WO2017061119A1 - 光学部材およびマイクロレンズアレイ - Google Patents
光学部材およびマイクロレンズアレイ Download PDFInfo
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- WO2017061119A1 WO2017061119A1 PCT/JP2016/004499 JP2016004499W WO2017061119A1 WO 2017061119 A1 WO2017061119 A1 WO 2017061119A1 JP 2016004499 W JP2016004499 W JP 2016004499W WO 2017061119 A1 WO2017061119 A1 WO 2017061119A1
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- WIPO (PCT)
- Prior art keywords
- light
- incident
- wavelength
- phosphor layer
- optical member
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Definitions
- the present invention relates to an optical member and a microlens array.
- white light is produced by irradiating the phosphor with blue light emitted from an LED or a laser.
- the phosphor produces white light by scattering light such as emitted blue light and yellow light excited by blue light.
- White light emitted from the phosphor is controlled by a combination of a collimator lens and a condenser lens.
- Patent Document 1 a technique capable of suppressing such loss light is disclosed (for example, Patent Document 1).
- Patent Document 1 by arranging an optical member provided with a lens array using microlenses or microprisms on a fluorescent substance, high-angle white light emitted from the fluorescent substance is incident on a condensing lens (projection lens) It can be done.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical member and a microlens array capable of further increasing the light collection efficiency of light emitted from a phosphor.
- an optical member includes a phosphor layer including a phosphor for wavelength-converting a part of light from a light source incident on an incident surface, and a wavelength of the phosphor layer
- a diffraction-type microlens array that emits a part of the converted light and the other part of the light transmitted through the phosphor layer from a light-emitting surface, and the light-emitting surface of the microlens array is subjected to wavelength conversion
- a plurality of diffractive lenses are provided for diffracting and transmitting the part of the light and the other part of the transmitted light, and the pitch of the plurality of diffractive lenses differs in each predetermined area.
- the microlens array according to one aspect of the present invention is wavelength-converted by a phosphor layer including a phosphor that wavelength-converts a part of light from a light source incident on an incident surface.
- a diffraction-type microlens array that emits a part of the light and the other part of the light transmitted through the phosphor layer from an emission surface, and the emission surface includes one of the wavelength-converted light
- a plurality of diffractive lenses are provided for diffracting and transmitting the portion and the other portion of the transmitted light, and the pitches of the plurality of diffractive lenses are different for each predetermined area.
- the light collection efficiency of the light emitted from the phosphor can be increased.
- the collection efficiency of the light emitted from the phosphor can be increased.
- FIG. 1 is a view showing an example of an apparatus in which the optical member in the embodiment is used.
- FIG. 2 is a diagram showing an example of the light source unit in the embodiment.
- FIG. 3 is an example of sectional drawing of the optical member in embodiment.
- FIG. 4 is a top view of the optical member shown in FIG.
- FIG. 5 is a cross-sectional view of the optical member in the embodiment.
- FIG. 6 is a diagram for explaining a simulation model in the first embodiment.
- FIG. 7 is a diagram showing simulation results in the first embodiment.
- FIG. 8 is a diagram schematically showing the simulation result in the first comparative example.
- FIG. 9 is a diagram showing simulation results in the second embodiment.
- FIG. 10 is a diagram for explaining a simulation model in the third embodiment.
- FIG. 11 is a diagram showing simulation results in the third embodiment.
- FIG. 12 is an example of a cross-sectional view of an optical member in a modification.
- FIG. 13 is an example of sectional drawing of the optical member in a modification.
- FIG. 14 is an example of a cross-sectional view of an optical member in a modification.
- FIG. 1 is a figure which shows an example of the illuminating device 4 in which the optical member 10 in embodiment is used.
- FIG. 2 is a diagram showing an example of the light source unit 1 in the embodiment.
- FIG. 3 is an example of sectional drawing of the optical member 10 in embodiment.
- FIG. 4 is an example of a top view of the optical member 10 shown in FIG.
- the illumination device 4 illustrated in FIG. 1 is, for example, an endoscope, a fiberscope, or the like, and includes a light source unit 1, an optical fiber 2, and a lamp 3.
- the optical fiber 2 is a transmission path that transmits light to a distant place.
- the optical fiber 2 is, for example, a wire having a diameter of about 125 ⁇ m, and has a double structure in which a core having a high refractive index of 100 ⁇ m in diameter is surrounded by a cladding layer having a lower refractive index than the core having a diameter of 110 ⁇ m.
- the core and cladding layers are both made of quartz glass or plastic, which has a very high transmittance to light.
- the lamp 3 is used to irradiate the light from the light source unit 1 transmitted through the optical fiber 2 to the observation target.
- the lamp 3 is constituted of, for example, a stainless steel fiber coupling, a stainless steel ferrule, a glass lens, an aluminum holder, and an aluminum outer shell.
- the light source unit 1 is an illumination using an LED or a laser, and injects light into the optical fiber 2.
- the light source part 1 is comprised by the optical member 10 and the light source 16 as shown in FIG.
- the light source 16 is an LED or a laser, and emits blue light having a diameter of about 1 mm in this embodiment.
- the optical member 10 includes a phosphor layer 11 and a microlens array 12 as will be described in detail later, as shown in FIG. 2, and produces white light from blue light emitted from the light source 16 to light the produced white light. It enters the fiber 2.
- the microlens array 12 is a diffraction-type microlens array that emits a part of the light wavelength-converted by the phosphor layer 11 and the other part of the light transmitted through the phosphor layer 11 from the exit surface.
- the microlens array 12 includes the base 13 and the diffractive lens array 14.
- the phosphor layer 11 includes a phosphor that wavelength-converts a part of the light from the light source 16 incident on the incident surface 111.
- the light source 16 emits blue light
- the phosphor layer 11 wavelength-converts part of the blue light into a wavelength band indicating yellow.
- the phosphor layer 11 has a function of wavelength converting a part of light incident from the incident surface 111 shown in FIG.
- blue light is incident from the light source 16 and the phosphor layer 11 emits yellow light excited by a part of the incident blue light. Further, the phosphor layer 11 emits (transmits) the other part of the incident blue light. In the phosphor layer 11, the blue light and the yellow light are mixed and emitted, so the phosphor layer 11 emits white light.
- the phosphor layer 11 is formed, for example, in a disk shape having a diameter of about 1 mm.
- the phosphor layer 11 is made of a phosphor and a resin, and is formed, for example, by covering the phosphor with a resin such as silicon or epoxy.
- the thermal radiation of the fluorescent substance layer 11 is very important.
- the phosphor layer 11 be supported by a heat dissipation plate formed of a material having high thermal conductivity such as, for example, Al.
- the heat dissipation may be enhanced by mixing a material having high thermal conductivity, such as an inorganic oxide such as ZnO, with the resin forming the phosphor layer 11.
- a minute structure may be provided on the incident surface 111 of the phosphor layer 11 so that light may be easily incident on the phosphor layer 11 or may be easily dissipated from the incident surface 111.
- the substrate 13 is a substrate of the microlens array 12.
- the base material 13 is formed on the phosphor layer 11 in the shape of a disc having a diameter of, for example, about 1 mm.
- the diffractive lens array 14 is formed on the base material 13.
- a material which forms the base material 13 arbitrary materials, such as glass and a plastics, can be used, for example.
- glass for example, soda glass, non-alkali glass and the like can be used.
- plastic for example, polycarbonate, polyethylene terephthalate (PET), polyethylene naphthalate (PEN) and the like can be used.
- the material of the substrate 13 needs to be selected in consideration of heat resistance as described for the phosphor layer 11. Furthermore, it is preferable that the base material 13 is formed with the material of the refractive index comparable as the fluorescent substance layer 11 so that the light from the fluorescent substance layer 11 may enter easily.
- the same degree of refractive index means that the difference in refractive index between them is ⁇ 0.2 or less.
- the phosphor layer 11 and the base material 13 be bonded by an adhesive layer having a refractive index similar to both of them.
- An acrylic resin, an epoxy resin, etc. are mentioned as a material of a contact bonding layer.
- the base 13 and the adhesive layer are preferably transparent without light absorption, and are preferably formed of a material having an extinction coefficient of substantially zero.
- the diffractive lens array 14 is an example of a plurality of diffractive lenses provided on the exit surface of the microlens array 12 as shown in FIG. 3, for example.
- the diffractive lens array 14 emits a part of the light whose wavelength is converted by the phosphor layer 11 and the other part of the light transmitted through the phosphor layer 11 from the exit surface.
- the pitch of the diffractive lens array 14 is different for each predetermined zone. Further, the pitch of the diffractive lens array 14 is narrowed from the center to the periphery of the diffractive lens array 14.
- the center of the diffractive lens array 14 is indicated by the intersection of the X axis and the Y axis.
- the direction from the center to the periphery of the diffractive lens array 14 is shown from the X-axis to the Y-axis in a direction away from the X-axis.
- the diffractive lens array 14 is provided concentrically on the exit surface, and for example, as shown in FIG. 3, the cross section of the diffractive lens on a plane perpendicular to the exit surface. Is described as being serrated.
- FIG. 5 is a view showing the state of diffraction of light incident on the microlens array 12 in the present embodiment.
- five areas area 1, area 2, area 3, area 4 and area 5
- concentric circles excluding the central area where the diffractive lens is not provided are shown as an example of the predetermined area.
- the diffractive lens array 14 (a plurality of diffractive lenses) diffracts the blue light of the light source 16 and the yellow light whose blue light is wavelength-converted by the phosphor layer 11 and determines predetermined regions It is provided so that it may condense in the condensing area
- region 15 which is.
- the pitch of the diffractive lens array 14 diffracts a part of the wavelength-converted light or the other part of the light and condenses it on a predetermined area (light collecting area 15) As such, it is provided constantly in each predetermined area.
- the pitch of the diffractive lens array 14 is constant in each of the areas 1 to 5.
- the pitch of the diffractive lens array 14 is narrower as the area (zone) from the center to the periphery of the diffractive lens array 14, such as the area 2 than the area 1 and the area 3 than the area 2.
- the diffractive lens array 14 diffracts the blue light transmitted through the phosphor layer 11 and the yellow light which is wavelength-converted by the phosphor layer 11, that is, white light, and condenses the light in the light collecting region 15.
- the diffractive lens array 14 diffracts the blue light transmitted through the phosphor layer 11 and the yellow light which is wavelength-converted by the phosphor layer 11, that is, white light, and condenses the light in the light collecting region 15.
- the pitch of the plurality of diffraction lenses in a partial area of a predetermined area is a predetermined area (collector) by diffracting the other part of the light indicating the wavelength band of the light source 16
- the pitch of the plurality of diffractive lenses in the area of the remaining portion of the predetermined area is a wavelength that is constant in each of the partial areas so as to condense in the light region 15). It is good also as fixedly provided in each area of the said remainder so that one part of the converted said light may be diffracted and it condenses on the predetermined area
- region light collection area
- the diffractive lens array 14 diffracts the blue light transmitted through the phosphor layer 11 and the yellow light obtained by wavelength-converting blue light by the phosphor layer 11, that is, white light, and collects the light.
- the light can be collected in the area 15.
- Diffractive lens array 14 a plurality of diffractive lenses each emission angle theta 2 which constitute the, the incident angle theta 1, wavelength lambda, the pitch d, by using parameters such as the refractive index n 1 of the microlens array, as an expression of diffraction It can be calculated by the following equation 1 which is known.
- Equation 1 m is a diffraction order and is a positive or negative integer.
- n 2 is a refractive index of a region emitted from the plurality of diffractive lenses, and is 1 here because it is air.
- the incident angle theta 1 and the condensing area is the angle of light incident to each of the plurality of diffractive lens shown in FIG. 5 it is possible to determine the emission angle theta 2 from the geometric positional relationship between the 15.
- the pitch d can be calculated using the above equation 1.
- the area 1 in the diffractive lens array 14 is determined by determining the emission angle ⁇ 2 from the geometrical positional relationship between the incident angle ⁇ 1 and the light collecting region 15 in each of the area 1 to the area 5.
- the pitch d of each of the sections 5 can be calculated.
- the pitch d can be calculated to be, for example, 0.2 ⁇ m to 20 ⁇ m as a range in which the light can be condensed on the condensing region 15 by diffraction.
- the material of the diffractive lens array 14 is selected according to the method of forming the diffractive lens array 14, heat resistance, and refractive index.
- Examples of the method of forming the diffractive lens array 14 include nanoimprinting, printing, photolithography, EB lithography, and particle orientation.
- the material of the diffractive lens array 14 is selected from epoxy resin and acrylic resin as UV curing resin, and polymethyl methacrylate (PMMA) as thermoplastic resin. do it.
- the material of the diffractive lens array 14 may be glass or quartz in consideration of heat resistance, and the diffractive lens array 14 may be formed by photolithography or EB lithography.
- the diffractive lens array 14 is preferably formed of a material having a refractive index similar to that of the substrate 13 so that light from the substrate 13 can easily enter. Further, like the base 13, the diffractive lens array 14 preferably has no absorption of light and is transparent, and is preferably made of a material having an extinction coefficient of substantially zero.
- optical simulation of optical member In order to confirm the effect of the optical member 10 configured as described above, an optical simulation was performed by changing the pitch of the diffractive lens array 14 for each predetermined area (zone). It demonstrates below as an Example. Parameters for determining the light collection efficiency (diffraction efficiency) of the diffractive lens array 14 (microlens array 12) include the height, cross-sectional shape, etc. of the diffractive lens array 14 (microlens array 12). The light collection efficiency can be known by performing optical simulation without actually forming the microlens array 12.
- FIG. 6 is a diagram for explaining a simulation model in the first embodiment.
- FIG. 7 is a diagram showing simulation results in the first embodiment.
- FIG. 8 is a diagram schematically showing the simulation result in the first comparative example.
- FIG. 6 shows a simulation model in which the optical member 10 shown in FIG. 5 is modeled.
- the microlens array 12 is disposed on the phosphor layer 11, and the light collecting region 15 is disposed at a predetermined distance from the microlens array 12.
- the incident light 101 to the incident light 110 respectively model incident light incident on the area (zone in the drawing) of the diffractive lens array 14 at an incident angle of 0 °.
- the incident light 101 and the incident light 106 are models of incident light incident on the zone 1 of the diffractive lens array 14, and the incident light 102 and the incident light 107 are incident on the zone 2 of the diffractive lens array 14.
- incident light 103 and incident light 108 are models of incident light that enters zone 3 of diffractive lens array 14.
- incident light 104 and incident light 109 are models of incident light incident on zone 4 of diffractive lens array 14, and incident light 105 and incident light 110 are incident on zone 5 of diffractive lens array 14. It is a model of incident light.
- the outgoing angle that is, each incident light 101 to the incident light 110
- the angle of light emitted to the light is calculated, and the diffraction efficiency of the diffractive lens array 14 having a pitch designed to have the calculated output angle is simulated.
- the simulation method is the RCWA method
- the simulation software is an optical simulation using the following parameters using a diffractive optical element design and analysis software DiffractMOD (Synopsis).
- the incident angle of incident light 101 to incident light 110 is 0 deg, incident wavelength 450 nm, refractive index of diffractive lens array 14 is 1.5, extinction coefficient is 0, diameter of light collecting region 15 is 100 ⁇ m, and diffractive type
- the distance between the lens array 14 and the focusing area 15 is 5.54 mm.
- the pitch d 2 of the diffractive lens array 14 in 2 is set to 12.4 ⁇ m according to Equation 1.
- the pitch d 3 of the diffractive lens array 14 at 3 is 8.3 ⁇ m according to Equation 1.
- the pitch d 4 of the diffractive lens array 14 at 4 is set to 6.2 ⁇ m.
- the pitch d 5 of the diffractive lens array 14 at 5 is 5 ⁇ m according to Equation 1.
- the pitch of the microlens array 92 of Comparative Example 1 is 5 ⁇ m regardless of the positions of the incident light 101 to the incident light 110.
- the heights of the microlens array 12 of this example and the microlens array of the comparative example were changed by 0.2 ⁇ m to 10 ⁇ m, and the one with the highest diffraction efficiency was selected.
- the condensing efficiency 4.54 of the microlens array 12 of Example 1 shown in FIG. 7 is a relative value when the condensing efficiency of the microlens array of Comparative Example 1 is 1. From the simulation results shown in FIG. 7, it can be seen that the light collection efficiency of the microlens array 12 of Example 1 is higher than the light collection efficiency of the microlens array of Comparative Example 1.
- the pitch of the diffractive lens array 94 is constant. Therefore, the light emitted from the phosphor layer 11 can not be sufficiently condensed on the condensing region 15.
- the pitch of the diffractive lens array 14 is made different for each predetermined area (zone 1 to zone 5), the light emitted from the phosphor layer 11 is condensed.
- the area 15 can be sufficiently focused.
- Example 2 In Example 1, although it showed about the incident wavelength 450 nm, ie, the simulation result at the time of designing blue light of the light source 16 which permeate
- a simulation result in the case where an incident wavelength of 550 nm, that is, yellow light wavelength-converted by the phosphor layer 11 is designed to be focused on the focusing region 15 will be described using the simulation model shown in FIG.
- FIG. 9 is a diagram showing simulation results in the second embodiment.
- the incident angle of incident light 101 to incident light 110 is 0 deg, incident wavelength 550 nm, refractive index of diffractive lens array 14 is 1.5, extinction coefficient is 0, diameter of condensing region 15 is 100 ⁇ m, and diffractive type
- the distance between the lens array 14 and the focusing area 15 is 5.54 mm.
- the pitch d 2 of the diffractive lens array 14 in 2 is set to 15.2 ⁇ m according to Equation 1.
- the pitch d 3 of the diffractive lens array 14 at 3 is set to 10.2 ⁇ m according to Equation 1.
- the pitch d 4 of the diffractive lens array 14 at 4 is set to 7.6 ⁇ m.
- the pitch d 5 of the diffractive lens array 14 at 5 is set to 6.1 ⁇ m.
- the pitch of the microlens array of Comparative Example 2 was 6.1 ⁇ m regardless of the positions of the incident light 101 to the incident light 110. Further, the heights of the microlens array 12 of the present example and the microlens array of the comparative example 2 were changed by 0.5 ⁇ m to 1.5 ⁇ m, and the one with the highest diffraction efficiency was selected.
- the condensing efficiency 4.54 of the microlens array 12 of Example 2 shown in FIG. 9 is a relative value when the condensing efficiency of the microlens array of Comparative Example 2 is 1. From the simulation results shown in FIG. 9, it is understood that the light collection efficiency of the microlens array 12 of Example 2 is higher than the light collection efficiency of the microlens array of Comparative Example 2.
- Example 3 the incident wavelength 450 nm or the incident wavelength 550 nm, that is, the blue light of the light source 16 transmitted through the phosphor layer 11 or yellow light wavelength-converted by the phosphor layer 11 is designed to be collected in the light collecting region 15
- the simulation results for the case where the In the third embodiment, a simulation result in the case where an incident wavelength of 450 nm or an incident wavelength of 550 nm is designed to be condensed on the condensing region 15 for each zone (predetermined area) will be described.
- FIG. 10 is a diagram for explaining a simulation model in the third embodiment.
- FIG. 11 is a diagram showing simulation results in the third embodiment.
- incident light 201 to incident light 208 are added to the simulation model shown in FIG. Specifically, in the simulation model shown in FIG. 10, the microlens array 12 a is disposed on the phosphor layer 11, and the light collecting region 15 is disposed at a predetermined distance from the microlens array 12 a.
- the incident light 101 to the incident light 110 and the incident light 201 to the incident light 208 respectively model incident light which enters the area (zone in the drawing) of the diffractive lens array 14a at an incident angle of 0 °.
- the incident light 101 and the incident light 106 are models of incident light incident on the zone 1 of the diffractive lens array 14 a, and the incident light 102 and the incident light 107 are incident on the zone 3 of the diffractive lens array 14 a. It is a model, and the incident light 103 and the incident light 108 are models of the incident light which injects into the zone 5 of the diffractive lens array 14a. Similarly, incident light 104 and incident light 109 are models of incident light incident on zone 7 of diffractive lens array 14a, and incident light 105 and incident light 110 incident on zone 9 of diffractive lens array 14a. It is a model of incident light.
- the incident light 201 and the incident light 205 are models of incident light incident on the zone 2 of the diffractive lens array 14a, and the incident light 202 and the incident light 206 are incident on the zone 4 of the diffractive lens array 14a. It is a model of light, and the incident light 203 and the incident light 207 are models of incident light which enters the zone 6 of the diffractive lens array 14a. Similarly, incident light 204 and incident light 208 are models of incident light incident on zone 8 of diffractive lens array 14a.
- the incident angle of incident light 101 to incident light 110 is 0 deg, incident wavelength 550 nm, refractive index of diffractive lens array 14 a is 1.5, extinction coefficient is 0, diameter of condensing region 15 is 100 ⁇ m, diffractive type
- the distance between the lens array 14a and the focusing area 15 is 5.54 mm.
- the incident angle of the incident light 101 to the incident light 110 is 0 deg and the incident wavelength is 550 nm, and the incident angle of the incident light 201 to the incident light 208 is 0 deg and the incident wavelength 450 nm.
- the refractive index of the diffractive lens array 14a is 1.5, the extinction coefficient is 0, the diameter of the light collecting area 15 is 100 ⁇ m, and the distance between the diffractive lens array 14a and the light collecting area 15 is 5.54 mm. It is assumed.
- the pitch d 11 of the diffractive lens array 14 a in the zone 1 is 24.8 ⁇ m.
- the pitch d 13 of the diffractive lens array 14 a at 5 is set to 8.3 ⁇ m according to Equation 1.
- the pitch d 14 of the diffractive lens array 14 a at 7 is set to 6.2 ⁇ m according to Equation 1.
- the pitch d 15 of the diffractive lens array 14 a at 9 is 5 ⁇ m according to Equation 1.
- the height of the microlens array 12a corresponding to the positions of the incident light 101 to the incident light 110 was 0.9 ⁇ m.
- the pitch d 21 of the diffractive lens array 14 a in the zone 2 is 20.3 ⁇ m.
- the pitch d 22 of the diffractive lens array 14 a in the zone 4 is 12.2 ⁇ m.
- the pitch d 24 of the diffractive lens array 14 a in the zone 8 is 6.8 ⁇ m.
- the height of the microlens array 12a corresponding to the positions of the incident light 201 to the incident light 208 was 1.2 ⁇ m.
- the pitch of the microlens array of Comparative Example 3 is 6.1 ⁇ m regardless of the positions of the incident light 101 to the incident light 110 and the incident light 201 to the incident light 208. Also, the height of the microlens array of Comparative Example 3 was changed by 0.5 ⁇ m to 1.5 ⁇ m, and the one with the highest diffraction efficiency was selected.
- the condensing efficiency 8.61 of the microlens array 12 a of Example 3 shown in FIG. 11 is a relative value when the condensing efficiency of the microlens array of Comparative Example 3 is 1.
- the simulation results shown in FIG. 11 indicate that the light collection efficiency of the microlens array 12 a of Example 3 is higher than the light collection efficiency of the microlens array of Comparative Example 3.
- the pitch of the diffractive lens array 14a is made different for each predetermined area (zone 1 to zone 9), so the light emitted from the phosphor layer 11 is collected.
- the light region 15 can be sufficiently focused.
- the optical member 10 and the microlens array 12 of the present embodiment since the microlens array 12 and the like having high light collection efficiency are arranged on the phosphor layer 11, The collection efficiency of the emitted light can be made higher. Further, in the optical member 10 and the microlens array 12 according to the present embodiment, it is not necessary to configure a further projection lens in order to condense light in a desired area (the light collecting area 15). Therefore, no loss due to displacement of the projection lens occurs.
- the microlens array 92 disclosed in Patent Document 1 has, for example, a structure in which predetermined cross-sectional shapes are periodically arranged as shown in FIG. Therefore, the light distribution from the micro lens array 92 of the incident light incident at a certain incident angle becomes uniform, and the light can not be collected sufficiently, and if a projection lens for controlling the light distribution is not configured, a desired area (light collecting area 15) can not collect light. Therefore, the light collection efficiency may be further reduced by the loss light due to the positional deviation of the projection lens.
- the pitch is made to differ depending on the angle at which it is desired to emit incident light incident at a certain incident angle for each predetermined area on the phosphor layer 11.
- the pitch is made to differ depending on the angle at which it is desired to emit incident light incident at a certain incident angle for each predetermined area on the phosphor layer 11.
- the optical member comprises a phosphor layer 11 including a phosphor for wavelength-converting a part of light from the light source 16 incident on the incident surface;
- a diffraction-type microlens array 12 for emitting a part of the wavelength-converted light and the other part of the light transmitted through the phosphor layer 11 from the emission surface, and the emission surface of the microlens array 12 performs wavelength conversion
- a plurality of diffractive lenses are provided to diffract and emit a part of the transmitted light and the other part of the transmitted light, and a plurality of diffractive lenses (diffractive lens array 14) The pitch of varies in each predetermined area.
- the pitch of the plurality of diffraction lenses in a partial area of the predetermined area diffracts the other part of the light indicating the wavelength band of the light source 16
- the pitch of the plurality of diffractive lenses in the area of the remaining portion of the predetermined area is set so that the light is condensed in a predetermined area. In order to diffract and condense a part of the wavelength-converted light in a predetermined area, it is provided uniformly in each of the remaining areas.
- the plurality of diffraction lenses diffracts the blue light transmitted through the phosphor layer and the yellow light wavelength-converted by the phosphor layer 11, that is, the white light, and collects them in the light collecting region 15. It can be made to light.
- the pitch of the plurality of diffractive lenses diffracts a part of the wavelength-converted light or the other part of the light and condenses it in a predetermined area. , It is provided constantly in each of the predetermined areas.
- the plurality of diffraction lenses diffracts the blue light transmitted through the phosphor layer 11 and the yellow light that is wavelength-converted by the phosphor layer 11, that is, white light, It can be collected.
- the pitch of the plurality of diffractive lenses narrows from the center to the periphery of the microlens array 12.
- the plurality of diffractive lenses are provided concentrically at the exit surface.
- the cross sections of the plurality of diffractive lenses in a plane perpendicular to the light emitting surface are sawtooth-shaped.
- the light source 16 emits blue light as the light, and the phosphor layer 11 wavelength-converts a part of the light to a wavelength band indicating yellow.
- the diffractive lens array 14 is described as being provided concentrically, it is not limited thereto. It may be provided in a rectangular shape, or may be provided concentrically or in a rectangular shape in each of a plurality of regions.
- the cross section of the diffractive lens array 14 in the plane perpendicular to the light emitting surface has been described as being saw-tooth shaped, but it is not limited thereto.
- the cross section of the diffractive lens array 14b in the plane perpendicular to the emission surface may be triangular.
- the cross section of the diffractive lens array 14c in the plane perpendicular to the light emitting surface may be rectangular.
- the cross section of the diffractive lens array 14d in a plane perpendicular to the light emitting surface may be semicircular.
- the microlens array 12d shown in FIG. 14 is formed of a hemispherical diffractive lens.
- the sawtooth shape in the embodiment can increase the diffraction efficiency with respect to a limited incident angle and wavelength.
- semicircular, triangular or rectangular shapes are preferable for a wide range of incident angles and wavelengths.
- an embodiment realized by arbitrarily combining the components and the functions shown in the above-described embodiments is also included in the scope of the present invention.
- the embodiment can be realized by arbitrarily combining the components and functions in each embodiment within the scope obtained by applying various modifications that those skilled in the art would think to the above embodiment, and the scope of the present invention.
- the form is also included in the present invention.
- the microlens array 12 may be formed directly on the phosphor layer 11 so that light is easily incident from the phosphor layer 11 to the diffractive lens array 14 or the like.
- the phosphor layer 11 is integrated with the microlens array 12.
- a diffractive lens array 14 or the like configured of a plurality of diffractive lenses is provided on the surface of the phosphor layer 11 opposite to the incident surface, and the surface is an output surface.
- the microlens array may be formed of a resin that constitutes the phosphor layer 11 or may be formed of a material having a refractive index similar to that of the phosphor layer 11.
- the optical member 10 in the above embodiment but also the microlens array 12 alone is included in the present invention. That is, a part of the light wavelength-converted by the phosphor layer 11 including the phosphor for wavelength-converting a part of the light from the light source 16 incident on the incident surface and the light transmitted through the phosphor layer 11 And a diffraction-type microlens array that emits light from the other surface from the light-emitting surface to diffract and emit a part of the wavelength-converted light and the other portion of the light that has been transmitted.
- the present invention also includes a microlens array in which the pitch of the diffractive lens array 14 differs in each predetermined area.
- the embodiment can be realized by arbitrarily combining the components and functions in each embodiment within the scope obtained by applying various modifications that those skilled in the art would think to the above embodiment, and the scope of the present invention.
- the form is also included in the present invention.
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
Description
[照明装置]
まず、本実施の形態における光学部材が用いられる照明装置の一例について説明する。
次に、本実施の形態における光学部材の詳細について図3~図7を用いて説明する。
蛍光体層11は、入射面111に入射された光源16からの光の一部を波長変換する蛍光体を含んでいる。ここで例えば、光源16は、青色光を発し、蛍光体層11は、青色光の一部を、黄色を示す波長帯域に波長変換する。
基材13は、マイクロレンズアレイ12の基材である。本実施の形態では、例えば図3に示すように、基材13は、蛍光体層11上に、例えば直径1mm程度の円板状に形成されている。そして、基材13上には、回折型レンズアレイ14が形成される。
回折型レンズアレイ14は、例えば図3に示すようにマイクロレンズアレイ12の出射面に設けられる複数の回折レンズの一例である。回折型レンズアレイ14は、蛍光体層11で波長変換された光の一部と蛍光体層11を透過した光の他部とを出射面から出射する。回折型レンズアレイ14のピッチは、所定の区域(ゾーン)ごとに異なる。また、回折型レンズアレイ14のピッチは、回折型レンズアレイ14の中心から周辺に向かって狭くなっている。なお、図3に示す例では、回折型レンズアレイ14の中心は、X軸とY軸との交点で示されている。また、回折型レンズアレイ14の中心から周辺に向かう方向は、X軸からY軸に沿ってX軸から離れる方向で示されている。
以上のように構成された光学部材10の効果を確認するために、回折型レンズアレイ14のピッチを所定の区域(ゾーン)ごとに異ならせて光学シミュレーションを行った。実施例として以下説明する。なお、回折型レンズアレイ14(マイクロレンズアレイ12)の集光効率(回折効率)を決定するパラメータは、回折型レンズアレイ14(マイクロレンズアレイ12)の高さ、断面形状などがある。この集光効率は、マイクロレンズアレイ12を実際に作成せずに、光学シミュレーションを行うことで知ることができる。
図6は、実施例1におけるシミュレーションモデルを説明するための図である。図7は、実施例1におけるシミュレーション結果を示す図である。図8は、比較例1におけるシミュレーション結果を概観的に示す図である。
実施例1では、入射波長450nmすなわち蛍光体層11を透過した光源16の青色光を集光領域15に集光するよう設計した場合のシミュレーション結果について示したが、それに限らない。実施例2では、図6に示すシミュレーションモデルを用いて、入射波長550nmすなわち蛍光体層11で波長変換された黄色光を集光領域15に集光するよう設計した場合のシミュレーション結果について説明する。
実施例1および2では、入射波長450nmまたは入射波長550nmすなわち蛍光体層11を透過した光源16の青色光または蛍光体層11で波長変換された黄色光を集光領域15に集光するよう設計した場合のシミュレーション結果について示したが、それに限らない。実施例3では入射波長450nmまたは入射波長550nmをゾーン(所定の区域)ごとに集光領域15に集光するよう設計した場合のシミュレーション結果について説明する。
以上のように、本実施の形態の光学部材10およびマイクロレンズアレイ12等によれば、蛍光体層11上に集光効率の高いマイクロレンズアレイ12等が配置されるため、蛍光体層11から出射される光の集光効率をより高くすることができる。また、本実施の形態の光学部材10およびマイクロレンズアレイ12等では、所望の領域(集光領域15)に光を集光させるためにさらなる投影レンズを構成する必要がない。そのため、投影レンズの位置ずれによる損失も発生しない。
上記の実施の形態では、回折型レンズアレイ14は、同心円状に設けられているとして説明したが、それに限らない。矩形状に設けられていても良いし、複数の領域それぞれに同心円状または矩形状に設けられるとしてもよい。
上述した実施の形態は一例にすぎず、各種の変更、付加、省略等が可能であることは言うまでもない。
12、12a、12b、12c、12d マイクロレンズアレイ
14、14a、14b、14c、14d 回折型レンズアレイ
16 光源
111 入射面
Claims (12)
- 入射面に入射された光源からの光の一部を波長変換する蛍光体を含む蛍光体層と、
前記蛍光体層で波長変換された前記光の一部と前記蛍光体層を透過した前記光の他部とを出射面から出射する回折型のマイクロレンズアレイとを備え、
前記マイクロレンズアレイの出射面には、波長変換された前記光の一部と透過した前記光の他部とを回折して出射するための複数の回折レンズが設けられており、
前記複数の回折レンズのピッチは、所定の区域ごとに異なる、
光学部材。 - 前記複数の回折レンズのうち、前記所定の区域の一部の区域における複数の回折レンズのピッチは、前記光源の波長帯域を示す前記光の他部を、回折させて予め定められた領域に集光するように、当該一部の区域それぞれで一定に設けられており、
前記複数の回折レンズのうち、前記所定の区域の残部の区域における複数の回折レンズのピッチは、波長変換された前記光の一部を、回折させて前記予め定められた領域に集光するように、当該残部の区域それぞれで一定に設けられている、
請求項1に記載の光学部材。 - 前記複数の回折レンズのピッチは、波長変換された前記光の一部または前記光の他部を、回折させて予め定められた領域に集光するように、前記所定の区域毎に一定に設けられている、
請求項1に記載の光学部材。 - 前記複数の回折レンズのピッチは、
前記マイクロレンズアレイの中心から周辺に向かって狭くなる、
請求項2または3に記載の光学部材。 - 前記複数の回折レンズは、前記出射面において同心円状に設けられている、
請求項2~4のいずれか1項に記載の光学部材。 - 前記出射面に垂直な面における前記複数の回折レンズの断面は、
鋸歯状である、
請求項1~5のいずれか1項に記載の光学部材。 - 前記出射面に垂直な面における前記複数の回折レンズの断面は、
矩形状である、
請求項1~5のいずれか1項に記載の光学部材。 - 前記出射面に垂直な面における前記複数の回折レンズの断面は、
三角形状である、
請求項1~5のいずれか1項に記載の光学部材。 - 前記出射面に垂直な面における前記複数の回折レンズの断面は、
半円状である、
請求項1~5のいずれか1項に記載の光学部材。 - 前記光源は、前記光として、青色光を発し、
前記蛍光体層は、前記光の一部を、黄色を示す波長帯域に波長変換する、
請求項1~9のいずれか1項に記載の光学部材。 - 前記蛍光体層は、前記マイクロレンズアレイと一体構成であり、
前記複数の回折レンズは、前記蛍光体層における前記入射面と反対側の表面に設けられており、
前記表面は、前記出射面である、
請求項1~10のいずれか1項に記載の光学部材。 - 入射面に入射された光源からの光の一部を波長変換する蛍光体を含む蛍光体層で波長変換された前記光の一部と、前記蛍光体層を透過した前記光の他部とを出射面から出射する回折型のマイクロレンズアレイであって、
前記出射面には、波長変換された前記光の一部と透過した前記光の他部とを回折して出射するための複数の回折レンズが設けられており、
前記複数の回折レンズのピッチは、所定の区域ごとに異なる、
マイクロレンズアレイ。
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JP2017544201A JP6621038B2 (ja) | 2015-10-09 | 2016-10-06 | 光学部材およびマイクロレンズアレイ |
EP16853275.2A EP3361293B1 (en) | 2015-10-09 | 2016-10-06 | Optical member comprising microlens array |
US15/765,261 US10174909B2 (en) | 2015-10-09 | 2016-10-06 | Optical member and microlens array |
CN201680057379.7A CN108139517B (zh) | 2015-10-09 | 2016-10-06 | 光学部件及微透镜阵列 |
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