TW201930781A - Lighting device - Google Patents

Abstract

To offset the direction of a lighting head to a front side directly lower side of the lighting head without adjusting the direction of the lighting head. This lighting head (4) has a light source (5), a reflective plate (6), and a diffusion plate (7). The light source (5) is disposed to face the reflective plate (6) in an interior space which is defined by a curved surface shape of the reflective plate (6). An optical axis (A) of light output from the light source (5) faces a vertical direction in a state in which the lighting head (4) faces a directly lower side. The reflective plate (6) has a curved surface shape, which is asymmetrical with respect to the optical axis (A), and guides, in a specific direction, the reflected light obtained by reflecting emission light such that an irradiation area formed on an irradiation surface is offset to a specific direction with respect to the directly lower side of the lighting head (4) in a state in which the lighting head (4) faces the directly lower side. The diffusion plate (7) is mounted in an opening of the reflective plate (6), and diffuses the reflected light such that the light intensity of the irradiation area becomes uniform.

Description

   Lighting equipment   

The present invention relates to a lighting device including a lighting head, and more particularly to a reflection structure of light emitted from a light source.

Conventionally, a lighting device including a lighting head is known. For example, Patent Literature 1 discloses a lighting fixture including an LED (Light Emitting Diode) mounting substrate, a frame, and an LED substrate supporting plate. The LED mounting substrate is mounted with an LED element that projects short-wavelength light. The frame system has a reflecting surface, and the reflecting surface is provided with a wavelength conversion portion that emits converted light to the concave portion by short-wavelength light of the LED element. The LED substrate supporting plate is arranged on the inner side of the opening edge portion of the frame body, and the inner side surface is set to face the bottom surface of the recessed portion. The LED substrate supporting plate is an LED mounting substrate on which the bottom surface of the recessed portion with the light emitting surface of the LED element facing the reflecting surface is mounted. In addition, it is described that an image of a light source of an LED element cannot be seen directly.

Patent Document 2 discloses a lamp including a plurality of LEDs. The plurality of LEDs are arranged vertically with an interval between the lamps in the longitudinal direction thereof using an LED carrier. Each LED emits light in a predetermined solid angle area around the center direction of the light. The cube corner area is a lamp reflection plate for indirect light emission toward the lamp. The number of LEDs and / or the spacing of the LEDs are selected in such a way that all the solid corner areas of the LEDs overlap at least partially after being reflected by the light reflecting plate through the light reflecting plate. The distance between the separated LEDs is at least 0.2 to 2.5 times.

Patent Document 3 discloses a lighting device that can efficiently use light from a light source for lighting. The lighting device includes a ring light source and a reflecting member. The reflecting surface of the reflecting member is a concave curved surface formed in a space by winding a curve formed by a part of an ellipse having two focal points around a central axis. The positional relationship between each LED and the reflecting surface is determined so that all the light within the effective light distribution angle of the optical axis of each LED including the annular light source touches the reflecting surface, and the Each LED is irradiated with light that has been reflected by the reflecting surface.

[Prior technical literature]

[Patent Literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-300138.

Patent Document 2: Japanese Patent Application Publication No. 2015-511017.

Patent Document 3: Japanese Patent Application Laid-Open No. 2017-133984.

In the conventional lighting equipment, the irradiation area formed on the irradiation surface by the irradiation of light is located directly below the lighting head in a state where the lighting head is directed downward. However, depending on the user's use situation, it is usually easier to use if the irradiation area is not directly below the lighting head but is located in front (front) of the lighting head. In this case, for example, it is assumed that the eyes of the user reading a book or the like that has been placed in the irradiation area may be blocked by the head. In this situation, although the direction of the illuminating head can be adjusted to obliquely forward, the originally rounded irradiation area will be deformed into an oval shape, not only the edge portion will flow, but the boundary will become blurred. In bad situations, it may happen that the user is looking directly at the light source.

     [Summary of the Invention]           (Problems to be solved by the invention)     

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to form an irradiation area that is shifted more forward than directly below the illumination head without adjusting the direction of the illumination head.

In order to solve the above-mentioned problems, a first invention provides a lighting device including a mounting table, a lighting head, and an arm. The arm connects the installation table and the illumination head. The lighting head includes a first sub-light source, a second sub-light source, a first reflecting plate, and a second reflecting plate. The second sub-light source is arranged to be offset further forward than the first sub-light source. The first reflecting plate has a curved surface shape that is asymmetric with respect to the optical axis of the light emitted from the first sub-light source, and the first irradiation area formed on the irradiation surface with the illumination head facing directly below is opposite to the illumination head. The method of shifting directly below directly forwards the reflected light reflected by the light emitted from the first sub-light source to a predetermined direction. The second reflecting plate is disposed forwardly offset from the first reflecting plate and has an asymmetric curved surface shape with respect to the optical axis of the light emitted from the second sub-light source, and the lighting head faces directly below The second irradiation area formed on the irradiation surface in a state is shifted further forward than the illumination head and overlaps at least a part of the first irradiation area, so that the reflected light reflected by the light emitted from the second sub-light source is guided. To the predetermined direction.

A second invention provides a lighting device including at least a lighting head. The lighting head includes a first sub-light source, a second sub-light source, a first reflecting plate, and a second reflecting plate. The second sub-light source is disposed more offset forward than the first sub-light source. The first reflecting plate has a curved surface shape that is asymmetric with respect to the optical axis of the light emitted from the first sub-light source, and the first irradiation area formed on the irradiation surface with the illumination head facing directly downward is directly opposite the illumination head. The bottom is shifted further forward so that the reflected light reflected by the light emitted from the first sub-light source is guided to a predetermined direction. The second reflecting plate is disposed forwardly offset from the first reflecting plate and has an asymmetric curved surface shape with respect to the optical axis of the light emitted from the second sub-light source, and the lighting head is directed directly downward. The second irradiated area formed on the irradiated surface is shifted further forward than the illuminating head and overlaps at least a part of the first irradiated area, so that the reflected light reflected by the light emitted from the second sub-light source is guided. To the predetermined direction.

Here, in the first invention or the second invention, it is preferable that the inclination of the optical axis in the second sub-light source with respect to the vertical direction is greater than the inclination of the optical axis in the first sub-light source with respect to the vertical direction. In addition, a first sub-light source may be arranged in the front center of the lighting head, and two second sub-light sources may be arranged in the left and right sides of the lighting head. Further, a diffuser plate may be further provided on the optical axis of the reflected light, and the reflected light is diffused at a fixed angle. In this case, in a state where the diffusion plate has been removed, it is preferable that at least a part of the first irradiation area and the second irradiation area overlap each other. Moreover, it is preferable that the reflection characteristics of the front side edge portions as the first reflection plate and the second reflection plate reflect such that the angle of the reflected light with respect to the vertical direction gradually decreases as the edge portions toward the front side gradually decrease. In addition, the asymmetric curved surface shapes as the first reflection plate and the second reflection plate may have a cross-sectional shape inclined with a parabola with respect to the optical axis of the light emitted from the first sub light source and the second sub light source.

According to the present invention, a reflecting plate can be provided for each sub-light source, and the reflected light can be guided to a predetermined direction by each reflecting plate. By combining a plurality of optical systems in this manner, it is possible to overlap at least a part of the irradiation area while shifting the irradiation area formed on the irradiation surface from directly below the illumination head.

1‧‧‧lighting machine

2‧‧‧Setting table

3‧‧‧ arm

4‧‧‧lighting head

5‧‧‧ light source

5a to 5d ‧‧‧ sub-light sources

6, 6a to 6e‧‧‧ reflector

7‧‧‧ diffuser

8‧‧‧rotation axis

A‧‧‧ Optical axis

B‧‧‧ Focus

C‧‧‧ focus axis

D‧‧‧ Irradiated area

H‧‧‧Horizontal

θ, θ 1, θ 2‧‧‧ angle

Figure 1 is a front view of the lighting equipment.

Figure 2 is a side view of the lighting equipment.

Fig. 3 is a sectional view of the optical system of the first embodiment.

FIG. 4 is an explanatory diagram of a reflection structure.

FIG. 5 is an explanatory diagram of a reflection structure.

FIG. 6 is an explanatory diagram of a reflection structure.

FIG. 7 is an explanatory diagram of a reflection structure.

FIG. 8 is an explanatory diagram of an irradiation area formed by light from the illuminating head.

FIG. 9 is a schematic diagram showing a light intensity distribution of an irradiation area.

Fig. 10 is a sectional view of an optical system with an adjustment mechanism.

FIG. 11 is a plan view showing the arrangement of the optical system of the second embodiment.

Fig. 12 is a sectional view of the left and right optical systems.

Fig. 13 is a sectional view of the central optical system.

FIG. 14 is a schematic diagram showing a light intensity distribution of an irradiation area of each light source before diffusion.

FIG. 15 is a schematic diagram showing a light intensity distribution of an irradiation area of a synthetic light source before diffusion.

FIG. 16 is a schematic diagram showing a light intensity distribution of an irradiated area after diffusion.

Fig. 17 is a plan view of an optical system according to a third embodiment.

FIG. 18 is an explanatory diagram of an optical system according to a modification of the third embodiment.

FIG. 19 is a schematic diagram showing a light intensity distribution of an irradiation area before diffusion.

FIG. 20 is a schematic diagram showing a light intensity distribution of an irradiated area after diffusion.

    (First Embodiment)    

Fig. 1 is a front view of a lighting device according to this embodiment. Fig. 2 is a side view of the aforementioned lighting equipment. This lighting device 1 is used as a desk stand, and is structured with the theme of setting up the stand 2, the arm 3, and the lighting head 4. The mounting table 2 has a substantially cylindrical shape and is placed on a mounting surface such as a table. One end of the arm 3 is attached to the upper part of the installation base 2 and extends toward the upper side of the installation base 2. The illuminating head 4 is attached to the other end of the arm 3 at the rear. The direction of the illuminating head 4 is arbitrarily adjustable. Although the same figure shows the state where the illuminating head 4 is slightly forward, the state θ formed by the illuminating head 4 with respect to the horizontal line H is 0 degrees (θ = 0), and the state is directed downward. In the following description, the front-rear direction of the lighting device 1 is referred to as "X direction", and the left-right direction of the lighting device 1 is referred to as "Y direction". In this embodiment, in particular, the X-direction and the arm are used. The opposite direction on the 3 sides is defined as "front".

FIG. 3 is a cross-sectional view of an optical system built into the illumination head 4. The optical system includes a light source 5, a reflection plate 6, and a diffusion plate 7. The light source 5 is composed of a single light-emitting unit, which is equipped with one or a plurality of LEDs belonging to a light-emitting body, and faces the reflective plate 6 in an internal space defined by the curved shape of the reflective plate 6. Way to configure the light source 5. In the present embodiment, the light source 5 is arranged in a state (θ = 0) where the illumination head 4 is directed directly downward, and the optical axis A of the light that has been emitted from the light source 5 is arranged in a vertical direction. In addition, as described later, the light source 5 may be a plurality of light sources combining a plurality of light emitting units.

The reflecting plate 6 reflects the light emitted from the light source 5 in the direction of the optical axis A downward. Although the reflecting plate 6 has a curved shape that is symmetrical in the left-right direction (Y direction) with respect to the optical axis A of the light emitted from the light source 5, it has a relative shape in the front-rear direction (X direction) as shown in FIG. The optical axis A has an asymmetric curved surface shape. Thereby, the reflected light reflected by the reflecting plate 6 is not guided directly below the illuminating head 4 but is directed further forward.

It should be noted that the inclination and position of the light source 5 are not limited to those shown in FIG. 3, and can be appropriately determined according to the specifications of the actual product including the height of the desk lamp. For example, when the light source 5 is inclined forward, the light emitted from the illuminating head 4 may be guided further forward, and when the light source 5 is inclined backward, the reverse is possible. In addition, when the light source 5 is close to the reflection plate 6, the light irradiation area is diffused, and when the light source 5 is far away from the reflection plate 6, it is reversed.

Hereinafter, the reflection structure of this embodiment will be described in detail with reference to FIGS. 4 to 7. In this embodiment, as an example of the reflection plate 6, a reflection plate whose cross section in the front-back direction is parabolic is used. Specifically, the reference surface (the first term on the right) is classified into a spherical surface (k = 0) and an elliptical surface (-1 <k <0), parabola (k = -1), hyperbola (k <-1). In this embodiment, as an example, k = -1, r = 30, and h = 54.772 are set.

First, consider the parabola shown in Figure 4. In the case where light is emitted upward from the focal point B of the parabola, the reflected light reflected by the reflecting plate 6 is emitted as parallel light directly downward. Thereby, a substantially circular irradiation area (light field) is formed on the irradiation surface.

Next, as shown in FIG. 5, consider a situation where the light source 5 approaches the reflecting plate 6 side from the position of the focus B and the optical axis A is inclined only by a predetermined angle (for example, 30 degrees) with respect to the focal axis C of the reflecting plate 5. . Thereby, the emission direction of the reflected light is also inclined, so that it is guided obliquely forward rather than directly below the illumination head 4. The irradiation area formed on the irradiation surface is larger than that in FIG. 4 and has a three-day moon shape. In addition, by approaching the light source 5, the reflected light is no longer parallel light.

Next, as shown in FIG. 6, the inclination of the reflecting plate 6 is restored so that the light source 5 faces directly upward, and a part of the reflecting plate 6, that is, a portion lower than the light source 5 is cut by the horizontal line H. As a result, as shown in FIG. 7, in a state where the reflection plate 6 (illumination head 4) is directed downward, the reflected light from the illumination head 4 (reflection plate 6) is guided obliquely forward.

The cross-sectional shape of the reflection plate 6 is preferably an aspherical shape (parabolic shape), but it is not limited to this, and any shape may be adopted as long as it can guide the reflected light obliquely forward.

The diffusion plate 7 is provided on the optical axis of the reflected light emitted from the reflection plate 6 and diffuses the reflected light so that the light intensity of the irradiation area D becomes uniform. The diffuser plate 7 is also referred to as an LSD (light shaping Diffusers) diffuser plate. It forms fine unevenness on the surface of the film, and makes the incident light fixed by the refractive / diffraction effect of the uneven structure. Angular spread.

FIG. 8 is an explanatory diagram of an irradiation area formed by light emitted from the illumination head 4. In a state where the illuminating head 4 has been directed directly downward, the reflected light from the reflecting plate 6 is linearly emitted toward the oblique front. Although the reflected light is diffused when passing through the diffuser plate 7, the forward linearity is maintained due to its characteristics. Thereby, the irradiation area D (light field) is formed so as to be shifted further forward directly below the illumination head 4. In other words, in the X direction, the center of the irradiated area D is positioned further outside than the front end (front edge portion) of the illumination head 4.

FIG. 9 shows the light intensity distribution of the irradiated area D in a state where the diffusion plate 7 is not interposed. In FIG. 9, the lighter (white) area is displayed with higher display light intensity, and the darker (black) area is displayed with lower display light intensity. In the light intensity distribution shown in the same figure, the missing part in the lower part is the influence of the stage supporting the light source 5. By sandwiching the diffusion plate 7, the irradiation area D has a substantially circular and uniform intensity distribution.

Furthermore, the angle of intersection θ of the reflected light emitted from the reflecting plate 6 as the reflection characteristic of the reflecting plate 6 in the edge portion on the front side, as shown in FIG. 7, is the emission of the reflected light in a relatively vertical direction. It is preferable that the angle formed by the direction reflects as the edge portion toward the front side gradually decreases. As described above, this type of non-parallel light is achieved by causing the light source 5 to approach the reflecting plate 6 side from the position of the focal point B and tilt it. This can effectively prevent the boundary blur caused by the irradiation of the irradiation area (Spot light) formed on the irradiation surface to the front.

As described above, according to the present embodiment, by directing the reflected light reflected by the reflecting plate 6 to the front, the irradiation area D formed on the irradiation surface can be shifted more forward than directly below the illumination head 4. Thereby, even if the direction of the illuminating head 4 is not adjusted, it is possible to effectively avoid the situation where the user's eyes or the like reading a book placed directly below the illuminating head 4 are blocked by the illuminating head 4. Moreover, since the direction of the illuminating head 4 may be maintained directly below, it is not easy for the user to look directly at the light source 5 in addition to the clear shape of the irradiation area D which is originally round.

In addition, according to this embodiment, the reflection characteristics of the front side edge portion in the reflection plate 6 are reflected such that the angle θ of the reflected light with respect to the vertical direction gradually decreases as the edge portion toward the front side decreases. This can effectively prevent the boundary blur caused by the irradiation area D formed on the irradiation surface from flowing to the front.

Moreover, a typical so-called state in which the illuminating head faces downward is shown in FIG. 8, which refers to the lower surface of the illuminating head 4 (the surface of the diffuser plate 7 in FIG. 3) or the plane constituting the light source 5 with respect to the irradiation surface as Parallel state. However, although the lower surface and the like of the illuminating head 4 are effective judgment factors, they are not necessarily limited to this. Whether or not the lighting head is facing directly downward should still be judged individually for each actual product based on the diversity of the overall shape or structure (including the optical mechanism) in the actual product. In addition, in a system (lighting equipment) in which the adjustment of the illuminating head is performed by an electric motor or the like, in most cases, it is assumed that the state where the illuminating head is directed directly downward is an initial setting, so this original initial The direction of the illuminating head in the set state is a state facing directly downward. When the power is turned on in the initial setting state that has not been adjusted by the user, the system is operated by forming an irradiation area far ahead of the head directly below the illumination head, and the user can directly request the invention Convenience of lighting equipment.

In the present embodiment, the illuminating head 4 may be provided with a mechanism capable of changing the inclination of the optical axis of the light emitted from the light source 5. For example, as shown in FIG. 10, in the light-emitting unit constituting the light source 5, a rotation axis 8 extending in the Y direction of the lighting device 1 is provided, and the light source 5 can freely rotate within a predetermined range with the rotation axis 8 as a center. Way to pose. The rotation of the light source 5 may be performed by manually rotating the rotary shaft 8 or may be performed automatically by an electric motor or the like. This makes it possible to arbitrarily adjust the diffusion and intensity of the light emitted from the illuminating head 4, thereby further improving convenience for the user. Further, as long as a mechanism capable of changing the distance of the light-emitting unit (light source 5) from the focal point B of the parabola is provided, the focus adjustment is also possible. At this time, as long as the rotation axis 8 is eccentric with respect to the light emitting unit in advance, the tilt adjustment of the optical axis and the adjustment of the focal length can be performed simultaneously only by the rotation of the rotation axis 8. Furthermore, the inclination of the optical axis of the light emitted from the light source 5 and the positional relationship between the light source 5 and the focal point B may be configured to be fixed at an arbitrary inclination without providing a driving mechanism such as the rotation axis 8 And location.

    (Second Embodiment)    

In this embodiment, an example is described in which a plurality of optical systems (sub-light sources) according to the first embodiment described above are combined to form the irradiation area D in front of the head 4 directly below the illumination head 4.

FIG. 11 is a plan view showing the arrangement of the optical system of this embodiment. The three reflection plates 6a to 6c inside the illuminating head 4 are arranged to be offset in an interactive manner in the front-rear direction. The reflecting plates 6a to 6c are respectively provided with sub-light sources 5a to 5c constituting the light source 5. Fig. 12 is a sectional view of the left and right optical systems. Fig. 13 is a sectional view of the central optical system. When the inclination of the optical axis of the sub-light sources 5a and 5c relative to the vertical direction in the left and right optical systems is set to θ 1 and the inclination of the optical axis of the sub-light source 5 b in the central optical system is set to θ 2, θ 2 It is set to be larger than θ1. Since it is the same as the first embodiment except for the points described above, its description is omitted here.

FIG. 14 is a diagram showing the light intensity distribution of the irradiation areas D before the diffusion of the respective sub-light sources 5 a to 5 c before the diffusion. FIG. 15 is a diagram showing the light intensity distribution of the irradiation area D of the synthetic light source before the overlap of the three sub-light sources 5a to 5c, and FIG. 16 is a schematic diagram showing the light intensity distribution of the irradiation area D after the diffusion. As an example of the experiment, these figures show the distribution of the situation where the diameter of the illuminating head 4 is about 200 mm, the height of the desk lamp is 300 mm, and a wide range of circular light is emitted from a plane parallel to the installation surface. Compared with the irradiation area of the central light source ((b) in FIG. 14), the irradiation area of the light formed by the left and right sub-light sources ((a) and (c) in FIG. 14) is oriented forward and backward ( The left and right directions in the figure) are diffused, so that when the three lights overlap, light that is closer to a circle is formed (FIG. 15). The result of diffusing the synthetic light that is close to the above-mentioned circle through the diffuser plate 7 (FIG. 16) enables irradiation. The area D is closer to a circle, and the illuminance can also be maintained. In addition, the emitted light energy from the three optical systems is combined to form an irradiation area D more directly forward than directly below the illumination head 4.

As described above, according to the present embodiment, it is possible to shift the irradiation area D formed on the irradiation surface further forward than the illumination head 4 by combining a plurality of optical systems in the same manner as the first embodiment.

    (Third Embodiment)    

In the first embodiment and the second embodiment described above, although the irradiation area D is formed to be more forward than directly below the illuminating head as an example and explained, in this embodiment, a plurality of optical systems are combined (Sub-light source) and a large and perfect substantially circular irradiation area D formed immediately below the illuminating head 4 will be described as an example.

FIG. 17 is a plan view of an optical system according to this embodiment. The interior of the illuminating head 4 is configured by arranging the four reflection plates 6 a to 6 d formed by cutting the reflection plate 6 having the above-mentioned reflection characteristics in a point-symmetrical form, that is, an upper, lower, left, and right form. In the reflection plates 6a to 6d, a plurality of sub-light sources 5a to 5d constituting the light source 5 are arranged obliquely, respectively. However, the relative inclination of the child light sources 5a to 5d with respect to the reflection plates 6a to 6d is smaller than that of the first embodiment and the second embodiment, and the reflected light from each of the reflection plates 6a to 6d does not pass from the irradiation head 4 Set directly below the. As shown in FIG. 18, the above-mentioned reflecting plate 6 may be configured as a single annular reflecting plate 6e.

FIG. 19 is a diagram showing a light intensity distribution before diffusion of the irradiation region D by a plurality of sub-light sources 5a to 5d, and FIG. 20 is a diagram showing a light intensity distribution after diffusion by the diffusion plate 7. The four light fields are overlapped by being processed by the diffuser plate 7, and the light intensity is uniformized in a wide range and a substantially circular shape as the irradiation area D.

According to this embodiment, by combining a plurality of optical systems, it is possible to form a large-area and substantially circular light-irradiation region D with a uniform light intensity directly below the illumination head 4.

Furthermore, in the first and second embodiments described above, although the irradiation area D is formed so as to be shifted more forward than the position directly below the illumination head 4 as an example, the direction of the shift is described. The invention is not limited to the front, and the present invention broadly includes a form that is unidirectionally offset from the direction directly below the illumination head 4. The lighting device 1 is not limited to a desk lamp type, and includes a clip type or a hanging type. The lighting device 1 may be configured only by the lighting head 4.

Claims (7)

    A lighting machine includes: a setting table; a lighting head; and an arm connecting the setting table and the lighting head; the lighting head has: a first sub-light source; and a second sub-light source, which is more advanced than the first sub-light source The first reflecting plate is disposed offset from the front; the first reflecting plate has a curved surface shape asymmetrical to the optical axis of the light emitted from the first sub-light source, and is formed on the irradiation surface with the lighting head facing directly downward. In such a manner that the first irradiation area of the first offset area is shifted more forward than directly below the illumination head, the reflected light reflected from the light emitted from the first sub-light source is guided to a predetermined direction; and the second reflection plate is more than the first A reflecting plate is disposed further offset forward, has a curved surface shape asymmetrical to the optical axis of the light emitted from the second sub-light source, and is formed on the irradiation surface with the illumination head facing directly downward. In a manner that the second irradiation area of the second irradiation area is further shifted forward from directly below the illumination head and overlaps at least a part of the first irradiation area, so that the light emitted from the second sub-light source is reflected The reflected light is guided to a predetermined direction.         The lighting device according to claim 1, wherein the tilt of the optical axis in the second sub-light source with respect to the vertical direction is greater than the tilt of the optical axis in the first sub-light source with respect to the vertical direction.         The lighting device according to claim 1 or 2, wherein one of the first sub-light sources is arranged in the center of the front side of the head, and two of the second sub-light sources are arranged in the left and right side of the head.         The illuminating device according to claim 1 or 2, further comprising a diffusion plate which is provided on the optical axis of the reflected light and diffuses the reflected light at a fixed angle; in a state where the diffusion plate has been removed, the foregoing At least a part of the first irradiation area and the second irradiation area overlap each other.         The lighting device according to claim 1 or 2, wherein the reflection characteristics of the front side edge portion of the first reflecting plate and the second reflecting plate are based on the angle of the reflected light with respect to the vertical direction toward the front side. The edges are reduced in a way that reflects.         The lighting device according to claim 5, wherein the first reflecting plate and the second reflecting plate have a cross-sectional shape inclined parabolically with respect to an optical axis of light emitted from the first sub light source and the second sub light source. As the aforementioned asymmetric curved surface shape.         A lighting device includes at least a lighting head; the lighting head has: a first sub-light source; a second sub-light source is disposed more offset forward than the first sub-light source; a first reflecting plate has a The optical axis of the light emitted from the first sub-light source has an asymmetric curved surface shape, and the first irradiation area formed on the irradiation surface with the illumination head facing directly downward is more forward than the illumination head directly below. The second reflecting plate is arranged to be offset from the front side of the first reflecting plate and has a position relative to that of the first reflecting plate. The optical axis of the light emitted from the second sub-light source has an asymmetric curved surface shape, and the second irradiation area formed on the irradiation surface with the illumination head facing directly downward is more forward than the illumination head directly below. And moving and overlapping with at least a part of the first irradiation area to guide the reflected light reflected from the light emitted from the second sub-light source to a predetermined direction.