JP6917008B2 - Lighting device - Google Patents

Description

The present disclosure relates to a lighting device that illuminates an illuminated area.

A laser light source that emits coherent light generally has a higher emission intensity than an LED (Light Emitting Device), and since the light emitted from the laser light source is coherent, the light distribution can be finely controlled and the light is distant. It has the advantage of being able to deliver light to.

Patent Document 1 discloses a vehicle lamp that forms a predetermined light distribution pattern through a projection lens by two-dimensionally scanning a laser beam with an optical deflector.

Japanese Unexamined Patent Publication No. 2012-146621

In the case of Patent Document 1, the laser light from the excitation light source is condensed and then incident on the light deflector, and the light intensity per unit area of the laser light incident on the lens from the light deflector becomes very high. .. In Patent Document 1, the laser beam is scanned on the lens by an optical deflector, but since a strong laser beam is instantaneously incident at each position on the lens, consideration for the safety of the laser beam is sufficient. I can't say.

A lighting device using a laser beam can be used for various purposes, but when an attempt is made to increase the lighting intensity, the laser light source becomes large and the housing of the lighting device also becomes large. If such a lighting device is installed in a room, for example, the interior design of the room may be impaired. In the past, the housing of the lighting device was merely provided with an opening for emitting laser light, and there was no idea of using the housing of the lighting device itself for lighting or information display.

The present disclosure has been made in view of the above-mentioned problems, and provides a lighting device in which the housing itself can be used for lighting or information display purposes while considering the safety of coherent light.

In order to solve the above problems, according to the present disclosure, a light source that emits coherent light and a light source that emits coherent light are used.
A shaping optical system that collimates the coherent light emitted from the light source,
A diffractive optical element that diffracts coherent light collimated by the shaping optical system, and
Provided is an illuminating device including an opening for passing coherent light diffracted by the diffractive optical element, and an optical opening member for illuminating an illuminated area with coherent light passing through the opening.

The opening may have an opening shape related to the illumination shape of the illuminated area.

The opening may have an opening shape that represents information related to the information displayed in the illuminated area.

The opening may have an opening shape that is the same as or similar to the outer shape of the information displayed in the illuminated area.

The opening may have an opening shape different from the outer shape of the information displayed in the illuminated area.

The opening may have an opening shape that is uncorrelated with the illumination shape of the illuminated area.

Of the coherent light diffracted at each point of the diffractive optical element, the plurality of coherent lights that have passed through the opening may illuminate at least a part of the illuminated area where they differ.

Of the coherent lights diffracted at each point of the diffractive optical element, the plurality of coherent lights that have passed through the opening may illuminate the entire area of the illuminated area.

Each of the optical aperture members has a plurality of apertures through which coherent light diffracted by the diffractive optical element is passed.
The plurality of coherent lights that have passed through the plurality of openings may illuminate at least a part of the illuminated area in an overlapping manner.

Each of the optical aperture members has a plurality of apertures through which coherent light diffracted by the diffractive optical element is passed.
The plurality of coherent lights that have passed through the plurality of openings may illuminate a plurality of areas within the illuminated area where at least a part differs.

The opening has an opening shape that represents at least one of letters, symbols, numbers, designs and patterns.
The illuminated area may have an illuminated shape that represents at least one of letters, symbols, numbers, designs and patterns.

The optical aperture member may be provided in at least a part of a housing that houses the light source, the shaping optical system, and the diffractive optical element.

According to the present disclosure, it is possible to provide a lighting device that can use the housing itself for lighting or information display purposes while considering the safety of coherent light.

The figure which shows the schematic structure of the lighting apparatus by 1st Embodiment. The perspective view which shows the appearance of a lighting apparatus. A plan view of the illuminated area observed from the normal direction of the illuminated area. The figure observed from the normal direction of the surface extending in the normal direction and the longitudinal direction of an illuminated area. The figure which shows the example which illuminates one star-shaped illuminated area. The figure which shows the example which illuminates the illuminated area of each separate star shape. The figure which shows an example which makes an observer recognize an opening of an optical opening member as a design or a pattern. The figure which shows the schematic structure of the lighting apparatus for color lighting. The figure which shows the example which illuminates the line-shaped illuminated area with the illuminating device which has three openings. The figure which shows the lighting apparatus which arranged 3 openings in the horizontal direction. The figure which shows the opening different from FIG. The figure which shows the opening different from FIG. 7A. The figure which shows the opening which is different from FIG. 7A and FIG. 7B. The figure which shows the opening different from FIG. 7A to FIG. 7C. The figure which shows the example which displays the character information. The figure which shows the example which displays the character information different from FIG. 8A. The figure which shows the example which shows the design information about an emergency exit. The figure which shows an example which one of the illumination shape of an illuminated area and the opening shape of an opening represents character information, and the other represents design information.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

Furthermore, as used in the present specification, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle that specify the shape and geometric conditions and their degrees are strictly used. Without being bound by meaning, we will interpret it including the range in which similar functions can be expected.

(First Embodiment)
FIG. 1A is a diagram showing a schematic configuration of the lighting device 1 according to the first embodiment, and FIG. 1B is a perspective view showing the appearance of the lighting device 1. The lighting device 1 according to the present embodiment is used, for example, as a part of a vehicle headlight. However, the lighting device 1 according to the present embodiment can also be applied as various lighting lamps such as a tail light of a vehicle and a searchlight. Further, the vehicle is intended to include not only vehicles such as automobiles and bicycles, but also various vehicles equipped with a lighting device 1 such as ships, airplanes, and trains. Hereinafter, as an example, an example in which the lighting device 1 according to the present embodiment is applied to a part of the headlights of a vehicle will be described.

As shown in FIG. 1A, the lighting device 1 according to the present embodiment includes a light source 2, a shaping optical system 3, a diffractive optical element 4, and a light aperture member 5. Each part in the lighting device 1 is housed inside a cube-shaped housing 1a, for example, as shown in FIG. 1B.

The light source 2 is typically a laser light source 2 that emits coherent light, or laser light. The laser light source 2 has various types such as a semiconductor laser, and any type of laser light source 2 may be used. Here, the coherent light is light having the same phase and frequency.

The shaping optical system 3 collimates the coherent light emitted from the light source 2. Collimating is to widen and parallelize the beam diameter of the coherent light emitted from the light source 2. More specifically, the collimating optical system 3 has a first lens 3a that widens the beam diameter of the coherent light emitted from the light source 2, and a second lens 3b that collimates the light that has passed through the first lens 3a. ..

The diffractive optical element 4 diffracts the coherent light collimated by the shaping optical system 3. The diffractive optical element 4 is typically a hologram element. As will be described later, by using the hologram element as the diffraction optical element 4, it becomes easy to design the diffraction characteristics, and the hologram element can be designed to illuminate the entire area of the illuminated area 6 having a predetermined position, size and shape. It can be done relatively easily.

The diffractive optical element 4 may be divided into a plurality of element diffractive portions. In this case, each element diffracting unit may illuminate the entire area of the same illuminated area 6, or may illuminate at least a partially different partial area within the illuminated area 6.

By designing the diffraction characteristics of the diffractive optical element 4 so that each element diffractive part of the diffractive optical element 4 correctly illuminates each illumination range in the illuminated area 6 corresponding to each element diffractive part, the illuminated area. Blurring at 6 can be suppressed.

In FIGS. 2 and 3, the diffractive optical element 4 is divided into a plurality of element diffracting units 45, and each element is such that the coherent light diffracted by each element diffracting unit 45 illuminates the entire area of the illuminated region 6. An example of designing the diffraction characteristics of the diffractive part is shown. 2 and 3 show an example in which a plurality of element diffractive portions 45 in the diffractive optical element 4 are arranged in a grid pattern in the first arrangement direction da and the second arrangement direction db.
As shown in FIG. 2, assuming that the diffracted light from the element diffracting unit 45 arranged so as to be shifted in the second arrangement direction db is the same as each other without particularly adjusting the diffraction characteristics of the element diffracting unit 45, the element concerned. It is displaced in the second arrangement direction db, which is the arrangement direction of the diffraction unit 45, and is irradiated on the surface on which the illuminated region 6 is located. 2 and 3 show an example in which each element diffraction unit 45 illuminates the entire area of the rectangular illuminated area 6.

As shown in FIG. 2, the irradiation width iwa along the width direction dl orthogonal to the longitudinal direction dl of the diffracted light from one element diffracting portion 45s incident on an arbitrary position along the longitudinal direction dl of the illuminated region 6 Is the same as the irradiation width iw along the width direction dw of the diffracted light from the other element diffracting unit 45k incident on the arbitrary position along the longitudinal direction dl of the illuminated area 6. The diffraction characteristics of the element diffraction units 45 arranged in the second arrangement direction db are adjusted. The adjustment of the diffraction characteristic is performed over the entire area along the longitudinal direction of the illuminated area 6. FIG. 2 is a plan view of the illuminated area 6 observed from the normal direction of the illuminated area 6, and FIG. 3 is the normal direction of the surface extending in the normal direction nd and the longitudinal direction dl of the illuminated area 6. It is a figure observed from.

In the example shown in FIG. 2, the diffraction characteristic of the light directed to the position in the illuminated region 6 separated by the distance R along the longitudinal direction dl from each element diffraction portion 45 is determined according to the width of the illuminated region 6. adjust. Diffraction characteristics can also be adjusted using the diffusion angle distribution in angular space. First, the diffraction characteristics of the reference element diffraction unit 45s are adjusted. For example, in the example shown in FIG. 2, the diffusion angle characteristic of the reference element diffractive portion 45s heading to a position separated by a distance R along the longitudinal direction dl is specified by the coordinate system shown in FIG. 2 as follows. Will be done.
tan (θ 1 ₊ ) = x ⁺ / R
tan (θ _1- ) = x ⁻ / R

Next, the diffusion angle characteristics of the other element diffraction unit 45k are deviated from the diffusion angle characteristics of the reference element diffraction unit 45s along the second arrangement direction db from the reference element diffraction unit 45s to the element diffraction unit 45k. It is determined in consideration of the amount a. Specifically, it is determined as follows.
tan (θ ₂₊ ) = (x ⁺ + a) / R
tan (θ _2- ) = (x ⁻ −a) / R

The diffusion angle characteristic of the reference element diffraction unit 45s is performed over the entire area along the longitudinal direction dl of the illuminated region 6. Similarly, the diffusion angle characteristic of the other element diffraction unit 45k is also performed over the entire area along the longitudinal direction dl of the illuminated region 6.

Next, assuming that the diffracted light from the element diffracting unit 45 arranged so as to be displaced in the first arrangement direction da is the same as each other without particularly adjusting the diffraction characteristics of the element diffracting unit 45, it is viewed from the element diffracting unit 45. Displaced in both the frontal direction and the direction perpendicular to the frontal direction, that is, in the illustrated example, both the longitudinal direction dl and the width direction dw of the illuminated area 6 on the surface pl where the illuminated area 6 is located. It is displaced to and irradiated. Therefore, in the same manner as the adjustment of the diffraction characteristics of the element diffraction units 45 arranged so as to be offset in the second arrangement direction db, as a specific example, the adjustment of the diffraction characteristics in the angular space described with reference to FIG. 2 is performed. The irradiation width iw along the width direction dl orthogonal to the longitudinal direction dl of the diffracted light from one element diffracting portion 45s incident at an arbitrary position along the longitudinal direction dl of the illuminated region 6 is the illuminated region. The first arrangement direction da so as to be the same as the irradiation width iw along the width direction dw of the diffracted light from the other element diffracting portions 45s, 45k incident on the arbitrary position along the longitudinal direction dl of 6. The diffraction characteristics of the element diffraction units 45 arranged in the above are adjusted.

Further, as shown in FIG. 3, the irradiation length il along the longitudinal direction dl of the diffracted light from one element diffracting portion 45s incident on an arbitrary position along the width direction dw of the illuminated area 6 is covered. The first element so as to be the same as the irradiation length il along the longitudinal direction dl of the diffracted light from the other element diffracting portion 45k incident on the arbitrary position along the width direction dw of the illumination region 6. The diffraction characteristics of the element diffraction units 45 arranged in the arrangement direction da are adjusted.

In the example shown in FIG. 3, the diffraction characteristic of the light directed from the element diffraction unit 45 arranged in the first arrangement direction da to an arbitrary position in the width direction dw is adjusted according to the length of the illuminated region 6. .. Diffraction characteristics can also be adjusted using the diffusion angle distribution in angular space. First, the diffraction characteristics of the reference element diffraction unit 45s are adjusted. For example, in the example shown in FIG. 3, the diffusion angle characteristic of the reference element diffraction unit 45s toward an arbitrary position in the width direction dw is specified by the coordinate system shown in FIG. 3 as follows.
tan (θ ₃₊ ) = h / y
tan (θ _3- ) = h / (y + il)

In the formula, "h" is the distance from the irradiation surface pl on which the illuminated region 6 is formed to the reference element diffraction section 45 along the first arrangement direction da, that is, the position where the reference element diffraction section 45 is arranged. Corresponds to the height of.

Next, the diffusion angle characteristics of the other element diffraction unit 45k included in the first hologram element 40a which is the same as the reference element diffraction unit 45s, the diffusion angle characteristics of the reference element diffraction unit 45s, and the reference element diffraction unit 45s It is determined in consideration of the deviation amount b along the first arrangement direction da from the element diffraction unit 45k to the element diffraction unit 45k. Specifically, it is determined as follows.
tan (θ ₄₊ ) = (h−b) / y
tan (θ _4- ) = (h−b) / (y + il)

Further, the diffusion characteristics of the other element diffraction unit 45k included in the hologram element 40 different from the reference element diffraction unit 45s can be similarly determined. That is, the diffusion angle characteristic of the other element diffraction unit 45k included in the third hologram element 40c is the diffusion angle characteristic of the reference element diffraction unit 45s, and the third element diffraction unit 45s to the element diffraction unit 45k. It can be determined in consideration of the deviation amount c along the arrangement direction da. Specifically, it is determined as follows.
tan (θ ₅₊ ) = (h−c) / y
tan (θ _5- ) = (h-c) / (y + il)

The diffusion angle characteristic of the reference element diffraction unit 45s in the longitudinal direction dl is performed over the entire area along the width direction dw of the illuminated region 6. Similarly, the diffusion angle characteristic of the other element diffraction unit 45k is also performed over the entire area along the width direction dw of the illuminated region 6.

The optical opening member 5 shown in FIG. 1 has an opening 5a through which the coherent light diffracted by the diffractive optical element 4 passes, and illuminates the illuminated area 6 with the coherent light passing through the opening 5a. The shape, size, and number of openings 5a are arbitrary. For example, the opening 5a has an opening shape related to the lighting shape of the illuminated area 6. The aperture shape related to the illumination shape means an opening shape that is the same as, similar to, or related to the illumination shape of the illuminated area 6.

Of the coherent lights diffracted at each point of the diffractive optical element 4, the plurality of coherent lights that have passed through the opening 5a may illuminate at least a part of the illuminated area 6 that differs from each other. Alternatively, among the coherent lights diffracted at each point of the diffractive optical element 4, the plurality of coherent lights that have passed through the opening 5a may illuminate the entire area of the illuminated area 6.

As a specific example, when the illumination shape of the illuminated area 6 is at least one shape of a specific character, symbol, number, design, and pattern, the opening shape of the opening 5a is the same as or similar to the illumination shape. It may be. For example, FIGS. 1A and 1B show an example in which the opening shape of the opening 5a of the light opening member 5 is star-shaped, and the illumination shape of the illuminated area 6 is also star-shaped.

The number of openings 5a of the optical opening member 5 may be one or a plurality. The number of diffractive optical elements 4 corresponding to the number of openings 5a is provided. More specifically, the coherent light diffracted by each diffracting optical element 4 may pass through the corresponding opening 5a, or the coherent light diffracted by each diffracting optical element 4 may pass through the plurality of openings. It may pass through 5a. Alternatively, the coherent light diffracted by the plurality of diffracting optical elements 4 may pass through one opening 5a.

The illuminated area 6 is provided with a number of illumination ranges corresponding to the number of openings 5a of the light opening member 5, but the number of openings 5a and the number of illumination ranges do not necessarily have to match. For example, FIG. 4A shows an example in which one star-shaped illuminated area 6 is illuminated by a plurality of coherent lights, each of which has passed through a plurality of star-shaped openings 5a. In this case, the coherent light passing through each opening 5a may illuminate the entire area of the star-shaped illuminated area 6, or the coherent light passing through each opening 5a may illuminate the entire area of the illuminated area 6. The lighting may be divided into parts. On the other hand, FIG. 4B shows an example in which a plurality of coherent lights, each of which has passed through a plurality of star-shaped openings 5a, illuminate different star-shaped illumination ranges. In the example of FIG. 4B, the coherent light passing through each opening 5a illuminates a separate star-shaped illumination range within the illuminated area 6.

Further, the opening 5a may have an opening shape that represents information related to the information displayed in the illuminated area 6. The information displayed in the illuminated area 6 is information such as characters, symbols, and numbers displayed by using the illumination light by the coherent light. The related information may be information consisting of the same characters or the like, information such as synonyms, related words, or other languages, or information in which the typeface, size, display color, and decoration of the characters or the like are changed.

The opening 5a in the light opening member 5 is a region through which coherent light passes, and when an observer on the illuminated area 6 side directs his / her line of sight toward the light opening member 5, the opening 5a is visually recognized brightly. That is, the observer can clearly recognize the region of the opening 5a and the other regions of the optical aperture member 5 by the difference in brightness. Therefore, by making the shape and size of the opening 5a in the light opening member 5 characteristic, it is possible to transmit some information to the observer or to recognize it as a part of the design.

Even if the observer directs his / her line of sight to the opening 5a of the light opening member 5, the diffused light from the diffractive optical element 4 is incident on the opening 5a, so that the light is strong enough to hurt the observer's eyes. It does not enter and there are no safety issues. In order to further improve safety, coherent light from a plurality of points of the diffractive optical element 4 is incident on the opening 5a so that strong light from one direction is not incident on the opening 5a. Is desirable. Since such improvement in safety depends on the diffraction characteristics of the diffraction optical element 4, it is desirable to design the diffraction characteristics of the diffraction optical element 4 in consideration of safety.

FIG. 5 is a diagram showing an example in which the observer recognizes the opening 5a in the light opening member 5 as a design or a pattern. The light opening member 5 of FIG. 5 imitates the outer shape of a pumpkin, and openings 5a are provided at positions of the eyes and mouth of the pumpkin. The coherent light that has passed through these openings 5a illuminates the illuminated area 6 with a pumpkin pattern. The observer can visually recognize the pumpkin pattern by the illumination shape of the illuminated area 6, and can visually recognize another pumpkin pattern through the opening 5a of the light opening member 5 by directing the line of sight to the lighting device 1. As described above, according to the example of FIG. 5, two kinds of unified patterns can be provided to the observer by the illumination shape of the illuminated area 6 and the opening shape of the opening 5a of the light opening member 5, for example, Halloween. It is possible to entertain the observer during the seasons.

In this way, by replacing the diffractive optical element 4 and the light aperture member 5 according to the season, the event, etc., and changing the aperture shape of the light aperture member 5 and the illumination shape of the illuminated area 6, various types of illumination can be performed. It is possible to realize the lighting device 1 capable of displaying information.

As shown in FIG. 1B, the optical aperture member 5 is provided in at least a part of the housing 1a that houses the light source 2, the shaping optical system 3, and the diffractive optical element 4. Actually, it is provided on the surface side of the housing 1a facing the exit surface of the diffractive optical element 4. For example, if a rectangular housing 1a having no design is arranged in a room having excellent design, the interior decoration may be impaired. However, in the case of the present embodiment, the housing 1a of the lighting device 1 itself has an opening. Since the shape of 5a exerts its design, it can be a part of interior decoration. Further, in the present embodiment, the housing 1a itself of the lighting device 1 can be used for lighting and information display. Thereby, the utility value of the lighting device 1 can be further improved.

In FIG. 1A, an example of illuminating the illuminated area 6 with a monochromatic light source 2 is shown. However, in order to illuminate the illuminated area 6 with color, the illuminated area 2 is used with light sources 2 having three or more wavelength ranges. It is necessary to illuminate 6. FIG. 6 is a diagram showing a schematic configuration of a lighting device 1 for color lighting. The lighting device 1 of FIG. 6 includes a plurality of light sources 2, a plurality of shaping optical systems 3, a plurality of diffractive optical elements 4, and a plurality of light aperture members 5.

The plurality of light sources 2 emit coherent light having different wavelength bands. The coherent light in different wavelength ranges is, for example, coherent light in a total of three wavelength ranges of red, green, and blue. Of course, the light source 2 may emit coherent light of a color other than red, green, and blue. Further, a plurality of light sources 2 having the same wavelength range may be provided to improve the illumination intensity of the illuminated area 6.

The shaping optical system 3, the diffractive optical element 4, and the optical aperture member 5 of FIG. 6 are provided so as to correspond to each of the plurality of light sources 2. That is, the coherent light in each wavelength range emitted from the plurality of light sources 2 is collimated by the corresponding shaping optical system 3, then incident on the corresponding diffractive optical element 4 and diffused, and the aperture of the optical aperture member 5 is opened. It passes through the part 5a and illuminates the illuminated area 6.

In the example of FIG. 6, coherent light in each wavelength range is emitted from separate openings 5a to illuminate the illuminated area 6, but coherent light in each wavelength range is emitted from the same opening 5a. The illuminated area 6 may be illuminated. Therefore, when performing color illumination, it is not an essential condition to provide a plurality of light opening members 5.

FIG. 7 is a diagram showing an example of illuminating a line-shaped illuminated area 6 with an illuminating device 1 having three openings 5a. The line-shaped illuminated area 6 is illuminated, for example, along the traveling direction of the vehicle. In the example of FIG. 7, an example in which the shape of the opening 5a is rectangular is shown, but the shape of the opening 5a is arbitrary. For example, coherent light in different wavelength ranges is emitted from each opening 5a in FIG. 7 to illuminate the illuminated region 6. Coherent light in the same wavelength range may be emitted from two or more openings 5a.

Further, in the example of FIG. 7, three openings 5a are arranged in the vertical direction, but the arrangement direction of the openings 5a is also arbitrary. For example, FIG. 8 shows a lighting device 1 in which three openings 5a are arranged in the horizontal direction. The number and shape of the openings 5a are arbitrary, and may be elliptical as shown in FIG. 9A, or rectangular openings 5a may be arranged in a grid pattern as shown in FIG. 9B. Further, the polygonal openings 5a may be arranged in a honeycomb shape as shown in FIG. 9C, or the circular openings 5a may be arranged in a staggered shape as shown in FIG. 9D.

In FIGS. 7, 8 and 9A to 9D, the arrangement of the openings 5a is not particularly designed, but a plurality of openings 5a may be arranged in consideration of the design and the pattern. These openings 5a are visually recognized dark when the light source 2 is not emitting coherent light, and are visually recognized bright when the light source 2 is emitting coherent light. The shape and arrangement of the opening 5a can be made conspicuous even by such a difference in brightness, and the opening 5a can be used for the purpose of lighting and information display.

As described above, the lighting device 1 according to the present embodiment can be used for the purpose of displaying some information. FIG. 10A shows an example in which the character information "Haina" is displayed in the illuminated area 6 and the same character information can be recognized by the opening shape of the opening 5a. The illumination shape of the illuminated area 6 and the opening shape of the opening 5a do not necessarily have to be the same, and an opening 5a having an opening shape related to the illumination shape of the illuminated area 6 may be provided. For example, one of the illumination shape of the illuminated area 6 and the opening shape of the opening 5a contains the character information of the first language (for example, Japanese), and the other contains the character information of the second language (for example, English). You may be.

FIG. 10B is a diagram showing an example of information display for the purpose of guidance display. FIG. 10B shows an example in which the character information “1F” indicating that the floor is on the first floor is represented by the illumination shape of the illuminated area 6 and the opening shape of the opening 5a.

According to FIGS. 10A and 10B, since the opening 5a provided in the housing 1a of the lighting device 1 is used for displaying information, even a person who does not notice the lighting or information display in the illuminated area 6 can open the opening. Attention can be drawn by characters or the like represented by the opening shape of the portion 5a.

FIG. 11A shows an example in which the illumination shape of the illuminated area 6 and the opening shape of the opening 5a represent design information regarding the emergency exit. FIG. 11A shows an example in which the illumination shape of the illuminated area 6 and the opening shape of the opening 5a both represent the same design information, but the design information of both may be different from each other.

FIG. 11B shows an example in which one of the illumination shape of the illuminated area 6 and the opening shape of the opening 5a represents character information, and the other represents design information. FIG. 11B shows an example in which the illumination shape of the illuminated area 6 represents the emergency exit and the opening shape of the opening 5a represents the character information of the “emergency exit”. Information may be represented, and the opening shape of the opening 5a may represent design information.

As described above, in the present embodiment, by characterizing the opening shape of the opening 5a through which the coherent light diffracted by the diffractive optical element 4 is passed, both the illumination shape of the illuminated area 6 and the opening shape of the opening 5a are characterized. It is possible to improve the design, display some information, call attention, and advertise. Therefore, the line of sight of the observer can be directed not only to the illuminated area 6 side but also to the lighting device 1 side, the housing 1a of the lighting device 1 itself can be used for lighting and information display, and the lighting device 1 can be used. You can increase the value.

The aspects of the present disclosure are not limited to the individual embodiments described above, but also include various modifications that can be conceived by those skilled in the art, and the effects of the present disclosure are not limited to the contents described above. That is, various additions, changes and partial deletions are possible without departing from the conceptual idea and purpose of the present disclosure derived from the contents defined in the claims and their equivalents.

1 Lighting device, 2 Light source, 3 Orthopedic optical system, 3a 1st lens, 3b 2nd lens, 4 Diffraction optical element, 5 Light aperture member, 6 Illuminated area

Claims (9)

A light source that emits coherent light and
A shaping optical system that collimates the coherent light emitted from the light source,
A diffractive optical element that diffracts coherent light collimated by the shaping optical system, and
Has an opening for passing the coherent light diffracted by the diffractive optical element, e Bei and a light opening member for illuminating a target area at the coherent light that has passed through the opening,
The opening is a lighting device having an opening shape that represents information related to information displayed in the illuminated area as an opening shape related to the illumination shape of the illuminated area. The opening, said has an outer shape identical or similar to the shape of the opening of the information displayed in the illuminated area, the lighting device according to claim 1. The opening has a different aperture shape and the outer shape of the information displayed in the illuminated area, the lighting device according to claim 1. Of the coherent lights diffracted at each point of the diffractive optical element, the plurality of coherent lights that have passed through the opening illuminate at least a part of the illuminated area where they differ. The lighting device according to any one of 3. According to any one of claims 1 to 3 , among the coherent lights diffracted at each point of the diffractive optical element, the plurality of coherent lights that have passed through the opening illuminate the entire area to be illuminated. The luminaire described. Each of the optical aperture members has a plurality of apertures through which coherent light diffracted by the diffractive optical element is passed.
The lighting device according to any one of claims 1 to 5 , wherein the plurality of coherent lights that have passed through the plurality of openings illuminate at least a part of the illuminated area in an overlapping manner. Each of the optical aperture members has a plurality of apertures through which coherent light diffracted by the diffractive optical element is passed.
The lighting device according to any one of claims 1 to 4 , wherein the plurality of coherent lights that have passed through the plurality of openings illuminate a plurality of ranges within the illuminated area where at least a part of the light is different. The opening has an opening shape that represents at least one of letters, symbols, numbers, designs and patterns.
The lighting device according to any one of claims 1 to 7 , wherein the illuminated area has a lighting shape representing at least one of a character, a symbol, a number, a design and a pattern. The lighting device according to any one of claims 1 to 8 , wherein the light aperture member is provided in at least a part of a housing for accommodating the light source, the shaping optical system, and the diffractive optical element.

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