WO2022004036A1 - 面状照明装置 - Google Patents
面状照明装置 Download PDFInfo
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- WO2022004036A1 WO2022004036A1 PCT/JP2021/004566 JP2021004566W WO2022004036A1 WO 2022004036 A1 WO2022004036 A1 WO 2022004036A1 JP 2021004566 W JP2021004566 W JP 2021004566W WO 2022004036 A1 WO2022004036 A1 WO 2022004036A1
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- WIPO (PCT)
- Prior art keywords
- lens
- linear fresnel
- light
- fresnel lens
- lighting device
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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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
- F21V5/007—Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane
-
- 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
-
- 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
- F21V5/045—Refractors for light sources of lens shape the lens having discontinuous faces, e.g. Fresnel lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
- G02B27/425—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application in illumination systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
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- 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
- F21Y2105/00—Planar light sources
- F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
Definitions
- the present invention relates to a planar lighting device.
- a planar lighting device used as a backlight such as a head-up display (HUD) is required to have performance and functions such as high brightness, high contrast, high brightness uniformity, low power consumption, thinness, and support for local dimming.
- HUD head-up display
- performance and functions such as high brightness, high contrast, high brightness uniformity, low power consumption, thinness, and support for local dimming.
- the backlight of the head-up display is required to have a brightness about 100 times higher, so the realization of high brightness is possible. is important.
- the present invention has been made in view of the above, and is a surface surface capable of simultaneously satisfying some of performances and functions such as high brightness, high contrast, high brightness uniformity, low power consumption, thinness, and support for local dimming.
- the purpose is to provide a lighting device.
- the planar illumination device includes a substrate, a first linear Fresnel lens, and a second linear Fresnel lens.
- a substrate In the substrate, a plurality of light sources are arranged two-dimensionally in a grid pattern.
- the first linear Fresnel lens is arranged on the exit side of the plurality of light sources, and the groove forming the uneven surface of the lens extends in one direction.
- the second linear Fresnel lens is arranged on the exit side of the first linear Fresnel lens, and a groove forming an uneven surface of the lens extends in a direction orthogonal to the one direction.
- planar lighting device can simultaneously satisfy some of the performances and functions such as high brightness, high contrast, high brightness uniformity, low power consumption, thinness, and support for local dimming.
- FIG. 1 is a diagram showing a configuration example of a head-up display system.
- FIG. 2 is a front view of the planar lighting device 1 according to the first embodiment.
- FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2 of the planar lighting device.
- FIG. 4 is a schematic view of grooves provided on both sides of the condenser lens.
- FIG. 5 is a diagram showing an example of a cross-sectional configuration on the incident side of the condenser lens.
- FIG. 6 is a sectional view taken along the line AA showing another configuration example of the planar lighting device.
- FIG. 7 is a schematic view of a groove formed on one side of each condenser lens.
- FIG. 8A is a diagram showing a state of refraction of light rays in the horizontal direction by the condenser lens.
- FIG. 8B is a diagram showing an example of the directivity characteristic of the luminous intensity of the horizontal light.
- FIG. 9A is a diagram showing a state of refraction of light rays in the vertical direction by the condenser lens.
- FIG. 9B is a diagram showing an example of the directivity characteristic of the luminous intensity of light in the vertical direction.
- FIG. 10 is a diagram showing an example of a cross-sectional configuration on the incident side of the field lens.
- FIG. 11 is a diagram showing a state of refraction of light rays in the horizontal direction by the field lens.
- FIG. 12 is an enlarged view for showing dots provided on the other surface of the field lens.
- FIG. 13 is a diagram showing an example of the surface configuration on the emission side of the field lens.
- FIG. 14 is a cross-sectional view of the planar lighting device according to the second embodiment.
- FIG. 15 is a schematic view of grooves provided on both sides of the first field lens.
- FIG. 16 is a diagram showing an example of a cross-sectional configuration on the incident side of the first field lens.
- FIG. 17 is a diagram showing an example of the directivity characteristics of the luminous intensity of the horizontal and vertical directions after passing through the first field lens.
- FIG. 18 is a diagram showing an example of the directivity characteristics of the luminous intensity of the horizontal and vertical directions after passing through the second field lens.
- FIG. 19 is a cross-sectional view of the planar lighting device according to the third embodiment.
- FIG. 20 is a diagram showing a structure on the incident side of the field lens.
- FIG. 21 is a diagram showing a structure on the exit side of the field lens.
- FIG. 22 is a diagram showing another example of the field lens.
- FIG. 23 is a cross-sectional view taken along the X-axis direction (horizontal direction) of the planar lighting device according to the fourth embodiment.
- FIG. 24 is a cross-sectional view taken along the Y-axis direction (vertical direction) of the planar lighting device according to the fourth embodiment.
- FIG. 25 is a diagram showing a state of refraction of light rays in the vertical direction by the surface on the exit side of the condenser lens.
- FIG. 20 is a diagram showing a structure on the incident side of the field lens.
- FIG. 21 is a diagram showing a structure on the exit side of the field lens.
- FIG. 22 is
- FIG. 26 is a diagram showing a state of refraction of light rays in the horizontal direction by a field lens.
- FIG. 27 is an enlarged cross-sectional view of the lenticular lens on the incident side surface of the field lens.
- FIG. 28 is a diagram showing a state of refraction of light rays in the horizontal direction according to the fifth embodiment.
- FIG. 29 is a diagram showing an example of the relationship between the angle of spread of the emitted light of the light source 3 and the prism pitch and the prism height.
- FIG. 1 is a diagram showing a configuration example of the head-up display system 100.
- the traveling direction of the automobile is the left direction (positive direction of the Y axis) in the figure.
- the emitted light of the planar lighting device 1 passes through the liquid crystal panel 101 (L1), is reflected by the mirror 102 (L2), and is guided to the concave mirror 103.
- the light (L3) reflected from the concave mirror 103 is applied to a screen 104 such as the windshield of an automobile, and the reflected light (L4) enters the eye box (viewpoint) EB of the driver or the like and is drawn on the liquid crystal panel 101.
- the image is recognized as a virtual image.
- "H (horizontal direction)" in the X-axis direction and “V (vertical direction)" in the Y-axis direction are also written in the horizontal and vertical directions of the imaginary image seen from the eyebox EB, as will be described later. This is to show the correspondence between the direction and the direction of the emission surface of the planar lighting device 1.
- FIG. 2 is a front view of the planar lighting device 1 according to the first embodiment.
- the light emitting surface of the planar illuminating device 1 is in the XY plane, and the thickness direction of the planar illuminating device 1 is the Z direction.
- the X-axis direction corresponds to the horizontal direction (H) and the Y-axis direction.
- the vertical direction (V) corresponds to the vertical direction (V).
- the planar lighting device 1 has a substantially rectangular plate-shaped outer shape, and light is emitted from the inside of the opening 7a of the frame 7.
- the size of the opening 7a is, for example, 42 mm in the X-axis direction and 21 mm in the Y-axis direction.
- the outer shape of the planar lighting device 1 is not limited to that shown in the figure. Further, the frame 7 may be omitted.
- FIG. 3 is a sectional view taken along the line AA in FIG. 2 of the planar lighting device 1.
- a plurality of light sources 3 using LEDs (Light Emitting Diodes) or the like are two-dimensionally arranged in a grid pattern on a substrate 2 made of aluminum or the like having excellent heat dissipation, after being appropriately insulated. Is located in.
- Each light source 3 is driven individually and can cope with so-called local dimming.
- a reflector 4 having four reflecting surfaces 4a surrounding each of the plurality of light sources 3 is arranged.
- the peripheral edge of the reflector 4 has a frame shape thicker than the height of the reflecting surface 4a, and a space is provided on the tip end side of the reflecting surface 4a.
- the reflective surface 4a may extend until it comes into contact with the condenser lens 5, which will be described later, without providing a space on the tip end side of the reflective surface 4a.
- the reflector 4 is made of resin or the like. The reflector 4 may be omitted.
- a condenser lens 5 is arranged on the exit side of the reflector 4.
- a first linear groove extending in one direction (in the present embodiment, the depth direction (Y-axis direction) in the figure) forming the concave-convex surface of the lens.
- a Fresnel lens is formed.
- the direction in which the groove forming the concave-convex surface of the lens is orthogonal to one direction of the surface 5a in the present embodiment, the left-right direction (X-axis direction) in the figure).
- a second linear Fresnel lens is formed.
- a field lens 6 that changes the light distribution and diffuses the light is arranged on the emission side of the condenser lens 5.
- the field lens 6 is assumed to change the light distribution in the horizontal direction, and is formed on the lower surface 6a in the figure of the field lens 6 and has a groove in the depth direction (Y-axis direction) in the figure. Is formed from an extending prism.
- minute dots that diffuse light are formed over the entire surface.
- the frame 7 is not a cross section, but an end portion of the opening 7a (FIG. 2) is visible.
- One peripheral edge of the condenser lens 5 or the field lens 6 has a thick frame shape, and a gap is provided between the condenser lens 5 and the field lens 6 other than the peripheral edge.
- a frame-shaped spacer may be provided between the condenser lens 5 and the field lens 6.
- FIG. 4 is a schematic view of grooves 5c and 5d provided on both sides of the condenser lens 5.
- a groove 5c extending in the Y-axis direction constituting the first linear Fresnel lens is formed on the lower (incident side) surface 5a of the condenser lens 5.
- a groove 5d extending in the X-axis direction constituting the second linear Fresnel lens is formed on the upper surface (emission side) surface 5b of the condenser lens 5.
- FIG. 5 is a diagram showing an example of a cross-sectional configuration on the incident side of the condenser lens 5.
- the surface 5a on the incident side of the condenser lens 5 has a prism structure in which a cylinder-shaped convex lens is used as a Fresnel lens for each segment corresponding to the light source 3 (FIG. 3), and has a prism structure in the depth direction (Y-axis direction) in the figure. Has a groove extending to. At the segment boundary BL between adjacent segments, the angle of the prism is inverted. Even on the emission side of the condenser lens 5, the directions in which the grooves extend are orthogonal to each other, but a similar prism structure is provided.
- the first and second linear Fresnel lenses have a pitch of the light source 3 (FIG. 3) arranged directly underneath (the first linear Fresnel lens has a pitch in the X-axis direction, and the second linear Fresnel lens has a pitch in the Y-axis direction). ), Grooves are formed periodically. Then, at the time of assembly, the condenser lens 5 is arranged so that the center of the lens is located directly above the light source 3 in each of the Y-axis direction and the X-axis direction.
- FIG. 6 is a sectional view taken along the line AA showing another configuration example of the planar lighting device 1.
- FIG. 6 is different from the configuration of FIG. 3 in that the condenser lens 5 is composed of two condenser lenses 51 and 52, and the other configurations are the same. It should be noted that which of the lower surface 51a and the upper surface 51b of the condenser lens 51 should be provided with the Fresnel lens groove, and which of the lower surface 52a and the upper surface 52b of the condenser lens 52 should be provided with the Fresnel lens groove. There are several patterns depending on the combination of the heel.
- One peripheral edge of the condenser lenses 51 and 52 has a thick frame shape, and a gap is provided between the condenser lenses 51 and 52 other than the peripheral edge.
- a frame-shaped spacer may be provided between the condenser lenses 51 and 52.
- the manufacturing becomes easier. If the pitch in the X-axis direction and the pitch in the Y-axis direction of the light source are the same, one type of large linear Fresnel lens may be manufactured, and the lens may be cut out in a different direction and used. It will be easier.
- FIG. 7 is a schematic view of grooves 51c and 52c provided on one side of the condenser lenses 51 and 52, respectively.
- the lower surface 51a of the lower condenser lens 51 is provided with a groove 51c extending in the Y-axis direction
- the upper surface 52b of the upper condenser lens 52 is a Fresnel lens extending in the X-axis direction.
- the groove 52c is provided.
- FIG. 8A is a diagram showing a state of refraction of light rays in the horizontal direction by the condenser lens 5. That is, FIG. 8A shows the behavior of light in the cross section along the horizontal direction (X, H) and the normal direction (Z) of the exit surface during use.
- the field lens 6 is not shown.
- the light indicated by the broken line emitted from the light source 3 is X by the first linear Fresnel lens in which an uneven surface is formed from a groove extending in the Y-axis direction provided on the lower surface 5a of the condenser lens 5. It is refracted in the -Z plane and becomes substantially parallel light.
- FIG. 8B is a diagram showing an example of the directivity characteristic of the luminous intensity of the horizontal light, and the angle range (1/2 beam angle) for maintaining the intensity of about half of the peak is about 10 °.
- FIG. 9A is a diagram showing a state of refraction of light rays in the vertical direction by the condenser lens 5. That is, FIG. 9A shows the behavior of light in the cross section along the vertical direction (Y, V) and the normal direction (Z) of the exit surface during use. The field lens 6 is not shown.
- the light indicated by the broken line emitted from the light source 3 is not strongly refracted by the first linear Fresnel lens provided on the lower surface 5a of the condenser lens 5, and is substantially as it is inside the condenser lens 5. move on.
- FIG. 9B is a diagram showing an example of the directivity characteristic of the luminous intensity of the light in the vertical direction, and the angle range (1/2 beam angle) for maintaining the intensity of about half of the peak is about 10 °.
- FIG. 10 is a diagram showing an example of a cross-sectional configuration on the incident side of the field lens 6.
- one cross section of the surface 6a on the incident side of the field lens 6 has a prism structure equivalent to that of a ring-shaped concave lens as a Fresnel lens, and this becomes a linear prism in the depth direction (in the figure). It has a groove extending in the Y-axis direction). The tilt angle of the prism becomes steeper as it goes away from the center.
- FIG. 11 is a diagram showing a state of refraction of light rays in the horizontal direction by the field lens 6. That is, FIG. 11 shows the behavior of light in the cross section along the horizontal direction (X, H) and the normal direction (Z) of the exit surface during use.
- a head-up display or the like as shown in FIG. 1, light from a planar lighting device 1 as a backlight of a liquid crystal panel 101 is reflected on a screen 104 via a mirror 102 or a concave mirror 103 and used. It gets into the eyes of others.
- the optical axis of the light reflected by the concave mirror 103 is tilted inward, the optical axis outside the center is outside in order to secure the angle range of the optical axis required for the light emitted from the concave mirror 103. It is necessary to supply the light inclined to the surface from the planar lighting device 1.
- the optical axis is the axis along the direction of the highest intensity of the light emitted from one light source or a minute portion (whether it is parallel light or synchrotron radiation). Therefore, the optical axis is tilted outward in the horizontal direction according to the horizontal distance from the center of the planar lighting device 1.
- the angle range of the optical axis required for the emitted light of the concave mirror 103 can be secured, and it is possible to prevent the end portion of the virtual image from becoming invisible.
- the center may be inclined in a predetermined direction instead of substantially parallel light, and both sides thereof may be inclined outward with respect to the inclination of the center.
- FIG. 11 shows the cross-sectional configuration of the planar illuminating device 1 as in FIG. 3, and the inclination angle of the two light sources 3 near the center of the planar illuminating device 1 is 0 °, and the inclination angle is 0 ° from the side thereof. The angle is changed to 2 °, and the inclination angle is changed to 4 ° next to it.
- the numerical values of the tilt angle shown in the figure are merely examples. The tilt angle is determined by the shape of the prisms constituting the field lens 6.
- the inclination angle is 0 °, and light is emitted in the front direction (normal direction) of the field lens 6 as shown in the enlarged view on the upper side of the figure.
- the inclination angle is 6 °, and as shown in the enlarged view on the upper side of the figure, light inclined to the left side with respect to the front direction of the field lens 6 is emitted.
- the inclination angle is 6 °, and as shown in the enlarged view on the upper side of the figure, light inclined to the right side with respect to the front direction of the field lens 6 is emitted.
- the tilt angle is changed for each light source 3 in FIG. 11, the tilt angle may be changed for each region including a plurality of light sources 3.
- FIG. 12 is an enlarged view (enlarged view of the region R in FIG. 11) for showing the dots 6c provided on the other surface 6b of the field lens 6.
- FIG. 13 is a diagram showing an example of the surface configuration on the emission side of the field lens 6.
- minute dots 6c formed from a mold or the like formed by laser processing or the like are formed on the upper surface 6b in the figure of the field lens 6. The minute dots 6c diffuse the passing light and enhance the luminance uniformity.
- the dots 6c for example, a simulation was performed when the dots were arranged in a 6-way arrangement, the dot outer shape was 35 ⁇ m, and the dot contact angles were 5 °, 10 °, 15 °, and 20 °.
- the dot heights at the dot contact angles of 5 °, 10 °, 15 °, and 20 ° are 0.8 ⁇ m, 1.5 ⁇ m, 2.3 ⁇ m, and 3.1 ⁇ m, respectively.
- the field lens 6 may use a general diffusion sheet separate from the field lens 6 instead of the dots provided on the other surface 6b.
- the light distributed substantially in parallel through the condenser lens 5 is adjusted in the horizontal direction by the field lens 6, but the light emitted from the condenser lens 5 is emitted. If the light distribution of the emitted light is too narrow, the brightness uniformity may deteriorate. That is, the brightness of the peripheral portion may be too low as compared with the central portion. Therefore, in the second embodiment, the horizontal and vertical light distribution of the emitted light of the condenser lens 5 is expanded.
- FIG. 14 is a cross-sectional view of the planar lighting device 1 according to the second embodiment.
- the field lens 6 in FIG. 3 becomes the second field lens 62 as it is, and the first field lens 61 is arranged between the condenser lens 5 and the second field lens 62.
- On the lower incident side surface 61a in the figure of the first field lens 61 a groove forming the uneven surface of the lens extends in one direction (in the present embodiment, the depth direction (Y-axis direction) in the figure). 1 lenticular lens is formed.
- a second lenticular lens is formed.
- a lenticular lens is a linear lens having a semi-cylindrical cross-sectional shape.
- the second field lens 62 has a prism structure that changes the light distribution on the surface 62a on the incident side, and dots are formed on the surface 62b on the exit side, which is the same as the field lens 6 in FIG.
- the condenser lens 5 may have a double configuration of the condenser lenses 51 and 52.
- FIG. 15 is a schematic view of grooves 61c and 61d provided on both sides of the first field lens 61.
- a groove 61c extending in the Y-axis direction constituting the first lenticular lens is formed on the lower (incident side) surface 61a of the field lens 61.
- a groove 61d extending in the X-axis direction constituting the second lenticular lens is formed on the upper surface (emission side) surface 61b of the field lens 61.
- FIG. 16 is a diagram showing an example of a cross-sectional configuration on the incident side of the first field lens 61.
- the surface 61a on the incident side of the first field lens 61 has a linear first lenticular lens having a semi-cylindrical (R-shaped) cross-sectional shape. Even on the emission side of the first field lens 61, the extending directions of the grooves are orthogonal to each other, but a second lenticular lens having the same structure is provided.
- FIG. 17 is a diagram showing an example of the directivity characteristics of the luminous intensity of the horizontal and vertical directions after passing through the first field lens 61.
- the first lenticular lens on the incident side of the first field lens 61 acts in the horizontal direction (H), and the second lenticular lens on the exit side acts in the vertical direction (V).
- the lenticular lens is an aggregate of linear convex lenses, and the substantially parallel light incident from the condenser lens 5 is condensed into light that intersects and spreads.
- the horizontal light from the condenser lens 5 has a 1/2 beam angle of 10 ° (FIG. 8B) of 30 °
- the vertical light has a 1/2 beam angle of 10 ° (FIG. 9B) of 13. It spreads to °.
- FIG. 18 is a diagram showing an example of the directivity characteristics of the luminous intensity of the horizontal and vertical directions after passing through the second field lens 62.
- the 1/2 beam angle 30 ° (FIG. 17) of the horizontal light from the first field lens 61 is slightly widened to 31 °.
- the 1/2 beam angle of vertical light remains unchanged at 13.0 °.
- the third embodiment is an improved version of the second embodiment, in which the main functions of the field lenses 61 and 62 in the second embodiment (FIG. 14) are realized by one field lens 63, and the main functions are realized. It makes it easier to reduce the number of parts.
- FIG. 19 is a cross-sectional view of the planar lighting device 1 according to the third embodiment.
- the difference from FIG. 14 is that the field lenses 61 and 62 are changed to the field lens 63 and the diffuser plate 64. That is, the emission side of the field lens 61 is concave over almost the entire emission surface of the planar lighting device 1, so that the prism structure on the incident side of the field lens 62 is unnecessary. Further, the diffusion dots provided on the emission side of the field lens 62 are replaced with the diffusion plate 64.
- the diffusion plate 64 may be moved to the outside of the frame 7, or may be omitted when diffusion is not necessary.
- FIG. 20 is a diagram showing a structure on the incident side of the field lens 63
- FIG. 21 is a diagram showing a structure on the exit side of the field lens 63.
- a lenticular lens having a semi-cylindrical cross-sectional shape is provided on the flat surface 63a on the incident side of the field lens 63 so as to extend in the Y-axis direction.
- the surface 63b on the emission side of the field lens 63 has a concave shape in the XZ plane, and a lenticular lens having a semi-cylindrical cross-sectional shape is provided on the surface 63b so as to extend in the X-axis direction.
- FIG. 22 is a diagram showing another example of the field lens 63, in which the surface 63a on the incident side is concave in the YY plane and the surface 63b on the exit side is concave in the XX plane. ing.
- the surface 5a on the incident side of the first condenser lens 5 collects light in a substantially parallel direction in the horizontal direction
- the surface 5b on the exit side collects light in the vertical direction and tilts the optical axis.
- the light is diffused in the horizontal direction on the incident side surface 6a of the second field lens 6, and the optical axis is tilted in the horizontal direction on the emitting side surface 6b.
- the tilt of the optical axis in the horizontal direction is larger than that in the vertical direction. It is possible to supply light with appropriate optical axis control to the concave mirror of the head-up display system.
- each light source 3 such as an LED with a one-sided linear Fresnel lens and to achieve a large inclination of the optical axis.
- the optical axis By tilting the optical axis, it becomes easier to realize.
- the configuration is such that the light is not diffused in the vertical direction.
- FIG. 23 is a cross-sectional view of the planar lighting device 1 according to the fourth embodiment along the X-axis direction (horizontal direction).
- FIG. 24 is a cross-sectional view taken along the Y-axis direction (vertical direction) of the planar lighting device 1 according to the fourth embodiment.
- the substrate 2, the light source 3, the reflector 4, the condenser lens 5, and the field lens 6 are the same as those in FIG. 3 (first embodiment).
- the sheet 8 is provided. The reason why the diffusion sheet 8 is arranged at an angle with respect to the optical axis is to reduce the influence of external light (mainly sunlight).
- the first horizontal Fresnel lens for the horizontal direction provided on the incident side surface 5a of the condenser lens 5 is the same as in FIGS. 4 and 5. That is, a linear Fresnel lens that collects light for each light source 3 such as an LED is provided on the surface 5a on the incident side of the condenser lens 5 in the horizontal direction.
- the state of refraction of light rays in the horizontal direction by the condenser lens 5 is the same as in FIG. 8A.
- the second linear Fresnel lens for the vertical direction provided on the emission side surface 5b of the condenser lens 5 has a groove orientation similar to that in FIGS. 4 and 5, but is a light source such as an LED.
- the angle of the lens is adjusted so that not only the light is focused on substantially parallel light every 3 but also the optical axis is changed to the outside of the vertical direction in use according to the distance from the center in the vertical direction in use. There is. That is, the light remains substantially parallel at the center of the emission surface, and the optical axis is inclined outward as the light moves outward from the center.
- FIG. 25 is a diagram showing a state of refraction of light rays in the vertical direction by the surface 5b on the exit side of the condenser lens 5. That is, FIG. 25 shows the behavior of light in the cross section along the vertical direction (Y, V) and the normal direction (Z) of the exit surface during use.
- the center of the planar illuminating device 1 is focused on substantially parallel light, and the optical axis is further inclined outward on both sides thereof.
- the field lens 6 is not shown.
- FIGS. 23 and 24 a horizontal lenticular lens having a groove extending in the Y-axis direction is provided on the incident side surface 6a of the field lens 6 to diffuse light in the horizontal direction.
- a horizontal linear prism having a groove extending in the Y-axis direction is provided on the surface 6b on the emission side of the field lens 6 so that the optical axis is tilted in the horizontal direction.
- FIG. 26 is a diagram showing a state of refraction of light rays in the horizontal direction by the field lens 6. That is, FIG. 26 shows the behavior of light in the cross section along the horizontal direction (X, H) and the normal direction (Z) of the exit surface during use.
- the linear prism of the surface 6b on the emission side does not incline the optical axis at the center, and the inclination of the optical axis increases toward the outside.
- the lenticular lens of the surface 6a on the incident side has a larger spread angle of light on the outside than the spread angle of light due to diffusion at the center. This is to improve the luminance uniformity of the virtual image in the outer portion where the optical axis is inclined. That is, when light with strong directivity (light with a narrow spread angle) is emitted toward the user, the brightness changes sharply when the user swings his / her line of sight to the left or right, and the visibility deteriorates. .. This is particularly noticeable at the end where the optical axis is inclined. Therefore, the spread angle of light on the outside is larger than the spread angle of light due to diffusion at the center.
- FIG. 27 is an enlarged cross-sectional view of the lenticular lens of the surface 6a on the incident side of the field lens 6 and is a contact angle ⁇ of the lenticular lens (angle formed by the main surface of the field lens 6 and the tangent line of the end of the R shape).
- the configurations and functions of the incident side and the emitting side of the field lens 6 can be exchanged, or the configurations and functions of the incident side and the emitting side of the condenser lens 5 can be exchanged. That is, the surface 5a on the incident side of the first condenser lens 5 collects light in a substantially parallel direction in the horizontal direction, and the surface 5b on the exit side collects light in the vertical direction and inclines the optical axis.
- the light axis can be tilted in the horizontal direction on the incident side surface 6a of the second field lens 6, and the light can be diffused in the horizontal direction on the emitting side surface 6b.
- the surface 5a on the incident side of the first condenser lens 5 collects light in the vertical direction and tilts the optical axis
- the surface 5b on the exit side collects light in a substantially parallel direction in the horizontal direction.
- Light can be diffused in the horizontal direction on the incident side surface 6a of the field lens 6 of the eye, and the optical axis can be tilted in the horizontal direction on the emitting side surface 6b.
- the surface 5a on the incident side of the first condenser lens 5 collects light in the vertical direction and tilts the optical axis
- the surface 5b on the exit side collects light in a substantially parallel direction in the horizontal direction.
- the light axis can be tilted in the horizontal direction on the incident side surface 6a of the field lens 6 of the eye, and the light can be diffused in the horizontal direction on the exit side surface 6b.
- the surface 5a on the incident side of the first condenser lens 5 is used to collect light and tilt the optical axis in the horizontal direction
- the surface 5b on the exit side is used to collect light and tilt the optical axis in the vertical direction.
- the tilting is performed so that the light is diffused in the horizontal direction on the incident side surface 6a of the second field lens 6, and the light is diffused in the vertical direction on the emitting side surface 6b.
- the tilt of the optical axis can be completed at the stage of the condenser lens 5 before entering the field lens 6, and the function of the field lens 6 is limited to the diffusion of light, and the configuration can be simplified.
- the outline of the overall configuration is the same as in FIGS. 23 and 24, but the configurations and functions of the condenser lens 5 and the field lens 6 are slightly different.
- the first horizontal linear frennel lens provided on the incident side surface 5a of the condenser lens 5 not only concentrates light in substantially parallel light for each light source 3 such as an LED, but also from the horizontal center during use.
- the angle of the lens is adjusted so as to change the optical axis to the outside in the horizontal direction at the time of use according to the distance of. That is, the light remains substantially parallel at the center of the emission surface, and the optical axis is inclined outward as the light moves outward from the center.
- FIG. 28 is a diagram showing a state of refraction of light rays in the horizontal direction according to the fifth embodiment. That is, FIG. 28 shows the behavior of light in a cross section along the horizontal direction (X, H) and the normal direction (Z) of the exit surface during use. In FIG. 28, the field lens 6 is not shown. In FIG. 28, the center of the planar illuminating device 1 is focused on substantially parallel light, and the optical axis is further inclined outward on both sides thereof.
- the second linear Fresnel lens for the vertical direction provided on the emission side surface 5b of the condenser lens 5 not only collects light in substantially parallel light for each light source 3 such as an LED, as in the fourth embodiment.
- the angle of the lens is adjusted so as to change the optical axis to the outside of the vertical direction in use according to the distance from the center in the vertical direction in use.
- the state of refraction of light is the same as in FIG. 25. That is, the light remains substantially parallel at the center of the emission surface, and the optical axis is inclined outward as the light moves outward from the center.
- the center may be inclined in a predetermined direction instead of substantially parallel light, and both sides thereof are inclined outward with respect to the inclination of the center. Just do it.
- a horizontal lenticular lens having a groove extending in the Y-axis direction is provided on the surface 6a on the incident side of the field lens 6 to diffuse light in the horizontal direction.
- a vertical lenticular lens having a groove extending in the X-axis direction is provided on the emission side surface 6b of the field lens 6 to diffuse light in the vertical direction.
- the configurations and functions of the incident side and the emitting side of the field lens 6 can be exchanged, or the configurations and functions of the incident side and the emitting side of the condenser lens 5 can be exchanged. That is, the surface 5a on the incident side of the first condenser lens 5 collects light and tilts the optical axis in the horizontal direction, and the surface 5b on the exit side collects light and tilts the optical axis in the vertical direction. It is possible to diffuse the light in the vertical direction on the incident side surface 6a of the second field lens 6 and to diffuse the light in the horizontal direction on the emitting side surface 6b.
- the surface 5a on the incident side of the first condenser lens 5 is used to collect light and tilt the optical axis in the vertical direction
- the surface 5b on the exit side is used to collect light and tilt the optical axis in the horizontal direction. It is possible to diffuse the light in the horizontal direction on the incident side surface 6a of the second field lens 6 and to diffuse the light in the vertical direction on the emitting side surface 6b.
- the surface 5a on the incident side of the first condenser lens 5 is used to collect light and tilt the optical axis in the vertical direction
- the surface 5b on the exit side is used to collect light and tilt the optical axis in the horizontal direction. It is possible to diffuse the light in the vertical direction on the incident side surface 6a of the second field lens 6 and to diffuse the light in the horizontal direction on the emitting side surface 6b.
- FIG. 29 is a diagram showing an example of the relationship between the angle of spread of the emitted light of the light source 3 and the prism pitch and the prism height.
- light is emitted from one light source 3 arranged on the substrate 2 with a light distribution spread at a predetermined angle, and a region of one segment of a linear Fresnel lens formed on the surface 5a of the condenser lens 5. It shows how light is incident inside. Further, a part of the prisms of the linear Fresnel lens is shown enlarged, and the prism pitch is a and the prism height is b.
- the prism height b with respect to the prism pitch a is relatively small at the center of the segment, but the edge of the segment. In the portion, the prism height b is relatively large with respect to the prism pitch a. Further, if the angle of spread of the incident light from the light source 3 is increased with the same linear Fresnel lens pattern, the portion farther from the center is used as one segment, so that the prism height at the end of the segment is used. B becomes larger. It is not preferable that the prism height b becomes large because the linear Fresnel lens becomes thick and the angle at which light must be refracted becomes large and the light efficiency decreases.
- the angle at which the light emitted from the light source 3 spreads is set to, for example, approximately 90 ° or less (approximately ⁇ 45 ° or less to approximately + 45 ° or less with respect to the normal direction), and the prism pitch at the end of the segment.
- the prism height b with respect to a is relatively small, and a> b. That is, only the central portion that satisfies a> b is used as one segment.
- the light source 3 such as an LED is also required to have a high brightness.
- many high-brightness LEDs and the like have a narrow angle of light distribution and an angle of spread of emitted light of 90 ° or less. Therefore, in order to reduce the above-mentioned prism height b, the emitted light from the light source 3 is emitted. It is convenient to narrow the angle of spread of.
- the linear Fresnel lens can be made thinner by setting the angle of spread of the emitted light of the light source 3 to approximately 90 ° or less so that the prism pitch a and the prism height b satisfy a> b. At the same time, it is possible to improve the light efficiency and further increase the brightness.
- a substrate in which a plurality of light sources are arranged in a two-dimensional manner in a grid pattern and a groove formed on an uneven surface of the lens are arranged on the emission side of the plurality of light sources.
- some of the performances and functions such as high brightness, high contrast, high brightness uniformity, low power consumption, thinness, and support for local dimming can be satisfied at the same time.
- the two orthogonal linear Fresnel lenses efficiently collimate to substantially parallel light and light whose optical axis is arbitrarily tilted, high brightness and high brightness uniformity can be realized.
- local dimming can be supported by a plurality of light sources arranged two-dimensionally in a grid pattern, and high contrast can be realized.
- high brightness can be realized, low power consumption can be realized for the same level of brightness as the conventional one.
- by using a linear Fresnel lens it is possible to realize a thin shape.
- the first linear Fresnel lens is provided corresponding to one of the rows or columns of a plurality of light sources arranged two-dimensionally in a grid pattern, and the second linear Fresnel lens corresponds to the other of the rows or columns. Is provided.
- forming a linear Fresnel lens in columns or rows for multiple light sources arranged in a straight line is more effective than forming an annular Fresnel lens for each light source. , It can be easily manufactured, and cost reduction can be realized.
- a condenser lens in which a first linear Fresnel lens is provided on one surface and a second linear Fresnel lens is provided on the other surface.
- the first linear Fresnel lens and the second linear Fresnel lens can be realized with one condenser lens, and the structure can be simplified.
- first condenser lens provided with a first linear Fresnel lens on one surface and a second condenser lens provided with a second linear Fresnel lens on the other surface. This makes it easier to manufacture.
- one of the first linear Frenel lens and the second Linear Frenel lens collects light substantially in parallel in the horizontal direction and in the cross section along the normal direction of the emission surface during use, and the first linear is used.
- the other of the Frenel lens or the second linear Frenel lens collects light substantially parallel in the vertical direction and along the normal direction of the exit surface during use. This makes it possible to efficiently focus on parallel light.
- one of the first linear Frenel lens and the second Linear Frenel lens collects light substantially in parallel in the cross section along the horizontal direction and the normal direction of the emission surface during use, and the first linear lens is used.
- the other of the Frenel lens or the second linear Frenel lens tilts the optical axis outward in the vertical direction in use according to the distance from the center in the vertical direction in use, and either the incident side or the exit side of the field lens. Diffuses light in the horizontal direction during use with a lenticular lens and within the cross section along the normal direction of the exit surface, and the incident side or the exit side of the field lens is the horizontal center during use with a linear prism.
- the optical axis is tilted outward in the horizontal direction during use according to the distance from the lens.
- the horizontal optical axis when the horizontal optical axis is greatly tilted during use, it can be tilted reasonably in two stages, with respect to the concave mirror of the head-up display system in which the light of the planar lighting device is used. It is possible to supply light with appropriate optical axis control. Further, it is possible to diffuse only the light in the horizontal direction at the time of use in which the luminance uniformity of the virtual image becomes a problem with respect to the movement of the line of sight, and it is possible to enhance the luminance uniformity of the virtual image.
- the contact angle at the end of the R shape of the lenticular lens becomes larger toward the outside with respect to the center in the horizontal direction during use.
- one of the first linear Fresnel lens and the second linear Fresnel lens tilts the optical axis outward in the horizontal direction in use according to the distance from the center in the horizontal direction in use, and the first linear lens is used.
- the other of the Fresnel lens or the second linear Fresnel lens is tilted outward in the vertical direction in use depending on the distance from the center in the vertical direction in use.
- a first lenticular lens is provided on one surface, which is arranged on the emission side of the second linear Fresnel lens, and a groove forming the concave-convex surface of the lens extends in one direction, and the concave-convex surface of the lens is provided on the other surface.
- a second field lens is provided with a second lenticular lens in which the grooves constituting the lens extend in a direction orthogonal to one direction.
- a first lenticular lens is provided on one surface, which is arranged on the emission side of the second linear Fresnel lens, and a groove forming the concave-convex surface of the lens extends in one direction, and the concave-convex surface of the lens is provided on the other surface.
- a second lenticular lens is provided in which the grooves constituting the lens extend in a direction orthogonal to one direction, and a third field lens in which one or both surfaces are concave is provided.
- the optical axis is tilted to the outside in the horizontal direction at the time of use according to the horizontal distance at the time of use from the center of the planar lighting device.
- the emission side of the field lens is provided on the emission side of the field lens and has minute dots that diffuse the emitted light. This makes it possible to improve the uniformity of brightness.
- It also has a reflector that is placed between the substrate and the first linear Fresnel lens and has a reflective surface that surrounds each of the plurality of light sources. As a result, the loss of light from the light source can be reduced, and even higher brightness can be realized.
- the angle of spread of the emitted light of the light source is set to about 90 ° or less, and the prism pitch a and the prism height b of the linear Fresnel lens are set to a> b.
- the prism pitch a and the prism height b of the linear Fresnel lens are set to a> b.
- the present invention is not limited to the above embodiments.
- the present invention also includes a configuration in which the above-mentioned components are appropriately combined. Further, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.
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Abstract
Description
図1は、ヘッドアップディスプレイシステム100の構成例を示す図である。図1において、自動車に搭載されるヘッドアップディスプレイシステム100の場合、自動車の進行方向は図における左方向(Y軸の正方向)である。
図2は、第1の実施形態にかかる面状照明装置1の正面図である。便宜上、面状照明装置1の発光面がX-Y平面内にあり、面状照明装置1の厚み方向をZ方向としている。また、ヘッドアップディスプレイ用の照明としてスクリーン等に反射されて利用者から見える使用状態においては、既に図1において示されたように、X軸方向が水平方向(H)に対応し、Y軸方向が垂直方向(V)に対応する。なお、以下では、スクリーン等に反射されて利用者から見える使用状態における水平方向を単に「水平方向」と記載し、スクリーン等に反射されて利用者から見える使用状態における垂直方向を単に「垂直方向」と記載する場合がある。
図3で示された第1の実施形態では、コンデンサレンズ5を通ってほぼ平行とされた光がフィールドレンズ6によって水平方向に配光が調整されるものであったが、コンデンサレンズ5の出射光の配光が狭すぎる場合、輝度均一性が悪化する場合がある。すなわち、中心部分に比べ、周辺部の輝度が低下し過ぎてしまう場合がある。そこで、第2の実施形態では、コンデンサレンズ5の出射光の水平方向および垂直方向の配光を広げるようにしている。
第3の実施形態は、第2の実施形態が改良されたものであり、第2の実施形態(図14)におけるフィールドレンズ61、62の主要な機能を1つのフィールドレンズ63で実現し、主要な部品の点数削減を行いやすくしたものである。
第4の実施形態は、1枚目のコンデンサレンズ5の入射側の面5aで水平方向について略平行光への集光を行い、出射側の面5bで垂直方向について集光と光軸の傾斜とを行い、2枚目のフィールドレンズ6の入射側の面6aで水平方向について光の拡散を行い、出射側の面6bで水平方向について光軸の傾斜を行うようにしている。図1のヘッドアップディスプレイシステム100では、垂直方向よりも水平方向の光軸の傾斜が大きくなるが、水平方向について2段階に分けて無理なく傾斜させることができ、面状照明装置の光が利用されるヘッドアップディスプレイシステムの凹面鏡に対して適切な光軸の制御が行われた光を供給することができる。すなわち、一面のリニアフレネルレンズによってLED等の光源3毎の集光と、光軸の大きな傾斜とを実現することは構造上困難であるが、いったん略平行光の集光させた後にリニアプリズムによって光軸の傾斜を行うことで、実現が容易になる。また、水平方向について光の拡散を行うが、垂直方向については必要とされる配光の広がり角が狭く拡散を必要としない場合が多いため、垂直方向の拡散をしない構成としている。
第5の実施形態は、1枚目のコンデンサレンズ5の入射側の面5aで水平方向について集光と光軸の傾斜とを行い、出射側の面5bで垂直方向について集光と光軸の傾斜とを行い、2枚目のフィールドレンズ6の入射側の面6aで水平方向について光の拡散を行い、出射側の面6bで垂直方向について光の拡散を行うようにしている。これにより、フィールドレンズ6に入る前のコンデンサレンズ5の段階において光軸の傾斜を完了することができ、フィールドレンズ6の機能を光の拡散だけとして、構成を簡略化することができる。
次に、前述した各実施形態で使用されるリニアフレネルレンズのプリズムピッチに対するプリズム高さを相対的に低くする工夫について説明する。図29は、光源3の出射光の広がりの角度とプリズムピッチおよびプリズム高さとの関係の例を示す図である。図29において、基板2上に配置された1つの光源3から、所定の角度の広がりの配光で光が出射し、コンデンサレンズ5の面5aに形成されたリニアフレネルレンズの1セグメント分の領域内に光が入射する様子を示している。また、リニアフレネルレンズの一部のプリズムが拡大して示されており、プリズムピッチがa、プリズム高さがbとなっている。
Claims (15)
- 複数の光源が格子状に2次元に配置された基板と、
前記複数の光源の出射側に配置され、レンズの凹凸面を構成する溝が一の方向に延びる第1のリニアフレネルレンズと、
前記第1のリニアフレネルレンズの出射側に配置され、レンズの凹凸面を構成する溝が前記一の方向と直交する方向に延びる第2のリニアフレネルレンズと、
を備える面状照明装置。 - 前記第1のリニアフレネルレンズは、格子状に2次元に配置された前記複数の光源の行または列の一方に対応して設けられ、
前記第2のリニアフレネルレンズは、前記行または列の他方に対応して設けられる、
請求項1に記載の面状照明装置。 - 一方の面に前記第1のリニアフレネルレンズが設けられ、他方の面に前記第2のリニアフレネルレンズが設けられる、コンデンサレンズ、
を備える請求項1または2に記載の面状照明装置。 - 一方の面に前記第1のリニアフレネルレンズが設けられる第1のコンデンサレンズと、
いずれかの面に前記第2のリニアフレネルレンズが設けられる第2のコンデンサレンズと、
を備える請求項1または2に記載の面状照明装置。 - 前記第1のリニアフレネルレンズまたは前記第2のリニアフレネルレンズの一方は、使用時における水平方向および出射面の法線方向に沿った断面内において光を略平行に集光し、
前記第1のリニアフレネルレンズまたは前記第2のリニアフレネルレンズの他方は、使用時における垂直方向および出射面の法線方向に沿った断面内において光を略平行に集光する、
請求項1~4のいずれか一つに記載の面状照明装置。 - 前記第2のリニアフレネルレンズの出射側に配置され、配光を変えるフィールドレンズ、
を備える請求項1~5のいずれか一つに記載の面状照明装置。 - 前記第1のリニアフレネルレンズまたは前記第2のリニアフレネルレンズの一方は、使用時における水平方向および出射面の法線方向に沿った断面内において光を略平行に集光し、
前記第1のリニアフレネルレンズまたは前記第2のリニアフレネルレンズの他方は、使用時における垂直方向の中心からの距離に応じて光軸を使用時における垂直方向の外側に傾斜させ、
前記フィールドレンズの入射側または出射側の一方は、レンチキュラーレンズにより使用時における水平方向および出射面の法線方向に沿った断面内において光を拡散させ、
前記フィールドレンズの入射側または出射側の他方は、リニアプリズムにより使用時における水平方向の中心からの距離に応じて光軸を使用時における水平方向の外側に傾斜させてある、
請求項6に記載の面状照明装置。 - 前記レンチキュラーレンズのR形状の端部における接触角は、使用時における水平方向の中心部に対して外側ほど大きくなる、
請求項7に記載の面状照明装置。 - 前記第1のリニアフレネルレンズまたは前記第2のリニアフレネルレンズの一方は、使用時における水平方向の中心からの距離に応じて光軸を使用時における水平方向の外側に傾斜させ、
前記第1のリニアフレネルレンズまたは前記第2のリニアフレネルレンズの他方は、使用時における垂直方向の中心からの距離に応じて光軸を使用時における垂直方向の外側に傾斜させてある、
請求項1~6のいずれか一つに記載の面状照明装置。 - 前記第2のリニアフレネルレンズの出射側に配置され、一方の面にレンズの凹凸面を構成する溝が一の方向に延びる第1のレンチキュラーレンズが設けられ、他方の面にレンズの凹凸面を構成する溝が前記一の方向と直交する方向に延びる第2のレンチキュラーレンズが設けられる第2のフィールドレンズ、
を備える請求項1~6のいずれか一つに記載の面状照明装置。 - 前記第2のリニアフレネルレンズの出射側に配置され、一方の面にレンズの凹凸面を構成する溝が一の方向に延びる第1のレンチキュラーレンズが設けられ、他方の面にレンズの凹凸面を構成する溝が前記一の方向と直交する方向に延びる第2のレンチキュラーレンズが設けられ、いずれか一方または両方の面が凹状とされる第3のフィールドレンズ、
を備える請求項1~4のいずれか一つに記載の面状照明装置。 - 前記フィールドレンズは、前記面状照明装置の中心からの使用時における水平方向の距離に応じて光軸を使用時における水平方向の外側に傾斜させてある、
請求項6に記載の面状照明装置。 - 前記フィールドレンズの出射側に設けられ、出射光を拡散させる微小なドット、
を備える請求項6に記載の面状照明装置。 - 前記基板と前記第1のリニアフレネルレンズとの間に配置され、前記複数の光源の個々を囲む反射面を有するリフレクタ、
を備える請求項1~13のいずれか一つに記載の面状照明装置。 - 前記光源の出射光の広がりの角度は略90°以下に設定され、前記リニアフレネルレンズのプリズムピッチaおよびプリズム高さbはa>bに設定される、
請求項1~14のいずれか一つに記載の面状照明装置。
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EP21830915.1A EP4177513A1 (en) | 2020-07-01 | 2021-02-08 | Planar illumination device |
CN202180045848.4A CN115769020A (zh) | 2020-07-01 | 2021-02-08 | 面状照明装置 |
KR1020227003931A KR102453742B1 (ko) | 2020-07-01 | 2021-02-08 | 면 형상 조명 장치 |
JP2021563602A JP7016456B1 (ja) | 2020-07-01 | 2021-02-08 | 面状照明装置 |
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WO2023157501A1 (ja) * | 2022-02-16 | 2023-08-24 | ミネベアミツミ株式会社 | 面状照明装置 |
WO2024034296A1 (ja) * | 2022-08-09 | 2024-02-15 | ミネベアミツミ株式会社 | 面状照明装置 |
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JPWO2022004036A1 (ja) | 2022-01-06 |
KR102453742B1 (ko) | 2022-10-14 |
US20230213167A1 (en) | 2023-07-06 |
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KR20220028117A (ko) | 2022-03-08 |
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