JP2020095266A - Portable illumination device - Google Patents

Abstract

To change an illumination pattern as necessary.SOLUTION: A portable illumination device 1 comprises: a light source 4 that emits coherent light; a shaping optical system 5 that shapes the coherent light emitted from the light source; and a diffraction optical element 6 that diffracts the coherent light shaped by the shaping optical system. The diffraction optical element has a plurality of diffraction parts that can change an illumination pattern for illuminating a surface to be illuminated, and the diffraction optical element illuminates the surface to be illuminated simultaneously in two or more types of illumination patterns, or illuminates the surface to be illuminated at different timings from each other in different illumination patterns from each other.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a portable lighting device that illuminates with coherent light.

Since coherent light such as laser light is excellent in straightness, it is possible to illuminate with a clear illumination pattern with little illumination blur even at a distance. Due to such characteristics, an illumination device using coherent light has been proposed. For example, Patent Document 1 discloses an illuminating device that performs linear illumination with a uniform width up to a distance. Even if an illuminating device using coherent light is excellent in straightness, the illuminating intensity decreases as the distance increases, and the boundary of the illuminating range becomes unclear. For this reason, in Patent Document 1, the diffractive optical element is divided into a plurality of element diffractive areas, and the diffraction characteristics are changed for each element diffractive area, thereby changing the illumination mode of the illuminated surface depending on the location.

International publication 2017/217420

However, the illumination device of Patent Document 1 only assumes that the same illumination pattern is always illuminated, and the illumination pattern cannot be switched depending on time and case. Since a portable lighting device is used for various purposes, it is useful if the lighting pattern can be switched as needed.

The present disclosure has been made in view of the above points, and provides a portable lighting device that can switch an illumination pattern as necessary.

In order to solve the above problems, in the present disclosure, a light source that emits coherent light,
A shaping optical system that shapes the coherent light emitted from the light source,
A diffractive optical element for diffracting the coherent light shaped by the shaping optical system,
The diffractive optical element has a plurality of diffractive sections capable of switching an illumination pattern for illuminating a surface to be illuminated,
A portable lighting device is provided, wherein the diffractive optical element simultaneously illuminates the illuminated surface with two or more types of illumination patterns, or illuminates the illuminated surface with different illumination patterns at different timings.

Coherent light shaped by the shaping optical system is constantly irradiated to a part of the plurality of diffractive portions,
The diffractive optical element can switch whether or not to irradiate the coherent light shaped by the shaping optical system to the remaining diffractive portions other than the some diffractive portions of the plurality of diffractive portions. ,
The diffractive optical element is an illumination pattern diffracted by the part of the diffractive part, and an illumination pattern diffracted by a diffractive part of the remaining diffractive part which is irradiated with coherent light shaped by the shaping optical system. The illuminated surface may be illuminated with.

At least a part of the plurality of diffractive parts is provided with a retreating part that retreats to a position where the coherent light shaped by the shaping optical system is not irradiated.
The diffractive optical element may switch at least a part of the illumination pattern on the illuminated surface by switching the diffractive unit to be retracted by the retracting unit.

The retracting unit has a slide mechanism that slides two or more diffractive parts of the plurality of diffractive parts in at least one direction,
The diffractive optical element may switch at least a part of the illumination pattern on the illuminated surface by switching the diffractive portion to which the coherent light shaped by the shaping optical system is emitted by the slide mechanism.

A detachable portion for attaching and detaching at least a part of the plurality of diffractive portions,
The diffractive optical element may switch at least a part of an illumination pattern on the illuminated surface by switching a diffractive section attached to the attachment/detachment section.

The attachment/detachment portion is arranged at a place where the attached diffractive portion is irradiated with coherent light shaped by the shaping optical system,
The coherent light diffracted by the diffractive unit mounted on the attachment/detachment unit may illuminate the illuminated surface with an illumination pattern corresponding to the mounted diffractive unit.

The attaching/detaching portion attaches/detaches a part of the plurality of diffracting portions,
Of the plurality of diffractive parts, the remaining diffractive parts other than the part of the diffractive parts are always irradiated with coherent light shaped by the shaping optical system,
The diffractive optical element may illuminate the illuminated surface with an illumination pattern diffracted by a diffractive portion attached to the attachment/detachment portion and an illumination pattern diffracted by the remaining diffractive portions.

A light control member that is disposed between at least a part of the plurality of diffractive portions and the shaping optical system and that switches transmission or blocking of coherent light shaped by the shaping optical system,
The diffractive optical element may switch at least a part of an illumination pattern of the illuminated surface by switching a diffractive portion that blocks coherent light with the light control member.

A scanning member that scans coherent light by at least a part of the plurality of diffractive portions by controlling the traveling direction of the coherent light shaped by the shaping optical system or the coherent light before being incident on the shaping optical system. When,
A scanning control unit that switches a scanning range of the scanning member may be provided so that at least a part of the illumination pattern on the illuminated surface can be switched.

The light source has a plurality of light source units each emitting coherent light,
The shaping optical system is provided corresponding to each of the plurality of light source units, and has a plurality of light shaping units that shape coherent light emitted from the corresponding light source units,
Coherent light shaped by the corresponding light shaping unit is incident on each of the plurality of diffractive units,
The plurality of light source units may be capable of switching whether or not to make coherent light incident on the corresponding light shaping unit.

The light source has a plurality of light source units each emitting coherent light,
The shaping optical system is provided corresponding to each of the plurality of light source units, and has a plurality of light shaping units that shape coherent light emitted from the corresponding light source units,
Coherent light shaped by the corresponding light shaping unit is incident on each of the plurality of diffractive units,
An illumination control unit that switches whether or not the coherent light emitted from the plurality of light source units is incident on the corresponding light shaping unit may be further included.

A first optical structure having a first end face that houses the light source and the shaping optical system, and emits coherent light shaped by the shaping optical system;
A second optical structure that houses the first optical structure and has the diffractive optical element disposed on a second end face, and guides coherent light emitted from the first end face to the diffractive optical element. And
The second optical structure has a support portion that supports the first optical structure such that the orientation of the first optical structure remains unchanged even if the orientation of the second optical structure is changed,
By changing the direction of the second optical structure, the incident position of the coherent light emitted from the first end face of the second optical structure on the second end face is changed to illuminate the illuminated surface. You may switch at least one part of a pattern.

At least one of the plurality of diffractive portions has a plurality of element diffractive portions arranged in the two-dimensional direction,
Each of the plurality of element diffractive sections may have an interference fringe for the corresponding diffractive section to form at least a part of an illumination pattern that illuminates the illuminated surface.

The illumination pattern in which the plurality of diffractive portions illuminate the irradiated surface may include at least one of a character, a pattern, a color pattern, a symbol, a mark, an illustration, a character, and a pictogram.

The plurality of diffractive sections has a diffractive section that generates an illumination pattern that represents a direction, and a diffractive section that generates an illumination pattern that represents information related to the direction,
The diffractive optical element may illuminate the illuminated surface such that an illumination pattern indicating a direction and an illumination pattern indicating information related to the direction are displayed simultaneously.

According to the present disclosure, the illumination pattern can be switched as needed.

1 is a perspective view of a portable lighting device according to a first embodiment of the present disclosure. The figure which shows the internal structure of the portable illuminating device 1 of FIG. The top view of the diffractive optical element by this embodiment. The figure which shows the example which the whole diffractive optical element was comprised by the several element diffraction part. (A) is a figure which shows an example of the illumination pattern ILP of a diffraction part, (b) is a figure which shows an example of the illumination pattern of a diffraction part, (c) is a figure which shows an example of the illumination aspect of the irradiation surface by a diffractive optical element. .. The figure which shows the internal structure of the portable illuminating device by 2nd Embodiment. The top view of the diffractive optical element of the portable illuminating device of FIG. The perspective view which expanded the front end side end surface vicinity of a portable illuminating device. The figure which shows the example which displays two types of illumination patterns on a to-be-irradiated surface in 2nd Embodiment. The figure which expanded the front end side edge surface vicinity of the portable illuminating device by 3rd Embodiment. The figure which shows an internal structure when a diffraction part is inserted in the attachment/detachment port of a slot mechanism. The figure which shows the internal structure of the portable illuminating device by 4th Embodiment. The figure which shows the example which displays two types of illumination patterns on a to-be-irradiated surface in 4th Embodiment. The figure which shows the internal structure of the portable illuminating device by 5th Embodiment. The figure which shows the internal structure of the portable illuminating device by 5th Embodiment. The figure which shows the internal structure of the portable illuminating device by 6th Embodiment. (A) And (b) is a top view of the diffractive optical element in the portable illuminating device of FIG. The figure which shows the beam shape of coherent light. (A) And (b) is a figure which shows the internal structure of the portable illuminating device by 7th Embodiment. (A) And (b) is a top view of a diffractive optical element. The figure which shows the example which provides three light sources from which the light emission wavelength band differs. The figure which shows the internal structure of the portable illuminating device by 8th Embodiment. The figure which shows the internal structure of the portable illuminating device by the modification of 8th Embodiment. The figure which shows the internal structure of the portable illuminating device by 9th Embodiment.

Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In addition, in the drawings attached to the present specification, for convenience of illustration and understanding, the scale, the vertical and horizontal dimension ratios, etc. are appropriately changed and exaggerated from the actual ones.

Further, as used in the present specification, the shape and geometric conditions and their degrees are specified. For example, terms such as “parallel”, “orthogonal”, “identical”, and values of length and angle are strictly defined. It should be understood that the same function is included in a range that can be expected without being bound by any meaning.

(First embodiment)
1 is a perspective view of a portable lighting device 1 according to the first embodiment of the present disclosure, and FIG. 2 is a diagram showing an internal configuration of the portable lighting device 1 of FIG. As shown in FIG. 1, the portable lighting device 1 according to the present embodiment has an external dimension that can be grasped by a human hand without difficulty, and has a cylindrical shape with a diameter of, for example, about 10 to 80 mm. The length is, for example, about 100 to 300 mm. The outer shape is not limited to the cylindrical shape, and may be a square shape. Moreover, even if it is cylindrical, the diameter may differ between the front end side and the rear end side. On the surface of the portable lighting device 1, a switch 2 for switching on/off of lighting is provided. The position of the switch 2 is arbitrary and may be provided on the peripheral surface as shown in FIG. 1 or may be provided near the end surface on the rear end side.

The housing 3 of the portable lighting device 1 is made of a metal such as aluminum or a resin, and the tip end face 1a of the portable lighting device 1 is provided with an opening 3a through which coherent light is emitted. .. The portable illumination device 1 can be used to illuminate an arbitrary illuminated surface IL in a three-dimensional space, and at least a part of the illumination pattern ILP that illuminates the illuminated surface IL can be switched as necessary. Here, the illumination pattern ILP is an illumination range of coherent light, and its location, shape, size, brightness, and hue are arbitrary. The illumination pattern ILP includes one that represents some information and one that is not informative but has a characteristic design. The illumination pattern ILP illuminated on the illuminated surface IL is not limited to one, and a plurality of illumination patterns ILP may be illuminated on the illuminated surface IL at the same time. In that case, the illumination position of each illumination pattern ILP is arbitrary, and different positions of the illuminated surface IL may be illuminated, or at least part of the illumination patterns ILP may overlap. Each illumination pattern ILP that illuminates the illuminated surface IL may include, for example, at least one of characters, pictures, color patterns, symbols, marks, illustrations, characters, and pictograms.

The portable lighting device 1 is assumed to be used by the user in various directions, and the illuminated surface IL is an arbitrary surface positioned in the direction in which the user points the portable lighting device 1. The surface may have irregularities or steps. More specifically, the irradiated surface IL is provided in any two-dimensional direction such as a floor surface, a wall surface, or a ceiling surface. The direction of the illumination pattern ILP on the illuminated surface IL changes according to the inclination angle or distance between the reference surface on which the user of the portable illumination device 1 is located and the illuminated surface IL, and the shape of the illumination pattern ILP is distorted. It can be done or the size can change.

As shown in FIG. 2, the portable lighting device 1 according to this embodiment includes a light source 4, a shaping optical system 5, and a diffractive optical element 6. Note that FIG. 2 shows an example of the internal configuration of the portable lighting device 1, and each member in the portable lighting device 1 and its arrangement can be variously changed.

The light source 4 is a laser light source that emits coherent light, that is, laser light. As the laser light source, various types of laser light sources such as a semiconductor laser can be used. Here, coherent light is light having a uniform phase and frequency, and its emission wavelength band is arbitrary and may be a visible light band.

The shaping optical system 5 shapes the coherent light emitted from the light source 4. Shaping means expanding the beam diameter of the coherent light emitted from the light source 4 to make it parallel, and is also called collimation. More specifically, the shaping optical system 5 has a first lens 5a for expanding the beam diameter of the coherent light emitted from the light source 4, and a second lens 5b for collimating the light passing through the first lens 5a. .. Even when the coherent light emitted from the light source 4 has a spread in the first place, the light may be passed through the first lens 5a and the second lens 5b to be collimated. In this case, the first lens 5a and the second lens 5b may perform optical control such as reduction of aberration.

The diffractive optical element 6 diffracts the coherent light shaped by the shaping optical system 5, that is, collimated. As shown in FIG. 1, the diffractive optical element 6 is arranged so as to face the opening 3a of the front end side end surface 1a of the housing 3. The diffractive optical element 6 has a plurality of diffractive portions capable of switching at least a part of the illumination pattern ILP that illuminates the illuminated surface IL. The diffractive optical element 6 may simultaneously illuminate the illuminated surface IL with two or more types of illumination patterns ILP, or may illuminate the illuminated surface IL with different illumination patterns ILP at different timings.

FIG. 3 is a plan view of the diffractive optical element 6 according to the present embodiment. The diffractive optical element 6 of FIG. 3 has four diffractive portions 6a to 6d. Of the four diffractive portions 6a to 6d, the diffractive portion 6a has, for example, an area that is approximately half the total diffractive area of the diffractive optical element 6, and each of the diffractive portions 6b to 6d has, for example, the total diffractive area of the diffractive optical element 6. It has an area of about 1/6. Note that FIG. 3 is an example of a plurality of diffractive portions, and the number of diffractive portions, arrangement location, area, and shape are arbitrary. The diffractive portions 6a to 6d may be formed of the same base material, the diffractive portion 6a and the diffractive portions 6b to 6d may be formed of different base materials, and the diffractive portions 6a to 6d are different from each other. It may be formed of a base material.

At least one of the plurality of diffractive sections 6a to 6d may be composed of a plurality of element diffractive sections 6e. FIG. 4 is a diagram showing an example in which the entire diffractive optical element 6 is composed of a plurality of element diffractive portions 6e. Each of the diffractive parts in FIG. 4 has a plurality of element diffractive parts 6e arranged vertically and horizontally. Each element diffractive part 6e in the diffractive parts 6a to 6d has a diffractive characteristic for displaying, for example, the same illumination pattern ILP on the illuminated surface IL. The respective element diffractive sections 6e are arranged at different positions in the corresponding diffractive sections, and the angles of the projected surface IL that are assumed in advance are different from each other. Has been formed. Since it is not realistic to manually design the diffraction of each element diffractive unit 6e, the diffraction design is performed by using, for example, the technique of computer generated hologram (CGH). Note that each of the plurality of element diffractive portions 6e may have an interference fringe that forms a part of the illumination pattern ILP formed by the corresponding diffractive portion.

In this embodiment, no other optical element or the like is interposed between the diffractive optical element 6 and the illuminated surface IL. Therefore, the diffracted light from the diffractive optical element 6 is directly incident on the illuminated surface IL. The diffracted light at each point on the diffractive optical element 6 is projected onto at least a part of the illuminated surface IL. That is, the diffracted light at each point on the diffractive optical element 6 travels within a predetermined diffusion angle range and is incident on at least a part of the illumination pattern ILP on the illuminated surface IL.

For designing the diffractive optical element 6, for example, an iterative Fourier transform method can be used. When the iterative Fourier transform method is used, the irradiation surface IL can be processed on the assumption that the irradiation surface IL is sufficiently far from the diffractive optical element 6, and the diffraction image on the irradiation surface IL can be a Fraunhofer diffraction image. Therefore, even if the normal direction of the illuminated surface IL is not parallel to the normal direction of the diffractive surface of the diffractive optical element 6, on the contrary, the normal direction of the illuminated surface IL is relative to the normal direction of the diffractive optical element 6. Even if it forms a large angle exceeding 45°, the light intensity can be made uniform over the entire illumination pattern ILP on the irradiated surface IL.

In the present embodiment, the coherent light is always emitted to the diffractive portion 6a, whereas the coherent light is emitted only to the diffractive portion selected from the diffractive portions 6b to 6d. A plurality of methods can be considered as a method of irradiating coherent light by selecting one from the diffractive sections 6b to 6d.

The first method is a method of allowing the diffractive sections 6b to 6d to slide and irradiating any one of the diffractive sections 6b to 6d with the coherent light shaped by the shaping optical system 5. In the first method, for example, a retracting unit that retracts at least a part of the plurality of diffracting units to a position where the coherent light shaped by the shaping optical system 5 is not irradiated is provided. The diffractive optical element 6 switches at least a part of the illumination pattern ILP of the irradiated surface IL by switching the diffractive section to be retracted by the retracting section. The retracting unit may have a slide mechanism that slides the plurality of diffraction units 6b to 6d in at least one direction. The diffractive optical element 6 switches at least a part of the illumination pattern ILP of the illuminated surface IL by switching the diffractive portion to which the coherent light shaped by the shaping optical system 5 is irradiated by the slide mechanism. By disposing the diffractive portion 6a which is always irradiated with the coherent light shaped by the shaping optical system 5 near the slide mechanism, the illumination pattern ILP diffracted by the diffractive portion selected by the slide mechanism and the diffractive portion 6a. The illuminated surface IL can be illuminated with the illumination pattern ILP diffracted by.

The second method is a method in which each of the diffractive sections 6b to 6d is made a detachable cassette type and any one diffractive section is attached. In the second method, an attaching/detaching portion for attaching/detaching the diffraction portions 6b to 6d is provided. The diffractive optical element 6 switches at least a part of the illumination pattern ILP of the illuminated surface IL by switching the diffractive section attached to the attachment/detachment section. The attachment/detachment portion is arranged at a place where the attached diffractive portion is irradiated with the coherent light shaped by the shaping optical system 5. By disposing the diffractive portion 6a which is always irradiated with the coherent light shaped by the shaping optical system 5 near the attachment/detachment portion, the illumination pattern ILP diffracted by the diffractive portion attached to the attachment/detachment portion and the diffractive portion 6a are arranged. The illuminated surface IL can be illuminated with the illumination pattern ILP diffracted by.

A third method is a method in which a light control member capable of switching transmission/blocking of coherent light is provided and the coherent light shaped by the shaping optical system 5 is irradiated to any of the diffractive sections 6b to 6d. .. The light control member is arranged between the diffractive portions 6 b to 6 d and the shaping optical system 5, and switches transmission or blocking of the coherent light shaped by the shaping optical system 5. The diffractive optical element 6 switches at least a part of the illumination pattern ILP of the illuminated surface IL by switching the diffractive portion that blocks coherent light with the light control member. By allowing the coherent light from the shaping optical system to directly enter the diffractive portion 6a, the illumination pattern ILP diffracted by the diffractive portion into which the coherent light transmitted through the light control member is incident, and the diffractive portion 6a. The illuminated surface IL can be illuminated with the illumination pattern ILP diffracted by.

A fourth method is to provide a plurality of light source units, provide a light shaping unit and a diffractive unit in association with each light source unit, and turn on the corresponding light source unit only for a desired diffractive unit. In the fourth method, the illumination control unit switches whether or not the coherent light emitted from the plurality of light source units is incident on the corresponding light shaping unit. Further, by separately providing a light source section corresponding to the diffractive section 6a and constantly turning on the light source section, the illumination pattern ILP diffracted by the diffractive section in which the light source section is ON among the diffractive sections 6b to 6d, The illuminated surface IL can be illuminated with the illumination pattern ILP diffracted by the portion 6a.

In the fifth method, the light source 4 and the shaping optical system 5 for the diffractive portions 6b to 6d are provided separately from the light source 4 and the shaping optical system 5 for the diffractive portion 6a, and the coherent light for the diffractive portions 6b to 6d is provided. Is a method of providing an optical scanning member for controlling the traveling direction of the beam, and irradiating only one of the diffractive portions 6b to 6d with the coherent light scanned by the optical scanning member. The optical scanning member controls the traveling direction of the coherent light shaped by the shaping optical system 5 so that at least a part of the diffractive portions 6b to 6d scans the coherent light. Further, the scan control unit switches the scanning range of the optical scanning member to switch at least a part of the illumination pattern ILP of the irradiation surface IL. These first to fifth techniques will be described in more detail in the second and subsequent embodiments described below.

As described above, the diffractive portion 6a is always irradiated with the coherent light, and one of the diffractive portions 6b to 6d is switched to emit the coherent light, so that the illuminated surface IL is simultaneously illuminated with the plurality of illumination patterns ILP. You can

The switching of the diffractive portions 6b to 6d can be performed by a physical switch, a button, a knob, or the like, which will be described in detail later in the second and subsequent embodiments.

FIG. 5A is a diagram showing an example of the illumination pattern ILP of the diffraction section 6a. In the diffractive portion 6a, for example, an illumination pattern ILP of an arrow indicating a direction is displayed. The direction of the arrow head and the size of the arrow are arbitrary.

FIG. 5B is a diagram showing an example of the illumination pattern ILP of the diffraction sections 6b to 6d. In the diffractive portions 6b to 6d, for example, an illumination pattern ILP representing information related to the arrow is displayed. More specifically, an illumination pattern ILP including characters indicating a place and pictograms indicating a place or a facility is displayed.

FIG. 5C is a diagram showing an example of an illumination mode of the illuminated surface IL by the diffractive optical element 6. The illumination pattern ILP of the diffractive portion 6a is always illuminated, and the illumination pattern ILP of the diffractive portions 6b to 6d is switched and illuminated, so that, for example, as shown in FIG. The illumination pattern ILP of information can be simultaneously displayed on the illuminated surface IL. This makes it possible, for example, to indicate the direction of the exit with an arrow, the direction of the pool with an arrow, and the like.

Next, the internal configuration of the portable lighting device 1 according to the present embodiment will be described in more detail with reference to FIG. Inside the portable lighting device 1, a substrate 7 on which the light source 4 is mounted, a control unit 8, and a battery 9 are provided. The control unit 8 may be mounted on the board 7 on which the light source 4 is mounted, or may be mounted on a separate board 7. The control unit 8 has the functions of the illumination control unit and the scanning control unit described above as necessary. When the light source 4 generates heat, a radiation fin is attached to the light source 4 as needed. The light source 4 is not limited to the coherent light source 4 that emits coherent light in one emission wavelength band, and as described later, a plurality of coherent light sources 4 that emit coherent light in the same emission wavelength band may be provided. A plurality of coherent light sources 4 that emit coherent light in different emission wavelength bands may be provided. When a plurality of coherent light sources 4 are provided, the shaping optical system 5 is provided for each coherent light source 4.

A signal indicating the switching state of the switch 2 provided on the housing 3 is input to the control unit 8. Further, the control unit 8 supplies the light source 4 with a signal for switching on/off of the light source 4. When any one of the plurality of diffractive sections included in the diffractive optical element 6 is electrically switched and used, the control section 8 sends a diffractive section switching signal to the diffractive optical element 6. Note that the control unit 8 may be implemented by being divided into a plurality of control units. For example, a control unit 8 may be provided in which a first control unit that performs on/off switching control of the light source 4 and a second control unit that performs switching control of a plurality of diffractive units are separately arranged.

Further, the LED light source 4 may be arranged on the rear end side end surface of the portable lighting device 1 according to the present embodiment so that it can be used as a general-purpose flashlight or lantern.

As described above, in the first embodiment, the diffractive optical element 6 is provided with the diffractive portion 6a to which the coherent light is always incident and the diffractive portions 6b to 6d that are switched and used as necessary. The illumination pattern ILP diffracted by 6a and the illumination pattern ILP diffracted by the diffractive portion selected from the diffractive portions 6b to 6d can simultaneously illuminate the illuminated surface IL. As a result, at least a part of the illumination pattern ILP illuminated on the illuminated surface IL can be switched as necessary, and the utility value of the portable illumination device 1 can be increased.

(Second embodiment)
6 is a diagram showing the internal configuration of the portable lighting device 1 according to the second embodiment, FIG. 7 is a plan view of the diffractive optical element 6 of the portable lighting device 1 of FIG. 6, and FIG. It is the perspective view which expanded the front end side end surface 1a vicinity. As shown in FIG. 7, the portable lighting device 1 according to the present embodiment includes a diffractive optical element 6 having three diffractive sections 6b to 6d. The three diffractive portions 6b to 6d in FIG. 7 have interference fringes for forming different illumination patterns ILP. At least one of the diffractive portions 6b to 6d may have element diffractive portions 6e, each of which is arranged vertically and horizontally.

As shown in FIG. 8, the portable illumination device 1 according to the present embodiment is a slide for sliding the diffractive optical element 6 arranged along the end face 1a of the coherent light in a predetermined direction (arrow direction in FIG. 8). It has a mechanism 11. By sliding the knob 12 in FIG. 8 in the direction of the arrow, the diffractive portion arranged in the opening 3a from which the coherent light from the shaping optical system 5 is emitted can be switched.

Thereby, the illumination pattern ILP of the illuminated surface IL can be switched depending on the position where the knob 12 is slid. The user of the portable illumination device 1 of FIG. 6 can illuminate the illuminated surface IL with different illumination patterns ILP by operating the knob 12 as necessary.

As shown in FIG. 9, the diffractive optical element 6 according to the first embodiment is arranged by arranging the diffractive portion 6a which is always irradiated with the coherent light from the shaping optical system 5 adjacent to the diffractive optical element 6 of FIG. You can use it in the same way as 6. In this case, the sizes of the diffractive portions 6a to 6d are adjusted according to the beam diameter of the coherent light from the shaping optical system 5 so that the coherent light is always incident on the diffractive portion and the diffractive portion 6a selected by the knob 12. There is a need to.

7 to 9 show the diffractive optical element 6 having three diffractive portions 6b to 6d, the number of slidable diffractive portions is arbitrary. Further, the sliding direction is not limited to the one-dimensional direction. For example, a plurality of switchable diffractive portions may be arranged in the two-dimensional direction, and the knob 12 that slides in the two-dimensional direction may be provided. This can increase the number of diffractive parts that can be switched. Further, what kind of illumination pattern is formed by moving the knob 12 in what direction may be displayed on the tip end face 1a of the portable lighting device 1 or the like with an illustration or characters.

As described above, in the portable illumination device 1 according to the second embodiment, the diffractive portions 6b to 6d forming at least a part of the diffractive optical element 6 are slid in a predetermined direction, and the coherent light from the shaping optical system 5 is emitted. Since it is possible to arbitrarily select the diffracting portion to be irradiated with, it is possible to easily and quickly switch the illumination pattern ILP for illuminating the irradiation surface IL as necessary.

(Third Embodiment)
FIG. 10 is an enlarged view of the vicinity of the front end side end surface 1a of the portable lighting device 1 according to the third embodiment. The portable illumination device 1 of FIG. 10 is provided with a slot mechanism 13 for attaching and detaching the cassette type diffractive optical element 6 so as to face the opening 3a of the end face 1a of the coherent light. The slot mechanism 13 has an attachment/detachment opening 13a into which the diffraction section is inserted and a takeout lever 13b.

In the present embodiment, a plurality of cassette-type diffractive portions 6b to 6d capable of generating different illumination patterns ILP are provided, and the diffractive optical element 6 is configured by the plurality of diffractive portions 6b to 6d. .. The user of the portable lighting device 1 of FIG. 10 inserts a diffractive portion capable of generating a desired illumination pattern ILP into the attachment/detachment opening 13 a of the slot mechanism 13 as needed. When taking out the diffractive portion which is inserted and mounted in the slot mechanism 13, the diffractive portion is taken out from the attaching/detaching port 13a by pushing the takeout lever 13b.

FIG. 11 is a diagram showing an internal configuration when the diffractive portion is inserted into the attachment/detachment opening 13 a of the slot mechanism 13. As shown in the figure, the coherent light shaped by the shaping optical system 5 is incident on the diffractive portion inserted in the slot mechanism 13 and diffracted, and the illumination pattern ILP corresponding to the interference fringes of the diffractive portion is applied to the illuminated surface IL. Is displayed.

Adjacent to the slot mechanism 13 of the present embodiment, the diffractive portion 6a, to which the coherent light from the shaping optical system 5 is always radiated, is used in the same manner as the diffractive optical element 6 according to the first embodiment. be able to. In this embodiment, coherent light is always incident on the diffractive part 6a, and the diffractive part capable of generating an arbitrary illumination pattern ILP is inserted into the slot mechanism 13 by replacing the cassette type diffractive parts 6b to 6d. You can Therefore, similarly to the first embodiment, it is possible to constantly illuminate the illuminated surface IL with the fixed illumination pattern ILP and simultaneously display another desired illumination pattern ILP on the illuminated surface IL.

As described above, in the third embodiment, the cassette type diffractive portion is replaced so that it can be inserted into the slot mechanism 13. Therefore, at least a part of the illumination pattern ILP for illuminating the irradiation surface IL can be easily switched. ..

(Fourth Embodiment)
FIG. 12 is a diagram showing the internal configuration of the portable lighting device 1 according to the fourth embodiment. The portable lighting device 1 of FIG. 12 includes a light control member 14 between the shaping optical system 5 and the diffractive optical element 6. The light control member 14 partially controls the transmittance of the coherent light shaped by the shaping optical system 5. The diffractive optical element 6 has a plurality of diffractive portions 6b to 6d capable of generating different illumination patterns ILP. Different interference fringes are formed in each diffraction portion. The number of diffractive portions in the diffractive optical element 6 is not particularly limited.

The light control member 14 individually controls whether or not the coherent light is made incident on each of the plurality of diffractive portions. The light control member 14 can be composed of, for example, a liquid crystal shutter or a polarizing element. In the case of a liquid crystal shutter, since the transmittance is changed by an electric signal, a dedicated switch is provided, and the voltage applied to the liquid crystal shutter can be switched to change the transmittance by operating this switch. The light control member 14 using a polarizing element switches the voltage to change the transmittance, or manually changes the transmittance. In the example of FIG. 12, the light control member 14 shows an example in which coherent light is made incident only on the diffractive portion 6c and the coherent light to the diffractive portion 6b and the diffractive portion 6d is blocked. The control unit 8 has a function of a transmittance control unit that controls the transmittance of the light control member 14. The transmittance control unit may be provided separately from the control unit 8.

By arranging the diffractive portion 6a, which is always irradiated with the coherent light from the shaping optical system 5, adjacent to the light control member 14 of FIG. 12, as shown in FIG. 13, the diffractive optical element according to the first embodiment. You can use it in the same way as 6. In this case, the coherent light is always incident on the diffractive part 6a, and the coherent light is incident on any of the diffractive parts 6b to 6d by the light control member 14, so that the illuminated surface IL is always fixed. While displaying the ILP, another illumination pattern ILP can be switched and displayed as necessary. In FIG. 13, the coherent light beams incident on the diffractive portions 6b to 6d are controlled by the light control member 14 and the coherent light beams from the shaping optical system 5 are directly incident on the diffractive portion 6a. Alternatively, the coherent light that has passed through the light control member 14 may be made incident, and the region of the light control member 14 corresponding to the diffractive portion 6a may always have a transmittance of 100%.

As described above, in the fourth embodiment, since the light control member 14 switches the coherent light beams incident on the plurality of diffractive portions 6b to 6d, the illumination pattern ILP displayed on the illuminated surface IL can be easily and quickly displayed. You can switch.

(Fifth Embodiment)
14A and 14B are diagrams showing the internal configuration of the portable lighting device 1 according to the fifth embodiment. The portable lighting device 1 of FIG. 14A includes an optical scanning member 15 that controls the traveling direction of the coherent light shaped by the shaping optical system 5. Further, the portable lighting device 1 of FIG. 14B includes an optical scanning member 15 that controls the traveling direction of the coherent light emitted from the light source 4. The diffractive optical element 6 has a plurality of diffractive portions 6b to 6d capable of generating different illumination patterns ILP. Different interference fringes are formed in each diffractive portion. The number of diffractive portions in the diffractive optical element 6 is not particularly limited.

The optical scanning member 15 in FIG. 14A controls the traveling direction of the coherent light from the shaping optical system 5 to irradiate any one of the diffractive parts 6b to 6d with the coherent light. As a result, the illumination pattern ILP corresponding to the diffractive portion on which the coherent light is incident is displayed on the illuminated surface IL. The optical scanning member 15 in FIG. 14B controls the traveling direction of the coherent light from the light source 4, and the controlled coherent light is incident on the shaping optical system 5. The first lens 5a in the shaping optical system 5 has a diameter within a range in which the optical scanning member 15 scans coherent light. The optical scanning member 15 in FIGS. 14A and 14B can be configured by a MEMS (Micro Electronic Mechanical Systems) mirror or the like. The controller 8 has a function of a scanning controller that controls scanning of the optical scanning member 15. The scan controller may be provided separately from the controller 8.

Similar to the diffractive optical element 6 according to the first embodiment, by arranging the diffractive portion 6a which is always irradiated with the coherent light from the shaping optical system 5 adjacent to the diffractive portions 6b to 6d in FIGS. 14A and 14B. Can be used. In this case, the coherent light is always incident on the diffractive portion 6a, and the coherent light is incident on any of the diffractive portions 6b to 6d by the optical scanning member 15, so that the illuminated surface IL is always fixed. While displaying the ILP, another illumination pattern ILP can be switched and displayed as necessary.

As described above, in the fifth embodiment, by controlling the optical scanning range of the optical scanning member 15, the coherent light incident on the plurality of diffractive portions 6b to 6d is switched, so that the light is displayed on the illuminated surface IL. The illumination pattern ILP can be switched easily and quickly.

(Sixth Embodiment)
FIG. 15 is a diagram showing the internal configuration of the portable lighting device 1 according to the sixth embodiment, and FIGS. 16(a) and 16(b) are plan views of the diffractive optical element 6 in the portable lighting device 1 of FIG. Is. The portable illumination device 1 of FIG. 15 includes a plurality of light sources 4, a plurality of shaping optical systems 5 that shapes the coherent light from each light source 4, and a plurality of coherent lights that are shaped by the plurality of shaping optical systems 5, respectively. And a diffractive optical element 6 for diffracting. Although two light sources 4 and two shaping optical systems 5 are provided in FIG. 15, the number of light sources 4 and shaping optical systems 5 may be two or more, and the numbers thereof are arbitrary.

As shown in FIGS. 16A and 16B, the diffractive optical element 6 has, for example, two diffractive sections 6b and 6c, and each diffractive section has coherent light from the corresponding shaping optical system 5. Is incident. The diffractive portions 6b and 6c have interference fringes capable of generating different illumination patterns ILP on the illuminated surface IL.

Each light source 4 can arbitrarily switch whether or not to emit coherent light. Therefore, only one of the two diffractive portions 6b and 6c can be irradiated with coherent light, and the illumination pattern ILP displayed on the irradiation surface IL can be switched. 16A shows an example in which the light source 4 corresponding to the diffraction section 6c is turned on and the light source 4 corresponding to the diffraction section 6b is turned off, and FIG. 16B shows the light source 4 corresponding to the diffraction section 6b being turned on. , An example in which the light source 4 corresponding to the diffraction section 6c is turned off. The control unit 8 has a function of an illumination control unit that controls lighting of each light source 4. The illumination control unit may be provided separately from the control unit 8.

The beam shape of the coherent light emitted from the light source 4 is ideally circular, but in reality, it is often an elongated elliptical shape. In this case, the beam shape of the coherent light that is shaped by the shaping optical system 5 and is incident on the diffractive portion also has an elliptical shape. Therefore, as shown in FIG. 17, by arranging the two light sources 4 and the shaping optical system 5 so that the major axes of the elliptical light beam 4a are parallel to each other, the two shaping optical systems 5 are provided. The beam shape of the coherent light incident on the diffractive optical element 6 can be approximated to a rectangle.

Instead of turning on/off the light source 4, the above-described light control member 14 and light scanning member 15 are provided between at least one of the shaping optical system 5 and the diffractive optical element 6 to provide coherent light to the corresponding diffractive portion. It may be controlled whether or not it is incident on.

According to the first embodiment, by arranging the diffractive portion 6a, which is always irradiated with the coherent light from the shaping optical system 5, adjacent to the diffractive portions 6b and 6c in FIGS. 16A and 16B. It can be used in the same manner as the diffractive optical element 6. In this case, the coherent light is always incident on the diffractive portion 6a, and the coherent light is incident on either the diffractive portion 6b or 6c by the ON/OFF control of the light source 4, so that the illuminated surface IL is always illuminated. While displaying the fixed illumination pattern ILP, another illumination pattern ILP can be switched and displayed as needed.

As described above, in the sixth embodiment, since the light source 4 and the shaping optical system 5 are provided so as to correspond to each of the plurality of diffractive portions in the diffractive optical element 6, for example, the on/off of the light source 4 is individually switched. By controlling, the illumination pattern ILP displayed on the illuminated surface IL can be switched.

(Seventh embodiment)
18A and 18B are diagrams showing the internal configuration of the portable lighting device 1 according to the seventh embodiment, and FIGS. 19A and 19B are plan views of the diffractive optical element 6. is there. The portable lighting device 1 according to the present embodiment includes a first optical structure 16 and a second optical structure 17.

The first optical structure 16 houses the light source 4 and the shaping optical system 5, and has a first end face 16 a for emitting the coherent light shaped by the shaping optical system 5.

The second optical structure 17 houses the first optical structure 16 and has the diffractive optical element 6 arranged on the second end face 17a. The second optical structure 17 guides the coherent light emitted from the first end face 16 a of the first optical structure 16 to the diffractive optical element 6. The second optical structure 17 supports the first optical structure 16 such that the orientation of the first optical structure 16 remains unchanged even if the second optical structure 17 is moved in a predetermined direction. It has a section 18.

The first optical structure 16 and the second optical structure 17 have a tubular shape, and their outer shapes may be cylindrical or prismatic.

The diffractive optical element 6 has, for example, two diffractive portions 6b and 6c. These diffractive portions 6b and 6c display different illumination patterns ILP on the illuminated surface IL. The number of diffractive portions forming the diffractive optical element 6 may be three or more.

FIG. 18A shows an example in which the second optical structure 17 is oriented in the direction of arrow A shown in the figure. In this case, since the orientation of the first optical structure 16 inside the second optical structure 17 does not change, the coherent light from the shaping optical system 5 of the first optical structure 16 is, for example, as shown in FIG. Then, the light is incident on the diffractive portion 6c. Therefore, the illumination pattern ILP of the diffraction section 6c is displayed on the illuminated surface IL.

FIG. 18B shows an example in which the second optical structure 17 is oriented in the direction of the arrow B shown. In this case, since the orientation of the first optical structure 16 inside the second optical structure 17 does not change, the coherent light from the shaping optical system 5 of the first optical structure 16 is, for example, as shown in FIG. Thus, the light is incident on the diffractive portion 6b. Therefore, the illumination pattern ILP of the diffraction section 6b is displayed on the illuminated surface IL.

As described above, in the seventh embodiment, the first optical structure 16 whose orientation does not change even if the orientation of the second optical structure 17 is changed is housed inside the second optical structure 17, so The type of the illumination pattern ILP displayed on the illuminated surface IL can be switched simply by changing the direction of the optical structure 17. The user does not need to operate a switch or the like when switching the illumination pattern ILP of the illuminated surface IL, and only needs to change the direction of the portable illumination device 1, which improves usability.

In the above-described first to seventh embodiments, the example in which the irradiation target surface IL is illuminated with a single color by using the coherent light in the single wavelength band has been described, but the irradiation by the coherent light in the plurality of wavelength bands is performed. The surface IL may be illuminated in color. In this case, as shown in FIG. 20, for example, three light sources 4 (4A to 4C), three shaping optical systems 5 (5aA to 5aC, 5bA to 5bC), and three diffractive optical elements 6 (6A to 6C). And should be provided. The three light sources 4 in FIG. 20 emit coherent light in different wavelength bands. Typically, three light sources 4 that emit coherent light in three wavelength bands of red, green, and blue (or their complementary colors) are provided. It is necessary to provide the shaping optical system 5 and the diffractive optical element 6 for each light source 4. Each of the three diffractive optical elements 6 has a plurality of diffractive portions capable of switching the illumination pattern ILP that illuminates the illuminated surface IL.

The portable lighting device 1 according to the above-described first to seventh embodiments has a size that can be easily gripped by a person, and can be used for various purposes. For example, a guide member who guides a visitor to a specific place displays an illumination pattern ILP indicating the direction of the specific place and an illumination pattern ILP indicating information indicating the specific place on a floor surface, a wall surface, a ceiling surface, or the like. It can be used for the purpose.

Alternatively, the purpose of a traffic maintenance worker who guides a route with a traffic restriction due to road construction or an accident to display an illumination pattern ILP indicating the direction of the traffic route and an illumination pattern ILP explaining the content of the traffic restriction on the road surface. Can be used at.

In addition, the portable lighting device 1 according to the first to seventh embodiments is applicable when it is necessary to switch the illumination pattern ILP as necessary. In particular, since the portable lighting device 1 described above illuminates coherent light, it is possible to perform clear illumination to a far distance as compared with the case where the light source 4 is an LED or the like. By taking advantage of such characteristics of using coherent light, it is possible to provide an illuminating device which has never been available.

The diffractive optical element 6 may be divided into a plurality of element diffractive portions 6e. In this case, each element diffractive section 6e may display the entire predetermined information or may display a part of the predetermined information.

By designing the diffraction characteristics of the diffractive optical element 6 so that each element diffractive section 6e of the diffractive optical element 6 correctly illuminates each illumination range in the illuminated surface IL6 corresponding to each element diffractive section 6e, It is possible to suppress blurring of the predetermined information displayed in the irradiation surface IL6.

(Eighth Embodiment)
FIG. 21 is a diagram showing the internal configuration of the portable lighting device according to the eighth embodiment. As shown in FIG. 21, the portable lighting device 1 may be liquid-proofed, especially waterproofed. In the example shown in FIG. 21, the portable lighting device 1 has a liquid-proof member 100. The liquid-proof member 100 is provided inside the housing 3. Particularly in the illustrated example, the liquid-proof member 100 is provided inside the housing 3 in the vicinity of the opening 3 a. In other words, the light source 4, the control unit 8 and the battery 9 are arranged in the area surrounded by the housing 3 and the liquid-proof member 100.

The liquid-proof member 100 is provided on the path of coherent light. Therefore, the liquid-proof member 100 is preferably transparent so as not to block coherent light. Such a liquid-proof member 100 can be, for example, a plate material made of resin such as acrylic or glass. The liquid-proof member 100 is held by the housing 3 around the liquid-proof member 100. A pressure-sensitive adhesive or an adhesive may be provided between the liquid-proof member 100 and the housing 3 to stably prevent the liquid from entering.

FIG. 22 is a diagram showing the internal configuration of the portable lighting device according to the modification of the eighth embodiment. Further, as shown in FIG. 22, also in the portable lighting device 1 including the light control member 14 between the shaping optical system 5 and the diffractive optical element 6 as described above, the vicinity of the opening 3 a inside the housing 3 is provided. That is, the liquid-proof member 100 may be provided between the opening 3 a and the light control member 14.

According to the eighth embodiment, even if the liquid enters the housing 3 through the gap between the opening 3 a and the diffractive optical element 6, the liquid-proof member 100 covers the inside of the housing 3 to prevent the liquid from entering. Ingress of liquid, especially water, into the part can be effectively prevented. That is, the liquid-proof member 100 seals the internal space of the housing 3 in which the light source 4 is housed. As a result, the liquid-proof member 100 can effectively prevent the liquid, especially the moisture, from adhering to the components such as the light source 4, the control unit 8 and the battery 9, and as a result, it is included in the portable lighting device 1. It is possible to effectively prevent a malfunction such as a short circuit from occurring in the electrical system.

(Ninth Embodiment)
FIG. 23 is a diagram showing the internal configuration of the portable lighting device according to the ninth embodiment. As shown in FIG. 23, the housing 3 may have a first portion 3A that houses the light source 4 and a second portion 3B that is detachable from the tip of the first portion 3A. The first portion 3A is configured as a tubular member having an opening at one end on the second portion 3B side. On the other hand, the second portion 3B is configured as a tubular member having open ends. The first portion 3A and the second portion 3B can be detachably connected via a fixing structure 3C for fixing each other. In the illustrated example, the second portion 3B is removably attached to the first portion 3A by the fixing structure 3C constituted by the female screw of the first portion 3A and the male screw of the second portion 3B. Unlike FIG. 23, a male screw may be provided on the first portion 3A and a female screw may be provided on the second portion 3B as a fixed structure. Further, a liquid-proof packing may be arranged between the base end portion of the female screw and the tip end portion of the male screw.

As shown in FIG. 23, the liquid-proof member 100 described above is provided in the second portion 3B. In this example, the relief type diffractive optical element 6 may be held by the second portion 3B, and the uneven surface of the diffractive optical element 6 may face the inner side of the second portion 3B. At this time, even if the liquid enters from the gap of the fixing structure 3C or from the opening side of the second portion 3B removed from the first portion 3A, the second portion 3B causes the liquid to enter inside the second portion 3B. It is possible to effectively prevent liquid, especially water, from adhering to the held diffractive optical element 6.

In particular, the diffractive optical element configured as a relief type hologram causes a diffraction phenomenon by utilizing the uneven surface. When the liquid comes into contact with the uneven surface, the difference in the refractive index on the uneven surface changes, and the expected diffraction phenomenon cannot be obtained by the diffractive optical element 6. Therefore, the relief-type diffractive optical element 6 is supported by the second portion 3B so that the uneven surface faces the inner side of the second portion 3B, and the liquid-proof member 100 allows the inner portion of the second portion 3B to be supported. By covering the above, it becomes possible to stably secure the expected diffraction phenomenon.

In the example shown in FIG. 23, the second liquid-proof member is provided on the first portion 3A so as to cover the inside of the first portion 3A in the vicinity of the opening of the first portion 3A, that is, in the vicinity of the fixing structure 3C. 101 is provided. In other words, the light source 4, the controller 8 and the battery 9 are arranged in the area surrounded by the first portion 3A and the second liquid-proof member 101. In order to ensure translucency of coherent light, the second liquid-proof member 101 can be, for example, a plate material made of resin such as acrylic or glass. According to the second liquid-proof member 101, even if liquid enters from the gap of the fixing structure 3C or from the opening side of the first portion 3A with the second portion 3B removed, the inner portion of the first portion 3A It is possible to effectively prevent the intrusion of liquid, especially water into the. This makes it possible to effectively prevent the liquid, especially the moisture, from adhering to the components such as the light source 4, the control unit 8 and the battery 9, by the second liquid-proof member 101, and as a result, the portable lighting device 1 It is possible to effectively prevent a defect such as a short circuit from occurring in the electric system included in the.

Aspects of the present disclosure are not limited to the individual embodiments described above, and 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 gist of the present disclosure derived from the contents defined in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Portable illuminating device, 1a Tip side end surface, 2 switch, 3 case, 3a opening part, 4 light source, 5 shaping optical system, 6 diffractive optical element, 6a-6d diffractive part, 6e element diffractive part, 7 substrate, 8 Control unit, 9 battery, 11 slide mechanism, 12 knob, 13 slot mechanism, 13a attaching/detaching port, 13b take-out lever, 14 light control member, 15 light scanning member, 16 first optical structure, 17 second optical structure, 18 Support section

Claims (15)

A light source that emits coherent light,
A shaping optical system that shapes the coherent light emitted from the light source,
A diffractive optical element for diffracting the coherent light shaped by the shaping optical system,
The diffractive optical element has a plurality of diffractive sections capable of switching an illumination pattern for illuminating a surface to be illuminated,
The portable illuminating device, wherein the diffractive optical element illuminates the illuminated surface with two or more types of illumination patterns simultaneously, or illuminates the illuminated surface with different illumination patterns at different timings. Coherent light shaped by the shaping optical system is constantly irradiated to a part of the plurality of diffractive portions,
The diffractive optical element can switch whether or not to irradiate the coherent light shaped by the shaping optical system to the remaining diffractive portions other than the some diffractive portions of the plurality of diffractive portions. ,
The diffractive optical element is an illumination pattern diffracted by the part of the diffractive part, and an illumination pattern diffracted by a diffractive part of the remaining diffractive part which is irradiated with coherent light shaped by the shaping optical system. The portable lighting device according to claim 1, wherein the illuminated surface is illuminated with a light source. At least a part of the plurality of diffractive parts is provided with a retreating part that retreats to a position where the coherent light shaped by the shaping optical system is not irradiated.
The portable illumination device according to claim 1 or 2, wherein the diffractive optical element switches at least a part of an illumination pattern on the illuminated surface by switching a diffractive unit to be retracted by the retracting unit. The retracting unit has a slide mechanism that slides two or more diffractive parts of the plurality of diffractive parts in at least one direction,
4. The diffractive optical element switches at least a part of an illumination pattern of the illuminated surface by switching a diffractive portion on which the coherent light shaped by the shaping optical system is emitted by the slide mechanism. The portable lighting device described. A detachable portion for attaching and detaching at least a part of the plurality of diffractive portions,
The portable lighting device according to claim 1 or 2, wherein the diffractive optical element switches at least a part of an illumination pattern on the illuminated surface by switching a diffractive portion mounted on the attachment/detachment portion. The attachment/detachment portion is arranged at a place where the attached diffractive portion is irradiated with coherent light shaped by the shaping optical system,
The portable illumination device according to claim 5, wherein the coherent light diffracted by the diffractive unit attached to the attachment/detachment unit illuminates the illuminated surface with an illumination pattern corresponding to the attached diffractive unit. The attaching/detaching portion attaches/detaches a part of the plurality of diffracting portions,
Of the plurality of diffractive parts, the remaining diffractive parts other than the part of the diffractive parts are always irradiated with coherent light shaped by the shaping optical system,
The diffractive optical element illuminates the irradiation target surface with an illumination pattern diffracted by a diffractive section attached to the detachable section and an illumination pattern diffracted by the remaining diffractive section. The portable lighting device described. A light control member that is disposed between at least a part of the plurality of diffractive portions and the shaping optical system and that switches transmission or blocking of coherent light shaped by the shaping optical system,
The portable lighting device according to claim 1, wherein the diffractive optical element switches at least a part of an illumination pattern of the illuminated surface by switching a diffractive portion that blocks coherent light by the light control member. .. A scanning member that scans coherent light by at least a part of the plurality of diffractive portions by controlling the traveling direction of the coherent light shaped by the shaping optical system or the coherent light before being incident on the shaping optical system. When,
The portable lighting device according to claim 1, further comprising: a scan control unit that switches a scanning range of the scanning member so that at least a part of an illumination pattern on the illuminated surface can be switched. The light source has a plurality of light source units each emitting coherent light,
The shaping optical system is provided corresponding to each of the plurality of light source units, and has a plurality of light shaping units that shape coherent light emitted from the corresponding light source units,
Coherent light shaped by a corresponding light shaping unit is incident on each of the plurality of diffractive units,
The portable lighting device according to claim 1 or 2, wherein the plurality of light source units can switch whether or not coherent light is incident on the corresponding light shaping unit. The light source has a plurality of light source units each emitting coherent light,
The shaping optical system is provided corresponding to each of the plurality of light source units, and has a plurality of light shaping units that shape coherent light emitted from the corresponding light source units,
Coherent light shaped by the corresponding light shaping unit is incident on each of the plurality of diffractive units,
The portable lighting device according to claim 1, further comprising an illumination control unit that switches whether or not the coherent light emitted from the plurality of light source units is incident on the corresponding light shaping unit. A first optical structure having a first end face that houses the light source and the shaping optical system, and emits coherent light shaped by the shaping optical system;
A second optical structure that houses the first optical structure and has the diffractive optical element disposed on a second end face, and guides coherent light emitted from the first end face to the diffractive optical element. And
The second optical structure has a support portion that supports the first optical structure such that the orientation of the first optical structure remains unchanged even if the orientation of the second optical structure is changed,
By changing the direction of the second optical structure, the incident position of the coherent light emitted from the first end face of the second optical structure on the second end face is changed to illuminate the illuminated surface. The portable lighting device according to claim 1, wherein at least a part of the pattern is switched. At least one of the plurality of diffractive portions has a plurality of element diffractive portions arranged in the two-dimensional direction,
The each of the plurality of element diffractive sections has an interference fringe for forming at least a part of an illumination pattern in which the corresponding diffractive section illuminates the illuminated surface. Portable lighting device. The illumination pattern in which the plurality of diffractive portions illuminate the illuminated surface includes at least one of a character, a pattern, a color pattern, a symbol, a mark, an illustration, a character, and a pictogram. The portable lighting device described. The plurality of diffractive sections has a diffractive section that generates an illumination pattern that represents a direction, and a diffractive section that generates an illumination pattern that represents information related to the direction,
The said diffractive optical element illuminates the said to-be-irradiated surface so that the illumination pattern showing a direction and the illumination pattern showing the information relevant to a direction may be simultaneously displayed. Portable lighting device.