Lighting device

Abstract

To provide a lighting device that can readily design a drawing pattern with a small configuration.SOLUTION: A lighting device includes: a light source; a Fresnel plane disposed on an emission side of the light source; a linear prism plane disposed on an emission side of the Fresnel plane; and a lenticular plane disposed while being inclined on an emission side of the linear prism plane.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lighting device. [Background technology]

[0002] Various lighting devices for drawing images that emit light to form a drawing pattern on a projection surface have been studied. For example, a lighting device for drawing images can be mounted on a vehicle and a drawing pattern that indicates the vehicle's direction of travel can be projected onto the road surface to alert nearby pedestrians and others. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2022 / 168542 Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the present invention is to provide an illumination device that has a small configuration and allows easy design of a drawing pattern. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems and achieve the object, an illumination device according to one aspect of the present invention includes a light source, a Fresnel surface arranged on the output side of the light source, a linear prism surface arranged on the output side of the Fresnel surface, and a lenticular surface arranged at an angle to the output side of the linear prism surface. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing the appearance of a lighting device 1 according to an embodiment. [Figure 2] FIG. 2 is a diagram showing an example of the internal configuration of the lighting device 1. As shown in FIG. [Figure 3]FIG. 3 is an enlarged view (cross-sectional view) showing an example of the configuration of the linear prism surface 4b. [Figure 4] FIG. 4 is an enlarged view (perspective view) showing an example of the configuration of the lenticular surface 5a. [Figure 5] FIG. 5 is a diagram showing an example of a light beam image in the lighting device 1. As shown in FIG. [Figure 6] FIG. 6 is a diagram showing an example of a light beam image in the lighting device 1. As shown in FIG. [Figure 7] FIG. 7 is a diagram for explaining the tilt direction φ and tilt angle θ of the optical axis caused by the linear prism surface 4b. [Figure 8] FIG. 8 is a diagram showing an example of the internal configuration of the lighting device 1′ and an example of a light beam image. [Figure 9] FIG. 9 is an enlarged view (cross-sectional view) showing an example of the configuration of the linear prism surface 4b'. [Figure 10A] FIG. 10A is a diagram showing an example of controlling the drawing position by the base angle of the linear prism element. [Figure 10B] FIG. 10B is a diagram showing an example of controlling the drawing position by the base angle of the linear prism element. [Figure 11A] FIG. 11A is a diagram showing an example of controlling the imaging position based on the extending direction of the linear prism element. [Figure 11B] FIG. 11B is a diagram showing an example of controlling the drawing position depending on the extending direction of the linear prism element. [Figure 11C] FIG. 11C is a diagram showing an example of controlling the imaging position based on the extending direction of the linear prism element. [Figure 12A] FIG. 12A is a diagram showing an example of controlling the length of a drawing pattern using the contact angle of a lenticular element. [Figure 12B] FIG. 12B is a diagram showing an example of controlling the length of a drawing pattern using the contact angle of a lenticular element. [Figure 12C] FIG. 12C is a diagram showing an example of controlling the length of a drawing pattern using the contact angle of a lenticular element. [Figure 13A] FIG. 13A is a diagram showing an example of controlling the angle of a drawing pattern depending on the extending direction of lenticular elements. [Figure 13B] FIG. 13B is a diagram showing an example of controlling the angle of a drawing pattern depending on the extending direction of the lenticular elements. [Figure 13C] FIG. 13C is a diagram showing an example of controlling the angle of a drawing pattern depending on the extending direction of lenticular elements. [Figure 14A] FIG. 14A is a diagram showing an example of a drawing pattern when a plurality of lighting devices 1 are combined. [Figure 14B] FIG. 14B is a diagram showing an example of a drawing pattern when a plurality of lighting devices 1 are combined. [Figure 15A] FIG. 15A is a diagram showing an example of a drawing pattern when a plurality of lighting devices 1 are combined. [Figure 15B] FIG. 15B is a diagram showing an example of a drawing pattern when a plurality of lighting devices 1 are combined. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, lighting devices according to embodiments will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. Furthermore, the dimensional relationships and ratios of elements in the drawings may differ from reality. The dimensional relationships and ratios may differ between the drawings. Furthermore, the content described in one embodiment or modification is, in principle, applicable to other embodiments or modifications in the same manner.

[0008] (Embodiment) (composition) Fig. 1 is an external perspective view of a lighting device 1 according to an embodiment. In Fig. 1, the internal configuration of the lighting device 1 is indicated by dashed lines. In the illustrated example, the lighting device 1 has a lamp size of 20 mm x 20 mm x 13 mm.

[0009] In this embodiment, the lighting device 1 is a lighting fixture (line lighting device) for drawing a line-shaped light drawing pattern on a projection surface by emitting light. The lighting device 1 is typically mounted on a vehicle, but is not limited thereto and can be mounted in any location, such as the interior or exterior wall of a building or a street lamp.

[0010] As shown in FIG. 1, the lighting device 1 includes a housing 2, an LED (Light Emitting Diode) 3, and lenses 4 and 5. The housing 2 has a cylindrical recess that opens downward, and the LED 3, lens 4, and lens 5 are provided inside the recess of the housing 2. The wall surface (inner wall) of the recess of the housing 2 is black to reduce reflection from the wall surface. For ease of explanation, the axial direction (central axis) of the cylindrical recess of the housing 2 will be referred to as the Y-axis direction, the direction perpendicular to the Y-axis direction as the X-axis direction, and the direction perpendicular to the X-axis and Y-axis directions as the Z-axis direction.

[0011] 1 is merely an example, and the present invention is not limited thereto. For example, although the case 2 is configured in a cubic shape in the example of FIG. 1, it may be configured in any shape, such as a cylindrical shape or a polygonal prism shape. Furthermore, the size of the lamp of the lighting device 1 can also be changed as appropriate.

[0012] FIG. 2 is a diagram showing an example of the internal configuration of the lighting device 1. FIG. 2 shows a cross-sectional view in the YZ plane passing through the LED 3. As shown in FIG. 2, the LED 3 is disposed as a single light in the center of the bottom surface of the recess (hole) in the housing 2. For example, the LED 3 is a light source including three types (RGB) of LED chips, and is disposed on an LED substrate (not shown).

[0013] The lens 4 is disposed on the emission side of the LED 3 and is a plate-like member made of, for example, PMMA (polymethyl methacrylate). The lens 4 has a TIR (Total Internal Reflection) Fresnel surface 4a on the incident surface side and a linear prism surface 4b on the emission surface side.

[0014] The TIR Fresnel surface 4a has multiple prisms with triangular cross sections that are concentrically arranged around the position of the LED 3, with refractive prisms formed in the inner region and reflective prisms formed in the outer region. As a result, the TIR Fresnel surface 4a outputs the light from the LED 3 as parallel light.

[0015] The linear prism surface 4b is disposed on the exit side of the TIR Fresnel surface 4a and is disposed parallel to the TIR Fresnel surface 4a. As shown in FIG. 3, the linear prism surface 4b has a plurality of linear prism elements (triangular prisms) with a triangular cross section extending in the X-axis direction. For example, the linear prism elements have a base angle of 88 degrees on the positive Z-axis side and a base angle of 30 degrees on the negative Z-axis side. FIG. 3 is an enlarged view (cross-sectional view) showing an example configuration of the linear prism surface 4b.

[0016] Lens 5 is disposed on the exit side of lens 4 and is a plate-like member made of, for example, PMMA. Lens 5 has a lenticular surface 5a on the entrance side. The exit surface of lens 5 is disposed parallel to lenticular surface 5a, and it is preferable that no optical element is provided on the exit surface side of lens 5.

[0017] The lenticular surface 5a is disposed at an incline toward the output side of the linear prism surface 4b. Specifically, the lenticular surface 5a is disposed at an incline with respect to the TIR Fresnel surface 4a. As shown in Fig. 4, the lenticular surface 5a has a plurality of semi-cylindrical lenticular elements extending in the Z-axis direction. Note that Fig. 4 is an enlarged view (perspective view) showing an example of the configuration of the lenticular surface 5a.

[0018] 2, lenticular surface 5a (and the exit surface of lens 5) is tilted so as to be perpendicular to the optical axis of the light exiting from linear prism surface 4b. If these are not positioned perpendicularly, the refraction angle will vary depending on the incident position on lenticular surface 5a, causing distortion in the line-shaped light drawn on the projection surface.

[0019] Furthermore, the lenticular surface 5a (and the exit surface of the lens 5) is divided into four pieces and arranged in a stepped pattern. Specifically, the lens 5 is arranged in a stepped pattern by dividing the lens 5 into four pieces and arranging each lens at an angle along a plane (XY plane) that passes through the extension direction of the linear prism element (X-axis direction) and the exit direction of light from the TIR Fresnel surface 4a (Y-axis direction). As a result, the thickness of the lens 5 is reduced, which contributes to the miniaturization of the lighting device 1.

[0020] 2, 3, and 4 are merely examples, and the present invention is not limited to these. For example, in Fig. 2, the TIR Fresnel surface 4a and the linear prism surface 4b are formed on a common lens 4, but they may be formed on separate lenses.

[0021] Furthermore, in the above example, a case has been described in which a refractive prism is formed on the inner circumferential side and a reflective prism is formed on the outer circumferential side (TIR Fresnel surface 4a), but for example, a case in which a refractive prism is formed on either the inner circumferential side or the outer circumferential side (Fresnel surface) may also be applied.

[0022] In the above example, the lenticular surface 5a is arranged in a four-step staircase pattern, but the number of steps can be set as desired. Note that although it is possible to have only one step (i.e., a flat surface rather than a staircase pattern), from the perspective of miniaturizing the lighting device 1, it is preferable to arrange the lenticular surface 5a in a staircase pattern of several steps.

[0023] In the above example, the linear prism elements extend in the X-axis direction, but the present invention is not limited to this. The linear prism elements may extend in any direction inclined from the X-axis direction. Control of the drawing pattern using this inclination will be described later.

[0024] Furthermore, the lenses 4 and 5 are not limited to PMMA, and can be made of any material such as polycarbonate, PET (polyethylene terephthalate), silicone, etc.

[0025] (ray image) 5 and 6 are diagrams showing examples of light ray images in the lighting device 1. Fig. 5 shows a cross-sectional view in the YZ plane passing through the LED 3. Fig. 6 shows a cross-sectional view in the XY plane passing through the LED 3.

[0026] As shown in Figures 5 and 6, the light beams emitted from the LED 3 are collimated by the TIR Fresnel surface 4a into parallel beams traveling in the negative direction of the Y-axis. The light beams emitted from the TIR Fresnel surface 4a are tilted by θ degrees toward the positive direction of the Z-axis by the linear prism surface 4b. The light beams emitted from the linear prism surface 4b are incident perpendicularly on the lenticular surface 5a, and the light distribution is expanded in the X-axis direction while maintaining the optical axis. As a result, the light beams emitted from the lenticular surface 5a can project a line of light extending in the X-axis direction on the projection surface.

[0027] (Control of the position of the drawing pattern) The position of the drawing pattern (line-shaped light) on the projection surface is controlled by the tilt direction and tilt angle of the optical axis caused by linear prism surface 4b. The position of the drawing pattern is determined by the position of the optical axis.

[0028] FIG. 7 is a diagram illustrating the tilt direction φ and tilt angle θ of the optical axis caused by the linear prism surface 4b. In FIG. 7, a light ray emitted from the TIR Fresnel surface 4a travels, for example, along the negative Y-axis direction, is tilted by the linear prism surface 4b, and is emitted as the optical axis 3a. The tilt angle of this optical axis 3a is the angle θ degrees between the optical axis 3a and the Y-axis. The tilt direction of the optical axis 3a is defined in the XZ plane. That is, the tilt direction of the optical axis 3a is the angle φ degrees between the optical axis 3b, which is the projection of the optical axis 3a onto the XZ plane, and the Z-axis direction. That is, the linear prism surface 4b tilts the optical axis of the light (parallel light) emitted from the TIR Fresnel surface 4a in a predetermined direction (φ) by a predetermined angle (θ).

[0029] The tilt direction φ and tilt angle θ can be controlled by the configuration of the linear prism surface 4b. First, we will explain how to control the tilt angle θ using the base angle of the linear prism element. Note that, except for the points described below, the configuration of the illumination device 1' is basically the same as the configuration of the illumination device 1 described above.

[0030] FIG. 8 is a diagram showing an example of the internal configuration of lighting device 1′ and an example of a light ray image. FIG. 9 is an enlarged view (cross-sectional view) showing an example of the configuration of linear prism surface 4b′. As shown in FIGS. 8 and 9, in lighting device 1′, the base angle on the negative Z-axis direction side of the linear prism elements formed on linear prism surface 4b′ is 10 degrees. As a result, the inclination angle θ′ of the light ray emitted from linear prism surface 4b′ is smaller (shallower) than the inclination angle θ in FIG. 5.

[0031] In addition, in the illumination device 1', the lens 5' (lenticular surface 5a) is disposed at an angle perpendicular to the optical axis of the light emitted from the linear prism surface 4b'. This angle is smaller (shallower) than the angle of the lens 5 in FIG.

[0032] 10A and 10B are diagrams illustrating an example of controlling the drawing position based on the base angle of the linear prism element. FIGS. 10A and 10B illustrate illuminance distributions on a projection surface located 500 mm below the lighting fixture. Specifically, FIG. 10A shows the illuminance distribution when the base angle of the linear prism element is 30 degrees, and FIG. 10B shows the illuminance distribution when the base angle of the linear prism element is 10 degrees. In the illuminance distribution, the center corresponds to the lighting fixture position, and the center of the linear light drawing pattern corresponds to the optical axis position of the light emitted from the lighting fixture. The x-axis direction (horizontal direction) in the illuminance distribution corresponds to the z-axis direction of the lighting device 1 (lighting device 1′), and the y-axis direction (vertical direction) in the illuminance distribution corresponds to the x-axis direction of the lighting device 1 (lighting device 1′).

[0033] As shown in Figure 10A, when the base angle of the linear prism element is 30 degrees, a line of light is drawn at a position approximately 170 mm away. In contrast, as shown in Figure 10B, when the base angle of the linear prism element is 10 degrees, a line of light is drawn at a position approximately 40 mm away. From these results, it can be said that the larger the base angle of the linear prism element, the larger the tilt angle θ, and the farther the position of the drawn pattern is from the lamp position. In other words, the tilt angle θ is set according to the position of the drawn pattern (distance from the lamp position), and linear prism surface 4b has linear prism elements with base angles set according to the tilt angle θ.

[0034] Next, we will explain how the tilt direction φ is controlled by the extension direction (scribing direction) of the linear prism element. The extension direction of the linear prism element and the tilt direction φ are shifted by 90 degrees from each other. In other words, when the extension direction of the linear prism element is parallel to the X-axis direction, the tilt direction φ of the optical axis tilted by linear prism surface 4b is 0 degrees. Furthermore, when the extension direction of the linear prism element is rotated 30 degrees from a position parallel to the X-axis direction, the tilt direction φ is 30 degrees. Furthermore, when the extension direction of the linear prism element is rotated 60 degrees from a position parallel to the X-axis direction, the tilt direction φ is 60 degrees.

[0035] 11A, 11B, and 11C are diagrams illustrating an example of controlling the drawing position based on the extension direction of the linear prism element. FIGS. 11A, 11B, and 11C illustrate illuminance distributions on a projection surface located directly below the lighting fixture at a distance of 500 mm. Specifically, FIG. 11A shows the illuminance distribution when the tilt direction φ is 0 degrees, FIG. 11B shows the illuminance distribution when the tilt direction φ is 30 degrees, and FIG. 11C shows the illuminance distribution when the tilt direction φ is 60 degrees. In the illuminance distribution, the center corresponds to the lighting fixture position, and the center of the linear light drawing pattern corresponds to the optical axis of the light emitted from the lighting fixture. The x-axis direction (horizontal direction) in the illuminance distribution corresponds to the Z-axis direction of the lighting device 1, and the y-axis direction (vertical direction) in the illuminance distribution corresponds to the X-axis direction of the lighting device 1.

[0036] As shown in FIG. 11A, when the tilt direction φ is 0 degrees, the optical axis is drawn at a position approximately 170 mm away in the x-axis direction of the illuminance distribution. Also, as shown in FIG. 11B, when the tilt direction φ is 30 degrees, the optical axis is drawn at a position rotated 30 degrees from the optical axis position shown in FIG. 11A. Also, as shown in FIG. 11C, when the tilt direction φ is 60 degrees, the optical axis is drawn at a position rotated 60 degrees from the optical axis position shown in FIG. 11A. From these results, it can be said that the more the extension direction of the linear prism element is rotated (tilted), the larger the tilt direction φ becomes, and the position of the drawn pattern rotates according to the tilt angle θ. In other words, the tilt direction φ is set according to the position of the drawn pattern (the angle from the lamp position), and the linear prism surface 4b has linear prism elements whose extension direction is set according to the tilt direction φ.

[0037] (Controlling the length of the drawing pattern) The length of the light drawing pattern on the projection surface is controlled by the height or contact angle of the lenticular elements formed on the lenticular surface 5a.

[0038] 12A, 12B, and 12C are diagrams illustrating an example of controlling the length of a drawing pattern using the contact angle of a lenticular element. FIGS. 12A, 12B, and 12C illustrate illuminance distributions on a projection surface located 500 mm below the lighting fixture. Specifically, FIG. 12A shows the illuminance distribution when the contact angle is 28.1 degrees, FIG. 12B shows the illuminance distribution when the contact angle is 17.1 degrees, and FIG. 12C shows the illuminance distribution when the contact angle is 5.7 degrees. In the illuminance distribution, the center corresponds to the lighting fixture position, and the center of the linear light drawing pattern corresponds to the optical axis position of the light emitted from the lighting fixture. The x-axis direction (horizontal direction) in the illuminance distribution corresponds to the Z-axis direction of the lighting device 1, and the y-axis direction (vertical direction) in the illuminance distribution corresponds to the X-axis direction of the lighting device 1. The above contact angles were calculated using the θ / 2 method.

[0039] As shown in FIG. 12A, when the contact angle was 28.1 degrees, the length of the drawn pattern was approximately 450 mm. Also, as shown in FIG. 12B, when the contact angle was 17.1 degrees, the length of the drawn pattern was approximately 320 mm. Also, as shown in FIG. 12C, when the contact angle was 5.7 degrees, the length of the drawn pattern was approximately 190 mm. From these results, it can be said that the larger the contact angle of the lenticular element, the longer the length of the line-shaped drawn pattern. In other words, the lenticular surface 5a has lenticular elements with a contact angle corresponding to the length of the line-shaped projection light drawn on the projection surface.

[0040] 12A to 12C, the control of the length of the drawing pattern by the contact angle of the lenticular elements has been described, but since the contact angle of the lenticular elements increases as the height of the lenticular elements increases (assuming the radius of curvature is constant), the height of the lenticular elements can also be controlled in a similar manner. That is, the lenticular surface 5a has lenticular elements having a height or contact angle that corresponds to the length of the linear projection light drawn on the projection surface.

[0041] (Controlling the angle of the drawing pattern) The angle (direction) of the light drawing pattern on the projection surface is controlled by the extension direction (notch direction) of the lenticular elements formed on the lenticular surface 5a.

[0042] 13A, 13B, and 13C are diagrams illustrating an example of controlling the angle of the drawing pattern depending on the extension direction of the lenticular elements. FIGS. 13A, 13B, and 13C illustrate illuminance distributions on a projection surface located 500 mm below the lighting fixture. Specifically, FIG. 13A shows the illuminance distribution when the extension direction is parallel to the Z-axis direction, FIG. 13B shows the illuminance distribution when the extension direction is rotated 30 degrees from a position parallel to the Z-axis direction, and FIG. 13C shows the illuminance distribution when the extension direction is rotated 60 degrees from a position parallel to the Z-axis direction. Note that the center of the illuminance distribution corresponds to the position of the lighting fixture, and the center of the linear light drawing pattern corresponds to the position of the optical axis of the light emitted from the lighting fixture. The x-axis direction (horizontal direction) of the illuminance distribution corresponds to the Z-axis direction of the lighting device 1, and the y-axis direction (vertical direction) of the illuminance distribution corresponds to the X-axis direction of the lighting device 1.

[0043] As shown in FIG. 13A, when the extension direction is parallel to the Z-axis direction, the direction of the drawing pattern is parallel to the y-axis direction of the illuminance distribution. Furthermore, as shown in FIG. 13B, when the extension direction is rotated 30 degrees from a position parallel to the Z-axis direction, the direction of the drawing pattern is rotated 30 degrees from the direction of the drawing pattern in FIG. 13A. Furthermore, as shown in FIG. 13C, when the extension direction is rotated 30 degrees from a position parallel to the Z-axis direction, the direction of the drawing pattern is rotated 30 degrees from the direction of the drawing pattern in FIG. 13A. From these results, the angle of the linear drawing pattern is controlled according to the extension direction of the lenticular elements. In other words, the lenticular surface 5a has lenticular elements whose extension direction corresponds to the angle of the linear projection light drawn on the projection surface.

[0044] (Controlling the thickness of the drawing pattern) The thickness of the light drawing pattern on the projection surface is controlled by the distance between the LED 3 and the lens 4.

[0045] In this embodiment, the light beams emitted from the linear prism surface 4b are expanded in only one axial direction (X-axis direction) by the lenticular surface 5a, and collimated in the other axial direction (Z-axis direction) reach the projection surface as they are. In other words, the thickness of the collimated light beams corresponds to the thickness of the light pattern drawn on the projection surface. For this reason, the TIR Fresnel surface 4a is positioned at a distance from the LED 3 according to the thickness of the line-shaped projection light drawn on the projection surface. However, increasing the distance between the LED 3 and the lens 4 may increase the size (thickness) of the lighting device 1. For this reason, it is preferable to set the distance between the LED 3 and the lens 4 to thicken the drawing pattern within the range allowed for the size of the lighting device 1.

[0046] The thickness of the light drawing pattern on the projection surface can be controlled not only by the distance between the LED 3 and the lens 4, but also by changing the material of the lens 5 to one with diffusibility (such as a material containing particles) or by providing a diffusive surface (diffusive film) on the exit side of the lens 5. That is, the lenticular surface 5a is preferably formed on the lens 5 with diffusibility corresponding to the thickness of the line-shaped projection light drawn on the projection surface. Furthermore, the illumination device 1 is preferably further provided with a film that is disposed on the exit side of the lenticular surface 5a and has diffusibility corresponding to the thickness of the line-shaped projection light drawn on the projection surface. With these configurations, the drawing pattern can be made thicker without increasing the size (thickness) of the illumination device 1.

[0047] As described above, the lighting device according to the embodiment includes a single LED, a Fresnel surface disposed on the light-emitting side of the LED, a linear prism surface disposed on the light-emitting side of the Fresnel surface, and a lenticular surface disposed at an angle to the light-emitting side of the linear prism surface. This allows the lighting device 1 to easily design a drawing pattern with a compact configuration. For example, the lighting device 1 allows the light distribution design, such as the position, length, angle, and width of the drawing pattern, to be easily designed.

[0048] Furthermore, by using a plurality of lighting devices 1 according to this embodiment, it is possible to combine a plurality of line-shaped light drawing patterns. For example, examples of drawing patterns formed by combining five lighting devices 1 are shown in FIGS. 14A, 14B, 15A, and 15B. FIGS. 14A, 14B, 15A, and 15B are diagrams showing examples of drawing patterns formed when a plurality of lighting devices 1 are combined. The individual combined line-shaped lights can also be controlled like sequential lighting by individually turning on and off the corresponding lighting devices 1.

[0049] The linear prism surface is arranged parallel to the Fresnel surface, and the lenticular surface is arranged at an angle to the Fresnel surface. This allows the illumination device 1 to project a line of light onto the projection surface.

[0050] The lenticular surface is arranged perpendicular to the optical axis of the light emitted from the linear prism surface, allowing the illumination device 1 to project a linear light beam that is expanded in only one axial direction onto the projection surface.

[0051] Furthermore, the lenticular surface is divided into a predetermined number of parts and arranged in a stepped pattern, which allows the lighting device 1 to be made smaller in size in the thickness direction.

[0052] The linear prism surface tilts the optical axis of the light emitted from the Fresnel surface at a predetermined angle in a predetermined direction, allowing the lighting device 1 to form a light drawing pattern at a desired position on the projection surface.

[0053] The linear prism surface has linear prism elements with base angles set according to a predetermined angle, which allows the lighting device 1 to easily form a light drawing pattern at a desired position on the projection surface.

[0054] The linear prism surface has linear prism elements whose extension direction is set according to a predetermined direction, which allows the lighting device 1 to easily form a light drawing pattern at a desired position on the projection surface.

[0055] The lenticular surface has lenticular elements with a height or contact angle that corresponds to the length of the line-shaped projection light drawn on the projection surface. This makes it easy to design the length of the drawing pattern in the illumination device 1.

[0056] The lenticular surface has lenticular elements whose extension direction corresponds to the angle of the linear projection light drawn on the projection surface. This makes it easy to design the angle of the drawing pattern in the illumination device 1.

[0057] Furthermore, the lenticular surface is formed into a lens having a diffusivity according to the thickness of the line-shaped projection light drawn on the projection surface. This allows the illumination device 1 to easily design the thickness of the drawing pattern.

[0058] The Fresnel surface is a TIR Fresnel surface that outputs the light from the LED as parallel light.

[0059] The Fresnel surface is positioned away from the LEDs in accordance with the thickness of the line-shaped projection light drawn on the projection surface. This allows the lighting device 1 to easily design the thickness of the drawing pattern.

[0060] The illumination device 1 further includes a film disposed on the exit side of the lenticular surface, which has a diffusivity according to the thickness of the line-shaped projection light drawn on the projection surface. This allows the illumination device 1 to easily design the thickness of the drawing pattern.

[0061] The illumination device 1 also includes a first lens having a Fresnel surface formed on a first surface and a linear prism surface formed on a second surface opposite the first surface, and a second lens having a lenticular surface formed on a second surface, which allows the illumination device 1 to be implemented in a compact configuration.

[0062] Furthermore, the lighting device 1 forms a drawing pattern of light on the projection surface.

[0063] Furthermore, the present invention is not limited to the above-described embodiments. Configurations in which the above-described components are appropriately combined are also included in the present invention. Furthermore, further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible. [Explanation of symbols]

[0064] 1 lighting device, 2 housing, 3 LED, 4, 5 lens, 4a TIR Fresnel surface, 4b linear prism surface, 5a lenticular surface

Claims

1. A light source and a Fresnel surface disposed on the output side of the light source; a linear prism surface disposed on the exit side of the Fresnel surface; a lenticular surface disposed at an incline on the exit side of the linear prism surface; A lighting device comprising:

2. the linear prism surface is arranged parallel to the Fresnel surface; The lenticular surface is disposed at an angle with respect to the Fresnel surface. The lighting device according to claim 1 .

3. The lenticular surface is disposed perpendicular to the optical axis of the light emitted from the linear prism surface. The lighting device according to claim 1 .

4. The lenticular surface is divided into a predetermined number of parts and arranged in a stepped pattern. The lighting device according to claim 1 .

5. the linear prism surface tilts the optical axis of the light emitted from the Fresnel surface by a predetermined angle in a predetermined direction; The lighting device according to claim 1 .

6. The linear prism surface has linear prism elements having base angles set according to the predetermined angle.

6. The lighting device according to claim 5.

7. The linear prism surface has linear prism elements having an extension direction set in accordance with the predetermined direction.

6. The lighting device according to claim 5.

8. the lenticular surface has lenticular elements having a height or a contact angle corresponding to the length of the linear projection light imaged on the projection surface; The lighting device according to claim 1 .

9. the lenticular surface has lenticular elements having an extension direction corresponding to the angle of the linear projection light drawn on the projection surface; The lighting device according to claim 1 .

10. The lenticular surface is formed into a lens having a diffusivity according to the width of the line-shaped projection light drawn on the projection surface. The lighting device according to claim 1 .

11. The Fresnel surface is a TIR (Total Internal Reflection) Fresnel surface that emits light from the light source as parallel light. The lighting device according to claim 1 .

12. the Fresnel surface is disposed at a position away from the light source in accordance with the width of the line-shaped projection light to be rendered on the projection surface; The lighting device according to claim 1 .

13. The projection lens further includes a film disposed on the exit side of the lenticular surface and having a diffusivity according to the width of the line-shaped projection light drawn on the projection surface. The lighting device according to claim 1 .

14. a first lens having the Fresnel surface formed on a first surface and the linear prism surface formed on a second surface opposite to the first surface; a second lens on which the lenticular surface is formed, The lighting device according to claim 1 .

15. The light source is a single LED (Light Emitting Diode). The lighting device according to claim 1 .

16. Forming a light drawing pattern on the projection surface, The lighting device according to claim 1 .

Images