Lighting fixtures

Abstract

The objective of this disclosure is to reduce the possibility of distortion occurring in the irradiation pattern. [Solution] The lighting fixture 1 comprises a light source 10, a first optical element 31, and a second optical element 32. Each of the first optical element 31 and the second optical element 32 has a plurality of prism portions 300 and a base portion 303. Each of the plurality of adjacent prism portions 300 protrudes from the base portion 303 of the corresponding optical element among the first optical element 31 and the second optical element 32 in the same direction along the optical axis. The base portion 303 of the first optical element 31 includes a light diffusion portion 312 that diffuses light to broaden the light irradiation range to the light-illuminating object 2. The light diffusion portion 312 is formed in the thickness direction of the first optical element 31 on the side opposite to the portion where the plurality of prism portions 300 are provided.

Description

Technical Field

[0001] The present disclosure generally relates to lighting fixtures, and more particularly to lighting fixtures provided with light sources.

Background Art

[0002] Patent Document 1 provides a lighting fixture capable of varying the light distribution without increasing the size of the fixture body.

[0003] The lighting fixture of Patent Document 1 includes a flat plate-shaped surface light source having a light emitting surface that emits light, and flat plate-shaped first and second prism panels each provided below the surface light source and having a light emitting surface that changes the irradiation direction of the light irradiated from the surface light source, a substantially circular first support frame and a second support frame that support so as to cover the entire circumferences of the first prism panel and the second prism panel, and a bottomed cylindrical shape with an open lower surface, and is composed of a fixture body that houses the surface light source, the first prism panel, the second prism panel, the first support frame, and the second support frame, and each prism panel can be rotated independently of each other by manually rotating each support frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the indoor lighting system of Patent Document 1, when two prism panels act on each other to distribute light, there is a possibility that distortion may occur in the irradiation pattern.

[0006] In view of the above problems, the present disclosure aims to provide a lighting fixture capable of reducing the possibility of distortion occurring in the irradiation pattern. [Means for solving the problem]

[0007] A lighting fixture according to one aspect of the present disclosure comprises a light source, a first optical element, and a second optical element. The first optical element and the second optical element are arranged side by side along the optical axis of the light source and have the function of bending the light emitted from the light source in a predetermined direction. Each of the first optical element and the second optical element has a plurality of prism portions and a base portion. Each of the plurality of adjacent prism portions protrudes from the base portion of the corresponding optical element among the first optical element and the second optical element in the same direction along the optical axis. The base portion of the first optical element includes a light diffusing portion that diffuses the light, thereby expanding the illumination range of the light on the object to be illuminated by the light. The light diffusing portion is formed in the thickness direction of the first optical element on the side opposite to the portion where the plurality of prism portions are provided. [Effects of the Invention]

[0008] According to this disclosure, the possibility of distortion occurring in the irradiation pattern can be reduced. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view of the lighting fixture according to this embodiment. [Figure 2] Figure 2 is an exploded perspective view of the lighting device included in the same lighting fixture. [Figure 3] Figure 3 is a cross-sectional view of the same lighting fixture. [Figure 4] Figure 4 is a cross-sectional view showing a portion of the first optical element of the lighting fixture described above. [Figure 5] Figure 5 is a block diagram showing the configuration of the lighting fixture mentioned above. [Figure 6] Figure 6 is a side view of the first optical element, the second optical element, and the first rotary operating section of the same lighting fixture. [Figure 7]Figure 7 is a schematic diagram illustrating the principle of refraction between the first and second optical elements of the same lighting fixture. [Figure 8] Figure 8 is another schematic diagram illustrating the principle of refraction between the first and second optical elements of the same lighting fixture. [Figure 9] Figure 9 is a perspective view showing the effect of the light-diffusing portion of the first optical element in the same lighting fixture. [Figure 10] Figure 10 is a cross-sectional view showing an example of the arrangement of optical elements in the lighting fixture of Modification 1. [Figure 11] Figure 11 is another cross-sectional view showing an example of the arrangement of optical elements in the lighting fixture of Modification 1. [Figure 12] Figure 12 is a cross-sectional view showing an example of the arrangement of optical elements in the lighting fixture of Modified Example 2. [Figure 13] Figure 13 is a perspective view showing some of the optical elements included in the lighting fixture of Modification 3. [Figure 14] Figure 14 is a perspective view showing some of the optical elements included in the lighting fixture of Modification 4. [Figure 15] Figure 15 is another perspective view showing some of the optical elements included in the lighting fixture of Modification 4. [Modes for carrying out the invention]

[0010] The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to these embodiments and modifications. Various modifications are possible depending on the design, etc., as long as they do not depart from the technical concept of the present disclosure.

[0011] Each figure described in the present disclosure is a schematic diagram, and the respective ratios of the sizes and thicknesses of each component in each figure do not necessarily reflect the actual dimensional ratios. Note that the arrows indicating each direction in the drawings are for example only and are not intended to define the direction during the use of the lighting fixture 1. Also, the arrows indicating each direction in the drawings are merely for notation for explanation purposes and do not accompany the actual state. More specifically, for example, in FIG. 1, when the lighting fixture 1 is installed on the ceiling, the direction extending from the ground to the ceiling is defined as the vertical direction.

[0012] (Embodiment) Hereinafter, the lighting fixture 1 according to the present embodiment will be described with reference to FIGS. 1 to 9.

[0013] (1) Outline As shown in FIG. 2, the lighting fixture 1 according to the present embodiment includes a light source 10, a first optical element 31, and a second optical element 32. The first optical element 31 and the second optical element 32 are arranged side by side along the optical axis direction (vertical direction) of the light source 10 and have the function of bending the light emitted from the light source 10 in a predetermined direction. Each of the first optical element 31 and the second optical element 32 has a plurality of prism portions 300 and a base portion 303. Each of the plurality of prism portions 300 adjacent to each other projects from the base portion 303 of the corresponding optical element among the first optical element 31 and the second optical element 32 in the same direction along the optical axis direction. The base portion 303 of the first optical element 31 includes a light diffusion portion 312 that expands the light irradiation range with respect to the light irradiation target 2 by diffusing the light. The light diffusion portion 312 is formed at a portion opposite to the portion where the plurality of prism portions 300 are provided in the thickness direction of the first optical element 31.

[0014] According to this configuration, by forming the light diffusion portion 312 in the base portion 303 of the first optical element 31, the light that causes distortion in the irradiation pattern can be diffused, and the irradiation pattern can be adjusted. That is, the possibility of distortion occurring in the irradiation pattern can be reduced.

[0015] (2) Configuration As shown in Figure 1, the lighting fixture 1 according to this embodiment comprises a lighting device 80 and a cover body 50a serving as a position operating unit 50. The lighting fixture 1 is, for example, a universal downlight.

[0016] (2.1) Lighting devices As shown in Figure 5, the lighting device 80 includes a light source 10, a first optical element 31, and a second optical element 32. Furthermore, the lighting device 80 includes a condensing lens 20 and an operating unit 40.

[0017] The lighting device 80 is a device that integrates a mechanism for changing the direction of light irradiation in the lighting fixture 1.

[0018] (2.1.1) Light source The light source 10 emits light. More specifically, the light source 10 converts power supplied from an external power source into light and emits it. The light source 10 has, for example, multiple light-emitting elements. Each of the multiple light-emitting elements is, for example, an LED (Light Emitting Diode). The color (color temperature) of the light emitted from the multiple light-emitting elements may be the same or different. The light source 10 may also have light-emitting elements other than LEDs, such as organic EL (Electro Luminescence) elements or laser diodes.

[0019] (2.1.2) Focusing lens The condensing lens 20 is made of, for example, a light-transmitting material, such as acrylic, silicone resin material, or transparent resin material such as polycarbonate, or glass material. In this embodiment, as shown in Figure 2, the condensing lens 20 is positioned between the light source 10 and the second optical element 32 in the optical axis direction (vertical direction) of the light source 10. The condensing lens 20 is a lens that collects the light emitted from the light source 10. When light emitted from the light source 10 is incident on the condensing lens 20, it emits the light toward the second optical element 32.

[0020] (2.1.3) Optical elements (first optical element and second optical element) The first optical element 31 and the second optical element 32 are made of, for example, a light-transmitting material, such as acrylic, silicone resin material, or transparent resin material such as polycarbonate, or glass material. As shown in Figure 3, the first optical element 31 and the second optical element 32 are arranged side by side along the optical axis direction (vertical direction) of the light source 10. The second optical element 32 is also positioned between the light source 10 and the first optical element 31. In this embodiment, the first optical element 31 and the second optical element 32 have the function of refracting the light emitted from the light source 10 and focused by the condensing lens 20 in a predetermined direction.

[0021] As shown in Figure 2, the first optical element 31 is formed in a disc shape. As shown in Figure 3, the first optical element 31 is held between a first recess 4211 provided in a first holding portion 421 (described later) and the lower surface portion of a second holding portion 422 (described later). The first optical element 31 has a plurality of adjacent prism portions 300 and a base portion 303.

[0022] As shown in Figure 2, the second optical element 32 is formed in a disc shape. As shown in Figure 3, the second optical element 32 is held in place by being fitted between a second recess 4222 provided on a second holding portion 422 (described later) and a protrusion 4234 provided on the lower surface of a third holding portion 423 (described later). The second optical element 32 has a plurality of adjacent prism portions 300 and a base portion 303.

[0023] Hereinafter, the multiple prism sections 300 provided on the first optical element 31 will be referred to as multiple first prism sections 300, and the multiple prism sections 300 provided on the second optical element 32 will be referred to as multiple second prism sections 300. In cases where it is not necessary to distinguish between multiple first prism sections 300 and multiple second prism sections 300, they will simply be referred to as multiple prism sections 300.

[0024] Furthermore, the base portion 303 provided on the first optical element 31 may be described as the first base portion 303, and the base portion 303 provided on the second optical element 32 may be described as the second base portion 303. If there is no need to distinguish between the first base portion 303 and the second base portion 303, they may simply be described as base portion 303.

[0025] As shown in Figure 2, a first side portion 311 is provided on the circumference of the first base portion 303. The first side portion 311 is machined into a gear shape so as to mesh with the first gear 411, which will be described later. Also, as shown in Figure 2, a second side portion 321 is provided on the circumference of the second base portion 303. The second side portion 321 is machined into a gear shape so as to mesh with the second gear 412, which will be described later.

[0026] In this embodiment, as shown in Figure 3, the multiple prism sections 300 protrude upward from the base section 303 along the optical axis direction (vertical direction) of the light source 10 in the corresponding optical elements among the first optical element 31 and the second optical element 32. In other words, each of the multiple prism sections 300 protrudes in the same direction from the base section 303 of the corresponding optical element among the first optical element 31 and the second optical element 32 along the optical axis direction (vertical direction) of the light source 10. Each of the multiple prism sections 300 includes a control surface 301 and a connection surface 302, as shown in Figure 4. In other words, in a plan view from above, the upper surface of each of the multiple prism sections 300 is formed by the combination of the control surface 301 and the connection surface 302. Furthermore, in each of the multiple prism sections 300, the control surface 301 is a surface with a larger surface area than the connection surface 302.

[0027] In this embodiment, the first base portion 303 includes a light-diffusing portion 312 that diffuses light, as shown in Figure 2. That is, the base portion 303 of the first optical element 31 includes a light-diffusing portion 312 that diffuses the light emitted from the light source 10, thereby expanding the light irradiation range of the light emitted from the light source 10 to the light-irradiating object 2.

[0028] The light diffusion portion 312 is formed in the thickness direction (vertical direction) of the first optical element 31 on the side opposite to the portion where the multiple prism portions 300 are provided. That is, in this embodiment, as shown in Figure 4, the light diffusion portion 312 is formed on the lower surface of the first base portion 303. As shown in Figures 1 and 4, the light diffusion portion 312 has multiple groove portions 313. Each of the multiple groove portions 313 is formed along an orthogonal direction that is perpendicular to the optical axis direction (vertical direction) of the light source 10 and the adjacent direction D1 in which each of the multiple first prism portions 300 is adjacent to each other. In this embodiment, each of the multiple groove portions 313 is formed linearly along the orthogonal direction on the lower surface of the first optical element 31, excluding the edge of the first optical element 31. Note that each of the multiple groove portions 313 may also be formed on the edge of the first optical element 31.

[0029] Next, the positional relationship and arrangement of the control surface 301 and the connecting surface 302 in the multiple first prism sections 300 and the multiple second prism sections 300 will be explained using Figures 7 and 8.

[0030] In each prism portion 300 of the first optical element 31 and the second optical element 32, the positional relationship and arrangement of the control surface 301 and the connecting surface 302 are made the same for both the first optical element 31 and the second optical element 32, as shown in Figure 7, for example. In this case, the angle α of the incident light at each control surface 301 of the first optical element 31 and the second optical element 32 are added together. That is, the light emitted from the condensing lens 20 passes through each control surface 301 of the first optical element 31 and the second optical element 32 and is irradiated in a direction shifted by an angle of 2α with respect to the axis along the optical axis direction (vertical direction) of the light source 10.

[0031] In each prism portion 300 of the first optical element 31 and the second optical element 32, the positional relationship and arrangement of the control surface 301 and the connecting surface 302 are reversed for the first optical element 31 and the second optical element 32, as shown in Figure 8, for example. In this case, the angle α of the incident light at each control surface 301 of the first optical element 31 and the second optical element 32 cancels out. That is, the light emitted from the condensing lens 20 passes through each control surface 301 of the first optical element 31 and the second optical element 32 and is irradiated in the axial direction along the optical axis direction (up and down direction) of the light source 10.

[0032] Here, the arrangement of the first optical element 31 and the second optical element 32 shown in Figure 8 (hereinafter referred to as the direct-below irradiation arrangement) will be used as an example to explain the irradiation pattern. When the first optical element 31 and the second optical element 32 are in a direct-below irradiation arrangement, if the light diffusion portion 312 is not formed on the lower surface of the first base portion 303, the light irradiated onto the irradiation target 2 may result in irradiation pattern A2 in Figure 9. Irradiation pattern A2 is an elliptical irradiation pattern with its major axis aligned with the orthogonal direction and its minor axis aligned with the adjacent direction D1. When irradiating an irradiation target 2 located along the optical axis direction (vertical direction) of the light source 10, if two or more optical elements are used to irradiate the light, distortion may occur that prevents the irradiation pattern from becoming circular. Therefore, by forming the light diffusion portion 312 in this embodiment on the lower surface of the first base portion 303, it is possible to expand irradiation pattern A2 along the minor axis direction (adjacent direction D1) to irradiation pattern A1 and change it to a circular shape, as shown in Figure 9. In other words, each of the multiple grooves 313 of the light diffusion section 312 can expand the light irradiation range of the light emitted from the light source 10 to the light target 2 in a direction adjacent to each other (for example, adjacent direction D1). That is, in this embodiment, the light diffusion section 312 expands the light irradiation range of the light emitted from the light source 10 to the light target 2 along the adjacent direction D1.

[0033] (2.1.4) Operation section As shown in Figure 5, the operating unit 40 includes a first rotation operating unit 41 having a first rotation function and a second rotation operating unit 42 having a second rotation function. The operating unit 40 includes a holding unit 42a (see Figure 3) as the second rotation operating unit 42. The operating unit 40 has the function of rotating the first optical element 31 and the second optical element 32 relative to each other using an axis along the optical axis direction (vertical direction) of the light source 10 as the axis of rotation.

[0034] (2.1.4.1) First Rotation Operation Section As shown in Figure 6, the first rotational operation unit 41 has a first gear section 43 and a second gear section 44.

[0035] As shown in Figure 6, the first gear section 43 includes a first gear 411 and a first support section 414.

[0036] The first gear 411 is formed in a disc shape with its central axis aligned with the optical axis of the light source 10. Multiple teeth formed on the outer circumference of the first gear 411 are located around the entire circumference, and these teeth mesh with the first side portion 311 of the first optical element 31, as well as the third gear 413, which will be described later.

[0037] The first support column 414 functions as a rotating shaft that rotates the first gear 411. The first tip of the lower end of the first support column 414 protrudes downward from the lower surface of the first retaining portion 421, as shown in Figure 1. The second tip of the upper end of the first support column 414 passes through the through hole 4221 provided in the second retaining portion 422 and is inserted into the fourth recess 4233 provided in the third retaining portion 423, as shown in Figure 2.

[0038] As shown in Figure 6, the second gear section 44 includes a second gear 412, a third gear 413, and a second support column section 415.

[0039] The second gear 412 is formed in a disc shape with its central axis aligned with the optical axis of the light source 10. Multiple teeth that mesh with multiple teeth provided on the second side portion 321 of the second optical element 32 are formed on the outer circumferential surface of the second gear 412 all around. Multiple teeth that mesh with the first gear 411 of the first gear portion 43 are formed on the outer circumferential surface of the third gear 413 all around. The second gear 412 and the third gear 413 are arranged in the third recess 4223 (see Figure 2) provided in the second holding portion 422.

[0040] The second support column 415 functions as a rotating shaft for rotating the second gear 412 and the third gear 413. The second gear 412 and the third gear 413 are positioned in the third recess 4223 provided in the second retaining portion 422. The third tip of the lower end of the second support column 415 is inserted into a recess provided on the upper side of the first retaining portion 421. The fourth tip of the upper end of the second support column 415 is inserted into a fifth recess 4235 provided in the third retaining portion 423. As a result, the second gear portion 44 is held between the first retaining portion 421 and the third retaining portion 423, as shown in Figure 1.

[0041] As described above, the first rotational operation unit 41 can transmit rotational force to the first optical element 31 and the second optical element 32 via the first gear section 43 and the second gear section 44. In other words, the first rotational operation unit 41 has a first rotational function.

[0042] More specifically, the first rotation function rotates the first optical element 31 in the direction in which a first rotational force is applied to it, and also rotates the second optical element 32 in the opposite direction to the rotation direction of the first optical element 31 by applying a second rotational force to the second optical element 32.

[0043] Based on the above, the first optical element 31 and the second optical element 32 rotate in opposite directions to each other in response to the operation of the first support column 414 included in the first gear section 43.

[0044] (2.1.4.2) Second Rotation Control Section The holding part 42a, which functions as the second rotation operation part 42, holds the first optical element 31 and the second optical element 32, and rotates around an axis aligned with the optical axis direction (vertical direction) of the light source 10, thereby having a second rotation function. That is, the first optical element 31 and the second optical element 32 rotate in the same direction by the same amount as the holding part 42a rotates. However, the amount of rotation of the first optical element 31 and the second optical element 32 is not limited to being the same.

[0045] The holding portion 42a, which is the second rotational operating portion 42, is formed in an annular shape with its central axis aligned with the optical axis of the light source 10, as shown in Figure 3. The first holding portion 421 has a first recess 4211. The first recess 4211 is formed in a circular shape when viewed from above, and houses the first optical element 31.

[0046] As shown in Figures 2 and 3, the second holding portion 422 is formed in a cylindrical shape with its central axis aligned with the optical axis of the light source 10. The second holding portion 422 has a through hole 4221, a second recess 4222, and a third recess 4223. The through hole 4221 penetrates the second holding portion 422 in the vertical direction, and the first support portion 414 of the first gear portion 43 is inserted through it. The second recess 4222 is formed in a circular shape when viewed from above, and accommodates the second optical element 32. The third recess 4223 is formed in an elliptical shape when viewed from below, and accommodates the first gear 411 of the first gear portion 43, the second gear 412 of the second gear portion 44, and the third gear 413.

[0047] As shown in Figures 2 and 3, the third retaining portion 423 is formed in a cylindrical shape with its central axis aligned with the optical axis of the light source 10. The third retaining portion 423 has a fourth recess 4233, a protrusion 4234, and a fifth recess 4235. The fourth recess 4233 is formed in a circular shape when viewed from below, and the second tip (upper end) of the first support portion 414 of the first gear portion 43 is inserted into it. The fifth recess 4235 is formed in a circular shape when viewed from below, and the fourth tip (upper end) of the second support portion 415 of the second gear portion 44 is inserted into it. The protrusion 4234 protrudes downward from the lower surface of the third retaining portion 423 around its entire circumference.

[0048] The first optical element 31 is held vertically between the first retaining portion 421 and the second retaining portion 422. More specifically, as shown in Figure 3, the first optical element 31 is held sandwiched between the bottom surface of the first recess 4211 of the first retaining portion 421 and the bottom surface of the second retaining portion 422. At this time, the multiple first prism portions 300 provided on the first optical element 31 are housed within the second retaining portion 422. The first retaining portion 421 and the second retaining portion 422 are fixed together using three first screws 70.

[0049] The second optical element 32 is held vertically between the second holding portion 422 and the third holding portion 423. More specifically, the second optical element 32 is held sandwiched between the bottom surface of the second recess 4222 of the second holding portion 422 and the convex portion 4234 of the third holding portion 423. At this time, the multiple second prism portions 300 provided on the second optical element 32 are housed in the third holding portion 423. The second holding portion 422 and the third holding portion 423 are fixed together using three second screws 71.

[0050] As shown in Figures 1 and 2, the third retaining portion 423 further includes a first operating recess 4231 and a second operating recess 4232.

[0051] The first operating recess 4231 is a groove formed on the outer circumference of the third holding portion 423, as shown in Figure 1. Specifically, an operating projection 51 provided on the inner surface of the cover body 50a is fitted into the second operating recess 4232 so that the second rotating operating portion 42 can rotate. The second operating recess 4232 is connected to the first operating recess 4231 in the vertical direction. There are two second operating recesses 4232 on the outer circumference of the third holding portion 423. Note that only one second operating recess 4232 is shown in Figure 1, and the other is located at a point symmetrical position with respect to the optical axis direction of the light source 10.

[0052] Here, when the second rotation operation unit 42 is rotated along the first operation recess 4231 so that the operation projection 51 passes through it, the first optical element 31 and the second optical element 32 rotate in the same direction by the same amount with the axis of rotation being the axis of rotation along the optical axis direction (vertical direction) of the light emitted from the light source 10. Note that the object rotated by the second rotation operation unit 42 is not limited to the first optical element 31 and the second optical element 32. The object rotated by the second rotation operation unit 42 may be at least one of the light source 10 and the condensing lens 20 combined. Alternatively, a groove may be formed in the first holding part 421 so that the first support part 414 can move in the circumferential direction, and the first rotation operation unit 41 may be rotated in the circumferential direction of the first holding part 421 inside the lighting fixture 1. Alternatively, the first rotation operation unit 41, the first optical element 31, and the second optical element 32 may be combined and rotated in the circumferential direction of the first holding unit 421 using an axis along the optical axis direction (vertical direction) of the light source 10 as the axis of rotation. Furthermore, the amount of rotation of the first optical element 31 and the second optical element 32 is not limited to being the same.

[0053] (2.2) Cover body (position control section) As shown in Figure 1, the cover body 50a, which serves as the positioning unit 50, is formed in a bottomed cylindrical shape with an open bottom and houses the lighting device 80. A flange portion 501 that protrudes outward is formed around the entire circumference of the open end edge of the cover body 50a.

[0054] As shown in Figure 3, the positioning section 50 (cover body 50a) has two operating protrusions 51. The two operating protrusions 51 are formed on the inner circumferential surface of the cover body 50a at positions facing each other. More specifically, the two operating protrusions 51 are positioned axially symmetric with respect to the central axis of the cover body 50a in a plan view from the top and bottom.

[0055] Each of the two operating protrusions 51 is fitted into the first operating recess 4231 through the corresponding second operating recess 4232 of the two second operating recesses 4232 formed in the third holding portion 423. This combines the second rotation operating portion 42 and the position operating portion 50. The fitting of the two operating protrusions 51 into the first operating recess 4231 allows the second rotation operating portion 42 to rotate relative to the position operating portion 50. In other words, the operating protrusions 51 contribute to the second rotation operating portion 42 performing its second rotation function.

[0056] Furthermore, the cover body 50a can serve as a fixing device for, for example, fixing to the ceiling. Specifically, the cover body 50a, which houses the lighting device 80, is inserted into a recessed hole formed in the ceiling of the facility, and then the ceiling material is sandwiched between a pair of mounting springs (not shown) and the flange portion 501 of the cover body 50a, thereby attaching the lighting device 1 to the ceiling. Note that the location for fixing the cover body 50a is not limited to the ceiling. The location for fixing the cover body 50a may be the floor or the wall.

[0057] The position control unit 50 has the function of moving the focusing lens 20 in the optical axis direction (up and down direction) of the light source 10. In other words, the position control unit 50 makes it possible to adjust the range of light emitted by the lighting fixture 1 by adjusting the distance between the light source 10 and the focusing lens 20.

[0058] (3) Advantages As described above, the lighting fixture 1 according to this embodiment comprises a light source 10, a first optical element 31, and a second optical element 32. The first optical element 31 and the second optical element 32 are arranged side by side along the optical axis direction of the light source 10 and have the function of bending the light emitted from the light source 10 in a predetermined direction. Each of the first optical element 31 and the second optical element 32 has a plurality of prism portions 300 and a base portion 303. Each of the plurality of adjacent prism portions 300 protrudes from the base portion 303 of the corresponding optical element among the first optical element 31 and the second optical element 32 in the same direction along the optical axis direction. The base portion 303 of the first optical element 31 includes a light diffusion portion 312 that diffuses light to broaden the light irradiation range to the light irradiation target 2. The light diffusion portion 312 is formed in the thickness direction of the first optical element 31 on the side opposite to the portion where the plurality of prism portions 300 are provided.

[0059] With this configuration, by forming a light diffusion portion 312 on the base portion 303 of the first optical element 31, the light that causes distortion in the irradiation pattern can be diffused, and the irradiation pattern can be adjusted. In other words, the possibility of distortion occurring in the irradiation pattern can be reduced.

[0060] (4) Variations (modified version) The following are examples of modifications. These modifications can be applied in appropriate combinations with the above-described embodiments.

[0061] (4.1) Variation 1 In the above embodiment, the multiple prism sections 300 are configured such that, in the first optical element 31 and the second optical element 32, corresponding optical elements protrude upward from the base section 303 along the optical axis direction (vertical direction) of the light source 10, but the configuration is not limited to this. The multiple first prism sections 300 may also be arranged so that, in the first optical element 31, they protrude downward from the first base section 303 along the optical axis direction (vertical direction) of the light source 10. As shown in Figure 10, the multiple second prism sections 300 may also be arranged so that, in the second optical element 32, they protrude downward from the second base section 303 along the optical axis direction (vertical direction) of the light source 10. Furthermore, as shown in Figure 11, the multiple first prism sections 300 and the multiple second prism sections 300 may each be arranged so that, in the corresponding first optical element 31 and the second optical element 32, they protrude downward from the corresponding base section 303 along the optical axis direction (vertical direction) of the light source 10.

[0062] (4.2) Modification 2 In the above embodiment, the base portion 303 of the first optical element 31, of the two optical elements 32, includes a light diffusion portion 312 that diffuses the light emitted from the light source 10, but the configuration is not limited to this. As shown in Figure 12, the base portions 303 of both the first optical element 31 and the second optical element 32 may both include a light diffusion portion that diffuses the light emitted from the light source 10, thereby expanding the light irradiation range for the object to be irradiated 2.

[0063] Alternatively, the first optical element 31 may be placed between the light source 10 and the second optical element 32.

[0064] (4.3) Modification example 3 In the above embodiment, each of the multiple grooves 313 is formed linearly on the lower surface of the first optical element 31, excluding the edge of the first optical element 31, along an orthogonal direction perpendicular to the vertical direction and the adjacent direction D1, but the embodiment is not limited to this configuration. Each of the multiple grooves 313 may have a partially interrupted linear configuration, as shown in Figure 13. In the configuration where each of the multiple grooves 313 is a partially interrupted linear configuration, in Figure 13 each of the multiple grooves 313 is formed up to the edge of the first optical element 31, but each of the multiple grooves 313 does not have to be formed at the edge of the first optical element 31.

[0065] (4.4) Modification 4 In the above embodiment, the light diffusing portion 312 has a configuration having a plurality of grooves 313, but is not limited to this configuration. The light diffusing portion 312 may have a plurality of protrusions 314 that protrude downward along the optical axis direction (vertical direction) and are formed along an orthogonal direction perpendicular to the optical axis direction (vertical direction) and the adjacent direction D1, instead of a plurality of grooves 313. That is, the light diffusing portion 312 has a plurality of protrusions 314, and each of the plurality of protrusions 314 is formed along an orthogonal direction. For example, as shown in Figure 14, each of the plurality of protrusions 314 is formed linearly in the orthogonal direction. In the configuration in which the plurality of protrusions 314 are formed instead of a plurality of grooves 313, in Figure 14 each of the plurality of protrusions 314 is formed up to the edge of the first optical element 31, but each of the plurality of protrusions 314 is not required to be formed at the edge of the first optical element 31.

[0066] Furthermore, each of the multiple protrusions 314 may have a partially interrupted linear configuration, as shown in Figure 15. In the case where each of the multiple protrusions 314 has a partially interrupted linear configuration, in Figure 15 each of the multiple protrusions 314 is formed up to the edge of the first optical element 31, but each of the multiple protrusions 314 does not have to be formed at the edge of the first optical element 31.

[0067] (4.5) Modification 5 In the above embodiment, the light diffusion section 312 is configured to expand the light irradiation range of the light emitted from the light source 10 to the light-illuminating target 2 along the adjacent direction D1, but the configuration is not limited to this. The direction in which each of the plurality of grooves 313 of the light diffusion section 312 is adjacent to each other may be along an orthogonal direction perpendicular to the optical axis direction (up and down direction) and the adjacent direction D1. The light irradiation range of the light emitted from the light source 10 to the light-illuminating target 2 expands along the direction in which each of the plurality of grooves 313 of the light diffusion section 312 is adjacent to each other. In this case, the light diffusion section 312 can expand the light irradiation range of the light emitted from the light source 10 to the light-illuminating target 2 in an orthogonal direction. More specifically, in Modification 5, the light diffusion section 312 expands, for example, the irradiation pattern A2 shown in Figure 9 along the long axis direction (orthogonal direction). In other words, the light diffusion section 312 may be configured to expand the light irradiation range of the light emitted from the light source 10 to the light-illuminating target 2 along an orthogonal direction.

[0068] As described above, by changing the direction in which each of the multiple grooves 313 is adjacent to one another, the direction in which the illumination range of the light emitted from the light source 10 onto the illuminated object 2 is expanded can be freely changed.

[0069] (4.6) Variation 6 In the above embodiment, the first operating recess 4231 is formed around the entire circumference of the third holding portion 423, as shown in Figure 1, but the embodiment is not limited to this configuration. The first operating recess 4231 may be partially broken, and the lighting device 80 may not be rotatable in the circumferential direction relative to the cover body 50a.

[0070] (summary) As described above, the lighting fixture (1) of the first embodiment comprises a light source (10), a first optical element (31), and a second optical element (32). The first optical element (31) and the second optical element (32) are arranged side by side along the optical axis of the light source (10) and have the function of bending the light emitted from the light source (10) in a predetermined direction. Each of the first optical element (31) and the second optical element (32) has a plurality of prism portions (300) and a base portion (303). Each of the plurality of adjacent prism portions (300) protrudes from the base portion (303) of the corresponding optical element among the first optical element (31) and the second optical element (32) in the same direction along the optical axis. The base portion (303) of the first optical element (31) includes a light diffusing portion (312) that diffuses light to broaden the range of light illumination (e.g., illumination pattern A2) for the object to be illuminated (2). The light-diffusing portion (312) is formed in the thickness direction of the first optical element (31) on the side opposite to the portion where the multiple prism portions (300) are provided.

[0071] According to this embodiment, by forming a light diffusion portion (312) on the base portion (303) of the first optical element (31), the light that causes distortion in the irradiation pattern can be diffused, and the irradiation pattern can be adjusted. In other words, the possibility of distortion occurring in the irradiation pattern can be reduced.

[0072] In the second embodiment of the lighting fixture (1), in the first embodiment, the light diffusing section (312) expands the illumination range (e.g., illumination pattern A2) along the adjacent direction (D1) in which each of the plurality of prism sections (300) of the first optical element (31) is adjacent to each other.

[0073] According to this embodiment, the light emitted from the light source (10) is diffused by the light diffusion section (312), allowing the irradiation pattern to be adjusted in adjacent directions (D1) where multiple prism sections (300) are adjacent.

[0074] In the third embodiment of the lighting fixture (1), in the second embodiment, the light diffusing portion (312) has a plurality of groove portions (313). Each of the plurality of groove portions (313) is formed along an orthogonal direction that is perpendicular to the optical axis direction of the light source (10) and to the adjacent direction (D1) in which each of the plurality of prism portions (300) of the first optical element (31) is adjacent to each other.

[0075] According to this embodiment, by forming a plurality of grooves (313) aligned in a perpendicular direction as the light diffusion portion (312), the irradiation pattern can be adjusted in the adjacent direction (D1) where the plurality of prism portions (300) are adjacent.

[0076] In the fourth embodiment of the lighting fixture (1), in the second embodiment, the light diffusing portion (312) has a plurality of protrusions (314). Each of the plurality of protrusions (314) is formed along an orthogonal direction perpendicular to the optical axis direction and the adjacent direction (D1).

[0077] According to this embodiment, by forming a plurality of protrusions (314) aligned in a perpendicular direction as the light diffusion portion (312), the irradiation pattern can be adjusted in the adjacent direction (D1) where the plurality of prism portions (300) are adjacent.

[0078] In the fifth embodiment of the lighting fixture (1), in any of the first to fourth embodiments, the second optical element (32) is positioned between the light source (10) and the first optical element (31).

[0079] According to this embodiment, even when the second optical element (32) is placed between the light source (10) and the first optical element (31), the possibility of distortion occurring in the irradiation pattern can be reduced.

[0080] In the sixth embodiment of the luminaire (1), in any of the first to fifth embodiments, the luminaire (1) further comprises an operating unit (40). The operating unit (40) has the function of rotating each of the first optical element (31) and the second optical element (32) relative to each other with respect to an axis of rotation along the optical axis of the light source (10).

[0081] According to this embodiment, even when the lighting fixture (1) has a function to rotate the first optical element (31) and the second optical element (32) relative to each other, the possibility of distortion occurring in the irradiation pattern can be reduced. [Explanation of Symbols]

[0082] 1 Lighting fixtures 2. Target of irradiation 10 light source 31 First optical element 32. Second optical element 40 Control section 300 Prism section 303 Base section 312 Light Diffusion Section 313 Groove 314 Protrusion D1 Adjacent Direction

Claims

1. Light source and The light source is arranged in parallel along the optical axis direction and comprises a first optical element and a second optical element that have the effect of bending the light emitted from the light source in a predetermined direction. Each of the first optical element and the second optical element has a plurality of adjacent prism portions and a base portion. Each of the plurality of prism sections protrudes from the base section of the corresponding optical element among the first and second optical elements in the same direction along the optical axis, The base portion of the first optical element includes a light diffusing portion that diffuses the light to broaden the irradiation range of the light on the object to be irradiated with the light, The light diffusing portion is formed in the thickness direction of the first optical element on the side opposite to the portion where the plurality of prism portions are provided. Lighting fixtures.

2. The light diffusion section expands the irradiation range along the adjacent direction in which each of the plurality of prism sections of the first optical element is adjacent to each other. The lighting fixture according to claim 1.

3. The light-diffusing portion has a plurality of grooves, Each of the plurality of grooves is formed along an orthogonal direction perpendicular to the optical axis and the adjacent direction. The lighting fixture according to claim 2.

4. The light-diffusing portion has a plurality of protrusions, Each of the plurality of protrusions is formed along an orthogonal direction perpendicular to the optical axis and the adjacent direction. The lighting fixture according to claim 2.

5. The second optical element is positioned between the light source and the first optical element. The lighting fixture according to claim 1.

6. The lighting fixture further comprises an operating unit having the function of rotating each of the first optical element and the second optical element relative to each other with an axis along the optical axis as the axis of rotation. A lighting fixture according to any one of claims 1 to 5.

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