Lighting fixtures

Abstract

The objective of this disclosure is to reduce light loss. [Solution] The lighting fixture 1 comprises a light source 10, a pair of optical elements, and an operating unit 40. The pair of optical elements are arranged along the optical axis of the light source 10 and have a refraction effect that refracts the light emitted from the light source 10. The operating unit 40 adjusts the rotation of the pair of optical elements, which are configured to rotate around a rotation axis. The pair of optical elements change the direction in which they refract the light emitted from the light source 10 in response to the operation of the operating unit 40. Of the pair of optical elements, the optical element 20, which is positioned closer to the light source 10, further has a focusing effect that concentrates the light emitted from the light source 10.

Description

Technical Field

[0001] The present disclosure generally relates to lighting fixtures, and more particularly to lighting fixtures capable of changing the optical axis of the irradiated light.

Background Art

[0002] 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 body having an open lower surface and configured to house 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

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a lighting fixture as described in Patent Document 1 includes a condenser lens in addition to the first prism panel and the second prism panel in order to improve the directivity of the light irradiated from the lighting fixture, there is a possibility that the light loss will increase.

[0005] In view of the above problems, the present disclosure is made, and an object thereof is to provide a lighting fixture that reduces light loss.

Means for Solving the Problems

[0006] A lighting fixture according to one aspect of the present disclosure comprises a light source, a pair of optical elements arranged along the optical axis of the light source and having a refractive function that refracts light emitted from the light source, and an operating unit for adjusting the rotation of the pair of optical elements which are configured to be rotatable about a rotation axis. The pair of optical elements change the direction in which they refract the light in response to the operation of the operating unit. Of the pair of optical elements, the optical element positioned closer to the light source further has a focusing function that concentrates the light. [Effects of the Invention]

[0007] According to this disclosure, light loss can be reduced. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is an exploded 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 side view showing a portion of the second optical element of the same lighting fixture. [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 pair of optical elements and the first rotary control unit of the same lighting fixture. [Figure 7] Figure 7 is a schematic diagram illustrating the principle of light refraction by a pair of optical elements in the same lighting fixture. [Figure 8] Figure 8 is a schematic diagram illustrating the principle of light refraction by a pair of optical elements in the same lighting fixture. [Figure 9] Figure 9 is a schematic diagram illustrating the principle of light refraction by a pair of optical elements in the lighting fixture of Modification 1. [Figure 10] Figure 10 is a block diagram showing the configuration of the lighting fixture in modified example 5. [Figure 11]FIG. 11 is a side view showing a part of the second optical element included in the lighting fixture of Modification 6. [Figure 12] FIG. 12 is a side view showing a part of the second optical element included in the lighting fixture of Modification 7. [Figure 13] FIG. 13 is a side view showing a part of the second optical element included in the lighting fixture of Modification 8.

Mode for Carrying Out the Invention

[0009] The embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Even outside the following embodiments and modifications, various changes can be made according to the design and the like as long as the technical idea according to the present disclosure is not deviated from.

[0010] Hereinafter, the lighting fixture 1 according to the present embodiment will be described with reference to the drawings. Note that the arrows indicating "up" and "down" in the drawings are merely for explanation and do not accompany any entity.

[0011] (1) Outline As shown in FIGS. 1 to 3 and FIG. 5, the lighting fixture 1 according to the present embodiment includes a light source 10, a pair of optical elements (a first optical element 20 and a second optical element 32), and an operation unit 40.

[0012] The pair of optical elements are arranged along the optical axis Ax1 of the light source 10 and have a refracting action of refracting the light emitted from the light source 10.

[0013] The operation unit 40 adjusts the rotation of the pair of optical elements configured to be rotatable about a rotation axis.

[0014] The pair of optical elements change the direction of refracting the light emitted from the light source 10 according to the operation of the operation unit 40.

[0015] Of the pair of optical elements, the optical element (first optical element 20) arranged at a position closer to the light source 10 further has a condensing action of condensing the light emitted from the light source 10.

[0016] Here, the "optical axis" as referred to in the present disclosure means a virtual light ray that represents the light beam passing through the entire system. As an example, the optical axis Ax1 of the light source 10 coincides with the axis of rotational symmetry of the light emitted from the light source 10.

[0017] Also, the "refractive effect" as referred to in the present disclosure indicates the strength of refracting the light incident on the optical element. That is, the stronger the refractive effect of the optical element, the larger the refraction angle of the light emitted from the optical element with respect to the incident angle of the light incident on the optical element.

[0018] Furthermore, the "condensing effect" as referred to in the present disclosure indicates the strength of condensing the light incident on the optical element. That is, the stronger the condensing effect of the optical element, the smaller the light distribution angle of the light emitted from the optical element with respect to the light distribution angle of the light incident on the optical element.

[0019] According to the above configuration, compared with the case where the lighting fixture 1 separately includes an optical element having a refractive effect and an optical element having a condensing effect, the number of optical elements through which the light emitted from the light source 10 passes can be reduced. Thereby, the loss of the light emitted from the light source 10 can be reduced. Also, thereby, miniaturization of the lighting fixture 1 can be achieved.

[0020] (2) Configuration The lighting fixture 1 is installed, for example, in a store, an office, a theater, a commercial facility, a hall, or a house. The lighting fixture 1 is, for example, an embedded downlight, and is embedded in a building material such as a ceiling panel and arranged to illuminate downward.

[0021] As shown in FIG. 1, the lighting fixture 1 includes a lighting device 80 and a cover body 50a as a position operation unit 50.

[0022] (2.1) Lighting Device As shown in FIGS. 1 to 3, the lighting device 80 has a light source 10, a pair of optical elements (first optical element 20, second optical element 32), and an operation unit 40.

[0023] (2.1.1) Light source The light source 10 emits light. More specifically, the light source 10 is a device that converts power supplied from an external power source into light and emits it. The light source 10 has, for example, a plurality of light-emitting elements. Each of the plurality of light-emitting elements is, for example, an LED (Light Emitting Diode). The light color (color temperature) of the light emitted from the plurality of light-emitting elements may be the same or different. Each of the plurality of light-emitting elements is, for example, an LED (Light Emitting Diode). However, the light source 10 may have light-emitting elements other than LEDs, such as organic EL (Electro Luminescence) elements or laser diodes.

[0024] (2.1.2) A pair of optical elements The pair of optical elements, the first optical element 20 and the second optical element 32, are made of a light-transmitting material, such as acrylic, silicone-based resin material, or transparent resin material such as polycarbonate, or glass material. In this embodiment, both the first optical element 20 and the second optical element 32 are formed in a substantially disc shape.

[0025] The first optical element 20 and the second optical element 32 are arranged along the optical axis Ax1 of the light emitted from the light source 10. More specifically, the first optical element 20 and the second optical element 32 are arranged substantially parallel to each other. However, the first optical element 20 and the second optical element 32 may be arranged at an angle to each other.

[0026] In this embodiment, the optical axis Ax1 is assumed to be aligned in the vertical direction. That is, the first optical element 20 and the second optical element 32 are arranged along the vertical direction. Here, as shown in Figures 2 and 3, of the first optical element 20 and the second optical element 32, the first optical element 20 is positioned closer to the light source 10.

[0027] Furthermore, the first optical element 20 and the second optical element 32 are configured to be rotatable about the optical axis Ax1 by operating the operating unit 40. In other words, the axis of rotation of the first optical element 20 and the second optical element 32 is the optical axis Ax1.

[0028] The first optical element 20 and the second optical element 32 have a refractive effect that refracts light emitted from the light source 10. In this embodiment, the first optical element 20 refracts the light emitted from the light source 10 and incident on the first optical element 20. The second optical element 32 refracts the light emitted from the light source 10 and incident on the second optical element 32 via the first optical element 20. The light refracted by the second optical element 32 is emitted to the outside of the lighting fixture 1.

[0029] In this embodiment, the refractive action of the first optical element 20 and the second optical element 32 is the same. Specifically, the first optical element 20 and the second optical element 32 have a refractive action that refracts incident light by a refractive angle α from the direction of incidence. However, the refractive actions of the first optical element 20 and the second optical element 32 may be different.

[0030] In addition to the refraction function described above, the first optical element 20 also has a light-gathering function that concentrates light. Specifically, the first optical element 20 is formed in a substantially disc shape and is a lens (for example, a Fresnel lens) having both refraction and light-gathering functions. As shown in Figure 3, the first optical element 20 is formed in a rotationally asymmetric shape with respect to the optical axis Ax1. The first optical element 20 is formed in a rotationally asymmetric shape so as to refract the light incident on the first optical element 20 by a desired angle (refraction angle α in this embodiment) from the direction of incidence. Here, "rotationally asymmetric" means that the shape of the first optical element 20 is asymmetric with respect to its rotation axis (optical axis Ax1 in this embodiment).

[0031] The first optical element 20 refracts light by a refraction angle α in one direction (first direction) with respect to the optical axis Ax1 when viewed from above or below.

[0032] The side surface 201 of the first optical element 20 is machined in a gear-like pattern around its entire circumference.

[0033] The second optical element 32 is a prism panel formed in a roughly disc shape and has a refractive effect that refracts incident light by a refraction angle α from the direction of incidence. When viewed from above or below, the second optical element 32 refracts light by a refraction angle α in one direction (second direction) with respect to the optical axis Ax1.

[0034] As shown in Figure 3, the second optical element 32 is held in place by being fitted between the second recess 4222 provided in the second holding portion 422 and the protrusion 4234 provided on the lower surface of the third holding portion 423.

[0035] As shown in Figures 3 and 4, the second optical element 32 has a disc-shaped base portion 303 and a plurality of protrusions 300 projecting upward from the upper surface of the base portion 303. The plurality of protrusions 300 are formed in a line along one direction so that their cross-sectional shape is sawtooth-like. Each protrusion 300 has a control surface 301 and a connection surface 302, and the control surface 301 and the connection surface 302 form an acute angle.

[0036] Furthermore, the side surface 321 of the base portion 303 is machined in a gear-like pattern around its entire circumference.

[0037] (2.1.3) Operation section As shown in Figures 2, 3, 5, and 6, the operating unit 40 includes a first rotation operating unit 41 and a second rotation operating unit 42.

[0038] (2.1.3.1) First Rotation Operation Section The first rotation operation unit 41 has a first rotation function that rotates the first optical element 20 and the second optical element 32 in opposite directions to each other.

[0039] As shown in Figure 6, the first rotational operation unit 41 has a first gear section 43 and a second gear section 44.

[0040] The first gear section 43 includes a first gear 411 and a first support section 414.

[0041] The first gear 411 meshes with the side portion 321 of the second optical element 32 and the third gear 413, which will be described later.

[0042] The first support column 414 is a rod-shaped member that extends in the vertical direction. The first support column 414 is fitted into a fitting hole provided in the center of the first gear 411. As a result, the first gear 411 rotates together with the first support column 414. Also, as shown in Figure 1, the lower end of the first support column 414 protrudes outward from the first holding portion 421.

[0043] The second gear section 44 includes a second gear 412, a third gear 413, and a second support column section 415.

[0044] As shown in Figure 6, the second gear 412 meshes with the side portion 201 of the first optical element 20.

[0045] The third gear 413 meshes with the first gear 411, as shown in Figure 6.

[0046] The second support column 415 is a rod-shaped member that extends in the vertical direction. The second support column 415 is fitted into a fitting hole provided in the center of the second gear 412 and a fitting hole provided in the center of the third gear 413. As a result, the second gear 412 and the third gear 413 rotate together with the second support column 415. In other words, the second support column 415 transmits rotational force between the second gear 412 and the third gear 413.

[0047] The second gear 412 and the third gear 413 pass through the through hole H1 (see Figure 2) provided in the second retaining portion 422 and are inserted into the recess H2 (see Figure 2) provided in the third retaining portion 423.

[0048] With the above configuration, the user rotates the lower end of the first support column 414 that protrudes outward from the first holding portion 421, causing the first gear 411 to rotate in the first rotational direction. As the first gear 411 rotates in the first rotational direction, the second optical element 32, which meshes with the first gear 411 and its side portion 321, rotates in the second rotational direction opposite to the first rotational direction. Also, as the first gear 411 rotates in the first rotational direction, the third gear 413, which meshes with the first gear 411, rotates in the second rotational direction. The rotation of the third gear 413 in the second rotational direction is transmitted to the second gear 412 by the second support column 415. In other words, the second gear 412 rotates in the second rotational direction. As the second gear 412 rotates in the second rotational direction, the first optical element 20, which meshes with the second gear 412 and its side portion 201, rotates in the first rotational direction. In other words, by rotating the lower end of the first support column 414, the user can rotate the first optical element 20 and the second optical element 32 in opposite directions around the axis of rotation (optical axis Ax1). In this embodiment, each part of the first rotation operation unit 41 is configured to rotate the first optical element 20 and the second optical element 32 by the same amount (same angle) in opposite directions around the optical axis Ax1. In other words, the first rotation operation unit 41 rotates each of the first optical element 20 and the second optical element 32 by the same amount in opposite directions around the optical axis Ax1. This simplifies the operation for rotating the first optical element 20 and the second optical element 32.

[0049] Furthermore, the operating unit 40 may further include an operation receiving unit that indirectly transmits user operations to the first rotary operating unit 41. The operation receiving unit is, for example, a dial, lever, slide switch, etc., and the first rotary operating unit 41 converts the user operations received by the operation receiving unit into a force that rotates the first optical element 20 and the second optical element 32 by the same amount in opposite directions.

[0050] (2.1.3.2) Second Rotation Control Section The second rotation operation unit 42 is a substantially cylindrical member that is open in the vertical direction. As shown in Figure 3, the second rotation operation unit 42 holds the light source 10, the first optical element 20, and the second optical element 32. The second rotation operation unit 42 also has a second rotation function that rotates the first optical element 20 and the second optical element 32 in the same direction by the same amount.

[0051] As shown in Figures 1 to 3, the second rotating operation section 42 has a first holding section 421 formed in a substantially annular shape, a second holding section 422 formed in a substantially cylindrical shape, and a third holding section 423 formed in a substantially cylindrical shape.

[0052] As shown in Figure 2, the first retaining part 421 is screwed to the second retaining part 422 from below by the first screw 70. The second retaining part 422 is screwed to the third retaining part 423 from below by the second screw 71. In other words, the first retaining part 421, the second retaining part 422, and the third retaining part 423 are fixed to each other in the order of first retaining part 421, second retaining part 422, and third retaining part 423 from bottom to top.

[0053] The first holding portion 421 and the second holding portion 422 are provided with a first recess 4211 and a second recess 4222, respectively, capable of holding an optical element. The third holding portion 423 is provided with a protrusion 4234, capable of holding an optical element.

[0054] As shown in Figures 1 and 2, the third retaining portion 423 is provided with a first operating recess 4231 and a second operating recess 4232 on its outer circumferential surface. In this embodiment, the third retaining portion 423 is provided with two second operating recesses 4232.

[0055] The first operating recess 4231 is provided along the entire circumference of the outer surface of the third retaining portion 423 in the circumferential direction. The two second operating recesses 4232 are provided along a direction intersecting the first operating recess 4231. The two second operating recesses 4232 are provided so as to face each other in the radial direction of the third retaining portion 423.

[0056] Each second operating recess 4232 extends from the upper end of the outer circumferential surface of the third retaining portion 423 to the first operating recess 4231. In other words, the lower end of each second operating recess 4232 is spatially continuous with the first operating recess 4231. An operating projection 51 (see Figure 3) of the cover body 50a, which will be described later, is inserted through the first operating recess 4231 via the two second operating recesses 4232.

[0057] (2.2) Cover body The cover body 50a is a substantially cylindrical member with an opening in the vertical direction. The cover body 50a holds the second rotating operation part 42, the light source 10, the first optical element 20, and the second optical element 32, which are held by the second rotating operation part 42, inside.

[0058] As shown in Figure 3, the cover body 50a has a plurality (two in this embodiment) of operating protrusions 51. The two operating protrusions 51 protrude from the inside of the cover body 50a, facing each other. The two operating protrusions 51 restrict the downward movement of the second rotating operating part 42 when the cover body 50a is holding the second rotating operating part 42.

[0059] Here, the second rotary operating section 42 is held by the cover body 50a by being inserted inside the cover body 50a by the user. The insertion operation of the second rotary operating section 42 into the cover body 50a will be described below.

[0060] First, the user inserts the second rotary operating part 42 upward into the inside of the cover body 50a, with the positions of the two operating protrusions 51 aligned with the positions of the two second operating recesses 4232 provided on the second rotary operating part 42 (third holding part 423). As a result, the second rotary operating part 42 is inserted into the inside of the cover body 50a with the two operating protrusions 51 aligned with the two second operating recesses 4232.

[0061] When the second rotary operating section 42 is moved further upward, the lower end of the first operating recess 4231 and the two operating protrusions 51 come into contact. In this state, the user rotates the second rotary operating section 42. As a result, even if the user releases their hand from the second rotary operating section 42, the two operating protrusions 51 come into contact with the upper end of the first operating recess 4231, restricting the downward movement of the second rotary operating section 42. In this state, the second rotary operating section 42 and the light source 10, first optical element 20, and second optical element 32 held by the second rotary operating section 42 can rotate integrally with respect to the cover body 50a.

[0062] Furthermore, the cover body 50a also functions as a position control unit 50. The position control unit 50 moves the first optical element 20 vertically along the optical axis Ax1. In other words, by operating the position control unit 50, the user can change the distance between the first optical element 20, which is a lens, and the light source 10, and adjust the light distribution of the light emitted from the lighting fixture 1 to the outside.

[0063] (3) Example of operation The operation of the lighting fixture 1 when the first rotary operation unit 41 and the second rotary operation unit 42 are operated will be described below.

[0064] First, we will explain the operation of the lighting fixture 1 when the first rotary operation unit 41 is operated.

[0065] As described above, when the first rotation operation unit 41 is operated, the first optical element 20 and the second optical element 32 each rotate by the same amount in opposite directions around the optical axis Ax1. Here, operating the first rotation operation unit 41 means, for example, rotating the first support column 414 that protrudes outward from the first holding unit 421. This makes it possible to adjust the angle difference between the first direction in which the first optical element 20 refracts light by a refraction angle α and the second direction in which the second optical element 32 refracts light by a refraction angle α. As described above, the first direction and the second direction are directions with respect to the optical axis Ax1 when the pair of optical elements are viewed from above and below.

[0066] Here, the direction in which light is emitted from the second optical element 32 to the outside of the illuminator 1 is determined by the angular difference between the first direction and the second direction.

[0067] Specifically, when the angle difference between the first direction and the second direction is 0° (the first and second directions are in the same direction), as shown in Figure 7, the light emitted from the light source 10 is tilted by the first optical element 20 by a refraction angle α in the first direction (to the right in the plane of Figure 7) with respect to the optical axis Ax1, and then further tilted by a refraction angle α in the second direction (to the right in the plane of Figure 7) by the second optical element 32. In other words, the optical axis Ax2 of the light emitted from the second optical element 32 toward the outside of the lighting fixture 1 is tilted by an angle of 2α with respect to the optical axis Ax1.

[0068] Furthermore, when the first rotation control unit 41 is operated so that the angular difference between the first direction and the second direction increases, the optical axis Ax2 approaches the optical axis Ax1 linearly along the radial direction of the circle centered on the optical axis Ax1 (the left-right direction in the plane of paper in Figures 7 and 8), because the refraction effects of the first optical element 20 and the second optical element 32 are the same.

[0069] When the angular difference between the first and second directions is 180° (the first and second directions are opposite), as shown in Figure 8, the light emitted from the light source 10 is tilted by the first optical element 20 in the first direction (to the right in the plane of Figure 8) with respect to the optical axis Ax1 by an angle α of refraction, and by the second optical element 32 in the second direction (to the left in the plane of Figure 8) by an angle α of refraction. In other words, the refraction effect of the first optical element 20 is canceled out by the refraction effect of the second optical element 32, and the optical axis Ax2 becomes aligned with the optical axis Ax1. That is, light is emitted from the second optical element 32 in a direction aligned with the optical axis Ax1 toward the outside of the lighting fixture 1.

[0070] Furthermore, when the first rotation control unit 41 is operated so that the angular difference between the first direction and the second direction becomes smaller, the optical axis Ax2 of the light emitted from the second optical element 32 to the outside of the lighting fixture 1 moves linearly away from the optical axis Ax1 along the radial direction of a circle centered on the optical axis Ax1.

[0071] In other words, by operating the first rotary control unit 41, the optical axis Ax2 of the light emitted to the outside of the lighting fixture 1 can be changed linearly without changing the angle of the light source 10.

[0072] Next, we will explain the operation of the lighting fixture 1 when the second rotary operation unit 42 is operated.

[0073] As described above, with the second rotating operation unit 42 held by the cover body 50a, the second rotating operation unit 42, the light source 10, the first optical element 20, and the second optical element 32 held by the second rotating operation unit 42 can rotate integrally with respect to the cover body 50a.

[0074] In other words, by operating at least a part of the second rotation operation unit 42, the second rotation operation unit 42 and the light source 10, first optical element 20, and second optical element 32 held by the second rotation operation unit 42 can be rotated integrally with respect to the cover body 50a. This makes it possible to change the optical axis Ax2 along the circumferential direction of a circle centered on the optical axis Ax1 without changing the angle of the light source 10. In other words, without changing the angle of the light source 10, the direction of light emission to the outside of the lighting fixture 1 can be changed along the circumferential direction of a circle centered on the optical axis Ax1. Alternatively, the second rotation operation unit 42 may be operated indirectly by operating the part of the first rotation operation unit 41 that is mechanically connected to the second rotation operation unit 42 (for example, the first support column 414 that protrudes outward from the first holding unit 421).

[0075] (4) Variations The above embodiments are merely one of many embodiments of this disclosure. The above embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure are achieved. The following lists some modifications of the above embodiments. The modifications described below can be combined and applied as appropriate. Furthermore, the basic configuration of the lighting fixture 1 of the modifications described below is the same as the basic configuration of the lighting fixture 1 according to the embodiment. Therefore, components that are common to the basic configuration of the lighting fixture 1 according to the embodiment and components that are substantially common are denoted by the same reference numerals, and their illustration and description are omitted as appropriate. In the following description, "substantially common components" means components that have some differences in shape, size, etc., but have the same function.

[0076] (4.1) Variation 1 In the above embodiment, the first optical element 20 is formed in a shape that is rotationally asymmetric with respect to the optical axis Ax1 so as to refract the incident light by a refraction angle α from the direction of incidence.

[0077] On the other hand, in this modified example, the lighting fixture 1 is equipped with a first optical element 20A instead of the first optical element 20. The configuration of the first optical element 20A that is common to the first optical element 20 will not be explained.

[0078] As shown in Figure 9, the first optical element 20A is formed in a rotationally symmetric shape with respect to the axis of symmetry Ax3. This facilitates the manufacturing of the first optical element 20A.

[0079] The first optical element 20A is configured to refract incident light by a refraction angle α from the direction of incidence, by offsetting its symmetry axis Ax3 from its optical axis Ax1. In other words, the symmetry axis Ax3 of the first optical element 20A does not coincide with the optical axis Ax1. The first optical element 20A is configured to be rotatable about the optical axis Ax1. That is, the rotation axis of the first optical element 20A coincides with the optical axis Ax1. This simplifies the rotation mechanism of the first optical element 20A.

[0080] (4.2) Modification 2 In the above embodiment, the position operation unit 50 is configured to move the first optical element 20 in the vertical direction along the optical axis Ax1. However, the position operation unit 50 may also be configured to move the first optical element 20 and the second optical element 32 together in the vertical direction along the optical axis Ax1.

[0081] (4.3) Modification example 3 In the above embodiment, the second optical element 32 is configured such that a plurality of protrusions 300 protrude upward from the upper surface of the base portion 303, but it may also be configured such that a plurality of protrusions 300 protrude downward from the lower surface of the base portion 303. Alternatively, the second optical element 32 may be configured such that a plurality of protrusions 300 protrude upward from the upper surface of the base portion 303, and a plurality of protrusions 300 protrude downward from the lower surface of the base portion 303.

[0082] (4.4) Modification 4 In the above embodiment, the second optical element 32 is formed such that a plurality of protrusions 300 are arranged in one direction so that the cross-sectional shape is sawtooth-shaped. However, the second optical element 32 may be a so-called triangular prism with a triangular cross-section.

[0083] (4.5) Modification 5 As shown in Figure 10, the lighting fixture 1 may further include a drive unit 60 for driving the operating unit 40. While the drive unit 60 is shown as being included in the lighting fixture 1, it is not limited to this configuration. That is, the drive unit 60 may be located in the lighting device 80, in the operating unit 40, or outside the lighting fixture 1. The drive unit 60 is, for example, a drive device such as a motor.

[0084] (4.6) Variation 6 As shown in Figure 11, the connection surface 302 may be provided with a shielding structure 304 that blocks light incident on the connection surface 302. The shielding structure 304 is, for example, a coating formed by painting the connection surface 302 with black paint. Alternatively, the shielding structure 304 may be realized by providing a shielding plate. This reduces the amount of unwanted light emitted from the lighting fixture 1 to the outside due to light incident on the connection surface 302.

[0085] (4.7) Variation 7 As shown in Figure 12, the connection surface 302 may be provided with a diffusion structure 305 that diffuses light incident on the connection surface 302. The diffusion structure 305 can be realized, for example, by applying a textured finish to the connection surface 302. Examples of textured finishes include texturing and dimple processing. This reduces the amount of unwanted light emitted from the lighting fixture 1 to the outside due to light incident on the connection surface 302.

[0086] (4.8) Variation 8 As shown in Figure 13, a diffusion structure 306 may be provided on the lower surface of the base portion 303 to diffuse the light incident on the second optical element 32. The diffusion structure 306 can be realized, for example, by applying a textured finish to the lower surface of the base portion 303. The textured finish can be, for example, a texturized finish or a dimpled finish. This reduces the amount of unwanted light emitted from the lighting fixture 1 to the outside due to the light incident on the second optical element 32.

[0087] (summary) As described above, the lighting fixture (1) of the first embodiment comprises a light source (10), a pair of optical elements (optical elements 20, 20A and 32), and an operating unit (40). The pair of optical elements (optical elements 20, 20A and 32) are arranged along the optical axis (Ax1) of the light source (10) and have a refractive action that refracts the light emitted from the light source (10). The operating unit (40) adjusts the rotation of the pair of optical elements (optical elements 20, 20A and 32), which are configured to be rotatable about a rotation axis. The pair of optical elements (optical elements 20, 20A and 32) change the direction in which they refract the light emitted from the light source (10) in response to the operation of the operating unit (40). Of the pair of optical elements (optical elements 20, 20A and optical element 32), the optical elements (20, 20A) positioned closer to the light source (10) further have a focusing function that concentrates the light emitted from the light source (10).

[0088] According to this embodiment, since the optical elements (20, 20A) of the pair of optical elements (optical elements 20, 20A and optical element 32) that are positioned closer to the light source (10) have both refraction and focusing properties, the number of optical elements that the light emitted from the light source (10) passes through can be reduced compared to the case where optical elements with refraction properties and optical elements with focusing properties are provided separately. This reduces the loss of light emitted from the light source (10). Furthermore, this makes it possible to miniaturize the lighting fixture (1).

[0089] In the second embodiment of the lighting fixture (1), the optical element (20A) has a rotationally symmetric shape about the axis of symmetry (Ax3) as in the first embodiment. The axis of symmetry (Ax3) and the optical axis (Ax1) do not coincide.

[0090] According to this embodiment, the manufacturing of the optical element (20A) becomes easier.

[0091] In the third embodiment of the lighting fixture (1), the rotation axis of the optical element (20A) and the optical axis (Ax1) coincide, as in the second embodiment.

[0092] According to this embodiment, the rotation mechanism of the optical element (20A) can be simplified.

[0093] In the fourth embodiment of the lighting fixture (1), the optical element (20) has a rotationally asymmetric shape, as in the first embodiment.

[0094] According to this embodiment, the optical element (20) can be configured to refract light incident on it by a desired angle of refraction from the direction of incidence.

[0095] In the fifth embodiment of the lighting fixture (1), in any of the first to fourth embodiments, the operating unit (40) rotates each of the pair of optical elements (optical elements 20, 20A and optical element 32) by the same amount in opposite directions around the axis of rotation.

[0096] According to this embodiment, the operation for rotating the pair of optical elements (optical elements 20, 20A and optical element 32) can be simplified.

[0097] In the sixth embodiment of the lighting fixture (1), a position operating unit (50) for moving the optical elements (20, 20A) along the optical axis (Ax1) is further provided, in any of the first to fifth embodiments.

[0098] According to this embodiment, by operating the position control unit (50), the distance between the optical elements (20, 20A) and the light source (10) can be changed, and the light distribution of the light emitted from the lighting fixture (1) to the outside can be adjusted.

[0099] In the lighting fixture (1) of the seventh embodiment, in any of the first to sixth embodiments, a pair of optical elements (optical elements 20, 20A and optical element 32) have the same refractive effect.

[0100] According to this embodiment, the optical axis (Ax2) of the light emitted from the lighting fixture (1) can be moved linearly by operating the operating unit (40). [Explanation of symbols]

[0101] 1 Lighting fixtures 10 light source 20, 20A optical elements 32 Optical Circumference 40 Control section 50 Position operation section Ax1 Optical axis Ax2 optical axis Ax3 axis of symmetry

Claims

1. Light source and A pair of optical elements arranged along the optical axis of the light source and having a refractive action that refracts light emitted from the light source, It comprises an operating unit for adjusting the rotation of the pair of optical elements that are configured to be rotatable about a rotation axis, The pair of optical elements change the direction in which they refract light in response to the operation of the control unit. Of the pair of optical elements, the optical element positioned closer to the light source further has a light-gathering function that concentrates the light. Lighting fixtures.

2. The optical element has a rotationally symmetric shape about the axis of symmetry, The axis of symmetry and the optical axis do not coincide. The lighting fixture according to claim 1.

3. The rotation axis and the optical axis coincide. The lighting fixture according to claim 2.

4. The optical element has a rotationally asymmetric shape. The lighting fixture according to claim 1.

5. The operating unit rotates each of the pair of optical elements by the same amount in opposite directions around the rotation axis. A lighting fixture according to any one of claims 1 to 4.

6. The system further includes a positioning unit for moving the optical element along the optical axis. A lighting fixture according to any one of claims 1 to 4.

7. The pair of optical elements have the same refractive effect. A lighting fixture according to any one of claims 1 to 4.

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