 21, a yellow phosphor 23, and an accommodating portion 22 that accommodates the LED group LG. Prepare. In the housing part 22, the blue LED elements 21 are arranged in a biased manner so that the placement center P <b> 1 of the LED group LG is shifted from the central position P <b> 0 of the housing part 22. The plurality of white LED light sources 11 are arranged such that at least one of the arranged white LED light sources 11 is inverted with respect to the arrangement center P1 of the LED group LG as compared with the other white LED light sources 11. By adopting such a configuration, it is possible to prevent the LED group LG from being biased in one direction when the plurality of white LED light sources 11 are viewed as a whole. Therefore, it is possible to suppress color unevenness due to the entire white LED light sources 11. Become.

  (2) The plurality of white LED light sources 11 are arranged so that the arrangement center of the LED group LG is inverted every one. By setting it as such a structure, when the arrangement | positioning space | interval in the arrangement | positioning direction of the white LED light source 11 is wide, the color nonuniformity which can generate | occur | produce can be suppressed.

  (3) The plurality of white LED light sources 11 are arranged such that the center position P0 of the housing portion 22 is aligned in a straight line. By setting it as such a structure, the brightness nonuniformity which generate | occur | produces in the arrangement | positioning direction of the white LED light source 11 can be suppressed.

(4) Since the diffusion panel 13 is provided in the irradiation direction of the plurality of white LED light sources 11, the diffusion effect by the diffusion panel 13 is added, and color unevenness can be further suppressed.
In addition, you may change embodiment of this invention as follows.

In the above embodiment, the configuration including the diffusion panel 13 is employed, but a configuration in which the diffusion panel 13 is omitted may be employed.
In the above embodiment, a configuration including the condensing lens 12 is employed, but a configuration in which the condensing lens 12 is omitted as illustrated in FIGS. 3A and 3B may be employed. A configuration in which the condenser lens 12 and the diffusion panel 13 are omitted may be employed.

  In the above embodiment, although not particularly mentioned, the light exit surface 12a of the condenser lens 12 may be subjected to light diffusion processing such as prisms, dimples, and wrinkles. By adopting such a configuration, color unevenness can be further reduced.

  -In above-mentioned embodiment, although arrange | positioned so that the center position P0 of the accommodating part 22 of the said several white LED light source 11 may align in linear form, it is not restricted to this. For example, when arranging in a curved line according to the specifications of the illumination device 10 or the like, the central positions P0 of the accommodating portions 22 of the plurality of white LED light sources 11 may be arranged in a curved line.

-In above-mentioned embodiment, although arrange | positioned so that the center position P0 of the accommodating part 22 of the said some white LED light source 11 may align in linear form, it is not restricted to this. For example, as shown to Fig.2 (a), you may arrange | position so that the arrangement center P1 of LED group LG may align in linear form. At this time, as shown in FIGS. 2B and 2C, the LED light source 11 is arranged so that the design center DC1 of the condenser lens 12 and the arrangement center P1 of the LED group LG coincide with each other. By adopting such a configuration, the luminance unevenness can be suppressed by matching the design center of the lens and the luminance center of the light emitting unit as shown in FIGS. In addition, when arranging in the shape of a curve according to the specification of the illuminating device 10, etc., you may arrange | position so that the arrangement | positioning center P1 of LED group LG may align in a linear form. With this configuration,
In the above-described embodiment, the plurality of white LED light sources 11 are arranged so that the arrangement center P1 of the LED group LG is inverted every one. However, the arrangement is not limited to this, and the arrangement centers are arranged at predetermined intervals (for example, two or more). You may arrange | position so that P1 may reverse.

  DESCRIPTION OF SYMBOLS 10 ... Illuminating device, 11 ... White LED light source, 12 ... Condensing lens, 12a ... Light emission surface, 13 ... Diffusion panel, 21 ... Blue LED element, 22 ... Housing part, LG ... LED group, P0 ... Center position, P1 ... center of placement, DC1 ... center of design.

Claims (7)

A plurality of white LED light sources each having an LED group including one or more blue LED elements, a phosphor, and a housing portion that houses the LED group,
In the housing part, blue LED elements are arranged in a biased manner and the placement center of the LED group is shifted from the center of the housing part,
The lighting device according to claim 1, wherein at least one of the plurality of white LED light sources is arranged such that an arrangement center of the LED group is inverted as compared with other white LED light sources. The lighting device according to claim 1.
The plurality of white LED light sources are arranged so that the arrangement center of the LED group is inverted at predetermined intervals. The lighting device according to claim 1 or 2,
The plurality of white LED light sources are arranged so that the arrangement center of the LED group is inverted for each one. In the illuminating device as described in any one of Claims 1-3,
A condenser lens is provided in the irradiation direction of the plurality of white LED light sources,
The plurality of white LED light sources are arranged such that an arrangement center of the LED group coincides with a design center of the condenser lens. In the illuminating device as described in any one of Claims 1-3,
The plurality of white LED light sources are arranged such that a central position of the housing portion is aligned in a linear shape or a curved shape. In the illuminating device as described in any one of Claims 1-5,
An illumination device comprising a diffusion panel in an irradiation direction of the plurality of white LED light sources. In the illuminating device as described in any one of Claims 1-6,
A condenser lens is provided in the irradiation direction of the plurality of white LED light sources,
The condensing lens has a light diffusing treatment on a light emitting surface thereof.