JP2022170655A - Light-emitting device - Google Patents

Abstract

To provide a light-emitting device that can change the direction of light emission and allows light from a light emitter to be efficiently extracted to outside.SOLUTION: A light-emitting device 100 includes: a light emitter 1 having a light emission face 1a; a light guide 11 that includes a total reflector 23 to reflect incoming light from the light emitter 1 and a Fresnel lens that receives the light reflected by the total reflector 23, the light guide designed to guide the incoming light; and a movement mechanism 70 that moves the light guide 11 relative to the light emitter 1 along a direction crossing the central axis 1c of the light emission face 1a.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to light emitting devices.

2. Description of the Related Art Conventionally, light-emitting devices including light-emitting diodes and the like have been widely used. For example, Patent Literature 1 discloses a light source, a lens that transmits light emitted from the light source in a first direction, and a lens that is movably supported in a second direction that intersects the first direction with respect to the light source. A support mechanism is disclosed.

JP 2020-53194 A

A light-emitting device is required to efficiently extract light from a light-emitting portion to the outside.

An object of the embodiments of the present disclosure is to provide a light-emitting device capable of changing the irradiation direction of light and efficiently extracting light from a light-emitting portion to the outside.

A light-emitting device according to an embodiment of the present disclosure includes a light-emitting portion having a light-emitting surface, a total reflection portion that reflects incident light from the light-emitting portion, and a Fresnel lens portion that receives the light reflected by the total reflection portion. and a light guide member that guides the incident light, and a moving mechanism that relatively moves the light guide member with respect to the light emitting portion along a direction intersecting the central axis of the light emitting surface. have.

According to the light-emitting device according to the embodiment of the present disclosure, it is possible to provide a light-emitting device that can change the irradiation direction of light and efficiently extract light from the light-emitting portion to the outside.

It is a figure explaining the partial irradiation of the light by the light-emitting device which concerns on embodiment. It is a figure which shows the 1st example of the utilization scene of the light-emitting device which concerns on embodiment. It is a figure which shows the 2nd example of the utilization scene of the light-emitting device which concerns on embodiment. It is a figure which shows the 3rd example of the utilization scene of the light-emitting device which concerns on embodiment. 1 is a cross-sectional view showing the configuration of a light emitting device according to an embodiment; FIG. 2 is a plan view of the light-emitting device according to the embodiment viewed from the light guide member side with the housing and the transparent member omitted; FIG. 1 is a cross-sectional view showing a configuration example of a light-emitting device including a plurality of light-emitting portions; FIG. FIG. 6C is a plan view of the light emitting device of FIG. 6B, with the housing and the transparent member omitted, as viewed from the light guide member side; It is the top view which looked at the light guide member of the light-emitting device which concerns on embodiment from the light-emitting part side. 1 is a cross-sectional view showing an example of the configuration of a light emitting section of a light emitting device according to an embodiment; FIG. 4 is a cross-sectional view showing another example of the configuration of the light emitting section of the light emitting device according to the embodiment; FIG. FIG. 4 is a plan view of an example of a light-emitting portion having a plurality of light-emitting surfaces viewed from the light guide member side; FIG. 4 is a cross-sectional view showing the optical path of the light emitting device when the light guide member is not moved; 11 is a schematic diagram showing the illuminance distribution of the light emitting device of FIG. 10; FIG. FIG. 10 is a plan view showing the positional relationship between the light guide member moved to one side and the light emitting section in the light emitting device according to the embodiment, with the housing and the transparent member omitted, viewed from the light guide member side. 13 is a cross-sectional view showing an optical path of the light emitting device of FIG. 12; FIG. 14 is a schematic diagram showing the illuminance distribution of the light emitting device of FIG. 13; FIG. FIG. 10 is a plan view showing the positional relationship between the light guide member moved to the other side and the light emitting section in the light emitting device according to the embodiment, with the housing and the transparent member omitted, viewed from the light guide member side. 16 is a cross-sectional view showing an optical path of the light emitting device of FIG. 15; FIG. FIG. 17 is a schematic diagram showing the illuminance distribution of the light emitting device of FIG. 16; FIG. 10 is a cross-sectional view showing optical paths of a light-emitting device according to another example of the embodiment; FIG. 19 is a schematic diagram showing the illuminance distribution of the light emitting device of FIG. 18; 4 is a cross-sectional view showing optical paths of the light emitting device according to the embodiment; FIG. 21 is a schematic diagram showing the illuminance distribution of the light emitting device of FIG. 20; FIG. 1 is a cross-sectional view showing a first example of an optical path of a light emitting device according to an embodiment; FIG. FIG. 23 is a schematic diagram of an illuminance distribution of light passing through the A region of the light emitting device of FIG. 22; FIG. 23 is a schematic diagram of an illuminance distribution of light passing through the B region of the light emitting device of FIG. 22; FIG. 23 is a schematic diagram of an illuminance distribution of light passing through region C of the light emitting device of FIG. 22; FIG. 26 is a schematic diagram of an illuminance distribution obtained by synthesizing the illuminance distributions of FIGS. 23 to 25; FIG. 5 is a cross-sectional view showing a second example of optical paths of the light emitting device according to the embodiment; FIG. 28 is a schematic diagram of the illuminance distribution of light passing through the A region of the light emitting device of FIG. 27; FIG. 28 is a schematic diagram of the illuminance distribution of light passing through the B region of the light emitting device of FIG. 27; FIG. 28 is a schematic diagram of an illuminance distribution of light passing through region C of the light emitting device of FIG. 27; 31 is a schematic diagram of an illuminance distribution obtained by synthesizing the illuminance distributions of FIGS. 28 to 30; FIG. FIG. 10 is a cross-sectional view showing a third example of the optical path of the light emitting device according to the embodiment; FIG. 33 is a schematic diagram of an illuminance distribution of light passing through the A region of the light emitting device of FIG. 32; FIG. 33 is a schematic diagram of an illuminance distribution of light passing through the B region of the light emitting device of FIG. 32; FIG. 33 is a schematic diagram of an illuminance distribution of light passing through the C region of the light emitting device of FIG. 32; FIG. 36 is a schematic diagram of an illuminance distribution obtained by synthesizing the illuminance distributions of FIGS. 33 to 35; FIG. 4 is a cross-sectional view showing a first example of the positional relationship between the light guide member and the light emitting section in the height direction; FIG. 7 is a cross-sectional view showing a second example of the positional relationship between the light guide member and the light emitting section in the height direction; FIG. 11 is a cross-sectional view showing a third example of the positional relationship between the light guide member and the light emitting section in the height direction; FIG. 11 is a cross-sectional view showing a fourth example of the positional relationship between the light guide member and the light emitting section in the height direction; It is a figure which shows the relationship between the light guide member movement amount and illuminance distribution which concern on 1st Example. It is a figure which shows the relationship of the light guide member movement amount and illuminance distribution which concern on 2nd Example. It is a figure which shows the relationship between the light guide member moving amount|distance and illuminance distribution which concerns on a comparative example. FIG. 3 is a cross-sectional view illustrating an example of dimensions of the light emitting device according to the embodiment; FIG. 44B is a partially enlarged view of region Q of FIG. 44A; FIG. 4 is a perspective view of the light guide member viewed from the −Z side; It is a sectional view showing composition of a light-emitting device concerning the 1st modification. FIG. 45 is a cross-sectional view showing a state in which the light emitting unit is moved in the light emitting device of FIG. 44; It is a cross-sectional view showing the configuration of a light emitting device according to a second modification. FIG. 11 is a cross-sectional view showing the configuration of a light emitting device according to a third modified example;

A light emitting device according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the embodiments shown below are examples of light-emitting devices for embodying the technical idea of the present embodiment, and are not limited to the following. In addition, unless there is a specific description, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention, but are merely illustrative examples. It's nothing more than Note that the sizes, positional relationships, etc. of members shown in each drawing may be exaggerated for clarity of explanation. Further, in the following description, the same names and symbols indicate the same or homogeneous members, and detailed description thereof will be omitted as appropriate. An end view showing only a cut surface may be used as a cross-sectional view.

In the diagrams shown below, directions may be indicated by the X-axis, Y-axis, and Z-axis. The Y direction along the Y axis indicates the direction perpendicular to the X direction in the plane, and the Z direction along the Z axis indicates the direction perpendicular to the plane.

In addition, the direction in which the arrow points in the X direction is indicated as +X direction or +X side, the direction opposite to +X direction is indicated as -X direction or -X side, and the direction in which the arrow points in Y direction is indicated as +Y direction or +Y side, The direction opposite to the +Y direction is referred to as the -Y direction or the -Y side. In addition, the direction in which the arrow points in the Z direction is expressed as +Z direction or +Z side, and the direction opposite to +Z direction is expressed as -Z direction or -Z side. In the embodiments, as an example, the light-emitting unit included in the light-emitting device emits light toward the +Z side. Further, the planar view in terms of the embodiments means viewing the object from the Z direction. However, these do not limit the orientation of the light-emitting device in use, and the orientation of the light-emitting device is arbitrary.

A light-emitting device according to an embodiment includes a light-emitting portion having a light-emitting surface, a total reflection portion for reflecting incident light from the light-emitting portion, and a Fresnel lens portion for receiving light reflected by the total reflection portion. It has a light guide member that guides light, and a movement mechanism that relatively moves the light guide member with respect to the light emitting portion along a direction that intersects the central axis of the light emitting surface. The light-emitting device can partially irradiate a desired region of the irradiable region to which it can irradiate light, and can change the partial irradiation region by relative movement of the movement mechanism. Here, the Fresnel lens portion refers to a portion in which a convex or concave lens shape is divided into concentric regions and has a sawtooth-shaped cross section.

FIG. 1 is a diagram illustrating partial irradiation of light by a light emitting device 100 according to an embodiment. In FIG. 1, the light-emitting device 100 irradiates the partial irradiation region 210 of the irradiable region 200 with light, and does not irradiate the region other than the partial irradiation region 210 with light.

When the light emitting device 100 is in a stationary state where the light emitting device 100 itself does not move, the light emitting device 100 moves, for example, the partial irradiation region in the direction of the arrow 220 by the relative movement of the moving mechanism, from the partial irradiation region 210 to the partial irradiation region 210a. can be changed.

The irradiable region 200 means a region where the light emitting device 100 can irradiate light when the light emitting device 100 is stationary, that is, a region where the partial irradiation region 210 can be changed by relative movement of the moving mechanism. Partial irradiation refers to partially irradiating a part of the irradiation-enabled region 200 with light.

In FIG. 1, the irradiable region 200 is exemplified as a substantially rectangular region, and the partial irradiation region 210 is exemplified as a substantially circular region, but they are not limited to this. A substantially circular or substantially elliptical region can be set as the irradiable region 200 , and a substantially rectangular or substantially elliptical region can be set as the partial irradiation region 210 .

2 to 4 are diagrams illustrating usage scenes of the light emitting device 100. FIG. 2 shows a first example, FIG. 3 shows a second example, and FIG. 4 shows a third example. FIGS. 2 to 4 show usage scenes in which the light emitting device 100 is mounted in a photographing device such as a camera or a video camera, and the light emitted from the light emitting device 100 is used as illumination light for photographing.

2 to 4 show how a person is photographed in a dark environment such as at night. In FIG. 2, a person is photographed against a background of a shopping street, FIG. 3, an illumination, and FIG. 4, a night scene. . By partially illuminating only the peripheral area of the person without irradiating the background area with light, it is possible to photograph the desired area such as the face of the person under bright photographing conditions while sharply photographing the background.

For example, when the light-emitting device 100 is mounted on a smartphone and a camera mounted on the smartphone is used to capture images in the usage scenes shown in FIGS. Relative movement by a movement mechanism is enabled in conjunction with a touch operation performed by a user.

The user visually recognizes the position of the person in the still image or moving image displayed on the touch panel, and performs a touch operation so as to partially illuminate the person according to the position of the person. For example, the light-emitting device 100 moves the partial irradiation light according to the trajectory traced by the user's finger on the touch panel, and changes the partial irradiation area 210 .

The partial irradiation light continues irradiation continuously without interrupting irradiation even while moving. As a result, the user can shoot a still image or a moving image while viewing it in real time. Therefore, it is possible to shoot a desired area such as a person's face under bright shooting conditions while making it possible to shoot a clear background with a simple operation. You can shoot with certainty.

However, the application of the light-emitting device 100 is not limited to the above-described camera imaging, and may be any application as long as it is used for irradiating light. In addition, devices or devices on which the light emitting device 100 is mounted are not limited to cameras and smartphones, and the light emitting device 100 can be mounted on various lighting equipment, automobiles, and the like.

The configuration, functions, and the like of the light emitting device 100 will be described in more detail below.

(Overall configuration example)
FIG. 5 is a cross-sectional view showing an example of the configuration of the light emitting device 100 according to the embodiment. FIG. 6A is a plan view of the light emitting device 100 with the housing 51 and the transparent member 54 omitted, viewed from the light guide member 11 side. FIG. 7 is a plan view of the light guide member 11 viewed from the light emitting section 1 side. 5 is a cross-sectional view of the light-emitting device 100 shown in FIG. 6A taken along line DD.

As shown in FIGS. 5 to 7, the light emitting device 100 has a light emitting section 1, a light guide member 11, and a moving mechanism .

The light emitting unit 1 is formed in a substantially rectangular shape in plan view, and is mounted on the +Z side surface of the light emitting unit mounting board 41 . At least one light-emitting unit 1 is sufficient, but for example, a plurality of light-emitting units 1 may be provided. FIG. 6B is a cross-sectional view showing an example of a configuration of a light-emitting device 100 including multiple light-emitting units 1. As shown in FIG. 6C is a plan view of the light emitting device 100 of FIG. 6B viewed from the light guide member 11 side with the housing 51 and the transparent member 54 omitted. 6B is a cross-sectional view of the light-emitting device 100 shown in FIG. 6C taken along the line EE.

As shown in FIGS. 6B and 6C, the plurality of light emitting units 1 are vertically or horizontally arranged in a plan view, or arranged in a grid pattern to form nine light emitting units 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, and 1I. Each light emitting unit 1 is arranged. The light-emitting portion 1A includes a light-emitting surface 1Aa, the light-emitting portion 1B includes a light-emitting surface 1Ba, the light-emitting portion 1C includes a light-emitting surface 1Ca, the light-emitting portion 1D includes a light-emitting surface 1Da, and the light-emitting portion 1E includes a light-emitting surface 1Ea. . The light emitting portion 1F includes a light emitting surface 1Fa, the light emitting portion 1G includes a light emitting surface 1Ga, the light emitting portion 1H includes a light emitting surface 1Ha, and the light emitting portion 1I includes a light emitting surface 1Ia. Each light emitting surface 1Aa, 1Ba, 1Ca, 1Da, 1Ea, 1Fa, 1Ga, 1Ha and 1Ia of all the light emitting portions 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H and 1I is a total reflection portion in plan view. 23 (more specifically, inside the lowermost portion 16 of the frame-shaped light guide member 11 in a plan view). From the viewpoint of the light emission characteristics of the light emitting device 100, the narrower the distance between the light emitting portions, the better.

As will be described later, one light-emitting portion 1 may have a plurality of light-emitting surfaces 1a in plan view. By providing a plurality of light-emitting portions 1 or a plurality of light-emitting surfaces 1a, the light amount of the light-emitting device 100 can be increased. Further, when the light-emitting device 100 includes a plurality of light-emitting portions 1 or a plurality of light-emitting surfaces 1a, the plurality of light-emitting portions 1 or the plurality of light-emitting surfaces 1a (more specifically, the light-emitting elements 2 corresponding to the plurality of light-emitting surfaces 1a) are The lighting may be controlled independently of each other.

6B and 6C illustrate nine light-emitting units 1 arranged vertically and horizontally or in a grid pattern, but the arrangement and number of light-emitting units 1 are not limited to this, and can be changed as appropriate. is.

The light-emitting unit mounting board 41 is a plate-like member having a substantially rectangular shape in plan view, and is a board provided with wiring on which a light-emitting element and various electric elements can be mounted. A housing 51 is provided on the light emitting unit mounting substrate 41 , and a transparent member 54 is arranged in an opening 52 of the housing 51 . The transparent member 54 overlaps the light emitting section 1 and the light guide member 11 in plan view.

The light-emitting portion 1 has a light-emitting surface 1 a and emits light toward a light guide member 11 provided on the +Z side of the light-emitting portion 1 . The light-emitting surface 1 a refers to the main light extraction surface of the light-emitting section 1 . An LED (Light Emitting Diode) or the like can be used for the light emitting portion 1 . The light emitted by the light emitting unit 1 is preferably white light, but may be monochromatic light. By selecting the light emitting unit 1 according to the intended use of the light emitting device 100, the light emitted by the light emitting unit 1 can be appropriately selected.

The light guide member 11 guides and emits the incident light from the light emitting section 1 . The light guide member 11 is a member in which a first incidence portion 12, a second incidence portion 13, a third incidence portion 14, a total reflection portion 23, and a Fresnel lens portion 31 are formed. The light guide member 11 is transparent to the light emitted by the light emitting section 1 and contains at least one of a resin material such as a polycarbonate resin, an acrylic resin, a silicone resin, an epoxy resin, or a glass material. Here, the term "optical transparency" refers to the property of allowing 60% or more of the light from the light emitting section 1 to pass therethrough.

The light guide member 11 is formed in a substantially circular shape as a whole in plan view. Each of the first incident portion 12, the second incident portion 13, the third incident portion 14, and the total reflection portion 23 is formed on the side on which the light from the light emitting portion 1 is incident. The first incidence portion 12 has a substantially rectangular shape in plan view, and each of the second incidence portion 13, the third incidence portion 14, and the total reflection portion 23 has a substantially rectangular frame shape in plan view. The substantially rectangular frame shape in plan view is an example of the frame shape in plan view. Here, the term “frame-like” refers to a state in which the surroundings are surrounded. Further, the planar view shape of the first incident portion 12 may be substantially circular, and the planar view shapes of the second incident portion 13, the third incident portion 14, and the total reflection portion 23 may each be ring-shaped. good too. In addition, a ring shape means a state like a ring.

The Fresnel lens portion 31 is formed on the side opposite to the side on which the light guided by the light guide member 11 is emitted, that is, the side on which the light from the light emitting portion 1 is incident, and has a substantially circular shape in plan view. .

However, the planar shape of the light guide member 11 as a whole is not limited to a substantially circular shape, and may be substantially rectangular, substantially triangular, substantially elliptical, substantially polygonal, or the like. When the light-emitting device 100 is used as a flash light source for a camera, the shape of the light guide member 11 in a plan view is four-fold rotational symmetry or A two-fold rotationally symmetrical shape is preferred.

The light incident on the inside of the light guide member 11 through the first incident portion 12 or the second incident portion 13 is condensed by being guided inside the light guide member 11 toward the Fresnel lens portion 31. . The light incident on the inside of the light guide member 11 through the third incident portion 14 is guided inside the light guide member 11 , reaches the total reflection portion 23 , and is reflected by the total reflection portion 23 . The light reflected by the total reflection portion 23 is condensed by being guided inside the light guide member 11 toward the Fresnel lens portion 31 . The first incident portion 12, the second incident portion 13, the third incident portion 14, and the total reflection portion 23 function, for example, as a TIR (Total Internal Reflection) lens that collects the light emitted from the light emitting portion 1. A TIR lens is an example of the light guide member 11 including a total reflection portion 23 that totally reflects light. Although the light guide member 11 does not have to include the second incident portion 13, the provision of the second incident portion 13 allows the light from the light emitting portion 1 to be extracted more efficiently.

The first incident portion 12 is formed in a convex shape toward the light emitting portion 1 side, and a convex corner portion 15 arranged in a substantially rectangular frame shape is formed around the first incident portion 12 . preferable.

The corner portions 15 are preferably arranged continuously or intermittently in a substantially rectangular frame shape around the first incident portion 12 . In this embodiment, the corner portion 15 is formed in a substantially rectangular frame shape with one round, but may be formed with a plurality of rounds. By providing the corner portion 15, the radius of the first incident portion 12 can be reduced, so that more incident light from the light emitting portion 1 can be taken in, and the light condensing property is improved. In this embodiment, the third incident portion 14 having curvature in the radial direction is exemplified.

Each of the first incident portion 12, the second incident portion 13, and the third incident portion 14 is formed inside a total reflection portion 23 provided in a substantially rectangular frame shape, and the incident light from the light emitting portion 1 is It has a curved surface that condenses the light. It is preferable that the radii of curvature of the curved surfaces of the first incident portion 12, the second incident portion 13, and the third incident portion 14 are different. That is, the light guide member 11 preferably has a plurality of curved surfaces with different radii of curvature.

In this embodiment, the total reflection portion 23 having curvature in the radial direction is exemplified. It should be noted that the shape formed by the total reflection portion 23 and the third incidence portion 14 is aligned with the central axis 11c of the light guide member 11 regardless of the presence or absence of curvature in the radial direction. It may be tapered so that the orthogonal cross-sectional area is smaller on the side of the light emitting unit 1 than on the side of the Fresnel lens unit 31 . The radius of curvature of the total reflection portion 23 in the radial direction or the inclination angle of the inclined surface of the total reflection portion 23 with respect to the central axis 11c of the light guide member 11 can be appropriately set within a range in which the incident light from the light emitting portion 1 can be reflected. If the shapes of the first incidence portion 12, the second incidence portion 13, the third incidence portion 14, and the total reflection portion 23 are determined so that as much of the light incident on the total reflection portion 23 as possible satisfies the conditions for total reflection, light emission The extraction efficiency of light emitted from the portion 1 is further improved.

Since the total reflection portion 23 is provided outside the third incident portion 14, the light emitted from the light emitting portion 1 is reflected at a wide angle (hereinafter simply referred to as wide angle) with respect to the central axis 1c of the light emitting surface 1a. Emitted light can be collected by the light guide member 11, and the extraction efficiency of the light emitted from the light emitting section 1 is improved.

In this embodiment, the area of the region inside the outer edge 231 of the total reflection portion 23 is larger than the light emitting surface 1 a of the light emitting portion 1 . This configuration suppresses incident light to the light guide member 11 from reaching the total reflection portion 23 when the light emitting portion 1 faces the first incident portion 12 provided in the center of the light guide member 11. Therefore, spread of light is suppressed.

The Fresnel lens portion 31 transmits the emitted light from the light guide member 11 of the light guided inside the light guide member 11 . The Fresnel lens portion 31 is formed by dividing the curved surface of the lens into substantially concentric circular regions and folding within a desired thickness. The Fresnel lens portion 31 has a saw-toothed cross-sectional shape, and has a substantially concentric circular shape that is symmetrical about the central axis of the Fresnel lens portion 31 in plan view. In this embodiment, the Fresnel lens portion 31 is formed on the bottom surface of the concave portion 32 formed on the +Z side surface of the light guide member 11 .

The Fresnel lens portion 31 refracts or diffracts light passing through the Fresnel lens portion 31 according to its shape, thereby producing desired optical characteristics such as light distribution characteristics. The optical characteristics of the Fresnel lens portion 31 can be appropriately set by determining the width or height of the substantially concentric circles.

The moving mechanism 70 is installed on the +Z side surface of the light emitting unit mounting substrate 41 and is an electromagnetic actuator that supports the light guide member 11 so as to be movable within the XY plane. The XY plane is a plane substantially parallel to the +Z side surface of the light emitting unit mounting board 41 . The moving mechanism 70 has a frame portion 71 , an N pole magnet 72 , an S pole magnet 73 , a base portion 74 , a spring 75 and a coil 76 .

The frame portion 71 is a substantially rectangular frame-shaped member when viewed from above. The frame portion 71 supports the light guide member 11 by arranging the light guide member 11 inside and bonding the outer edge portion 25 of the light guide member 11 and the inner surface of the frame portion 71 with the adhesive member 61 . .

The frame portion 71 is configured including a resin material, a metal material, or the like. It is preferable that the frame portion 71 includes a color material such as black on its surface or inside that can absorb the light emitted by the light emitting portion 1 . With this configuration, the frame portion 71 can absorb the light that has leaked to the frame portion 71 side through the outer edge portion 25 and the total reflection portion 23 of the light guide member 11 , so that the light reflected by the frame portion 71 is transmitted to the light guide member 11 side. can be inhibited from returning to As a result, ghost light, flare light, or the like accompanying return light can be reduced, and the contrast of the light emitted from the light emitting device 100 can be increased.

The contrast of the irradiated light refers to the difference in brightness between the partially irradiated region and the region other than the partially irradiated region in the region that can be irradiated by the light emitting device 100 . When the contrast is high, the difference in brightness between the partially illuminated area and the area other than the partially illuminated area increases.

The N pole magnet 72 and the S pole magnet 73 are quadrangular prism-shaped members made of metal material or the like. The N pole magnet 72 is magnetized to the N pole, and the S pole magnet 73 is magnetized to the S pole. The N-pole magnets 72 and S-pole magnets 73 form pairs, and four pairs of N-pole magnets 72 and S-pole magnets 73 are fixed inside each side of the frame portion 71 by an adhesive member or the like. The N pole magnet 72 is a generic term for four N pole magnets, and the S pole magnet 73 is a generic term for four S pole magnets.

The base portion 74 is a member having a substantially rectangular frame shape in a plan view. The base portion 74 is fixed on the +Z side surface of the light-emitting portion mounting substrate 41 so that the light guide member 11 is arranged inside. The base portion 74 movably mounts the frame portion 71 on the +Z side surface. A wall portion 74a is provided on the outside portion of the base portion 74, that is, on the side opposite to the side facing the light guide member 11 (hereinafter simply referred to as the outside portion).

The spring 75 is an elastic member that can expand and contract along the center side direction of the light guide member 11 . The material of the spring 75 is not particularly limited, and a metal material, a resin material, or the like can be used. The springs 75 include four springs, and each spring is aligned with the central axis of the light guide member 11 when the central axis 11c of the light guide member 11 and the central axis of the light emitting surface 1a of the light emitting section 1 substantially coincide with each other. It is provided so as to surround the light guide member 11 at a position axially symmetrical with respect to 11c. In other words, each spring is provided so as to surround the light guide member 11 at a point-symmetrical position with respect to the center of the transparent member 54 in plan view. Spring 75 is a generic term for four springs.

One end of the spring 75 is connected to the outer surface of the frame portion 71, and the other end is connected to the wall portion 74a of the base portion 74, respectively. The frame portion 71 is movable on the mounting surface of the base portion 74 together with the light guide member 11 . The spring 75 restricts the movement of the frame portion 71 so that it does not move too much, and imparts a restoring force to the frame portion 71 to return the frame portion 71 to the initial position.

The coil 76 is a member capable of conducting an electric current, and is configured by winding a wire or the like in a helical or spiral shape. Coil 76 includes four coils, and coil 76 is a generic designation for four coils. Four coils are paired with each set of four north pole magnets 72 and four south pole magnets 73 . Each of the four coils is arranged on the opposite side of each set of the four N-pole magnets 72 and S-pole magnets 73 with the wall portion 74a and the spring 75 interposed therebetween. fixed on the surface.

For example, when a current i is supplied to the coil 76 from an external driving circuit as shown in FIG. An electromagnetic force 76a is generated in the direction. The white arrow representing the electromagnetic force 76a indicates the direction in which the electromagnetic force 76a acts. As the frame portion 71 is pushed by the electromagnetic force 76a, the frame portion 71 moves in the pushed direction.

The magnitude of the electromagnetic force 76a changes according to the amount of current flowing through the coil 76, and the amount of movement of the frame portion 71 changes. Also, the direction of the electromagnetic force 76a changes according to the direction of the current flowing through the coil 76, and the moving direction of the frame portion 71 changes. For example, when a current flows in the direction opposite to the direction in which the current i shown in FIG. 6A flows, an electromagnetic force is generated in the direction opposite to the direction indicated by the white arrow of the electromagnetic force 76a. At this time, the frame portion 71 moves in a direction in which the frame portion 71 is attracted by the generated electromagnetic force 76a.

The moving mechanism 70 generates an electromagnetic force for each pair of the coils 76 and the N-pole magnets 72 and S-pole magnets 73 according to the amount and direction of current flowing through each of the four coils 76 . The moving mechanism 70 relatively moves the light guide member 11 with respect to the light emitting section 1 along the direction intersecting the central axis 1c of the light emitting surface 1a by the generated electromagnetic force. In other words, the moving mechanism 70 can relatively move the light guide member 11 with respect to the light emitting section 1 within the XY plane intersecting the +Z direction. The direction intersecting the central axis 1c of the light emitting surface 1a is, for example, a direction perpendicular or substantially perpendicular to the central axis 1c of the light emitting surface 1a. “Substantially orthogonal” means that deviation from orthogonality, which is generally recognized as an error, is allowed in relative movement. Similarly, the XY plane that intersects the +Z direction is the XY plane that is orthogonal or substantially orthogonal to the +Z direction.

The moving mechanism 70 moves the light guide member 11 relative to the light emitting section 1 so that the light emitting surface 1a of the light emitting section 1 is inside the total reflection section 23 which is formed in a substantially rectangular frame shape in plan view. be able to.

By relatively moving the light guide member 11 while the light emitting section 1 is emitting light, the light emitting device 100 can continuously change the direction of the partial illumination light.

In this embodiment, an electromagnetic actuator is used as the moving mechanism 70, but the driving method of the moving mechanism 70 is not limited to this, and other driving methods such as a piezoelectric actuator or an ultrasonic actuator may be used. can also be used.

The housing 51 is a substantially rectangular box-shaped member that can accommodate the light emitting unit 1, the light guide member 11, the moving mechanism 70, and the like inside. A portion of a housing of a smartphone or the like in which the light emitting device 100 is mounted may be used as the housing 51 . The housing 51 has an opening 52 and a holding portion 53 .

The opening 52 is formed in a substantially circular shape in plan view. The opening 52 is preferably formed larger than the Fresnel lens portion 31 so that the Fresnel lens portion 31 of the light guide member 11 is exposed. The −Z side surface of the holding portion 53 is fixed to the +Z side surface of the light emitting portion mounting substrate 41 by an adhesive member or the like.

The housing 51 is preferably made of a member having a light shielding property, and contains a filler such as a light reflecting member or a light absorbing member so as to limit the light distribution direction of the light emitted from the light emitting device 100. It is preferable to configure with a resin material or the like.

The transparent member 54 is a plate-like member that contains a resin material or a glass material that is optically transmissive to at least the light emitted by the light emitting section 1 and that is substantially circular in plan view. The transparent member 54 is arranged on the +Z side of the light guide member 11 and is supported in a state of entering the opening 52 of the housing 51 . Note that the transparent member 54 may be adhered to the housing 51 by an adhesive member or the like.

The transparent member 54 transmits the light emitted from the light guide member 11 through the Fresnel lens portion 31 . After being emitted from the light guide member 11 , the light transmitted through the transparent member 54 becomes light emitted from the light emitting device 100 .

By housing the light emitting unit 1, the light guide member 11, the moving mechanism 70, and the like inside the space surrounded by the light emitting unit mounting substrate 41, the housing 51, and the transparent member 54, the light emitting unit 1, the light guide member 11, and the moving mechanism It is possible to prevent foreign matter such as dirt and dust from adhering to the mechanism 70 or the like, or from colliding with the foreign matter.

The shape of each of the housing 51 and the transparent member 54 is not limited to those described above. , a substantially elliptical or substantially polygonal transparent member may be used.

(Configuration example of light emitting unit 1)
FIG. 8 is a cross-sectional view showing an example of the configuration of the light emitting section 1. As shown in FIG. FIG. 9A is a cross-sectional view showing another example of the configuration of the light emitting section 1 as the light emitting section 1'. As shown in FIGS. 8 and 9A, the light-emitting unit 1 and the light-emitting unit 1′ have a light-emitting surface 1a on the +Z side and a mounting surface on the opposite side of the light-emitting unit mounting substrate 41. It is placed on the +Z side surface.

The light-emitting portion 1 includes a light-emitting element 2, a light-transmitting member 4 provided on the +Z side of the light-emitting element 2, and a side surface of the light-emitting element 2 and the light-transmitting member 4 except for the surface of the light-transmitting member 4 on the +Z side. and a covering member 5 covering the sides of the member 4 . In addition, the side surface of the translucent member 4 may be exposed from the covering member 5 like the light-emitting part 1' shown in FIG. 9A.

Preferably, at least a pair of positive and negative electrodes 3 are provided on the surface of the light emitting element 2 opposite to the light emitting surface 1a. In this embodiment, the shape of the light emitting unit 1 in plan view is substantially rectangular, but may be polygonal such as substantially circular, substantially elliptical, substantially triangular, or substantially hexagonal.

The light-emitting element 2 is preferably made of various semiconductors such as III-V group compound semiconductors and II-VI group compound semiconductors. As the semiconductor, it is preferable to use a nitride semiconductor such as _{InXAlYGa1 -X-YN (} 0≤X, 0≤Y, X+Y≤1). , InGaAlN, etc. can also be used.

The translucent member 4 is a plate-shaped member that is substantially rectangular in plan view, and is provided so as to cover the upper surface of the light emitting element 2 . The translucent member 4 can be formed using a translucent resin material or an inorganic material such as ceramics or glass. Thermosetting resins such as silicone resins, silicone-modified resins, epoxy resins, and phenol resins can be used as the resin material. In particular, silicone resins or modified resins thereof, which are excellent in light resistance and heat resistance, are suitable. It should be noted that the translucency here preferably means that 60% or more of the light from the light emitting element 2 is transmitted.

Further, the translucent member 4 can be made of thermoplastic resin such as polycarbonate resin, acrylic resin, methylpentene resin, polynorbornene resin.

Furthermore, the translucent member 4 may be composed of the above resin and a wavelength conversion member that converts the wavelength of at least part of the light from the light diffusion member or the light emitting element 2 . As the translucent member 4 made of a resin and a wavelength conversion member, a resin material, ceramics, glass, or the like containing a wavelength conversion member, a sintered body of the wavelength conversion member, or the like can be used. The translucent member 4 may be formed by forming a resin layer containing a wavelength converting member and a light diffusing member on the −Z side surface of a molding made of resin, ceramics, glass, or the like.

In the light-emitting device according to the embodiment, a blue light-emitting element is used as the light-emitting element 2, and the light-transmitting member 4 includes a wavelength conversion member that converts the wavelength of light emitted from the light-emitting element 2 into yellow, thereby emitting white light. .

As the wavelength conversion member included in the translucent member 4, for example, yttrium-aluminum-garnet-based phosphor (eg, _{Y3 (} Al, Ga) _5O12 :Ce), lutetium-aluminum-garnet-based phosphor ( For example, Lu ₃ (Al, Ga) ₅ O ₁₂ :Ce), terbium-aluminum-garnet-based phosphors (e.g., Tb ₃ (Al, Ga) ₅ O ₁₂ :Ce), CCA-based phosphors (e.g., Ca _{10 ( PO4} ) _6Cl2 :Eu), SAE phosphors ₍ e.g. _Sr4Al14O25 : _Eu ), _{chlorosilicate} phosphors ₍ e.g. _{Ca8MgSi4O16Cl2} : _Eu ), nitrides phosphors, fluoride phosphors, phosphors having a perovskite structure (e.g. CsPb(F,Cl,Br,I) ₃ ), quantum dot phosphors (e.g. CdSe, InP, AgInS ₂ or AgInSe ₂ ), etc. can be used. Examples of nitride phosphors include β-sialon phosphors (eg, (Si, Al) ₃ (O, N) ₄ :Eu), α-sialon phosphors (eg, Ca(Si, Al) ₁₂ (O , N) ₁₆ :Eu), SLA-based phosphors (eg, SrLiAl ₃ N ₄ :Eu), CASN-based phosphors (eg, CaAlSiN ₃ :Eu) and SCASN-based phosphors (eg, (Sr, Ca)AlSiN ₃ :Eu), etc. Examples of fluoride-based phosphors include KSF-based phosphors (e.g., K ₂ SiF ₆ :Mn) and KSAF-based phosphors (e.g., K ₂ (Si, Al) F ₆ :Mn). and MGF-based phosphors (eg, 3.5MgO·0.5MgF ₂ ·GeO ₂ :Mn). The phosphors described above are particles. Also, one of these wavelength conversion members can be used alone, or two or more of these wavelength conversion members can be used in combination.

The KSAF-based phosphor may have a composition represented by the following formula (I).

_{M2 [ SipAlqMnrFs ] (} I)

In formula (I), M represents an alkali metal and may contain at least K. Mn may be a tetravalent Mn ion. p, q, r and s may satisfy 0.9≤p+q+r≤1.1, 0<q≤0.1, 0<r≤0.2, 5.9≤s≤6.1. Preferably, 0.95≦p+q+r≦1.05 or 0.97≦p+q+r≦1.03, 0<q≦0.03, 0.002≦q≦0.02 or 0.003≦q≦0.015 , 0.005≦r≦0.15, 0.01≦r≦0.12 or 0.015≦r≦0.1, 5.92≦s≦6.05 or 5.95≦s≦6.025 can be For example, _{K2 [ Si0.946Al0.005Mn0.049F5.995 ]} , _{K2 [ Si0.942Al0.008Mn0.050F5.992 ]} , _{K2 [ Si0 . 939} Al _0.014 Mn _0.047 F _5.986 ]. With such a KSAF-based phosphor, it is possible to obtain red light emission with high brightness and a narrow half-value width of the emission peak wavelength.

As the light diffusing member contained in the translucent member 4, for example, titanium oxide, barium titanate, aluminum oxide, silicon oxide, or the like can be used.

The covering member 5 is a member that covers the side surfaces of the light emitting element 2 and the translucent member 4 , and directly or indirectly covers the side surfaces of the light emitting element 2 and the translucent member 4 . The upper surface of the translucent member 4 is exposed from the covering member 5 and constitutes the light emitting surface 1 a of the light emitting section 1 .

In order to improve the light extraction efficiency, the covering member 5 is preferably made of a member having a high light reflectance. For the coating member 5, for example, a resin material containing a light-reflecting substance such as a white pigment can be used.

Light reflecting substances include titanium oxide, zinc oxide, magnesium oxide, magnesium carbonate, magnesium hydroxide, calcium carbonate, calcium hydroxide, calcium silicate, magnesium silicate, barium titanate, barium sulfate, aluminum hydroxide, aluminum oxide, Zirconium oxide, silicon oxide and the like can be mentioned, and it is preferable to use one of these alone or two or more of them in combination.

As the resin material, it is preferable to use a resin material containing a thermosetting resin such as an epoxy resin, a silicone resin, a silicone-modified resin, or a phenol resin as a main component. The covering member 5 may be made of a member that transmits visible light, if necessary.

It is preferable that the light-emitting unit mounting substrate 41 is provided with a wiring 42 arranged on at least one of the surface and the inside. In the light-emitting unit mounting substrate 41, the wiring 42 and at least the pair of positive and negative electrodes 3 of the light-emitting unit 1 are connected via the conductive adhesive member 62, thereby electrically connecting the light-emitting unit mounting substrate 41 and the light-emitting unit 1. do. The wiring 42 of the light-emitting unit mounting board 41 is set according to the configuration and size of the electrodes 3 of the light-emitting unit 1 .

The light-emitting unit mounting substrate 41 is preferably made of an insulating material, preferably made of a material that does not easily transmit the light emitted from the light-emitting unit 1 or external light, and is preferably made of a material having a certain degree of strength. preferable. Specifically, the light emitting unit mounting board 41 can be made of ceramics such as alumina, aluminum nitride, mullite, phenol resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), polyphthalamide resin, or the like. can.

The wiring 42 can be made of copper, iron, nickel, tungsten, chromium, aluminum, silver, gold, titanium, palladium, rhodium, alloys thereof, or the like. In addition, from the viewpoint of wettability and/or light reflectivity of the conductive adhesive member 62, the surface layer of the wiring 42 may be provided with a layer of silver, platinum, aluminum, rhodium, gold, or an alloy thereof. good.

Further, as described above, one light-emitting portion 1 may have a plurality of light-emitting surfaces 1a in plan view. FIG. 9B is a plan view showing an example of the configuration of the light emitting section 1 having a plurality of light emitting surfaces 1a viewed from the light guide member 11 side. As shown in FIG. 9B, the light-emitting portion 1 has nine light-emitting surfaces 1a arranged vertically and horizontally or in a grid pattern in plan view. Each of the nine light-emitting surfaces 1a includes the light-emitting element 2, the light-transmitting member 4 provided on the +Z side of the light-emitting element 2, and the surface of the light-emitting element 2 except for the +Z-side surface of the light-transmitting member 4. A covering member 5 covering the side surface and the side surface of the translucent member 4 is included. 9A, the side surface of the translucent member 4 on the light emitting surface 1a may have a portion not covered with the covering member 5, similarly to the light emitting portion 1' shown in FIG. 9A. That is, at this time, adjacent light-emitting elements 2 are provided with a common translucent member 4 . The plurality of light-emitting surfaces 1a, more specifically, the light-emitting elements 2 corresponding to the plurality of light-emitting surfaces 1a can be controlled to light up independently. In addition, although FIG. 9B illustrates nine light emitting surfaces 1a arranged vertically and horizontally or in a grid pattern, the arrangement and number of light emitting surfaces 1a are not limited to this, and can be changed as appropriate. .

(Example of change in optical path and illuminance distribution of irradiation light due to relative movement)
Changes in the optical path of the irradiation light and the illuminance distribution accompanying movement of the light guide member 11 by the movement mechanism 70 will be described with reference to FIGS. 10 to 17 .

FIG. 10 is a cross-sectional view showing an example of the optical path of the light emitting device 100 when the light guide member 11 is not moved, and shows a state where the housing 51 and the transparent member 54 are omitted. A plan view of the light emitting device 100 in this state is similar to FIG. 6A.

In the state of the light emitting device 100 shown in FIG. 10, no current is flowing through the coil 76, the frame portion 71 is still at the initial position together with the light guide member 11, and the center axis 1c of the light emitting surface 1a and the light guide member 11 are aligned. substantially coincides with the central axis 11c of the .

The light L emitted from the light emitting unit 1 passes through each of the first incident portion 12 and the second incident portion 13, is guided inside the light guide member 11, is condensed, and passes through the Fresnel lens portion 31. The light is emitted from the inside of the light guide member 11 to the outside. At this time, most of the light L does not pass through the third incident portion 14 and does not reach the total reflection portion 23 . A central axis Le of light emitted from the Fresnel lens portion 31 substantially coincides with each of the central axis 1 c of the light emitting surface 1 a and the central axis 11 c of the light guide member 11 .

FIG. 11 is a schematic diagram showing an example of the illuminance distribution of irradiation light in the light emitting device 100 of FIG. As shown in FIG. 11 , the partial irradiation region 210 by irradiation light is located near the center of the irradiation possible region 200 . The size of the irradiable region 200, the size ratio between the irradiable region 200 and the partial irradiation region 210, and the like are determined by the shapes of the first incident portion 12, the second incident portion 13, and the Fresnel lens portion 31 in the light guide member 11. , can be appropriately set by determining the distance between the light guide member 11 and the light emitting section 1, and the like.

FIG. 12 is a diagram showing an example of the positional relationship between the light guide member 11 and the light emitting section 1 in a state where the light guide member 11 is moved to one side, ie, the -X side, in the light emitting device 100. FIG. 51 and a transparent member 54 are omitted, and is a plan view of the light guide member 11 side. FIG. FIG. 13 is a cross-sectional view showing an example of optical paths of the light emitting device 100 of FIG.

In the state of the light emitting device 100 shown in FIGS. 12 and 13, the current i flows from the outside to the inside (hereinafter referred to as forward direction) in the coil arranged on the +X side among the four coils 76. and generates an electromagnetic force 76a toward the -X side. The frame portion 71 is pushed to the -X side by the electromagnetic force 76a together with the light guide member 11, and the central axis 11c of the light guide member 11 is shifted to the -X side with respect to the central axis 1c of the light emitting surface 1a. ing.

Note that while the light guide member 11 is moving to the -X side, no current flows through the coils arranged on the +Y side, the -Y side, and the -X side among the four coils 76. . However, a current may flow from the inside to the outside (hereinafter referred to as the reverse direction) to the coils arranged on the -X side. As a result, the electromagnetic force 76a can be further increased compared to the case where the current is applied only to the coil arranged on the +X side.

The light L emitted from the light emitting section 1 is condensed by being guided inside the light guide member 11 through each of the first incident section 12, the second incident section 13, and the third incident section 14. . The light L that has passed through each of the first incident portion 12 and the second incident portion 13 passes through the Fresnel lens portion 31 and exits from the inside of the light guide member 11 to the outside. On the other hand, the light L that has passed through the third incident portion 14 is reflected by the total reflection portion 23 and then passes through the Fresnel lens portion 31 to be emitted from the inside of the light guide member 11 to the outside. The central axis Le of the emitted light is inclined at an angle θ1 with respect to the central axis 11c of the light guide member 11 according to the deviation between the central axis 11c of the light guide member 11 and the central axis 1c of the light emitting surface 1a. . In this embodiment, even when the light guide member 11 moves with respect to the light emitting unit 1, the central axis 11c of the light guide member 11 maintains a state substantially parallel to the central axis 1c of the light emitting surface 1a. do.

The relationship between the amount of current i and the amount of movement of the light guide member 11 can be appropriately set by determining the number of turns of the coil 76, the magnetic force of the N pole magnet 72 and the S pole magnet 73, and the like. The angle θ1 of the central axis Le of the light emitted from the light guide member 11 according to the amount of movement of the light guide member 11 is can be appropriately set by determining the shape of , the distance between the light guide member 11 and the light emitting portion 1, and the like.

FIG. 14 is a schematic diagram showing an example of the illuminance distribution of irradiation light in the light emitting device 100 of FIG. As shown in FIG. 14, the partial irradiation region 210 by irradiation light is arranged at a position shifted from the center of the irradiation possible region 200 according to the angle θ1.

Next, FIG. 15 is a diagram showing an example of the positional relationship between the light guide member 11 and the light emitting section 1 in a state where the light guide member 11 is moved to the other side, that is, the +X side, in the light emitting device 100. FIG. 3 is a plan view of a state in which a housing 51 and a transparent member 54 are omitted, viewed from the light guide member 11 side; 16 is a cross-sectional view showing an example of the optical path of the light emitting device 100 of FIG. 15. FIG.

In the state of the light emitting device 100 shown in FIGS. 15 and 16, the current i is flowing in the forward direction in the coil arranged on the -X side among the four coils 76, and the electromagnetic force 76b toward the +X side is generated. It has occurred. The central axis 11c of the light guide member 11 is shifted to the +X side with respect to the central axis 1c of the light emitting surface 1a by moving the frame portion 71 together with the light guide member 11 by being pushed to the +X side by the electromagnetic force 76b. .

Note that while the light guide member 11 is moving to the +X side, no current flows through the coils arranged on the +Y side, the −Y side, and the +X side among the four coils 76 . However, the current may flow in the opposite direction to the coil arranged on the +X side. As a result, the electromagnetic force 76b can be further increased compared to the case where the current is applied only to the coil arranged on the -X side.

The light L emitted from the light emitting section 1 is condensed by being guided inside the light guide member 11 through each of the first incident section 12, the second incident section 13, and the third incident section 14. . The light L that has passed through each of the first incident portion 12 and the second incident portion 13 passes through the Fresnel lens portion 31 and exits from the inside of the light guide member 11 to the outside. On the other hand, the light L that has passed through the third incident portion 14 is reflected by the total reflection portion 23 , passes through the Fresnel lens portion 31 , and is emitted from the inside of the light guide member 11 to the outside. The central axis Le of the emitted light is inclined at an angle θ2 with respect to the central axis 11c of the light guide member 11 according to the deviation between the central axis 11c of the light guide member 11 and the central axis 1c of the light emitting surface 1a. .

FIG. 17 is a schematic diagram showing an example of the illuminance distribution of irradiation light in the light emitting device 100 of FIG. As shown in FIG. 17, the partial irradiation region 210 by irradiation light is arranged at a position shifted from the center of the irradiation possible region 200 according to the angle θ2.

10 to 17, the light-emitting device 100 includes one light-emitting portion 1 (in other words, one light-emitting surface 1a). is relatively moved with respect to the light emitting unit 1. FIG. When the light-emitting device 100 includes a plurality of light-emitting surfaces 1a, at least the light-emitting surface 1a that emits light among the plurality of light-emitting surfaces 1a is inside the total reflection portion 23 in plan view (more specifically, a frame shape in plan view). The light guide member 11 may be relatively moved with respect to the plurality of light emitting surfaces 1a or the plurality of light emitting portions 1 by the moving mechanism 70 so that the light guide member 11 is positioned inside the lowermost portion 16 of the light guide member 11 .

(Action of Fresnel lens portion 31)
18 to 21 are diagrams for explaining the action of the Fresnel lens portion 31. FIG. 18 is a cross-sectional view showing the optical path of a light emitting device 100W according to another example of the embodiment, and FIG. 19 is a schematic diagram showing the illuminance distribution of irradiation light in the light emitting device 100W of FIG. 20 is a cross-sectional view showing an example of the optical path of the light emitting device 100 according to the embodiment, and FIG. 21 is a schematic diagram showing an example of the illuminance distribution of the irradiation light in the light emitting device 100 of FIG.

As shown in FIG. 18, the light emitting device 100W has a light guide member 11W with no Fresnel lens on the output side. FIG. 18 shows an arrangement in which the central axis 11cW of the light guide member 11W is shifted to the +X side with respect to the central axis 1acW of the light emitting surface 1aW in order to irradiate the partial irradiation light from the light emitting device 100W in a direction inclined to the +X side. showing.

The light that has entered the outer region (in other words, the third incident portion 14W) of the light guide member 11W from the light emitting portion 1W is reflected by the total reflection portion 23W, passes through the emission plane 24W, and exits the light guide member 11W to the outside. , in a direction inclined to the +X side, and reaches the partial irradiation area 210W in the irradiation possible area 200W, as shown in FIG.

On the other hand, the light incident on the inner region (in other words, the first incident portion 12W and the second incident portion 13W) in the light guide member 11W from the light emitting portion 1W is substantially collimated without passing through the total reflection portion 23W. The light is emitted to the outside from the light guide member 11W through the emission plane 24W, and reaches the central area 211W in the irradiable area 200W as shown in FIG.

On the other hand, FIG. 20 shows an arrangement in which the central axis 11c of the light guide member 11 is shifted to the +X side with respect to the central axis 1ac of the light emitting surface 1a in order to tilt the partial irradiation light from the light emitting device 100 to the +X side. .

The light that has entered the outer region (in other words, the third incident portion 14 ) in the light guide member 11 from the light emitting portion 1 is reflected by the total reflection portion 23 , enters the Fresnel lens portion 31 , and enters the Fresnel lens portion 31 . The light is emitted to the outside from the light guide member 11 in a direction inclined to the +X side due to refraction or diffraction. Then, as shown in FIG. 21, it reaches the partial irradiation area 210 in the irradiation possible area 200 .

On the other hand, the light incident on the inner region (in other words, the first incident portion 12 and the second incident portion 13) in the light guide member 11 from the light emitting portion 1 is substantially parallelized without passing through the total reflection portion 23. The light enters the Fresnel lens portion 31 and is emitted to the outside from the light guide member 11 in a direction inclined to the +X side due to the refraction or diffraction action of the Fresnel lens portion 31 . Then, as shown in FIG. 21, it reaches the partial irradiation area 210 in the irradiation possible area 200 .

In the light emitting device 100W, by moving the light guide member 11W relative to the light emitting portion 1W, the light incident on the outer region inside the light guide member 11W from the light emitting portion 1W is collected by the total reflection portion 23W and can be irradiated. Areas of interest in area 200W can be partially illuminated. In the light-emitting device 100 , the light incident on the inner region inside the light guide member 11 from the light-emitting section 1 can be tilted by the refraction or diffraction action of the Fresnel lens section 31 , so that the central region 211 in the irradiable region 200 Reaching light can be suppressed, and only a desired region in the irradiable region 200 can be appropriately partially irradiated.

For example, if the shape of the Fresnel lens portion 31 is determined so that the light incident on the inner region in the light guide member 11 from the light emitting portion 1 has a greater refractive power (power), the light reaches the central region 211 in the irradiable region 200. It is possible to further suppress the light that is emitted. As a result, only the desired region in the irradiable region 200 can be more appropriately partially irradiated, which is more preferable. By using the Fresnel lens portion 31, even if the refractive power is increased, the light guide member 11 does not become thick, and thus an increase in the size of the light emitting device 100 can be avoided.

(Example of optical path and illuminance distribution for each light passing through different regions of light guide member 11)
22 to 36 are diagrams showing optical paths and illuminance distributions for each light passing through different regions of the light guide member 11. FIG. The different regions of the light guide member 11 specifically refer to three regions, A region, B region, and C region. The A region is a region through which light incident on the light guide member 11 through each of the first incident portion 12 and the second incident portion 13 passes. Area B is an area through which light exits without passing through the total reflection portion 23 after being incident on the light guide member 11 through the third incident portion 14 . Area C is an area through which light emitted through the total reflection portion 23 passes after being incident on the light guide member 11 through the third incident portion 14 .

22 to 26 are diagrams showing, as a first example, a state in which the light guide member 11 is not moved. 22 is a diagram showing the optical path of the light emitting device 100, FIG. 23 is a schematic diagram of the illuminance distribution of light passing through the A region, FIG. 24 is a schematic diagram of the illuminance distribution of the light passing through the B region, and FIG. 26 is a schematic diagram of an illuminance distribution obtained by synthesizing the illuminance distributions of FIGS. 23 to 25. FIG.

27 to 31 are diagrams showing, as a second example, a state in which the light guide member 11 moves in the X direction or the Y direction in plan view, that is, in the lateral direction. 27 is a diagram showing the optical path of the light-emitting device 100, FIG. 28 is a schematic diagram of the illuminance distribution of light passing through the A region, FIG. 29 is a schematic diagram of the illuminance distribution of the light passing through the B region, and FIG. 31 is a schematic diagram of an illuminance distribution obtained by synthesizing the illuminance distributions of FIGS. 28 to 30. FIG.

32 to 36 are diagrams showing, as a third example, the state in which the light guide member 11 moves in the diagonal direction in plan view, that is, in the corner direction of the frame portion 71. FIG. 32 is a diagram showing the optical path of the light emitting device 100, FIG. 33 is a schematic diagram of the illuminance distribution of light passing through the A region, FIG. 34 is a schematic diagram of the illuminance distribution of the light passing through the B region, and FIG. 36 is a schematic diagram of an illuminance distribution obtained by synthesizing the illuminance distributions of FIGS. 28 to 30. FIG.

22 to 36 all show simulation results. In the optical path diagrams shown in FIGS. 22, 27, and 32, light La passing through region A is indicated by a solid arrow, light Lb passing through region B is indicated by a broken arrow, and light Lc passing through region C is indicated by a dashed-dotted arrow. , respectively.

As shown in FIGS. 27 to 36, when the light guide member 11 moves in the horizontal direction and in the corner direction of the frame 71, the light passing through any of the regions A, B, and C is , a desired partial irradiation area 210 in the lateral direction and in the corner direction of the frame portion 71 can be selectively irradiated within the irradiation possible area 200 . As shown in FIGS. 22 to 26, when the light guide member 11 does not move, the amount of light passing through the area A increases. can be selectively irradiated.

(Example of positional relationship between light guide member 11 and light emitting unit 1 in height direction)
37 to 40 are diagrams illustrating the positional relationship between the light guide member 11 and the light emitting section 1 in the height direction. Note that the height direction corresponds to the Z direction.

FIG. 37 is a diagram showing, as a first example, a state in which the lowest portion 16 of the light guide member 11 is on the +Z side of the light emitting section 1. As shown in FIG. Here, the lowermost portion 16 refers to the portion of the light guide member 11 that is closest to the -Z side. FIG. 38 is a diagram showing, as a second example, a state in which the lowest portion 16 of the light guide member 11 is on the −Z side of the light emitting section 1. As shown in FIG. FIG. 39 shows a state in which the light emitted by the light emitting section 1 leaks out without entering the light guiding member 11 while the light guiding member 11 is moved to the +X side with respect to the light emitting section 1. FIG. It is a figure shown as three examples. FIG. 40 shows a state in which the light emitted by the light emitting section 1 does not enter the light guiding member 11 and does not leak out while the light guiding member 11 is moved to the +X side with respect to the light emitting section 1 . It is a figure shown as four examples.

The shortest distance h shown in each of FIGS. 37 to 40 means the shortest distance between the light emitting surface 1a of the light emitting section 1 and the light guide member 11 along the direction substantially orthogonal to the light emitting surface 1a. The shortest distance h is, in other words, the distance between the light emitting surface 1a and the lowermost portion 16. FIG.

In this embodiment, the shortest distance h is preferably 0.0 [mm] or more and 1.0 [mm] or less. However, the shortest distance h is not only the distance between the light emitting surface 1a and the lowermost portion 16 when the lowermost portion 16 of the light guide member 11 is on the +Z side of the light emitting surface 1a (see FIG. 37), but also When the surface 1a does not contact the light guide member 11, the distance between the light emitting surface 1a and the lowermost portion 16 when the lowermost portion 16 of the light guide member 11 is on the -Z side of the light emitting surface 1a (see FIG. 38) ) is also included.

With this configuration, the light emitting device 100 can be made thinner. Further, when the light emitting portion 1 faces the first incident portion 12 provided in the center of the light guide member 11, most of the light incident on the light guide member 11 does not reach the total reflection portion 23. can be suppressed, and the light-emitting device 100 can partially illuminate a desired region of the irradiable region 200 more accurately.

On the other hand, as shown in FIG. 39, when the light guide member 11 is moved to the +X side with respect to the light emitting section 1, depending on the shortest distance h, the light emitted from the light emitting section 1 is emitted at a wide angle. There is a concern that the light L<b>1 thus obtained may leak out without being incident on the light guide member 11 .

Therefore, the shortest distance h is more preferably 0.0 [mm] or more and 0.4 [mm] or less. With this configuration, as shown in FIG. 40, even when the light guide member 11 is moved to the +X side with respect to the light emitting unit 1, the light L1 emitted at a wide angle can be made incident on the light guide member 11. . As a result, the size of the light emitting device 100 can be reduced, and a decrease in light utilization efficiency due to leakage of the light emitted by the light emitting section 1 from the light guide member 11 can be suppressed.

(Example)
Next, an optical simulation performed using a model of the light emitting device of the example will be described. In addition, the light-emitting device according to the embodiment is not limited to the following examples.

Using a model of the light-emitting device 100 of the example, the illuminance distribution when the light-emitting section 1 is turned on was obtained by simulation under the following conditions.

[Simulation conditions]
Size of light emitting surface of light emitting unit 1: 0.7 [mm] x 0.7 [mm]
Size of light receiver for evaluation: 429 [mm] × 572 [mm]
Distance between light emitting device and light receiver for evaluation: 300.0 [mm]
Angle of view of light receiver for evaluation: 100 [degrees]
Shortest distance between light emitting surface 1a of light emitting unit 1 and light guide member 11: 0.1 [mm]

Each of FIGS. 41 to 43 is a diagram showing the relationship between the movement amount of the light guide member and the illuminance distribution in the light emitting device. 41 shows a first embodiment, FIG. 42 shows a second embodiment, and FIG. 43 shows a comparative example. Example 1 is based on the light emitting device 100 having the light guide member 11 according to the embodiment. A second example is a light emitting device having a light guide member 11' according to the embodiment. The light guide member 11' has a flat surface on the guided light exit side (the side opposite to the light incident side), and for example, the light guide member 11W shown in FIG. 18 can be applied. The comparative example is a light emitting device having a light guide member 11'' having a Fresnel lens portion on the incident side and a flat surface on the exit side.

In each of FIGS. 41 to 43, a positional relationship P indicates the positional relationship between the light emitting section and the light guide member 11 in plan view. The movement amount ΔX indicates the relative movement amount [mm] in the X direction, and the movement amount ΔY indicates the relative movement amount [mm] in the Y direction. In the examples of FIGS. 41 to 43, only ΔY is changed in increments of 0.2 [mm].

Further, the illuminance distribution S indicates the illuminance distribution of the irradiated light in the light emitting device, and the cross-sectional illuminance distribution I is the cross-sectional illuminance distribution (X=0.0 [mm]) of the irradiated light along the Y direction, that is, a square It shows the illuminance distribution of the irradiation light in a cross section including the midpoints of the two opposing sides of the light emitting surface 1a having a shape and the central axis of the irradiation light. The horizontal axis of the graph showing cross-sectional illuminance distribution I ranges from -90.0 [degree] to +90. [degree] indicates the light distribution angle, and the vertical axis indicates the illuminance. The vertical axis uniformly indicates the illuminance range, that is, the minimum and maximum illuminance values in all the graphs of FIGS. 41 to 43 .

As shown in FIG. 41, in the first example, the position of the partial irradiation light and the light distribution angle at which the illuminance peaks changed according to the change in the movement amount ΔY. Also, the illuminance distribution of the partial irradiation light was maintained in substantially the same state even when the amount of movement ΔY was changed. The peak illuminance of the partial irradiation light also remained substantially the same and maintained a high peak even when the amount of movement ΔY was changed.

Further, as shown in FIG. 42, in the second example, the position of the partial irradiation light and the light distribution angle at which the illuminance peaks changed according to the change in the movement amount ΔY.

On the other hand, as shown in FIG. 43, in the comparative example, it was confirmed that the position of the partial irradiation light and the light distribution angle at which the illuminance peaked did not change according to the change in the movement amount ΔY. The illuminance distribution and peak illuminance of the partial irradiation light were not maintained due to the change in the amount of movement ΔY.

From these facts, it was confirmed that it was difficult to properly perform partial irradiation in the comparative example, whereas it was possible to properly perform partial irradiation in the first and second examples. Moreover, in the first embodiment, it was confirmed that the position and light distribution angle of the partial irradiation light can be controlled by the amount of relative movement, and that partial irradiation can be performed more appropriately.

Here, an example of dimensions of the light emitting device 100 according to the embodiment will be described with reference to FIGS. 44A to 44C. 44A is a cross-sectional view illustrating an example of dimensions of the light emitting device 100. FIG. FIG. 44B is a partially enlarged view of area Q in FIG. 44A. FIG. 44C is a perspective view of the light guide member 11 viewed from the -Z direction side.

44A, Wt represents the overall size (width) of the light guide member 11, AL represents the size of the light emitting surface 1a in the light emitting section 1 (the length of one side of the square), and Tt represents the size of the light guide member 11 as a whole. represents thickness.

In FIG. 44B, Fp represents the pitch of the Fresnel lens portion 31 (interval between adjacent concentric outer peripheral portions), and FA represents the angle of the lens surface of the Fresnel lens portion 31 with respect to the X direction. The pitch of the Fresnel lens portion 31 and the angle of the lens surface with respect to the X direction can be appropriately adjusted depending on the positions where each of the plurality of convex portions of the Fresnel lens portion 31 is provided. In1 represents the size (width) of the first incident portion 12, In2 represents the size (width) of the frame portion of the second incident portion 13, η1 represents the angle of the third incident portion 14, and η2 represents the total reflection portion. It represents 23 angles. η1 is the angle between the line connecting the extreme points in the Z direction of the third incident portion 14 and the line along the X direction, and η2 is the line connecting the extreme points in the Z direction of the total reflection portion 23. and a line along the X direction.

In FIG. 44C , Ar1 (hatched portion) represents the area of the third incident portion 14 and Ar2 (dotted portion) represents the area of the total reflection portion 23 .

Table 1 shown below is a list showing an example of each dimension in the light emitting device 100 .

In Table 1, "Range" indicates the range that can be adopted for each item. For example, "a square with a side of 0.2 mm to 3.0 mm" indicated by the size AL of the light emitting surface 1a in the light emitting unit 1 represents a "square with a side of 0.2 mm or more and 3.0 mm or less". ing. The meaning of "-" is the same for items other than the size AL of the light emitting surface 1a.

As an example, by constructing the light-emitting device 100 with the dimensions shown in Table 1, the effects of the light-emitting device 100 described below can be obtained.

(Effects of Light Emitting Device 100)
As described above, the light-emitting device 100 according to the present embodiment includes the light-emitting portion 1 having the light-emitting surface 1a, the total reflection portion 23 for reflecting the incident light from the light-emitting portion 1, and the light reflected by the total reflection portion 23. light guide member 11 for guiding the incident light, and the light guide member 11 with respect to the light emitting unit 1 along the direction intersecting the central axis 1c of the light emitting surface 1a. and a moving mechanism 70 for moving relative to each other.

Since the light guide member 11 has the total reflection portion 23, the light emitted from the light emitting portion 1 can also be collected at a wide angle, and the light from the light emitting portion 1 can be efficiently extracted to the outside. be able to. Thereby, a large amount of light emitted from the light emitting device 100 can be ensured.

Further, by moving the light guide member 11 relative to the light emitting section 1, the light irradiation direction can be changed, and a desired position and direction can be partially irradiated. Furthermore, since the distance between the light emitting section 1 and the light guide member 11 can be shortened, the size of the light emitting device 100 capable of partially illuminating a desired area in the irradiable area 200 can be reduced. Further, since a large area of the light emitting surface 1a in the light emitting section 1 can be ensured, a large amount of light emitted from the light emitting device 100 can be ensured.

As described above, the present embodiment can provide the light emitting device 100 that can change the irradiation direction of light and efficiently extract the light from the light emitting section 1 to the outside.

For example, when a device such as a smartphone or a camera is equipped with a light-emitting device, when the user manually moves the device itself to change the partial illumination area, the shooting area also changes. It may become difficult to partially irradiate a desired region such as the periphery of a person's face. In this embodiment, only the partial irradiation area 210 is changed by the moving mechanism 70 while the device is stationary, so that the operation of changing the partial irradiation area 210 can be easily performed.

Further, for example, if the partial irradiation area is changed by tilting the light guide member, the thickness of the light emitting device increases according to the tilt of the light guide member. In this embodiment, since the light guide member 11 is moved along the direction intersecting the central axis 1c of the light emitting surface 1a, it is possible to avoid the light emitting device 100 from becoming thicker than when the light guide member is tilted.

Moreover, in this embodiment, the light guide member 11 preferably has a Fresnel lens portion 31 on the side from which the guided light is emitted. Since the Fresnel lens portion 31 can accurately determine the direction of emitted light, the light emitting device 100 can accurately partially illuminate a desired area in the irradiable area 200 . In addition, since the Fresnel lens portion 31 makes it difficult for the light emitting portion 1 to be visually recognized from the outside, the appearance of the light emitting device 100 can be improved. However, the light guide member according to the present embodiment is not limited to one having the Fresnel lens portion 31 on the exit side of the guided light. A light guide member 11W (see FIG. 18) or the like having a flat surface on the exit side of the guided light may also be used. The effect of being able to take out well outside is acquired.

Further, in the present embodiment, the moving mechanism 70 preferably moves the light guide member 11 relative to the light emitting section 1 while the light emitting section 1 is emitting light. As a result, the area to be partially irradiated can be changed without switching the light emitting unit 1, so that the partial irradiation area 210 on the irradiable area 200 can be changed continuously without interrupting the partial irradiation.

For example, if the light-emitting device has a plurality of light-emitting units and selectively emits light from some of the plurality of light-emitting units to change the partial irradiation area, the partial irradiation is interrupted at the timing when the light emission of the light-emitting units is switched. Therefore, the change in the partial irradiation area becomes intermittent. If the partial irradiation area changes intermittently, there is a concern that it may be difficult to perform an operation to change the partial irradiation area when the light emitting device is installed in a device such as a smart phone. In this embodiment, the partial irradiation area 210 can be changed continuously, so that the operability of changing the partial irradiation area 210 can be further improved. In addition, when continuous shooting such as video shooting is required, if the partial irradiation area changes intermittently, the change will also be recorded, so there is a concern that the obtained video will be unnatural. In this embodiment, such unnaturalness can be improved.

In this embodiment, the total reflection portion 23 is provided in a substantially rectangular frame shape in plan view, and the moving mechanism 70 has the light emitting surface 1a of the light emitting portion 1 inside the total reflection portion 23 in plan view. It is preferable to move the light guide member 11 relative to the light emitting section 1 as shown in FIG. As a result, even if the light guide member 11 moves relative to the light emitting unit 1 , the light emitted from the light emitting surface 1 a can be prevented from leaking out of the light guide member 11 and reflected by the total reflection unit 23 . . As a result, it is possible to prevent light loss, stray light, and the like due to leakage of light from the light guide member 11 .

Further, in the present embodiment, the total reflection portion 23 is provided in a substantially rectangular frame shape in a plan view, and the light guide member 11 is provided inside the total reflection portion 23 provided in a substantially rectangular frame shape. It has an incident section 12 , a second incident section 13 and a third incident section 14 . Each of the first incident portion 12 , the second incident portion 13 and the third incident portion 14 preferably has a curved surface for condensing the incident light from the light emitting portion 1 . Due to the light condensing effect of the curved surface, the desired area of the irradiation area 200 by the light emitting device 100 can be partially irradiated more accurately than when the inside of the total reflection portion 23 is flat.

Further, in the present embodiment, each of the first incident portion 12, the second incident portion 13, and the third incident portion 14 provided inside the total reflection portion 23 in plan view has a plurality of curved surfaces having different radii of curvature. is preferably a curved surface of With this configuration, the light guide member 11 can be miniaturized, and a desired region of the irradiation-enabled region 200 by the light emitting device 100 can be more accurately partially irradiated.

Further, in the present embodiment, the total reflection portion 23 is provided in a substantially rectangular frame shape in plan view, and the area of the region inside the outer edge 231 of the total reflection portion 23 is larger than the light emitting surface 1a of the light emitting portion 1. is preferably large. With this configuration, when the light emitting section 1 faces the central region of the light guide member 11 (in other words, the first incident section 12), most of the light incident on the light guide member 11 does not reach the total reflection section 23. Spreading of light can be suppressed, and a desired region of the irradiation-enabled region 200 by the light-emitting device 100 can be partially irradiated more accurately.

Further, in the present embodiment, the shortest distance between the light emitting surface 1a of the light emitting section 1 and the light guide member 11 along the direction perpendicular to the light emitting surface 1a is 0.0 [mm] or more and 1.0 mm. It is preferably 0 [mm] or less. With this configuration, the light emitting device 100 can be made thinner. In addition, when the light emitting portion 1 faces the central region of the light guide member 11 (in other words, the first incident portion 12), most of the light incident on the light guide member 11 does not reach the total reflection portion 23. can be suppressed, and a desired region of the irradiable region 200 by the light emitting device 100 can be partially irradiated more accurately.

In this embodiment, the configuration in which the planar view shape of the total reflection portion 23 is a substantially rectangular frame shape is exemplified. It may be ring-shaped or the like, and the same effects can be obtained in this case as well.

(First modification)
In the above-described embodiment, the moving mechanism 70 moves the light guide member 11 with respect to the light emitting unit 1 along the direction intersecting the central axis 1c of the light emitting surface 1a. It may be moved with respect to the optical member 11 .

FIG. 45 is a cross-sectional view showing an example of the configuration of a light emitting device 100a according to the first modified example. In the light emitting device 100 a , the light emitting section 1 is movable with respect to the light guide member 11 . 46 is a sectional view showing a state in which the light emitting section 1 is moved in the light emitting device 100a of FIG. 45. As shown in FIG. In addition, the same code|symbol is attached|subjected to the same structure part as embodiment mentioned above, and the overlapping description is abbreviate|omitted suitably. This point is the same for each modified example shown later.

As shown in FIGS. 45 and 46, the light emitting device 100a has a moving mechanism 70a. The moving mechanism 70a has an N-pole magnet 72a, an S-pole magnet 73a, a base portion 74aa, a spring 75a, and a coil 76aa. The N-pole magnet 72a and the S-pole magnet 73a are provided on at least one of the surface of the light emitting unit mounting board 41 and the inside thereof.

The base portion 74aa mounts the light emitting portion mounting board 41 so as to be movable within the XY plane. A wiring 42 for inputting a drive signal to the light emitting section 1 is provided on the base section 74aa. One end of the spring 75a is connected to the light-emitting portion mounting board 41, and the other end is connected to a part of the base portion 74aa. When a current flows through the coil 76aa, an electromagnetic force is generated by the action of the N pole magnet 72a, the S pole magnet 73a and the coil 76aa.

The moving mechanism 70a moves the light-emitting part mounting board 41 in a direction substantially orthogonal to the central axis 11c of the light guide member 11 by the generated electromagnetic force, thereby moving the light-emitting part 1 mounted on the light-emitting part mounting board 41. can be moved relative to the light guide member 11 . This makes it possible to provide the light emitting device 100a that can change the irradiation direction of the light and efficiently extract the light from the light emitting section 1 to the outside. Effects other than this effect are the same as those of the embodiment.

In the embodiment, as long as the light guide member 11 can be moved relative to the light emitting unit 1 along the direction intersecting the central axis 11c of the light guide member 11, the configuration for the relative movement is the same as described above. Not limited. For example, a member to which the light guide member 11 is fixed may be moved, or a member to which the light emitting section 1 is mounted or fixed may be moved.

(Second modification)
Next, FIG. 47 is a cross-sectional view showing an example of the configuration of a light emitting device 100b according to the second modified example. The light emitting device 100b has a light guide member 11b. The light guide member 11 b has a first lens 33 and a second lens 34 .

The first lens 33 has a first incidence section 12 , a second incidence section 13 , a third incidence section 14 , and a total reflection section 23 . The first lens 33 has the same function as the configuration of the side of the light guide member 11 on which the light from the light emitting section 1 is incident. The second lens 34 includes a Fresnel lens portion having a plurality of convexes on the -Z side surface. This second lens 34 is an example of a Fresnel lens.

In other words, the light guide member 11b is divided into the first lens 33 and the second lens 34, which are configured on the side of the light guide member 11 on which the light from the light emitting unit 1 is incident and which includes the Fresnel lens portion 31. It has a configuration provided by

The first lens 33 and the second lens 34 may be adhered to each other by an adhesive member or the like, or may be integrally formed. Moreover, the first lens 33 and the second lens 34 can be fixed to the housing 51 by bonding the second lens 34 to the housing 51 with the adhesive member 63 .

The relative movement between the light-emitting portion 1 and the light guide member 11b along the direction intersecting the central axis 1c of the light-emitting surface 1a may be performed by moving the light-emitting portion mounting board 41 on which the light-emitting portion 1 is mounted. Alternatively, the housing 51 to which the light guide member 11b is fixed may be moved.

With the configuration described above, it is possible to provide the light-emitting device 100b that can change the irradiation direction of the light and efficiently extract the light from the light-emitting section 1 to the outside. Effects other than this effect are the same as those of the embodiment.

(Third modification)
FIG. 48 is a cross-sectional view showing an example of the configuration of a light emitting device 100c according to the third modified example. The light emitting device 100c has a light guide member 11cc. The light guide member 11cc has a second lens 34c. The second lens 34c is a lens in which a Fresnel lens having a plurality of convexities is formed on the -Z side surface, and a convex portion 35 is formed on the +Z side surface.

As with the light guide member 11b, the light guide member 11cc has a first lens 33 on the side of the light guide member 11 on which the light from the light emitting unit 1 is incident, and a second lens 34c including the Fresnel lens portion 31. , each has a configuration provided separately. This second lens 34c is an example of a Fresnel lens. The first lens 33 and the second lens 34c may be adhered to each other by an adhesive member or the like, or may be integrally formed. Moreover, the first lens 33 and the second lens 34c can be fixed to the housing 51 by bonding the second lens 34c to the housing 51 with the adhesive member 63 .

The light emitting device 100c does not have the transparent member 54, and the projection 35 formed on the second lens 34c enters the opening 52 of the housing 51, thereby sealing the opening 52. As shown in FIG. Since the light emitting device 100c does not have the transparent member 54, the cost of the light emitting device can be reduced.

The relative movement between the light emitting portion 1 and the light guide member 11cc along the direction intersecting with the central axis 1c of the light emitting surface 1a is determined by the light emitting portion mounting substrate 41 on which the light emitting portion 1 is mounted. It may be performed by moving, or may be performed by moving the housing 51 to which the light guide member 11cc is fixed.

With the configuration described above, it is possible to provide the light-emitting device 100c that can change the irradiation direction of the light and efficiently extract the light from the light-emitting section 1 to the outside. Effects other than this effect are the same as those of the embodiment.

Each configuration described above can be modified in various ways. For example, the number of corner portions 15 in the light guide member 11 may be increased, or the curvature of the Fresnel lens portion 31 may be appropriately changed. Also, the radius of curvature of the first incident portion 12, the second incident portion 13, and the third incident portion 14, and the radius of curvature or the inclination angle of the total reflection portion 23 may be changed as appropriate.

Further, in the above-described embodiment, the light-emitting device 100 has a single set of the light-emitting portion and the light guide member, but the light-emitting device 100 has a plurality of sets of the light-emitting portion and the light guide member. A similar effect can be obtained even with a so-called compound eye configuration.

Further, in the above-described embodiments, the Fresnel lens is provided on the light emitting side of the light emitting device, but tubular light guide members are arranged in an array on the light emitting side of the light emitting device. A similar effect can be obtained even with a configuration in which the

Further, in the above-described embodiment, the configuration in which the light guide member is relatively moved with respect to the light emitting portion along the direction intersecting the central axis of the light emitting surface of the light emitting portion was exemplified. Alternatively, the same effect can be obtained by rotating the light guide member relative to the light emitting portion around the central axis of the light guide member.

Since the light-emitting device of the present invention can irradiate a desired partial irradiation area with light, it can be suitably used for lighting, camera flashes, vehicle-mounted headlights, and the like. However, the light-emitting device of the present invention is not limited to these uses.

1 light-emitting portion 1a light-emitting surface 1c central axis of light-emitting surface 2 light-emitting element 3 electrode 4 translucent member 5 covering members 11, 11a, 11b, 11cc light guide member 11c central axis of light guide member 12 first incident portion 13 second second Entrance portion 14 Third entrance portion 15 Corner portion 16 Lowermost portion 23 Total reflection portion 231 Outer edge 25 Outer edge portion 31 Fresnel lens portion 32 Concave portion 33 First lenses 34, 34c Second lens (an example of Fresnel lens)
41 Light-emitting unit mounting substrate 42 Wiring 51 Housing 52 Opening 53 Holding portion 54 Transparent members 61, 63 Adhesive member 62 Conductive adhesive member 70 Moving mechanism 71 Frame 72 N pole magnet 73 S pole magnet 74 Base 75 Spring 76 Coil 100 , 100a, 100b, 100c Light emitting device 200 Irradiable region 210 Partial irradiation region i Current h Shortest distance L Light emitted from light emitting unit Le Central axes θ1, θ2 of emitted light Angle

Claims (8)

a light-emitting portion having a light-emitting surface;
a light guide member that guides the incident light, including a total reflection portion that reflects incident light from the light emitting portion; and a Fresnel lens portion that receives the light reflected by the total reflection portion;
and a moving mechanism for relatively moving the light guide member with respect to the light emitting section along a direction intersecting the central axis of the light emitting surface. 2. The light emitting device according to claim 1, wherein the light guide member has a Fresnel lens on the side from which the light guided by the light guide member is emitted. 3. The light emitting device according to claim 1, wherein the moving mechanism relatively moves the light guide member with respect to the light emitting section while the light emitting section is emitting light. The total reflection portion is provided in a frame shape or a ring shape in plan view,
4. The moving mechanism according to any one of claims 1 to 3, wherein the moving mechanism relatively moves the light guide member with respect to the light emitting section such that the light emitting surface of the light emitting section is inside the total reflection section in plan view. 11. The light-emitting device according to Item 1. The total reflection portion is provided in a frame shape or a ring shape in plan view,
The light emitting device according to any one of claims 1 to 4, wherein the light guide member has a curved surface that converges the incident light inside the total reflection portion provided in the frame shape. 6. The light emitting device according to claim 5, wherein said curved surface has a plurality of curved surfaces with different curvature radii. The total reflection portion is provided in a frame shape or a ring shape in plan view,
7. The light-emitting device according to claim 1, wherein the area of the region inside the outer edge of the total reflection portion is larger than the light-emitting surface of the light-emitting portion. The shortest distance along the direction perpendicular to the light emitting surface between the light emitting surface of the light emitting unit and the light guide member is 0.0 mm or more and 1.0 mm or less. Item 8. The light-emitting device according to any one of Items 1 to 7.

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