WO2014196048A1 - Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage - Google Patents

Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage Download PDF

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Publication number
WO2014196048A1
WO2014196048A1 PCT/JP2013/065665 JP2013065665W WO2014196048A1 WO 2014196048 A1 WO2014196048 A1 WO 2014196048A1 JP 2013065665 W JP2013065665 W JP 2013065665W WO 2014196048 A1 WO2014196048 A1 WO 2014196048A1
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WIPO (PCT)
Prior art keywords
optical lens
optical
light
sub
incident surface
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Application number
PCT/JP2013/065665
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English (en)
Japanese (ja)
Inventor
一廣 村松
秀樹 大柴
晃由 若藤
広司 藤森
Original Assignee
クイックディール・リミテッド
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Application filed by クイックディール・リミテッド filed Critical クイックディール・リミテッド
Priority to PCT/JP2013/065665 priority Critical patent/WO2014196048A1/fr
Publication of WO2014196048A1 publication Critical patent/WO2014196048A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • 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]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the present invention relates to an optical lens, an optical module, a backlight assembly, and a display device.
  • a liquid crystal display is known as a kind of display device.
  • a liquid crystal display device is a device that displays an image using a liquid crystal substance, and can be made thinner and lighter and consumes less power than a CRT display device that has been widely used in the past. In recent years, it has been rapidly spreading.
  • the liquid crystal material (or the liquid crystal panel using the liquid crystal material) itself does not emit light, so that a separate light source for supplying light is required.
  • Many liquid crystal display devices currently in use use fluorescent lamp-type light sources, but light-emitting diode (LED) -type light sources are increasingly used in order to achieve even lower power consumption. .
  • a light source of a light emitting diode system is called a uniform diffusion surface light source, and emits light with a so-called Lambertian light distribution. Therefore, when used as a light source as it is, it is necessary per unit area of a liquid crystal display device due to the narrow illumination range. The number of light sources increases.
  • FIG. 24 is a cross-sectional view for explaining a conventional optical lens 910.
  • Reference numeral 900 denotes an optical module including a light source 920 made of a light emitting diode and an optical lens 910.
  • the conventional optical lens 910 is an optical lens that expands the illumination range of light emitted from the light source 920 by using the optical lens 910 disposed on the emission side of the light source 920. Having a concave shape surrounding the light source 920 when the light source 920 is disposed on the light emission side of the light source 920, and an incident surface 912 having a predetermined first outer diameter, and a second having a convex shape and larger than the first outer diameter.
  • An exit surface 914 having an outer diameter and a bottom surface 916 positioned between the outer peripheral end of the incident surface 912 and the outer peripheral end of the exit surface 914 are provided.
  • the bottom surface 916 includes a first flat surface portion 917 that abuts on a light source base 922 that supplies power to the light source 920 and a second flat surface portion 918 that is one step lower than the first flat surface portion 917.
  • the light emitted from the light source 920 is refracted by the incident surface 912 and the emission surface 914, and the illumination range is expanded as compared with the case where the light is emitted from the light source 920.
  • the light illumination range can be expanded and the number of light sources required per unit area can be reduced as compared with the case where a light source (particularly a light source composed of a light emitting diode) is used as it is. It becomes.
  • the conventional optical lens such as the optical lens 910
  • the optical module when used as described above, light is incident nonuniformly on the optical element in the subsequent stage (specifically, In this case, a large amount of light is incident on a ring-shaped narrow region centered on the optical axis (see, for example, a comparative example to be described later and FIG. 16), an optical element in the subsequent stage (in the case of a liquid crystal display device, a light source)
  • a light guide member that guides light from the light source
  • a diffusion member that diffuses light from the light source.
  • the present invention has been made to solve the above-described problems.
  • an optical module When an optical module is used, it is possible to supply light with higher uniformity to the optical element at the subsequent stage than a conventional optical lens. It is an object to provide a simple optical lens. It is another object of the present invention to provide an optical module including the optical lens of the present invention and capable of supplying light with higher uniformity to a subsequent optical element than a conventional optical module. It is another object of the present invention to provide a backlight assembly that includes the optical module of the present invention and can supply high-quality light. It is another object of the present invention to provide a display device that includes the backlight assembly of the present invention and can display a beautiful image using high-quality light.
  • the inventors of the present invention have made extensive studies on the problem that light is incident unevenly on the optical elements in the subsequent stage in the conventional optical lens. As a result, light is incident on an angle (see reference numeral 919 in FIG. 24) that exists at the boundary portion between the incident surface and the bottom surface of the optical lens, and the light incident on the angle is a specific area ( The inventors have found that a large amount of light incident on a ring-shaped narrow region centered on the optical axis is the cause of the above problem (for details, refer to a comparative example described later).
  • the present invention has been made on the basis of the above findings, and comprises the following elements.
  • the optical lens of the present invention is an optical lens that expands an illumination range of light emitted from the light source by being used in a state of being arranged on the light emission side of the light source, and the optical lens is emitted from the light source.
  • An incident surface having a concave shape surrounding the light source when disposed on the side and having a predetermined first outer diameter D1, and an emission surface having a second outer diameter D2 larger than the first outer diameter D1
  • a bottom surface located in a region between an outer peripheral end of the incident surface and an outer peripheral end of the exit surface, and a sub-incident surface that smoothly connects the incident surface and the bottom surface.
  • the optical lens of the present invention since the sub-incident surface that smoothly connects the incident surface and the bottom surface is provided, the corner of the boundary portion between the incident surface and the bottom surface of the optical lens is eliminated, and the incident surface and the bottom surface of the optical lens are removed.
  • the corner of the boundary portion between the incident surface and the bottom surface of the optical lens is eliminated, and the incident surface and the bottom surface of the optical lens are removed.
  • the optical lens of the present invention when the optical lens is disposed on the light exit side of the light source, the optical lens has a concave shape that surrounds the light source and has a predetermined first outer diameter D1, and the first outer surface. And an emission surface having a second outer diameter D2 larger than the diameter, the illumination range of the light emitted from the light source is expanded, and the number of light sources required per unit area is reduced as in the case of the conventional optical lens. It becomes possible.
  • the change in shape from the conventional optical lens is relatively small, and it is not necessary to increase the size of the optical lens. This can be used particularly effectively when the range is further expanded to further reduce the number of light sources required per unit area.
  • the “concave shape” may be a concave shape as a whole.
  • the shape is preferably a continuous curved surface, but may be a shape including a plane, a protrusion, a dent, etc. in a part (particularly in the vicinity of the optical axis).
  • the region where the bottom surface is located is a region including from the outer peripheral end of the incident surface to the outer peripheral end of the exit surface on the surface of the optical lens.
  • “Smoothly connecting the incident surface and the bottom surface” means that the boundary between the incident surface and the sub incident surface, the sub incident surface itself, and the boundary between the sub incident surface and the bottom surface are all smooth. From a different point of view, there are no corners or steps on the boundary between the incident surface and the sub incident surface, the sub incident surface itself, and the boundary between the sub incident surface and the bottom surface. If the target surface for determining whether or not the connection is smooth is a rough surface, the above determination is made assuming that the surface is not a rough surface but a smooth surface. This is because, in designing an optical lens, whether or not a certain surface is a rough surface is usually studied after determining the main surface shape.
  • a sub-incidence surface may consist of a curved surface which has a single curvature radius, and the composite curved surface which combined the curved surface from which a curvature radius differs, or a free curved surface ( It may also be a curved surface with a gradually changing radius of curvature.) Or a surface combining a curved surface and a flat surface.
  • the above-described present invention can be suitably applied to both the case of using an exit surface having a convex shape and the case of using an exit surface having a concave shape in an optical lens.
  • the “convex shape” mentioned above may be a convex shape as a whole, and is preferably a shape consisting of a continuous curved surface, but a shape including a plane, a protrusion, a dent, etc. in part (particularly near the optical axis). It may be.
  • the curvature radius of the portion with the smallest curvature radius on the sub-incident surface is in the range of 0.05 mm to 1.00 mm.
  • the minimum radius of curvature hereinafter sometimes referred to as the minimum radius of curvature
  • the curvature of the sub-incident surface is too large to sufficiently disperse incident light.
  • the sub-incidence surface becomes too large, so that the area of the incident surface cannot be taken sufficiently, and it may be difficult to sufficiently expand the illumination range.
  • the optical lens of the present invention by adopting the configuration as described above, it is possible to sufficiently disperse incident light and sufficiently expand the illumination range.
  • the minimum radius of curvature is larger than 1.00 mm, more light is incident on the sub-incident surface rather than the incident surface, so that light is refracted on the exit surface. May not be successful and it may be difficult to provide highly uniform light. Also from the above viewpoint, it is preferable that the minimum curvature radius is smaller than 1.00 mm.
  • the radius of curvature of the portion having the smallest radius of curvature on the sub-incident surface is in the range of 0.20 mm to 0.50 mm. More preferably, it is within the range of 0.30 mm to 0.40 mm (see Examples described later).
  • Minimum curvature radius is measured based on a plan view of the sub-incident surface as a cross section including the optical axis of the optical lens.
  • the length L1 of the sub-incident surface along the optical axis of the optical lens and the length L2 of the incident surface along the optical axis of the optical lens are expressed as follows: It is preferable that “0.04 ⁇ L1 ⁇ L2 ⁇ 0.12” is satisfied.
  • the curvature of the sub-incident surface may be too large to disperse incident light sufficiently, and if “L1 ⁇ L2> 0.12”, the sub-incident In some cases, the surface becomes too large to take a sufficient area of the incident surface, and it is difficult to sufficiently expand the illumination range.
  • the optical lens of the present invention by adopting the configuration as described above, it is possible to sufficiently disperse incident light and sufficiently expand the illumination range.
  • the first outer diameter D1 and the third outer diameter D3, which is the outer diameter of the sub-incident surface are expressed by the formula “0.70 ⁇ D1 ⁇ D3 ⁇ 0.95”. It is preferable to satisfy.
  • the curvature of the secondary incident surface may be too large to sufficiently disperse the incident light. If “0.70> D1 ⁇ D3”, the secondary incident may occur. In some cases, the surface becomes too large to take a sufficient area of the incident surface, and it is difficult to sufficiently expand the illumination range.
  • the optical lens of the present invention by adopting the configuration as described above, it is possible to sufficiently disperse incident light and sufficiently expand the illumination range.
  • the radius of curvature R of the portion with the smallest radius of curvature on the sub-incident surface and the second outer diameter D2 are expressed by the equation “0.01 ⁇ R ⁇ D2 ⁇ 0.10. "Is preferably satisfied.
  • the curvature of the sub-incident surface may be too large to sufficiently disperse incident light. If R ⁇ D2> 0.10, the sub-incident surface is not sufficient. In some cases, it becomes too large to take a sufficient area of the incident surface, and it is difficult to sufficiently expand the illumination range.
  • the optical lens of the present invention by adopting the configuration as described above, it is possible to sufficiently disperse incident light and sufficiently expand the illumination range.
  • the sub-incident surface is a smooth surface.
  • “Smooth surface” follows common general technical knowledge in the field and purpose of using optical lenses. For example, in the case of an optical lens used with a light emitting diode, a surface having an average surface roughness of 50 ⁇ m or less can be a smooth surface.
  • the sub incident surface when viewed along a direction parallel to the optical axis of the optical lens, is closer to the exit surface than the boundary line between the sub incident surface and the bottom surface. It is preferable that it exists in.
  • the sub-incident surface does not protrude toward the light source side, and an optical lens that can be easily used as an optical module can be obtained.
  • the exit surface has a convex shape, and is a direction parallel to the optical axis of the optical lens, the direction from the exit surface toward the entrance surface being a first direction.
  • the bottom surface has an inclined portion that inclines toward the first direction as the distance from the optical axis of the optical lens increases.
  • the inventors of the present invention have made extensive studies as described above, and the light reflected without being emitted from the exit surface is further reflected on the bottom surface. The knowledge that it becomes a cause of light entering into a narrow region of was obtained. Then, further research was repeated and the structure for solving the said problem was invented.
  • the bottom surface has an inclined portion that inclines toward the first direction as it moves away from the optical axis of the optical lens, so that the light reflected by the exit surface is centered on the optical axis.
  • the spatial distance is 30 mm or more. I need it.
  • the research of the inventors of the present invention when including the invention of [8] above, it is possible to reduce the spatial distance to 15 mm or less even if the arrangement of the optical modules is the same. It turns out that there is.
  • the bottom surface further includes a plane portion formed of a plane perpendicular to the optical axis of the optical lens, and the plane portion is in contact with an outer peripheral end of the sub incident surface.
  • the inclined part is preferably located on the outer peripheral side of the flat part.
  • the inclined portion is positioned on the outer peripheral side where it is considered that a relatively large amount of light reflected by the exit surface arrives. Even if the ratio occupied by is relatively small, it is possible to alleviate the concentration of light reflected by the exit surface in a ring-shaped narrow region centered on the optical axis.
  • the inclined portion is in contact with the outer peripheral end of the sub-incident surface and in contact with the outer peripheral end of the exit surface.
  • the bottom surface further includes a first flat surface portion and a second flat surface portion which are planes perpendicular to the optical axis of the optical lens, and the first flat surface portion is The second flat surface portion is in contact with the outer peripheral edge of the sub-incidence surface, the second flat surface portion is in contact with the outer peripheral edge of the emission surface, and the inclined portion is located between the first flat surface portion and the second flat surface portion.
  • the inclined portion is positioned on the outer peripheral side where it is considered that a relatively large amount of reflected light reflected by the exit surface arrives, and the outermost periphery of the bottom surface is a second flat surface. Since it is a flat part, when it is an optical module, the light reflected by the exit surface is concentrated in a ring-shaped narrow area centering on the optical axis, making it easy to install the optical lens on a circuit board or the like. It is possible to alleviate this.
  • the term “in contact with the outer peripheral edge of the sub-incident surface” for the flat portion, the first flat portion, and the inclined portion described in the above [9] to [11] means that each portion and the outer peripheral end of the incident surface. Is in contact.
  • each portion and the outer peripheral edge of the injection surface are completely in contact, but also each portion and the outer peripheral edge of the injection surface. This includes cases where they are substantially in contact (for example, where each part is in contact with the outer peripheral edge of the exit surface through a step or the like that does not have an optical effect).
  • the inclined portion and the surface in contact with the inclined portion are smoothly connected. Since light emitted from the light source may enter the boundary between the inclined portion and the surface in contact with the inclined portion, the light reflected from the emission surface is centered on the optical axis by adopting the above configuration. It is possible to further alleviate the concentration in a narrow ring-shaped region.
  • the entrance surface, the exit surface, the sub-incidence surface, and the inclined portion have a rotationally symmetric shape, and in a predetermined plane including the optical axis of the optical lens,
  • the surface of the inclined portion is preferably composed of a straight line.
  • “having a rotationally symmetric shape” means that the optical surface through which light passes is designed with reference to the rotationally symmetric shape, and that the entire optical surface is not necessarily completely rotationally symmetric. It doesn't mean that.
  • the surface of the inclined portion is a straight line may be that the surface of the inclined portion as a whole is a straight line (when viewed in cross section). For example, even when a minute rough surface processing or the like is performed on the inclined portion, the case where the inclined portion is a straight line when the rough surface processing is not performed is included in the scope of the present invention.
  • an inclination angle of the inclined portion is in a range of 5 ° to 30 ° with respect to a plane perpendicular to the optical axis of the optical lens.
  • the inclination angle is within the range of 5 ° to 30 ° with respect to the virtual plane. This is because the light is sufficiently concentrated on a specific area when the inclination angle is smaller than 5 °. This is because, when the inclination angle is larger than 30 °, it may be difficult to sufficiently increase the area ratio of the inclined portion when viewed from above. Even when the inclination angle is large, it is possible to increase the area ratio of the inclined portion when viewed from above by increasing the area of the inclined portion itself. However, in this case, the thickness of the optical lens also increases. When an optical lens is used for a display device, if the thickness of the optical lens is increased, the thickness of the display device must be increased. Therefore, the inclination angle is preferably 30 ° or less.
  • the incident surface is a rotationally symmetric aspherical surface.
  • Such a configuration makes it possible to spread light in a rotationally symmetric manner with respect to the optical axis.
  • the incident surface when the cross section of the incident surface is viewed as a curve on a predetermined plane including the optical axis of the optical lens, the incident surface has an inclination of a tangent to the curve only at a point overlapping the optical axis. It is preferable to have a shape that becomes zero.
  • the incident surface when the cross section of the incident surface is viewed as a curve on a predetermined plane including the optical axis of the optical lens, the incident surface is tangent to the optical axis and the optical axis at any location. Are preferably not parallel to each other.
  • the exit surface is a rotationally symmetric aspherical surface.
  • Such a configuration makes it possible to spread light in a rotationally symmetric manner with respect to the optical axis.
  • the exit surface when the cross section of the exit surface is viewed as a curve on a predetermined plane including the optical axis of the optical lens, the exit surface has a slope of a tangent to the curve only at a point overlapping the optical axis. It is preferable to have a shape that becomes zero.
  • the exit surface when the cross section of the exit surface is viewed as a curve on a predetermined plane including the optical axis of the optical lens, the exit surface is tangent to the optical axis and the optical axis at any location. Are preferably not parallel to each other.
  • the surface of the inclined portion is a rough surface.
  • the optical module of the present invention includes a light source that emits light and the optical lens of the present invention.
  • the optical lens of the present invention since the optical lens of the present invention is provided, it becomes possible to supply light with higher uniformity to the optical element in the subsequent stage than the optical module using the conventional optical lens. .
  • the light source is preferably a light emitting diode.
  • the optical lens of the present invention is an optical lens suitable for use with a light source composed of a light emitting diode, in such a case, light with higher uniformity can be supplied.
  • a backlight assembly of the present invention is a circuit board and an optical module disposed on the circuit board, and includes the optical module of the present invention.
  • the optical module of the present invention since the optical module of the present invention is provided, it is possible to supply light of good quality.
  • a display device of the present invention includes the backlight assembly of the present invention and a display panel that displays an image using light supplied from the backlight assembly.
  • the backlight assembly of the present invention since the backlight assembly of the present invention is provided, it is possible to display a beautiful image using high-quality light.
  • FIG. 3 is a perspective view illustrating the backlight assembly 300 according to Embodiment 1.
  • FIG. 3 is an exploded perspective view for explaining the display device 1000 according to the first embodiment. It is a figure shown in order to demonstrate the optical lens 30 which concerns on Embodiment 2.
  • FIG. It is a figure shown in order to demonstrate the optical module 202 which concerns on Embodiment 2.
  • FIG. It is a figure shown in order to demonstrate the optical lens 40 which concerns on Embodiment 3.
  • FIG. It is a figure shown in order to demonstrate the optical lens 50 which concerns on Embodiment 4.
  • FIG. It is a figure shown in order to demonstrate the optical lens 60 which concerns on Embodiment 5.
  • FIG. It is a figure shown in order to demonstrate the optical lens 70 which concerns on Embodiment 6.
  • FIG. It is a figure shown in order to demonstrate the optical lens 80 which concerns on Embodiment 7.
  • FIG. It is a figure shown in order to demonstrate the optical lens 90 which concerns on Embodiment 8.
  • FIG. It is a figure shown in order to demonstrate the optical lens 100 which concerns on Embodiment 9.
  • FIG. It is a figure shown in order to demonstrate the simulation method in a comparative example and Examples 1-5.
  • FIG. 6 is a diagram for explaining the illuminance distribution of light by the optical lens 120 according to the first embodiment.
  • FIG. 6 is a diagram for explaining the illuminance distribution of light by the optical lens 130 according to Example 2. It is a figure shown in order to demonstrate the illumination intensity distribution of the light by the optical lens 140 which concerns on Example 3.
  • FIG. It is a figure shown in order to demonstrate the illumination intensity distribution of the light by the optical lens 150 which concerns on Example 4.
  • FIG. It is a figure shown in order to demonstrate the illumination distribution of the light by the optical lens 160 which concerns on Example 5.
  • FIG. 6 is a diagram for explaining the illuminance distribution of light by the optical lens 120 according to the first embodiment.
  • FIG. 6 is a diagram for explaining the illuminance distribution of light by the optical lens 130 according to Example 2. It is a figure shown in order to demonstrate the illumination intensity distribution of the light by the optical lens 140 which concerns on Example 3.
  • FIG. It is a figure shown in order to demonstrate the illumination intensity distribution of the light by the optical lens
  • FIG. 1 The figure which expands and shows the sub-incidence surface 178 in the optical lens 170 (the whole is not shown) which concerns on the modification 1.
  • FIG. 1 The figure which expands and shows the sub-incidence surface 188 in the optical lens 180 (the whole is not shown) which concerns on the modification 2.
  • FIG. It is sectional drawing shown in order to demonstrate the conventional optical lens 910.
  • FIG. 1 is a diagram for explaining symbols and the like.
  • FIG. 1A is a cross-sectional view showing the entire optical lens 1
  • FIG. 1B is a cross-sectional view showing the incident surface 2 and the sub-incident surface 8 extracted from the optical lens 1. Note that the shape of the optical lens 1 shown in FIG.
  • the dimension indicated by reference sign D1 is the first outer diameter
  • the dimension indicated by reference sign D2 is the second outer diameter
  • the dimension indicated by reference sign D3 is the third outer diameter
  • the dimension indicated by reference numeral L1 is the length L1 of the sub-incident surface 8 along the optical axis ax of the optical lens 1
  • the dimension indicated by reference numeral L2 is incident along the optical axis ax of the optical lens 1.
  • the length of the surface 2 is L2.
  • reference numeral B1 indicates a boundary between the incident surface 2 and the sub incident surface 8
  • reference numeral B2 indicates a boundary between the sub incident surface 8 and the bottom surface 4.
  • FIG. 2 is a diagram for explaining the optical lens 10 according to the first embodiment.
  • 2A is a perspective view of the optical lens 10
  • FIG. 2B is a cross-sectional view of the optical lens 10
  • FIG. 2C is a portion A (sub-incident surface 18) in FIG. 2B. It is a figure which expands and shows the vicinity.
  • FIG. 2 (a) a contour line that cannot be directly seen is indicated by a broken line.
  • FIG. 3 is a diagram for explaining the optical module 200 according to the first embodiment.
  • FIG. 3A is an exploded perspective view of the optical module 200
  • FIG. 3B is a cross-sectional view of the optical module 200.
  • the arrows in FIG. 3 simply represent the path of light incident on the sub-incident surface.
  • reference numeral 310 denotes a circuit board of the backlight assembly 300 described later, and is not a component of the optical module 200.
  • FIG. 4 is a perspective view for explaining the backlight assembly 300 according to the first embodiment.
  • FIG. 5 is an exploded perspective view for explaining the display device 1000 according to the first embodiment.
  • the optical lens 10 is an optical lens that expands the illumination range of light emitted from the light source 20 by using the optical lens 10 arranged on the emission side of the light source 20 (described later).
  • the optical lens includes a leg 11, an incident surface 12, an exit surface 13, a bottom surface 14, a sub-incident surface 18, and an outer peripheral surface 19.
  • the optical lens 10 is made of, for example, an acrylic resin.
  • the optical lens of the present invention may be made of a material other than acrylic resin (for example, polycarbonate resin, epoxy resin, optical glass, etc.).
  • the diameter of the optical lens 10 is 15.50 mm, the thickness including the leg portion 11 is 5.10 mm, and the thickness excluding the leg portion is 4.90 mm.
  • the legs 11 are for fixing the optical lens 10 to the circuit board 310. There are a total of three legs 11 and the diameters are all 1.00 mm.
  • the incident surface 12 has a concave shape that surrounds the light source 20 when the optical lens 10 is disposed on the emission side of the light source 20, and has a predetermined first outer diameter D1 (see FIG. 2B). In the first embodiment, the first outer diameter D1 is 3.51 mm.
  • the incident surface 12 is composed of a rotationally symmetric aspherical surface.
  • the incident surface 12 when the cross section of the incident surface 12 is viewed as a curve in a predetermined plane including the optical axis ax of the optical lens 10, the incident surface 12 has a tangent slope of 0 in the curve only at a point overlapping the optical axis ax.
  • the shape is as follows. Further, when viewed from the same point of view, the tangent to the curved line and the optical axis ax of the incident surface 12 are not parallel in any part.
  • the injection surface 13 has a second outer diameter D2 that is larger than the first outer diameter D1.
  • the second outer diameter D2 is 15.00 mm.
  • the exit surface 13 has a convex shape and is composed of a rotationally symmetric aspherical surface.
  • the exit surface 13 has a tangent slope of 0 in the curve only at a point overlapping the optical axis ax.
  • the shape is as follows. Moreover, when viewed from the same viewpoint, the tangent to the curved line and the optical axis ax are not parallel to each other on the exit surface 13 at any location.
  • the bottom surface 14 is located in a region from the outer peripheral end of the incident surface 12 to the outer peripheral end of the exit surface 13.
  • the bottom surface 14 includes a first plane portion 15 and a second plane portion 16 that are planes perpendicular to the optical axis ax of the optical lens 10.
  • the first flat surface portion 15 is in direct contact with the outer peripheral end of the sub incident surface 18, and the second flat surface portion 16 is in contact with the outer peripheral end of the exit surface 13.
  • the first flat surface portion 15 and the second flat surface portion 16 have rough surfaces (satin surface in the optical lens 10).
  • the average depth in the range up to a diameter of 6.00 mm of the first plane portion 15, the average depth is 84 ⁇ m to 89 ⁇ m, the minimum required draft is 9.5 °, and the diameter of the first plane portion 15 is 6.
  • the average depth In the range of 00 mm to 14.00 mm, the average depth is 8 ⁇ m to 12 ⁇ m and the minimum required draft is 2 °.
  • the average depth In the second flat portion 16, the average depth is 9 ⁇ m to 12 ⁇ m and the minimum required draft is 1.5 °.
  • the satin treatment is done.
  • the sub incident surface 18 smoothly connects the incident surface 12 and the bottom surface 14.
  • the sub-incident surface 18 is a rotationally symmetric curved surface having a single radius of curvature.
  • the sub incident surface 18 is a smooth surface. Further, when viewed along a direction parallel to the optical axis ax of the optical lens 10, the sub incident surface 18 is based on a boundary line between the sub incident surface 18 and the bottom surface 14 (the first flat surface portion 15 in the first embodiment). Is also on the exit surface 13 side.
  • the radius of curvature (minimum curvature radius) R of the portion with the smallest curvature radius on the sub-incidence surface 18 is in the range of 0.10 mm to 1.00 mm. In the first embodiment, the minimum radius of curvature R is 0.30 mm.
  • the length L1 of the sub-incident surface 18 along the optical axis ax of the optical lens 10 and the length L2 of the incident surface 12 along the optical axis of the optical lens are expressed by the equation “0. 04 ⁇ L1 ⁇ L2 ⁇ 0.12 ”is satisfied.
  • the length L1 of the sub incident surface 18 is 0.23 mm
  • the length L2 of the incident surface 12 is 3.27 mm.
  • the value of “L1 ⁇ L2” is about 0.07.
  • the first outer diameter D1 is 3.51 mm
  • the third outer diameter D3 is 3.90 mm.
  • the value of “D1 ⁇ D3” is about 0.9.
  • the radius of curvature (minimum curvature radius) R of the portion with the smallest curvature radius on the sub-incident surface 18 and the second outer diameter D2 are expressed by the equation “0.01 ⁇ R ⁇ D2 ⁇ 0. 10 "is satisfied.
  • the minimum curvature radius R is 0.30 mm
  • the second outer diameter D2 is 15.5 mm.
  • the value of “R ⁇ D2” is about 0.19.
  • each surface which comprises the entrance plane 12, the exit surface 13, the bottom face 14, and the sub entrance plane 18 can be determined by computer simulation, for example.
  • the outer peripheral surface 19 is a curved surface provided between the outer peripheral end of the injection surface 13 and the outer peripheral end of the bottom surface 14 (second flat portion 16).
  • the optical module 200 includes a light source 20 that emits light and the optical lens 10 according to the first embodiment.
  • the distance in the direction along the optical axis ax from the upper end of the light source 20 to the first plane portion 15 can be set to 0.10 mm, for example.
  • the light source 20 is composed of a white light emitting diode. Although the detailed description is omitted, the light source 20 is formed by sealing a light emitting portion disposed on the light source base 22 with a resin containing a phosphor.
  • each optical lens after the second embodiment described later is also designed to correspond to the light source 20 described above, similarly to the optical lens 10 according to the first embodiment.
  • the backlight assembly 300 includes a circuit board 310 and an optical module 200 disposed on the circuit board 310.
  • the arrangement shape, arrangement interval, number, and the like of the optical module 200 can be arbitrarily determined according to the scale of the backlight assembly (or the scale of the display device using the backlight assembly).
  • the arrangement interval of the optical modules 200 is 35 mm to 50 mm
  • the arrangement shape is a rectangular shape of 26 rows and 15 columns
  • the number is 390. 4 and 5, the number of the optical modules 200 and the number of rows of the circuit board 310 are reduced.
  • the display device 1000 includes a backlight assembly 300, a light guide member 400 that guides light from the backlight assembly 300, and light from the light guide member 400.
  • a diffusing member 500 that diffuses and further increases the uniformity of light
  • a display panel 600 that displays an image using light supplied from the backlight assembly 300, and a top chassis 700 that covers other components.
  • the display panel 600 includes a display panel drive circuit 610 that drives the display panel 600.
  • the spatial distance in the display device 1000 is, for example, 10 mm to 27 mm. Note that since the configuration of the entire display device is widely known, in this specification, only optical-related components will be briefly described.
  • the optical lens 10 since the sub-incident surface 18 that smoothly connects the incident surface 12 and the bottom surface 14 is provided, the corner of the boundary portion between the incident surface and the bottom surface of the optical lens is eliminated, and the optical lens 10 is optical.
  • the light is concentrated in a specific area (ring-shaped narrow area centered on the optical axis) of the optical elements in the subsequent stage. It is possible to suppress the incidence, and as a result, when an optical module is formed, light with higher uniformity can be supplied to the optical element at the subsequent stage than the conventional optical lens.
  • the optical lens 10 since the incident surface 12 and the exit surface 13 are provided, the illumination range of light emitted from the light source is expanded and the unit area is the same as in the conventional optical lens. It is possible to reduce the number of light sources required for the operation.
  • the shape change from the conventional optical lens is relatively small, and it is not necessary to increase the size of the optical lens. This is particularly useful when the illumination range of light is further expanded to further reduce the number of light sources required per unit area.
  • the minimum radius of curvature R is in the range of 0.05 mm to 1.00 mm, the incident light is sufficiently dispersed and the illumination range is sufficiently expanded. It becomes possible to do.
  • the length L1 of the secondary incident surface 18 along the optical axis ax of the optical lens 10 and the length of the incident surface 12 along the optical axis ax of the optical lens 10 are described. Since L2 satisfies the mathematical expression “0.04 ⁇ L1 ⁇ L2 ⁇ 0.12,” it is possible to sufficiently disperse the incident light and sufficiently expand the illumination range.
  • the first outer diameter D1 and the third outer diameter D3 that is the outer diameter of the sub incident surface 18 are expressed by the equation “0.70 ⁇ D1 ⁇ D3 ⁇ 0. 95 ”is satisfied, the incident light can be sufficiently dispersed and the illumination range can be sufficiently expanded.
  • the minimum curvature radius R and the second outer diameter D2 satisfy the mathematical expression “0.01 ⁇ R ⁇ D2 ⁇ 0.10”. It is possible to sufficiently disperse and sufficiently expand the illumination range.
  • the sub-incident surface 18 is a smooth surface, so that the sub-incident surface has substantially corners or steps (for example, fine irregularities generated when a rough surface is used). It is possible to prevent the occurrence of light and to supply light with higher uniformity to the optical element in the subsequent stage when the optical module is formed.
  • the secondary incident surface 18 when viewed along the direction parallel to the optical axis ax of the optical lens 10, the secondary incident surface 18 is more than the boundary line between the secondary incident surface 18 and the bottom surface 14. Since it is on the exit surface 13 side, when an optical module is used, the sub-incident surface does not protrude to the light source side, and an optical lens that can be easily used as an optical module can be obtained.
  • the incident surface 12 is formed of a rotationally symmetric aspherical surface, it is possible to spread light in a rotationally symmetrical manner with respect to the optical axis.
  • the exit surface 13 is composed of a rotationally symmetric aspherical surface, it is possible to spread light in a rotationally symmetrical manner with respect to the optical axis.
  • the optical module 200 according to the first embodiment includes the optical lens 10 according to the first embodiment, the optical module 200 according to the first embodiment supplies light with higher uniformity than the optical module using the conventional optical lens to the subsequent optical element. Is possible.
  • the light source 20 is made of a light emitting diode, it is possible to achieve further reduction in power consumption.
  • the optical lens 10 according to the first embodiment is an optical lens suitable for use with a light source composed of a light-emitting diode, and therefore can supply light with higher uniformity. It becomes possible.
  • the backlight assembly 300 according to the first embodiment includes the optical module 200 according to the first embodiment, it is possible to supply high-quality light.
  • the display device 1000 according to the first embodiment includes the backlight assembly 300 according to the first embodiment, it is possible to display a beautiful image using high-quality light.
  • FIG. 6 is a diagram for explaining the optical lens 30 according to the second embodiment.
  • 6A is a perspective view of the optical lens 30, and
  • FIG. 6B is a cross-sectional view of the optical lens 30.
  • FIG. 7 is a view for explaining the optical module 202 according to the second embodiment. .
  • FIG. 7A is an exploded perspective view of the optical module 202
  • FIG. 7B is a cross-sectional view of the optical module 202.
  • the arrows in FIG. 7 simply represent the path followed by the light reflected by the exit surface.
  • 7B is a circuit board of the backlight assembly 302 (not shown), and is not a component of the optical module 202.
  • the optical lens 30 according to the second embodiment basically has the same configuration as that of the optical lens 10 according to the first embodiment, except that the bottom surface has an inclined portion in the case of the optical lens 10 according to the first embodiment.
  • the components having the same configuration as the optical lens 10 according to the first embodiment are the same as those in the first embodiment. Reference numerals are given, and descriptions in the following text are omitted.
  • the optical lens 30 is an optical lens including a leg portion 11, an incident surface 12, an exit surface 13, a bottom surface 34, and a sub incident surface 18.
  • the bottom surface 34 has a first plane part 35, an inclined part 36 and a second plane part 37.
  • the first flat surface portion 35, the inclined portion 36, and the second flat surface portion 37 are rough surfaces (satin texture in the optical lens 30), and although the detailed illustration is omitted, the diameter of the first flat surface portion 35 is 6.00 mm.
  • the average depth is 84 ⁇ m to 89 ⁇ m, the minimum required draft is 9.5 °, and the average depth is 8 ⁇ m to 14.00 mm in the range of the first flat portion 35 having a diameter of 6.00 mm to 14.00 mm.
  • the satin treatment is performed at 12 ⁇ m with a minimum required draft of 2 °, and with respect to the inclined portion 36 and the second plane portion 37 with an average depth of 9 ⁇ m to 12 ⁇ m and a minimum required draft of 1.5 °.
  • the first plane portion 35 is a plane perpendicular to the optical axis of the optical lens 10 and is in contact with the outer peripheral end of the sub incident surface 18.
  • the first planar portion 35 has an inner diameter of 3.90 mm and an outer diameter of 12.00 mm when viewed as an annular region centered on the optical axis.
  • the second plane portion 37 is a plane perpendicular to the optical axis of the optical lens 10 and is in contact with the outer peripheral end of the exit surface 13. When viewed as an annular region centered on the optical axis, the second planar portion 37 has an inner diameter of 14.00 mm and an outer diameter of 15.50 mm.
  • the inclined portion 36 is in a direction parallel to the optical axis ax of the optical lens 10, and when the direction from the exit surface 13 toward the entrance surface 12 is a first direction, the inclined portion 36 becomes first as the distance from the optical axis ax of the optical lens 10 increases. Inclined toward the direction.
  • the inclined part 36 is located between the first flat part 35 and the second flat part 37.
  • the surface (1st plane part 35 and 2nd plane part 37) which touches the inclination part 36 and the inclination part 36 is connected smoothly.
  • the inclined part 36 has an inner diameter of 12.00 mm and an outer diameter of 14.00 mm when viewed as an annular region centered on the optical axis. Moreover, the height of the inclined part 36 is 0.50 mm.
  • the inclined portion 36 is a straight line.
  • the inclination angle of the inclined portion 36 is in the range of 5 ° to 30 ° with respect to a plane perpendicular to the optical axis of the optical lens, and is, for example, about ° 26.6.
  • the shape of the inclined portion 36 can be determined by computer simulation, for example.
  • the optical module 202 according to the second embodiment has the same configuration as the optical module 200 according to the first embodiment except that an optical lens 30 is provided, and thus detailed description thereof is omitted.
  • the inclined portion 36 further reflects the light reflected by the exit surface 13.
  • the optical lens 30 according to the second embodiment is different from the optical lens 10 according to the first embodiment in that the bottom surface has an inclined portion, but the sub-incident surface smoothly connects the incident surface 12 and the bottom surface 34. Since the surface 18 is provided, similarly to the optical lens 10 according to the first embodiment, the light incident on the boundary portion between the incident surface and the bottom surface of the optical lens is eliminated by eliminating the corner of the boundary surface between the incident surface and the bottom surface of the optical lens. Is distributed outside and the light can be prevented from being incident on a specific area (ring-shaped narrow area centered on the optical axis) in the subsequent optical element. When the optical module is used, it is possible to supply light with higher uniformity to the optical element at the subsequent stage than the conventional optical lens.
  • the bottom surface 34 has the inclined portion 36 that is inclined toward the first direction side as it is away from the optical axis ax of the optical lens 10, and thus is reflected by the exit surface. It is possible to alleviate the concentration of light in a ring-shaped narrow region centered on the optical axis. As a result, when an optical module is used, it is more effective for the optical elements at the later stage than the conventional optical lens. Therefore, it becomes possible to supply light with higher uniformity.
  • the bottom surface 34 has the first flat surface portion 35 and the second flat surface portion 37, and the first flat surface portion 35 is in contact with the outer peripheral end of the sub incident surface 18, and Since the two plane portions 37 are in contact with the outer peripheral end of the exit surface 13 and the inclined portion 36 is located between the first plane portion 35 and the second plane portion 37, the reflected light reflected by the exit surface is compared.
  • the outermost periphery of the bottom surface is the second flat surface portion made of a flat surface, so when an optical module is used, it is easy to install an optical lens on a circuit board or the like In this way, it is possible to reduce the concentration of the light reflected by the exit surface in a narrow ring-shaped region centered on the optical axis.
  • the optical lens 30 according to the second embodiment since the inclined portion 36 and the surfaces in contact with the inclined portion (the first flat surface portion 35 and the second flat surface portion 37) are smoothly connected, they are reflected on the exit surface. It is possible to further alleviate the concentration of the emitted light in a ring-shaped narrow region centered on the optical axis.
  • the inclined portion 36 is a straight line on a predetermined plane including the optical axis ax of the optical lens 30, the inclined portion is inclined non-linearly.
  • the design and processing can be made simpler than the case, and the cost of the optical lens can be reduced.
  • the inclination angle of the inclined portion 36 is within a range of 5 ° to 30 ° with respect to a plane perpendicular to the optical axis ax of the optical lens 30, so that the light is specified. It is possible to sufficiently alleviate the concentration in the region, and the area ratio of the inclined portion when viewed from above can be made sufficiently wide.
  • the surface of the inclined portion 36 is a rough surface, light reflected by the inclined portion can be scattered.
  • the optical lens 30 according to the second embodiment has the same configuration as the optical lens 10 according to the first embodiment except that the bottom surface includes an inclined portion. Has the relevant effect as it is.
  • the optical module 202 according to the second embodiment is different from the optical module 200 according to the first embodiment in that the optical module 202 according to the second embodiment is provided, but the optical lens 30 according to the second embodiment is also an optical lens of the present invention. For this reason, similarly to the optical module 200 according to the first embodiment, it is possible to supply light with higher uniformity to the subsequent optical element than to the optical module using the conventional optical lens.
  • the optical module 202 according to the second embodiment includes the optical lens 30 that is the optical lens of the present invention, it has the corresponding effect as it is among the effects of the optical module 200 according to the first embodiment.
  • FIG. 8 is a diagram for explaining the optical lens 40 according to the third embodiment.
  • FIG. 9 is a diagram for explaining the optical lens 50 according to the fourth embodiment.
  • FIG. 10 is a diagram for explaining the optical lens 60 according to the fifth embodiment.
  • FIG. 11 is a diagram for explaining the optical lens 70 according to the sixth embodiment.
  • FIG. 12 is a diagram for explaining the optical lens 80 according to the seventh embodiment.
  • the optical lenses 40 to 80 according to the third to seventh embodiments basically have the same configuration as the optical lens 30 according to the second embodiment, but the configuration (parameters) of each surface is the optical lens 30 according to the second embodiment. It is different from the case of.
  • the optical lens 40 includes a leg portion 41, an incident surface 42, an exit surface 43, a bottom surface 44 (first flat portion 45, inclined portion 46, second inclined portion 47), and secondary incident.
  • the optical lens 50 includes a leg 51, an incident surface 52, an exit surface 53, a bottom surface 54 (a first flat portion 55, an inclined portion 56, a second inclined portion 57), and a secondary incident.
  • the optical lens 60 includes a leg portion 61, an incident surface 62, an exit surface 63, a bottom surface 64 (first flat portion 65, inclined portion 66, second inclined portion 67), and secondary incident.
  • the optical lens 70 includes a leg portion 71, an incident surface 72, an exit surface 73, a bottom surface 74 (first flat portion 75, inclined portion 76, second inclined portion 77), and secondary incident.
  • the optical lens 80 includes a leg portion 81, an incident surface 82, an exit surface 83, a bottom surface 84 (first flat portion 85, inclined portion 86, second inclined portion 87), and secondary incident.
  • An optical lens provided with a surface 88.
  • the points different from the optical lens 30 according to the second embodiment will be described in a table.
  • the unit of numerical values in items other than the tilt angle is “mm”, and the unit of numerical values in the tilt angle is “°”.
  • the minimum curvature radius R of each sub-incidence surface is all 0.30 mm, description is abbreviate
  • the optical lenses 40 to 80 according to the third to seventh embodiments do not include the outer peripheral surface referred to in the first and second embodiments, description thereof is also omitted.
  • Optical lens 40 50 60 Diameter 14.96 15.50 15.50 Thickness (including legs) 5.15 5.10 5.10 Thickness (excluding legs) 5.10 5.05 5.05 Leg diameter 1.00 1.00 1.00 First outer diameter D1 4.07 4.07 4.08 Second outer diameter D2 14.96 15.50 15.50 Third outer diameter D3 4.64 4.64 Length of sub-incident surface L1 0.21 0.21 0.20 Length of incident surface L2 3.29 3.29 3.30 Inner diameter of first plane part 4.20 4.21 4.22 Outer diameter of first plane portion 6.00 10.50 10.50 Inner diameter of inclined part 6.00 10.50 10.50 Outer diameter of inclined portion 12.76 13.30 13.30 Inner diameter of second plane portion 12.76 13.30 13.30 Outer diameter of the second planar portion 14.96 15.50 15.50 Height of inclined part 0.50 0.50 0.50 Tilt angle 8.4 20.0 20.0
  • Optical lens 70 80 Diameter 15.50 19.70 Thickness (including legs) 5.10 5.70 Thickness (excluding legs) 5.05 5.62 Leg diameter 1.00 1.67 First outer diameter D1 4.25 2.78 Second outer diameter D2 15.50 19.70 Third outer diameter D3 4.81 3.37 Sub-incident surface length L1 0.19 0.25 Length L2 of incident surface 3.31 3.85 Inner diameter of first plane portion 4.40 2.86 Outer diameter of the first flat portion 10.50 12.55 Inner diameter of inclined part 10.50 12.55 Outer diameter of inclined portion 13.30 18.70 Inner diameter of second plane portion 13.30 18.70 Outer diameter of second flat portion 15.50 19.70 Inclined part height 0.50 0.90 Tilt angle 20.0 14.9
  • the bottom surfaces of the optical lenses 40 to 70 according to the third to sixth embodiments are rough surfaces like the bottom surface 34 of the second embodiment, and are satin-finished.
  • the bottom surface 84 of the optical lens 80 according to Embodiment 7 is a smooth surface.
  • optical lens 30 according to the third to sixth embodiments has the same configuration as that of the optical lens 30 according to the second embodiment except for the configuration (parameters) of each surface, among the effects of the optical lens 30 according to the second embodiment. Has the relevant effect as it is.
  • FIG. 13 is a diagram for explaining the optical lens 90 according to the eighth embodiment.
  • the optical lens 90 according to the eighth embodiment basically has the same configuration as the optical lens 30 according to the second embodiment, but the optical lens 30 according to the second embodiment is different in that the bottom surface has one plane portion. Is different.
  • the optical lens 90 is an optical lens including a leg portion 91, an incident surface 92, an exit surface 93, a bottom surface 94, a sub incident surface 98, and an outer peripheral surface 99.
  • the bottom surface 94 has a flat surface portion 95 and an inclined portion 96.
  • the flat surface portion 95 is a flat surface that is perpendicular to the optical axis (not shown) of the optical lens 90, and is in contact with the outer peripheral end of the sub incident surface 98.
  • the inclined portion 96 is located on the outer peripheral side of the flat portion 95.
  • the outer peripheral surface 99 is a rough surface (satin surface in the optical lens 90), and is subjected to a textured process with an average depth of 9 ⁇ m to 12 ⁇ m and a minimum required draft of 1.5 °.
  • a textured process with an average depth of 9 ⁇ m to 12 ⁇ m and a minimum required draft of 1.5 °.
  • the diameter of the optical lens 90 as a whole is 18.01 mm, and the thickness including the leg portion 91 is 5.81 mm.
  • the diameter of the leg 91 is 2.05 mm.
  • the first outer diameter D1 is 2.78 mm.
  • the second outer diameter D2 is 18.01 mm.
  • the third outer diameter D3 is 3.37 mm.
  • the length L1 of the sub incident surface 98 is 0.25 mm.
  • the length L2 of the incident surface 92 is 3.86 mm.
  • the flat surface portion 95 and the inclined portion 96 have a rough surface (satin surface in the optical lens 90), and the flat surface portion 95 has an average depth of 84 ⁇ m to 89 ⁇ m and a minimum required draft of 9.5 °.
  • No. 96 is satin-finished with an average depth of 8 ⁇ m to 12 ⁇ m and a minimum draft of 2 °.
  • the flat portion 95 has an inner diameter of 2.87 mm and an outer diameter of 9.00 mm when viewed as an annular region centered on the optical axis.
  • the inclined portion 96 has an inner diameter of 9.00 mm and an outer diameter of 17.54 mm when viewed as an annular region centered on the optical axis.
  • the height of the inclined portion 96 is 0.75 mm.
  • the inclination angle of the inclined portion 96 is in the range of 5 ° to 30 ° with respect to the plane perpendicular to the optical axis of the optical lens, and in the eighth embodiment, is about 9.9 °.
  • the optical lens 90 according to the eighth embodiment is different from the optical lens 30 according to the second embodiment in that the bottom surface has one flat portion, but has a sub-incident surface 98 that smoothly connects the incident surface 92 and the bottom surface 94. Therefore, similarly to the optical lens 30 according to the second embodiment, the angle of the boundary portion between the incident surface and the bottom surface of the optical lens is eliminated, and the light incident on the boundary portion between the incident surface and the bottom surface of the optical lens is dispersed. By allocating to the outside, it becomes possible to suppress a large amount of light from entering a specific area (ring-shaped narrow area centered on the optical axis) of the optical elements in the subsequent stage. Then, it becomes possible to supply light with higher uniformity to the optical element at the subsequent stage than the conventional optical lens.
  • the bottom surface 94 has the flat surface portion 95, the flat surface portion 95 is in contact with the outer peripheral end of the sub-incident surface 98, and the inclined portion 96 is positioned on the outer peripheral side of the flat surface portion 95. Since the inclined portion is positioned on the outer peripheral side where it is considered that a relatively large amount of light reflected by the exit surface reaches, when the optical module is formed, the proportion of the inclined portion in the bottom surface is relatively small. However, it is possible to alleviate the concentration of light reflected by the exit surface in a narrow ring-shaped region centered on the optical axis.
  • the optical lens 90 according to the eighth embodiment has the same configuration as that of the optical lens 30 according to the second embodiment except that the bottom surface has one flat portion, and thus the effect of the optical lens 30 according to the second embodiment. Of the relevant effects.
  • FIG. 14 is a diagram for explaining the optical lens 100 according to the ninth embodiment.
  • the optical lens 100 according to the ninth embodiment basically has the same configuration as that of the optical lens 30 according to the second embodiment, except that the bottom surface has only an inclined portion (no flat portion). This is different from the case of the optical lens 30.
  • the optical lens 100 is an optical lens that includes a leg 101, an incident surface 102, an exit surface 103, a bottom surface 104, a sub-incident surface 108, and an outer peripheral surface 109.
  • the bottom surface 104 has an inclined portion 105 that contacts the outer peripheral end of the incident surface 102 and contacts the outer peripheral end of the exit surface 103.
  • an outer peripheral surface 109 exists between the outer peripheral end of the inclined portion 105 and the outer peripheral end of the exit surface 103, but these exist for the convenience of installation of the optical lens, and the inclined portion 105 corresponds to the exit surface 103. It can be said that it is substantially in contact with the outer peripheral edge (via the outer peripheral surface 109).
  • the diameter of the optical lens 100 as a whole is 18.00 mm, and the thickness including the leg portion 81 is 5.75 mm.
  • the diameter of the leg 101 is 1.67 mm.
  • the first outer diameter D1 is 2.79 mm.
  • the second outer diameter D2 is 18.00 mm.
  • the third outer diameter D3 is 3.33 mm.
  • the length L1 of the secondary incident surface 108 is 0.25 mm.
  • the length L2 of the incident surface 102 is 4.15 mm.
  • the inclined portion 105 has a smooth surface. In addition, it is good also as an inclined part which the surface becomes a rough surface.
  • the inclined portion 105 has an inner diameter of 2.86 mm and an outer diameter of 17.54 mm when viewed as an annular region centered on the optical axis. Further, the height of the inclined portion 105 is 0.75 mm.
  • the inclination angle of the inclined portion 105 is in the range of 5 ° to 30 ° with respect to the plane perpendicular to the optical axis of the optical lens, and is about 5.00 ° in the ninth embodiment.
  • the optical lens 100 according to the ninth embodiment is different from the optical lens 30 according to the second embodiment in that the bottom surface has only an inclined portion (no flat portion), but the incident surface 102 and the bottom surface 104 are smoothly connected.
  • the corner of the boundary portion between the incident surface and the bottom surface of the optical lens is eliminated and the boundary portion between the incident surface and the bottom surface of the optical lens is removed.
  • the inclined portion 105 is in contact with the outer peripheral end of the sub-incident surface 108 and in contact with the outer peripheral end of the exit surface 103. Since a large amount of light can be reflected in a direction away from the optical axis, when the optical module is used, the light reflected on the exit surface is reflected on the optical axis by using a relatively wide inclined portion. It is possible to alleviate the concentration in the narrow ring-shaped region at the center.
  • the optical lens 100 according to the ninth embodiment has the same configuration as that of the optical lens 30 according to the second embodiment except that the bottom surface has only an inclined portion. Of which, it has the relevant effect.
  • FIG. 15 is a diagram for explaining the simulation method in the comparative example and Examples 1 to 5.
  • FIG. 16 is a diagram for explaining the illuminance distribution of light by the optical lens 110 according to the comparative example.
  • FIG. 16A is a cross-sectional view of the optical lens 110
  • FIG. 16B is a diagram illustrating an illuminance distribution of light incident on an illumination target.
  • the center of the drawing corresponds to the optical axis of the optical lens 110, and the portion whose color is closer to black is the portion where the light is more strongly incident (the illuminance is higher).
  • FIGS. 17B to 21B described later.
  • FIGS. 17 to 21 are diagrams for explaining the illuminance distribution of light by the optical lenses 120 to 160 according to the first to fifth embodiments.
  • FIGS. 17A to 21A are cross-sectional views of the optical lens 120 to 160
  • FIGS. 17B to 21B are diagrams showing the illuminance distribution of light incident on the illumination target. is there.
  • FIGS. 16B to 21B show a range of a substantially square centered on the optical axis of the light from the light source, and show a reduced range of the incident light.
  • the optical lens 110 according to the comparative example and the optical lenses 120 to 160 according to Examples 1 to 5 are in the latter optical element (the light guide member immediately after the optical lens).
  • the state of incidence of light was observed to confirm the effect of the present invention.
  • a comparative example and an Example were performed as simulation on a computer. A so-called Monte Carlo method was used as a ray tracing method in the simulation.
  • reference numeral 1 denotes an optical lens
  • reference numeral 20a denotes a light source
  • reference numeral 400a denotes a flat light guide member.
  • the illuminance distribution of light incident on the light guide member 400a at the subsequent stage was measured under the same conditions except for the optical lens.
  • the distance between the upper end of the light source 20a and the first flat portion of the optical lens was 0.20 mm.
  • the spatial distance from the upper surface of the circuit board on which the light source 20a was installed to the light guide member 400a was 10 mm.
  • the optical lens 110 according to the comparative example corresponds to a conventional optical lens
  • the optical lenses 120 to 160 according to Examples 1 to 5 correspond to the optical lens of the present invention. That is, the optical lens 110 does not have a sub-incident surface (the corner 118 exists at the boundary between the incident surface and the bottom surface, see FIG. 16A), and the optical lenses 120 to 160 have the sub-incident surface 128. (There are no corners at the boundary between the entrance surface and the bottom surface. See FIGS.
  • the minimum curvature radii of the optical lenses 120 to 160 are 0.10 mm for the optical lens 120, 0.20 mm for the optical lens 130, 0.30 mm for the optical lens 140, 0.40 mm for the optical lens 150, and optical. In the lens 160, it was set to 0.50 mm.
  • the upper limit of the minimum radius of curvature is related to the problem of whether or not the size of the entrance surface can be sufficiently taken, the factors of balance with the size of the optical lens and the entrance surface are relatively large.
  • the lower limit of the minimum radius of curvature is related to the problem of whether the radius of curvature of the sub-incidence surface is too large (the curve is too steep), so there are relatively few factors that balance the size of the optical lens and the incident surface. small. For this reason, in the comparative example and Examples 1 to 5, an experiment relating to the lower limit of the minimum radius of curvature was performed.
  • a light source that emits “light that can be used as white light” is used, but the present invention is not limited to this.
  • a light source that emits light other than “light that can be used as white light” for example, monochromatic light such as red light, green light, and blue light, or light that includes a large amount of a specific color light component may be used.
  • the present invention has been described as an optical lens premised on use in a display device, but the present invention is not limited to this.
  • it may be an optical lens premised on use in a lighting device.
  • FIG. 22 is an enlarged view showing the sub-incident surface 178 in the optical lens 170 (not shown in its entirety) according to the first modification.
  • FIG. 23 is an enlarged view showing the sub-incident surface 188 in the optical lens 180 (not shown) as a modification 2.
  • the optical lenses 170 and 180 have a sub incident surface other than the sub incident surface formed of a curved surface having a single radius of curvature as long as the incident surface and the connecting surface can be smoothly connected except for the shape of the sub incident surface. Can also be used. For example, as shown in FIG.
  • a sub-incident surface formed of a complex curved surface combining free curved surfaces with different curvature radii or a free curved surface (also referred to as a curved surface with a gradually changing curvature radius) can be used.
  • a sub-incident surface made up of a combined surface of a curved surface and a flat surface can be used.
  • the incident surface 12 made of a rotationally symmetric aspherical surface is used.
  • the present invention is not limited to this.
  • An incident surface that is not rotationally symmetric or a spherical incident surface may be used.
  • the incident surface 12 having a shape in which the slope of the tangent line in the curve is 0 only at the point overlapping the optical axis ax is used, but the present invention is not limited to this.
  • An incident surface (for example, an incident surface having a convex portion in the vicinity of the optical axis) having a shape in which the slope of the tangent line in the curve is 0 other than the point overlapping the optical axis may be used.
  • the incident surface 12 in which the tangent line in the curve and the optical axis ax are not parallel is used at any location, but the present invention is not limited to this.
  • An incident surface where the tangent to the curve and the optical axis are parallel may be used at any point.
  • the exit surface 13 having a convex shape is used, but the present invention is not limited to this.
  • An emission surface having a concave shape may be used.
  • the exit surface 13 made of a rotationally symmetric aspheric surface is used.
  • the present invention is not limited to this.
  • An exit surface that is not rotationally symmetric or an exit surface composed of a spherical surface may be used.
  • the exit surface 13 having a shape in which the slope of the tangent line in the curve is 0 only at the point overlapping the optical axis ax is used, but the present invention is not limited to this.
  • An exit surface (for example, an exit surface having a recess near the optical axis) having a shape in which the slope of the tangent line in the curve is 0 other than the point overlapping the optical axis may be used. Furthermore, in the said Embodiment 1, although the exit surface 13 from which the tangent in a curve and the optical axis ax are not parallel in any location was used, this invention is not limited to this. You may use the exit surface where the tangent in a curve and an optical axis become parallel in any location.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Planar Illumination Modules (AREA)
  • Lenses (AREA)

Abstract

Une lentille optique selon la présente invention est une lentille optique (10) qui étend la zone d'éclairage de la lumière émise depuis une source lumineuse (20), du fait qu'elle est utilisée dans une situation où elle est disposée sur le côté d'émission de la source lumineuse (20). La lentille optique (10) comprend : une surface d'incidence (12) qui présente une forme concave entourant la source lumineuse (20) quand la lentille optique (10) est disposée sur le côté d'émission de la source lumineuse (20) et qui présente un premier diamètre (D1) extérieur prescrit; une surface (13) d'émission qui présente un second diamètre (D2) extérieur, supérieur au premier diamètre (D1) extérieur; une surface inférieure (14), située dans une zone entre le bord périphérique extérieur de la surface (12) d'incidence et le bord périphérique extérieur de la surface (13) d'émission; et une surface (18) de sous-incidence qui raccorde en douceur la surface (12) d'incidence et la surface inférieure (14). Quand on utilise la lentille optique selon la présente invention en tant que module optique, ledit module optique peut fournir un élément optique ultérieur avec une lumière ayant une homogénéité supérieure à celle d'une lentille optique conventionnelle.
PCT/JP2013/065665 2013-06-06 2013-06-06 Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage WO2014196048A1 (fr)

Priority Applications (1)

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PCT/JP2013/065665 WO2014196048A1 (fr) 2013-06-06 2013-06-06 Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage

Applications Claiming Priority (1)

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PCT/JP2013/065665 WO2014196048A1 (fr) 2013-06-06 2013-06-06 Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016046067A (ja) * 2014-08-22 2016-04-04 日立アプライアンス株式会社 広角度拡散光学系及びこれを用いた照明装置
JP2017524244A (ja) * 2015-05-27 2017-08-24 アニーキャスティング カンパニー、リミテッド バックライトユニット用ｌｅｄレンズ
JP2018029182A (ja) * 2016-08-18 2018-02-22 ソウル セミコンダクター カンパニー リミテッド 発光モジュ−ル及びレンズ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08337429A (ja) * 1995-06-09 1996-12-24 Hooya Precision Kk ガラスレンズ成形用型及びその製造方法並びにガラスレンズ成形方法
CN101699148A (zh) * 2009-10-21 2010-04-28 苏州中泽光电科技有限公司 一种led路灯用偏心透镜
WO2011016269A1 (fr) * 2009-08-07 2011-02-10 シャープ株式会社 Lentille, module électroluminescent, boîtier d’éléments électroluminescents, dispositif d’éclairage, dispositif d’affichage et récepteur de télévision
JP2011034770A (ja) * 2009-07-31 2011-02-17 Sony Corp 発光装置及び表示装置
JP2011108303A (ja) * 2009-11-16 2011-06-02 Panasonic Corp 光学素子及びそれを用いた光ピックアップ装置
JP2011197544A (ja) * 2010-03-23 2011-10-06 Japan Medical Materials Corp 光グラフト重合用レンズおよび製膜装置
WO2012164790A1 (fr) * 2011-05-31 2012-12-06 パナソニック株式会社 Source de lumière de surface et dispositif d'affichage à cristaux liquides
WO2013088556A1 (fr) * 2011-12-15 2013-06-20 クイックディール・リミテッド Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08337429A (ja) * 1995-06-09 1996-12-24 Hooya Precision Kk ガラスレンズ成形用型及びその製造方法並びにガラスレンズ成形方法
JP2011034770A (ja) * 2009-07-31 2011-02-17 Sony Corp 発光装置及び表示装置
WO2011016269A1 (fr) * 2009-08-07 2011-02-10 シャープ株式会社 Lentille, module électroluminescent, boîtier d’éléments électroluminescents, dispositif d’éclairage, dispositif d’affichage et récepteur de télévision
CN101699148A (zh) * 2009-10-21 2010-04-28 苏州中泽光电科技有限公司 一种led路灯用偏心透镜
JP2011108303A (ja) * 2009-11-16 2011-06-02 Panasonic Corp 光学素子及びそれを用いた光ピックアップ装置
JP2011197544A (ja) * 2010-03-23 2011-10-06 Japan Medical Materials Corp 光グラフト重合用レンズおよび製膜装置
WO2012164790A1 (fr) * 2011-05-31 2012-12-06 パナソニック株式会社 Source de lumière de surface et dispositif d'affichage à cristaux liquides
WO2013088556A1 (fr) * 2011-12-15 2013-06-20 クイックディール・リミテッド Lentille optique, module optique, ensemble de rétroéclairage et dispositif d'affichage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016046067A (ja) * 2014-08-22 2016-04-04 日立アプライアンス株式会社 広角度拡散光学系及びこれを用いた照明装置
JP2017524244A (ja) * 2015-05-27 2017-08-24 アニーキャスティング カンパニー、リミテッド バックライトユニット用ｌｅｄレンズ
JP2018029182A (ja) * 2016-08-18 2018-02-22 ソウル セミコンダクター カンパニー リミテッド 発光モジュ−ル及びレンズ
CN114447198A (zh) * 2016-08-18 2022-05-06 首尔半导体株式会社 一种透镜

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