JPH08279306A - Indoor luminaire - Google Patents

Abstract

PURPOSE: To provide an indoor luminaire, which can improve the brightness of the whole of a room and which generates the active atmosphere, by providing at least one bright area, which satisfies the predetermined condition, so that it can be seen over a light emitting part from any position of the predetermined area, which is determined on the basis of an indoor light emitting part as a reference. CONSTITUTION: The light, which is emitted downward at a right angle from a light source 1, directly lights the working surface, and the light, which is emitted toward the mirror surface reflecting part 3, is reflected, and finally lights the working surface. These light for lighting the working surface is limited in the only direction at 0-60 degree of vertical angle, and a part of other part of the light is reflected by a scattering reflecting part 4. In this case, the surface of the scattering and reflecting part 4 is finished to the perfect scattering surface, and it is seen equal and uniform luminance from any direction, the whole thereof is considered as a bright area. The scattering and reflecting part 4 is formed so that it satisfies the condition such as a predetermined formula 3.3<=log L (luminance) <=-0.3logω (solid angle) +2.63, and that it can be seen over the light emitting part from any position of the predetermined area, which is determined on the basis of the light emitting part as a reference, and the brightness of the whole of a room is improved, and the active atmosphere can be generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminaire for use indoors such as in an office, which has a shine without giving glare and makes a room feel bright.

[0002]

2. Description of the Related Art FIG. 17 is a schematic diagram showing three types of conventional indoor lighting equipment, and FIG. 18 is a diagram showing the relationship between the vertical angle and the brightness of the conventional indoor lighting equipment.

FIG. 17 (a) is generally called an exposure type luminaire, and has a structure in which light is distributed almost evenly to a work surface, a wall surface and a ceiling surface, and a lamp is directly viewed.

Vertical angle 4 with 0 degrees right below the lighting equipment
The luminance in the range of 5 degrees to 85 degrees (the direction directly viewed in the normal sitting posture) is about 8000 [cd / as shown in FIG. 8 (a).
m ² ]. The downward projected area of the lighting unit of the lighting fixture is about 0.0
It is 35 [m ² ].

FIG. 17 (c) is generally called a glare control type luminaire, and has a structure in which a wedge-shaped lattice louver is attached to the lower surface of the luminaire in order to prevent reflection glare on the CRT surface of Oa equipment or the like. Has become.

As a result, as shown in FIG. 18, the light distribution of the luminaire having a vertical angle of 60 degrees or more is strictly limited, and the luminance of the vertical angle of 60 degrees to 85 degrees is 50 [cd / m ² ] or less. Has become. The downward projected area of the light emitting part is about 0.35.
[M ² ].

FIG. 17 (b) is an intermediate figure between (a) and (c), which is generally called an open-bottom type luminaire. When the lamp is installed close to an office worker, the lamp is The structure is such that the lamp is not directly viewed when it is directly viewed and installed at a horizontal distance of about 15 m or more.

The brightness of a vertical angle of 60 to 85 degrees of this luminaire is about 1500 to 6000 [cd as shown in FIG.
/ M ² ], and the downward projection area of the light emitting unit is about 0.35 [m
² ].

Although these luminaires are used in general offices, in addition to these, there are luminaires for down-light bulbs and small fluorescent lamps mainly used in stores. .

The downward projected area of the light emitting portion of these luminaires is 0.0122 to 0.0177 [m ² ] (diameter is about 0.125 to 0.15 m).

In addition to the above-mentioned typical lighting fixtures used for indoor lighting fixtures, there is a lighting fixture generally called a chandelier.

This has no purpose in "illuminating things",
It is a lighting fixture that aims to create a luxurious atmosphere by combining a small, high-intensity incandescent light bulb with glass beads, etc. to create a luxurious atmosphere.

Since this light emitting part is a light bulb and glass beads, the downward projected area of each light emitting part is 0.001.
It is less than or equal to [m ² ].

Therefore, the apparent size from a position several meters away is about 4 × 10 ^-5 [sr] and the brightness is 20,000 [cd / m ² ] or more.

[0015]

However, as shown in FIG.
As shown in FIG. 18, the exposed luminaire of (a) has a high luminance of about 8000 [cd / m ² ] at a vertical angle of 60 degrees to 85 degrees which is directly viewed in a normal sitting posture, and therefore, in this range. There is a problem that glare is felt when viewed from a vertical angle. The glare control type luminaire shown in FIG. 17 (c) has a light emitting portion (vertical angle of 60 degrees or more) which is visible in a normal sitting posture in order to prevent glare with respect to human eyes and reflected glare on the CRT surface.
Since the brightness in the 85 degree direction is suppressed to 50 [cd / m ² ] or less, it may not be clear whether the lighting equipment is on or off. I do not know if the light is coming on and I feel uncomfortable, and because there is no high brightness part on the ceiling surface,
There was a problem that the whole room had a strong sense of depression and a dismal viewing environment.

The bottom open type luminaire shown in FIG. 17 (b) is a light emitting part (vertical angle 60 ° to 60 °) of the luminaire which can be seen in a normal sitting posture.
The brightness at 85 degrees) is about 1500 to 6000 [cd / m ² ], and the lamp is directly viewed in the vicinity, causing large glare.

On the contrary, since the lamp is shielded at a distant place, the glare disappears, but like the glare control type luminaire shown in FIG. 17 (c), since there is no light emitting part with high brightness on the ceiling surface, the indoor environment is a negative visual environment. There was a problem of becoming.

On the other hand, an incandescent light bulb or a small fluorescent lamp is used as the downlight, and the brightness is about 2000 to 6000 [cd / cd in the range of vertical angle of 60 to 90 degrees.
m ² ], and the downlight at a position far from the observer has no glare, but the downlight at a close position has a problem that glare is felt.

Further, the chandelier gives a glittering and luxurious feeling like a diamond and does not have a gloomy atmosphere at all, but the illuminance for visual work cannot be obtained because the absolute light amount is small.

Further, since the size of the entire chandelier is relatively large and it is used by suspending it from the ceiling, there are problems such as giving a feeling of pressure and obstructing the field of view in an office with a ceiling as low as about 2.5 m. It was

In view of the above conventional problems, the present invention provides a desired illuminance to the work surface without giving direct glare to the office worker, making the ceiling surface not feel dark, and not obstructing the field of view much. It is an object of the present invention to provide an indoor lighting device that makes the whole body feel bright and gives a lively atmosphere.

[0022]

In order to achieve the above object and to make the entire room feel bright, the present invention is configured to realize an appropriate relationship between the brightness area of the light emitting portion and the brightness.

That is, according to the present invention, the brightness of the shining area in the living room in the living room is L [unit: cd / m ² ], and the apparent size of the shining area is the solid angle ω [unit: sr (steradian). )], The relationship between the luminance L and the solid angle ω is 3.3 ≦ logL ≦ −0.3logω + 2.63 or logL ≦ −0.3logω + 2.63 3.64 ≦ logL ≦ 3. The indoor lighting device is characterized in that at least one shining region satisfying the condition of 90 is visible on the light emitting unit at any position in a predetermined area in the living room determined based on the light emitting unit in the living room. .

As described above, by setting the brightness L and the apparent size (solid angle ω) of the light emitting portion, the lighting equipment makes the office worker feel bright without giving an unpleasant glare to the office worker.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

It is generally empirically known that the higher the brightness of the light emitting portion of a lighting device, the larger the glare, and the lower the brightness, the less its presence.

It has also been experienced that glare increases as the apparent size of the light emitting portion having a brightness several hundred times as high as that adapted to the human eye increases, and that the glare increases as the size decreases. Known to be. It is considered that these phenomena greatly contribute to the impression of brightness in the illuminated room (referred to as brightness here).

By giving the light emitting portion of the lighting device an appropriate brightness, the light emitting portion gives a clue that the interior of the room is illuminated, so that the entire room feels bright. On the contrary, if the brightness of the light emitting part of the lighting equipment becomes too high, glare occurs, which causes darkness in the entire room. Considering these facts, it is considered that the luminance of the light emitting portion of the lighting fixture that increases the sense of brightness in the room has an appropriate luminance range.

However, since there is no data quantitatively examining these relationships so far, it is unclear what illumination conditions should be applied to the bright area of the light emitting portion in order to increase the sense of brightness. Met.

Therefore, the inventors have aimed to clarify the conditions of the brilliance region of the light emitting portion which can increase the sense of brightness in the room, and the brightness, size, and
An experiment was conducted to evaluate the sense of brightness in the room under the condition that the shape and brightness of the background of the shining area were changed variously. [Outline of Experiment] The experimental apparatus is composed of two boxes (test box and reference box) each containing a 1/5 scale office model as shown in FIG. 9A. That is, the boxes are placed in front of the observer, and the partition 100 is provided between them. Figure 9
(B) shows the inside of each box as seen by the observer. As shown in FIG. 9, a desk and a beam-shaped lighting fixture are arranged in each of the boxes, and a light source that uniformly illuminates the entire room is installed at a position where the observer cannot directly see the light source. The light emitting part is installed only in the test box at a position visible to the observer, and the light emitting part has its size (solid angle), brightness,
The background brightness can be changed independently. Since the light emitting part of this experimental device has no brightness unevenness, the entire light emitting part is considered to be a bright region.

In the experiment, each observer was seated at a predetermined position one by one, and each experimental condition in which the luminance of the light emitting portion, the solid angle and the background luminance were variously changed was presented in the test box. After the observer had sufficiently adapted to each experimental condition, the illuminance of the reference box was adjusted until the sense of brightness in the room of both the test box and the reference box became the same. Illumination of reference box (Er) after adjustment
And the illuminance (Et) of the test box was measured. After the measurement
About the impression of the light emitting part of the test box "Dazzling",
Asked them to answer "shining" or "bright". [Experimental Results] In analyzing the data adjusted by all the observers, a value (Er / Et) obtained by dividing Er by Et was obtained as an equal brightness sensitivity illuminance ratio. In other words, this equal brightness sense illuminance ratio (E
r / Et) expresses the ratio of the illuminance of both boxes when the test box having a light emitting part in the field of view and the reference box having no light emitting part have the same sense of brightness in the room. If the illuminance ratio (Er / Et) is equal to or less than 1, there is no effect of increasing the sense of brightness in the room due to the light emitting unit.
A larger value has the effect of increasing the sense of brightness in the room by the light emitting unit, and a larger value means a greater effect.

As an example, in FIG. 10, the shape of the light emitting portion is a rectangle with an aspect ratio of 1/6, and the equal brightness sense illuminance ratio (Er / Et)
Indicates. 10 (a), (b), and (c) show the equal brightness sensitivity illuminance ratio (Er / Et) for background luminances of 50, 100, and 200 [cd / m ² ], respectively. It is clear from FIG. 10 that (1) the iso-brightness illuminance ratio is approximately in the range of 0.8 to 1.3, and (2) the iso-brightness illuminance ratio is the background brightness. Is 50 [cd / m ² ], the equal brightness sense illuminance ratio (Er /
Et) is high and the background brightness is high, the value of the equal brightness sensitivity illuminance ratio (Er / Et) is low, and the background brightness is 200 [cd /
m ² ], the iso-brightness illuminance ratio (Er / Et) is lower than 1. (3) The iso-brightness illuminance ratio (Er / Et) is specific to the brightness / size of the light emitting part. There is a peak value at the time of the condition.

In order to elucidate in more detail the range in which the peak of the iso-brightness illuminance ratio (Er / Et) is obtained, the background brightness of 50 [cd / m] where the iso-brightness illuminance ratio (Er / Et) was high. ^[2 ] The equal brightness sensitivity illuminance ratio (Er / Et) w was compared on the coordinate with the size of the light emitting portion as the horizontal axis and the brightness as the vertical axis. FIG.
1 is the result. The coordinates of the center point of each circle in FIG. 11 indicate each experimental condition (luminance and size of the light emitting part), and the number in each circle indicates the value of the equal brightness sensitivity illuminance ratio (Er / Et). Show.
The diameter of each circle is proportional to the value of the illuminance ratio of equal brightness (Er / Et). Further, based on this, high-order interpolation was performed to obtain an “iso-brightness-sensitive illuminance ratio (Er / Et)” line corresponding to the contour line of the map. As an example, FIG. 12 shows iso-brightness-sensitive illuminance ratio (Er / Et) lines under the condition that the background luminance is 50 [cd / m ² ] shown in FIG. 11 (a). From this figure, it can be seen that there is a portion with a high brightness equal illuminance ratio (Er / Et) in a certain specific range. For example, if the brightness of the two rooms differs by more than 20%, it can be recognized by anyone that there is a big difference in the brightness of the two. Therefore, here, the equal brightness illuminance ratio (Er / Et) By performing a regression analysis on the range of 1.2 or more, the range where the iso-brightness illuminance ratio (Er / Et) is high was quantitatively specified. As a result, the range of the equation (1-1) sandwiched between the straight line (1) and the straight line (2) in FIG. 13 could be obtained. −0.18 log ω + 2.79 ≦ log L ≦ −0.54 log ω + 1.77 (1-1) where L is the brightness of the light emitting unit [unit: cd / m ² ] and ω is the apparent size of the light emitting unit (solid angle). ) [Unit: sr (steradian)]. The range between these two straight lines is the range where the equal brightness sensitivity illuminance ratio (Er / Et) is 1.2 or more.
Furthermore, if the illuminance ratio (Er / Et) for equal brightness sense is increased by 30% or more, an extremely large sense of brightness is felt.
Within the range of formula 1), the effect of increasing the indoor brightness is 1.
A range of 3 or more where the effect of increasing the sense of brightness is extremely high was examined. As a result, within the range of the equation (1-1), about 3.
The range of 6 ≦ logL ≦ 4.3 is equal brightness sense illuminance ratio (Er / Et)
Was found to be in the range of 1.3 or more.

On the other hand, regarding the subjective evaluation of the impression of the light emitting part under each experimental condition of the test box, the category in which 50% or more of the total number of responses obtained in the experiment was obtained was examined under the experimental conditions. It was represented as a category of the impression of the light emitting part. The result is shown in FIG. The coordinates and diameter of each circle in FIG. 14 are the same as those in FIG. 11, and the type of the shaded pattern of each circle indicates the category of the impression of the light emitting unit. Of these, the experimental condition in which the light emitting portion was evaluated as “shining” and E _r / E sandwiched between the straight line (1) and the straight line (2) in FIG.
Comparing with the range where _t is 1.2 or more, it was found that they are almost the same.

By the same procedure as above, the data under the condition that the shape of the light emitting portion is different was analyzed, and the range in which the sense of brightness in the room was increased was obtained. As a result of comparing the respective ranges, it is clear that the expression (1-2) is appropriate as a range in which the sense of brightness in the room increases to more than 1.2 in the equal brightness sense illuminance ratio (Er / Et). I chose 3.3 ≦ log L ≦ −0.3 log ω + 2.63 (1-2) where L is the brightness of the light emitting unit [unit: cd / m ² ], and ω is the apparent size (solid angle) of the light emitting unit [unit. : Sr (steradian)]. Furthermore, among these, particularly, the areas in which the sense of brightness in the room increases by about 1.3 or more in the illuminance ratio (Er / Et) of equal sense of brightness are represented by the approximate expressions (2) and (3). Is. logL ≦ −0.3logω + 2.63 (2) 3.64 ≦ logL ≦ 3.90 (3) where L is the brightness of the light emitting unit [unit: cd / m ² ] and ω is the apparent size of the light emitting unit. (Solid angle) [unit: sr (steradian)].

Regarding the background brightness, it is clear that the effect of increasing the sense of brightness in the room is higher when the background brightness is lower than 200 [cd / m ² ] even under the condition that the aspect ratio of the light emitting portion is different. It was [Conclusion] The following conclusions were made from the above experiments. (1) If the relationship between the brightness L of the luminescent area of the light emitting portion and the solid angle ω of the light emitting portion is 3.3 ≦ logL ≦ −0.3logω + 2.63 (1-2), there is no light emitting portion or light is emitted. It was revealed that the psychological brightness is about 1.2 times or more higher than the room where the brightness of the part is extremely low in terms of the equal brightness illuminance ratio (Er / Et). (2) If the relationship between the brightness L of the luminous area of the light emitting portion and the solid angle ω of the light emitting portion is logL ≦ −0.3logω + 2.63 (2) 3.64 ≦ logL ≦ 3.90 (3), light emission Psychological brightness is about 1.3 times higher than the equivalent brightness illuminance ratio (Er / Et) compared to a room with no parts or where the brightness of the light emitting part is extremely low and there is no shining area. Became clear. (3) When the background brightness of the light emitting unit is about 100 [cd / m ² ] or less, the effect of increasing the psychological brightness is enhanced. (4) Psychological brightness is closely related to the impression of the light emitting part, such as whether the light emitting part is bright or dazzling.
It was revealed that the brighter the light emitting part, the brighter it feels.

In general, the luminaire, which is visible to the observer in a range smaller than the vertical angle of 60 degrees, that is, near the observer's head, is far from the observer's daily line of sight (horizontal direction). Therefore, it is said that it does not affect the observer's sense of glare, and has no presence.
Therefore, it is considered that the shining area of the light emitting portion exerts the most effect in improving the sense of brightness when the vertical angle is in the range of about 60 to 90 degrees. Further, in order to achieve the original purpose of the luminaire, that is, to secure the required horizontal illuminance, the amount of light emitted in the direction directly below the luminaire, that is, in the direction of about 0 to 60 degrees in the vertical direction is suppressed. Is not appropriate. In other words, the light distribution in the direction of the vertical angle of 0 to 60 degrees, which is necessary for the illumination to secure the horizontal plane illuminance, is
For lighting, it is considered appropriate to refrain from limiting the brightness and to allocate the light distribution in the direction of the vertical angle of 60 to 90 degrees, which is effective for the effect of brilliance, to the brilliant region that improves the sense of brightness in the room. For this reason, in the present invention, the conditions under which the shining region of the light emitting portion has the effect of improving the sense of brightness in the room are mainly considered in the range of vertical angles of 60 to 90 degrees. However, for example, even if this condition is satisfied in the range of 40 degrees to 90 degrees, substantially the same effect can be obtained, and therefore it is not necessary to limit the vertical angle to 60 degrees to 90 degrees in practical use. In addition, a light source and a luminaire to secure horizontal illuminance are placed side by side, and when the luminaire does not need the function to secure horizontal illuminance, especially in the case of a luminaire with a small apparent size, Considering the effect of the area on the brightness, the formula (1-2), or the formulas (2) and (3) are not limited to the range of 60 to 90 degrees and You can also set the conditions to meet.

On the other hand, FIG. 17 (a), (b),
(C) and typical conventional lighting fixtures including the lighting fixture shown in FIG. 18 will be compared. For example, the brightness of the light emitting portion of the exposure type lighting fixture of FIG. 17A is 800 when viewed from any position regardless of the apparent size (solid angle ω).
The light distribution is 0 [cd / m ² ], and the light distribution is represented by Expression (4).

LogL = 3.9 (4) Therefore, for example, this lighting fixture is installed in a room with a ceiling height of 2.5 m, and the fixture is placed at a position where the observer is seated (eye height 1 .2 m), the solid angle is 2.7 × 10 ⁻³ [sr] and the brightness is 8000 [cd /
m ² ], so glare is extremely bad.

This glare occurs not only when viewed at a vertical angle of 60 degrees, but also when viewed at a vertical angle of 60 to 80 degrees.

Further, the apparent size (solid angle ω) and brightness of the light emitting portion of the conventional bottom open type lighting fixture of FIG. 17 (b) are in the range shown in FIG. 18, and the light distribution is ( It is expressed by the equation 5).

LogL = 0.38logω + 4.63 (5) Therefore, for example, this luminaire is installed in a room with a ceiling height of 2.5 m, and the position where the observer is seated (eye height 1. Two
From m), when viewed at a vertical angle of 60 degrees, the solid angle is
Since the luminance is about 10,000 [cd / m ² ] at 2.7 × 10 ^-2 [sr], glare is extremely severe.

Furthermore, this glare occurs not only when viewed at a vertical angle of 60 degrees, but also when viewed at a vertical angle of 60 to 80 degrees.

Further, since the conventional glare control type luminaire has low brightness, it is outside the area shown in FIG. 15 and does not intersect the area of the present invention at all.

On the other hand, there are various conventional light distribution devices for downlight. For example, the light distribution of a lighting fixture that uses a halogen lamp has a narrow angle and high directivity,
Installed in a room with a ceiling height of 2.5 m, and set the lighting fixture to a vertical angle 6 from the position where the observer sits (eye height 1.2 m).
When viewed at 0 degrees, its solid angle is 9.0 × 10 ^-4 [sr]
Since the brightness is about 5000 [cd / m ² ], glare is severe.

When viewed at a vertical angle of 80 degrees, the solid angle is about 3.5 × 10 ^-5 [sr] and the brightness is about 1700 [cd].
/ M ² ], so it feels dark.

In addition, some conventional downlight luminaires have wide-angle light distribution and low directivity.

For example, the light distribution of a luminaire for a 60 W krypton bulb is expressed by equation (6) in the relationship between the apparent size (ω) of the light emitting portion and the brightness (L). (However, in the expression (6), only the range of ω ≦ 6 × 10 ⁻⁴ is linearly approximated.) LogL = 0.067logω + 3.8 (6) Therefore, for example, this lighting fixture is used for the ceiling. When installed in a room with a height of 2.5 m and viewed from an observer's seated position (eye height of 1.2 m) at a vertical angle of 60 degrees, the solid angle is about 5.8 × 10 ^-4 [ luminance is 4800 [cd /
m ² ], so that there is a problem that glare is extremely high.

The luminance distribution of a general chandelier is expressed by the equation (7).

LogL = 4.3 (7) Therefore, in the range of (1-) of the present invention, the apparent size of the light source is within a very small solid angle range of less than 3 × 10 ⁻⁶ [sr]. It intersects with the area of the formula (2) that has the effect of increasing the sense of brightness.

However, the solid angle of 3 × 10 ^-6 [sr] is 2 × 10 when the lighting fixture installed in a room with a ceiling height of 2.5 m is replaced when viewed from a vertical angle of 60 degrees.
^{Since it is -5} [m ² ] (circle with a diameter of 5 mm), the light source is very small and the luminous flux is too small to be used as a light source for illumination.

It should be noted that all of the lighting fixtures described above have a high effect of increasing the sense of brightness in the room due to the shining region of the light emitting portion of the lighting fixture, which is represented by the formulas (2) and (3). There is no overlap at any vertical angle of 60 to 90 degrees.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a lighting fixture showing an embodiment for realizing the present invention based on the results described in FIGS. 15 and 16.

In FIG. 1, 1 is a light source, which uses a 60 W krypton lamp. Reference numeral 2 is a reflecting mirror, 3 is a specular reflection portion, 4 is a diffuse reflection portion as a light emitting portion, and 5 is a ceiling material. This luminaire is circular with a radius of 0.1 m.

The mirror-reflecting portion 3 is formed of a mirror-finished plastic material into a spheroidal surface having the lamp center as the first focal point.

The diffuse reflection section 4 is made of a white plastic material having a satin finish, and its surface is finished as a perfect diffusion surface which reflects light uniformly in all directions. For this reason, the diffuse reflection part 4 looks the same in luminance when viewed from any direction, and also looks uniform in luminance. Therefore, the entire diffuse reflection section 4 can be regarded as a bright area.

The light emitted from the light source 1 in the direction directly below the luminaire directly illuminates the work surface. Further, all the light emitted from the light source 1 toward the specular reflection portion 3 of the reflecting mirror 2 is reflected toward the second focus, and finally illuminates the work surface.

The light for illuminating these work surfaces has a vertical angle of 0.
It is limited to the direction of 60 degrees.

The other part of the light emitted from the light source 1 is reflected by the diffuse reflector 4.

Since the diffusive reflection part 4 is finished to be a perfect diffusing surface, the luminaire is viewed from the observer by a vertical angle of 60 ° to 90 °.
The brightness of the diffuse reflection part 4, which is a shining area, is 2000 [cd] when viewed from any position in the predetermined area viewed in the direction of degrees.
/ M ² ]. For this reason, the diffuse reflection unit 4 has a (1-
It is possible to satisfy the condition of the expression (2) and improve the sense of brightness in the room.

If the diffuse reflection part 4 which is the light emitting part is not a perfect diffusion surface, a uniform luminance surface may not be obtained. Generally, when looking at a region on the same plane where the brightness gradually changes like a wall illuminated by a spotlight, it can be seen that the brightness is obviously changed by the human naked eye.
It is said that the reason is that the brightness is 1/3 or less of the maximum brightness. For this reason, in the case of a light emitting portion having uneven brightness, a region having a brightness of ⅓ or more of the maximum brightness is defined as a bright region, and the brightness in the bright region is considered to be the same as the maximum brightness.

With the same configuration as the luminaire of FIG. 1, the radius is set to 0.
When the reflectance is changed so that the brightness becomes 4400 [cd / m ² ] when viewed from the range of vertical angle of 60 degrees to 90 degrees with the lighting fixture having a length of 04 m, the above equations (2) and (3) are obtained. It is possible to realize a lighting fixture that satisfies the condition of the formula and has a higher effect of increasing the sense of brightness in the room.

This luminaire has, for example, a depth of 100.
When installed in an office with a ceiling height of 2.5 m and a height of 2.5 m or more, when an observer looks at a luminaire mounted on the ceiling 100 m away horizontally, the vertical angle of the luminaire to the observer is about 88. .4 degrees, but the solid angle of the bright area at that time is about 6.5 × 10 ^-9 [sr],
The brightness is 4400 [cd / m ² ].

In the case of such a small luminaire, the solid angle when looking up from directly under the luminaire (vertical angle 0 °) is 0.
Since the brightness is about 003 [sr] and the brightness satisfying the formula (1-2) is in the range of about 2000 to 2600 [cd / m ² ], the brightness of a small vertical angle (vertical angle 0 to 60 degrees) is obtained. By setting it to 2300 [cd / m ² ], it is possible to satisfy the expression (1-2) at any position in a predetermined area determined based on the light emitting unit, not in the living room. For this reason,
You can make the room feel bright. However, the horizontal illuminance becomes low.

Further, when the reflectance is gradually changed from the upper part to the lower part of the diffuse reflection part 4 so as to be seen from a distance (vertical angle approaches 90 degrees), the brightness becomes higher (1 It is possible to effectively utilize the range of the expression (2). However, it is necessary to use a low-power lamp or reduce the light by a filter so that the brightness of the light source is also reduced.

FIG. 2 is a schematic sectional view of another embodiment for realizing the present invention, which is shown in the relationship of FIGS. 15 and 16.

In FIG. 2, reference numeral 6 is a light source, and as in FIG. 1, a 60 W krypton lamp is used. 7 is a reflector, 8 is a diffusing panel, 9 is a brilliant light emitting part of the diffusing panel, 1
0 is a ceiling material. The entire opening of this luminaire is a circle with a radius of 0.08 m, and the solid angle thereof appears to be about 1.5 × 10 ⁻³ [sr] when viewed from a vertical direction of 60 degrees. The diffusion panel 8 is made of a donut-shaped acrylic, and has been subjected to a diffusion treatment so that the whole is diffused and transmitted,
The brilliant light emitting portion 9 therein has high transmittance.

Therefore, a part of the light emitted from the light source 6 directly or indirectly illuminates the work surface, but the other light is transmitted through the diffusion panel 8 and diffused.

When this luminaire is viewed from the vertical angle of 60 to 90 degrees, the light source 6 and the reflecting mirror 7 are not directly visible, but the diffuser panel 8 and the brilliant light emitting portion 9 are visible.

Of these, the brightness of the diffusion panel 8 is 6
3000 [cd when viewed from any vertical angle of 0 to 90 degrees
/ M ² ].

Further, the brightness of the brilliant light emitting portion 9 is 6
5000 when viewed from any vertical angle of 0 to 90 degrees
[Cd / m ² ]. The diffusing panel 8 and the brilliant light emitting portion 9 of the diffusing panel serve as a brilliant region, and each of
Since the condition of the equation (2) or the equations (2) and (3) is observed, the sense of brightness in the room is further improved.

FIGS. 3A and 3B are shown in FIGS.
6 is a front view and a schematic cross-sectional view of another embodiment of the wall bracket that realizes the present invention shown in FIG.

In FIG. 3, 11 'is a light source, and 6
It uses a 0 W krypton bulb. Reference numeral 12 'is a diffusion panel, which has a square shape with one side of 15 [cm].
A bright light emitting portion 13 'having a diameter of 4 cm is provided in the center thereof. A support tool 14 'supports the diffusion panel 12', and the support tool 14 'is supported by a wall mounting portion 16' that also serves as a socket of the light source 11 '. Wall mount 1
5'is fixed to the wall 16 'and is wired through it.

A part of the light emitted from the light source 11 'is transmitted and diffused through the bright light emitting portion 13'. At this time, the brightness of the diffusion panel 12 ′ is 50 to 60 [cd / m ² ].
Another part of the light emitted from the light source 11 'is emitted laterally from the light source to illuminate the room. When the brilliant light emitting portion 13 ', which is a brilliant region, is viewed at a distance of 1.45 m or more (
The condition of the expression (2) is satisfied, and the diffuser panel 12 'which is the background of the brilliance region also helps the brilliance increasing effect, so that the sense of brightness in the room is improved. In addition, the brilliant light emitting unit 1
When the luminance of 3'is 5000 [cd / m ² ], the conditions of the expressions (2) and (3) are satisfied, and thus the sense of brightness is further enhanced.

FIGS. 4A and 4B show FIGS. 15 and 1.
6A and 6B are a perspective view and a schematic cross-sectional view of a lighting fixture showing an embodiment for realizing the present invention shown in the relation of No. 6.

In FIG. 4, 11 is a light source, and 18 W
The compact fluorescent lamp of is used. Reference numeral 12 denotes a main body, which has a square cross section, and the inner dimension of one side thereof is 18 [cm].

A reflector 13 is attached inside the main body 12. The louver 14 has a shape in which a square having an outer angle of 18 [cm] is divided into nine small squares each having a side of 6 [cm] on four surfaces orthogonal to each other.

The center square of the nine squares is a brilliant reflecting mirror 15 as a light emitting portion, and the inner surface thereof is subjected to diffuse reflection processing such as white matte coating.

Eight peripheral portions surrounding the brilliant reflecting mirror 15 are background reflecting mirrors 16 as background light emitting portions, all inner surfaces of which are coated with aluminum vapor deposition, and designed so that light does not diffuse to the side. Has been done. Moreover, 17 is a ceiling material.

The light emitted directly from the light source 11 in the direction directly below the luminaire and the light reflected from the light source 11 by the reflection plate 13 and emitted in the direction directly below the illuminator illuminate the work surface.

Light emitted from the light source 11 directly to the brilliant reflecting mirror 15 of the louver 14 and the light source 11 from the reflector plate 1
The light reflected by 3 and emitted toward the shining reflection mirror 15 is
Diffuse reflection is performed by the shine reflecting mirror 15 that has been subjected to diffuse reflection processing,
The brightness of the luminaire appears to be 2000 [cd / m ² ] when the observer sees it from any of the vertical angles of 60 ° to 90 °. At this time, since the brightness reflection mirror 15 has a uniform brightness distribution, the brightness reflection mirror 15 entirely becomes a brightness region.

The other part of the light emitted from the light source 11 is reflected by the background reflecting mirror 16, and the background reflecting mirror 16 is
Specular reflection treatment is applied, and the brightness is 50 when viewed from any direction of the vertical angle of 60 to 90 degrees of the luminaire.
It looks below [cd / m ² ]. At this time, the background reflector 16
Serves as a background light emitting unit. This has the effect of increasing the sense of brightness in the room.

By changing the surface treatment of the brilliant reflecting mirror 15 from a white coating having a strong diffuse reflection to a surface having a slightly higher directivity, the brightness thereof is at a vertical angle of 60 degrees to 90 degrees.
It is 5000 [cd / m ² ] when viewed from any direction, and in that case, the brightness of the light emitting portion is felt, and the sense of brightness in the room is further improved.

Further, in the embodiment introduced here, the luminance of the lighting fixture is constant from any direction, but (1
It is possible to realize a lighting device that increases the sense of brightness in the room even if the light distribution has different brightness depending on the viewing direction as long as it is within a range that satisfies the expression (2) or the expressions (2) and (3).

As described above, the background of the light emitting portion is 1
When the brightness is higher than 00 [cd / m ² ], the light emitting part of the luminaire has less effect of increasing the sense of brightness in the room. Since the background reflecting mirror 16 which is a light emitting section is always kept at a low brightness,
There is an advantage that the sense of brightness in the room can be surely increased even when it is mounted on a ceiling having a high brightness exceeding 00 [cd / m ² ].

For example, in an office with a depth of 100 m or more and a ceiling height of 2.5 m, the observer can move at a horizontal distance of 10 m.
When you look at the lighting fixtures installed on the ceiling 0m away,
The vertical angle of the luminaire with respect to the observer is about 88.4 degrees, but the solid angle of the shining center reflecting mirror grating at that time is about 1.0 × 10 ^-8 [sr], and the brightness is Is 500
It is 0 [cd / m ² ].

Although a square lighting fixture using a fluorescent lamp is shown as an example here, there is a light emitting portion and a background surrounding the light emitting portion, and the relationship between the brightness of the luminescent area of the light emitting portion and the apparent size. Is (1-2) or (2)
Expressions (3) and (3) are satisfied, and the background brightness is 100 [cd
/ M ² ] or less, a halogen lamp, an incandescent lamp,
A small high-intensity lamp such as an HID lamp, an LED, an EL, or the like may be used, and the shape of the lighting fixture may be any shape, not necessarily a square shape.

Further, in this embodiment, the central portion of the lattice-shaped louver is used as the brilliant reflection portion, but the central portion does not necessarily have to be the brilliant light emitting portion, and the lattice at any position may be used as the brilliant reflection portion. .

Further, it is possible to use a plurality of gratings as the brilliant reflection portion instead of using only one grating as the brilliant reflection portion.

FIGS. 5A, 5B, and 5C are perspective views, schematic cross-sectional views, and louver members 22 of another embodiment for realizing the present invention shown in the relationships of FIGS. 15 and 16. It is a perspective view.

In FIG. 5, 18 is a light source, and 27
The compact fluorescent lamp of [W] is used. 19 is a main body, which has a square shape when viewed from directly below,
The inner dimension of that side is 300 [mm]. A reflector 20 is attached inside the main body 19.

The 21 louver has an outer edge of 300
It is a square of [mm], and has a lattice shape divided by the louver member 22 into 25 squares of about 60 [mm] on each side.

The inner surface of the louver member 22 has a light introducing portion 23.
The light guide portion 24 and the tip portion 25, and the surface thereof is formed of a light reflecting portion 26 as a background light emitting portion. Also, 27
Is a ceiling material.

The light emitted from the light source 18 is repeatedly reflected and absorbed inside the luminaire, but a part of the light is made incident on the inside from the light introducing portion 23 of the louver member 22, passes through the light guiding portion 24, and is then passed through the tip. It is diffused in the part 25.

At this time, the brightness of the tip 25 is 6
5000 [cd when viewed from any direction from 0 degrees to 90 degrees
/ M ² ].

The tip 25 of the louver member 22 has a width of 5 [m
m] and a length of about 300 [mm], it is a long and narrow rectangle, and its area is 0.0015 [m ² ], so the ceiling height is 2.5 [m].
When a luminaire using this louver is installed in the living room of a person, and the luminaire is viewed from the vertical direction of 60 degrees, the apparent solid angle of the tip 25 is about 1.1 × 10 ^-4 [sr]. Becomes

Since the relationship between the brightness of the tip portion 25 and the solid angle corresponds to the range of the equations (2) and (3), the tip portion 25 looks shining, which increases the sense of brightness in the room. The effect is obtained.

If the brightness of the tip portion 25 is 2000 to 44,
When it is set to about 00 [cd / m ² ], the entire tip portion 25 becomes a shining region, and the relationship between the brightness and the solid angle is (1-2)
Since the condition of the formula is satisfied, the sense of brightness in the room is improved.

Here, another part of the light emitted from the light source 18 is reflected by the light reflecting portion 26 on the surface of the louver member 22, and this light reflecting portion 26 has a curvature of the surface and a specular reflection. It has a characteristic in that it reflects a large amount of light in the direct downward direction, but it suppresses the reflection of light in the lateral direction, and the light reflecting portion 26 can be seen from any direction of vertical angles of 60 to 90 degrees. The brightness is 100 [cd / m ² ] or less. At this time, the light reflection portion 26 has the background brightness of the bright area.

In this embodiment, as the light source 18, 2
A 7 W compact fluorescent lamp was used, but in order to enhance the effect of improving the brightness, the brightness of the tip portion 25 is set to 500.
To achieve a high level of 0 [cd / m ² ], a compact and high-power fluorescent lamp may be used, or another lamp such as a halogen lamp, an incandescent lamp, or an HID lamp may be used.

The shape and size of the louver and lighting equipment may be arbitrary.

FIG. 6 is a schematic cross-sectional view of another embodiment realizing the invention according to the relationship of FIGS. 15 and 16.

In FIG. 6, 28 is a light source, and 60
A [W] krypton lamp is used.

Reference numeral 29 is a reflector, 30 is a main body, 31 is an opening, and 32 is a reflecting object as a light emitting portion, which is attached to a predetermined place near the light source by a linear body such as 32a, for example, at the lower end of the main body 300. Has been. 33 is a ceiling material.

The light emitted from the light source 28 is repeatedly reflected and absorbed by the reflecting plate 29 or the like attached to the body 30 of the luminaire, but finally emitted from the opening 31 of the luminaire directly below the luminaire. Be done.

Most of the light emitted from the opening 31 is used as light for illumination in the room, but the remaining part is reflected by the reflecting object 32.

The reflecting object 32 is a pseudo-conical shape in which the base has a diameter of 5 cm and a height of 5 cm, and the ridges are concavely curved. , Vertical angle 60
When the reflecting object 32 is viewed from a direction of 90 degrees to 90 degrees, the reflecting object becomes a shining area, and its brightness is always 2000 to
It is made to look like about 5000 [cd / m ² ]. The brightness of the reflective object 32, which is a bright area, is 2000 [cd
/ M ² ], the condition of formula (1-2) is satisfied and the sense of brightness increases. Further, at 5000 [cd / m ² ], the expressions (2) and (3) are satisfied, and the sense of brightness is further enhanced.

At this time, the linear body 32a is placed at a position where the reflecting object 32 is lowered by about 2.8 cm from the center of the opening 31.
When viewed from the direction of the vertical angle of 60 ° to 90 °, the reflecting plate 2 must be placed on the background when viewed from the vertical direction of 60 ° to 90 °.
9 is visible. For this reason, the reflection plate 29, which becomes the background light emitting portion of the reflection object 32 in the shining area, is mirror-finished so that the brightness in the direction of the vertical angle of 60 to 90 degrees is 100 [cd / m ² ] or less. As a result, it is possible to enhance the sense of brightness in any place where the lighting device is attached without being affected by the ambient light.

Regarding the shape and size of the reflecting object 32, the relationship between the brightness and the size thereof is expressed by equation (1-2) or (2).
Any condition is acceptable as long as the conditions of the formula and the formula (3) are satisfied.

On the other hand, as the light source 28, here, 60
Although the krypton lamp of [w] was used, the light source is not particularly limited.

Further, there is no limit condition regarding the shape and size of the opening 31.

Further, the effect of improving the sense of brightness in the room can also be obtained by attaching the reflecting object 32 alone to the existing lighting equipment.

However, when the brightness of the reflection plate 29 seen through the opening 31 is high, or the room in which the lighting device is installed is bright and the background brightness is too high, the effect of improving the brightness of the room is not obtained. Fades.

Further, instead of the reflecting object 32, if the relation between the brightness and the solid angle is within the range of the expressions (1-2) or (2) and (3), it is not the reflecting object but the light. A transparent object may be attached.

7 (a) and 7 (b) are shown in FIG. 15 and FIG.
6 is a perspective view and a schematic cross-sectional view of another embodiment for realizing the present invention shown in the relationship of FIG.

In FIG. 7, 34 is a light source, and 60
A [W] krypton lamp is used. Reference numeral 35 is a reflection plate, 36 is a main body, 37 is an optical fiber portion, 38 is a light introducing portion, 39 is a light emitting tip portion, 40 is a light diffusing portion as a light emitting portion, 41 is a glareless reflecting portion, 42 is an opening portion, 43 is a ceiling. It is a material. The light diffusing unit 40 has a cylindrical shape with a diameter of 1 [cm].

The light emitted from the light source 34 is repeatedly reflected and absorbed by the reflector 35 attached to the main body 36 of the luminaire, and finally emitted from the opening 42 of the luminaire directly below the luminaire. Most of the light emitted from the opening 42 is used as light for indoor illumination.

On the other hand, a part of the light emitted from the light source 34 is directly incident on the light introducing portion 38 of the optical fiber portion 37, is transmitted through the inside of the optical fiber portion 37, is guided to the tip portion 39, and is emitted there. .

The light radiated from the tip portion 39 is reflected by the light diffusion portion 4
It is spread by 0. The brightness of the light diffusing section 40 is made so that when the light diffusing section 40 is viewed from the direction of vertical angle of 60 to 90 degrees, the brightness of the light diffusing section 40 always appears to be about 5000 [cd / m ² ]. .

As a result, the light diffusing section 40 becomes a bright area, which increases the sense of brightness in the room.

Regarding the brightness and size of the light diffusing section 40, any condition is acceptable as long as the relationship between them is within the range of the expressions (1-2) or the expressions (2) and (3).

As the light source 34, here, 60
Although the krypton lamp of [w] was used, the type of light source is not particularly limited.

Further, there is no limit condition regarding the shape and size of the opening 42.

FIGS. 8A and 8B are shown in FIGS.
6A and 6B are a perspective view and a schematic cross-sectional view of a lighting fixture showing another embodiment for realizing the present invention shown in the relation of FIG.

In FIG. 8, 44 is a light source, and 36 W
The compact fluorescent lamp of is used.

Reference numeral 45 denotes a main body, which has a width of 300 [m
m] and a length of 450 [mm].
A reflection plate 46 is attached inside the main body 45.

47 is a louver, 48 is a bright light source, 49 is a bright light emitting portion, and 50 is a ceiling material. The main body 45, the reflection plate 46, and the louver 47 of this luminaire are the same as those of the conventional luminaire, but a plurality of shining light sources 48 different from the light source 44 are installed on the side surface of the main body 45 so as to cover the outer periphery of the luminaire. The point is different.

The light emitted from the brilliant light source 48 passes through the brilliant light emitting section 49.

The brilliant light emitting section 49 has a length of 30 [m]
m] in the shape of a square, and even if the brilliant light emitting section 49 is viewed from any direction of vertical angles of 60 ° to 90 °, the brightness looks like 10,000 [cd / m ² ]. In this case, the bright light emitting portion 49 is the bright area.

For example, when this luminaire is attached to the ceiling of a room with a ceiling height of 2.5 [m] and viewed from the direction of a vertical angle of 60 degrees, the solid angle of the brilliant light emitting section 49, which is a brilliant region, is Since it is 1.15 × 10 ⁻⁴ [sr],
It is within the range shown by the equation (1-2) in which the sense of brightness in the room increases.

Also, when it is viewed from the direction of a vertical angle of 85 degrees (corresponding to a position separated by 14.9 [m]), its solid angle is 4.0 × 10 ^-6 [sr]. Therefore, it is within the range shown by the equation (1-2) in FIG. 15 in which the feeling of brightness in the room increases.

In this embodiment, the main body 4 of the lighting equipment is
Although the brilliant light emitting portion 49 is attached to the side surface of No. 5, the relationship between the brightness of the brilliant region and the solid angle is in the range of FIG. 15 or FIG. It may be attached at any position. Since the effect of increasing the brightness is lost when the brilliant light emitting portion 49 is hidden by the main body 45 or the like, in this embodiment, the brilliant light emitting portion 49 is attached so as to surround the outer periphery of the main body 45 so that it can be seen from any direction. is there.

Further, in the embodiment introduced here, the brightness of the lighting fixture is constant, but the formula (1-2) or
It is possible to realize a luminaire having an increased sense of brightness in the room even if the light distribution is such that the brightness is not constant as long as the expressions (2) and (3) are satisfied.

Further, by providing a light source for the brilliant light emitting portion, which is different from the light source of the main body of the lighting equipment, as in this embodiment, the following advantages can be obtained.

For example, when this lighting device is attached to an office work room where a plurality of people are working, when many people are working, the light source of the main body of the lighting device that illuminates the room is naturally turned on. However, when there are no more people within a certain range and the work surface illuminance for work becomes unnecessary,
By turning on the light source of the brilliant light emitting unit, it is possible to maintain the sense of brightness in the room even if the illumination of the main body of the lighting fixture in that range is turned off.

By doing so, it is possible to reduce the illumination energy without causing depression in the room. In particular, in the case of a lighting system that uses an illuminance sensor, the illuminance level in the room is sensed in advance, and when the illuminance in the room is secured by outside light, the light source of the brilliant light emitting part is turned on and the light source of the fixture body is dimmed. It can be dimmed or turned off by a circuit.

The relationship between the brightness and the solid angle is (1-2)
The present invention can also be applied to an existing lighting facility by separately attaching the brilliant light emitting unit in the range of the formula, or the formulas (2) and (3) to the main body of the lighting fixture, instead of mounting it on the ceiling or wall.

Further, if an illuminance sensor is attached to an independent luminescent light emitting section, a system can be provided for turning on the light source of the luminescent light emitting section when the illuminance in the room decreases and the user feels dark.

As a power source for the light source of the brilliant light emitting section,
If the battery with abundant electricity storage is built in, it can be easily installed in the existing lighting facility without wiring work.

[0140]

As described above, according to the present invention, the brightness of the luminescent area of the light emitting portion is L [unit: cd / m ² ], and the apparent size of the luminescent area is the solid angle ω [unit: sr (steradian)]. And the brightness L of the shining area is 3.3 ≦ logL ≦ −0.3l
By having more than one shining area in the range of ogω + 2.63, the office worker does not get direct glare, the ceiling surface does not feel dark, and the work surface is provided with the desired illuminance. It is effective in giving a bright feeling to the whole room and giving a lively atmosphere.

Further, 3.48 ≦ logL ≦ −0.3logω +
By having one or more brilliance regions in the range of 2.63 and 3.64 ≤ logL ≤ 3.90, the brilliance of the light source can be felt in addition to the above effect, and the whole room can be made brighter. it can.

Further, when a large number of light emitting portions are present on the ceiling in a large room, it is rather uncomfortable for the eyes to have a large number of light shining areas. Therefore, as described above, the predetermined area is at a predetermined angle (60 degrees). ) In addition to the above condition, it is more preferable to limit the angle to a predetermined angle (for example, 80 degrees) or less. In other words, it is desirable not to see the shining part in the distance. For example, in FIG. 4, this can be achieved by making the reflection of the brilliant reflecting mirror 15 not to be largely diffused or by giving a certain curvature.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an indoor lighting device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 3 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 4 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 5 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 6 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 7 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 8 is a configuration diagram of an indoor lighting device according to another embodiment of the present invention.

FIG. 9 is a diagram showing an experimental device.

FIG. 10 is a bar graph showing the experimental results of the ratio of equal brightness and illuminance (Er / Et) (background brightness: 50, 100, 200 [cd / m ² ]).

FIG. 11 is a pie chart of an experiment result of an equal brightness sense illuminance ratio (Er / Et) (background brightness 50 brightness [cd / m ² ]).

FIG. 12: “Equal brightness sense illuminance ratio (Er / Et)” line (background brightness 50 brightness [cd / m ² ])

FIG. 13: Condition of equal brightness sense illuminance ratio (Er / Et) of 1.2 or more (background brightness 50 brightness [cd / m ² ])

FIG. 14: Subjective evaluation of impression ratio of illuminance (Er / Et) with equal brightness sense (background luminance 50 luminance [cd / m ² ])

FIG. 15 is a range in which the effect of increasing the sense of brightness is high (the range where the illuminance ratio of uniform brightness (Er / Et) is 1.2 or more).

FIG. 16 is a range in which the effect of increasing the sense of brightness is extremely high (a range where the uniform brightness sense illuminance ratio (Er / Et) is 1.3 or more).

FIG. 17 is an external view of a conventional typical indoor lighting fixture.

FIG. 18 is a diagram showing a luminance distribution of a conventional lighting fixture (luminance of a light emitting portion at each vertical angle).

FIG. 19 is a diagram showing the brightness of a conventional lighting fixture (relationship between the size of the light emitting unit and the brightness).

[Explanation of symbols]

 1 Light Source 2 Reflecting Mirror 3 Specular Reflecting Part 4 Diffuse Reflecting Part 5 Ceiling Material 6 Light Source 7 Reflecting Mirror 8 Diffusing Panel 9 Brightness of Diffusing Panel Light Emitting Part 10 Ceiling Material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Mukai 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (11)

[Claims] 1. The brightness of a shining area on a light emitting section in a living room is L [unit: cd / m ² ] and the apparent size of the shining area is a solid angle ω [unit: sr (steradian)]. At this time, the relationship between the luminance L and the solid angle ω is set to 3.3 ≦ logL ≦ −0.3log ω + 2.63 or logL ≦ −0.3log ω + 2.63 3.64 ≦ logL ≦ 3.90. An indoor lighting device, wherein at least one shining area to be filled is visible on the light emitting unit at any position in a predetermined area in the living room that is determined based on the light emitting unit in the living room. 2. The brightness of a shining area on a light emitting part of one lighting fixture is L [unit: cd / m ² ], and the apparent size of the shining area is a solid angle ω [unit: sr (steradian)]. Then, the relationship between the brightness L and the solid angle ω is 3.3 ≦ logL ≦ −0.3logω + 2.63 or logL ≦ −0.3logω + 2.63 3.64 ≦ logL ≦ 3.90 The indoor lighting device, wherein at least one shining region satisfying the condition is visible on the light emitting unit at any position in a predetermined area determined with the light emitting unit of the lighting device as a reference. 3. The indoor lighting device according to claim 1, wherein the predetermined area is an area that is not less than a predetermined angle and not more than a predetermined angle with respect to a vertical direction from an end or a center of the light emitting unit. . 4. The predetermined angle or more and the predetermined angle or less means
4. The angle is 60 degrees or more and 80 degrees or less.
Indoor lighting fixtures listed. 5. The indoor lighting device according to claim 1, wherein the predetermined area is an area that is a predetermined distance or more from a center of the light emitting unit. 6. The indoor lighting apparatus according to claim 1, further comprising a background light emitting unit having a brightness of a predetermined value or less near the light emitting unit. 7. The tip of the louver member guides a part of the light emitted from the light source to the inside and diffuses the light to form the light emitting portion, and the light reflecting portion of the louver member has the light reflecting portion. 7. The indoor lighting device according to claim 6, wherein the background light emitting portion is formed by reflecting another part of the light emitted from the light source. 8. A light source that emits light, and a lattice-shaped louver member formed of a plate member that reflects the light of the light source, wherein at least one lattice plate member of the louver member is provided from the light source. To form the light emitting portion by reflecting the light of, and a plate member of another lattice around the lattice forming the light emitting portion forms the background light emitting portion by reflecting the light from the light source. The indoor lighting device according to claim 6, wherein: 9. A light source that emits light, and a reflective object that is supported at a predetermined location near the light source and that reflects a part of the light emitted from the light source or a transmissive object that transmits a part of the light. The indoor lighting fixture according to claim 1, wherein the reflective object or the transmissive object is the light emitting unit. 10. A lighting fixture body embedded in a ceiling,
A light source that emits light, an optical fiber that guides a part of the light emitted from the light source, and a light diffusing unit that is attached to the tip of the optical fiber and that diffuses the guided light to the ceiling around the lighting fixture body. 7. The light diffusing unit is the light emitting unit.
The indoor lighting device according to any one of 1. 11. The indoor according to claim 1, further comprising: a light source for general illumination, and the light emitting section using a light source different from the light source for general illumination. lighting equipment.