CN111630314A

CN111630314A - Lighting device, signboard, showcase and anti-theft lamp

Info

Publication number: CN111630314A
Application number: CN201880086555.9A
Authority: CN
Inventors: 尾山和也
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2018-01-16
Filing date: 2018-08-27
Publication date: 2020-09-04
Also published as: JPWO2019142386A1; WO2019142386A1

Abstract

An illumination device having excellent light distribution characteristics is manufactured at low cost. The lighting device comprises a light emitting part (11) including an LED (21) and a light source cover (23), wherein the light emitting part (11) has a ratio of the front direction to the transverse direction of the LED (21), namely the transverse/longitudinal direction, of more than 1, and a reflecting plate (12) reflecting light emitted in the rear direction of the light emitting part (11) with respect to a light beam emitted from the surface of the light source cover (23).

Description

Lighting device, signboard, showcase and anti-theft lamp

Technical Field

The present invention relates to an illumination device, a signboard, a showcase and a security lamp using a light emitting diode as a light source.

Background

Conventionally, light emitting diodes (hereinafter, referred to as LEDs) have been used as light sources of lighting devices instead of fluorescent lamps and incandescent bulbs, because of their low power consumption, high luminance, and long life.

Fig. 61 is an explanatory view showing a light distribution state of the LED substrate 303. Fig. 62 is an explanatory view showing a light distribution state of a conventional light source unit 305 formed by covering the LED substrate 303 shown in fig. 61 with, for example, a milky-white tubular or spherical light source cover 304.

As shown in fig. 61, the LED301 is generally mounted on one surface of a substrate 302 and configured as an LED substrate 303, and has a light distribution characteristic in which light on the front lateral side is zero and the light distribution in the front direction is relatively large when viewed from the position of the LED 301. This is because there is no directivity compared to fluorescent and incandescent bulbs, and the LED301 has directivity. As shown in fig. 62, the light source section 305 formed by covering the LED substrate 303 with, for example, a milky tubular or spherical light source cover 304 has a light distribution characteristic in which the light distribution is slightly expanded in the lateral direction as compared with the case of the LED301 alone when viewed from the center of the light source section 305 by providing the light source cover 304.

Here, the illumination device having the light distribution characteristics as shown in fig. 61 or 62 is not particularly problematic when used as a general illumination device that irradiates one direction, such as the lower direction, for example. Actually, the conventional illumination device described above is often used as an illumination device that focuses light to illuminate one direction in combination with an umbrella-shaped reflection member.

On the other hand, an illumination device provided in, for example, a signboard or a showcase is preferably an illumination device having light distribution characteristics in which light distribution in the lateral direction is relatively large. Therefore, the illumination device having the light distribution characteristics as shown in fig. 61 or 62 is likely to cause a granular sensation, glare, and light unevenness of the light source, and is not suitable for the above-described application.

Therefore, in the configuration described in patent document 1, when a plurality of LEDs are provided, the LEDs are covered with the wavelength conversion member containing the fluorescent material, so that the light distribution in the lateral direction is relatively larger than that in the front direction.

In the configuration described in patent document 2, when a plurality of LEDs are provided, the light from the light source is spread in the lateral direction by covering each LED with a lens.

In the configuration described in patent document 3, a plurality of supports having a plurality of inclined surfaces are provided on a substrate, a diffusion plate is provided so as to face the substrate, and LED elements are mounted on the inclined surfaces of the supports, whereby light beams are diffused in a planar manner, and alignment distribution is made uniform by the diffusion plate.

Documents of the prior art

[ patent document ]

Patent document 1: japanese laid-open patent publication No. JP 2012-231036 "

Patent document 2: international publication "WO 2012/164790 publication"

Patent document 3: japanese laid-open patent publication No. JP 2012-174625 "

Disclosure of Invention

Technical problem to be solved by the invention

However, in the configuration described in patent document 1, when the illumination device includes a plurality of LEDs, the LEDs are covered with the wavelength conversion member, and therefore, the number of manufacturing steps for manufacturing the illumination device increases, and the cost of the components increases, which leads to an increase in the cost of the illumination device.

In the configuration described in patent document 2, when the illumination device includes a plurality of LEDs, each LED is covered with a lens, and therefore, the number of manufacturing steps in manufacturing the illumination device is similarly increased, and the cost of the components is increased, which leads to an increase in the cost of the illumination device. In addition, since a group of combinations of lenses and LEDs individually become point light sources, it becomes very dazzling when looking directly at the lighting device.

In addition, in the configuration described in patent document 3, since the LED elements are mounted on the respective slopes of the plurality of support members, the number of manufacturing steps in manufacturing the lighting device is similarly increased, and the cost of the components is increased, which leads to an increase in the cost of the lighting device.

Accordingly, an aspect of the present invention is to provide a lighting device, a signboard, a showcase, and a burglar alarm, which use LEDs, have excellent light distribution characteristics, and are low in cost.

Means for solving the problems

In order to solve the above problem, an illumination device according to an aspect of the present invention is an illumination device including an LED as a light source and a light emitting portion including a light source cover covering the LED, wherein the light emitting portion has a lateral/longitudinal direction which is a ratio between a front direction which is a direction in which a light distribution of the LED is strongest and a lateral direction orthogonal to the front direction of a light beam emitted from a surface of the light source cover and is 1 or more, and the illumination device includes a reflecting member which is provided on a surface opposite to the front direction of the light emitting portion and reflects light emitted from the light emitting portion in a rear direction of the light emitting portion.

Effects of the invention

According to an aspect of the present invention, it is possible to manufacture an illumination device at low cost with a simple configuration, using an LED as a light source, and having good light distribution characteristics.

Drawings

FIG. 1: a longitudinal section showing the configuration of the illumination device according to the embodiment of the present invention.

FIG. 2: fig. 2(a) is an explanatory view showing a light distribution state of the light emitting portion in a state where the reflector is not provided in the illumination device shown in fig. 1, and fig. 2(b) is a view showing a light distribution characteristic of the light emitting portion shown in fig. 2 (a).

FIG. 3: fig. 3(a) is an explanatory view showing a light distribution state of the illumination device shown in fig. 1, and fig. 3(b) is a view showing a light distribution characteristic of the illumination device shown in fig. 1.

FIG. 4: an exploded perspective view of a lighting device including the configuration of the lighting device shown in fig. 1 and including an LED substrate having a plurality of LEDs provided on a substrate is shown.

FIG. 5: fig. 5(a) is a perspective view of the light emitting section and the reflecting plate in a state where the LED substrate shown in fig. 4 is covered with the light source cover, fig. 5(b) is a vertical sectional view of the light emitting section and the reflecting plate shown in fig. 5(a), fig. 5(c) is a perspective view showing the lighting device in a state where the reflecting plate is attached to the rear surface of the light emitting section, and fig. 5(d) is a vertical sectional view of the lighting device shown in fig. 5 (c).

FIG. 6: fig. 6(a) is an explanatory view of a case where the LED substrate of the illumination device shown in fig. 5 is not covered with the light source cover and the reflection plate is not provided, and the reflected light of the light emitted from the LED is incident on the eyes. Fig. 6(b) is an explanatory diagram of a case where the reflected light of the light emitted from the light emitting unit of the illumination device shown in fig. 5 enters the eye.

FIG. 7: fig. 7(a) is an explanatory view showing the configuration and the light distribution state of an illumination device according to another embodiment of the present invention, and fig. 7(b) is a view showing the light distribution characteristics of the illumination device shown in fig. 7 (a).

FIG. 8: an exploded perspective view showing a configuration of an illumination device including the configuration of the illumination device shown in fig. 7(a) and including an LED substrate in which a plurality of LEDs are provided on a substrate.

FIG. 9: fig. 9(a) is a perspective view of the light emitting section and the reflector in a state where the LED substrate shown in fig. 8 is covered with the light source cover, fig. 9(b) is a perspective view of the illumination device shown in fig. 9(a) in a state where the reflector is attached to the rear surface of the light emitting section, and fig. 9(c) is a longitudinal sectional view of the illumination device shown in fig. 9 (b).

FIG. 10: fig. 10(a) is a perspective view of a signboard having the illumination device shown in fig. 9 therein according to another embodiment of the present invention, fig. 10(b) is a vertical sectional view showing an installation state of the illumination device of the signboard shown in fig. 10(a), and fig. 10(c) is a luminance distribution diagram of the signboard shown in fig. 10 (a).

FIG. 11: an explanatory view showing a light distribution state of the illumination device in a vertical section perpendicular to the back panel and the top panel of the signboard shown in fig. 10 is shown.

FIG. 12: fig. 12(a) is a perspective view showing a structure of a signboard according to a comparative example with respect to the signboard shown in fig. 10, fig. 12(b) is a vertical sectional view showing a state in which a light source unit is mounted on the signboard shown in fig. 12(a), and fig. 12(c) is a distribution diagram of illuminance of the signboard shown in fig. 12 (a).

FIG. 13: an explanatory view showing a light distribution state of the light source unit in a vertical cross section in a direction perpendicular to the rear plate and the upper plate of the signboard shown in fig. 12 (a).

FIG. 14: an explanatory view showing a light distribution state of the light source unit in a vertical cross section in a direction perpendicular to the back surface plate and the top surface plate of the signboard when the case shown in fig. 11 is used in place of the case shown in fig. 12 and includes the light source unit shown in fig. 13.

FIG. 15: fig. 15(a) is an explanatory view showing a light distribution state of the light source unit in a vertical cross section in a direction perpendicular to the back plate and the top plate of the signboard including another conventional light source unit, and fig. 15(b) is an illuminance distribution diagram of the signboard shown in fig. 15 (a).

FIG. 16: fig. 16(a) is a perspective view showing a structure of a signboard according to a comparative example with respect to the signboard shown in fig. 10, fig. 16(b) is a perspective view showing a structure of one light source unit of the signboard shown in fig. 16(a), fig. 16(c) is a vertical sectional view of the light source unit shown in fig. 16(b), fig. 16(d) is an explanatory view showing a light distribution state of the light source unit shown in fig. 16(c), and fig. 16(e) is a view showing a light distribution characteristic of the light source unit shown in fig. 16 (c).

FIG. 17: an explanatory view showing a light distribution state of the illumination device in a vertical cross section in a direction perpendicular to the back panel and the top panel of the signboard shown in fig. 16 (a).

FIG. 18: in another embodiment of the present invention, a showcase in which the lighting device shown in fig. 9 is included is a vertical sectional view.

FIG. 19: a vertical sectional view of a showcase according to a comparative example with respect to the showcase shown in fig. 18 is shown.

FIG. 20: a vertical sectional view of a showcase according to another comparative example with respect to the showcase shown in fig. 18 is shown.

FIG. 21: in another embodiment of the present invention, a cross-sectional view of a display case of a reach in form containing the lighting device shown in fig. 9 inside.

FIG. 22: a cross-sectional view showing a configuration of a showcase according to a comparative example with respect to the showcase shown in fig. 21.

FIG. 23: a cross-sectional view showing a configuration of a showcase according to another comparative example with respect to the showcase shown in fig. 21.

FIG. 24: fig. 24(a) is a perspective view showing a state in which a theft-proof lamp using the illumination device shown in fig. 9 is attached to a columnar member, fig. 24(b) is an explanatory view showing a light distribution state of the illumination device used in the theft-proof lamp shown in fig. 24(a), and fig. 24(c) is an illuminance distribution diagram of the theft-proof lamp shown in fig. 24 (a).

FIG. 25: fig. 25(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is 0 degree, the reflection surface of the reflection plate is a mirror surface, and the light emitting portion emits light in 3 planes, and fig. 25(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 26: fig. 26(a) is a view showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is-10 degrees, the reflection surface of the reflection plate is a mirror surface, and the light emitting portion emits light in 3 planes, and fig. 26(b) is a schematic view showing the configuration of the illumination device.

FIG. 27 is a schematic view showing: fig. 27(a) is a view showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is-20 degrees, the reflection surface of the reflection plate is a mirror surface, and the light emitting portion emits light in 3 planes, and fig. 27(b) is a schematic view showing the configuration of the illumination device.

FIG. 28: fig. 28(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is-30 degrees, the reflection surface of the reflection plate is a mirror surface, and the light emitting portion emits light in 3 planes, and fig. 28(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 29: fig. 29(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is +10 degrees, the reflection surface of the reflection plate is a mirror surface, and the light emitting portion emits light in 3-plane, and fig. 29(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 30: fig. 30(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is +20 degrees, the reflection surface of the reflection plate is a mirror surface, and the light emitting portion emits light in 3-plane, and fig. 30(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 31: fig. 31(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is 0 degree, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 3 planes, and fig. 31(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 32: fig. 32(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of-10 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 3 planes, and fig. 32(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 33: fig. 33(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of-20 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 3 planes, and fig. 33(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 34: fig. 34(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of-30 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 3 planes, and fig. 34(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 35: fig. 35(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of +10 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 3 planes, and fig. 35(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 36: fig. 36(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is +20 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 3 planes, and fig. 36(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 37: fig. 37(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is 0 degree, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 2 planes, and fig. 37(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 38: fig. 38(a) is a view showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of-10 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 2 planes, and fig. 38(b) is a schematic view showing the configuration of the illumination device.

FIG. 39: fig. 39(a) is a view showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of-20 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 2 planes, and fig. 39(b) is a schematic view showing the configuration of the illumination device.

FIG. 40: fig. 40(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of-30 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 2 planes, and fig. 40(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 41: fig. 41(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is +10 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 2 planes, and fig. 41(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 42: fig. 42(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is +20 degrees, the reflection surface of the reflector is a milky surface, and the light emitting portion emits light in 2 planes, and fig. 42(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 43: fig. 43(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is 0 degree, the reflection surface of the reflection plate is a mirror surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 43(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 44: fig. 44(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is-10 degrees, the reflection surface of the reflection plate is a mirror surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 44(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 45: fig. 45(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is-20 degrees, the reflection surface of the reflection plate is a mirror surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 45(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 46: fig. 46(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is-30 degrees, the reflection surface of the reflection plate is a mirror surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 46(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 47: fig. 47(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is +10 degrees, the reflection surface of the reflection plate is a mirror surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 47(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 48: fig. 48(a) is a view showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflection plate is +20 degrees, the reflection surface of the reflection plate is a mirror surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 48(b) is a schematic view showing the configuration of the illumination device.

FIG. 49: fig. 49(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is 0 degree, the reflection surface of the reflector is a milky surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 43(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 50: fig. 50(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is-10 degrees, the reflection surface of the reflector is a milky surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 50(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 51: fig. 51(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is-20 degrees, the reflection surface of the reflector is a milky surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 51(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 52: fig. 52(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is-30 degrees, the reflection surface of the reflector is a milky surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 52(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 53: fig. 53(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is +10 degrees, the reflection surface of the reflector is a milky surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 53(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 54: fig. 54(a) is a diagram showing the light distribution characteristics of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is +20 degrees, the reflection surface of the reflector is a milky surface, the light source cover is a chevron shape, and the light emitting portion emits light in 2 planes, and fig. 54(b) is a schematic diagram showing the configuration of the illumination device.

FIG. 55: fig. 55(a) is a view showing a light distribution state of the illumination device according to the embodiment of the present invention in which the reflection surface of the reflector is inclined at an angle of, for example, -10 degrees, the reflection surface of the reflector is a milky white surface, and the light emitting portion emits light in 3 planes, and fig. 55(b) is a schematic view showing a light distribution characteristic of the illumination device shown in fig. 55 (a).

FIG. 56: fig. 56(a) is a diagram showing the configuration of the illumination device according to the embodiment of the present invention in which the inclination angle of the reflection surface of the reflector is-20 degrees, the reflection surface of the reflector is a milky-white surface, and the light-emitting portion emits light in 3 surfaces, fig. 56(b) is an explanatory diagram showing the light distribution state of the illumination device shown in fig. 56(a), and fig. 56(c) is a diagram showing the light distribution characteristics of the illumination device shown in fig. 56 (a).

FIG. 57: fig. 57(a) is an explanatory view showing a light distribution state of an illumination device according to another embodiment of the present invention, and fig. 57(b) is a view showing a light distribution characteristic of the illumination device shown in fig. 57 (a).

FIG. 58: a vertical cross-sectional view of a display case incorporating the lighting device shown in fig. 57.

FIG. 59: fig. 59(a) is an explanatory view showing a relationship between longitudinal and transverse light fluxes emitted from a light emitting portion of the illumination device shown in fig. 5, for example, and fig. 59(b) is an explanatory view showing the relationship between the light fluxes by light distribution characteristics.

FIG. 60: a schematic view showing a modification of the reflector and the light-emitting unit that can be used in the illumination device according to the embodiment of the present invention.

FIG. 61: an explanatory view showing a light distribution state of the LED substrate.

FIG. 62: an explanatory view showing a light distribution state of a conventional light source unit in which the LED substrate shown in fig. 61 is covered with, for example, a milky-white tubular or spherical light source cover is shown.

Detailed Description

[ embodiment mode 1 ]

Embodiments of the present invention are described below with reference to the drawings. Fig. 1 is a longitudinal section showing the configuration of the illumination device of the present embodiment.

(constitution of Lighting device 1)

As shown in fig. 1, the illumination device 1 of the present embodiment includes a light emitting portion 11 and a reflection plate 12. The light emitting unit 11 includes an LED21 serving as a light source, a substrate 22 on which the LED21 is mounted, and a light source cover 23 covering the LED 21.

The light source cover 23 is, for example, milk white, and has a rectangular shape elongated in the forward direction of the LED21 (the direction in which the light distribution of the LED21 is strongest). Therefore, the light emitting unit 11 emits light on three sides, i.e., the front side and the left and right sides. The material of the light source cover 23 is, for example, Diperson corporation (テイジン)

Strain) MKL-3500 ZAL. The same material is applied to the light source cover of the other embodiments.

The reflector 12 is provided on the rear surface of the substrate 22, which is the LED21, and reflects light from the side surface of the light emitting part 11 toward the rear of the light emitting part 11. Therefore, the surface of the reflector 12 is preferably a mirror surface, but may be milky white. In the present embodiment, the reflector 12 has a flat plate shape, and the reflection surface of the reflector 12 is a front surface which is a surface on the LED21 side, and is perpendicular to the front-rear direction of the LED21 (the direction in which the light distribution of the LED21 is strongest).

(operation of Lighting device 1)

Fig. 2(a) is an explanatory view showing a light distribution state of the light emitting part 11 in a state where the reflector 12 is not provided in the illumination device 1 shown in fig. 1, and fig. 2(b) is a view showing a light distribution characteristic of the light emitting part 11 shown in fig. 2 (a). Fig. 3(a) is an explanatory view showing a light distribution state of the illumination device 1 shown in fig. 1, and fig. 3(b) is a view showing a light distribution characteristic of the illumination device 1 shown in fig. 1.

As shown in fig. 2(a), the light emitting unit 11 covers the LED21 with the light source cover 23, and emits a larger light flux in the lateral direction of the LED21 than the light flux emitted in the forward direction of the LED21 from the light source cover 23. Accordingly, as shown in fig. 2(b), the light distribution characteristics of the light emitting unit 11 are relatively stronger in the lateral direction than in the forward direction of the LED21, but the light distribution is not so strong in the oblique forward direction and there is a light distribution in the rearward direction.

On the other hand, since the lighting device 1 includes the reflecting plate 12, light directed rearward of the light emitting portion 11 is reflected by the reflecting plate 12 as shown in fig. 3 (a). Accordingly, as shown in fig. 3(b), the light distribution characteristics of the illumination device 1 are relatively stronger in the lateral direction than in the front direction of the LED21, and the light distribution is strongest in the oblique front direction.

(Lighting device 31 comprising a plurality of LEDs)

Next, a description will be given of the lighting device 31 including the configuration of the lighting device 1 and including the plurality of LEDs 21. Fig. 4 is an exploded perspective view showing a configuration of the lighting device 31 including the configuration of the lighting device 1 and including the LED substrate 24 in which the plurality of LEDs 21 are provided on the substrate 22. Fig. 5(a) is a perspective view of the light-emitting part 11 and the reflector 12 in a state where the LED substrate 24 shown in fig. 4 is covered with the light source cover 23, fig. 5(b) is a vertical sectional view of the light-emitting part 11 and the reflector 12 shown in fig. 5(a), fig. 5(c) is a perspective view of the illumination device 31 in a state where the reflector 12 is attached to the rear surface of the light-emitting part 11, and fig. 5(d) is a vertical sectional view of the illumination device 31 shown in fig. 5 (c).

As shown in fig. 4 and 5, the lighting device 31 includes a plurality of LEDs 21 provided in a row on the LED board 24 of the elongated board 22. The light emitting unit 11 is formed by covering an LED substrate 24 with a light source cover 23 having a rectangular longitudinal section, and is fixed to one surface (reflection surface) of the reflection plate 12.

(advantages of the Lighting devices 1 and 31)

As described above, the

lighting devices

1 and 31 are relatively stronger in light distribution in the lateral direction than in the front direction of the LED21, and are strongest in light distribution in the oblique front direction. Accordingly, when the

lighting devices

1 and 31 are disposed in a signboard or a showcase, for example, a wide area can be irradiated due to the light distribution characteristics, and the illumination is performed in a state where the illuminance unevenness is small, and the light source has no granular sensation or little unevenness, so that the glare and the light unevenness are less likely to occur, and the favorable illumination can be obtained. Further, since the

lighting devices

1 and 31 have a simple structure in which the reflection plate 12 is attached to the light emitting portion 11, they can be easily manufactured and have a low cost structure.

In the

lighting devices

1 and 31, the LEDs 21 are covered with the light source cover 23, and therefore, the following advantages are provided. Fig. 6(a) is an explanatory view of a case where the reflected light of the light emitted from the LED21 enters the eye 25 in a state where the LED substrate 24 of the illumination device 31 is not covered with the light source cover 23 and the reflection plate 41 is not present, and fig. 6(b) is an explanatory view of a case where the reflected light of the light emitted from the light emitting portion 11 of the illumination device 31 enters the eye 25.

As shown in fig. 6(a), in the case where the LED substrate 24 is not covered with the light source cover 23 in the lighting device 31, for example, the outer surface 26 of the product is partially and strongly irradiated with the LED 21. Therefore, if the light emitted from the LED21 is reflected by the outer surface of the product 105 and enters the eyes 25 of the user, the user is likely to feel dazzling and the characters of the product or the like are difficult to see.

In contrast, the light emitting portion 11 of the lighting device 31 is such that the LED substrate 24 is covered with the light source cover 23 and emits light on the surface of the light source cover 23. Further, the light directed in the rear direction is reflected by the reflection plate 12. Thereby, as shown in fig. 6(b), the outer surface 26 of the product is substantially uniformly irradiated by the lighting device 31. Therefore, even if the light emitted from the light emitting portion 11 is reflected by the outer surface of the product 105 and enters the eyes 25 of the user, the user does not feel dazzling and does not become hard to see characters and the like of the product.

[ embodiment 2 ]

Other embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of Lighting device 2)

Other embodiments of the present invention will be described below with reference to the drawings. Fig. 7(a) is an explanatory view showing the configuration and the light distribution state of the illumination device 2 of the present embodiment, and fig. 7(b) is a view showing the light distribution characteristics of the illumination device 2 shown in fig. 7 (a). Fig. 7(a) shows a vertical cross section of the structure of the illumination device 2.

As shown in fig. 7(a), the illumination device 2 of the present embodiment includes a reflection plate 41 instead of the reflection plate 12 of the illumination device 1. The other components are the same as those of the lighting device 1.

The reflector 41 of the illumination device 2 is formed in a shape along the rear direction of the LED21 (the direction in which the light distribution of the LED21 is strongest) rather than the shape of the reflector 12 of the illumination device 1 being a flat plate (perpendicular to the front-rear direction of the LED21 (the direction in which the light distribution of the LED21 is strongest and the opposite direction). Specifically, the reflector 41 is bent backward at positions corresponding to both end edges of the light source cover 23 on the reflector 41 side.

As a result, as shown in fig. 7(b), the light distribution characteristics of the illumination device 2 are relatively stronger in the lateral direction than in the front direction of the LED21 and strongest in the oblique front direction, as in the case of the illumination device 1. The position of the maximum intensity of the light distribution in the oblique front direction is slightly moved to the rear side (lateral direction) than in the case of the illumination device 1.

(Lighting device 32 comprising a plurality of LEDs)

Next, a description will be given of the lighting device 32 including the configuration of the lighting device 2 and including the plurality of LEDs 21. Fig. 8 is an exploded perspective view showing a configuration of the lighting device 32 including the configuration of the lighting device 2 and including the LED substrate 24 in which a plurality of LEDs 21 are provided on the substrate 22. Fig. 9(a) is a perspective view of the light emitting section 11 and the reflecting plate 41 in a state where the LED substrate 24 shown in fig. 8 is covered with the light source cover 23, fig. 9(b) is a perspective view showing the illumination device 32 in a state where the reflecting plate 41 is attached to the rear surface of the light emitting section 11, and fig. 9(c) is a longitudinal sectional view of the illumination device 32 shown in fig. 9 (b).

As shown in fig. 8 and 9, in the illumination device 32, the light emitting portion 11 is formed by covering the LED substrate 24 with the light source cover 23 having a rectangular longitudinal section, and is fixed to one surface (reflection surface) of the reflection plate 12, similarly to the illumination device 31.

(advantages of the Lighting devices 2 and 32)

As described above, the

illumination devices

2 and 32 are opposite to each other, and have a stronger light distribution in the lateral direction and a strongest light distribution in the oblique forward direction than the light distribution in the forward direction of the LED21, similarly to the illumination device 1. Further, the position of the maximum intensity of the light distribution in the oblique forward direction is slightly moved rearward (in the lateral direction) than in the case of the illumination device 1.

As a result, similarly to the case of the

lighting devices

1 and 31, when the

lighting devices

2 and 32 are disposed in, for example, a signboard or a showcase, it is difficult for a granular sensation, glare, and light unevenness of the light source to occur, and it becomes possible to realize favorable lighting. Further, since the

lighting devices

2 and 32 have a simple structure in which the reflecting plate 41 is attached to the light emitting unit 11, they can be manufactured easily and can be configured at low cost.

[ embodiment 3 ]

Another embodiment of the present invention will be described below based on the drawings. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of signboard 51)

Here, a description will be given of a configuration example of a signboard including the illumination device of the present embodiment therein. Fig. 10(a) is a perspective view of a signboard including the illumination device 32 shown in fig. 9 therein, fig. 10(b) is a vertical cross-sectional view showing an installation state of the illumination device of the signboard 51, and fig. 10(c) is an illuminance distribution diagram (in lux) of the signboard shown in fig. 10 (a).

As shown in fig. 10(a), the signboard 51 includes a rectangular parallelepiped box-shaped case 52. The vertical direction of the signboard 51 corresponds to the usage form of the signboard 51, and is the longitudinal direction or the short direction of the housing 52, but here, the explanation is given as the short direction of the housing 52. The case 52 has a shape larger in the lateral direction and the vertical direction than in the front-rear direction.

The case 52 includes a back panel 52a, a front panel 52b, an upper panel 52c, a lower panel 52d, a right panel 52e, and a left panel 52 f. Inside the case 52, the lighting device 32 is attached in a state where the longitudinal direction of the rear plate 52a is along the longitudinal direction of the rear plate 52a at the center of the rear plate 52 a. As shown in fig. 10(a) and (b), the lighting device 32 is fixed in a state where the reflector 41 is pressed against the back plate 52a by the fixing member 53 screwed to the back plate 52 a.

(actions and advantages of the Lighting device 32 of the signboard 51)

Fig. 11 is an explanatory diagram showing a light distribution state of the illumination device 32 in a vertical cross section in a direction perpendicular to the back surface plate 52a and the top surface plate 52c of the signboard 51.

As shown in fig. 11, the light distribution characteristics of the illumination device 32 are such that the light distribution in the lateral direction of the light source cover 23 is stronger and the light distribution in the oblique forward direction is strongest than the light distribution in the forward direction of the light source cover 23 (forward direction of the LED 21). This is as detailed by fig. 7. Therefore, even in the case where the signboard 51 includes only one (single) lighting device 32, the upper region 52g2 corresponding to the upper portion of the front panel 52b is in a sufficiently bright state, and the upper corner region 52g3 formed by the upper panel 52c and the front panel 52b is also in a bright state. In addition, the front area 52g1 of the front panel 52b corresponding to the front surface of the illumination device 32 is not too bright, and is in a state of less brightness unevenness. Thus, the illumination device 32 can be made to illuminate the signboard 51 well with less granular sensation, glare, and light unevenness of the light source. The state where the unevenness of light of the signboard 51 is small can be also understood from the illuminance distribution shown in fig. 10 (c).

Further, as described above, the illumination device 32 is of low cost construction. In addition, the number of the lighting devices 32 required for the signboard 51 can be small (1 in the present embodiment), and the number of the wiring lines can be reduced because the lighting devices 32 can be easily mounted in the case 52. This enables the signboard 51 to be manufactured simply and at low cost.

In the present embodiment, the explanation is made on the case where the signboard 51 includes the illumination device 32, but the signboard 51 may include the illumination device 31. Even in this case with the same advantages. This point is also the same in other embodiments described below.

Comparative example 1

A comparative example with respect to the signboard 51 shown in fig. 10 will be described below. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of signboard 61)

Fig. 12(a) is a perspective view showing a structure of the signboard 61 according to a comparative example with respect to the signboard 51 shown in fig. 10, fig. 12(b) is a vertical sectional view showing a state in which the light source unit 305 of the signboard 61 is mounted, and fig. 12(c) is a distribution diagram showing illuminance of the signboard 51 shown in fig. 12 (a). Fig. 12(c) is a diagram showing the same light flux as fig. 10 (a).

As shown in fig. 12(a), the signboard 61 includes a case 62, and a light source unit 305 shown in fig. 62 is mounted inside the case 62 instead of the illumination device 32 of the signboard 51. The case 62 includes a back panel 62a, a front panel 62b, an upper panel 62c, a lower panel 62d, a right panel 62e, and a left panel 62f corresponding to the back panel 52a, the front panel 52b, the upper panel 52c, the lower panel 52d, the right panel 52e, and the left panel 52f of the case 52. The distance between the back plate 62a and the front plate 62b of the case 62 is longer than the distance between the back plate 52a and the front plate 52b of the case 52. The other dimensions of the case 62 are the same as those of the case 52.

The light source unit 305 is disposed inside the tubular light source cover 304, includes the LED substrate 24, and is disposed at the same position as the lighting device 32 of the signboard 51, similarly to the lighting device 32. As shown in fig. 12(a) and (b), the light source unit 305 is attached to the back plate 62a by a holder 63 provided on the back plate 62 a.

(operation of

light source units

305, 306 of

signboards

61, 71, 81)

Fig. 13 is an explanatory diagram showing a light distribution state of the light source unit 305 in a vertical cross section in a direction perpendicular to the back surface plate 62a and the top surface plate 62c of the signboard 61. Fig. 14 is an explanatory diagram showing a light distribution state of the light source unit 305 in a vertical cross section in a direction perpendicular to the back surface plate 52a and the top surface plate 52c of the signboard 71 in a case where the light source unit 305 is included and the same box 52 as the signboard 51 is used instead of the box 62.

As shown in the light distribution characteristic diagram 62 of the light source section 305, the light distribution in the front direction is stronger than the light distribution in the lateral direction when viewed from the center of the light source section 305. Therefore, as shown in fig. 13, the upper region 62g2 corresponding to the upper portion of the front panel 62b of the signboard 61 and the upper region 62g3 corresponding to the upper panel 62c are darkened. On the other hand, the front region 62g1 corresponding to the front surface of the light source section 305 of the front panel 62b is particularly bright. Therefore, the signboard 61 is in a state where there is much brightness unevenness (light unevenness). In addition, the state in which the signboard 61 has a large unevenness of light can be understood by comparing the illuminance distribution of the signboard 61 shown in fig. 12(c) with the illuminance distribution of the signboard 51 shown in fig. 10 (c).

As shown in fig. 14, the distance between the rear panel 52a and the front panel 52b of the case 52 is shorter than the distance between the rear panel 62a and the front panel 62b of the case 62 by using the signboard 71 of the case 52 instead of the case 62, including the light source unit 305. Therefore, the upper region 52g2 and the upper corner region 52g3 are darker, and the bright state of the front region 52g1 is more remarkable than that of the signboard 61. From the above results, it is not appropriate to use the light source section 305 as the lighting device of the signboard.

In the configuration shown in fig. 13, the light distribution state of the signboard 81 including the conventional light source unit 306 instead of the light source unit 305 is as shown in fig. 15 (a). Fig. 15(a) is an explanatory view showing a light distribution state of the light source unit 306 in a vertical cross section in a direction perpendicular to the back surface plate 62a and the top surface plate 62c of the signboard 81 including another conventional light source unit 306, and fig. 15(b) is an illuminance distribution diagram of the signboard shown in fig. 15 (a). Fig. 15(b) is a diagram showing the same light flux as fig. 10 (a). The light source unit 306 is configured to include the LED substrate 204 and cover the LED substrate 204 with a transparent light source cover 307 that does not affect the light distribution, similarly to the light source unit 305.

As shown in the light distribution characteristic diagram 61 of the light source unit 306, the light distribution characteristics are the same as those of the LED 301. Therefore, the upper region 62g2 and the upper region 62g3 are darker and the front region 62g1 is brighter than the signboard 61 including the light source unit 305. Therefore, the signboard 81 has a state where the brightness unevenness (light unevenness) is more increased than that of the signboard 61. In addition, the state in which the light unevenness of the signboard 81 is more increased can be understood by comparing the illuminance distribution of the signboard 81 shown in fig. 15(b) with the illuminance distribution of the signboard 51 shown in fig. 10 (c).

Comparative example 2

(constitution of signboard 91)

Fig. 16(a) is a perspective view showing a structure of the signboard 91 according to a comparative example with respect to the signboard 51 shown in fig. 10, fig. 16(b) is a perspective view showing a structure of one light source unit 94 of the signboard 91, fig. 16(c) is a vertical sectional view of the light source unit 94 shown in fig. 16(b), fig. 16(d) is an explanatory view showing a light distribution state of the light source unit 94 shown in fig. 16(c), and fig. 16(e) is a view showing a light distribution characteristic of the light source unit 94 shown in fig. 16 (c).

As shown in fig. 16(a), the signboard 91 includes a case 92, and a lighting device 93 is mounted inside the case 92. The box body 92 includes a back panel 92a, a front panel 92b, an upper panel 92c, a lower panel 92d, a right panel 92e, and a left panel 92 f.

The illumination device 93 is configured by connecting a plurality of light parts 94 in series, for example. As shown in fig. 16(b) and (c), the light source unit 94 includes a substrate 95, an LED97 provided on the substrate 95, and a lens 96 covering the LED 97. The structure of the light source section 94 corresponds to the structure of the light emitting section disclosed in patent document 2.

Light source units 94 are fixed to back surface plate 92a by screws 98 provided on substrate 95, and light source units 94 are connected to each other via connection portions 99 included in substrate 95 and wiring 100 connected to connection portions 99.

(operation of the illumination device 93 of the signboard 91)

Fig. 17 is an explanatory diagram showing a light distribution state of the illumination device 93 in a vertical cross section in a direction perpendicular to the rear plate 92a and the upper plate 92c of the signboard 91.

As shown in fig. 16(d) and (e), the light distribution characteristics of the light source unit 94 are such that, when viewed from the center of the light source unit 94, the light distribution in the lateral direction is stronger than the light distribution in the forward direction. Therefore, the illuminator 93 can illuminate the signboard 91 shown in fig. 17 with relatively good brightness with little unevenness.

However, since the light source section 94 covers the LEDs 94 separately with lenses, the number of manufacturing steps for manufacturing the lighting device 93 increases, and the component cost increases. In addition, in the case of the configuration in which the signboard 91 is provided with a plurality of light source units 94, mounting of the light source units 94 and electrical connection between the light source units 94 becomes complicated, and a long time is required for manufacturing the signboard 91. Therefore, the signboard 91 becomes an expensive item.

[ embodiment 4 ]

(constitution of showcase 101)

Here, a configuration example of the showcase 101 including the illumination device 32 of the present embodiment will be described. Fig. 18 is a vertical sectional view of a showcase 101 in which the lighting device 32 shown in fig. 9 is included.

As shown in fig. 18, the showcase 101 includes a 1 st shelf 102 from the bottom to the first stage and a 2 nd shelf 103 from the bottom to the 2 nd stage, and an upper plate portion 104 is provided above the 2 nd shelf 103. The 1 st shelf 102, the 2 nd shelf 103, and the upper plate 104 are formed of, for example, iron plates. A plurality of products 105 are disposed on the 1 st booth 102 and the 2 nd booth 103. The 1 st shelf 102, the 2 nd shelf 103, and the upper plate 104 include downward

bent portions

102a, 103a, and 104a bent downward at the front (commodity takeout) end portions. Only the lower bent portion 104a of the upper plate portion 104 is a translucent member, for example, a shade (shade) formed of a milky translucent member, and is a portion that is brightly illuminated to the customer.

A1 st lighting device 32a for illuminating the merchandise 105 on the 1 st shelf 102 is provided on the lower surface of the 2 nd shelf 103, and a 2 nd lighting device 32b for illuminating the merchandise 105 on the 2 nd shelf 103 is provided on the lower surface of the upper plate portion 104. The 1 st and 2

nd lighting devices

32a and 32b are both the lighting device 32 shown in fig. 9 described above.

In the present embodiment, the 1 st illumination device 32a is disposed in the central portion in the front-rear direction of the lower surface of the 2 nd shelf 103, with the width direction of the 1 st and 2

nd shelves

102 and 103 being the long direction. The 2 nd illumination device 32b is disposed at a position on the commodity takeout side with respect to the central portion in the front-rear direction of the lower surface of the upper plate portion 104, with the width direction of the 1 st and 2

nd shelves

102 and 103 being the long direction.

(operation and advantages of Lighting device 32 of showcase 101)

As shown in fig. 18, the light distribution characteristics of the illumination device 32 are, as described above, such that the light distribution in the lateral direction of the light source cover 23 is stronger and the light distribution in the oblique forward direction is strongest than the light distribution in the forward direction of the light source cover 23 (forward direction of the LED 21). Therefore, the 1 st lighting device 32a, that is, a small number of lighting devices 32 can illuminate the entire product on the 1 st shelf 102 from the product 105 on the back side to the product 105 on the front side on the 1 st shelf 102 brightly. Further, the 1 nd lighting device 32b, that is, the few lighting devices 32 can brightly illuminate the lower bent portion 104a of the upper plate portion 104 and the products 105 on the 2 nd booth 103. This enables the showcase 101 to be manufactured in a short time and at a low cost.

Further, the products 105 illuminated by the 1 st and 2

nd lighting devices

32a and 32b are less likely to have unevenness in brightness, and are less likely to have a flickering feeling in which only a part of the showcase 101 is extremely bright.

Comparative example 3

The following description is directed to a comparative example of the showcase 101 shown in fig. 18. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of showcase 111)

Fig. 19 is a vertical sectional view showing the structure of a showcase 111 according to a comparative example with respect to the showcase 101 shown in fig. 18.

As shown in fig. 19, the showcase 111 is provided with a 1 st light source portion 306a for irradiating the merchandise 105 on the 1 st shelf 102 on the lower surface of the 2 nd shelf 103, and a 2 nd light source portion 306b for irradiating the lower bent portion 104a of the upper plate portion 104 from the inside of the showcase 111 is provided below the upper plate portion 104. The 1 st light source unit 306a is disposed at a position closer to the front side (commodity takeout side) than the center portion in the front-rear direction of the lower surface of the upper plate portion 104, with the width direction of the 1 st and 2

nd shelves

102 and 103 being the long direction. The 2 nd light source unit 306b is disposed below the upper plate portion 104 and at a position facing the lower bent portion 104a and closer to the front (product takeout side) than the central portion in the front-rear direction of the lower surface of the upper plate portion 104, with the width direction of the 1 st and 2

nd shelves

102 and 103 being the long direction. The 1 st and 2 nd

light source units

306a and 306b are the light source unit 306 shown in fig. 15 described above.

(operation of light source 306 of showcase 111)

As described above, the 1 st and 2 nd

light source units

306a and 306b have light distribution characteristics such that the light distribution in the forward direction is relatively larger than the light distribution in the lateral direction. The 1 st light source unit 306a illuminates only the product 105 on the front side (product takeout side) on the 1 st shelf 102, and illuminates the rear product 105 inconspicuously. The 2 nd light source 306b brightly irradiates only the lower curved portion 104a of the upper plate 104, and hardly irradiates the products 105 on the rear surface of the 2 nd booth 103. The same problem applies to the case where the light source section 305 is used instead of the light source section 306. This point is also the same in the following other comparative examples in which the light source unit 306 is used as an illumination device.

Comparative example 4

The following description deals with another comparative example of the showcase 101 shown in fig. 18. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of showcase 121)

Fig. 20 is a vertical sectional view showing the structure of a showcase 121 according to another comparative example with respect to the showcase 101 shown in fig. 18. The showcase 121 has a light source portion 306 added to the showcase 111.

As shown in fig. 20, the showcase 121 includes a 3 rd light source 306c in addition to the 1 st light source 306a, and a 4 th light source 306d in addition to the 2 nd light source 306b below the upper plate portion 104, on the lower surface of the 2 nd shelf 103.

The 3 rd light source 306c is disposed on the rear side of the center portion in the front-rear direction of the lower surface of the 2 nd shelf 103 with the width direction of the 1 st and 2

nd shelves

102 and 103 being the longitudinal direction. The 4 th source 306d is disposed in the center in the front-rear direction of the lower surface of the upper plate 104, with the width direction of the 1 st and 2

nd shelves

102 and 103 being the long direction.

(operation of light source 306 of showcase 121)

In the showcase 121, the 1 st light source unit 306a and the 3 rd light source unit 306c are provided on the lower surface of the 2 nd booth 103, whereby the commodities 105 on the front side (commodity taking-out side) and the rear side on the 1 st booth 102 can be irradiated. Further, by providing the 2 nd light source unit 306b and the 4 th light source unit 306d under the upper plate portion 104, the lower bent portion 104a of the upper plate portion 104 and the commodity 105 on the 2 nd booth 103 can be irradiated. However, in the showcase 121, the central portion in the front-rear direction and the front side and the rear side in the 2 nd booth 103 become uneven in brightness in the state where the 4 th light source portion 306d is irradiated. Further, the showcase 121 requires a plurality of light source units 306, requires a long time for manufacturing, and increases the cost.

[ embodiment 5 ]

(constitution of showcase 131)

Here, a configuration example of the showcase 131 of the reach in type including the lighting device 32 of the present embodiment will be described. Fig. 21 is a cross-sectional view of a showcase 131 of a reach-in type in which the lighting device 32 shown in fig. 9 is included.

As shown in fig. 21, the showcase 131 includes 4 doors 132a to 132d in the front. The 2

doors

132a and 132b facing the left side and the 2

doors

132c and 132d facing the right side are opened outward by being opened in the left-right direction. Of the 4 doors 132a to 132d, the outer 2

doors

132a and 132d are connected to the left and right end edges of the front surface of the showcase 131 by hinges (not shown) provided at the end edges, and the inner 2

doors

132b and 132c are connected to a front pillar 133 provided at the center of the front surface of the showcase 131 by hinges (not shown) provided at the end edges. The showcase 131 accommodates a plurality of commodities 134 such as plastic bottles and tubular beverages.

On the inner surface of front pillar 133, illumination device 32 shown in fig. 9 is provided with the longitudinal direction as the vertical direction.

(operation and advantages of Lighting device 32 of showcase 131)

As shown in fig. 21, the light distribution characteristics of the illumination device 32 are, as described above, such that the light distribution in the lateral direction of the light source cover 23 is stronger and the light distribution in the oblique forward direction is strongest than the light distribution in the forward direction of the light source cover 23 (the forward direction of the LED 21). Therefore, the entire lateral commodities 134 arranged in the front row in the showcase 131 can be efficiently illuminated by 1 lighting device 21, that is, a small number of lighting devices 32. In this case, it is difficult to generate unevenness in brightness or a glittering feeling for each product 134.

Further, since 1 lighting device 32, that is, a small number of lighting devices 32, is mounted on the showcase 131, the showcase 131 can be manufactured in a short time and at a low cost.

Comparative example 5

The following description is directed to a comparative example of the showcase 131 shown in fig. 21. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of showcase 141)

Fig. 22 is a cross-sectional view showing the structure of a showcase 141 according to a comparative example with respect to the showcase 131 shown in fig. 21.

As shown in fig. 22, a showcase 141 has a light source unit 306 shown in fig. 15 as an illumination device, instead of the illumination device 32 shown in fig. 21. Similarly to showcase 131, light source unit 306 is provided on the inner surface of front pillar 133 with the longitudinal direction set to the vertical direction. The other components of the showcase 141 are the same as those of the showcase 131.

(operation of light source 306 of showcase 141)

As shown in fig. 22, the light source unit 306 has light distribution characteristics such that the light distribution in the forward direction is relatively larger than the light distribution in the lateral direction. Therefore, light source unit 306 illuminates only the commodity 134 at the center portion among the commodities 134 in the front row in showcase 141, and does not illuminate the commodities 134 other than the center portion brightly. Therefore, only the products 134 near the center of the front-most products 134 are brightly illuminated and dazzling, and the other products are darker.

Comparative example 6

The following description deals with another comparative example of the showcase 131 shown in fig. 21. For convenience of explanation, members having the same functions as those described in the above embodiments are given the same reference numerals, and the explanation thereof will not be repeated.

(constitution of showcase 141)

Fig. 23 is a vertical sectional view showing a configuration of a showcase 151 according to a comparative example with respect to the showcase 131 shown in fig. 21.

As shown in fig. 23, a showcase 151 is equipped with 2 light source units 306 shown in fig. 15 as lighting devices, instead of the lighting device 32 shown in fig. 21. Similarly to the showcase 131, the 2 light source units 306 are provided on the inner surface of the front pillar portion 133 with the longitudinal direction as the vertical direction. 1 of the 2 light source units 306 is arranged so that the direction in which the light distribution is strongest is directed obliquely leftward and frontward, and the other 1 is arranged so that the direction in which the light distribution is strongest is directed obliquely rightward and frontward. The other components of the showcase 151 are the same as those of the showcase 131.

(operation of 2 light source units 306 of the showcase 151)

As shown in fig. 23, the 2 light source units 305 irradiate obliquely left and right front directions, respectively. The front-most commodities 134 in the showcase 151 are brightly illuminated as a whole. However, since 2 light source units 306 are required for the showcase 151, the number of manufacturing steps for manufacturing the showcase 151 increases, the manufacturing time becomes long, and the component cost increases. Further, since 2 light source units 306 are disposed at appropriate intervals on the inner surface of front pillar 133, light source units 306 are easily visible from the outside of showcase 151. Therefore, the user is likely to feel dazzling in the case of selecting the commodity 134 of the showcase 151, or the like.

[ embodiment 6 ]

(constitution of the anti-theft lamp 171)

Here, a configuration example of the antitheft lamp 171 using the lighting device 32 of the present embodiment will be described. Fig. 24(a) is a perspective view of a state in which the antitheft lamp 171 using the illumination device 32 shown in fig. 9 is attached to the columnar member 172, fig. 24(b) is an explanatory view showing a light distribution state of the illumination device 32 used in the antitheft lamp 171, and fig. 24(c) is an illuminance distribution diagram of the antitheft lamp 171.

The antitheft lamp 171 using the lighting device 32 is attached to the upper portion of the columnar member 172 so that the light emitting portion 11 faces downward. In the present embodiment, the antitheft lamp 171, i.e., the lighting device 32, is attached to the columnar member 172 in a state of being inclined 30 degrees with respect to the horizontal direction (in a state of being inclined 30 degrees with respect to the vertical direction in a direction in which the light distribution of the LED21 is strongest) at a position of a height of 4.5 m. Lighting device 32 may also be covered with a transparent cover to prevent dust, insects, and the like from attaching.

(operation and advantage of the Lighting device 32 of the anti-theft Lamp 171)

The antitheft lamp 171 is a light flux 1500lm that can be sufficiently realized at present with a power consumption of about 10W, and in this case has an illuminance distribution shown in fig. 24 (c).

Here, when the LED board 24 shown in fig. 9(a) is used as a security light in a state where the light source cover 23 and the reflection plate 41 are not attached, a person who enters eyes with light from the security light is subjected to glare by light from the LEDs 21, and glare occurs.

In contrast, in the antitheft lamp 171 using the lighting device 32, the light emitting unit 11 in which the LED substrate 24 is covered with the light source cover 23 emits light, and the reflecting plate 41 reflects light from the rear direction of the light emitting unit 11, so that even when light from the antitheft lamp 171 enters the eyes of a person, the person is not dazzled and glare is less likely to occur.

[ embodiment 7 ]

Here, the light distribution characteristics of the illumination device 31 including the reflection plate 12 (the inclination angle of the reflection surface is 0 degree), the reflection surface of the reflection plate 12 is the mirror surface 12a, and the light emitting part 11 emits light in 3 planes, and the light distribution characteristics of the illumination device 32 including the reflection plate 41 (having an inclination angle), the reflection surface of the reflection plate 41 is the mirror surface 41a, and the light emitting part 11 emits light in 3 planes will be described.

Fig. 25(a) is a diagram showing the light distribution characteristics of the illumination device 31 in which the reflection surface of the reflector is inclined at 0 degree, the reflection surface of the reflector 12 is a mirror surface 12a, and the light emitting section 11 emits light in 3 planes, and fig. 25(b) is a schematic diagram showing the configuration of the illumination device 31.

The illumination device 31 shown in fig. 25(b) is a 3-surface light emitting device in which the front surface and the left and right side surfaces of the light source cover 23 emit light. The reflecting surface of the reflector 12 is perpendicular to the direction in which the light distribution of the LED21 is strongest (the angle to the direction in which the light distribution is strongest is 90 degrees).

Fig. 26(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 100 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, and the light emitting portion 11 emits light in 3 planes, and fig. 26(b) is a schematic diagram showing the configuration of the illumination device 32.

The inclination angle of the reflection surface of the reflection plate 41 is negative, and means that the reflection plate 41 is in a more backward direction than the state of the reflection plate 12. Specifically, as described above, the reflector 41 is curved rearward from the positions corresponding to the two end edges of the light source cover 23 on the reflector 41 side. This point is also the same for other lighting devices described below.

Fig. 27(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 110 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, and the light emitting portion 11 emits light in 3 planes, and fig. 27(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 28(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 120 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, and the light emitting portion 11 emits light in 3-plane, and fig. 28(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 29(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at +10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 80 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, and the light emitting portion 11 emits light in 3-plane, and fig. 29(b) is a schematic diagram showing the configuration of the illumination device 32.

The inclination angle of the reflection surface of the reflection plate 41 is + negative (positive), which means that the reflection plate 41 is in a state of being extended in a forward direction inclined with respect to the state of the reflection plate 12. Specifically, as described above, the reflector 41 is bent forward from the positions corresponding to the two end edges of the light source cover 23 on the reflector 41 side. This point is also the same for other lighting devices described below.

Fig. 30(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of +20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 70 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, and the light emitting portion 11 emits light in 3 planes, and fig. 30(b) is a schematic diagram showing the configuration of the illumination device 32.

From the light distribution of the

illumination devices

31 and 32 described above, if the angle of the reflector (reflector 12 and 41) is in the range from +20 degrees to-30 degrees (the angle in the direction in which the light distribution to the LED21 is the strongest is 70 to 120 degrees), a better light distribution state can be obtained than in the conventional illumination device. However, the angle of the reflecting plate (reflecting plates 12 and 41) is preferably in the range of 0 degrees (including 0 degrees) to-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 90 to 120 degrees). Further, the angle of the reflecting plate (reflecting plates 12 and 41) is preferably in the range from 0 degrees (excluding 0 degrees) to-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is larger than 90 degrees, and is 120 degrees or less).

Further, if the inclination angle of the reflection surface of the reflector 41 is changed gradually from +20 degrees to-30 degrees, the intensity of the light distribution in the lateral direction with respect to the intensity of the light distribution in the forward direction is gradually increased. This point is also the same in other embodiments described below.

Even when the reflecting surface of the reflector 41 is inclined toward the + side, the light distribution characteristics can be more excellent than those of the conventional illumination device if the inclination angle is within the range of +20 degrees.

[ embodiment 8 ]

Here, the light distribution characteristics of the illumination device 31 including the reflector 12 (the inclination angle of the reflection surface is 0 degree), the reflection surface of the reflector 12 is a milky white surface 12b, and the light emitting portion 11 emits light in 3 planes, and the light distribution characteristics of the illumination device 32 including the reflector 41 (having an inclination angle), the reflection surface of the reflector 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 3 planes will be described.

Fig. 31(a) is a diagram showing the light distribution characteristics of the illumination device 31 in which the inclination angle is 0 degrees (the angle to the direction in which the light distribution is strongest is 90 degrees), the reflection surface of the reflector is the milky white surface 12b, and the light emitting portion 11 emits light in 3 surfaces, and fig. 31(b) is a schematic diagram showing the configuration of the illumination device 31.

Fig. 32(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 100 degrees), the reflection surface of the reflection plate 41 is a milky-white surface 41b, and the light emitting portion 11 emits light with 3 surfaces, and fig. 32(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 33(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 110 degrees), the reflection surface of the reflection plate 41 is a milky-white surface 41b, and the light emitting portion 11 emits light with 3 surfaces, and fig. 33(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 34(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 120 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light with 3 surfaces, and fig. 33(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 35(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at +10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 80 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light with 3 surfaces, and fig. 35(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 36(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at +20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 70 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light with 3 surfaces, and fig. 36(b) is a schematic diagram showing the configuration of the illumination device 32.

The preferred angles and more preferred angles of the reflectors (reflectors 12 and 41) determined from the light distribution of the

illumination devices

31 and 32 described above are the same as those described in embodiment 7.

[ embodiment 9 ]

Here, the light distribution characteristics of the illumination device 31 including the reflector 12 (the inclination angle of the reflection surface is 0 degree), the reflection surface of the reflector 12 is a milky white surface 12b, and the light emitting portion 11 emits light in 2 planes, and the light distribution characteristics of the illumination device 32 including the reflector 41 (having an inclination angle), the reflection surface of the reflector 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 2 planes will be described.

Fig. 37(a) is a diagram showing the light distribution characteristics of the illumination device 31 in which the inclination angle is 0 degrees (the angle to the direction in which the light distribution is strongest is 90 degrees), the reflection surface of the reflector 12 is a milky white surface 12b, and the light emitting portion 11 emits light in 2 planes, and fig. 37(b) is a schematic diagram showing the configuration of the illumination device 31.

The lighting device 31 shown in fig. 37(b) is a 2-surface light emitting device in which the front surface of the light source cover 23 is a non-light emitting surface 23a that does not emit light, and the left and right side surfaces emit light (the left and right side surfaces are light emitting surfaces). The reflecting surface of the reflector 12 is perpendicular to the direction in which the light distribution of the LED21 is strongest (the angle to the direction in which the light distribution is strongest is 90 degrees).

Fig. 38(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 100 degrees), the reflection surface of the reflection plate 41 is a milky-white surface 41b, and the light emitting portion 11 emits light in 2-plane, and fig. 38(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 39(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 110 degrees), the reflection surface of the reflection plate 41 is a milky-white surface 41b, and the light emitting portion 11 emits light in 2-plane, and fig. 39(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 40(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 120 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 2-plane, and fig. 33(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 41(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at +10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 80 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 2-plane, and fig. 41(b) is a schematic diagram showing the configuration of the illumination device 32.

Fig. 42(a) is a diagram showing the light distribution characteristics of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at +20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 70 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 2-plane, and fig. 42(b) is a schematic diagram showing the configuration of the illumination device 32.

illumination devices

31 and 32 described above are the same as those described in embodiment 7.

As shown in the present embodiment, when the light source cover 23 is a rectangular parallelepiped light source cover 23, the front surface of the light source cover 23 may be a non-light-emitting surface 23 a. In this way, even in the

illumination devices

31 and 32 in which the 2-plane is light-emitting and the reflection surfaces are the

opalescent surfaces

12b and 41b, the light distribution characteristics having a stronger light distribution in the lateral direction than in the front direction can be realized.

In the present embodiment, as the case where the

lighting devices

31 and 32 emit light in 2-plane, the case where the reflection surfaces of the

reflection plates

12 and 41 are milky-

white surfaces

12b and 41b is shown. However, the reflecting surfaces of the reflecting

plates

12 and 41 in this case may be mirror surfaces 12a and 41 a.

[ embodiment 10 ]

Here, the light distribution characteristics of the lighting device 33 including the reflection plate 12 (the inclination angle of the reflection surface is 0 degree), the reflection surface of the reflection plate 12 being the mirror surface 12a, the light source cover 181 being the mountain shape, and the light emitting portion 182 emitting light in 2-plane, and the light distribution characteristics of the lighting device 34 including the reflection plate 41 (having an inclination angle), the reflection surface being the mirror surface 41a, the light source cover 181 being the mountain shape, and the light emitting portion 182 emitting light in 2-plane will be described.

Fig. 43(a) is a diagram showing the light distribution characteristics of the illumination device 33 in which the inclination angle is 0 degree (the angle to the direction in which the light distribution is strongest is 90 degrees), the reflection surface of the reflection plate 12 is the mirror surface 12a, the light source cover 181 is in the chevron shape, and the light emitting portion 182 emits light in 2-plane, and fig. 43(b) is a schematic diagram showing the configuration of the illumination device 33.

The lighting device 33 shown in fig. 43(b) includes a light source cover 181 having a mountain shape formed by facing side surfaces, and emits light in 2-plane. The peak of the light source cover 181 coincides with the forward direction of the LED21 (the direction in which the light distribution of the LED21 is strongest). The light emitting portion 182 including the light source cover 181 covers the LED substrate 24, similarly to the light emitting portion 11. The reflecting surface of the reflector 12 is perpendicular to the direction in which the light distribution of the LED21 is strongest (the angle to the direction in which the light distribution is strongest is 90 degrees).

Fig. 44(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of-10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 100 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, the light source cover 181 is in a chevron shape, and the light emitting portion 182 emits light in 2-plane, and fig. 44(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 45(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of-20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 110 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, the light source cover 181 is in a chevron shape, and the light emitting portion 182 emits light in 2-plane, and fig. 45(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 46(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 120 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, the light source cover 181 is in a chevron shape, and the light emitting portion 182 emits light in 2-plane, and fig. 46(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 47(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of +10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 80 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, the light source cover 181 is in a chevron shape, and the light emitting portion 182 emits light in 2-plane, and fig. 47(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 48(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of +20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 70 degrees), the reflection surface of the reflection plate 41 is a mirror surface 41a, the light source cover 181 is in a chevron shape, and the light emitting portion 182 emits light in 2-plane, and fig. 48(b) is a schematic diagram showing the configuration of the illumination device 34.

illumination devices

33 and 34 described above are the same as those described in embodiment 7.

As described above, the

illumination devices

33 and 34 according to the present embodiment include the mountain-shaped light source cover 181. In this way, even if the light source cover 181 has a mountain shape, the

lighting devices

33 and 34 have light distribution characteristics close to those of the

lighting devices

31 and 32 including the light source cover 23 having a rectangular parallelepiped shape. This point is also the same as in the

lighting devices

33 and 34 described in embodiment 11 below.

[ embodiment 11 ]

Here, the light distribution characteristics of the illumination device 33 including the reflector 12 (the inclination angle of the reflection surface is 0 degree), the reflection surface of the reflector 12 is the milky white surface 12b, the light source cover 181 is the mountain-shaped, and the light emitting portion 182 emits light in 2-plane, and the light distribution characteristics of the illumination device 34 including the reflector 41 (having an inclination angle), the reflection surface is the milky white surface 41b, the light source cover 181 is the mountain-shaped, and the light emitting portion 182 emits light in 2-plane will be described.

Fig. 49(a) is a diagram showing the light distribution characteristics of the illumination device 33 in which the inclination angle is 0 degree (the angle to the direction in which the light distribution is strongest is 90 degrees), the reflection surface of the reflection plate 12 is a milky white surface 12b, the light source cover 181 is in a chevron shape, and the light emitting portion 182 emits light in 2 planes, and fig. 49(b) is a schematic diagram showing the configuration of the illumination device 33.

Fig. 50(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of-10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 100 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, the light source cover 181 is a mountain-shaped, and the light emitting portion 182 emits light in 2-plane, and fig. 50(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 51(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of-20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 110 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, the light source cover 181 is a mountain-shaped, and the light emitting portion 182 emits light in 2-plane, and fig. 51(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 52(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at-30 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 120 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, the light source cover 181 is in a mountain shape, and the light emitting portion 182 emits light in 2-plane, and fig. 52(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 53(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of +10 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 80 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, the light source cover 181 is a mountain-shaped, and the light emitting portion 182 emits light in 2-plane, and fig. 53(b) is a schematic diagram showing the configuration of the illumination device 34.

Fig. 54(a) is a diagram showing the light distribution characteristics of the illumination device 34 in which the reflection surface of the reflection plate 41 is inclined at an angle of +20 degrees (the angle in the direction in which the light distribution to the LED21 is strongest is 70 degrees), the reflection surface of the reflection plate 41 is a milky white surface 41b, the light source cover 181 is a mountain-shaped, and the light emitting portion 182 emits light in 2-plane, and fig. 54(b) is a schematic diagram showing the configuration of the illumination device 34.

illumination devices

33 and 34 described above are the same as those described in embodiment 7.

[ embodiment 12 ]

(difference in light distribution characteristics due to difference in the state of the reflection surface of the reflector 12, 41)

Fig. 55(a) is an explanatory view showing a light distribution state of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of, for example, -10 degrees, the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 3-plane, and fig. 55(b) is a view showing a light distribution characteristic of the illumination device 32. Fig. 56(a) is a schematic view showing a configuration of an illumination device 32 in which the reflection surface of the reflector 41 is inclined at an angle of-20 degrees, the reflection surface of the reflector 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 3 planes, fig. 56(b) is an explanatory view showing a light distribution state of the illumination device 32, and fig. 56(c) is a view showing a light distribution characteristic of the illumination device 32. Fig. 55(b) shows the light distribution characteristics shown in fig. 32(a) in detail. Fig. 56(a) and 33(b) are the same, and fig. 56(c) and 33(a) are the same.

As is clear from fig. 25 to 54, the light distribution characteristics of the

illumination devices

31 and 32 are different from those of the milky-

white surfaces

12b and 41b when the reflecting surfaces of the reflecting

plates

12 and 41 are the mirror surfaces 12a and 41 a.

Specifically, for example, the light distribution state of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at an angle of-10 degrees, the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light on 3 surfaces is as shown in fig. 55(a), and the light distribution characteristics thereof are as shown in fig. 55 (b). The light distribution characteristics (fig. 26(a)) when the reflecting surface is the mirror surface 41a are particularly strong in the light distribution obliquely forward. In contrast, the light distribution characteristic (fig. 55(b)) in the case where the reflecting surface is the opalescent surface 41b is such that the light distribution in the oblique front direction is not so strong, but the light distribution in the front direction from the oblique front direction is overall strong.

Further, it was also confirmed that the inclination angle with respect to the reflection surface was other inclination angles. The light distribution state of the illumination device 32 in which the reflection surface of the reflection plate 41 is inclined at-20 degrees, the reflection surface of the reflection plate 41 is a milky white surface 41b, and the light emitting portion 11 emits light in 3 planes is as shown in fig. 56(a), and the light distribution characteristics thereof are as shown in fig. 56 (c). The light distribution characteristic in the case where the reflecting surface is the mirror surface 41a (fig. 27 a) is particularly strong in the light distribution obliquely forward direction as in the above case. In contrast, in the light distribution characteristic (fig. 56(b)) in the case where the reflecting surface is the milky white surface 41b, the light distribution in the oblique front direction is not so strong, and the light distribution in the front direction from the oblique front direction is entirely strong, as in the above case.

(constitution of Lighting device 35)

Fig. 57(a) is an explanatory view showing a light distribution state of the illumination device 35 of the present embodiment, and fig. 57(b) is a view showing a light distribution characteristic of the illumination device 35.

As described above, the lighting device 35 can be manufactured while maintaining the two light distribution characteristics by utilizing the difference between the light distribution characteristics in the case where the reflecting surface is the mirror surface 41a and the light distribution characteristics in the case where the reflecting surface is the milky white surface 41 b.

The illumination device 35 includes a reflection plate 41, and the state of the reflection surface on the right side of the reflection plate 41 is different from that of the reflection surface on the left side. Specifically, the reflecting surface of the reflecting plate 41 is, for example, a mirror surface 41a on the right side and a milky white surface 41b on the left side. The other configuration of the illumination device 35 is the same as that of the illumination device 32 described above.

(operation and advantages of the Lighting device 35)

In the illumination device 35, the reflecting surface facing the right side is the mirror surface 41a, and the reflecting surface facing the left side is the milky white surface 41b, so that different light distribution characteristics can be shown on the left and right sides as shown in fig. 57 (c). Specifically, the light distribution of the illumination device 35 is particularly strong in the diagonally forward direction on the right side, and the light distribution becomes less strong in the diagonally forward direction on the left side, but the light distribution of the forward direction from the diagonally forward direction is overall strong. Thus, the illumination device 35 can be used as an illumination device for a place where a light distribution is not uniform on the left and right sides and is preferable.

(constitution of showcase 161 including illumination device 35)

Fig. 58 is a vertical sectional view of a showcase 161 including the lighting apparatus 35 shown in fig. 57. As shown in fig. 58, the upper plate portion 104 of the showcase 161 includes a lower bent portion 104b which is bent downward in an arc shape, instead of the lower bent portion 104a of the showcase 101 shown in fig. 18. The lower curved portion transmits light.

An illumination device 32 for illuminating the merchandise 105 on the 1 st shelf 102 is provided on the lower surface of the 2 nd shelf 103 of the showcase 161, and an illumination device 35 for illuminating the merchandise 105 on the 2 nd shelf 103 and the lower curved portion 104a is provided on the lower surface of the upper plate portion 104. The lighting device 32 is the lighting device 32 shown in fig. 9, and the lighting device 35 is the lighting device 35 shown in fig. 57.

The lighting device 32 is disposed at the center in the front-rear direction of the lower surface of the 2 nd shelf 103 with the width direction of the 2 nd shelf 103 being the long direction. The illumination device 35 is disposed in the vicinity of the lower bent portion 104b with the width direction of the upper plate portion 104 as the longitudinal direction. Specifically, in the illumination device 35, the side of the reflection surface of the opal surface 41b is positioned on the side of the lower bent portion 104 b.

(operation and advantages of the Lighting device 32 of the showcase 161)

In the illumination device 35, the side of the reflection surface of the milky white surface 41b is located on the lower bent portion 104b side, and the side of the reflection surface of the mirror surface 41a is located on the opposite side to the lower bent portion 104b side. Therefore, the illumination device 35 can substantially uniformly irradiate the arc-shaped inner surface of the lower curved portion 104b with the left light distribution, and can favorably irradiate the entire commodity 105 disposed on the 2 nd booth 103 with the right light distribution. The operation of the lighting device 32 and other advantages of the showcase 161 are the same as those of the showcase 101.

(aspect ratio of light beam emitted from the light emitting section 11)

Fig. 59(a) is an explanatory view showing a relationship between longitudinal and transverse light fluxes emitted from the light emitting portion 11 of the illumination device 31, for example, and fig. 59(b) is an explanatory view showing the relationship between the light fluxes by light distribution characteristics.

In light emitting

units

11 and 182 of the illumination devices described in the above embodiments, it is preferable that the ratio of the light beam emitted from light emitting

unit

11 or 182 in the longitudinal direction (in the front direction of LED 21) to the light beam emitted from light emitting

unit

11 or 182 in the lateral direction, that is, the aspect ratio of the light beam, be vertical: the transverse direction is 1: 1 or more (1 or more in the horizontal/vertical direction).

[ embodiment 13 ]

Fig. 60 is a schematic view showing a modification of the reflection plates 12 and 14 and the light emitting unit that can be used in the illumination device of the present embodiment. As shown in fig. 60, the reflection plate 14 may be provided at different angles of inclination in the left and right directions, or may be provided at the front and rear of the light emitting unit 11, for example.

The light source cover is exemplified by a rectangular parallelepiped shape (light source cover 23) and a mountain shape (light source cover 181), and may be, for example, a trapezoidal shape, an oval shape elongated in the front-rear direction, or a shape in which a portion corresponding to a side surface is curved.

In the dimensions of the light source covers 23 and 181 described in the above embodiments, the ratio of the vertical (front) direction to the horizontal (lateral) direction, that is, the vertical/horizontal direction may be 1.5 or more.

In the above embodiment, the front direction of the LED21 (the direction in which the light distribution of the LED21 is the strongest) and the longitudinal direction of the light source covers 23 and 181 are configured to be aligned with each other. However, the LED21 may be provided in a state where the front direction is inclined with respect to the longitudinal direction of the light source covers 23 and 181. That is, even if the front direction of the LED21 does not coincide with the longitudinal direction (front direction) of the

light sources

23 and 181, the above-described desired effects can be obtained with the illumination device of the above embodiment as long as the aspect ratio (horizontal/vertical) of the light beams emitted from the light source covers 23 and 181 is 1 or more.

[ conclusion ]

The illumination device according to aspect 1 of the present invention is an illumination device including a light emitting portion 11 including an LED21 as a light source and a light source cover 23 covering the LED21, wherein the light emitting portion 11 has a lateral/longitudinal direction which is a ratio between a front direction which is a direction of a strongest light distribution of the LED21 and a lateral direction orthogonal to the front direction of a light beam emitted from a surface of the light source cover 23, and includes reflecting members (reflecting plates 12, 41) which are provided on a surface opposite to the front direction of the light emitting portion 11 and reflect light emitted from the light emitting portion 11 in a rear direction of the light emitting portion 11.

According to the above configuration, light emitting portion 11 has a ratio of the direction in which the light distribution of LED21 is strongest, i.e., the front direction, to the lateral direction orthogonal to the front direction, i.e., the lateral/vertical direction, of the light beam emitted from the surface of light source cover 23 of 1 or more, and reflecting member reflects the light emitted from light emitting portion 11 in the rear direction of light emitting portion 11. Therefore, it is possible to effectively use the wasted light emitted from the light emitting portion 11 in the rear direction of the light emitting portion 11, and to enhance the light distribution in the lateral direction and the light distribution in the oblique front direction of the light emitting portion 11. Thus, when the lighting device is disposed in a signboard or a showcase, for example, a granular sensation, glare, and light unevenness of the light source are less likely to occur, and favorable lighting is possible. That is, the illumination device according to an aspect of the present invention can be manufactured at low cost while using an LED as a light source and having good light distribution characteristics, by a simple configuration in which the light emitting unit 11 is provided with a reflective member.

In the irradiation device according to aspect 2 of the present invention, in aspect 1, the reflecting surface of the reflecting member may be at an angle of 90 degrees or more and 120 degrees or less with respect to the front direction.

According to the above configuration, the light emitted from the light source cover 23 in the lateral direction can be reliably intensified in the lateral direction and the oblique forward direction of the light emitting section 11 without being greatly concentrated in the forward direction by the reflecting member.

In the irradiation apparatus according to aspect 3 of the present invention, in aspect 2, the reflecting surface of the reflecting member may be configured such that an angle with respect to the front direction is larger than 90 degrees.

With the above configuration, the light distribution in the lateral direction and the light distribution in the oblique forward direction of the light emitting unit 11 can be further reliably increased.

The irradiation apparatus according to aspect 4 of the present invention may be configured such that, in any one of aspects 1 to 3, the reflecting surface of the reflecting member is milky white.

According to the above configuration, by making the reflection surface of the reflection member milky white, the intensity of the light distribution in the lateral direction and the light distribution in the oblique forward direction of the light emitting section 11 can be slightly relaxed, and the uniformity of the light distribution from the lateral direction to the forward direction can be promoted, as compared with the case where the reflection surface of the reflection member is made to be a mirror surface, for example.

In the illumination device according to aspect 5 of the present invention, in any one of aspects 1 to 3, the reflection surface of the reflection member may be configured such that the reflection state of light is different between the left side and the right side of the light source cover 23 in the lateral direction.

According to the above configuration, the reflection surfaces of the reflection members are different in the light reflection state between the left and right sides of the light source cover 23 in the lateral direction, and therefore the light distribution state between the left and right sides of the light source cover 23 can be appropriately set according to the usage form of the illumination device.

In the illumination device according to aspect 6 of the present invention, in aspect 5, the reflection surface of the reflection member may be a mirror surface on one of the left side and the right side of the light source cover 23 in the lateral direction, and a milky white surface on the other side.

According to the above configuration, depending on the usage form of the illumination device, the light distribution on one side (mirror surface side) of the left and right sides of the light source cover in the lateral direction is made strong in the lateral direction and the oblique front direction, and the light distribution on the other side (opal side) is made slightly moderate in the intensity of the light distribution in the lateral direction and the oblique front direction, so that the uniformity of the light distribution from the lateral direction to the front direction can be promoted.

The signboard of aspect 7 of the present invention includes the lighting device according to any one of aspects 1 to 6.

With the above configuration, the signboard, in which the granular sensation, glare, and light unevenness of the light source are less likely to occur, can be manufactured easily and at low cost.

A showcase according to aspect 8 of the present invention includes the lighting device according to any one of aspects 1 to 6.

With the above configuration, a showcase in which the granular sensation, glare, and light unevenness of the light source are less likely to occur can be manufactured simply and at low cost.

A showcase according to aspect 9 of the present invention includes the lighting device according to any one of aspects 1 to 6.

According to the above configuration, the antitheft lamp in which the granular feeling, glare, and light unevenness of the light source are less likely to occur can be manufactured simply and at low cost.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. Further, new technical features can be formed by combining the technical means disclosed in the respective embodiments.

Description of the main elements

1. 2, 31, 32 lighting device

11 light emitting part

12. 41 reflecting plate

21 LED

22 substrate

23 light source cover

24 LED substrate

51 signboard

52 case body

52a back plate

52b front panel

52c upper panel

52d lower panel

52e Right Panel

52f left panel

53 fixing element

101. 131, 161 show case

171 theft-proof lamp

181 light source cover

182 light emitting part

Claims

1. A lighting device is characterized in that the lighting device comprises a light emitting part including a light source (LED) and a light source cover for covering the LED,

the light emitting section is a light beam emitted from the surface of the light source cover, and the LED has a ratio of the front direction, which is the direction in which the light distribution of the LED is strongest, to the lateral direction orthogonal to the front direction, i.e., the lateral/longitudinal direction, of 1 or more, and

the lighting device includes a reflecting member provided on a surface opposite to the front direction of the light emitting section and reflecting light emitted from the light emitting section in a rear direction of the light emitting section.

2. The illumination device according to claim 1, wherein a reflection surface of the reflection member has an angle of 90 degrees or more and 120 degrees or less with respect to the front direction.

3. A lighting device according to claim 2, wherein a reflecting surface of said reflecting member has an angle larger than 90 degrees with respect to said front direction.

4. A lighting device as recited in any one of claims 1-3, wherein a reflecting surface of said reflecting member is milky white.

5. The lighting device according to any one of claims 1 to 3, wherein the reflecting surface of the reflecting member is different in light reflecting state between a left side and a right side in the lateral direction of the light source cover.

6. The lighting device according to claim 5, wherein the reflecting surface of the reflecting member is a mirror surface on one of left and right sides of the light source cover in the lateral direction, and a milky white surface on the other side.

7. A sign comprising the lighting device according to any one of claims 1 to 6.

8. A showcase characterized by comprising the lighting device according to any one of claims 1 to 6.

9. An antitheft lamp comprising the lighting device according to any one of claims 1 to 6.