JP2014203793A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device which can change an outstanding feeling of a viewing object to which illumination light is radiated.SOLUTION: An illumination device 1 includes: a light source 2; and a plurality of lenses 3a and 3b for controlling light distribution of light emitted from the light source 2. The light source 2 and the lenses 3a and 3b can be moved with respect to the other, and the lenses 3a and 3b are configured so that beam angles of emission light are different with each other. The lens 3b in which the beam angle is relatively narrow is configured so that an outstanding index FCI of the emission light is increased by changing a wavelength component of incident light to the lens 3b. By changing not only an irradiation range of the illumination light but also the FCI, an outstanding feeling of a viewing object to which the illumination light is radiated can be changed more effectively.

Description

  The present invention relates to an illumination device that changes the light distribution and wavelength components of emitted light.

  Conventionally, when illuminating a display shelf or the like of a store with a lighting device, there are a case where it is desired to illuminate a wide area and a case where it is desired to make it stand out by illuminating only a specific area. As an illuminating device that enables such illumination, a device that includes a plurality of LEDs having different beam angles of emitted light and that changes the lighting state by switching the lighting state of the LEDs is known. (For example, refer to Patent Documents 1 and 2).

  Also, there is known a lighting fixture that includes an LED that is a light source and a plurality of lenses having different light distribution patterns and that can move the light distribution pattern of the illumination light by moving them with respect to the LED. (For example, refer to Patent Document 3). In the illumination devices described in Patent Documents 1 and 2, for example, when an LED with a narrow beam angle is lit, an LED with a wide beam angle is not used, and conversely, an LED with a wide beam angle is lit. LED with a narrow beam angle is not used. On the other hand, in the lighting fixture described in Patent Document 3, since the lens disposed on the LED is switched instead of the LED of the light source, the lighting efficiency of the LED can be improved.

JP 2011-222182 A JP 2012-14980 A Japanese Patent No. 4207931

  By the way, there is known an illumination technique that favorably displays the color of the visual object by vividly rendering the color of the visual object. In particular, it is known that the vividness of the color of a visual object in an illumination environment is influenced by the noticeable feeling received from the visual object.

  The illuminating devices described in Patent Documents 1 to 3 change the light distribution pattern, for example, by increasing the illuminance of a part of the irradiation area, so that the products and the like arranged in the area can be made conspicuous. However, the above-mentioned conspicuous feeling does not depend only on the illuminance on the visual target. For this reason, the visual target cannot be effectively produced using the illumination light, and the purchase intention may not be stimulated.

  The present invention solves the above-described problems, and an object of the present invention is to provide an illuminating device that can change the conspicuous feeling of a visual object by illumination irradiated with illumination light.

  In order to solve the above-described problem, the present invention provides a lighting device including a light source and a plurality of lenses that control light distribution of light emitted from the light source, wherein the light source and the plurality of lenses are The one lens is movable with respect to the other, and the plurality of lenses are configured such that the beam angles of the emitted light are different from each other, and a lens having a relatively narrow beam angle is a wavelength component of light incident on the lens. And the conspicuousness index FCI of the light emitted from the lens is increased.

  In the illumination device, it is preferable that a lens having a relatively narrow beam angle among the plurality of lenses has a low transmittance with respect to a wavelength component having a wavelength of 580 nm.

  In the illuminating device, it is preferable that a lens having at least three kinds of lenses and having a relatively narrow beam angle has a lower transmittance with respect to a wavelength component having a wavelength of 580 nm.

  In the illuminating device, it is preferable that a lens having a relatively narrow beam angle among the plurality of lenses has a filter having a low transmittance with respect to a wavelength component having a wavelength of 580 nm on an emission surface thereof.

  In the illuminating device, it is preferable that a lens having at least three kinds of lenses and having a relatively narrow beam angle has a lower transmittance with respect to a wavelength component having a wavelength of 580 nm in the filter.

  The illumination device further includes a rotating body in which the plurality of lenses are arranged in an annular shape, and the rotating body is rotatable with respect to the light source. It is preferable that the lens on which the light enters is switched.

  According to the present invention, not only the illumination light irradiation range but also the conspicuous index FCI is changed, so that the conspicuous feeling of the visual object irradiated with the illumination light can be changed more effectively.

(A) is a partial exploded perspective view of the illuminating device which concerns on one Embodiment of this invention, (b) is a perspective view of the illuminating device. The sectional side view of LED used for the illuminating device. (A) is a side sectional view of a lens having a relatively wide beam angle used in the illumination device, and (b) is a side sectional view of a lens having a narrow beam angle. (A) (b) is a sectional side view for demonstrating operation | movement of the illuminating device. The figure which shows the spectral spectrum of the illumination light of the illumination device. (A) (b) is a perspective view for demonstrating the usage example of the same illuminating device. The partially exploded perspective view of the illuminating device which concerns on the 1st modification of the said embodiment. (A) (b) (c) is a sectional side view of the lens used for the illumination device. (A) (b) is a sectional side view for demonstrating operation | movement of the illuminating device. The figure which shows the spectral spectrum of the illumination light of the illumination device. The partial exploded perspective view of the illuminating device which concerns on the 2nd modification of the said embodiment. (A) (b) (c) is a sectional side view for demonstrating operation | movement of the illumination device. The partially exploded perspective view of the illuminating device which concerns on the 3rd modification of the said embodiment. (A) is a top view for explaining one operation of the illumination device, (b) is a cross-sectional side view, (c) is a top view for explaining other operations, and (d) is a cross-sectional side view. (E) is a top view for demonstrating another operation | movement, (f) is the same sectional side view.

  An illumination device according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1A and 1B, the illumination device 1 according to this embodiment includes a light source 2 and a plurality of lenses 3a and 3b that control the light distribution of the light emitted from the light source 2. . One of the light source 2 and the lenses 3a and 3b is movable with respect to the other. The illumination device 1 also includes a lens unit 30 that holds the lenses 3 a and 3 b and a slide unit 4 that allows the lens unit 30 to slide relative to the light source 2. The lenses 3 a and 3 b can be moved with respect to the light source 2 by the slide unit 4. The illumination device 1 also includes an operation unit 5 for a user to change the distribution of illumination light, and a power supply unit (not shown) that supplies predetermined power to the light source 2 and the slide unit 4. In addition, although the example of a figure shows the structure by which the operation part 5 and the slide unit 4 were connected by the wire cable W, transmission / reception of the control signal between these does not ask | require wired or wireless.

  The slide unit 4 includes a base 41 on which the light source 2 is mounted, a unit main body 42 on which the base 41 is mounted, a holding unit 43 that holds the lens unit 30, and a holding unit 43 that is provided on the unit main body 42 and can slide. And a rail 44. The slide unit 4 includes a drive unit (not shown) that slides the lens unit 30 via the holding unit 43.

  The operation unit 5 includes a lighting switch 51 for turning on and off the light source 2 and a plurality of changeover switches 52a and 52b for changing the light distribution pattern of the illumination light emitted from the lighting device 1. The lighting switch 51 is composed of a push button switch or the like, and opens and closes a power supply path from the commercial AC power supply to the power supply unit. The operation unit 5 incorporates a control unit (not shown) that drives the light source 2 and the slide unit 4 so that the light distribution pattern set by the operation of the switches 52a and 52b is obtained. Note that the operation unit 5 and the power supply unit may be configured independently of each other.

  As the light source 2, a solid light emitting element (LED) is used. For example, as illustrated in FIG. 2, the light source 2 includes a base 20 having a rectangular cross section, a light emitting unit (LED chip) 21 mounted on the base 20, and a frame 22 having a recess surrounding the LED chip 21. And a filler 23 filled in the frame body 22. The filler 23 is made of a transparent resin material such as silicon, and contains a phosphor 24 that converts the wavelength of light emitted from the LED chip 21. Note that two or more kinds of phosphors 24 may be used, and the phosphor 24 is appropriately adjusted so that the light emitted from the light source 2 has a desired emission spectrum.

  A cathode electrode 25 is provided on one side surface of the substrate 20, and an anode electrode 26 is provided on the other side surface, which are connected to external connection electrodes 27 and 28 formed at both ends of the lower surface of the substrate 20. Further, the cathode electrode 25 and the anode electrode 26 are connected to respective electrode terminals (not shown) of the LED chip 21 by wires 29. The inner peripheral surface of the frame 22 is formed as a conical surface that opens in the light-derived direction, and the surface of the conical surface has a light reflecting function.

  The LED chip 21 is preferably a blue LED element that emits blue light. By adjusting the type or content of the phosphor 24, the LED 2 that emits light of a desired chromaticity can be obtained. In the present embodiment, the light source 2 uses a YAG phosphor that converts blue light into yellow light as the phosphor 24, and emits white light obtained by mixing the blue light and yellow light.

  The lenses 3a and 3b are made of a translucent resin material such as acrylic resin, and are configured such that the beam angles of the emitted light are different from each other. In the present embodiment, two types of lenses, a lens 3 a having a relatively wide beam angle of emitted light and a lens 3 b having a relatively narrow beam angle, are arranged side by side in the lens unit 30.

  For example, as shown in FIG. 3A, the lens 3a having a wide beam angle is formed such that the central portion of one surface is concave and the other surface is flat so that the periphery thereof is convex. Has been. The lens 3a functions as an incident surface with a flat surface facing the light source 2, and an uneven surface functions as an exit surface that refracts and emits incident light, whereby incident light from the light source 2 is converted into diffused light. To do.

  On the other hand, the lens 3b having a narrow beam angle is formed such that, for example, as shown in FIG. 3B, one surface has a Fresnel structure and the other surface is a flat surface. The lens 3b has a flat surface facing the light source 2 and functions as an incident surface, and the surface of the Fresnel structure functions as an exit surface that refracts and emits incident light, so that incident light from the light source 2 is substantially parallel light. And

  The two types of lenses 3 a and 3 b configured as described above are arranged in a row on the lens unit 30, and the lens unit 30 is movable with respect to the light source 2 by the slide unit 4. For example, as shown in FIG. 4A, when a lens 3a is arranged on the light source 2, illumination light is irradiated at a wide angle, and as shown in FIG. When arranged, illumination light is irradiated at a narrow angle.

  Among these lenses 3a and 3b, the lens 3b having a relatively narrow beam angle is configured to change the wavelength component of the incident light and increase the conspicuous index FCI (Feeling of contrast index) of the emitted light. .

  FCI is an index representing the degree of conspicuousness and vividness of color reproduction of a light source. The FCI is 100 with the reference light source D65, and a light source with an FCI greater than 100 makes the space appear brighter and brighter than the reference light source D65. ). Specifically, it is determined by the following formula (1).

Ｇ_ＬＡＢ（Ｔ）：テスト光源下での赤・青・緑・黄の４色配色サンプルのＬＡＢ表色系における色域面積
Ｇ_ＬＡＢ（Ｄ６５）：基準光源Ｄ６５下での同４色配色サンプルのＬＡＢ表色系における色域面積

G _LAB (T): Color gamut area in the LAB color system of the red, blue, green, yellow four-color color sample under the test light source G _LAB (D65): The same four-color color sample under the reference light source D65 Color gamut area in LAB color system

  In the lens 3b having a narrow beam angle, a dye that selectively absorbs light of a predetermined wavelength component is added to the translucent resin material constituting the lens 3b, and this dye is used as the incident light to the lens 3b. The FCI of the emitted light is increased by changing the predetermined wavelength component. Here, it is preferable that the lens 3b increases the FCI of the emitted light to be greater than 123.

  In the present embodiment, the lens 3b is configured to have a low transmittance with respect to a wavelength component in the vicinity of a wavelength of 580 nm. Specifically, the lens 3b contains a dye having high absorbance with respect to a wavelength component in the vicinity of a wavelength of 580 nm. As this type of pigment, for example, neodymium is used. The lens 3b preferably also contains a dye having high absorbance with respect to a wavelength component in the vicinity of a wavelength of 460 nm. On the other hand, the dye 3 is not added to the lens 3a having a wide beam angle, and is emitted without changing the wavelength of the incident light from the light source 2.

  FIG. 5 shows a spectrum of illumination light in a lighting state using a lens 3a having a wide beam angle (lighting state (a): see FIG. 4A) and a lighting state using a lens 3b having a narrow beam angle (lighting). FIG. 4B shows the spectrum of the illumination light in the state (b) (see FIG. 4B). The lens 3a having a wide beam angle emits light as it is without changing the wavelength component of the light from the light source 2 because no pigment is added to the translucent resin constituting the lens. As a result, the FCI of the illumination light having the spectrum in the lighting state (a) in FIG. On the other hand, the lens 3b having a narrow beam angle (lighting state (b)) restricts the transmission of light having a wavelength component near the wavelength of 580 nm and a wavelength component near the wavelength of 460 nm to the translucent resin constituting the lens. As a result, the FCI of the illumination light having the spectrum in the lighting state (b) in FIG. Thus, the lens 3b can increase the FCI by 1.3 times by limiting the transmission of these wavelength components in the illumination light.

  FIG. 6 shows an example in which the lighting device 1 configured as described above is used as a spotlight for a store. As shown in FIG. 6A, when the product P is arranged in a wide range of the product shelf F and it is desired to uniformly illuminate the whole, the beam angle of the illumination light is widened. On the other hand, as shown in FIG. 6B, when the product P is arranged in a part of the product shelf F and the product P is to be made conspicuous, the beam angle of the illumination light is narrowed. At this time, the range in which the illumination light in the product shelf F is irradiated becomes narrower, and not only the product P is intensively irradiated but also the FCI of the illumination light increases, so that the product P can be made more conspicuous. . Thus, the illuminating device 1 can change the conspicuous feeling of the visual target object irradiated with illumination light more effectively by changing not only the illumination light irradiation range but also the FCI in two stages. .

  Note that when the FCI is increased, the transmission of wavelength components in the vicinity of the wavelength of 580 nm is limited, so that the luminance of illumination light may be lower than when the FCI is not increased. However, in the present embodiment, the lens 3b that increases FCI has a narrower beam angle of emitted light than the lens 3a that does not increase FCI, so the illuminance on the irradiated surface hardly decreases. When the lens 3a is a diffusing lens and the lens 3b is a condensing lens, the control unit built in the operation unit 5 emits light from the light source 2 so as to mitigate illuminance change when the lens is switched. It is preferable to increase or decrease the output appropriately.

  Next, an illumination device according to a first modification of the above embodiment will be described with reference to FIGS. As shown in FIG. 7, the illumination device 1 of the present modification includes three types of lenses 3a, 3b, and 3c designed so that the beam angles of the emitted light are different. Among these lenses 3a, 3b and 3c, the lens 3a has the widest beam angle, the lens 3c has the narrowest beam angle, and the lens 3b has the intermediate beam angle. In this modification, the slide unit 4 enables the lens unit 30 to slide on the base 41 on which the light source 2 is mounted.

  As shown in FIG. 8A, the lens 3a having the widest beam angle is configured as a diffusion lens, and as shown in FIG. 8C, the lens 3c having the narrowest beam angle is configured as a condenser lens. Further, as shown in FIG. 8B, the intermediate lens 3b is not subjected to optical processing for changing the light distribution. Then, as shown in FIGS. 9A to 9C, the illumination light distribution becomes narrower every time the lenses 3a, 3b, 3c arranged on the light source 2 are switched in this order. The lenses 3a, 3b, and 3c are switched by moving the base 41 on which the light source 2 is mounted by the slide unit 4 when the user presses the selector switches 52a, 52b, and 52c of the operation unit 5 (see FIG. 7). Is called.

  In this modification, the lenses 3a, 3b, and 3c have the above-described pigments added to the translucent resins constituting them in different contents, and the lens having a narrower beam angle has a wavelength of 580 nm. The transmittance for the component is low. FIG. 10 shows the lighting state (a); FIG. 10 (a) and the lighting state (b); FIG. 10 (b) and the lighting state (c); 10 (c) shows a spectrum of illumination light. The FCI of the illumination light having these spectral spectra was 108, 130, and 142, respectively. By using these lenses 3a, 3b, 3c, the FCI can be increased as the beam angle of the illumination light becomes narrower. As a result, according to the illuminating device 1 of the present modification, not only the illumination light irradiation range but also the FCI can be changed in three stages to make the visual object stand out.

  An illumination device according to a second modification of the embodiment will be described with reference to FIGS. 11 and 12. As shown in FIG. 11, the illuminating device 1 of this modification has three types of lenses 3a, 3b, 3c designed so that the beam angles of the emitted light are different, as in the first modification. ing. These lenses 3a, 3b, and 3c are colorless and transparent lenses to which no dye is added. Among these, the lenses 3b and 3c having a relatively narrow beam angle have wavelength components in the vicinity of a wavelength of 580 nm on their exit surfaces. Filters 6a and 6b having low transmittance. The filters 6a and 6b are made of a translucent resin so as to match the shape of the exit surface of the lenses 3b and 3c so as not to affect the light distribution characteristics of the lenses 3b and 3c. In addition, in the filters 6a and 6b, pigments that absorb light having a wavelength component in the vicinity of a wavelength of 580 nm are added at different concentrations. Here, the filter 6b has a higher pigment concentration than the filter 6a, absorbs light of a wavelength component near the wavelength of 580 nm, and increases the FCI of the illumination light.

  The lenses 3b and 3c covered with the filters 6a and 6b control the beam angle of the emitted light as compared with the lenses 3b and 3c used in the first modification, and are compared with the emitted light of the lens 3a. Thus, the FCI can be increased. Therefore, according to the illuminating device 1 of the present modification, not only the illumination light irradiation range but also the FCI can be changed in three stages to make the visual object stand out. Further, by using a filter (not shown) having a different pigment content from the above-described filters 6a and 6b, the FCI of the illumination light can be further changed to another value. Then, by appropriately changing the combination of the lens that controls the beam angle and the filter that controls the FCI, it is possible to increase the light distribution of illumination light and variations in FCI.

  Next, an illumination device according to a third modification of the above embodiment will be described with reference to FIGS. 13 and 14. As shown in FIG. 13, the illumination device 1 of the present modification is designed such that three light sources 2 are arranged at regular intervals along the periphery of a disc-shaped base 41 and the beam angles of emitted light are different. Three sets of three types of lenses 3a, 3b, and 3c are provided. Moreover, the illuminating device 1 is further provided with the disk-shaped rotary body 7 in which the lenses 3a, 3b, 3c are arranged in an annular shape. The rotating body 7 is rotatable with respect to the light source 2 and functions in the same manner as the lens unit 30 of the above embodiment. The lighting device 1 further includes a rotating unit (not shown) that rotates the rotating body 7. In FIG. 13, the operation unit 5 (see FIG. 7) is not shown.

  The three types of lenses 3a, 3b, and 3c are the same as the lenses 3a, 3b, and 3c shown in the first modification. Therefore, according to the illumination device 1 of this modification, as shown in FIGS. 14A to 14F, the rotating body 7 rotates, so that the lenses 3a, 3b, 3c on which the light from the light source 2 is incident. Switches. As a result, not only the illumination light irradiation range but also the FCI can be changed in three stages to make the visual object stand out. In addition, since there are three light sources, the luminous flux of the illumination light can be increased and the luminance on the irradiation surface can be increased as compared with the embodiment and the modification. When there are three or more types of lenses, the operation unit 5 is not limited to a push button switch, and may be, for example, a fader for controlling the beam angle and FCI.

  In addition, this invention is not restricted to the said embodiment, A various deformation | transformation is possible. For example, in the above-described embodiment and the modification, the configuration using two or three types of lenses having different beam angles of the emitted light is shown, but three or more types of lenses may be used. Further, a plurality of types of light sources 2 having different spectrums of emitted light may be used. The types of lenses and LEDs and the combinations thereof are not limited to those described above, but may be anything that can change the beam angle and the conspicuous index FCI.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light source 3a, 3b, 3c Lens 7 Rotating body

Claims (6)

A lighting device comprising: a light source; and a plurality of lenses that control light distribution of light emitted from the light source,
One of the light source and the plurality of lenses is movable with respect to the other,
The plurality of lenses are configured such that the beam angles of the emitted light are different from each other, and the lens having a relatively narrow beam angle changes the wavelength component of the incident light to the lens to make the emitted light from the lens conspicuous A lighting device configured to increase the index FCI.   2. The illumination device according to claim 1, wherein a lens having a relatively narrow beam angle among the plurality of lenses has low transmittance with respect to a wavelength component having a wavelength of 580 nm.   The illumination device according to claim 2, wherein the illumination device has at least three kinds of lenses, and the transmittance of the wavelength component having a wavelength of 580 nm is lower as the lens has a relatively narrow beam angle.   The illumination device according to claim 1, wherein a lens having a relatively narrow beam angle among the plurality of lenses has a filter having a low transmittance with respect to a wavelength component having a wavelength of 580 nm on an emission surface thereof.   The illumination device according to claim 4, wherein a lens having at least three types of lenses and having a relatively narrow beam angle has a lower transmittance with respect to a wavelength component having a wavelength of 580 nm in the filter. A rotating body in which the plurality of lenses are arranged in an annular shape;
6. The rotating body according to claim 1, wherein the rotating body is rotatable with respect to the light source, and the lens on which light from the light source is incident is switched by rotating the rotating body. The lighting device according to claim 1.

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