JP2022184347A - Illumination device - Google Patents

Abstract

To provide an illumination device capable of stably illuminating a region to be illuminated in a predetermined shape.SOLUTION: A illumination device 10 has a light source 20, a shaping optical system 30, a light diffusion element 40, and a casing 50. The light source 20 emits coherent light. The shaping optical system 30 shapes the coherent light emitted from the light source 20. The light diffusion element 40 diffuses the coherent light shaped by the shaping optical system 30. The casing 50 houses the light source 20, the shaping optical system 30, and the light diffusion element 40. The light source 20, the shaping optical system 30, and the light diffusion element 40 are fixed to the casing 50 in a non-removable manner.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to lighting devices.

For example, as disclosed in Patent Document 1, it has a light source that emits coherent light and a diffractive optical element that diffracts the coherent light from the light source, and the illuminated object has a shape corresponding to the diffraction pattern of the diffractive optical element. Lighting devices for illuminating an area are known. In the illumination device of Patent Document 1, the diffractive optical element is rotatably supported. Such an illuminating device can adjust the orientation of the illuminated area by rotating the diffractive optical element as the orientation of the illuminating device with respect to the surface to be illuminated with light from the illuminating device changes.

Japanese Patent No. 6807058

Here, there is a demand for an illumination device that stably illuminates an area to be illuminated in a predetermined shape. However, in the illumination device in which the diffractive optical element is movable with respect to the light source, there is a possibility that the relative positions of the light source and the diffractive optical element may change unintentionally due to impact, vibration, or the like transmitted to the illumination device. If the relative positions change, it may not be possible to illuminate the area to be illuminated in a predetermined shape.

An object of the present disclosure is to provide a lighting device that can stably illuminate an area to be illuminated in a predetermined shape.

A lighting device according to an embodiment of the present disclosure includes:
a light source that emits coherent light;
a shaping optical system that shapes coherent light emitted from the light source;
a light diffusion element that diffuses the coherent light shaped by the shaping optical system;
a casing that houses the light source, the shaping optical system, and the light diffusion element;
The light source, the shaping optical system, and the light diffusing element are non-removably fixed to the casing.

In a lighting device according to an embodiment of the present disclosure,
The light diffusing element may be a diffractive optical element.

In a lighting device according to an embodiment of the present disclosure,
The light diffusing element may be a microlens array.

The lighting device according to an embodiment of the present disclosure may further include a battery for supplying power to the light source,
The battery may be housed in the casing and permanently fixed to the casing.

A lighting device according to an embodiment of the present disclosure includes:
a secondary battery that supplies power to the light source;
It may further have an external connection terminal that is detachably connected to an external power supply device,
The secondary battery may be charged through the external connection terminal.

The lighting device according to an embodiment of the present disclosure may further have an external connection terminal detachably connected to an external power supply device,
Power may be supplied from the power supply device to the light source via the external connection terminal.

In a lighting device according to an embodiment of the present disclosure,
The casing may include a plurality of casing parts defining a space for housing the light source, the shaping optical system, and the light diffusion element,
The plurality of casing parts may be inseparably connected to each other.

In a lighting device according to an embodiment of the present disclosure,
The plurality of casing components may be connected via a sealing material.

In a lighting device according to an embodiment of the present disclosure,
The light source may emit visible light.

The lighting device according to an embodiment of the present disclosure may further have a circuit board electrically connected to the light source,
The casing may house the circuit board.

In a lighting device according to an embodiment of the present disclosure,
The light diffusion element may have an incident surface on which light from the shaping optical system is incident,
Concavities and convexities may be formed on the incident surface for diffusing the light from the shaping optical system.

In a lighting device according to an embodiment of the present disclosure,
The light diffusion element may have an exit surface from which light incident on the entrance surface exits,
The unevenness may be formed over an entire region of the incident surface that overlaps at least the exit surface when the light diffusing element is viewed in a direction from the exit surface toward the incident surface.

A lighting device according to an embodiment of the present disclosure may emit only the light diffused by the light diffusing element.

In a lighting device according to an embodiment of the present disclosure,
An outer peripheral surface of the casing may be provided with anti-rolling means.

According to the present disclosure, it is possible to provide a lighting device that can stably illuminate an area to be illuminated in a predetermined shape.

FIG. 1 is a diagram for explaining an embodiment, and is a perspective view of a lighting device as seen from the side of a light diffusing element. FIG. 2 is a perspective view of the lighting device in FIG. 1 as seen from the external connection terminal side. 3 is a cross-sectional view of the illumination device of FIG. 1. FIG. FIG. 4 is a diagram for explaining a modification of the lighting device of FIG. FIG. 5 is a diagram illustrating another modification of the lighting device of FIG. 6 is a side view showing a light source, a circuit board, a battery, and an external connection terminal of the lighting device of FIG. 1. FIG. 7 is an exploded perspective view showing components arranged inside an outer casing of the lighting device of FIG. 1. FIG. FIG. 8 is an exploded perspective view of the outer casing. FIG. 9 is a diagram explaining still another modification of the lighting device of FIG. FIG. 10 is a diagram explaining still another modification of the lighting device of FIG. FIG. 11 is a diagram explaining still another modification of the lighting device of FIG. FIG. 12 is a diagram illustrating still another modification of the lighting device of FIG.

An embodiment of the present disclosure will be described below with reference to the drawings. In the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale and the ratio of vertical and horizontal dimensions are changed and exaggerated from those of the real thing.

In order to clarify the directional relationship among the drawings, in some drawings, the first direction D1, the second direction D2 and the third direction D3 are indicated by arrows as common directions among the drawings. The tip side of the arrow is one side of each direction D1, D2, D3. An arrow pointing forward from the plane of the drawing along a direction perpendicular to the plane of the drawing is indicated by a dot in a circle, as shown in FIG. Also, an arrow directed to the depth of the paper surface along the direction perpendicular to the paper surface of the drawing is indicated by a symbol with an x in a circle, as shown in FIG. 10, for example.

As used herein, terms specifying shapes and geometric conditions as well as degrees thereof, such as "parallel", "perpendicular", "identical", length and angle values, etc., are strictly It is interpreted to include the extent to which similar functions can be expected without limitation.

Illumination device 10 in the present embodiment illuminates illuminated region 90 on illuminated surface 95 . The illumination device 10 is devised to stably illuminate the illuminated region 90 in a predetermined shape.

An embodiment will be described below with reference to specific examples shown in the drawings.

In the illustrated example, lighting device 10 is a portable lighting device. That is, the lighting device 10 can be carried by the user without using special means. Therefore, the lighting device 10 can be carried by the user to perform lighting at a desired location. Particularly in the illustrated example, the lighting device 10 is sufficiently small and light and configured as a portable lighting device. Since the illumination device 10 is sufficiently small and lightweight and portable, it is possible to appropriately change the illuminated surface 95 to be illuminated with the coherent light depending on the situation.

The lighting device 10 irradiates the surface 95 to be irradiated with coherent light. According to such a lighting device 10 , a large area to be illuminated 90 can be illuminated on the surface 95 to be illuminated.

In the illustrated example, the illumination device 10 illuminates the illuminated region 90 in the shape of an arrow, but the illumination device 10 is not limited to this. The illumination device 10 may illuminate the illuminated area 90 in a shape representing any one or more of characters, patterns, color patterns, symbols, marks, illustrations, characters, and pictograms. The illuminated region 90 may have a shape extending along a straight line.

As shown in FIG. 3, the illumination device 10 has a light source 20, a shaping optical system 30, a light diffusing element 40 and a casing 50. As shown in FIG. In the illustrated example, the lighting device 10 further comprises a battery 70, a circuit board 72, a switch 74 and an operating lamp 76. FIG.

The light source 20 is not particularly limited as long as it is a component that emits coherent light. The light source 20 emits coherent light of uniform wavelength and phase. Since the light emitting point of the light source 20 is very small, the emitted coherent light can have high rectilinearity. Therefore, the light source 20 is suitable for the lighting device 10 that illuminates a long distance. Various types of light sources can be used as the light source 20 . As the light source 20, a laser light source that oscillates laser light may be used. As a laser light source, a semiconductor laser light source can be exemplified. In the example shown in FIG. 3, the light source 20 emits visible light. Also, in the example shown in FIG. 3, light source 20 comprises a single coherent light source. Therefore, in the example shown in FIG. 3 , the illuminated area 90 is illuminated with coherent light of a color corresponding to the wavelength range of the coherent light emitted from the light source 20 .

In the illustrated example, the light source 20 has a light emitting portion 21 including a light emitting element and lead terminals 22 electrically connecting the light emitting portion 21 and the circuit board 72 . The light emitting portion 21 of the light source 20 and the circuit board 72 may be electrically connected via a socket. Light source 20 is electrically connected to battery 70 via circuit board 72 and switch 74 .

In the illustrated illumination device 10, the light source 20 emits coherent light at a power below the maximum rated power, preferably at half the maximum rated power.

The shaping optical system 30 shapes the light emitted from the light source 20 . For example, the shaping optical system 30 shapes the shape of the coherent light in a cross section perpendicular to the optical axis or the three-dimensional shape of the coherent light. The shaping optical system 30 may expand the cross-sectional area of the coherent light in a cross section perpendicular to the optical axis of the coherent light.

In the example shown in FIG. 3, the shaping optical system 30 shapes the light emitted from the light source 20 into widened parallel light. That is, the shaping optical system 30 functions as a collimating optical system. In the example shown in FIG. 3, the shaping optical system 30 has a first lens 31, a second lens 32 and a third lens 33 arranged along the optical path. The first lens 31, the second lens 32, and the third lens 33 shape divergent light emitted from the light source 20 into parallel light. The entire lens group functions as a collimator lens. By adjusting each entrance surface and exit surface of the lens to have positive or negative refractive power, the effect of aberration can be effectively suppressed. As shown in FIG. 4, the shaping optical system 30 may consist of a first lens 31 and a second lens 32 . In this case, the first lens 31 shapes the light emitted from the light source 20 into divergent light, and the second lens 32 shapes the divergent light generated by the first lens 31 into parallel light. In the example shown in FIG. 4 as well, the first lens 31 and the second lens 32 can function as a collimating lens that suppresses aberration.

The light diffusing element 40 diffuses the light emitted from the shaping optical system 30 and directs it toward the illuminated surface 95 . The light diffusing element 40 has an incident surface 41 on which the light from the shaping optical system 30 is incident, and an output surface 42 from which the light incident on the incident surface 41 is emitted. The incident surface 41 is formed with fine unevenness for diffusing the light from the shaping optical system 30 . The incident surface 41 is a surface facing the inside of the casing 50 . Therefore, by forming the unevenness on the incident surface 41, the possibility that the light diffusion element 40 is damaged and the unevenness is lost is suppressed. As a result, the light from the shaping optical system 30 can be diffused by the light diffusion element 40 with high reliability.

The unevenness of the light diffusing element 40 is formed over at least the entire region of the incident surface 41 that overlaps with the emitting surface 42 when the light diffusing element 40 is viewed in the direction from the emitting surface 42 toward the incident surface 41 . This suppresses the possibility that coherent light from the shaping optical system 30 is emitted from the illumination device 10 without being diffused by the light diffusion element 40 .

In the illustrated example, the light diffusing element 40 is a diffractive optical element. By using a diffractive optical element as the light diffusing element 40, it is possible to illuminate the region 90 to be illuminated in a desired shape with high accuracy. In particular, the edges of the illuminated area 90 can be sharpened.

A diffractive optical element 40 as a light diffusing element changes the traveling direction of coherent light from the light source 20 . Coherent light diffracted by the diffractive optical element 40 illuminates an illuminated area 90 on an illuminated surface 95 . The diffractive optical element 40 diffracts the coherent light from the light source 20 and directs it to the illuminated area 90 on the illuminated surface 95 . As a result, the diffracted light from the diffractive optical element 40 is projected onto the illuminated surface 95 . On the illuminated surface 95 , the illuminated area 90 is illuminated in a shape corresponding to the diffraction pattern of the diffractive optical element 40 .

The diffractive optical element 40 may be a hologram element. By using a hologram element as the diffractive optical element 40, the diffraction characteristics of the diffractive optical element 40 can be easily designed. It is relatively easy to design a hologram element capable of projecting light only on the entire desired area having a predetermined position, outline shape, size, and orientation on the illuminated surface 95 . A region irradiated with the coherent light on the irradiated surface 95 is an illuminated region 90 .

When designing the diffractive optical element 40 , the illuminated region 90 is set in real space at a predetermined position with respect to the diffractive optical element 40 with a predetermined contour shape, size and orientation. The position, contour shape, size and orientation of the illuminated area 90 on the illuminated surface 95 depend on the diffraction characteristics of the diffractive optical element 40 . By adjusting the diffraction characteristics of the diffractive optical element 40 , the position, outline shape, size and orientation of the illuminated region 90 on the illuminated surface 95 can be arbitrarily adjusted. Therefore, when designing the diffractive optical element 40, first, the position, contour shape, size and orientation of the illuminated region 90 on the illuminated surface 95 are determined. Next, the diffraction characteristics of the diffractive optical element 40 may be adjusted so that light can be projected over the determined illuminated region 90 .

The diffractive optical element 40 can be produced as a computer generated hologram (CGH). A computer-generated hologram is created by calculating a structure with arbitrary diffraction characteristics on a computer. Therefore, by adopting a computer-generated hologram as the diffractive optical element 40, generation of object light and reference light using a light source and an optical system and recording of interference fringes on a hologram recording material by exposure can be eliminated. The illumination device 10 is assumed to irradiate coherent light onto an illuminated region 90 having a predetermined contour shape, size and direction at a predetermined position with respect to the illumination device 10 . By inputting information about the illuminated region 90 into the computer as a parameter, a structure having a diffraction characteristic, such as an uneven surface, that can project diffracted light onto the illuminated region 90 can be specified by computation in the computer. By forming the specified structure by resin molding, for example, the diffractive optical element 40 as a computer-generated hologram can be produced in a simple procedure at low cost.

An iterative Fourier transform method, for example, may be used to design the diffractive optical element 40 . When the iterative Fourier transform method is used, processing may be performed on the assumption that the illuminated region 90 is far from the diffractive optical element 40, and the image projected onto the illuminated surface 95 may be the Fraunhofer diffraction image. Therefore, the illuminated surface 95 may be non-parallel to the diffraction surface of the diffractive optical element 40 .

As shown in FIG. 5 , the diffractive optical element 40 as a light diffusing element may include a plurality of element diffractive optical elements 45 . Each element diffractive optical element 45 is, for example, a hologram element, and can be configured in the same manner as the diffractive optical element 40 described above. In the example shown in FIG. 5, the coherent light beams diffracted by the plurality of diffractive optical elements 45 are irradiated to the same illuminated region 90 with each other. In other words, the light diffracted by each element diffractive optical element 45 is irradiated to the entire illuminated area 90 on the illuminated surface 95 . According to such a diffractive optical element 40 , the light directed to each position in the illuminated area 90 can be dispersed and emitted from the plurality of element diffractive optical elements 45 included in the diffractive optical element 40 . As a result, the irradiance or radiation intensity at each position on the diffractive optical element 40 is suppressed from becoming locally high, and laser safety can be improved.

Each element diffractive optical element 45 may be configured to have the same diffraction characteristics as each other. However, in order to realize projection with higher accuracy, each element diffractive optical element 45 is provided with diffraction characteristics that are individually designed according to the arrangement position of the element diffractive optical element 45 within the diffractive optical element 40. may According to this example, each element diffractive optical element 45 has its diffraction characteristics adjusted according to the difference in arrangement with other element diffractive optical elements 45 , so that the entire illuminated region 90 on the illuminated surface 95 is illuminated. It is possible to direct the diffracted light of the light only to a high precision.

The battery 70 may be a primary battery or a rechargeable secondary battery. In the illustrated example, battery 70 is a secondary battery. As shown in FIG. 6 , external connection terminals 71 are electrically connected to the battery 70 via a circuit board 72 . The external connection terminal 71 is detachably connected to an external power supply device. The battery 70 is charged via the external connection terminal 71 . Further, the external connection terminal 71 may be configured to enable direct power supply from an external power supply device to the light source 20 when the battery 70 is out or the battery 70 is low. Note that if the battery 70 is a secondary battery, the lighting device 10 does not necessarily have to be configured so that the battery 70 can be removed. Therefore, as will be described later, the casing 50 can be constructed so as not to be disassembled. As a result, there is a risk that moisture may enter the interior of the lighting device 10, and the user of the lighting device 10 may be exposed to the light source 20, the shaping optical system 30, the light diffusion element 40, the battery 70, the circuit board 72, and the like accommodated in the casing 50. is suppressed.

The circuit board 72 is electrically connected to each of the light source 20 , the battery 70 and the external connection terminals 71 . When the switch 74 is operated, the circuit board 72 electrically connects the light source 20 and the battery 70 or the external connection terminal 71, or disconnects the electrical connection between the light source 20 and the battery 70 or the external connection terminal 71. do. Thereby, power supply to the light source 20 from the battery 70 or an external power supply device and power supply stop are switched.

In the illustrated example, the switch 74 has an operating portion 75 and an elastic member (not shown) that supports the operating portion 75 . The operation unit 75 is provided at a connection position where the circuit board 72 electrically connects the light source 20 and the battery 70 or the external connection terminal 71 and the circuit board 72 between the light source 20 and the battery 70 or the external connection terminal 71. and a non-connected position where electrical connection is cut off. When the operating portion 75 is pushed toward the circuit board 72, the elastic member deforms and the operating portion 75 moves from the non-connecting position to the connecting position. As a result, the light source 20 and the battery 70 or the external connection terminal 71 are electrically connected via the circuit board 72, and power is supplied to the light source 20 from the battery 70 or an external power supply device. As a result, the light source 20 lights up and emits coherent light. Further, when the force pushing the operating portion 75 toward the circuit board 72 is removed, the operating portion 75 returns to the connected position by the restoring force of the elastic member. As a result, electrical connection between the light source 20 and the battery 70 or the external connection terminal 71 via the circuit board 72 is cut off, and power supply to the light source 20 from the battery 70 or the external power supply is stopped. As a result, the light source 20 is extinguished. In the above description, the switch 74 is a tact switch that allows power to be supplied to the light source 20 only while it is being pressed. For example, by incorporating a logic IC into the circuit board 72, a switch 74 can be pressed once to continuously power the light source 20, and pressed again to turn off power to the light source 20. can. Also, by adopting a switch 74 of a type that can physically hold and release the pressed state, continuous power supply to the light source 20 and power supply stop can be performed.

In the illustrated example, a sealing material 66 is arranged between the operating portion 75 and the casing 50 as will be described later. As a result, the operation unit 75 and the casing 50 are watertightly connected, and the waterproof performance of the lighting device 10 is improved. That is, it is possible to suppress the possibility that moisture may enter the interior of the lighting device 10 through the gap between the operation portion 75 and the casing 50 to cause malfunction of the lighting device 10 . The sealing material 66 may be composed of an adhesive material or rubber packing. Also, a sealing material 66 that seals between the operating portion 75 and the casing 50 may be formed by applying a water-repellent material or the like to the gap between the operating portion 75 and the casing 50 .

The operating lamp 76 is electrically connected to the circuit board 72 . The operation lamp 76 lights during charging of the battery 70 and when charging is completed. Thereby, the user can grasp the state of charge of the battery 70 through the operation lamp 76 . Further, the operation lamp 76 lights up when the switch 74 is pushed and placed in the connection position. Thereby, the user can grasp through the operation lamp 76 that the light source 20 and the battery 70 or the external connection terminal 71 are electrically connected. The operation lamp 76 may be configured to illuminate in different colors when the battery 70 is being charged, when the battery 70 is fully charged, and when the switch 74 is in the connected position. For example, operating lamp 76 may be configured to illuminate red when battery 70 is charging, green when battery 70 is fully charged, and blue when switch 74 is positioned in the connected position. .

The casing 50 houses the light source 20 , the shaping optical system 30 and the light diffusing element 40 . The casing 50 accommodates the light source 20, the shaping optical system 30, and the light diffusion element 40 so that only the coherent light diffused by the light diffusion element 40 is emitted. This improves the laser safety of the illumination device 10 . Note that, in the illustrated example, the casing 50 further accommodates a battery 70 and a circuit board 72 .

In normal use, light source 20 , shaping optics 30 and light diffusing element 40 are not intended to be removed from casing 50 . For this reason, the light source 20 , the shaping optical system 30 and the light diffusing element 40 are fixed to the casing 50 in a non-removable manner. Thereby, the relative positions of the light source 20 , the shaping optical system 30 and the light diffusing element 40 are maintained at the relative positions determined by the manufacturer of the illumination device 10 . Therefore, it is possible to suppress the possibility that the light source 20, the shaping optical system 30, and the light diffusion element 40 are displaced from the predetermined positions due to impact, vibration, or the like transmitted to the lighting device 10. FIG. As a result, the illuminated area 90 can be stably illuminated in a predetermined shape. In addition, the possibility that coherent light that is not diffused by the light diffusion element 40 is emitted from the illumination device 10 due to the light source 20 or the light diffusion element 40 being displaced from a predetermined position is suppressed. As a result, the laser safety of the illumination device 10 is improved. Moreover, the possibility that the user of the lighting device 10 or the like removes the light diffusion element 40 from the lighting device 10 is suppressed. This also suppresses the possibility that coherent light that is not diffused by the light diffusing element 40 is emitted from the illumination device 10, and improves laser safety of the illumination device 10. FIG. Moreover, the possibility that the light source 20 is removed from the lighting device 10 by a user or the like of the lighting device 10 and the light source 20 is used for an application not intended by the manufacturer is suppressed.

Also, in the illustrated example, the casing 50 is composed of a plurality of casing parts 51-63. A plurality of casing parts 51 - 63 define a space for housing light source 20 , shaping optical system 30 , light diffusion element 40 , battery 70 and circuit board 72 .

In the illustrated example, the casing 50 cannot be disassembled. In other words, the casing parts 51-63 are inseparably connected to each other. This also maintains the relative positions of the light source 20, the shaping optical system 30, and the light diffusion element 40. FIG. Specifically, since the casing 50 cannot be disassembled, the risk of a user or the like accessing the light source 20, the shaping optical system 30, and the light diffusion element 40 accommodated in the casing 50 is suppressed. Thereby, the relative positions of the light source 20 , the shaping optical system 30 and the light diffusing element 40 are maintained at the relative positions determined by the manufacturer of the illumination device 10 . Moreover, the possibility that the light diffusion element 40 and the light source 20 are removed from the lighting device 10 by a user or the like is suppressed. By maintaining the relative positions of the light source 20, the shaping optical system 30, and the light diffusing element 40, the illuminated area 90 can be stably illuminated in a predetermined shape. In addition, since the possibility that the light source 20 or the light diffusion element 40 is displaced from the predetermined position or the possibility that the light diffusion element 40 is removed from the lighting device 10 is suppressed, the coherent light that is not diffused by the light diffusion device 40 is emitted from the lighting device 10. The fear of being ejected is suppressed. Moreover, the possibility that the light source 20 is removed from the lighting device 10 by a user or the like of the lighting device 10 and the light source 20 is used for an application not intended by the manufacturer is suppressed.

In addition, since the battery 70 and the circuit board 72 are housed in the casing 50 , the battery 70 and the circuit board 72 are less likely to be damaged by impact, vibration, or the like transmitted to the lighting device 10 . In the illustrated example, battery 70 and circuit board 72 are permanently secured to casing 50 . This suppresses the possibility that the battery 70 and the circuit board 72 will be removed from the lighting device 10 and used for purposes not intended by the manufacturer. Furthermore, since the casing 50 cannot be disassembled, the user or the like cannot access the battery 70 and the circuit board 72 housed in the casing 50 . As a result, it is possible to more effectively suppress the possibility that the battery 70 or the circuit board 72 will be removed from the lighting device 10 by a user or the like and used for purposes not intended by the manufacturer.

A plurality of casing parts 51 to 63 constituting casing 50 may be connected by screwing or fitting. In this case, the casing 50 may not be disassembled by applying an adhesive to the screwed portions and fitting portions of the casing parts 51-63.

A plurality of casing parts 51 - 63 may be watertightly connected by seals 66 . In this case, the waterproof performance of the lighting device 10 can be improved. That is, it is possible to suppress the possibility that moisture may enter the interior of the lighting device 10 and cause a problem in the operation of the lighting device 10 . The sealing material 66 may be composed of the above-described adhesive or rubber packing. Alternatively, the sealing material 66 may be formed by applying a water-repellent material to the entrance of the passage through which moisture may enter.

3, 7 and 8, casing 50 will be described in more detail. In the examples shown in FIGS. 3, 7 and 8, the casing 50 includes an outer casing 51 and an inner casing 60 housed in the outer casing 51. As shown in FIG.

The inner casing 60 supports the light emitting portion 21 of the light source 20 , the shaping optical system 30 and the light diffusing element 40 . As shown in FIG. 3, the inner casing 60 has a first end face 60a facing one side in the first direction D1 and a second end face 60b facing the other side in the first direction D1. As shown in FIG. 7, the light diffusion element 40 is fixed to the first end surface 60a. As shown in FIG. 3, lead terminals 22 of the light source 20 extend from the second end surface 60b. A battery 70 and a circuit board 72 are housed in a space surrounded by the second end face 60b and the outer casing 51. As shown in FIG.

In the illustrated example, the inner casing 60 has a tubular portion 61 and a first lid portion 62 and a second lid portion 63 fixed to both ends of the tubular portion 61 . The first lid portion 62 is connected to the tubular portion 61 from the other side in the first direction D1. The second lid portion 63 is connected to the cylindrical portion 61 from one side in the first direction D1.

The first lid portion 62 has a tubular wall portion 62a centered on an axis extending in the first direction D1, and a bottom portion 62b that closes one end of the tubular wall portion 62a. The bottom portion 62b closes the end of the wall portion 62a facing the other side in the first direction D1. An opening is provided in the bottom portion 62b. A light source 20 is inserted through the opening. The light emitting portion 21 of the light source 20 is fixed to the surface of the bottom portion 62b facing one side in the first direction D1. Thus, the first lid portion 62 holds the light source 20 .

The tubular portion 61 is formed in a tubular shape centered on an axis extending in the first direction D1. An end portion of the tubular portion 61 facing the other side in the first direction D1 is accommodated in the first lid portion 62 . Therefore, the tubular portion 61 accommodates the light emitting portion 21 of the light source 20 . Further, the tubular portion 61 accommodates the shaping optical system 30 .

As shown in FIG. 3 , the inner dimension of the cylindrical portion 61 increases from upstream to downstream along the optical path of the coherent light emitted from the light source 20 . In the illustrated example, the inner surface of the cylindrical portion 61 is formed with three stepped portions 61a. A first lens 31, a second lens 32 and a third lens 33 are attached to each of the three stepped portions 61a. A spacing ring 65 is provided in the tubular portion 61 so that the inter-lens distance can be controlled with high accuracy. A spacing ring 65 is arranged between the first lens 31 and the second lens 32 . A spacing ring 65 is arranged between the second lens 32 and the third lens 33 . A pressing ring 67 is arranged between the second lid portion 63 and the third lens 33 . The stepped portion 61a, the spacing ring 65, and the pressing ring 67 suppress relative displacement of the lenses 31, 32, and 33 due to vibration, impact, or the like transmitted to the lighting device 10. FIG. That is, according to the step portion 61a, the spacing ring 65, and the pressing ring 67, it is possible to suppress deviation of the parallelism of the collimated light due to the vibration, impact, or the like. Accordingly, it is possible to suppress blurring of the illuminated region 90 on the illuminated surface 95 . In addition, the pressing ring 67 suppresses relative positional deviation between the shaping optical system 30 and the light diffusing element 40 due to vibration, impact, or the like transmitted to the lighting device 10 . As a result, the illuminated area 90 can be stably illuminated at a predetermined position and in a predetermined shape. Moreover, the possibility that the light emitted from the shaping optical system 30 is emitted from the illumination device 10 without being diffused by the light diffusion element 40 is suppressed.

The spacing ring 65 and the pressing ring 67 may be, for example, annular or tubular members. As the spacing ring 65 and the pressing ring 67, metal such as aluminum may be used, or resin may be used. The resin may be mixed with an inorganic material such as glass fiber in order to reduce the coefficient of thermal expansion.

The second lid portion 63 has a cylindrical wall portion 63a centered on an axis extending along the first direction D1, and a top surface portion 63b that closes one end of the wall portion 63a. The top surface portion 63b closes the end of the wall portion 63a facing one side in the first direction D1. The cylindrical portion 61 is inserted into the second lid portion 63 . In the illustrated example, a sealing material 66 is arranged between the wall portion 63 a and the outer casing 51 . The sealing material 66 extends annularly along the circumferential direction of the outer peripheral surface of the wall portion 63 a and the inner peripheral surface of the outer casing 51 . As a result, the risk of water entering the outer casing 51 through the gap between the outer casing 51 and the inner casing 60 is suppressed.

As shown in FIG. 3, the top surface 63b is provided with an opening 63h through which the light shaped by the shaping optical system 30 passes. As shown well in FIG. 7, the light diffusion element 40 is fixed to the top surface portion 63b. The light diffusion element 40 is arranged so as to overlap with the opening 63h when viewed in the first direction D1. More specifically, a holding portion 64 that holds the edge portion of the light diffusion element 40 is provided on the top surface portion 63b. The holding portion 64 is provided around the opening 63h. This prevents light emitted from the light source 20 and passing through the opening 63 h and the light diffusion element 40 from interfering with the holding portion 64 .

A circumferential sealing member 66 is provided between the top surface portion 63 b and the outer casing 51 . The sealing material 66 is arranged so as to overlap the boundary portion between the edge portion of the light diffusion element 40 and the top surface portion 63b when viewed in the first direction D1. This suppresses the risk of moisture entering the inner casing 60 through the gap between the light diffusing element 40 and the top surface portion 63b.

The sealing material 66 that seals the boundary between the edge of the light diffusing element 40 and the top surface 63b may also be made of adhesive or rubber packing. In addition, by applying a water-repellent material or the like to the boundary portion between the edge portion of the light diffusion element 40 and the top surface portion 63b, the boundary portion between the edge portion of the light diffusion element 40 and the top surface portion 63b is sealed. Material 66 may be formed.

In order to keep the relative positions of the light source 20, the shaping optical system 30, and the light diffusion element 40 constant, the light source 20, the shaping optical system 30, and the light diffusion element 40 are fixed to the inner casing 60 by fixing using an adhesive. good too.

Spacers, for example, may be used to finely adjust the relative positions of the light source 20, the shaping optical system 30, and the light diffusion element 40. FIG. As the spacer, a thin metal plate-shaped material may be used. The spacer may function as a spacing ring 65, an adhesive, or a sealing material 66. FIG.

Alternatively, the light source 20, the shaping optical system 30, and the light diffusing element 40 may be held by a position adjustment holder capable of finely adjusting the arrangement. The position adjustment holder may finely adjust the positions of the light source 20, the shaping optical system 30, and the light diffusion element 40 by operating adjustment parts such as screws. The light source 20, the shaping optical system 30, and the light diffusing element 40 may be fixed to the casing 50 (the inner casing 60 in the illustrated example) via position adjustment holders. When the position adjusting holder is used, after the positions of the components 20, 30, and 40 are adjusted, the adjustment parts such as screws may be fixed by an adhesive or the like. In addition, the position adjustment holder may function as the spacing ring 65, the adhesive material, and the sealing material 66. FIG.

The outer casing 51 has a first portion 52 that houses the inner casing 60 and a second portion 56 that houses the battery 70 and the circuit board 72 . The first portion 52 of the outer casing 51 includes a first tubular portion 53 , a second tubular portion 54 and a top portion 55 . The first tubular portion 53 and the second tubular portion 54 are formed in a tubular shape about an axis extending along the first direction D1. The second tubular portion 54 is connected to the first tubular portion 53 from one side in the first direction D1.

The first tubular portion 53 has a first end portion 53a located on one side in the first direction D1 and a second end portion 53b located on the other side in the first direction D1. The second tubular portion 54 has a first end portion 54a located on one side in the first direction D1 and a second end portion 54b located on the other side in the first direction D1. A first end portion 53 a of the first tubular portion 53 is connected to a second end portion 54 b of the second tubular portion 54 .

The top surface portion 55 has a flat plate shape. The top surface portion 55 is arranged inside the second cylindrical portion 54 . The top surface portion 55 closes the first end portion 54 a of the second cylindrical portion 54 . The top surface portion 55 is formed with an opening 55h through which the light emitted from the light diffusion element 40 passes.

The second portion 56 of the outer casing 51 has a first tubular portion 57 that accommodates the battery 70 and a second tubular portion 58 that accommodates the circuit board 72 . The first tubular portion 57 is formed in a tubular shape about an axis extending along the first direction D1. The second tubular portion 58 is also generally tubular with the axis extending along the first direction D1 as the center. The first cylindrical portion 57 has a first end portion 57a located on one side in the first direction D1 and a second end portion 57b located on the other side in the first direction D1. The second tubular portion 58 has a first end 58a located on one side in the first direction D1 and a second end 58b located on the other side in the first direction D1. A first end portion 57 a of the first tubular portion 57 is connected to a second end portion 58 b of the second tubular portion 58 . A first end 58 a of the second tubular portion 58 is connected to a second end 53 b of the first tubular portion 53 of the first portion 52 . The second portion 56 also has a bottom portion 59 that closes the second end 57b of the first tubular portion 57 .

As can be seen from FIGS. 2 and 3, external connection terminals 71 are fixed to the bottom portion 59 . An external power source can be connected to the external connection terminal 71 from the other side of the bottom portion 59 in the first direction D1. The bottom portion 59 may have a cap that covers the external connection terminals 71 from the other side in the first direction D1. In the illustrated example, the bottom portion 59 is provided with a strap attachment portion 59h. The strap attachment portion 59h is, for example, a hole through which a strap can be inserted. By attaching a strap to the strap attachment portion 59h, the lighting device 10 can be easily carried. In the illustrated example, the bottom portion 59 is provided with anti-rolling means 59r. The rolling prevention means 59r prevents the lighting device 10 from unintentionally rolling on the flat surface when the lighting device 10 is placed on the flat surface. In the illustrated example, the anti-rolling means 59r is a flat surface provided on the outer peripheral surface of the bottom portion 59. As shown in FIG. A plane serving as the anti-rolling means 59r extends in a direction that intersects the radial direction of a circle centered on the axis extending along the first direction D1. Note that the anti-rolling means 59r is not limited to a flat surface, and may be grooves, projections, or unevenness provided on the outer peripheral surface of the bottom portion 59. FIG. Alternatively, the anti-rolling means 59r may be a rubber, resin, or fabric material that covers at least a portion of the outer peripheral surface of the bottom portion 59. As shown in FIG. Such anti-rolling means 59r also serves as a non-slip to prevent the lighting device 10 from moving in the user's hand when the lighting device 10 is held and used. It should be noted that the anti-rolling means 59r does not include other components of the outer casing 51 (in the illustrated example, the first cylindrical portion 53 and the second cylindrical portion 54 of the first portion 52, and the first cylindrical portion of the second portion 56). It may be provided on the outer peripheral surface of the shaped portion 57 or the second cylindrical portion 58).

A battery 70 is non-removably fixed in the first tubular portion 57 . The battery 70 is electrically connected to an external connection terminal 71 within the first tubular portion 57 .

The second tubular portion 58 holds a circuit board 72 , a switch 74 and an operating lamp 76 . The circuit board 72 is non-removably fixed within the second tubular portion 58 . Lead terminals 22 of the light source 20 extend into the second cylindrical portion 58 . The lead terminals 22 are electrically connected to the circuit board 72 .

As shown in FIG. 8, the second tubular portion 58 is provided with openings 58h and 58i that open in a direction that intersects the first direction D1 (the third direction D3 in the illustrated example). An operating portion 75 of a switch 74 is inserted through the opening 58h. An operation lamp 76 is inserted through the opening 58i. A sealing material 66 for sealing a gap between the operation portion 75 or the operation lamp 76 and the second cylindrical portion 58 is provided in the openings 58h and 58i.

Various modifications can be made to the embodiment described above.

As shown in FIG. 9 , lighting device 10 may have a plurality of lighting fixtures 15 . In the example shown in FIG. 9, each luminaire 15 may comprise the light source 20, shaping optics 30 and light diffusing element 40 described with reference to FIGS. 3-5. In the example shown in FIG. 9, multiple lighting fixtures 15 may include light sources 20 that emit coherent light of different wavelengths. In the example shown in FIG. 9 , the illumination device 10 has multiple light sources 20 and multiple light diffusion elements 40 provided corresponding to the respective light sources 20 . The coherent light emitted from each lighting device 15 overlaps the illuminated area 90 on the illuminated surface 95, so that the illuminated area 90 can be illuminated with a desired color. The lighting device 10 shown in FIG. 9 has first to third lighting fixtures 15A to 15C. Each lighting fixture 15A-15C has a separate light source 20A-20C, shaping optical system 30A-30C and light diffusion element 40A-40C.

In the example shown in FIG. 9, multiple lighting fixtures 15 may include light sources 20 that emit light of the same wavelength. The coherent illumination light emitted from each lighting device 15 overlaps the illuminated region 90 of the illuminated surface 95, so that the illuminated region 90 can be illuminated brightly.

In the example shown in FIG. 9, the plurality of lighting fixtures 15A-15C are arranged in the third direction D3. Not limited to the example shown in FIG. 9, the plurality of lighting fixtures 15A to 15C may be arranged in the second direction D2, for example.

As shown in FIG. 10, the lighting device 10 may have a scanning device 80 . The illumination device 10 shown in FIG. 10 has a plurality of light diffusion elements 40A-40C. The scanning device 80 adjusts the optical path of the coherent light emitted by the light source 20 to control whether or not the coherent light is supplied to the light diffusion element 40 and how the coherent light is distributed to the plurality of light diffusion elements 40A to 40C. do. Scanning device 80 may be constructed using various components or the like that may change the optical path using refraction, reflection, diffraction, or the like. Lenses, prisms, mirrors, diffractive optical elements and the like are examples of various parts that can change the optical path.

Scanning device 80 changes the optical path of coherent light from light source 20 over time. As a result, the incident position of coherent light is moved on the plurality of light diffusion elements 40A to 40C. That is, the light diffusing element 40 on which the coherent light from the light source 20 is incident changes among the plurality of light diffusing elements 40A to 40C. The illustrated scanning device 80 has a reflective surface that is rotatable about an axis RA. A galvanomirror may be used as such a scanning device 80 .

The illuminated area 90 may be divided into a plurality of partial areas 93A, 93B, and 93C according to positions in the first direction D1. A plurality of light diffusion elements 40A-40C may illuminate different partial regions 93A, 93B, 93C. According to this example, the diffraction angle range of light diffracted by one light diffusion element 40 can be narrowed. Thereby, the diffraction efficiency of each light diffusing element 40 is improved. It should be noted that scanning device 80 operates at a speed that exceeds the resolution of human vision, so that it appears to humans that all partial regions 93A, 93B, and 93C included in illuminated region 90 continue to be illuminated at the same time. Observed.

In the example shown in FIG. 11, the light diffusing element 40 includes first to twelfth light diffusing elements 40A to 40L. For example, the illuminated area 90 on the illuminated surface 95 is divided into first to twelfth partial areas 93A to 93L. The coherent light beams diffracted by the first to twelfth light diffusing elements 40A to 40L are projected onto separate first to twelfth partial regions 93A to 93L, respectively. Scanning device 80 directs light from light source 20 onto each light diffusing element 40A-40L. The illumination device 10 can control whether or not to irradiate light to each of the light diffusion elements 40A to 40L according to the operation of the scanning device 80. FIG. For example, the light source 20 switches between emitting light and stopping emitting light according to the operation of the scanning device 80 . As another example, a light blocking member that blocks light enters and retreats from the optical path of the light from the light source 20 according to the operation of the scanning device 80 . Coherent light can be projected only to arbitrary light diffusion elements 40A to 40L by controlling the presence or absence of irradiation of light to each of the light diffusion elements 40A to 40L. As a result, it is possible to illuminate only the arbitrary first to twelfth partial areas 93A to 93L, and to illuminate the inside of the illuminated area 90 in a desired shape.

The light diffusion element 40 included in the illumination device 10 shown in FIGS. 9 to 11 may be divided into a plurality of elemental light diffusion elements (elemental diffractive optical elements) 45. FIG.

Furthermore, the light diffusing element 40 may not be a diffractive optical element. For example, light diffusing element 40 may be a microlens array. The microlens array is formed by arranging a plurality of unit lenses 46 made of convex lenses. The plurality of unit lenses 46 are arranged such that their optical axes are parallel to each other. Also, the plurality of unit lenses 46 are arranged on a virtual plane perpendicular to the optical axis. When the light diffusing element 40 is a microlens array, as shown in FIG. 12, by arranging a mask 47 corresponding to each unit lens 46, the illuminated region 90 is illuminated in a shape corresponding to the shape of the mask 47. can do. In the illustrated example, the mask 47 is arranged on the downstream side of the light diffusion element 40 along the optical path of the coherent light emitted from the light source 20, but it is not limited to this. The mask 47 may be arranged upstream of the light diffusing element 40 along the optical path of the coherent light emitted from the light source 20 , that is, between the shaping optical system 30 and the light diffusing element 40 .

Also, the illumination device 10 may not have the battery 70 . When the lighting device 10 does not include the battery 70, the lighting device 10 is lightened, and as a result, it is excellent in resistance to vibration and impact. If the lighting device 10 does not include the battery 70 , power may be supplied to the light source 20 from an external power supply device via the external connection terminal 71 . Even when power is supplied to the light source 20 from an external power supply device through the external connection terminal 71, the casing 50 can be configured so as not to be disassembled. This suppresses the risk of moisture entering the interior of the lighting device 10 . In addition, the possibility that the user of the illumination device 10 or the like accesses the light source 20, the shaping optical system 30, the light diffusion element 40, the circuit board 72, etc. accommodated in the casing 50 is suppressed.

The lighting device 10 may have a temperature control mechanism. The temperature control mechanism may maintain the temperature of the light source 20 and the circuit board 72 within a predetermined range. The temperature control mechanism may heat or cool the light source 20 or the circuit board 72 . The temperature control mechanism may be installed within casing 50 . Fans, heaters, and coolers are exemplified as temperature control mechanisms. A heating wire, a Peltier element, or the like may be used as the temperature control mechanism.

In one embodiment described above, the illumination device 10 has a light source 20 , a shaping optical system 30 , a light diffusion element 40 and a casing 50 . The light source 20 emits coherent light. The shaping optical system 30 shapes coherent light emitted from the light source 20 . The light diffusing element 40 diffuses the coherent light shaped by the shaping optical system 30 . The casing 50 houses the light source 20 , the shaping optical system 30 and the light diffusing element 40 . The light source 20 , the shaping optical system 30 and the light diffusing element 40 are fixed to the casing 50 in a non-removable manner. Thereby, the relative positions of the light source 20 , the shaping optical system 30 and the light diffusing element 40 are maintained at the relative positions determined by the manufacturer of the illumination device 10 . Therefore, it is possible to suppress the possibility that the light source 20, the shaping optical system 30, and the light diffusion element 40 are displaced from the predetermined positions due to the impact or vibration transmitted to the illumination device 10, and the illuminated region 90 can be kept in the intended position. Stable and stable lighting. In addition, coherent light that is not diffused by the light diffusion element 40 is less likely to be emitted from the illumination device 10, and laser safety can be improved. Moreover, the possibility that the user of the lighting device 10 or the like removes the light diffusion element 40 from the lighting device 10 is suppressed. This also suppresses the possibility that coherent light that is not diffused by the light diffusing element 40 is emitted from the illumination device 10, thereby improving laser safety. In addition, the possibility that the light source 20 is removed from the lighting device 10 by the user or the like of the lighting device 10 and the light source 20 is used for purposes not intended by the manufacturer is suppressed.

Moreover, in the embodiment described above, the light diffusion element 40 is a diffractive optical element. This makes it possible to illuminate the illuminated area 90 in a desired shape with high accuracy.

Moreover, in one embodiment described above, the light diffusion element 40 may be a microlens array. Also in this case, by using the mask 47, the region 90 to be illuminated can be illuminated in a desired shape.

Moreover, in one embodiment described above, the illumination device 10 further includes a battery 70 that supplies power to the light source 20 . Battery 70 is housed in casing 50 and fixed to casing 50 irremovably. Since the battery 70 is housed in the casing 50 , the risk of the battery 70 being damaged by shock or vibration transmitted to the lighting device 10 is suppressed. In addition, since the battery 70 is irremovably fixed to the casing 50, the risk of the battery 70 being removed from the lighting device 10 and being used for purposes not intended by the manufacturer is suppressed.

Further, in the embodiment described above, the lighting device 10 further includes a secondary battery 70 that supplies power to the light source 20, and an external connection terminal 71 that is detachably connected to an external power supply device, The secondary battery 70 is charged through the external connection terminal 71 . In this case, it is not always necessary to remove the battery 70 from the lighting device 10 . Therefore, the casing 50 can be constructed so as not to be disassembled. This suppresses the risk of moisture entering the interior of the lighting device 10 . In addition, the possibility that the user or the like of the illumination device 10 accesses the light source 20, the shaping optical system 30, the light diffusion element 40, the battery 70, the circuit board 72, etc. accommodated in the casing 50 is suppressed.

Further, in the embodiment described above, the lighting device 10 may further include an external connection terminal 71 that is detachably connected to an external power supply device. Power may be supplied to the light source 20 . In this case, lighting device 10 may not include battery 70 . When the lighting device 10 does not include the battery 70, the lighting device 10 is lightened, and as a result, it is excellent in resistance to vibration and impact. Further, when power is supplied to the light source 20 from an external power supply device via the external connection terminal 71, the casing 50 can be configured so as not to be disassembled. This suppresses the risk of moisture entering the interior of the lighting device 10 . In addition, the possibility that the user of the illumination device 10 or the like accesses the light source 20, the shaping optical system 30, the light diffusion element 40, the circuit board 72, etc. accommodated in the casing 50 is suppressed.

Further, in the embodiment described above, the casing 50 includes a plurality of casing parts 51-63 that define a space for housing the light source 20, the shaping optical system 30, and the light diffusing element 40. FIG. A plurality of casing parts 51-63 are inseparably connected to each other. As a result, the risk of moisture entering the interior of the casing 50 is suppressed. In addition, the possibility that the user or the like of the illumination device 10 accesses the light source 20, the shaping optical system 30, the light diffusion element 40, the battery 70, the circuit board 72, etc. accommodated in the casing 50 is suppressed.

Moreover, in the embodiment described above, the plurality of casing parts 51 to 63 are connected via the sealing material 66 . As a result, the risk of moisture entering the interior of the casing 50 is suppressed.

In addition, in the embodiment described above, lighting device 10 further includes circuit board 72 electrically connected to light source 20 . Casing 50 houses circuit board 72 . As a result, the risk of damage to the circuit board 72 due to impact or vibration transmitted to the lighting device 10 is suppressed.

In the embodiment described above, the light diffusion element 40 has an incident surface 41 on which the light from the shaping optical system 30 is incident, and diffuses the light from the shaping optical system 30 on the incident surface 41. Unevenness is formed. This suppresses the possibility that the light diffusion element 40 is damaged and the unevenness is lost. As a result, the light from the shaping optical system 30 can be diffused by the light diffusion element 40 with high reliability.

In the embodiment described above, the light diffusing element 40 has the exit surface 42 from which the light incident on the entrance surface 41 exits. The unevenness of the light diffusing element 40 is formed over at least the entire region of the incident surface 41 that overlaps with the emitting surface 42 when the light diffusing element 40 is viewed in the direction from the emitting surface 42 toward the incident surface 41 . This suppresses the possibility that coherent light that is not diffused is emitted from the light diffusion element 40 .

Moreover, in the embodiment described above, only the light diffused by the light diffusion element 40 is emitted. This improves the laser safety of the illumination device 10 .

Further, in the embodiment described above, the outer peripheral surface of the casing 50 is provided with anti-rolling means 59r. Accordingly, it is possible to prevent the lighting device 10 from unintentionally rolling on the flat surface when the lighting device 10 is placed on the flat surface.

Although one embodiment has been described above with reference to specific examples, one embodiment is not limited by the specific examples. The above-described embodiment can be implemented in various other specific examples, and various omissions, replacements, changes, additions, etc. can be made without departing from the scope of the invention.

10: lighting device, 20: light source, 21: light emitting part, 22: lead terminal, 30: shaping optical system, 31: first lens, 32: second lens, 33: third lens, 40: light diffusion element, 41: Incidence surface, 42: Output surface, 45: Element diffraction optical element, 50: Casing, 51: Outer casing, 60: Inner casing, 70: Battery, 71: External connection terminal, 76: Operation lamp, 72: Circuit board , 74: switch, 90: illuminated area, 95: illuminated surface, D1: first direction, D2: second direction, D3: third direction

Claims (13)

a light source that emits coherent light;
a shaping optical system that shapes coherent light emitted from the light source;
a light diffusion element that diffuses the coherent light shaped by the shaping optical system;
a casing that houses the light source, the shaping optical system, and the light diffusion element;
The lighting device, wherein the light source, the shaping optical system, and the light diffusing element are non-removably fixed to the casing. 2. The illumination device according to claim 1, wherein said light diffusing element is a diffractive optical element. 2. The illumination device of claim 1, wherein the light diffusing element is a microlens array. further comprising a battery for powering the light source;
4. A lighting device according to any preceding claim, wherein the battery is housed in the casing and fixed to the casing in a non-removable manner. a secondary battery that supplies power to the light source;
an external connection terminal detachably connected to an external power supply,
The lighting device according to any one of claims 1 to 4, wherein the secondary battery is charged via the external connection terminal. further comprising an external connection terminal detachably connected to an external power supply,
5. The lighting device according to claim 1, wherein power is supplied from said power supply device to said light source via said external connection terminal. The casing includes a plurality of casing parts defining a space for housing the light source, the shaping optical system, and the light diffusion element,
7. A lighting device according to any one of the preceding claims, wherein the plurality of casing parts are inseparably connected to each other. 8. The lighting device according to claim 7, wherein said plurality of casing components are connected via a sealing material. further comprising a circuit board electrically connected to the light source;
9. The lighting device according to any one of the preceding claims, wherein said casing houses said circuit board. The light diffusing element has an incident surface on which light from the shaping optical system is incident,
The illumination device according to any one of claims 1 to 9, wherein unevenness for diffusing light from said shaping optical system is formed on said incident surface. The light diffusing element has an exit surface from which light incident on the incident surface exits,
11. The lighting system according to claim 10, wherein the unevenness is formed over an entire region of the incident surface that overlaps at least the output surface when the light diffusing element is viewed in a direction from the output surface toward the incident surface. Device. 12. The lighting device according to claim 11, wherein only light diffused by said light diffusing element is emitted. 13. The lighting device according to any one of claims 1 to 12, wherein the outer peripheral surface of the casing is provided with anti-rolling means.

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