JP6722884B2 - Lighting equipment and reach-in showcase - Google Patents

Description

The present invention relates to a lighting device and a reach-in showcase that control light distribution of light emitted from a light source, and particularly to a lighting device that emits light in a display room of the reach-in showcase and a reach-in showcase using the lighting device.

Conventionally, an illuminating device using an LED light source, which is an example of a light source, and a reflecting plate arranged so as to reflect light from the LED light source is known (for example, see Patent Document 1).

JP, 2009-195273, A

However, in the illuminating device described in Patent Document 1, the light from the light source is reflected by the reflecting member to perform the light distribution control, but it is difficult to perform the appropriate light distribution control with the reflecting member. Further, since the reflecting member is used for controlling the light distribution, there is a problem that the cost is increased due to the increase in the number of parts and the structure is complicated due to the increase in the number of parts.

The present invention has been made to solve such a problem, and a lighting device and a reach-in device that can realize a reduction in manufacturing cost due to an increase in the number of parts while performing light distribution control in a desired direction. The purpose is to provide a showcase.

In order to solve the above problems, one mode of an illumination device according to the present invention is a light source that irradiates light, and is disposed so as to cover the light source, transmits incident light, and emits light to the outside. An elongated cover portion, the cover portion extending in the longitudinal direction of the cover portion, two transparent portions transmitting the light of the light source, and the transparent portion sandwiched between the two transparent portions. A light-shielding portion that exists on the optical axis of the light source, extends in the longitudinal direction, and shields the light of the light source; and each of the two light-transmitting portions extends in the longitudinal direction. A plurality of prism portions are formed, each of the plurality of prism portions refracts light of the light source in a direction away from the optical axis, and each of the plurality of prism portions is the light transmitting portion on the light source side. From the inner surface of the, when projecting toward the light source, in a cross-sectional view of the cover portion when cut in a plane that is substantially orthogonal to the longitudinal direction, each of the plurality of prism portions has a substantially triangular shape, The prism portion farther from the optical axis than the prism portion closer to the optical axis has a larger apex angle of the prism portion than the prism portion closer to the optical axis, and from the inner surface to the tip of the prism portion. The height is small.
Further, an illuminating device according to one embodiment of the present invention includes a light source that emits light, and a long cover portion that is disposed so as to cover the light source, transmits the incident light, and emits the light to the outside. And the cover part extends in the longitudinal direction of the cover part and is sandwiched between the two light-transmitting parts that transmit the light of the light source and the two light-transmitting parts on the optical axis of the light source. A plurality of prism parts that extend in the longitudinal direction and that shield the light of the light source, and that each of the two light transmitting parts has a plurality of prism parts that extend in the longitudinal direction. Are formed, each of the plurality of prism portions refracts light of the light source in a direction away from the optical axis, and each of the plurality of prism portions includes the light source side and the light source side so that the light of the light source does not directly enter. It has a second incident surface that does not face the optical axis side.
Further, an illuminating device according to one embodiment of the present invention includes a light source that emits light, and a long cover portion that is disposed so as to cover the light source, transmits the incident light, and emits the light to the outside. And the cover part extends in the longitudinal direction of the cover part and is sandwiched between the two light-transmitting parts that transmit the light of the light source and the two light-transmitting parts on the optical axis of the light source. A plurality of prism parts that extend in the longitudinal direction and that shield the light of the light source, and that each of the two light transmitting parts has a plurality of prism parts that extend in the longitudinal direction. Is formed, each of the plurality of prism portions refracts light of the light source in a direction away from the optical axis, and the light shielding portion is away from the optical axis in a direction orthogonal to the optical axis as the distance from the light source increases. The light-shielding portion is provided on the cover portion so that the distance to the end surface of the light-shielding portion is large, and the light-shielding portion is present on an extension line of a straight line connecting the tip of the prism portion and the light source, which are close to the light-shielding portion. doing.

Further, a reach-in showcase according to an aspect of the present invention includes a lighting device and a display shelf that is disposed in a display room that houses products and displays the products, and the lighting device emits light in the display room. It is arranged so as to be substantially orthogonal to the display shelves so as to illuminate.

According to the present invention, it is possible to realize a reduction in manufacturing cost due to an increase in the number of components while controlling light distribution in a desired direction.

It is a perspective view of the reach-in showcase which concerns on embodiment. FIG. 2 is a cross-sectional view of the reach-in showcase according to the embodiment taken along line II-II of FIG. 1. It is a perspective view of the illuminating device which concerns on embodiment. It is sectional drawing of the illuminating device which concerns on embodiment in the IV-IV line of FIG. It is a partial expanded sectional view of the cover part concerning an embodiment. It is a figure which shows the light distribution curve of the illuminating device which concerns on embodiment. It is a figure which shows the illuminance distribution of the illuminating device which concerns on embodiment. 7 is a diagram showing a light distribution curve of the lighting device according to Comparative Example 1. FIG. 7 is a diagram showing an illuminance distribution of the lighting device according to Comparative Example 1. FIG. FIG. 8 is a cross-sectional view of a cover portion in a lighting device according to Comparative Example 2. It is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 2. It is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 3. It is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 3. 11 is a diagram showing an illuminance distribution of the illumination device according to Comparative Example 3. FIG.

(Findings forming the basis of the present invention)
In the illumination device used in the conventional reach-in showcase, in order to illuminate the display room of the reach-in showcase, the light distribution is controlled in a desired direction by using a reflector, or the optical axis is directed in the desired direction. The light source is arranged and the light distribution is controlled using a reflector.

When controlling the light distribution in a desired direction using a reflector, the reflector is placed on the optical axis to control the light distribution. In this case, spots (luminance spots, color spots) occur in the light distribution. Easy and difficult to control light distribution. Further, in this case, since it is necessary to provide the reflection plate, the reach-in showcase is increased in size and the number of parts is increased, so that the manufacturing cost is increased.

When arranging the light source so that the optical axis faces the desired direction and controlling the light distribution using the reflector, arrange the reflector symmetrically with respect to the optical axis so that the light from the light source does not spread. When the light distribution control is performed, it becomes easier to perform the light distribution control than the above method. However, in this case, since it is necessary to direct the optical axis in a desired direction, the arrangement of the light source complicates the structure of the lighting device.

Thus, the light distribution and illuminance of the lighting device using the reflector will be described with reference to FIGS. 8 and 9.

8: is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 1. FIG. 9: is a figure which shows the illuminance distribution of the illuminating device which concerns on the comparative example 1. FIG. FIG. 9 shows the illuminance distribution in a state in which two lighting devices are arranged in the opening 2c having a vertical length of 1.6 m and a horizontal length of 0.7 m, and the two lighting devices reach-in. The display room of the showcase is being illuminated. FIG. 9 shows the reach-in showcase of FIG. 1 in which two lighting devices each having a length of 1.460 m are vertically erected in a vertical direction with an interval of 0.7 m between them and arranged in parallel so as to face each other. It is the illuminance distribution of the illumination device when measured in.

As shown in FIG. 8, the maximum luminous intensity of the illuminating device using the reflector is about 500 cd, and the light distribution angle is about 45°. The light distribution angle is an angle range in which a light intensity equal to ½ of the maximum light intensity is emitted in the light distribution curve. When the direction of the optical axis is 0°, the angles of the light distribution curve at the maximum luminous intensity are about 80° and about −80°. The shape of the light distribution curve is stubby and rounded. When the light distribution angle is about 45°, in the diagram showing the illuminance distribution shown in FIG. 9, there are large spots near the light source, and the difference in illuminance is large. Therefore, this lighting device has low uniformity. Note that 0° of the angle of the light distribution curve is backward, 90° of the angle of the light distribution curve is leftward, and −90° of the angle of the light distribution curve is rightward.

In view of this, the present invention provides a lighting device and a reach-in showcase that realizes reduction in manufacturing cost due to an increase in the number of parts while controlling light distribution in a desired direction.

Embodiments of the present invention will be described below with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, and the like shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, the constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as arbitrary constituent elements.

It should be noted that each drawing is a schematic view and is not necessarily strictly illustrated. Further, in each drawing, substantially the same configurations are denoted by the same reference numerals, and overlapping description will be omitted or simplified.

(Embodiment)
Hereinafter, a lighting device according to an embodiment of the present invention and a reach-in showcase using the lighting device will be described.

[Constitution]
First, the configuration of the reach-in showcase according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view of a reach-in showcase according to an embodiment. FIG. 2 is a cross-sectional view of the reach-in showcase according to the embodiment taken along line II-II of FIG. FIG. 3 is a perspective view of the lighting device according to the embodiment. FIG. 4 is a cross-sectional view of the illumination device according to the embodiment taken along line IV-IV in FIG. FIG. 5 is a partially enlarged cross-sectional view of the cover portion according to the embodiment.

In FIG. 1, in the reach-in showcase, the direction of the door side is defined as the front direction, the side opposite to the door side is defined as the rear direction, the handle side of the door is defined as the left direction, and the side opposite to the handle side of the door is defined as the right direction. The ground side of the reach-in showcase is defined as the downward direction, and the side opposite to the downward direction is defined as the upward direction. Further, in FIG. 2, in the reach-in showcase, the direction on the door side is defined as the front direction, and the side opposite to the door side is defined as the rear direction, and front, rear, left, right, and up and down directions are displayed. Then, the respective directions shown in the respective figures after FIG. 3 are all displayed in correspondence with the respective directions shown in FIG. In addition, in FIG. 1, the up-down direction, the left-right direction, and the front-rear direction change depending on the usage mode, and are not limited thereto. The same applies to subsequent figures.

As shown in FIG. 1, the reach-in showcase 1 is a box in which foods and the like can be refrigerated and frozen. The reach-in showcase 1 is a low-temperature showcase with a door 3 installed in, for example, a supermarket or a convenience store.

The reach-in showcase 1 has a main body 2 in which a display room 2a is provided, three doors 3 that can be opened and closed with respect to the main body 2, and four lighting devices 5 shown in FIG. There is.

The main body 2 includes a cooling device configured by a compressor or the like for cooling the display room 2a, a control unit that controls the cooling device, a power supply unit that supplies electric power from system power to the cooling device, the control unit, and the like. It is housed. In the display room 2a of the main body portion 2, a plurality of display shelves 2b for displaying foods and the like are installed. The bottom of the display room 2a is also the display shelf 2b. The display room 2a is provided with a rectangular opening 2c which is open to the front and allows food and the like to be carried in from the outside. The opening 2c is divided into three by four long columns 2d extending from the lower end to the upper end of the opening 2c. The column 2d is assembled to the main body 2. Each of the four openings 2c has substantially the same size, shape, and the like.

Each of the three doors 3 includes a glass plate 3a through which the display room 2a can be seen through, and a frame 3b that supports the glass plate 3a, so that the three openings 2c on the front surface of the display room 2a can be opened and closed one to one. It is provided. Each of the three doors 3 has substantially the same size and shape. The frame 3b is rotatably supported by the column 2d via a hinge or the like. When closing the opening 2c, the frame 3b is in close contact with the front surface of the column 2d to close the opening 2c of the display room 2a.

As shown in FIG. 2, the four lighting devices 5 are arranged in a one-to-one correspondence with the four columns 2d. When the reach-in showcase 1 is viewed from the front, the lighting device 5 is arranged on the rear surface of the pillar 2d so as to overlap the pillar 2d. The illuminating device 5 is long in the vertical direction and mainly irradiates light in the horizontal direction.

As shown in FIGS. 2 and 3, the lighting device 5 includes a fixture body 50, two end caps 51, and a light emitting unit 70.

The fixture body 50 has a long tubular shape, and is a member that serves as a base of the lighting device 5. The instrument body 50 is open at the top and bottom. The fixture body 50 is provided with a connector (not shown) that is electrically connected to the lighting device 5. By fitting the lighting device 5 into the connector, the electric power required for the light emission of the lighting device 5 is supplied to the power supply unit (not shown) of the fixture body 50.

End caps 51 are attached to both ends of the device body 50 in the vertical direction. The end cap 51 is made of synthetic resin, is fixed to the instrument body 50 by engaging with the engaging portion of the instrument body 50, and closes both ends of the instrument body 50.

In the present embodiment, operations such as turning on, turning off, and dimming the lighting device 5 are performed through the operation panel provided in the fixture body 50, but via a remote control device independent of the reach-in showcase 1. Operations may be performed. In such a case, a control line for exchanging signals between the operation panel and the lighting device 5 is connected to the lighting device 5.

The instrument main body 50 is an optical member having a light-transmitting property except for a light-shielding portion 63 which will be described later, and is made of a light-transmitting material such as a transparent resin material such as acrylic or polycarbonate or a glass material. The instrument main body 50 is integrally formed by a two-color molding (an example of multi-color molding) with a housing portion 53 described later, two light transmitting portions 61 described below, and a light shielding portion 63 provided between the light transmitting portions 61. Are molded in a proper way. In the present embodiment, the two light-transmitting portions 61 and the light-shielding portions 63 are made of the same material, that is, polycarbonate, but polycarbonates having different properties are used. Note that different materials may be used for the two light transmitting portions 61 and the light shielding portions 63.

The method of manufacturing the instrument body 50 is not particularly limited, but a method of manufacturing by extrusion molding is preferable. In the case of manufacturing by extrusion molding, the transparent resin material is heated, melted, and kneaded by an extruder, and extruded through an extrusion die provided at the exit of the extruder, and a sizing plate, a sizing die, and a water tank were provided. By cooling and solidifying while shaping into the final cross-sectional shape in the sizing and cooling zone, it is possible to obtain the instrument main body 50 having a desired shape.

As shown in FIG. 3, the instrument body 50 has a housing portion 53 and a cover portion 60.

The housing portion 53 and the cover portion 60 are integrated, and the housing portion 53 is the rear side of the cover portion 60. The rear surface of the housing portion 53 is attached to the column 2d.

As shown in FIG. 4, the instrument body 50 will be described below in a case where the instrument body 50 is cut along a plane defined by the left-right direction and the front-rear direction and is cross-sectionally viewed. On the inner surface of the accommodating portion 53, a plurality of vertically elongated protrusions having a triangular shape in a sectional view are formed.

The accommodating portion 53 accommodates the light emitting unit 70, a control circuit, a control line, a power supply unit that supplies electric power to the light emitting unit, and the like. A pair of left and right slide support parts 51 a for fixing the light emitting part 70 and the like are provided on the inner surface of the housing part 53. The pair of left and right slide support portions 51a are two protrusions protruding from the inner surface of the accommodating portion 53 at predetermined intervals like rails. The light emitting portion 70 and the like are attached to the housing portion 53 by sliding them on the pair of left and right slide support portions 51a.

The power supply unit includes a power supply circuit that generates electric power for causing the light emitting unit 70 to emit light. The power supply unit rectifies, smoothes, and steps down AC power from an external power supply such as a commercial power supply to convert it into DC power of a predetermined level, and supplies the DC power to the light emitting unit 70. The power supply unit is electrically connected to a commercial power supply via the power supply unit of the reach-in showcase 1 by a power line such as a control line.

The light emitting unit 70 is a light emitting module that is in the form of a plate that is long in the vertical direction, has a plurality of light sources 71, and a substrate 72 on which each light source 71 is arranged, and that is capable of dimming control and toning control. ..

The light sources 71 are mounted on the substrate 72 so as to be arranged in a line. The light source 71 is a so-called SMD (Surface Mount Device) type LED element. Specifically, the SMD type LED element is a package type LED element in which an LED chip (light emitting element) is mounted in a resin-molded cavity and a phosphor-containing resin is enclosed in the cavity. The light source 71 is turned on and off by being controlled by a control circuit provided in the lighting device 5. Further, in each light source 71, the control circuit controls the power supply unit to perform dimming and toning.

The light source 71 is not limited to such a configuration, and a COB (Chip On Board) type light emitting module in which an LED chip is directly mounted on the substrate 72 of the light source 71 may be used. .. Further, the light emitting element included in the light source 71 is not limited to the LED, and for example, a semiconductor light emitting element such as a semiconductor laser or other solid light emitting element such as an organic EL (Electro Luminescence) or an EL element such as an inorganic EL. May be

The substrate 72 is a mounting substrate for mounting the plurality of light sources 71, and is, for example, a ceramic substrate, a resin substrate, or an insulating-coated metal base substrate. Further, the substrate 72 is, for example, a plate shape having a flat surface that is rectangular in plan view. It should be noted that the substrate 72 is formed with a pair of electrode terminals (a positive electrode terminal and a negative electrode terminal) for receiving DC power for causing the light source 71 to emit light from the outside.

The surface of the substrate 72 opposite to the side (rear side) on which the light source is mounted is fixed to the mounting plate 73. Both end edges of the mounting plate 73 are supported by a pair of left and right slide support portions 51a so as to be sandwiched in the vertical direction.

The cover portion 60 is a member that is long in the vertical direction and transmits the light emitted from the light source 71. Further, in the present embodiment, the cover section 60 has a function of controlling the light distribution of the light emitted from the light source 71 in a predetermined direction.

The cover portion 60 is provided on the instrument body 50 so as to cover the light source 71 and the like attached to the instrument body 50. The cover portion 60 has an arc shape when viewed in cross section. The cover portion 60 has two elongated light transmitting portions 61 and an elongated light shielding portion 63.

Each of the two light transmitting portions 61 is a member that transmits the light emitted from the light source 71. Each of the two light transmitting portions 61 sandwiches the light shielding portion 63 and is arranged symmetrically with respect to the optical axis X1. On the other hand, the light-transmitting part 61 on the one side (left side) extends from the left end of the light-shielding part 63 toward the left front side so as to draw an arc centered on the light source 71 side. The other (right side) light transmitting portion 61 extends from the right end of the light shielding portion 63 toward the front right side so as to draw an arc centered on the light source 71 side. That is, the light-transmitting portion 61 on the left side and the light-transmitting portion 61 on the right side are arranged symmetrically with respect to a plane defined by the vertical direction and the horizontal direction. Each of the two light-transmitting portions 61 is a cross-sectional view of the light-transmitting portion 61 when cut along a plane (a plane defined by the left-right direction and the front-back direction) substantially orthogonal to the vertical direction (an example of the longitudinal direction). , Has an arc shape.

An entrance surface 61a and an exit surface 61b are formed in each of the two light transmitting portions 61.

The incident surface 61a is an inner surface of each of the two light transmitting portions 61 on which the light from the light source 71 is incident. The emitting surface 61b is an outer surface of each of the two light transmitting portions 61 from which the light from the light source 71 is emitted.

A plurality of prism portions 62 projecting toward the light source 71 are formed on the incident surface 61 a side of each of the two light transmitting portions 61. In the present embodiment, two prisms 62 are formed on each of the two light transmitting parts 61. The right prism portion 62 is long in the vertical direction, and is formed so as to be aligned in the direction away from the light shielding portion 63 (rightward direction). The left prism portion 62 is long in the up-down direction, and is formed so as to be aligned in the direction away from the light shielding portion 63 (left direction). Each of the plurality of prism portions 62 has a substantially triangular shape and is arranged in a triangular wave shape. As shown in FIG. 5, in the prism portion 62, the apex angle θ of the prism portion 62 increases as the distance from the optical axis X1 increases, and the height from the incident surface 61a to the tip of the light transmitting portion 61 gradually decreases. Moreover, the width in the lateral direction is increased. The apex angle θ of the prism portion 62 is an angle that intersects on an extension surface of a first incident surface 62a described later and a second incident surface 62b described later in a sectional view. In addition, in the present embodiment, two prisms 62 are formed in each of the two light transmissive portions 61, but the number of prisms 62 may be 5 or less, or 7 or more. Also, the width of the prism portion 62 in the lateral direction may be changed as appropriate.

In each of the two light-transmitting portions 61, the prism portion 62 is not formed in the left-right direction with respect to the light source 71 because light from the light source 71 is likely to be emitted in the left-right direction.

As shown in FIG. 4, the front end side of the prism portion 62 is rounded. Further, the valley portion between one prism portion 62 and another prism portion 62 adjacent to this prism portion 62, that is, the bottom portion is also chamfered.

The prism portion 62 has a first incident surface 62a and a second incident surface 62b.

The first incident surface 62a faces the light source 71 side and the optical axis X1 side so that the light from the light source 71 directly enters. In other words, the straight line connecting the first incident surface 62a and the light source 71 intersects with the first incident surface 62a so that the light from the light source 71 is directly incident on the first incident surface 62a (the first incident surface 62a). And the light source 71 face each other). Further, in the cover portion 60 on the right side, the first incident surface 62 a is the surface on the left side of the prism portion 62. In the cover portion 60 on the left side, the first incident surface 62 a is the surface on the right side of the prism portion 62. The width of the first incident surface 62a of the right cover portion 60 and the width of the first incident surface 62a of the left cover portion 60 increase in the lateral direction as the distance from the optical axis X1 increases.

The second incident surface 62b does not face the light source 71 side and the optical axis X1 side so that the light from the light source 71 does not directly enter. In other words, the straight line connecting the second incident surface 62b and the light source 71 and the second incident surface 62b do not intersect so that the light from the light source 71 does not directly enter the second incident surface 62b. Further, in the cover portion 60 on the right side, the second incident surface 62b is the right side surface of the prism portion 62, and is the surface opposite to the first incident surface 62a. In the cover portion 60 on the left side, the second incident surface 62b is the left side surface of the prism portion 62, and is the surface opposite to the first incident surface 62a. The width of the second incident surface 62b in the lateral direction becomes smaller as the distance from the optical axis X1 increases.

It should be noted that the light emitted from the light source 71 has a straight line extending from the light source 71 toward the second incident surface 62b and the second incident surface 62b so that it is difficult to directly enter the second incident surface 62b. It is preferable that they match.

The light shielding portion 63 is a resin of a highly reflective material that reflects the light from the light source 71, but may be a light absorbing material or the like that absorbs the light from the light source 71. As the highly reflective material, a material formed of a hard white resin material such as polybutylene terephthalate (PBT) may be used, or a metal vapor deposition film (metal) such as silver or aluminum may be used as a reflective surface on the inner surface of the light shielding portion 63. You may use what formed the reflective film.

The light shielding portion 63 exists on the optical axis X1 of the light source 71 and is arranged symmetrically with respect to the optical axis X1. The light blocking portion 63 blocks the light of the light source 71. In the present embodiment, the light shielding portion 63 is a reflecting portion that reflects the light from the light source 71. The light shielding portion 63 is formed in an arc shape on the inner surface side and the outer surface side in a cross-sectional view. The inner surface side and the outer surface of the light shielding portion 63 are arcs centered on the light source 71 side. The light shielding portion 63 has a smaller diameter as it gets closer to the light source 71, and has a larger diameter as it gets farther from the light source 71. Specifically, the light shielding portion 63 has a fan-like shape in which the distance from the optical axis X1 to the end surface of the light shielding portion 63 in the direction orthogonal to the optical axis X1 increases as the distance from the light source 71 increases in a sectional view. There is.

The light-shielding portion 63 exists on a straight line extending from the light source 71 to the tip of the prism portion 62 of the light-transmitting portion 61 that is closest to the light-shielding portion 63. The prism portion 62 of the light transmitting portion 61 closest to the light shielding portion 63 is the prism portion 62 on the left end side of the light transmitting portion 61 on the right side, and the prism portion 62 on the right end side of the light transmitting portion 61 on the left side. is there.

The entrance surface 61a and the exit surface 61b of the two light transmissive portions 61 may be configured to have light diffusivity by performing diffusion processing. For example, it may be configured to have light diffusivity by forming surface irregularities on the surface of the transparent panel or by printing a dot pattern on the surface of the transparent cover by performing surface treatment such as embossing. .. Further, a film having fine irregularities which has been subjected to surface treatment such as texturing may be attached. In this way, by providing the two light transmitting portions 61 with a light diffusing function, the light incident on the two light transmitting portions 61 is transmitted through the two light transmitting portions 61 while being diffused by the two light transmitting portions 61. ..

During extrusion molding, minute uneven surfaces are formed on the incident surface 61a and the exit surface 61b of the cover portion 60. This uneven surface has the effect of diffusing the light from the light source 71, and prevents uneven brightness and uneven colors in the light distribution. Therefore, it is not an essential condition to perform the process of diffusing light on the two light transmitting portions 61.

In the illuminating device 5 including the cover portion 60 having such a prism portion 62, the prism portion 62 closest to the optical axis X1 side when the light from the light source 71 enters the light transmitting portion 61 on the right side. Will be explained. The same applies to the left transparent portion 61, and a description thereof will be omitted. In FIG. 5, the progress of light is shown by a thick solid line.

When the light from the light source 71 is directly incident on the first incident surface 62a, as shown in FIGS. 4 and 5, when the light is refracted to the right side away from the optical axis X1, and is emitted from the outer surface of the light transmitting portion 61, It further refracts to the right so as to move away from the optical axis X1. Further, since the second incident surface 62b does not face the light source 71 side and the optical axis X1 side so that the light from the light source 71 does not directly enter, it is difficult for the light from the light source 71 to directly enter the second incident surface 62b.

When the light from the light source 71 is directly incident on the vicinity of the tip of the prism portion 62, the light travels substantially straight, is reflected by the right side surface of the light shielding portion 63, and is directed to the right side. Then, the light is emitted from the outer surface of the transparent portion 61 toward the right side so as to be substantially parallel to the left-right direction.

The light distribution and illuminance of the illumination device 5 in the present embodiment will be described with reference to FIGS. 6 and 7.

FIG. 6 is a diagram showing a light distribution curve of the illumination device according to the embodiment. FIG. 7 is a diagram showing an illuminance distribution of the lighting device according to the embodiment. FIG. 7 shows a state in which two lighting devices are arranged in the opening 2c having a vertical length of 1.6 m and a horizontal length of 0.7 m in a state in which the lighting devices are arranged similarly to FIG. Shows the illuminance distribution of the two illumination devices and illuminates the display room of the reach-in showcase with light.

As shown in FIG. 6, the maximum luminous intensity of the lighting device 5 is about 680 cd, and the light distribution angle is about 25°. When the direction of the optical axis X1 is 0°, the angles of the light distribution curve at the maximum luminous intensity are about 75° and about −75°. The light distribution curve at about 75° and about −75° has a longer and narrower luminous intensity than the light distribution curve of FIG. That is, in the lighting device 5, light distribution (bad wing-shaped light distribution) is performed so as to spread in the left-right direction. Further, in this illuminating device 5, as shown by the light distribution curve in FIG. 6, the light shielding portion 63 blocks light at an angle from about 35° to about −35° which is near the optical axis X1. Further, the illumination device 5 is configured not to distribute light to the angle of the light distribution curve larger than about 80° and the angle of the light distribution curve smaller than about −80°. In addition, in this illuminating device 5, in the other illuminating device 5 adjacent to the illuminating device 5, the prism part is arranged so that the light is not distributed in the range of the angle from about 35° to about −35° which is near the optical axis X1. 62 controls the light distribution.

In the diagram showing the illuminance distribution shown in FIG. 7, even when compared with the diagram showing the illuminance distribution in FIG. 9, there are no large spots on the whole, and the difference in height of the illuminance is small. Therefore, the illuminating device 5 has higher uniformity than the illuminating device 5 using the reflector.

The cover portion 60 in the present embodiment has a size capable of covering a width of 17.5 mm in the left-right direction. The cover part 60 is a part of a circle formed with a radius of 18 mm. The distance between the substrate 72 and the apex on the outer peripheral surface of the cover portion 60 is 8.7 mm. The width in the left-right direction on the inner peripheral side of the light-shielding portion 63 is 3 mm, and the width in the left-right direction on the outer peripheral side of the light-shielding portion 63 is 6 mm.

[Comparative example 2]
The illumination device 5 in Comparative Example 2 in which the light shielding portion 63 is not provided will be described with reference to FIGS. 10 and 11.

FIG. 10 is a cross-sectional view of the cover portion 160 in the lighting device according to the second comparative example. 11: is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 2. FIG.

In the illumination device 5 of Comparative Example 2, the light shielding portion 63 provided in the present embodiment is not provided, and the prism portion 62 is also provided in the portion where the light shielding portion 63 of the present embodiment is provided. There is. In the illuminating device 5 according to the comparative example 2, since the light shielding portion 63 is not provided on the optical axis X1, as shown in FIG. 11, at an angle of about 70° to about −70° on the optical axis X1 direction side. It can be seen from the light distribution curve that light is being emitted. On the optical axis X1 direction side, a support portion that supports the display shelf 2b from below may be arranged, and therefore, products are not normally displayed in such a place. Therefore, it is desired to reduce the irradiation of light in the direction of the optical axis X1 and to irradiate the light in the direction away from the optical axis X1 (left-right direction). In the present embodiment, there is a problem of reducing irradiation in the optical axis X1 direction in order to perform light distribution control without using a reflector and to prevent the structure from becoming complicated.

In this illumination device 5, the maximum luminous intensity is about 510 cd and the light distribution angle is about 15°. When the direction of the optical axis X1 is 0°, the angles of the light distribution curve at the maximum luminous intensity are about 83° and about −83°. The light distribution curves at about 83° and about −83° have elongated light intensity. Further, it can be seen from the light distribution curve that light is emitted at an angle from about 70° to about −70° on the optical axis X1 direction side in the light distribution curve. The luminous intensity at an angle of about 70° to about −70° on the optical axis X1 direction side fluctuates between about 100 cd and about 200 cd.

It can be seen that light distribution unevenness occurs at an angle from about 35° to about −35°, which is near the optical axis X1. Such unevenness of light distribution is mainly due to the fact that the illuminance distribution becomes high even if the illuminance of the light source 71 is small because the distance between the inner surface of the cover part 60 and the light source 71 is short. In the illumination device 5 according to the present embodiment, the light shielding portion 63 is arranged so as to block light having an angle of about 35° to about −35° near the optical axis X1. Comparing FIG. 6 and FIG. 12, the illumination device 5 of the comparative example 2 has such uneven light distribution as compared to the illumination device 5 of the present embodiment. That is, in the illumination device 5 of Comparative Example 2, it is not possible to block light at an angle of about 35° to about −35° which is near the optical axis X1. For this reason, in the reach-in showcase 1 using the illumination device 5 of Comparative Example 3, the light distribution is uneven in the display room 2a of the reach-in showcase 1, and the appearance is poor.

[Comparative Example 3]
Next, Comparative Example 3 using a transparent material instead of the light shielding portion 63 will be described with reference to FIGS. 12 to 14.

12: is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 3. FIG. 13: is a figure which shows the light distribution curve of the illuminating device which concerns on the comparative example 3. FIG. FIG. 14 is a diagram showing an illuminance distribution of the illumination device according to Comparative Example 3. FIG. 14 shows a state in which two lighting devices are arranged in the opening 2c having a vertical length of 1.6 m and a horizontal length of 0.7 m in a state where the lighting devices are arranged similarly to FIG. Shows the illuminance distribution of the two illumination devices and illuminates the display room of the reach-in showcase with light.

In FIG. 12, the maximum luminous intensity of the lighting device 5 is about 1000 cd, and the light distribution angle is about 10°. When the direction of the optical axis X1 is 0°, the angles of the light distribution curve at the maximum luminous intensity are about 80° and about −80°. The light distribution curves at about 80° and about −80° have elongated light intensity. Further, it can be seen from the light distribution curve that light is emitted at an angle from about 40° to about −40° on the optical axis X1 direction side in the light distribution curve. The luminosity at an angle of about 40° to about −40° on the optical axis X1 direction side fluctuates between about 100 cd and about 200 cd.

FIG. 13 shows the case where a member obtained by adding a diffusing material having a light diffusing property to a transparent material is used. The maximum luminous intensity of this lighting device 5 is about 190 cd, and the light distribution angle is about 10°. When the direction of the optical axis X1 is 0°, the angles of the light distribution curve at the maximum luminous intensity are about 80° and about −80°. It can be seen from the light distribution curve that light is emitted in the direction of the optical axis X1 in the light distribution curve (angle from about 65° to about −65°). The light distribution curve from about 65° to about −65° is rounded and wavy in the direction of the optical axis X1. The luminous intensity at an angle of about 65° to about −65° fluctuates between about 130 cd and about 160 cd. It has been found that in the member in which the diffusing material is added to the transparent material, light is diffused by the diffusing material in a wider range than in the case where the transparent material in FIG. 12 is used.

Comparing FIG. 6 with FIGS. 12 and 13, the lighting device 5 of FIGS. 12 and 13 of Comparative Example 3 has uneven light distribution than the lighting device 5 of the present embodiment. That is, in the illumination device 5 of Comparative Example 3 in FIG. 12, the light cannot be blocked at an angle from about 40° to about −40° which is near the optical axis X1. In addition, in the illumination device 5 of Comparative Example 3 in FIG. 13, light cannot be blocked at an angle from about 65° to about −65°, which is near the optical axis X1. For this reason, even in the reach-in showcase 1 using the lighting device 5 of Comparative Example 3, uneven distribution of light occurs in the display room 2a of the reach-in showcase 1, and the appearance is poor.

FIG. 14 shows an illuminating device 5 in which a member obtained by adding a diffusion material to the transparent material in FIG. 13 is used. In the diagram showing the illuminance distribution shown in FIG. 14, even as compared with the diagram showing the illuminance distribution in FIG. 7, large spots are present as a whole, and the difference in height of the illuminance is large. Therefore, the illuminating device 5 of Comparative Example 3 has a lower degree of uniformity than the illuminating device 5 of the present embodiment.

[Effect]
Next, the function and effect of the lighting device 5 in the present embodiment will be described.

As described above, the illumination device 5 according to the present embodiment is arranged so as to cover the light source 71 that emits light and the light source 71, transmits the incident light, and emits the light to the outside. And a cover section 60. Further, the cover part 60 extends in the vertical direction of the cover part 60 and is sandwiched between the two light transmitting parts 61 that transmit the light of the light source 71 and the two light transmitting parts 61, and on the optical axis X1 of the light source 71. And a light-shielding portion 63 that shields the light of the light source 71. Further, each of the two light transmitting portions 61 is formed with a plurality of prism portions 62 each extending in the vertical direction. Then, each of the plurality of prism portions 62 refracts the light of the light source 71 in the direction away from the optical axis X1.

According to this configuration, the light from the light source 71 passes through the prism portion 62 of the light transmitting portion 61 and is refracted in the direction away from the optical axis X1. Further, since the light-shielding portion 63 exists on the optical axis X1, it is more difficult for the light to be irradiated to the rear direction than the light-shielding portion 63, and therefore the light-shielding portion 63 is arranged more than the cover portion 160 without the light-shielding portion 63 as shown in FIG. Light spots are unlikely to occur. Therefore, the light that has entered the light-transmitting portion 61 on the right side is refracted in a substantially right direction that is a direction away from the optical axis X1, and the light that has entered the light-transmitting portion 61 on the left side is a substantially left direction that is away from the optical axis X1. Refract in the direction. As a result, the two light transmitting portions 61 distribute the light so as to spread in the substantially left-right direction and block the light in the rearward direction. Therefore, light distribution control can be performed without using a member such as a reflector.

Therefore, while controlling the light distribution in a desired direction, the manufacturing cost can be reduced by increasing the number of parts.

In addition, the reach-in showcase 1 according to the present embodiment includes a lighting device 5 and a display shelf 2b that is arranged in the display room 2a that stores products and that displays the products. The lighting device 5 is arranged so as to emit light in the display room 2a so as to be substantially orthogonal to the display shelf 2b.

Even in this configuration, the reach-in showcase 1 including the lighting device 5 has the same effect.

Further, in the illumination device 5 according to the present embodiment, each of the plurality of prism parts 62 projects toward the light source 71 from the inner surface of the light transmitting part 61 on the light source 71 side.

According to this configuration, the light from the light source 71 is distributed in a direction away from the optical axis X1 (a substantially horizontal direction intersecting the optical axis X1). Therefore, it becomes easier to perform the light distribution control in the substantially left-right direction intersecting the optical axis X1.

Further, in the illumination device 5 according to the present embodiment, each of the plurality of prism portions 62 has a substantially triangular shape when the cover portion 60 is cut in a cross section taken along a plane substantially orthogonal to the vertical direction, They are lined up so as to be away from the optical axis X1. Further, in a cross-sectional view of the cover portion 60 when cut along a plane substantially orthogonal to the vertical direction, the prism portion 62 farther from the optical axis X1 than the prism portion 62 closer to the optical axis X1 is the prism portion 62. The apex angle θ is large, and the height from the inner surface to the tip of the prism portion 62 is small.

According to this configuration, the light from the light source 71 is refracted by the prism portion 62 and is radiated substantially in the left-right direction. Therefore, the light is transmitted to the right by the light transmitting portion 61 on the right side, and is distributed to the left by the light transmitting portion 61 on the left side. Therefore, it is easier to control the light distribution.

Further, in the illumination device 5 according to the present embodiment, each of the plurality of prism portions 62 has the first incident surface 62a facing the light source 71 side and the optical axis X1 side so that the light of the light source 71 directly enters. Have

According to this configuration, when the light of the light source 71 is directly incident on the first incident surface 62a, it is refracted in a direction away from the optical axis X1. For this reason, since the light is distributed so as to spread in the left-right direction by the two light transmitting portions 61, it becomes easier to perform the light distribution control.

In addition, in the illumination device 5 according to the present embodiment, each of the plurality of prism portions 62 has a second incident surface 62b that does not face the light source 71 side and the optical axis X1 side so that the light from the light source 71 does not directly enter. have.

According to this configuration, it is difficult for the light of the light source 71 to directly enter the first incident surface 62a, and thus it is difficult for the light to be emitted to the optical axis X1 side.

In addition, in the illumination device 5 according to the present embodiment, the light shielding portion 63 is covered so that the distance from the optical axis X1 in the direction orthogonal to the optical axis X1 to the end surface of the light shielding portion 63 increases as the distance from the light source 71 increases. It is provided in the section 60.

According to this configuration, the light incident on the right side surface of the light shielding portion 63 is reflected and emitted rightward, and the light incident on the left side surface of the light shielding portion 63 is reflected and emitted leftward. Therefore, the light in the vicinity of the optical axis X1 is distributed so as to spread in the left-right direction, and thus it is difficult for the light to be emitted rearward from the light shielding portion 63.

Further, in the illumination device 5 according to the present embodiment, the light shielding portion 63 is present on a straight line extending between the light source 71 and the tip of the prism portion 62 that is close to the light shielding portion 63.

With this configuration, the light incident from the tip of the prism portion 62 closest to the light shielding portion 63 is reflected by the side surface of the light shielding portion 63. Therefore, the light in the vicinity of the optical axis X1 is distributed so as to spread in the left-right direction, so that the light emitted in the rear direction is further reduced.

In addition, in the illumination device 5 according to the present embodiment, the light shielding portion 63 is a reflecting portion that reflects the light of the light source 71.

According to this configuration, the amount of light emitted in the left-right direction is increased as compared with the case where the light transmitting portion 61 is a light absorbing member.

Further, in the illumination device 5 according to the present embodiment, the light transmitting portion 61 and the light shielding portion 63 are integrally formed by multicolor molding.

According to this structure, it is possible to easily form a member having the light-transmitting portion 61 and the light-shielding portion 63 having different characteristics.

(Other modifications)
Although the lighting device and the reach-in showcase according to the present invention have been described above based on the present embodiment, the present invention is not limited to the above-mentioned embodiment.

In addition, in the above-mentioned embodiment, a plurality of pairs of slide supporting portions may be provided so that the position of the mounting plate can be changed. In this case, the position can be adjusted by sliding the mounting plate to one of the pair of slide supporting parts and mounting it. Therefore, the position of the light emitting portion or the like can be adjusted with respect to the prism portion.

In addition, it is realized by making various modifications to the present embodiment that can be thought of by those skilled in the art, and by arbitrarily combining the components and functions of the present embodiment without departing from the spirit of the present invention. The form is also included in the present invention.

1 Reach-in showcase 2a Display room 2b Display shelf 5 Lighting device 60 Cover part 61 Light transmitting part 61a Incident surface (inner surface of light transmitting part)
62 prism part 62a 1st entrance surface 62b 2nd entrance surface 63 light-shielding part (reflection part)
71 Light source X1 Optical axis θ Vertical angle

Claims (10)

A light source that emits light,
A long cover portion that is arranged so as to cover the light source, transmits incident light, and emits the light to the outside.
The cover is
Two light transmitting portions extending in the longitudinal direction of the cover portion and transmitting the light of the light source;
A light-shielding portion that is sandwiched between the two light-transmitting portions, is present on the optical axis of the light source, extends in the longitudinal direction, and shields the light of the light source;
A plurality of prism portions each extending in the longitudinal direction are formed in each of the two light transmitting portions,
Each of the plurality of prism portions refracts the light of the light source in a direction away from the optical axis ,
Each of the plurality of prism portions, from the inner surface of the light transmitting portion on the light source side, protrudes toward the light source,
In the case of cross-sectional view of the cover portion when cut in a plane substantially orthogonal to the longitudinal direction,
Each of the plurality of prism portions has a substantially triangular shape and is arranged so as to be separated from the optical axis.
An illuminating device in which the prism portion farther from the optical axis has a larger apex angle of the prism portion and the height from the inner surface to the tip of the prism portion is smaller than that of the prism portion closer to the optical axis . A light source that emits light,
A long cover portion that is arranged so as to cover the light source, transmits incident light, and emits the light to the outside.
The cover is
Two light transmitting portions extending in the longitudinal direction of the cover portion and transmitting the light of the light source;
A light-shielding portion that is sandwiched between the two light-transmitting portions, is present on the optical axis of the light source, extends in the longitudinal direction, and shields the light of the light source;
A plurality of prism portions each extending in the longitudinal direction are formed in each of the two light transmitting portions,
Each of the plurality of prism portions refracts the light of the light source in a direction away from the optical axis,
Each of the plurality of prism portions has a second incident surface that does not face the light source side and the optical axis side so that the light of the light source does not directly enter.
Lighting equipment. A light source that emits light,
A long cover portion that is arranged so as to cover the light source, transmits incident light, and emits the light to the outside.
The cover is
Two light transmitting portions extending in the longitudinal direction of the cover portion and transmitting the light of the light source;
A light-shielding portion that is sandwiched between the two light-transmitting portions, is present on the optical axis of the light source, extends in the longitudinal direction, and shields the light of the light source;
A plurality of prism portions each extending in the longitudinal direction are formed in each of the two light transmitting portions,
Each of the plurality of prism portions refracts the light of the light source in a direction away from the optical axis,
The light-shielding portion is provided on the cover portion such that a distance from the optical axis in a direction orthogonal to the optical axis to an end surface of the light-shielding portion increases as the distance from the light source increases,
The light-shielding portion is present on an extension line of a straight line connecting the light source and the tip of the prism portion that is close to the light-shielding portion.
Lighting equipment. The illumination device according to claim 2 , wherein each of the plurality of prism portions protrudes from the inner surface of the light transmitting portion on the light source side toward the light source. Each of said plurality of prism portions is any one of claims 1 to 4 has a first incident surface where the light of the light source is facing the light source side and the optical axis side to be incident directly The lighting device according to. The illumination device according to claim 1 or 3 , wherein each of the plurality of prism portions has a second incident surface that does not face the light source side and the optical axis side so that light from the light source does not directly enter. .. The light shielding unit, with distance from the light source, from the optical axis in a direction perpendicular to the optical axis the light shielding portion according to claim 1-6 where the distance to the end face is provided on the cover portion so as to increase the The lighting device according to claim 1. The lighting device according to any one of claims 1 to 7, wherein the light shielding portion is a reflecting portion that reflects the light of the light source. The illumination device according to claim 1, wherein the light transmitting portion and the light shielding portion are integrally formed by multicolor molding. A lighting device according to any one of claims 1 to 9,
Arranged in a display room for storing products, and including a display shelf for displaying the products,
The lighting device is arranged so as to irradiate light in the display room so as to be substantially orthogonal to the display shelves.

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