JP5129607B2 - Lighting device - Google Patents

Description

  The present invention relates to an illuminating device that reduces the melatonin secretion inhibitory effect of illumination light.

  Conventionally, it is known that the color of illumination light affects a human biological rhythm. For example, if the light color of the illumination light is reddish like a light bulb before going to bed, the stimulation to the brain will be reduced compared to white light or daylight color light, and it will promote a smooth sleep of people. Can do. On the other hand, if the light color of the illumination light is a pale color such as a mercury lamp, the stimulation to the brain is strengthened and the human consciousness can be awakened. It is thought that melatonin secreted from the pineal gland of the brain is deeply involved in the effects of these light colors on human sleep.

  Melatonin has individual differences due to differences in life rhythm, etc., but generally it is secreted in a large amount from before sleep to early sleep, and it is thought that it promotes a decrease in body temperature and smooth sleep. In addition, it is known that the secretion of melatonin is more strongly suppressed when receiving light having a wavelength of around 464 nm. Therefore, it is possible to reduce the suppression of melatonin secretion by cutting a wavelength component around 464 nm from the illumination light so that a person can fall asleep smoothly at bedtime.

However, the light whose wavelength component near 464 nm is cut loses the blue wavelength component, and thus becomes an unnatural light color as illumination light. Therefore, by providing an optical filter that restricts the average light transmittance at a wavelength of 480 to 505 nm, which has a relatively high melatonin secretion suppressing effect and a low contribution to light color, to approximately 30% or less, while preventing melatonin secretion suppression. An illumination device that can keep illumination light in a relatively natural color is known (for example, see Patent Document 1).
JP 2006-259079 A

  However, in the illuminating device disclosed in Patent Document 1, the entire light exit surface is covered with a filter that restricts the transmission of the blue wavelength component, so that the color of the illumination light appears different from the natural color (yellow The whole room where the lighting device is installed is illuminated with such a light color, and is not suitable for a person to perform visual work such as reading under the lighting device, for example.

  Therefore, the present invention solves the above-mentioned problem, and when performing visual work under illumination light, the visual object looks natural and does not impair human operability, and the visual work is performed. An object of the present invention is to provide a lighting device that allows a person who does not have light of a wavelength that suppresses secretion of melatonin to reach a person who can sleep smoothly.

In order to achieve the above object, the invention of claim 1 is an illumination device comprising a light source and a housing that emits light from the light source and has a light exit surface substantially parallel to a floor surface. The light exit surface is provided with a louver composed of a plurality of flaps, and each flap is disposed so that its normal direction is substantially parallel to the floor surface, and the human body out of the light from the light source. Contrary to this, the filter is configured to reduce the transmission of light of a wavelength component having an action of suppressing the secretion of melatonin, and both the flaps are arranged along two directions whose normal directions are substantially orthogonal to each other. The louver is composed of two kinds of combinations, and the louver has a developed state in which the normal direction of the flap is substantially parallel to the floor surface and extends over the entire surface of the light exit surface, and the light exit surface There is no flap at the bottom, Below the serial light emitting surface over between the reduced state of being opened entirely, characterized in that it is constructed telescopically along a direction parallel to the floor surface.

  According to the first aspect of the present invention, the light exit surface is provided with a louver composed of a plurality of flaps, and the flaps are arranged so that the normal direction thereof is substantially parallel to the floor surface, and against the human body. Because it is configured as a filter that reduces the transmission of light that suppresses the secretion of melatonin, light from the light source is directly irradiated directly below the light exit surface, which may impair the workability of human visual work. Absent. In addition, in the direction deviating from the direction directly below the light exit surface (the direction in which the light directly enters the eye), the light whose stimulation is weakened by the flap is irradiated, so the melatonin secretion is not suppressed to the human body, It does not hinder the smooth sleep of the user who is not doing visual work.

(First embodiment)
Hereinafter, an illumination device according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The illuminating device 1 of this embodiment includes a light source 2 and a housing 4 that emits light from the light source 2 and has a light emitting surface 3 that is formed substantially parallel to the floor surface F. Moreover, the illuminating device 1 is equipped with the louver 6 (refer FIG. 2) formed by combining the several flap 5 on the light-projection surface 3 at the grid | lattice form. Each flap 5 is disposed such that its normal directions ra1 and rb1 are parallel to the floor surface F, and among the light from the light source 2, a wavelength component having an action of suppressing secretion of melatonin to the human body. The filter is configured to reduce the transmission of light.

  The lighting device 1 is normally applied to an embedded lighting fixture that is embedded in the ceiling C and emits light in the direction of the floor surface F. In addition, the solid line arrow in a figure shows the direct light L1 radiate | emitted from the light source 2, and a dotted line arrow and a dashed-dotted line arrow show the light L2 which permeate | transmitted the flap 5. FIG.

  A general-purpose light source is used as the light source 2, and for example, an annular fluorescent lamp, a bulb-type fluorescent lamp, a halogen lamp, an incandescent lamp, an LED, or the like is used. In addition, the light source 2 may be configured such that a plurality of LEDs having different emission colors are arranged and light of any color can be emitted by appropriately controlling the dimming of each LED.

  The housing 4 is made of a substantially cylindrical structural material, and is formed such that a surface in contact with the ceiling C surface of the housing 4 is the light emitting surface 3. As the material of the housing 4, for example, a metal such as an aluminum alloy or a resin material such as polycarbonate or PPS is used. The shape and dimensions of the housing 4 are not particularly limited, but are preferably designed to have an embedding hole size and device embedding height comparable to those of a general-purpose embedded lighting fixture.

  As shown in FIG. 2, the louver 6 is formed by combining flaps 5a and 5b having the same vertical width w in a vertical and horizontal lattice shape, and each flap 5a and 5b has its normal direction (arrow ra1, rb1) is fixed to the light emitting surface 3 so as to be parallel to the floor surface F and orthogonal to each other. In other words, the louver 6 is configured by combining two types of flaps, a vertical flap 5a and a horizontal flap 5b orthogonal to the vertical flap 5a. 2 shows a mode in which the louver 6 attached to the light emitting surface 3 of the housing 4 is viewed obliquely from below.

  Each of the flaps 5a and 5b is made of, for example, a translucent resin containing an orange fluorescent coloring material. The width w in the vertical direction is such that the lower ends of the flaps 5a and 5b slightly protrude from the ceiling C surface, and the louver 6 Is designed as large as possible within a range that can be accommodated in the housing 4 (see FIG. 1). The reason why the width w of the flaps 5a and 5b is designed to be large will be described later.

  When the lower ends of the flaps 5a and 5b protrude downward and larger than the ceiling C surface, the colors of the flaps 5a and 5b themselves may be conspicuous and the color balance of the ceiling C may be lost. However, by reducing the protrusion amount as much as possible Such a problem can be avoided. For the same reason, it is also effective to apply a color that matches the ceiling C surface to the lower ends of the flaps 5a and 5b.

  In addition, each of the flaps 5a and 5b reduces transmission of a wavelength component having an action of suppressing the secretion of melatonin to the human body, preferably a wavelength component in the vicinity of a wavelength of 460 nm, of the light emitted from the light source 2. It is configured.

  Further, the translucent resin that is a main constituent material of the flaps 5a and 5b is not particularly limited as long as it is a translucent resin, and a known material is appropriately used. Examples thereof include acrylic resins, polystyrene resins, vinyl chloride resins, polylactic acid resins, silicon resins, unsaturated polyester resins, and the like, and these may be used alone or in combination of two or more. Preferably, an acrylic resin that is excellent in translucency and weather resistance and applicable to a wide range of uses is used.

  Next, the operation of the lighting device 1 of the present embodiment will be described with reference mainly to FIG. As described above, the light emitting surface 3 of the lighting device 1 is provided with the louver 6 including the flaps 5a and 5b in which the normal directions ra1 and rb1 are parallel to the floor surface F, and the flaps 5a and 5b are connected to the human body. Since the filter is configured to reduce the light of the wavelength component having an action of suppressing the secretion of melatonin, the light directed directly from the light source 2 does not pass through the flaps 5a and 5b and becomes the direct light L1. The light traveling in the direction inclined by a predetermined angle becomes the light L2 transmitted through the flaps 5a and 5b. For convenience of explanation later, light L2 having a relatively small inclination angle θ is indicated by a dotted arrow, and light L2 having a relatively large inclination angle θ is indicated by a one-dot chain arrow.

  Since the direct light L1 does not pass through the flaps 5a and 5b, the color rendering property of the light from the light source 2 (for example, white light) is maintained as it is. Therefore, for example, when the user P1 performs a visual work such as placing the table T below the irradiation surface 30 and reading the book B on the table T, the workability of the user P1 is not deteriorated. Will not be damaged. The direct light L1 includes light of a wavelength component that suppresses the secretion of melatonin and prevents a person from falling asleep smoothly. There is no direct incidence on the eyes of the user P2 whose direction is horizontal or slightly downward.

  On the other hand, a part of the light L2 that has passed through the flaps 5a and 5b travels in a direction inclined at a predetermined angle θ from the vertical, so that it directly enters the eyes of the user P2 who is not performing visual work. Since the light of the wavelength component that suppresses the secretion of melatonin is reduced, the stimulus given to the user P2 is small, and the smooth sleep of the user P2 is not hindered. Of the light emitted from the light source 2, the light L2 having a large inclination angle θ from the vertical (a dashed-dotted arrow) is likely to be directly incident on the eyes of the user P2, but the flaps 5a and 5b have a large inclination angle. Is transmitted a plurality of times, the light of the wavelength component that suppresses the secretion of melatonin is greatly reduced, and the stimulation given to the user P2 is small. For the reasons described above, the larger width w of the flaps 5a and 5b is advantageous because it can give a larger number of transmissions to the light emitted at the same inclination angle θ.

  Further, the louver 6 is configured by combining two types of flaps 5a and 5b whose normal directions are orthogonal to each other in a lattice shape, and therefore, out of light emitted from the light source 2 at a predetermined angle θ with respect to the vertical. Most of the light passes through one of the vertical and horizontal flaps 5a and 5b. Accordingly, light with a reduced wavelength component that suppresses the secretion of melatonin is irradiated relatively uniformly in the horizontal direction below the illumination device 1. In other words, the light having a reduced wavelength component that suppresses the secretion of melatonin below the illumination device 1 is not irradiated in any direction.

(Second Embodiment)
An illumination device according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4A and 4B. The illumination device 1 of the present embodiment is different from the first embodiment only in the configuration of the louver, and the other configurations are the same. FIG. 3 shows a mode in which the louver 26 attached to the light emitting surface 3 in this embodiment is viewed obliquely from below.

  Similar to the louver 6 of the first embodiment, the louver 26 of the present embodiment is configured by combining vertical flaps 25a and horizontal flaps 25b in a lattice shape, and each of the flaps 25a, 25b The normal direction (arrows ra2, rb2) is arranged so as to be parallel to the floor surface F and orthogonal to each other, and the lateral flap 25b is located at a position where the normal direction rb2 is orthogonal to the floor surface F. It is configured to be rotatable to (the position indicated by the two-dot chain line in FIG. 3). Hereinafter, the solid line position in FIG. 3 of the flap 25b is referred to as a normal position, and the two-dot chain line position is referred to as a rotation position.

  Specifically, as shown in FIG. 3, the lateral flap 25 b has a rotation support shaft 27 at one edge along the longitudinal direction, and both ends of the rotation support shaft 27 are located on the casing 4. It is rotatably supported by a bearing (not shown) provided on the side. In addition, a slit 28 is provided at a location where the flap 25b intersects the flap 25a, and the free ends of the flaps 25b are connected to each other by a link 29, and all the flaps 25b in the lateral direction are rotated (arrows). t). FIG. 4A shows an aspect of the louver 26 viewed from below when all the flaps 25b in the lateral direction are in the normal position, and an aspect of the louver 26 viewed from below when all the flaps 25b are in the rotational position. As shown in FIG. When all the flaps 25b are in the rotation position, almost the entire surface of the light emitting surface 3 is covered with the flaps 25b that are tilted horizontally.

  In addition, each of the flaps 25a and 25b is configured as a filter that reduces the transmission of light having a wavelength component that has an action of suppressing the secretion of melatonin to the human body in the light from the light source 2 as in the first embodiment. Has been.

  Next, the effect | action of the illuminating device 1 of this embodiment is demonstrated. Also in the present embodiment, as in the first embodiment, the light traveling from the light source 2 directly downward is not transmitted through the flaps 25a and 25b, but becomes direct light L1, and the light traveling in a direction inclined at a predetermined angle is the flap 25a, The light L2 transmitted through 25b is obtained. Since the direct light L1 does not pass through the flaps 25a and 25b, the color rendering property of the light (for example, white light) of the light source 2 is maintained as it is, and when the user P1 performs visual work, the color discrimination property is lowered. Without impairing the workability of the user P1. Further, since the direct light L1 is traveling only in a substantially downward direction, it does not directly enter the eyes of the user P2 who is not performing visual work.

  On the other hand, a part of the light L2 transmitted through the flaps 25a and 25b travels in a direction inclined by a predetermined angle θ from the vertical, so that it directly enters the eyes of the user P2 who is not performing visual work. Since the light of the wavelength component that suppresses the secretion of melatonin is reduced, the stimulus given to the user P2 is small, and the smooth sleep of the user P2 is not hindered.

  Further, since the posture of the lateral flap 25b can be changed as described above, for example, when the user finishes the visual operation, the posture of the lateral flap 25b is manually moved from the normal position to the rotational position. (FIG. 4 (a) to FIG. 4 (b)), and almost all of the light emitted from the light source 2 toward the floor F passes through the flap 25b and suppresses the secretion of melatonin. The light can be reduced. In this case, even in a position directly below the lighting device 1, illumination is performed with light with less stimulation, and an environment in which the user can shift to sleep more smoothly can be achieved.

  In addition, a rotation drive device (not shown) such as a motor is connected to one end of the rotation support shaft 27 so that the rotation of the rotation drive device can be controlled by a remote controller, so that the user can move the flap 25b in the lateral direction. It is also possible to remotely control the changes instead of manually.

  In addition, the vertical flap 25a whose posture cannot be changed is not a filter that reduces the transmission of light of a wavelength component having an action of suppressing the secretion of melatonin to the human body, but is a normal translucent resin. May be.

(Third embodiment)
An illumination device according to a third embodiment of the present invention will be described with reference to FIGS. 5 (a), 5 (b) and FIG. The illuminating device 1 of this embodiment also differs from the first embodiment only in the configuration of the louver, and the other configurations are the same. The louver 36 of this embodiment is configured in a pantograph shape that expands and contracts in a direction parallel to the floor surface F, and FIG. FIG. 5 (b) shows a state in which the louver 36 is reduced to one side and the state in which the lower part of the light emitting surface 3 is fully opened is viewed from below. Show.

  As shown in FIG. 6, the louver 36 of the present embodiment includes a shaft assembly 37 that is assembled to be extendable and a rail body 38 that supports the shaft assembly 37 with respect to the housing 4. The shaft assembly 37 has a large number of shafts 37a that are axially connected so that the crossing angle can be changed along a plane close to the light emitting surface 3, and the crossing angle can be changed along a plane far from the light emitting surface 3. In this way, a large number of shafts 37b that are axially connected and a flap 31 stretched between the shafts 37a and 37b are provided. 5A and 5B, the shaft 37a and the shaft 37b are seen to overlap each other. Further, the flaps 31 are stretched between all the shafts 37a and 37b, but only some of the flaps 31 are shown in FIG.

  The operation for changing the crossing angle between the shafts 37a and the operation for changing the crossing angle between the shafts 37b is made by configuring the shafts connecting the shafts 37a and the shafts connecting the shafts 37b to the common shaft 32. And the shaft assembly 37 as a whole can be changed between a state where it is developed in a pantograph shape (FIG. 5A) and a state where it is reduced (FIG. 5B). The normal direction (arrow r3) of each flap 31 is always parallel to the floor surface F regardless of the change in the state of the shaft assembly 37 as described above. In addition, each flap 31 is configured as a filter that reduces transmission of light having a wavelength component that has an action of suppressing secretion of melatonin from the light source 2 to the human body.

  The rail body 38 is composed of a channel-shaped rail 38a and a rail 38b arranged so that the concave grooves face each other, and a roller 33a and a shaft provided at the end of the shaft 37a of the shaft assembly 37, respectively. A roller 33b provided at an end of 37b supports the shaft assembly 37 so as to be movable in the groove.

  Next, the operation of this embodiment will be described. First, the case where the shaft assembly 37 is in the developed state as shown in FIG. 5A will be described. In this case, since the normal direction r3 of the flap 31 is parallel to the floor surface F, the flap 31 operates in substantially the same manner as in the first embodiment. That is, the light traveling directly from the light source 2 does not pass through the flap 31 and becomes the direct light L1, and the light traveling in the direction inclined by a predetermined angle becomes the light L2 transmitted through the flap 31. Since the direct light L1 does not pass through the flap 31, the color rendering property of the light of the light source 2 is maintained as it is, and when the user P1 performs visual work, the color discrimination is not deteriorated and the workability of the user P1 is impaired. Absent. Further, since the direct light L1 is traveling only in a substantially downward direction, it does not directly enter the eyes of the user P2 who is not performing visual work. A part of the light L2 transmitted through the flap 31 travels in a direction inclined at a predetermined angle θ from the vertical, so that it directly enters the eyes of the user P2 who is not performing visual work. However, the flap 31 suppresses the secretion of melatonin. Since the light of the wavelength component is reduced, there is little stimulus given to the user P2, and the smooth sleep of the user P2 is not hindered.

  On the other hand, when the shaft assembly 37 is changed to the contracted state shown in FIG. 5B by the user, the normal direction r3 of the flap 31 is maintained parallel to the floor surface F. Since the whole is reduced, the lower part of the light emitting surface 3 is fully opened. In this case, most of the light emitted from the light source 2 does not pass through the flap (filter) 31 and is irradiated in the direction of the floor F without reducing the light of the wavelength component that suppresses the secretion of melatonin. This state is preferably selected, for example, when the user needs to wake up more strongly during the day to concentrate on visual work.

The figure which shows the structure and operation example of the illuminating device which concern on the 1st Embodiment of this invention. The perspective view which looked at the louver in the same illuminating device from diagonally downward. The perspective view which looked at the louver of the illuminating device which concerns on the 2nd Embodiment of this invention from diagonally downward. The bottom view of a louver when the flap of the horizontal direction in the lighting device exists in a normal position. The bottom view of a louver when the flap of the horizontal direction in the lighting device is changed into a rotation position. The bottom view of a louver when the shaft assembly of the illuminating device which concerns on the 3rd Embodiment of this invention is expand | deployed. The bottom view of a louver when the shaft assembly of the lighting device is reduced. The perspective view which shows a part of shaft assembly in the illumination device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Light source 3 Light emission surface 4 Case 5, 5a, 5b Flap (filter)
6 Louvers 25a, 25b Flap (filter)
26 louver 31 flap (filter)
36 louver F floor ra1, rb1, ra2, rb2, r3 Normal

Claims (1)

A lighting device comprising: a light source; and a housing that emits light from the light source and has a light emitting surface substantially parallel to a floor surface,
The light exit surface includes a louver composed of a plurality of flaps,
Each of the flaps is arranged so that the normal direction thereof is substantially parallel to the floor surface, and out of the light from the light source, light of a wavelength component having an action of suppressing the secretion of melatonin to the human body. It is configured as a filter that reduces transmission ,
The flap is composed of two kinds of combinations in which both of the normal directions are arranged along two directions substantially orthogonal to each other and movable.
The louver has a deployed state in which the normal direction of the flap is substantially parallel to the floor surface and extends over the entire surface of the light exit surface, and the flap does not exist below the light exit surface. The lighting device is configured to extend and contract along a direction parallel to the floor surface between a reduced state in which the lower part of the light emitting surface is fully open .

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