JP2016096048A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire an illumination environment with an open feeling and to acquire a brightness feeling of a space with small power consumption, in a lighting system.SOLUTION: A lighting system 1 includes: a plurality of panels 2 for configuring a ceiling surface C; and a plurality of lighting fixtures 3 one of which is provided at each panel 2. The lighting fixture 3 has: an LED 5; and an optical member 6 provided so as to come into contact with the panel 2 and for controlling light distribution of the light emitted from the LED 5. The optical member 6 has: a task light distribution part (transparent surface 61) for distributing the light emitted from the LED 5 toward a space desk top 7 opposing to the panel 2; and an ambient light distribution part (total reflection surface 62, lateral emission surface 63) for distributing the light emitted from the LED 5 in the direction along the panel 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an ambient lighting system used for task ambient lighting.

  Conventionally, the general lighting plan in the office has been either ambient lighting that uniformly illuminates the entire room by arranging lighting fixtures such as base lights embedded in the ceiling, or in addition to ambient lighting, the desk top surface has high illuminance. It is composed of lighting fixtures such as a desk stand that irradiates with and secures the illuminance necessary for work.

  Such task ambient lighting increases the energy consumption of ambient lighting. Therefore, desk surface illumination that affects visual work in offices, etc. is sufficiently secured by task lighting, and it is necessary to secure the necessary illuminance and brightness as a space in the indoor space area (ambient lighting). While maintaining the lighting environment, the overall power consumption required for lighting can be reduced.

  However, in the task ambient lighting as described above, for example, when lighting equipment such as a desk stand stands on each desk in the office, the scenery in the office is damaged, or the lighting equipment becomes an obstacle and the work environment May become complicated. Therefore, ambient lighting is lined up in the ceiling above the lighting area, and the louver unit and the light transmissive material unit are mounted in parallel on a hanging fixture fixed between the ambient lighting lines, and task lighting is mounted between them. A mounted illumination system is known (for example, see Patent Document 1).

  In addition, an ambient illumination device having a 1/2 beam angle of 40 ° or more and a tubular fluorescent lamp as a light source, and a task illumination device having a 1/2 beam angle of 20 ° or less using a light bulb and a bowl-shaped reflector Are known (see, for example, Patent Document 2).

JP 2000-100203 A JP 2001-93393 A

  However, when the task lighting is suspended from the ceiling as in the lighting system described in Patent Document 1, even if it is an office space with a high ceiling, there is a possibility that the feeling of release may be impaired. Further, in the lighting apparatus described in Patent Document 2, unless the ambient lighting device is turned on with high output, it is not possible to obtain a sufficient sense of brightness in the space, which may increase power consumption required for illumination. . Furthermore, it is difficult to irradiate the ceiling surface uniformly.

  This invention solves the said subject, and provides the illumination system which can obtain the illumination environment with a feeling of freedom, and can obtain the brightness of space effectively with little power consumption. Objective.

  In order to solve the above-described problems, an illumination system according to the present invention is an illumination system including a plurality of panels constituting a ceiling surface, and a plurality of lighting fixtures provided for each of the plurality of panels. The lighting fixture includes an LED and an optical member that is provided in contact with the panel and controls light distribution of light emitted from the LED, and the optical member is emitted from the LED. A task light distribution unit that distributes light toward the upper surface of the space desk facing the panel, and an ambient light distribution unit that distributes light emitted from the LEDs in a direction along the panel. And

  According to the illumination system of the present invention, the ambient light distribution unit can efficiently increase the feeling of brightness for the office worker by irradiating light along the panel constituting the ceiling surface. In addition, the task light distribution unit illuminates the upper surface of the desk with good uniformity, so that it is possible to realize an illumination environment that allows office work even at low illuminance. Accordingly, it is possible to effectively obtain a sense of brightness of the space with less power consumption. In addition, since an optical member is attached to the panel constituting the ceiling surface, and light is emitted from this optical member, for example, task lighting suspended from the ceiling is not required, and a lighting environment with a sense of freedom is obtained. Can do.

The perspective view of the indoor space using the illumination system which concerns on one Embodiment of this invention. (A) is a side view which shows the panel and lighting fixture used for the illumination system, (b) is a front view. The sectional side view of the said lighting fixture. The figure which shows the light distribution curve of the said lighting fixture. The side view of the indoor space which constructed the said illumination system. The figure which shows the annual power consumption in the said lighting system, a feeling of brightness, and a glare.

  An illumination system according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the illumination system 1 of this embodiment is constructed indoors, such as a conference room or an office, and is suitably used for an indoor space having a large floor area. The lighting system 1 includes a plurality of panels 2 constituting the ceiling surface C, and a plurality of lighting fixtures 3 provided for each of the plurality of panels 2. One lighting fixture 3 is provided for one panel 2, and these constitute a lighting module 10. The panel 2 is a square rectangular plate material, for example, and is applied in a matrix form through a frame provided at a predetermined distance from the ceiling of the building.

  As shown in FIGS. 2A and 2B, in the lighting module 10, the lighting fixture 3 is provided at a position separated from the center of the panel 2. Therefore, the panel 2 can set wide the area | region where the lighting fixture 3 is not provided, and can provide various apparatuses, such as the illustrated sprinkler 4 and the announcement speaker (not shown).

  As illustrated in FIG. 3, the lighting fixture 3 includes an LED 5 and an optical member 6 that controls light distribution of light emitted from the LED 5. In addition, the lighting fixture 3 includes a base unit 51 on which the LED 5 is mounted, and a drive circuit 52 that supplies predetermined power to the LED 5. The panel 2 is provided with a through hole 21, and a housing that accommodates the drive circuit 52 is fitted into the through hole 21, and the LED 5 is provided so as to protrude to the indoor side surface (lower surface in the figure) of the panel 2. . The optical member 6 is provided on the indoor side surface of the panel 2.

  For example, the LED 5 is preferably an LED module in which a YAG-based yellow phosphor is coated on a GaN-based blue LED chip that emits blue light having an emission peak wavelength of 460 nm, and white light is emitted by mixed light of blue light and yellow light. Used for.

  The optical member 6 is formed from a light-transmitting material such as acrylic resin, silicone resin, or glass, and is provided in contact with the panel 2. The optical member 6 includes a task light distribution unit that distributes the light emitted from the LED 5 toward the space desk upper surface 7 (see also FIGS. 1 and 5) facing the panel 2, and the light emitted from the LED 5. An ambient light distribution unit that distributes light in a direction along the panel 2. In addition, the arrow in a figure shows the example of the optical path of the emitted light.

  The surface of the optical member 6 opposite to the LED 5 is formed in a mortar shape, and the central portion including the optical axis direction of the LED 5 is thin and thick toward the side portion. The task light distribution unit is a surface facing the LED 5, and has a flat transmission surface 61 that transmits light emitted at a relatively narrow angle around the optical axis Ax direction of the LED 5. In addition, the surface of the transmission surface 61 may be subjected to a light diffusion process in order to suppress glare for the worker looking up at the ceiling.

  The ambient light distribution portion is formed so as to be inclined from the transmission surface 61 to the side, and totally reflects the light emitted from the LED 5 at a relatively wide angle, and stands from the total reflection surface 62 to the panel 2 side. And a side emission surface 63 for emitting the light totally reflected by the total reflection surface 62 to the outside. The side emission surface 63 is slightly inclined outward and refracts the emitted light toward the panel 2.

  The ratio of the luminous flux of the light emitted from each of the task light distribution unit (transmission surface 61) and the ambient light distribution unit (total reflection surface 62 and side emission surface 63) is 75 to 85%: 25 to 15%. It is preferable. In the illumination system 1 of the present embodiment, the ambient illumination mainly illuminates the panel 2 adjacent to the luminaire 3, so that the luminous flux may be smaller than that of the task illumination. Thereby, efficient ambient illumination can be performed.

  Further, when the light distribution angle is 0 ° in the direction orthogonal to the panel 2, as shown in FIG. 4, the light distribution angle of the light emitted from the task light distribution unit is 65 ° or less, and the ambient light distribution unit Each light distribution of the emitted light is desirably 85 ° or more. If it carries out like this, while performing task illumination toward the space desk upper surface 7 effectively, ambient illumination can be efficiently performed toward the panel 2.

  Moreover, it is preferable that the radiation intensity of the light in the 65-90 degree light distribution angle is at least 200 cd or less. When an illuminator using an LED as a light source is installed in an indoor space having a large floor area, there is a possibility of generating glare for a worker who is far away from the luminaire. Therefore, in the lighting system 1 of the present embodiment, glare for a worker who is far away from the lighting fixture 3 is reduced by suppressing the radiation intensity of light emitted obliquely downward of the certain lighting fixture 3. Preferably 20 cd or less. The light emission intensity at a light distribution angle of 65 to 85 ° is more preferably 6 cd or less.

  Further, in the lighting system 1, for example, as shown in FIG. 5, the area E of the space desk upper surface 7 directly below the center lighting fixture 3a in the drawing has an area substantially equal to the panel 2 and the lighting fixture 3a and the lighting fixture 3a. Light from the task light distribution unit of the surrounding lighting device (lighting devices 3b and 3c in the illustrated side view) is irradiated. Thus, the task illumination in the lighting system 1 does not illuminate a specific area with a single luminaire such as a conventional desk stand, but illuminates the space desk top surface 7 with a plurality of luminaires 3 in a superimposed manner. . Therefore, the space desk upper surface 7 can be illuminated with good uniformity. Moreover, since the area E of the set illuminance and the area of the panel 2 are substantially equal, the area where task illumination is performed can be associated with the area where the illumination module 10 is constructed, and a desired illumination environment can be easily obtained. it can.

  FIG. 6 shows the annual power consumption, the feeling of brightness, and the glare in the examples of the lighting system 1 of the present embodiment and the comparative examples 1 to 3. Comparative Example 1 shows an illumination environment in which a fluorescent lamp is used as a light source and the set illuminance at 640 square is 600 Lx, and the annual power consumption in Comparative Example 1 is 1200 MWh. Comparative Example 2 shows an illumination environment when the light source is replaced from a fluorescent lamp to an LED. In addition, in order to illuminate the same area as the fluorescent lamp, an optical member that makes light distribution in a wide angle is used for the LED. In Comparative Example 2, an LED having a light emission efficiency higher than that of a fluorescent lamp was used as the light source, so that the power consumption could be reduced by 25% while realizing the same illuminance as in Comparative Example 1. However, since a wide light distribution optical member is used for the LED, glare is likely to occur. On the other hand, the comparative example 3 shows the illumination environment which lowered the lighting output of LED and set illumination intensity to 300Lx. 300 Lx is the minimum illuminance necessary for a worker to perform visual work. In Comparative Example 3, although the glare can be reduced, the lighting output is lowered, so that the feeling of brightness (Feu) is lowered.

  On the other hand, in the example to which the illumination system 1 of the present embodiment is applied, the glare is more effectively suppressed than the comparative example 3 while ensuring the minimum necessary illuminance of 300 Lx, and the brightness is higher than that of the comparative example 2. I was able to get the feeling. In addition, the power consumption can be reduced by 25% compared to Comparative Example 1.

  The light is perceived by the worker's vision by irradiating the object, and the light that is simply emitted into the space hardly contributes to the improvement of the sense of brightness for the worker. For this reason, when irradiating light in general, such as conventional fluorescent lamps and LEDs using a wide light distribution optical member, it is necessary to increase the lighting output in order to obtain a sufficient brightness. It was.

  On the other hand, in the illumination system 1 of the present embodiment, the ambient light distribution unit irradiates light along the panel 2 that constitutes the ceiling surface, so that a sense of brightness for the office worker can be efficiently increased. . In addition, since the task desk light distribution unit of the plurality of lighting fixtures 3 illuminates the space desk top surface 7 with good uniformity, it is possible to realize an illumination environment that allows office work even at low illuminance. Accordingly, it is possible to obtain a feeling of brightness of the space with less power consumption.

  Moreover, according to the illumination system 1 of this embodiment, the optical member 6 is attached to the panel which comprises a ceiling surface, and light is emitted from this optical member 6, For example, the task illumination suspended from the ceiling is used. In particular, it is possible to obtain an open lighting environment in a conference room or office space with a high ceiling.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. In the said embodiment, although the permeation | transmission part 61 which comprises a task light distribution part showed the flat structure, the convex or concave curved surface may be sufficient as this permeation | transmission part 61 has a condensing property. For example, if the light distribution angle of the transmission part 61 is too wide when the ceiling of the site where the lighting system 1 is installed is high, the function cannot be performed sufficiently as task lighting, and a lot of light is wasted in the space. . On the other hand, when the ceiling of the construction site where the lighting system 1 is installed is high, if the light distribution angle of the transmission part 61 is too narrow, light may be emitted as a part of the space desk upper surface 7 and the appearance may deteriorate. . Therefore, the illumination environment required more efficiently can be obtained by using optical members having different light distribution angles of the task light distribution units according to the ceiling height of the site where the lighting system 1 is constructed. .

DESCRIPTION OF SYMBOLS 1 Lighting system 2 Panel 3 Lighting fixture 5 LED
6 Optical members 61 Transmission surface (task light distribution part)
62 Total reflection surface (Ambient light distribution part)
63 Side transmission surface (ambient light distribution part)

Claims (5)

A lighting system comprising a plurality of panels constituting a ceiling surface, and a plurality of lighting fixtures provided for each of the plurality of panels,
The lighting fixture includes an LED and an optical member that is provided in contact with the panel and controls light distribution of light emitted from the LED.
The optical member distributes the light emitted from the LED toward the upper surface of the space desk facing the panel, and distributes the light emitted from the LED in a direction along the panel. And an ambient light distribution unit.   2. The illumination system according to claim 1, wherein a ratio of light fluxes of light emitted from each of the task light distribution unit and the ambient light distribution unit is 75 to 85%: 25 to 15%.   When the light distribution angle is 0 ° in the direction orthogonal to the panel, the light distribution angle of the light emitted from the task light distribution unit is 65 ° or less, and the light distribution of the light emitted from the ambient light distribution unit The illumination system according to claim 1 or 2, wherein the angle is 85 ° or more.   The illumination system according to claim 3, wherein the radiation intensity of light at a light distribution angle of 65 to 90 ° is 200 cd or less.   The lighting system according to any one of claims 1 to 4, wherein the lighting fixture is provided at a position separated from a center of the panel.