KR101728429B1 - Light guide body and dimmer - Google Patents

Light guide body and dimmer Download PDF

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Publication number
KR101728429B1
KR101728429B1 KR1020150112252A KR20150112252A KR101728429B1 KR 101728429 B1 KR101728429 B1 KR 101728429B1 KR 1020150112252 A KR1020150112252 A KR 1020150112252A KR 20150112252 A KR20150112252 A KR 20150112252A KR 101728429 B1 KR101728429 B1 KR 101728429B1
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South Korea
Prior art keywords
light
light guide
reflection surface
light source
groove
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KR1020150112252A
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Korean (ko)
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KR20160022770A (en
Inventor
히데유키 이시다
가즈타카 이세
하루오 도미나가
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알프스 덴키 가부시키가이샤
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Publication of KR20160022770A publication Critical patent/KR20160022770A/en
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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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

A light guide and a light control device capable of uniformly dimming are provided. The light guide 10 has one end face in the longitudinal direction of the bar shape as the light incidence face 10a through which the light from the light source 30 is incident and a light exit face 10b disposed on one side along the longitudinal direction, And a groove portion 12 provided on a reflecting surface 10c opposed to the light emitting surface 10b. The groove portion 12 has an arc groove 15 extending in the direction crossing the longitudinal direction. The arcuate groove 15 has a curvature along the reflecting surface 10c in a direction in which the side away from the light source 30 is convex. The light modulation apparatus 1 includes a light guide 10, a light source 30 provided corresponding to the light entrance surface 10a and a rectangular light guide 20 arranged to face the light exit surface 10b.

Description

TECHNICAL FIELD [0001] The present invention relates to a light guide,

The present invention relates to a light guide and a light control device for uniformly dimming light, and more particularly to a light control device for uniformly dimming light using a rod-shaped light guide and a rod-shaped light guide.

A uniform and bright light control device is required for display devices and the like. 11 is a cross-sectional view showing a light source device 100 described in Patent Document 1 as an example of a conventional light modulation device.

Patent Document 1 discloses a configuration in which a rod-shaped light guide 110 and a rectangular light guide plate 120 are combined. The light source apparatus 100 includes a rod-like light guide 110 formed by a transparent material, a point light source 130 mounted on one end of the light guide 110, And a reflector 140 covering the other end surface and the upper surface and both side surfaces of the reflector 140. The lower surface of the light guide 110 which is not covered by the reflector 140 is mounted on the rectangular light guide plate 120 so as to be opposed in parallel to one side thereof. The light guide 110 has a rectangular cross section and is formed on an outer wall surface 110b on the opposite side to the light emitting surface 110a on the side opposite to the rectangular light guide plate 120, And a plurality of grooves 110D extending in a direction intersecting the direction at right angles are formed at predetermined necessary intervals from each other.

The light L130 is reflected by the angle in the direction of the light emitting surface 110a while hitting the side surface of the groove 110D and the light emitting surface 110a and the groove 110D of the light conductor 110 And reaches the reflecting surface of the reflector 140 positioned at the other end side of the light guide 110 while repeating reflection between the outer wall surface 110b on the side where the reflector 140 is formed and the reflecting surface of the reflector 140, And advances in the opposite direction in the light guide 110 to be reflected in the direction of the light emitting surface 110a by colliding with the groove side of the groove 110D.

Japanese Patent Application Laid-Open No. 2001-250413

However, when the light is projected from the rod-like light guide 110 and the light is incident on the rectangular light guide plate 120, the rectangular light guide plate 120 may be positioned near the point light source 130 And the light amount on the side far from the light guide 110 tends to be small and dark. When the light from the point light source 130 is tilted toward the point light source 130 and the light is output by adjusting the angle of the groove so as to reach the outgoing light from the light guiding body 110 substantially evenly at a distant position, ), And it is difficult to sufficiently secure the light quantity of the emitted light. It is difficult to make the side close to the point light source 130 reach farther than the other portions because the amount of light is small. In addition, in the case where the exit light has a good groove angle, light inclined in a direction away from the point light source 130 is emitted, becomes dark at a position far from the point light source 130, and uniform light control becomes difficult there was.

It is an object of the present invention to solve the above-mentioned problems and to provide a light guide and a light control device capable of uniformly dimming.

The light guide according to the present invention is characterized in that one end face in the longitudinal direction of the rod is a light incidence face through which light from the light source is incident and a light exiting face arranged on one side along the longitudinal direction, Wherein the groove portion has arc-shaped grooves extending in a direction intersecting with the longitudinal direction, and the arc-shaped groove is formed in the light-emitting surface along the reflection surface from the light source And a curvature in a direction in which the far side is convex.

According to this configuration, the light from the light source is reflected toward the light output surface by providing the groove portion with the arcuate groove on the reflection surface, and the brightness of the light reaching the predetermined position by condensing in accordance with the shape of the arcuate groove Can be improved. Therefore, the luminance at the far position on the light source side can be increased and the light can be uniformly dimmed.

In the light guide according to the present invention, of the first direction and the second direction orthogonal to the longitudinal direction, the first direction may be a direction parallel to the reflection surface, the second direction may be a direction perpendicular to the reflection surface It is preferable that a distance in the longitudinal direction from the light incidence surface to the groove portion is larger than a length in the first direction of the reflection surface.

According to this configuration, light from the light source is sufficiently reflected by making a specular reflection portion not provided with a groove portion on the reflection surface near the light incidence surface along the longitudinal direction, and then reflected by the groove portion, The reflection efficiency by the groove portion becomes good.

In the light guide according to the present invention, the center of curvature of the arcuate groove formed in the groove portion may be a position shifted from the position of the groove portion toward the light source side by the length of the reflection surface in the first direction, It is preferable to set the time interval between the time t1 and t2.

According to this configuration, the outgoing light from the light exiting surface is appropriately diffused, and an appropriate amount of light can be secured to the far place.

In the light guide according to the present invention, the groove portion includes a plurality of arc-shaped grooves, and the plurality of arc-shaped grooves have a large curvature along the reflection surface on the side closer to the light source .

According to this configuration, by making the arc-shaped groove of the groove portion have a large curvature on the side close to the light source, the focal position of light convergence is relatively close to the light source, and the focal point of light convergence is relatively far away , The emitted light becomes more uniform.

In the light guide according to the present invention, the groove portion may include a plurality of arc-shaped grooves, and the first direction and the second direction orthogonal to the longitudinal direction may be a direction parallel to the reflecting surface And the plurality of arcuate grooves have a diameter larger than the length of the reflecting surface in the first direction when the second direction is a direction perpendicular to the reflecting surface, Shaped grooves arranged at equal intervals in a circumferential direction.

According to this configuration, when the arc-shaped groove of the groove portion is made concentric, the focus position of the light converging is relatively close to the light source and the focus position of the light converging is relatively far away from the light source, .

In the light guide according to the present invention, the arc-shaped groove formed in the groove portion is set such that a center position of the reflection surface in the first direction is a center of curvature.

According to this configuration, since the arcuate grooves are formed in the substantially parallel direction to the light incidence surface, the light to be emitted can be appropriately diffused.

In the light guide according to the present invention, the center of curvature of the arcuate groove is set along the center of the reflecting surface in the first direction.

According to this configuration, the shape of the arc is substantially symmetrical with respect to the light incidence surface, and the light to be emitted is diffused substantially uniformly, and the amount of light reaching the far point can be made substantially uniform.

The light modulation apparatus of the present invention comprises the light guide described in any one of the above items, the light source provided corresponding to the light entrance surface of the light guide, and the rectangular light guide arranged to face the light exit surface of the light guide .

According to this configuration, the entire rectangular light guide can be made to have substantially uniform dimming.

According to the present invention, by providing the groove portion having the arc groove on the reflecting surface facing the light emitting surface, the light from the light source is reflected toward the light output surface and is condensed according to the shape of the arc groove, The luminance of the light reaching the light-emitting layer can be improved. Therefore, it is possible to provide a light guide and a light control device capable of increasing the brightness at a distant position on the light source side and uniformly dimming the light.

Fig. 1 is a perspective view showing a light control apparatus of an embodiment of the present invention. Fig.
2 is a plan view showing a light modulation device according to an embodiment of the present invention.
3 is a front view showing a dimming device according to an embodiment of the present invention.
4 (a) is a front view, and Fig. 4 (b) is a sectional view taken along the line IV-IV in Fig. 4 (a) .
5 is a partial enlarged view of Fig.
6 is an explanatory view showing a path of light from a light source.
7 is a graph showing the measurement result of measuring the luminance of the light modulation apparatus.
Fig. 8 is an example of an arc-shaped groove and is an explanatory view showing the first modification.
Fig. 9 is an example of an arc-shaped groove and is an explanatory view showing a second modification.
10 is an illustration of an arc-shaped groove and a third modified example.
11 is a cross-sectional view showing a conventional light source device.

[First Embodiment]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Further, the drawings are appropriately changed in dimensions for easy understanding.

1 is a perspective view showing a light modulation device 1 according to an embodiment of the present invention. 2 is a plan view showing the light modulation device 1. Fig. 3 is a front view showing the light modulation apparatus 1. Fig. 4 (a) is a front view, and Fig. 4 (b) is a sectional view taken along the line IV-IV in Fig. 4 (a) Fig. Fig. 5 is a partially enlarged view of Fig. 3. Fig. 6 is an explanatory diagram showing the path of light from the light source 30. Fig. 7 is a graph showing the measurement result of the brightness of the light modulation apparatus 1 measured.

As shown in Figs. 1 to 3, the light modulation apparatus 1 of the present embodiment is provided with a rod-like light guide 10, a flat rectangular light guide 20, and a light source 30 . In the following description, the Z1 direction is referred to as upward and the Z1 side to the Z2 side is referred to as a plan view. This is for the sake of easy understanding and does not limit the mounting direction of the light modulation apparatus 1. [

The light source 30 is constituted by a light emitting diode, and is connected to an electric circuit (not shown) to control the light emission.

A transparent synthetic resin material such as an acrylic resin, a polycarbonate resin, or an epoxy resin is used as the rod-shaped light guide 10, And is formed into a columnar shape. With respect to the light source 30, the light guide body 10 is arranged so that the one end surface (X1 side) in the longitudinal direction is the light incidence surface 10a through which the light from the light source 30 enters. The light guide 10 has a light output surface 10b disposed on one side (Y2 side) along the longitudinal direction and a groove portion 12 provided on the reflection surface 10c on the Y1 side facing the light output surface 10b . As shown in Figs. 1 to 5, in the groove 12 of the reflecting surface 10c, a plurality of arcuate grooves 15 extending in the direction crossing the longitudinal direction (X1-X2 direction) are formed. In Figs. 1 to 5, the plane on the Z1 side and the plane on the Z2 side along the longitudinal direction (X1-X2 direction) and the other cross section in the longitudinal direction are formed in a plane capable of regularly reflecting light. Hereinafter, the first direction orthogonal to the longitudinal direction (X1-X2 direction) of the light guide body 10 is set to a direction (Z1-Z2 direction) parallel to the reflection surface 10c and a second direction orthogonal to the longitudinal direction (Y1-Y2 direction) perpendicular to the reflecting surface 10c. In addition, the synthetic resin material is not limited to the one molded by injection molding, but may be formed by cutting synthetic resin or glass.

The rectangular light guide 20 is formed by injection-molding a light-transmitting synthetic resin material. For example, a transparent synthetic resin material such as an acrylic resin, a polycarbonate resin, or an epoxy resin is used. The rectangular light guide 20 has a light incidence surface 20a along the light exiting surface 10b of the light guide 10 and a light exiting surface 20b having a surface shape orthogonal to the light incidence surface 20a. In addition, the synthetic resin material is not limited to the one molded by injection molding, but may be formed by cutting synthetic resin or glass.

As is well known, the rectangular light guide 20 emits light from the light incidence surface 20a by scattering and reflecting the light propagated inside the rectangular light guide 20, (Not shown). Accordingly, the light modulation apparatus 1 of this embodiment can emit light upward (Z1 direction) from the light exit surface 20b of the rectangular light conductor 20, and can perform dimming of the surface shape. Further, the rectangular light conductor 20 is set to have a dimension smaller than the length in the longitudinal direction of the light guide body 10. The light guide 10 is formed so as to extend beyond the length of the dimming range of the rectangular light guide 20 in the longitudinal direction and the light guide 10 is formed so as to protrude from the rectangular light guide 20, And a light source 30 is disposed at a further protruded position.

Next, the features of the light guide 10 and the light modulation apparatus 1 of the present embodiment will be described in detail.

The reflective surface 10c of the light guide member 10 has a flat portion 11 in the vicinity of the light incidence surface 10a as shown in Figure 4 (a) Is positioned at a distance S from the light incidence surface 10a. As shown in Fig. 4 (b), a plurality of arcuate grooves 15 having a V-shaped cross section are formed in the groove 12. The size (groove width and groove depth) of the V-shaped cross section is uniform in all arc-shaped grooves 15. The distance S in the longitudinal direction from the light incidence surface 10a to the groove 12 is larger than the length D1 in the first direction of the reflection surface 10c as shown in Fig. The interval between the light emitting surface 10b and the reflecting surface 10c in the second direction is set to the same dimension as the length D1 in the first direction of the reflecting surface 10c.

The plurality of arc grooves 15 formed in the groove 12 of the reflecting surface 10c of the light guide 10 has a diameter larger than the length D1 of the reflecting surface 10c in the first direction Shaped grooves 16 arranged concentrically at equal intervals along the reflecting surface 10c. As shown in Fig. 5, the plurality of arc-shaped grooves 16 have a curvature in a direction in which the side farther from the light source 30 is convex. For example, the curvature of the arc of radius r is 1 / r, and the arc of small radius has a large curvature.

In the present embodiment, the curvature center 16a of the circular arc groove 16 is set along the center of the reflecting surface 10c in the first direction (Z1-Z2 direction). That is, with respect to the length D1 in the first direction, the center of curvature 16a is located at the center thereof. Therefore, the arc-shaped grooves 16 are vertically symmetrical when viewed from the center position.

In the present embodiment, the arc-shaped grooves 16 are arranged concentrically at equal intervals along the reflecting surface 10c. Therefore, as shown in Fig. 4 (b) Are inclined at equal intervals in the longitudinal direction and in the center position in the first direction.

In the case of the concentric circular arc groove 16, the center of curvature 16a coincides with the circular arc groove 16 of any curvature (FIG. 5). The center of curvature 16a is located between the light incidence surface 10a and the groove 12, that is, in the flat portion 11.

6, the light from the light source 30 is incident on the light incidence surface 10a of the light guide body 10, and the longitudinal direction of the light guide body 10 is defined as Emitting surface 10b while repeating reflections from the side surface and the end surface of the rectangular light guide 20 and incident on the light incidence surface 20a of the rectangular light guide 20. [ At this time, by providing the groove 12 in which the arc groove 15 is formed in the reflection surface 10c, the light from the light source 30 is reflected toward the light output surface 10b, It is possible to improve the brightness of the light reaching the predetermined position. The light from the light source 30 is reflected on the reflecting surface 10c in the vicinity of the light incidence surface 10a along the longitudinal direction by making the specular reflection portion (the flat portion 11) The light is reflected by the groove portion 12 and is output. As a result, the reflection efficiency by the groove portion 12 becomes good.

The plurality of arcuate grooves 15 formed in the groove 12 are concentric circular arc grooves 16 and the curvature center 16a of the arcuate grooves 16 is formed on the surface of the reflective surface 10c And is set along the center of one direction. According to this configuration, the shape of the arc is substantially symmetrical with respect to the light incidence surface 10a, and the diffusion of the outgoing light is performed substantially uniformly, so that the amount of light reaching far can be made substantially uniform. Since the arc-shaped grooves 16 are formed in a direction substantially parallel to the light incidence surface 10a, the light to be emitted can be appropriately diffused. When the arc-shaped grooves 16 are formed concentrically, the focal position of the condensed light is relatively close to the light source 30 at a position close to the light source 30, and the focal position of condensed light is relatively far away.

7 is a graph showing the measurement result of the brightness of the light modulation apparatus 1 of the present embodiment. 7 shows a comparison between an embodiment of the light modulation apparatus 1 and a comparative example provided with a light guide having a conventional linear groove instead of the light guide 10. The luminance is measured at each of the positions (A), (B), and (C) shown in Fig. As shown in Fig. 7, in the case of using a light guide having a conventional straight groove, there has been a problem in that the brightness decreases on the light source 30 side. In the light modulation device 1 of the present embodiment, the luminance of the light source 30 side is higher than that of the comparative example. The light modulation device 1 provided with the light guide body 10 in which the arc groove 16 is formed can increase the luminance at the far position on the light source 30 side (FIGS. 6 and 7A) . In the light modulation device 1 of the present embodiment, since only the curvature is changed without changing the sectional shape of the circular arc groove 16, as compared with the manufacturing process of the conventional structure in which the linear groove is formed, It is possible to change the uniformity of the light modulation without increasing the complexity.

When the center of curvature 16a of the concentric circular arc groove 16 is set to the exit position of the light source 30 and the center of curvature 16a of the concentric circular arc groove 16 is set to be And the luminance was compared for the case of the center. The luminance at the distant positions (Figs. 6 and 7 (A)) on the side of the light source 30 obtained in these cases was the intermediate intensity between the embodiment of Fig. 7 and the comparative example.

It is therefore effective to design the curvature of the arc groove 16 such that the center of curvature 16a is located between the light incidence surface 10a and the groove 12. [ Fig. 8 is an explanatory view showing an example of the arc-shaped groove 16 and showing a first modification of the curvature as described above. In this case, the length D1 in the first direction of the reflecting surface 10c and the radius R1 having the greatest curvature of the circular arc groove 16 are the same size, and the center of curvature 16a is equal to the radius 12 is set between a position shifted toward the light source 30 by the length D1 in the first direction of the reflecting surface 10c and the light incidence plane 10a. In other words, the distance S1 in the longitudinal direction from the light incidence surface 10a to the groove 12 is larger than the length D1 in the first direction of the reflection surface 10c. With this design, the light emitted from the light source 30 is sufficiently irradiated to both ends of the arcuate grooves 16 having the largest curvature, and this portion also effectively contributes to reflection. In the case of Fig. 8, since the length of the flat portion 11 is relatively short, the entire length of the light modulation apparatus 1 can be uniformly dimmed without making the dimension in the longitudinal direction thereof long.

9 shows an example of the circular arc groove 16 and shows a second modification in which the radius R2 of the largest curvature is about 1/2 of the length D1 in the first direction of the reflecting surface 10c Fig. In this case, the radius R2 of the circular arc groove 16 is set to be slightly larger than 1/2 of the length D1 in the first direction. The center of curvature 16a is shifted from the light incidence surface 10a to the groove 12 side so that light emitted from the light source 30 is irradiated to both end portions of the arcuate groove 16 having the largest curvature, (D1) of the first direction 10c. That is, the distance S2 in the longitudinal direction from the light incidence surface 10a to the groove 12 is larger than the length D1 in the first direction of the reflection surface 10c.

Hereinafter, the effects of the present embodiment will be described.

The light guide 10 of the present embodiment has one end face in the longitudinal direction of the rod as the light incidence face 10a through which the light from the light source 30 enters, And has a light surface 10b and a groove portion 12 provided on a reflecting surface 10c opposed to the light output surface 10b. The groove 12 has an arc groove 16 extending in the direction intersecting the longitudinal direction and the arc groove 16 is formed so that the side farther from the light source 30 is convex along the reflecting surface 10c Directional curvature.

According to this configuration, by providing the groove portion 12 in which the circular arc groove 16 is formed in the reflecting surface 10c, the light from the light source 30 is reflected toward the light output surface 10b, It is possible to improve the brightness of the light reaching the predetermined position by condensing the light corresponding to the shape of the light source 16.

Therefore, the luminance at the far position on the light source 30 side can be increased and the light can be uniformly dimmed.

When the first direction is parallel to the reflecting surface 10c in the light guide 10 of the present embodiment, the distance S from the light incoming surface 10a to the groove 12 in the longitudinal direction Is larger than the length D1 in the first direction of the reflecting surface 10c.

According to this configuration, the light from the light source 30 is sufficiently regularly reflected by making the specular reflection portion without the groove portion 12 on the reflection surface 10c near the light incidence surface 10a along the longitudinal direction, The reflection efficiency of the groove portion 12 is improved by reflecting the light by the reflection portion 12 and outputting it.

In the light guide 10 of the present embodiment, the groove 12 has a plurality of circular arc grooves 16, and the plurality of circular arc grooves 16 are formed in the first direction of the reflecting surface 10c And has a diameter larger than the length D1 of the reflecting surface 10c and is arranged at equal intervals in a concentric circle along the reflecting surface 10c.

According to this configuration, by making the circular arc grooves 16 of the groove 12 concentrically formed, the focal position of condensation becomes relatively close to the light source 30, and the focal position of condensation becomes relatively far away Therefore, the light emitted becomes more uniform.

In the light guide 10 of the present embodiment, the curvature center 16a of the arc groove 16 is set along the center of the reflecting surface 10c in the first direction.

According to this configuration, since the arcuate grooves 16 are formed in the substantially parallel direction with respect to the light incidence surface 10a, the light to be emitted can be appropriately diffused. In addition, the shape of the arc is substantially symmetrical with respect to the light incidence surface 10a, and the outgoing light is diffused substantially uniformly, so that the amount of light reaching far can be made substantially uniform.

The light modulation apparatus 1 of the present embodiment includes a light guide 10, a light source 30 provided corresponding to the light entrance surface 10a of the light guide 10, And a rectangular light guide 20 arranged opposite to the light guide plate 20.

According to this configuration, the entire rectangular light conductor 20 can be made to have substantially uniform dimming.

As described above, the light guide 10 and the light modulation device 1 of the embodiment of the present invention have been specifically described. However, the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the present invention . For example, the following modifications can be made, and these are also within the technical scope of the present invention.

(1) In the present embodiment, the grooves formed in the grooves 12 are not limited to the concentric circular arc grooves 16, but may be curved arc grooves 15 whose curvature decreases with distance from the light source 30, . For example, Fig. 10 shows an example of the arc groove 15 and is an explanatory view showing the third modification. The arcuate groove 15 shown in Fig. 10 has a curvature of an ellipse having a larger diameter as the distance from the light source 30 increases. In addition to the ellipse, for example, it may have a curvature of hyperbola, or other arc-shaped groove whose center of curvature does not coincide. Further, by approximating the arcuate groove 15 to a circular arc, the position of the center of curvature and the size of the curvature can be designed similarly to the circular arc groove 16. The side close to the light source 30 is formed as a circular arc groove 15 such as a concentric circular arc groove 16 and the side farther from the light source 30 is formed as a linear groove, It may be.

(2) In the present embodiment, the arrangement of the light sources 30 is arranged at the center in the vertical direction of the light guide body 10, but strictly, they do not coincide with manufacturing variations or the like. Even if the light source 30 slightly deviates in the vertical direction or the curvature center 16a of the arc groove 16 deviates from the center of the light guide 10, If the position is set to be centered at the curvature, uniform dimming can be achieved in the same manner as in the present embodiment.

(3) In the present embodiment, the arc groove 16 has a V-shaped inclined surface, but it may have a rounded shape. It may be a U-shaped inclined surface instead of a V-shaped surface.

(4) In the present embodiment, the light guide 10 has a substantially quadrangular prism shape, and each side surface other than the reflection surface 10c is flat. However, even if grooves are formed on the side surfaces other than the reflection surface 10c do. It is also possible to adopt a substantially quadrangular prism shape in which a part of the side surface is curved.

(5) In the present embodiment, the arc-shaped groove 16 has the same size (groove width and groove depth) of the V-shaped cross section, and the manufacturing process is not complicated, but the present invention is not limited to this. For example, the size, pitch, shape, and the number of grooves per unit length of the V-shaped cross section may be gradually changed along the length direction.

1: dimming device 10: light guide
10a: incoming surface 10b: outgoing surface
10c: reflecting surface 11:
12: groove portion 15: arc-shaped groove
16: arc shape groove 16a: center of curvature
20: rectangular light guide 20a:
20b: outgoing surface 30: light source
D1: Length in the first direction R1, R2: Radius
S, S1, S2: Distance in the longitudinal direction

Claims (17)

One end surface in the longitudinal direction of the bar shape is a light incidence surface through which light from the light source is incident and has a light exit surface disposed on one side along the longitudinal direction and a groove portion provided on a reflection surface opposite to the light exit surface In the light guide,
Wherein the groove portion has an arc groove extending in a direction crossing the longitudinal direction,
Wherein the arcuate groove has a curvature along a direction of convexity on a side farther from the light source along the reflection surface,
When the first direction is a direction parallel to the reflection surface and the second direction is a direction perpendicular to the reflection surface in a first direction and a second direction orthogonal to the longitudinal direction,
Wherein a distance in the longitudinal direction from the light incidence surface to the groove portion is larger than a length in the first direction of the reflection surface. One end surface in the longitudinal direction of the bar shape is a light incidence surface through which light from the light source is incident and has a light exit surface disposed on one side along the longitudinal direction and a groove portion provided on a reflection surface opposite to the light exit surface In the light guide,
Wherein the groove portion has an arc groove extending in a direction crossing the longitudinal direction,
Wherein the arc-shaped groove has a curvature along a direction in which the side away from the light source is convex along the reflection surface,
When the first direction is a direction parallel to the reflection surface and the second direction is a direction perpendicular to the reflection surface in a first direction and a second direction orthogonal to the longitudinal direction,
Wherein a center of curvature of the arcuate groove formed in the groove portion is set between a position shifted from the position of the groove portion toward the light source side by the length of the reflection surface in the first direction and between the light incidence surface Light guide. The method according to claim 1,
When the first direction is a direction parallel to the reflection surface and the second direction is a direction perpendicular to the reflection surface in a first direction and a second direction orthogonal to the longitudinal direction,
Wherein a center of curvature of the arcuate groove formed in the groove portion is set between a position shifted from the position of the groove portion toward the light source side by the length of the reflection surface in the first direction and between the light incidence surface Light guide. The method according to claim 1,
Wherein the groove portion has a plurality of arc-shaped grooves,
Wherein the plurality of arc-shaped grooves have a large curvature along a side close to the light source along the reflection surface. 3. The method of claim 2,
Wherein the groove portion has a plurality of arc-shaped grooves,
Wherein the plurality of arc-shaped grooves have a large curvature along a side close to the light source along the reflection surface. The method of claim 3,
Wherein the groove portion has a plurality of arc-shaped grooves,
Wherein the plurality of arc-shaped grooves have a large curvature along a side close to the light source along the reflection surface. 7. The method according to any one of claims 1 to 6,
Wherein the groove portion has a plurality of arc-shaped grooves,
When the first direction is a direction parallel to the reflection surface and the second direction is a direction perpendicular to the reflection surface in a first direction and a second direction orthogonal to the longitudinal direction,
Wherein the plurality of arcuate grooves are a plurality of arcuate grooves having a diameter larger than the length of the reflection surface in the first direction and arranged at equal intervals in a concentric circle along the reflection surface . 8. The method of claim 7,
Wherein the arcuate groove formed in the groove portion is set such that a center position of the reflection surface in the first direction is a curvature center. 9. The method of claim 8,
Wherein the curvature center of the arcuate groove is set along a center of the reflection surface in the first direction. One end surface in the longitudinal direction of the bar shape is a light incidence surface through which light from the light source is incident and has a light exit surface disposed on one side along the longitudinal direction and a groove portion provided on a reflection surface opposite to the light exit surface In the light guide,
Wherein the groove portion has an arc groove extending in a direction crossing the longitudinal direction,
Wherein the arcuate groove has a curvature along a direction of convexity on a side farther from the light source along the reflection surface,
Wherein the groove portion has a plurality of arc-shaped grooves,
When the first direction is a direction parallel to the reflection surface and the second direction is a direction perpendicular to the reflection surface in a first direction and a second direction orthogonal to the longitudinal direction,
Wherein the plurality of arcuate grooves are a plurality of arcuate grooves having a diameter larger than the length of the reflection surface in the first direction and arranged at equal intervals in a concentric circle along the reflection surface . 11. The method of claim 10,
Wherein the arcuate groove formed in the groove portion is set such that a center position of the reflection surface in the first direction is a curvature center. 12. The method of claim 11,
Wherein the curvature center of the arcuate groove is set along a center of the reflection surface in the first direction. A lighting device comprising: the light guide according to any one of claims 1 to 6; the light source provided corresponding to the light entrance surface of the light guide; and a rectangular light guide arranged to face the light exit surface of the light guide And a second light source. A light modulation device comprising the light guide according to claim 7, the light source provided corresponding to the light entrance surface of the light guide, and a rectangular light guide disposed to face the light exit surface of the light guide. 9. A light modulation device comprising: the light guide according to claim 8; the light source provided corresponding to the light entrance surface of the light guide; and a rectangular light guide arranged to face the light exit surface of the light guide. A light modulation device comprising the light guide according to claim 9, the light source provided corresponding to the light entrance surface of the light guide, and a rectangular light guide disposed to face the light exit surface of the light guide. 13. A lighting device comprising: the light guide according to any one of claims 10 to 12; the light source provided corresponding to the light entrance surface of the light guide; and a rectangular light guide arranged to face the light exit surface of the light guide And a second light source.
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JP2003098357A (en) * 2001-09-20 2003-04-03 Nippon Leiz Co Ltd Light transmission body, light source device and planar illuminator

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