JPWO2019138459A1 - Lighting equipment - Google Patents

Abstract

An object of the present invention is to offset an illumination head forward from immediately below the illumination head without adjusting the orientation of the illumination head. An illumination head (4) has a light source (5), a reflector (6), and a diffuser (7). The light source (5) is arranged to face the reflector (6) in an internal space defined by the curved shape of the reflector (6). The optical axis (A) of the light emitted from the light source (5) is oriented vertically when the illumination head (4) is oriented directly below. The reflecting plate (6) has a curved surface shape that is asymmetrical with respect to the optical axis (A), and the illumination area formed on the illumination surface with the illumination head (4) facing directly below the illumination head (4). The reflected light, which reflects the emitted light, is guided in a specific direction so as to be offset in a specific direction with respect to immediately below 4). The diffusion plate (7) is attached to the opening of the reflection plate (6), and diffuses the reflected light so that the light intensity in the irradiation area becomes uniform.

Description

  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.

  2. Description of the Related Art Conventionally, lighting devices including a lighting head are known. For example, Patent Literature 1 discloses a lighting fixture having an LED mounting board, a housing, and an LED board support plate. An LED element that emits short-wavelength light is mounted on the LED mounting board. The housing has a reflecting surface provided with a wavelength conversion section that emits converted light by short-wavelength light of the LED element in a concave portion. The LED substrate support plate is provided inside the opening edge of the housing with the inner surface facing the concave bottom surface. The LED mounting board is attached to the LED substrate support plate with the light emitting surface of the LED element facing the bottom of the concave portion of the reflection surface. It also describes that the image of the light source of the LED element is not directly visible.

  Patent Literature 2 discloses a lamp including a plurality of LEDs vertically arranged in the length direction of the lamp at intervals using an LED carrier. Each LED emits light in a specific solid angle area around the center of the light beam. The solid angle area is directed to a lamp reflector for indirect lighting of the lamp. The number of LEDs and / or the spacing of the LEDs may be at least 0.2-2.5 times the distance between the LEDs where the solid angle areas of all the LEDs are furthest apart from each other and the illumination surface distance from the bottom of the lamp. , And at least partially overlap after reflection on the light reflector.

  Patent Literature 3 discloses an illumination device that can efficiently use light from a light source for illumination. This lighting device includes a ring-shaped light source and a reflecting member. The reflecting surface of the reflecting member is a concave curved surface formed in space by rotating a curve that forms a part of an ellipse having two focal points once around a central axis. The positional relationship between each LED and the reflecting surface is determined such that all light within the effective light distribution angle including the optical axis of each LED of the ring-shaped light source hits the reflecting surface, and the reflecting surface emitted from each LED of the ring-shaped light source. Irradiates the light reflected on the irradiation surface.

JP 2007-300138 A JP-T-2015-511017 JP 2017-133984 A

  In a conventional lighting device, an irradiation area formed on an irradiation surface by light irradiation is located immediately below the illumination head in a state where the illumination head faces directly below. However, depending on the use situation of the user, the usability is often better when the irradiation area is located not in front of the illumination head but in front of (in front of) the illumination head. As such a situation, for example, it is assumed that a user's line of sight reading a book or the like placed in the irradiation area is blocked by the illumination head. In this case, it is possible to cope by adjusting the direction of the illumination head diagonally forward, but not only the originally substantially circular irradiation area is deformed into an elliptical shape, but also the edge flows and the boundary becomes unclear, In the worst case, a situation may occur where the user is looking directly at the light source.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to form an irradiation area offset forward from immediately below an illumination head without adjusting the orientation of the illumination head.

  In order to solve such a problem, a first invention provides a lighting device including at least a lighting head. The illumination head has a light source and a reflector. The reflector has a curved surface shape that is asymmetrical with respect to the optical axis of the light emitted from the light source, and the illumination area formed on the illumination surface with the illumination head facing directly below the illumination head is located below the illumination head. The reflected light, which reflects the emitted light, is directed to a specific direction so as to be offset.

  A second invention provides a lighting device including an installation base, a lighting head, and an arm. The arm connects the mounting table and the lighting head. The illumination head has a light source and a reflector. The reflector has a curved surface shape that is asymmetrical with respect to the optical axis of the light emitted from the light source, and the illumination area formed on the illumination surface with the illumination head facing directly below the illumination head is located below the illumination head. The reflected light, which reflects the emitted light, is directed to a specific direction so as to be offset.

  Here, in the first or second invention, it is preferable that the reflection plate guides the reflected light forward to offset the irradiation area forward. In this case, it is preferable that the reflection plate reflects the light so that the ray angle of the reflected light with respect to the vertical direction gradually decreases toward the front edge as the reflection characteristic of the front edge. The reflector may have a cross-sectional shape in which a parabola is inclined with respect to the optical axis of light emitted from the light source, as an asymmetric curved surface shape. Further, a lens diffusion plate provided on the optical axis of the reflected light and diffusing the reflected light at a certain angle may be further provided so that the light intensity of the irradiation area becomes uniform. Further, the light source may include a plurality of sub light sources, and the reflector may reflect light emitted from each of the plurality of sub light sources and guide the emitted light forward as reflected light.

  According to the present invention, the reflected light is guided in a specific direction by the reflector, so that the irradiation area formed on the irradiation surface can be offset from immediately below the illumination head.

Front view of lighting equipment Side view of lighting equipment Sectional view of the optical system according to the first embodiment Illustration of reflective structure Illustration of reflective structure Illustration of reflective structure Illustration of reflective structure Explanatory drawing of the irradiation area formed by the light from the illumination head Diagram showing light intensity distribution in irradiation area Sectional view of optical system with adjustment mechanism FIG. 4 is a plan view showing an arrangement of an optical system according to a second embodiment. Cross section of left and right optical systems Cross section of the central optical system Diagram showing the light intensity distribution in the irradiation area of each light source before diffusion Diagram showing light intensity distribution of irradiation area of synthetic light source before diffusion Diagram showing light intensity distribution in irradiated area after diffusion Plan view of an optical system according to a third embodiment Explanatory drawing of an optical system according to a modification of the third embodiment. Diagram showing the light intensity distribution in the irradiation area before diffusion Diagram showing light intensity distribution in irradiated area after diffusion

(First embodiment)
FIG. 1 is a front view of a lighting device according to the present embodiment, and FIG. 2 is a side view thereof. The lighting device 1 is used as a desk stand, and mainly includes an installation table 2, an arm 3, and a lighting head 4. The mounting table 2 has a substantially columnar shape, and is mounted on a mounting surface such as a desk. The arm 3 has one end attached to an upper portion of the installation table 2 and extends upward from the installation table 2. An illumination head 4 is attached to the other end of the arm 3 at the rear. The direction of the illumination head 4 is adjustable. The figure shows a state in which the illumination head 4 faces slightly forward, and a state in which the angle θ formed by the illumination head 4 with respect to the horizontal line H is 0 degrees (θ = 0) is a state in which the illumination head 4 faces directly 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 is referred to as “Y direction”. In the present embodiment, in particular, the direction opposite to the arm 3 side in the X direction is “front”. And

  FIG. 3 is a cross-sectional view of an optical system built in the illumination head 4. This optical system has a light source 5, a reflection plate 6, and a lens diffusion plate 7. The light source 5 is constituted by a single light emitting unit on which one or a plurality of LEDs as light emitters are mounted, and faces the reflecting plate 6 in an internal space defined by the curved shape of the reflecting plate 6. Are located in In the present embodiment, the light source 5 is arranged such that the optical axis A of the light emitted from the light source 5 is oriented vertically when the illumination head 4 is oriented directly downward (θ = 0). As described later, the light source 5 may be a plurality of light sources obtained by 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. The reflecting plate 6 has a curved surface shape symmetrical with respect to the optical axis A of the light emitted from the light source 5 in the left-right direction (Y direction). As shown in FIG. 3, it has a curved surface shape that is asymmetric with respect to the optical axis A. As a result, the reflected light reflected by the reflecting plate 6 is guided not forward but directly below the illumination head 4.

  Note that the inclination and the position of the light source 5 are not limited to those shown in FIG. 3, but should be determined as appropriate according to the actual product specifications including the height of the stand. For example, when the light source 5 is tilted forward, light emitted from the illumination head 4 can be guided more forward, and vice versa. Further, when the light source 5 is brought closer to the reflector 6, the light irradiation area is expanded, and when the light source 5 is made farther from the reflector 6, the opposite is true.

  Hereinafter, the reflection structure according to the present embodiment will be described in detail with reference to FIGS. In the present embodiment, a parabolic cross section in the front-rear direction is used as an example of the reflection plate 6. Specifically, the following aspherical expression is used, and the base surface (the first term on the right side) is a spherical surface (k = 0), an elliptical surface (−1 <k <0), It is classified as an object plane (k = -1) or a hyperboloid (k <-1). In the present embodiment, as an example, K = -1, r = 30, and h = 54.772.

  First, consider a parabola as shown in FIG. When light is emitted upward from the focal point B of the parabola, the reflected light reflected by the reflector 6 is emitted immediately below as parallel light. Thereby, a substantially circular irradiation area (light field) is formed on the irradiation surface.

  Next, as shown in FIG. 5, the light source 5 is moved closer to the reflector 6 from the position of the focal point B, and the optical axis A is inclined by a predetermined angle (for example, 30 degrees) with respect to the focal axis C of the reflector 5. Think about the case. Thereby, the emission direction of the reflected light is also inclined, and the reflected light is guided obliquely forward instead of directly below the illumination head 4. The irradiation area formed on the irradiation surface is larger than in FIG. 4 and has a crescent shape. Further, by bringing the light source 5 closer, the reflected light is no longer parallel light.

  Then, as shown in FIG. 6, after returning the inclination of the reflection plate 6 so that the light source 5 faces directly above, a part of the reflection plate 6, that is, a portion below the light source 5 is cut along the horizontal line H. I do. As a result, as shown in FIG. 7, in a state where the reflection plate 6 (illumination head 4) faces directly below, the reflected light from the illumination head 4 (reflection plate 6) is guided obliquely forward.

  The cross-sectional shape of the reflecting plate 6 is preferably an aspherical shape (parabolic shape), but is not limited thereto, and any shape may be adopted as long as the reflected light can be guided obliquely forward. You may.

  The lens 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 S becomes uniform. The lens diffusing plate 7 is also called an LSD (Light Shaping Diffusers) diffusing plate, and forms fine irregularities on the surface of the film, and diffuses incident light at a certain angle by a refraction / diffraction effect by the irregular structure.

  FIG. 8 is an explanatory diagram of an irradiation area formed by light emitted from the illumination head 4. In a state where the illumination head 4 faces directly below, the reflected light from the reflector 6 is emitted linearly obliquely forward. This reflected light is diffused when passing through the lens diffusion plate 7, but its forward straightness is maintained due to its characteristics. As a result, the irradiation area D (light field) is formed so as to be offset forward from immediately below the illumination head 4. In other words, the center of the irradiation area D is located outside the front end (front edge) of the illumination head 4 in the X direction.

  FIG. 9 shows the light intensity distribution in the irradiation area D when the lens diffusion plate 7 is not interposed. In FIG. 9, a lighter (white) region indicates higher light intensity, and a darker (black) region indicates lower light intensity. In the light intensity distribution shown in the figure, the lower part is slightly cut off due to the influence of the base supporting the light source 5. With the lens diffusion plate 7 interposed, the irradiation area D has a substantially circular and uniform intensity distribution.

  As the reflection characteristics of the reflection plate 6 at the front edge, the intersection line angle θ of the reflection light emitted from the reflection plate 6, that is, the angle formed by the emission direction of the reflection light with respect to the vertical direction is shown in FIG. As described above, it is preferable that the light is reflected so as to gradually decrease toward the front edge. Such non-parallel light is realized by inclining the light source 5 from the position of the focal point B toward the reflector 6 as described above. Accordingly, it is possible to effectively prevent the irradiation area (spot light) formed on the irradiation surface from flowing forward and the boundary from being blurred.

  As described above, according to the present embodiment, the reflected light is guided obliquely forward by the reflector 6, so that the irradiation area D formed on the irradiation surface can be offset forward from immediately below the illumination head 4. . This makes it possible to effectively avoid a situation in which the user's line of sight reading a book placed directly below the illumination head 4 is blocked by the illumination head 4 without adjusting the orientation of the illumination head 4. In addition, since the direction of the illumination head 4 may be left directly below, the irradiation area D has a clear and substantially original circular shape, and a situation in which the user looks directly at the light source 5 is unlikely to occur.

  Further, according to the present embodiment, as the reflection characteristic of the front side edge of the reflection plate 6, the light is reflected so that the ray angle θ of the reflected light with respect to the vertical direction gradually decreases toward the front side edge. Thus, it is possible to effectively prevent the irradiation region D formed on the irradiation surface from flowing forward and the boundary from being blurred.

  It should be noted that the state in which the illumination head is directed directly downward is typically that the lower surface of the illumination head 4 (the surface of the lens diffusion plate 7 in FIG. 3) or the plane constituting the light source 5 is illuminated, as shown in FIG. Refers to a state parallel to the plane. However, although the lower surface of the illumination head 4 is an effective judgment factor, it is not necessarily limited to this. Whether or not the lighting head is facing directly down should be determined individually for each actual product, taking into account the diversity of the actual product in terms of overall shape and structure (including optical mechanisms). It is. Also, in a system (lighting equipment) in which the lighting head is adjusted by an electric motor or the like, a state in which the lighting head is facing directly downward is considered to be initially set in many cases. It is also possible to consider that the direction of the lighting head at the point is directly downward. If the system behaves so that the irradiation area D is formed ahead of immediately below the illumination head when the power is turned on in the initial setting state in which adjustment by the user is not performed, the convenience of the illumination device according to the present invention is improved. The user can be immediately appealed.

  In the present embodiment, the illumination 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, a light-emitting unit constituting the light source 5 is provided with a rotation axis 8 extending in the Y direction of the lighting device 1, and the light source 5 rotates around a predetermined range around the rotation axis 8. It is configured to be free. The rotation of the light source 5 may be performed by manually rotating the rotating shaft 8, or may be performed automatically by an electric motor or the like. Thereby, the spread and intensity of the light emitted from the illumination head 4 can be arbitrarily adjusted, and the convenience for the user can be further enhanced. In addition, if a mechanism for changing the distance of the light emitting unit (light source 5) from the focal point B of the parabola is provided, the focus can be adjusted. At this time, if the rotation shaft 8 is decentered with respect to the light emitting unit, the inclination adjustment and the focus adjustment of the optical axis can be performed simultaneously only by the rotation of the rotation shaft 8. 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 are fixed to arbitrary inclinations and positional relationships without providing a driving mechanism such as the rotating shaft 8. It is good also as composition which performs.

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

  FIG. 11 is a plan view showing the arrangement of the optical system according to the present embodiment. Inside the illumination head 4, three reflecting plates 6a to 6c are arranged alternately offset in the front-back direction. Sub light sources 5a to 5c constituting the light source 5 are arranged on the reflection plates 6a to 6c, respectively. FIG. 12 is a sectional view of the left and right optical systems, and FIG. 13 is a sectional view of the central optical system. Assuming that the inclination of the optical axes of the light sources 5a and 5c with respect to the vertical direction in the left and right optical systems is θ1 and that this inclination in the central optical system is θ2, θ2 is set to be larger than θ1. The other points are the same as those of the first embodiment, and the description is omitted here.

  FIG. 14 is a diagram showing the light intensity distribution of the irradiation area D before diffusion of the individual sub light sources 5a to 5c before diffusion, and FIG. 15 is a diagram of a composite light source before diffusion in which three sub light sources 5a to 5c are superimposed. FIG. 16 is a diagram showing the light intensity distribution of the irradiation region D, and FIG. 16 is a diagram showing the light intensity distribution of the irradiation region D after the diffusion. These figures show, as an example of an experiment, a distribution in a case where the diameter of the illumination head 4 is about 200 mm, the height of the stand is 300 mm, and a wide range and round light is emitted from a plane parallel to the installation surface. The irradiation area of the light formed by the left and right sub-light sources (FIGS. 14A and 14C) is longer in the front-rear direction (left-right direction in the figure) than that of the central light source (FIG. 14B). When the three lights are superimposed on each other, light having a more circular shape is formed (FIG. 15). As a result of diffusing the synthetic light having a circular shape with the diffusion plate 7 (FIG. 16), the irradiation area D is obtained. Can be made more circular and the illuminance can be maintained. In addition, the emitted lights from the three optical systems are combined, and the irradiation area D is formed in front of the area immediately below the illumination head 4.

  As described above, according to the present embodiment, by combining a plurality of optical systems, the irradiation area D formed on the irradiation surface is offset forward from immediately below the illumination head 4 as in the first embodiment. be able to.

(Third embodiment)
In the first and second embodiments described above, the example in which the irradiation area D is formed in front of immediately below the illumination head has been described. However, in the present embodiment, a plurality of optical systems (sub light sources) are combined. An example in which a large and clean substantially circular irradiation area D is formed directly below the illumination head 4 will be described.

  FIG. 17 is a plan view of the optical system according to the present embodiment. Inside the illumination head 4, four reflection plates 6a to 6d, which are obtained by cutting the reflection plate 6 having the above-described reflection characteristics, are arranged point-symmetrically, that is, arranged vertically and horizontally. A plurality of sub-light sources 6a to 6d constituting the light source 5 are arranged on the reflecting plates 6a to 6d at an angle. However, the relative inclination of the sub light sources 6a to 6d with respect to the reflection plates 6a to 6d is smaller than that in the first and second embodiments, and the reflected light from the respective reflection plates 5a to 5d is It is set so as not to be greatly dispersed. Further, as shown in FIG. 18, the above-described reflector 6 may be configured as a single ring-shaped reflector 6e.

  FIG. 19 is a diagram showing a light intensity distribution of the irradiation area D before diffusion by the plurality of sub light sources 5a to 5d, and FIG. 20 is a diagram showing a light intensity distribution after diffusion by the lens diffusion plate 7. Through the processing by the lens diffusion plate 7, the four light fields overlap, and the irradiation area D has a uniform light intensity over a wide and substantially circular shape.

  According to this embodiment, by combining a plurality of optical systems, it is possible to form an irradiation area D having a wide area, a substantially circular shape, and a uniform light intensity immediately below the illumination head 4.

  In the above-described first and second embodiments, the example in which the irradiation region D is formed so as to be offset forward from immediately below the illumination head 4 has been described, but the offset direction is limited to the forward direction. However, the present invention broadly encompasses a form in which it is offset in one direction with respect to immediately below the illumination head 4. In addition, the lighting device 1 is not limited to the stand type, and may include only the lighting head 4 including a clip type and a hanging type.

DESCRIPTION OF SYMBOLS 1 Illumination equipment 2 Installation stand 3 Arm 4 Illumination head 5, 5a-5d Light source 6, 6a-6e Reflector 7 Lens diffuser 8 Rotation axis

In order to solve such a problem, a first invention provides a lighting device including an installation table, a lighting head, and an arm. The arm connects the installation table and the lighting head. The illumination head has a first sub light source, a second sub light source, a first reflector, and a second reflector. The second sub light source is arranged to be offset ahead of the first sub light source. The first reflector 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 is formed on the irradiation surface with the illumination head facing directly below. Light reflected from the first sub light source is guided in a specific direction so that the irradiation area is offset forward with respect to immediately below the illumination head. The second reflector is arranged to be offset forward of the first reflector, has a curved surface shape that is asymmetric with respect to the optical axis of the light emitted from the second sub light source, and the illumination head is located directly below. The second irradiation region formed on the irradiation surface in a state where the second irradiation region is directed forward with respect to immediately below the illumination head, and overlaps at least a part of the first irradiation region. The reflected light that reflects the light emitted from the sub light source is guided in a specific direction.

A second invention provides a lighting device including at least a lighting head. The illumination head has a first sub light source, a second sub light source, a first reflector, and a second reflector. The second sub light source is arranged so as to be offset forward of the first sub light source. The first reflector 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 is formed on the irradiation surface with the illumination head facing directly below. Light reflected from the first sub light source is guided in a specific direction so that the irradiation area is offset forward with respect to immediately below the illumination head. The second reflector is arranged to be offset forward of the first reflector, has a curved surface shape that is asymmetric with respect to the optical axis of the light emitted from the second sub light source, and the illumination head is located directly below. The second irradiation region formed on the irradiation surface in a state where the second irradiation region is directed forward with respect to immediately below the illumination head, and overlaps at least a part of the first irradiation region. The reflected light that reflects the light emitted from the sub light source is guided in a specific direction.

Here, in the first or second aspect, it is preferable that the inclination of the optical axis of the second sub light source with respect to the vertical direction is larger than the inclination of the optical axis of the first sub light source with respect to the vertical direction. Further, one first sub light source may be arranged at the front center of the illumination head, and two second sub light sources may be arranged at the rear left and right of the illumination head. Further, a lens diffusion plate provided on the optical axis of the reflected light and diffusing the reflected light at a certain angle may be further provided. In this case, it is preferable that at least a part of the first irradiation area and the second irradiation area overlap each other when the lens diffusion plate is removed. In addition, the first reflector and the second reflector have reflection characteristics of the front side edge portion such that the ray angle of the reflected light with respect to the vertical direction gradually decreases toward the front side edge portion. Is preferred. Further, the first reflector and the second reflector have an asymmetric curved surface cross section in which a parabola is inclined with respect to the optical axis of light emitted from the first sub light source and the second sub light source. You may have.

According to the present invention, a reflection plate is provided for each sub light source , and the reflected light is guided in a specific direction by each reflection plate. By combining a plurality of optical systems in this way, it is possible to overlap at least a part of the irradiation area while offsetting the irradiation area formed on the irradiation surface with respect to the position directly below the illumination head .

In order to solve such a problem, a first invention provides a lighting device including an installation table, a lighting head, and an arm. The illumination head forms an irradiation area on the irradiation surface that is offset forward from immediately below the illumination head, with the lower surface being parallel to the irradiation surface. The arm connects the installation table and the lighting head. The illumination head has a first sub light source, a second sub light source, a first reflector, and a second reflector. The second sub light source is disposed so as to be offset backward from the first sub light source. The first reflector 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 is formed on the irradiation surface with the lower surface of the illumination head parallel to the irradiation surface. The reflected light, which reflects the light emitted from the first sub light source, is directed in a specific direction such that the first irradiation area to be set is offset forward with respect to immediately below the illumination head. The second reflector is arranged to be offset ahead of the first reflector, has a curved surface shape that is asymmetric with respect to the optical axis of light emitted from the second sub light source, and has a lower surface of the illumination head . Is parallel to the irradiation surface, the second irradiation region formed on the irradiation surface is offset forward with respect to immediately below the illumination head, and overlaps with at least a part of the first irradiation region. The reflected light reflected from the light emitted from the second sub light source is guided in a specific direction so as to spread in the front-back direction more than the first reflection region .

A second invention provides a lighting device including at least a lighting head. Lighting head comprises a first sub-light source, and a second sub-light source, a first reflector, have a second reflector, in parallel to the lower surface irradiated surface, just below the self Is formed on the irradiation surface, the irradiation region being offset backward with respect to. The second sub light source is arranged to be offset ahead of the first sub light source. The first reflector 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 is formed on the irradiation surface with the lower surface of the illumination head parallel to the irradiation surface. The reflected light, which reflects the light emitted from the first sub light source, is directed in a specific direction such that the first irradiation area to be set is offset forward with respect to immediately below the illumination head. The second reflector is arranged to be offset ahead of the first reflector, has a curved surface shape that is asymmetric with respect to the optical axis of light emitted from the second sub light source, and has a lower surface of the illumination head . Is parallel to the irradiation surface, the second irradiation region formed on the irradiation surface is offset forward with respect to immediately below the illumination head, and overlaps with at least a part of the first irradiation region. The reflected light reflected from the light emitted from the second sub light source is guided in a specific direction so as to spread in the front-back direction more than the first reflection region .

According to the present invention, a reflection plate is provided for each sub light source, and the reflected light is guided in a specific direction by each reflection 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 offsetting the irradiation area formed on the irradiation surface with respect to the position immediately below the illumination head. In addition, the second irradiation area is offset forward with respect to immediately below the illumination head, and extends in the front-rear direction beyond the first irradiation area while overlapping at least a part of the first irradiation area. Thus, when these irradiation areas are overlapped, light having a more circular shape can be formed.

Claims (7)

In lighting equipment,
At least have a lighting head,
The lighting head includes:
Light source,
It has a curved surface shape that is asymmetrical with respect to the optical axis of the light emitted from the light source, and an irradiation area formed on the irradiation surface in a state where the illumination head faces directly below, with respect to immediately below the illumination head. A reflector for guiding the reflected light, which reflects the emitted light, in a specific direction so as to be offset. In lighting equipment,
An installation table,
A lighting head,
An arm for connecting the installation table and the lighting head,
The lighting head includes:
Light source,
It has a curved surface shape that is asymmetrical with respect to the optical axis of the light emitted from the light source, and an irradiation area formed on the irradiation surface in a state where the illumination head faces directly below, with respect to immediately below the illumination head. A reflector for guiding the reflected light, which reflects the emitted light, in a specific direction so as to be offset.   The lighting device according to claim 1, wherein the reflection plate guides the reflected light forward to offset the irradiation area forward.   4. The reflection plate according to claim 3, wherein, as a reflection characteristic of a front edge portion, the reflection plate reflects the light so that a ray angle of the reflected light with respect to a vertical direction gradually decreases toward the front edge portion. 5. Lighting equipment.   4. The illumination head according to claim 3, wherein the reflection plate has, as the asymmetric curved surface shape, a cross-sectional shape in which a parabola is inclined with respect to an optical axis of light emitted from the light source. 5.   4. The apparatus according to claim 3, further comprising a lens diffusion plate provided on an optical axis of the reflected light and diffusing the reflected light at a certain angle so that the light intensity of the irradiation area becomes uniform. 5. Lighting equipment. The light source has a plurality of sub light sources,
The lighting device according to claim 3, wherein the reflector reflects the emitted light emitted from each of the plurality of sub light sources and guides the emitted light forward as the reflected light.

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