JP2017069021A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device using a light guide which makes it possible to obtain not only uniform illumination light but also spot light with a simple structure.SOLUTION: An illumination device 1 includes an LED 31, a light guide 2, and a reflection part 4. The light guide 2 has an incoming surface 20 on which light emitted from the LED 31 is made incident, an outgoing surface 21 disposed opposite the incoming surface 20, and a light-emitting surface 22 to cause plane emission. The reflection part 4 has a reflection surface 4a not being orthogonal to the light-emitting surface 22, and is configured so that the light emitted from the outgoing surface 21 of the light guide 2 is reflected from the reflection surface 4a and reflection light L2 is distributed to outside the light guide 2.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a lighting device, and more particularly, to a lighting device using a light guide.

  As an illuminating device, for example, Japanese Utility Model Laid-Open No. 6-38117 discloses that light incident from the end face of the light guide plate is reflected by the light reflecting layer on the upper surface of the light guide plate and is irradiated with uniform light downward from the lower surface of the light guide plate. A lighting apparatus is described (see paragraph [0009] of FIG. 1 and FIG. 1).

  The above publication describes that the lamp is provided on the end face of the light guide plate so that the surface of the light guide plate has no irregularities, so that the work for displaying the article on the shelf below the light guide plate is facilitated (see the same publication). Paragraph [0010]).

  On the other hand, depending on the article irradiated with light, there is a demand not only to irradiate the entire article with simple light but also to irradiate a part of the article with spot light.

  The present invention has been made in view of such a conventional situation, and the problem to be solved by the present invention is to provide not only uniform illumination light but also spot light in an illumination device using a light guide. It is to realize what can be obtained with a simple structure.

  An illumination device according to the present invention includes a light source, a light guide having an incident surface on which light emitted from the light source is incident, an output surface disposed on the opposite side of the incident surface, and a light emitting surface that emits light, and a light emitting surface And a reflecting portion that reflects light emitted from the light source by the reflecting surface and distributes the reflected light to the outside of the light guide (see claim 1). .

  According to the present invention, the light emitted from the light source and incident on the incident surface of the light guide is irradiated from the light emitting surface of the light guide while passing through the inside of the light guide. At this time, uniform irradiation light (overall illumination light) can be obtained by emitting light from the light emitting surface of the light guide. On the other hand, the light that has reached the exit surface of the light guide through the inside of the light guide is reflected by the reflection surface of the reflection portion, and the reflected light is distributed outside the light guide. With this reflected light, spot light as partial illumination light can be obtained.

  In the present invention, spot light can be obtained using a light source for general illumination without requiring a separate light source for spot illumination, so that the structure of the entire apparatus can be simplified. Moreover, since the reflecting surface of the reflecting portion is not orthogonal to the light emitting surface of the light guide, the reflected light from the reflecting surface can be distributed outside the light guide and spot light can be obtained effectively. .

  In this invention, the reflected light by the reflective surface of a reflection part is irradiated to the at least one part area | region of the irradiation area | region by the light emission surface of a light guide (refer Claim 2).

  In the present invention, at least a part of the light reflected by the reflecting surface of the reflecting portion is distributed outside the light guide without passing through the light guide (see claim 3).

  In this invention, the light guide is provided in the shelf board and the light source is arrange | positioned at the back side of the shelf board (refer Claim 4).

  According to the present invention, since the spot light can be obtained by using the light source for whole illumination without separately requiring a light source for spot illumination, the structure can be simplified.

It is the whole front perspective view which looked at the shelf by which the illuminating device by one Example of this invention was employ | adopted from diagonally upward. It is the whole front perspective view which looked at the said shelf (FIG. 1) from diagonally downward, Comprising: The light guide which comprises an illuminating device is shown. It is the whole rear perspective view which looked at the said shelf (FIG. 1) from diagonally upward, Comprising: The LED unit which comprises an illuminating device is shown. It is a rear view of the said shelf (FIG. 1), Comprising: The said LED unit (FIG. 3) has shown the state connected to the power supply. It is a whole perspective view of the said LED unit (FIG. 3). It is the VI-VI line longitudinal cross-sectional view of FIG. 4, Comprising: The longitudinal cross-section of the LED unit which comprises an illuminating device, a light guide, and a reflection part is shown. It is the isometric view fragmentary view which looked at the said light guide and the reflection part (FIG. 6) from the downward direction. FIG. 7 is a partially enlarged view of FIG. 6, showing an emission surface and a reflection part of the light guide. FIG. 7 is a partially enlarged view of FIG. 6, showing the incident surface of the light guide and the LED unit, as well as how the emitted light from the LED unit travels inside the light guide. FIG. 7 is a partially enlarged view of FIG. 6, showing a state in which light emitted from the LED unit and traveling through the light guide is reflected by the reflecting portion. The product placed on the shelf plate of the shelf (FIG. 1) is illuminated entirely with the irradiation light from the light emitting surface of the light guide, and is reflected from the light exiting surface of the light guide and reflected by the reflecting portion. A state in which partial illumination (spot illumination) is performed with light irradiated by light is shown. FIG. 11 shows a state where the irradiation area of the spot illumination overlaps the irradiation area of the overall illumination. It is a figure which shows typically arrangement | positioning when a reflection part is seen from the side in the said Example. It is a modification of FIG. 13, and shows an example in which the inclination of the reflecting portion is different. FIG. 13 shows another modification of FIG. 13, in which the exit surface of the light guide is an inclined surface. FIG. 13 shows still another modified example of FIG. 13, in which the exit surface of the light guide is an inclined surface and the reflecting portion is mounted on the exit surface of the light guide. It is another modification of FIG. 13, Comprising: The reflection part has shown the example which has two reflective surfaces. FIG. 14 shows still another modified example of FIG. 13 in which the reflecting portion is a concave mirror. In the said Example, it is a figure which shows arrangement | positioning when a reflection part is seen from diagonally upward, Comprising: The irradiation area | region of the reflected light by a reflection part is also shown collectively. FIG. 19 shows a modification of FIG. 19 in which the length of the reflecting portion is changed, and also shows an irradiation area of reflected light by the reflecting portion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 13 are views for explaining an illumination device according to an embodiment of the present invention. Here, an LED illumination device using an LED (light emitting diode) as a light source is taken as an example.

  1 to 4 show a shelf in which the LED lighting device according to the present embodiment is employed. As shown in these drawings, the shelf 10 is assembled in a frame shape from a top plate (broadly defined shelf plate) 10A, a bottom plate (broadly defined shelf plate) 10B, and left and right side plates 10C, and a back plate 10D is provided on the back side. The internal space surrounded by the top plate 10A, the bottom plate 10B, each side plate 10C and the back plate 10D is partitioned into a plurality of cells by a partition plate 10E and a shelf plate (a narrowly defined shelf plate) 10F. Here, the shelf 10 is composed of 4 × 4 squares as an example, but other squares (for example, 2 × 2 squares, 1 × 3 squares, 4 × 1 squares, 1 × 1 squares, etc.) But you can.

  The light guides 2 are respectively provided on the lower surfaces of the top plate 10A and the shelf plates 10F (see FIG. 2). Each light guide 2 is disposed so as to substantially cover each lower surface of the top plate 10A and each shelf plate 10F. Each light guide 2 is made of, for example, an acrylic plate. In addition, LED units 3 are provided on the back side of the top plate 10A and each shelf plate 10F (see FIG. 3). Each LED unit 3 extends in the left-right direction along the arrangement direction of the top plate 10A and each shelf plate 10F. Here, an example in which four LED units 3 are provided is shown. Each LED unit 3 is connected to a power supply unit PS via a power cable 15 (see FIG. 4).

  As shown in FIG. 5, the LED unit 3 includes a base member 30 having a U-shaped cross section extending in the longitudinal direction, a substrate 32 mounted inside the base member 30 and mounted with a plurality of LEDs (light sources) 31, It has a transparent or translucent lid 33 that covers the front side opening of the base member 30.

  As shown in FIG. 6, the light guide 2 is disposed on the opposite side of the incident surface 20 on which the light emitted from the LED 31 is incident, and proceeds through the inside of the light guide 2. It has an emission surface 21 through which light is emitted, and a light emitting surface 22 that is disposed on the lower side and emits light. On the upper surface 23 arranged on the opposite side of the light emitting surface 22, a light reflecting layer 23A formed by, for example, forming a white dot pattern by silk screen printing or the like is formed (see FIG. 11). The incident surface 20 is preferably disposed to face the LED 31, and the emission surface 21 is preferably parallel to the incident surface 20 and orthogonal to the light emitting surface 22. FIG. 6 shows the light guide 2 provided on the lower surface of each shelf 10F, but the light guide 2 provided on the lower surface of the top plate 10A also has the same configuration. A recess 10Fa is formed in the vicinity of the front end of the upper surface of each shelf board 10F. These recesses 10Fa accommodate a part of the articles (goods) placed on each shelf board 10F, thereby positioning the goods on each shelf board 10F and receiving the goods from each shelf board 10F. It is provided to prevent it from falling off.

  A reflection part (reflection mirror) 4 is provided in front of the emission surface 21 of the light guide 2 as shown in FIGS. The reflection surface 4 a (FIG. 8) of the reflection unit 4 is not disposed orthogonal to the light emitting surface 22 of the light guide 2, and is therefore inclined with respect to the incident surface 20 and the emission surface 21 of the light guide 2. (See FIG. 6). The inclination angle θ (FIG. 8) of the reflecting surface 4a with respect to the light emitting surface 22 of the light guide 2 is set to 45 °, for example. The reflecting portion 4 is mounted on an inclined surface 10Fb (FIG. 7) formed at the front end of the shelf board 10F, and has a length that is the same as or slightly shorter than the length of the inclined surface 10Fb.

Next, the function and effect of this embodiment will be described with reference to FIGS.
The light emitted from the LED 31 and incident on the incident surface 20 of the light guide 2 travels forward in the light guide 2 (see FIGS. 9 and 11), and the light on the upper surface 23 of the light guide 2. Reflected by the reflective layer 23A, the reflected light is irradiated downward from the light emitting surface 22 of the light guide 2 (see FIG. 11). At this time, uniform irradiation light (entire illumination light) can be obtained because the light emitting surface 22 of the light guide 2 emits light. The product (glasses in this example) P placed on the lower shelf board 10F is entirely illuminated by the irradiation light L1 from the light emitting surface 22 (see FIG. 11).

  On the other hand, the light that has reached the light exit surface 21 of the light guide 2 through the inside of the light guide 2 is emitted from the light exit surface 21 and reflected by the reflective surface 4a of the reflector 4 so that the reflected light L2 is guided. The light is distributed outside the light body 2 and irradiated downward (see FIGS. 10 and 11). With this reflected light L2, spot light which is partial illumination light can be obtained. A part of the product P placed on the lower shelf board 10F (in this example, the lens part of the glasses) is spot-illuminated by the reflected light L2 on the reflecting surface 4a and emphasized (FIG. 11). reference).

  Here, the irradiation region by the irradiation light L1 from the light emitting surface 22 of the light guide 2 is indicated by a region L1a in FIG. Indicated by L2a. As shown in FIG. 12, the irradiation area L2a by the reflected light L2 overlaps with a part of the irradiation area L1a by the irradiation light L1 (see the hatched area S in the figure).

  As described above, according to the present embodiment, since the spot light can be obtained by using the light source for overall illumination without separately requiring a light source for spot illumination, the structure of the entire apparatus can be simplified. Further, since the reflecting surface 4a of the reflecting portion 4 is not orthogonal to the light emitting surface 22 of the light guide 2 (and is therefore inclined with respect to the incident surface 20 and the emitting surface 21), the reflected light L2 from the reflecting surface 4a. Can be distributed outside the light guide 2, and spot light can be effectively obtained.

  According to the present embodiment, the LED 31 as a light source is provided on the back side of the top board 10A and the shelf board 10F (see FIGS. 1 and 3), and is disposed at a position away from the product P on the shelf board 10F. Therefore, the product P is not damaged or deteriorated by the heat of the light source. Moreover, since LED31 is arrange | positioned at the back side of the top plate 10A and the shelf board 10F, since thickness of the top board 10A and the shelf board 10F can be made thin, aesthetics can be improved.

  According to the present embodiment, each of the four LED units 3 corresponds to each of the squares aligned in the horizontal direction on the shelf 10 (see FIGS. 1 to 4), so the number of LED units 3 is reduced. Thus, the cost can be reduced and the maintainability can be improved.

  According to the present embodiment, uniform illumination light can be obtained by surface emission of the light emitting surface 22 of the light guide 2, so that the shape and color discrimination of the product P can be improved. For example, when the product P is sunglasses, the entire frame portion is illuminated and the lens portion is spot-lit, so that a subtle color difference of the lens portion can be easily identified.

  As mentioned above, although the suitable example for the present invention was described, application of the present invention is not limited to this, and various modifications are included in the present invention. Some examples of modifications are given below. In the drawings showing the respective modifications, the same reference numerals as those in the above-described embodiments denote the same or corresponding parts.

[First Modification]
In the above-described embodiment, the LED lighting device using the LED as the light source has been described as an example. However, the application of the present invention is not limited to this, and the present invention is similarly applied to the lighting device using other light sources. It is applicable to.

[Second Modification]
In the said Example, the irradiation area | region L2a by the reflected light L2 in the reflective surface 4a of the reflection part 4 overlaps with the one part area | region of the irradiation area | region L1a by the irradiated light L1 from the light emission surface 22 of the light guide 2. FIG. However, the overlap areas of the irradiation areas L2a and L1a are not limited to those shown in FIG.

[Third Modification]
In the embodiment, by setting the inclination angle θ of the reflecting surface 4a of the reflecting portion 4 to 45 ° (see FIG. 8), the reflected light L2 on the reflecting surface 4a is directly below (that is, perpendicular to the lower shelf plate 10F). In this example, the irradiation is performed (see FIG. 13), but the application of the present invention is not limited to this. As shown in FIG. 14, the inclination angle of the reflecting surface 4a may be smaller than 45 °. In this case, the irradiation direction of the reflected light L2 ′ on the reflection surface 4a is not directly below, but slightly inclined forward (leftward in FIG. 14), and the spot light irradiation region is positioned slightly forward from directly below. Become. On the contrary, the inclination angle of the reflecting surface 4a may be larger than 45 °. In this case, the irradiation direction of the reflected light on the reflecting surface 4a is not directly below, but is slightly inclined backward (to the right in FIG. 14), and the spot light irradiation region is located slightly behind from below. become.

[Fourth Modification]
In the said Example, although the output surface 21 of the light guide 2 showed the example parallel to the entrance surface 20, and orthogonal to the light emission surface 22, application of this invention is not limited to this. As shown in FIGS. 15 and 16, the emission surface 21 ′ may be an inclined surface that is inclined with respect to the incident surface 20 orthogonal to the light emitting surface 22. In the example shown in FIG. 15, the reflecting surface 4a of the reflecting portion 4 is disposed in parallel with the emitting surface 21 ′ with a gap e between the emitting surface 21 ′ and in the example shown in FIG. 4 is mounted on the exit surface 21 '. In any of these cases, the light emitted from the emission surface 21 ′ is reflected by the reflection surface 4 a of the reflection unit 4, is distributed toward the outside of the light guide 2 as reflected light L 2, and is irradiated downward. Therefore, the spot light can be similarly obtained by the reflected light L2.

[Fifth Modification]
In the example shown in FIG. 16 of the fourth modified example, the reflection portion 4 is provided separately from the light guide 2, but the light exit surface 21 ′ of the light guide 2 is not provided as the reflection surface without providing the reflection portion 4. By using it as 4a, the light that has traveled inside the light guide 2 may be totally reflected downward by the emission surface 21 '.

[Sixth Modification]
In the said Example, although all the reflected light L2 by the reflective surface 4a of the reflection part 4 showed light distribution outside the light guide 2 without passing the light guide 2, the example of this invention was shown. Application is not limited to this. For example, by adjusting the inclination angle θ of the reflection surface 4a or by setting the emission surface 21 of the light guide 2 to be an inclined surface (fourth modification), a part of the reflected light L2 is guided to the light guide 2. After returning to the inside, the light may be distributed to the outside.

[Seventh Modification]
In the said Example, although the example which all reflected light L2 by the reflective surface 4a of the reflection part 4 was irradiated below was shown, application of this invention is not limited to this. By disposing the reflecting surface 4a of the reflecting portion 4 upward, all the reflected light L2 from the reflecting surface 4a may be irradiated upward.

[Eighth Modification]
In the said Example, although the example which all reflected light L2 by the reflective surface 4a of the reflection part 4 was irradiated below was shown, application of this invention is not limited to this. For example, as shown in FIG. 17, the reflection unit 4 has two reflection surfaces 4 a and 4 b to irradiate the reflected light L <b> 2 from the reflection surface 4 a downward and the reflection light from the reflection surface 4 b. You may make it irradiate L3 upwards.

[Ninth Modification]
In the said Example, although the reflective surface 4a of the reflection part 4 showed the example comprised from the flat surface, application of this invention is not limited to this. As shown in FIG. 18, the reflection surface 4 a ′ of the reflection portion 4 may be formed of a concave surface. In this case, the reflected light L2 ″ reflected by the reflecting surface 4a ′ is collected as a convergent light beam. Conversely, the reflecting surface of the reflecting section 4 may be formed of a convex surface. In this case, the reflected light reflected by the reflecting surface is diverged as a diverging ray.In this way, when the reflecting surface is composed of a concave surface or a convex surface, the reflecting surface is a micro-planar whose inclination angle gradually changes. Since it can be regarded as a gathering, it can be said that the light guide 2 is inclined with respect to the incident surface 20 (and is therefore not orthogonal to the light emitting surface 22), in particular, as shown in FIG. As described above, when the concave optical axis is arranged to be inclined with respect to the incident surface 20 of the light guide 2, all the minute planes constituting the concave surface in actual use are incident surfaces of the light guide 2. 20 is inclined with respect to 20 (thus orthogonal to the light emitting surface 22). Not)

[Tenth Modification]
In the said Example, although the example in which the reflection part 4 was fixed was shown, application of this invention is not limited to this. The reflection unit 4 may be provided so as to be rotatable around a support shaft in the horizontal direction (the vertical direction in FIG. 13). In this case, the inclination angle of the reflecting surface 4a of the reflecting portion 4 can be changed by rotating the support shaft.

[Eleventh Modification]
In the said Example, although the light guide 2 was provided in the lower surface side of the shelf 10F, the light guide 2 may be provided in the upper surface side of the shelf 10F. For example, if the shelf 10 shown in the embodiment is used upside down and the product P is placed on the light emitting surface 22 of the light guide 2, the product P is entirely illuminated from below. At the same time, spot illumination is performed from below. Depending on the type of product P, such an illumination method may be suitable.

[Twelfth Modification]
In the said Example, although the reflection part 4 showed the example which has the length W comparable as the length of the inclined surface 10Fb of the shelf board 10F, or a little shorter than this (refer FIG. 7 and FIG. 19), As shown in FIG. 20, the reflecting portion 4 may have a shorter length W ′ (<W). In this way, by changing the length of the reflecting section 4, the irradiation area of the spot light that is the reflected light by the reflecting section 4 can be changed (see irradiation area L2a ′ in FIG. 20).

[Other variations]
The above-described embodiments and modifications are to be regarded as merely illustrative of the present invention in all respects and are not limiting. Those skilled in the art to which the present invention pertains will not depart from the spirit and essential characteristics of the present invention without departing from the spirit and essential characteristics thereof, even if not explicitly stated herein. Various modifications and other embodiments employing the above principle can be constructed.

[Other application examples]
In the said Example, although the said illuminating device showed the example applied to the shelf which has several squares, application of this invention is not limited to this, This invention is not limited to this. It is also applicable to shelves without side plates / partition plates and shelves without back plates (for example, shelves directly attached to the wall surface). The present invention can also be applied to a case where the light guide itself functions as a shelf. Furthermore, the present invention is also applicable to lighting devices other than shelves (for example, lighting devices for products on a display stand or a display table).

  The present invention is useful for a lighting device using a light guide.

1: LED lighting device (lighting device)

2: Light guide 20: Incident surface 21: Emission surface 22: Light emitting surface

3: LED unit 31: LED (light source)

4: Reflecting part 4a: Reflecting surface

10: Shelf 10A: Top plate (shelf)
10B: Bottom plate (shelf)
10F: Shelf board

L1: Irradiation light
L2, L2 ′, L2 ″, L3: Reflected light

Japanese Utility Model Publication No. 6-38117 (see paragraphs [0009] and [0010] and FIG. 1)

Claims (4)

In the lighting device,
A light source;
A light guide having an incident surface on which light emitted from the light source is incident, an output surface disposed on the opposite side of the incident surface, and a light emitting surface that emits light;
A reflecting portion that has a reflecting surface that is not orthogonal to the light emitting surface, and reflects the emitted light from the light source by the reflecting surface to distribute the reflected light to the outside of the light guide;
A lighting device comprising: In claim 1,
Reflected light from the reflecting surface of the reflecting portion is irradiated to at least a part of an irradiation region from the light emitting surface of the light guide.
A lighting device characterized by that. In claim 1,
At least a part of the light reflected by the reflecting surface of the reflecting portion is distributed outside the light guide without passing through the light guide;
A lighting device characterized by that. In claim 1,
The light guide is provided on a shelf plate, and the light source is disposed on the back side of the shelf plate,
A lighting device characterized by that.

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