Luminaire

Abstract

To provide a luminaire that can suppress a frame body from rattling even when the frame body is rotated relative to a housing in adjusting light with a lens part, and can smoothly rotate the frame body.SOLUTION: A luminaire 10 comprises: a light source part 5; a housing 4 which houses the light source part 5 inside and has an opening surface 42 that light from the light source 5 passes through; a lens part 6 which has a fixed lens 61 and a movable lens 62 arranged between the light source part 5 and the opening surface 42 to let the light from the light source part 5 pass through, and rotates the movable lens 62 around a rotational axis along a center axis of the light from the light source part 5 to adjust the light; a frame body 7 which is fixed to an outer peripheral part of the movable lens 62, and is fitted to an inner peripheral surface of the housing 4 rotatably around the rotational axis along the center axis; and a ring-shaped elastic body 8 which is provided over the entire outer peripheral surface of the frame body 7, wherein a surface of the elastic body 8 opposed to the inner peripheral surface of the housing 4 is formed with a curved cross section.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lighting fixture.

Background Art

[0002] Conventionally, in a lighting fixture having a lens, there is known a lighting fixture that rotates the lens by rotating a part of the fixture body about a central axis as a rotation axis to adjust the illumination light from the lighting fixture (see, for example, Patent Document 1).

[0003] In this type of lighting fixture, for example, there is one having a structure including a lens disposed in a housing and a frame disposed between the housing and the lens. By rotating the frame with respect to the housing about the central axis of the housing as a rotation axis, the lens can be rotated. Thereby, the illumination light can be adjusted.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in order to rotate the frame with respect to the housing, it is necessary to provide a gap between the housing and the frame. However, during manufacturing, dimensional errors occur in the housing and the frame. Therefore, if the gap between the housing and the frame is too large, the lens is likely to rattle, the position of the central axis of the light from the light source and the lens is displaced, and it is difficult to obtain a desired illumination light. Further, if the frame rattles, the frame cannot rotate smoothly.

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a lighting fixture that can reduce rattling of the frame even when the frame is rotated with respect to the housing when adjusting light by the lens unit, and can rotate the frame smoothly.

Means for Solving the Problem

[0007] A lighting fixture according to one aspect of the present invention includes a light source unit, a housing that houses the light source unit therein and has an opening surface through which light from the light source unit passes, a fixed lens and a movable lens that are disposed between the light source unit and the opening surface and allow light from the light source unit to pass through, a lens unit that can adjust light by rotating the movable lens about a rotation axis along the central axis of the light from the light source unit, a frame fixed to the outer peripheral portion of the movable lens and rotatably attached to the inner peripheral surface of the housing about a rotation axis along the central axis, and a ring-shaped elastic body provided over the entire circumference of the outer peripheral surface of the frame. A surface of the elastic body facing the inner peripheral surface of the housing is formed in a cross-sectional curved shape.

Effect of the Invention

[0008] The lighting fixture according to the above aspect of the present invention has an advantage that when adjusting light by the lens unit, even if the frame is rotated with respect to the housing, rattling of the frame can be reduced and the rotation of the frame can be performed smoothly.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0010] <Embodiment> Hereinafter, the lighting fixture 10 according to the present embodiment will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic side view showing the entire lighting fixture 10 according to the present embodiment, and is a schematic side view in which a part of the end on the opening surface 42 side through which light passes (hereinafter sometimes referred to as the front end portion) is broken. FIG. 2(A) is a schematic enlarged view of the vicinity of the front end portion of the lighting fixture 10. FIG. 2(B) is an enlarged view of part A in FIG. 2(A).

[0011] The lighting fixture 10 according to the present embodiment is a spotlight attached to the installation surface 9. As shown in FIG. 1, the lighting fixture 10 includes a power supply unit 1 attached to the installation surface 9, an arm unit 2 extending from the power supply unit 1, and a fixture main body 3 attached to the arm unit 2.

[0012] As shown in FIG. 1, the lighting fixture 10 is attached to the ceiling surface as the installation surface 9. However, the lighting fixture 10 is not limited to the installation surface 9 along the horizontal plane, and may be attached to the installation surface 9 along the vertical plane. Examples of the installation surface 9 along the horizontal plane include, in addition to the ceiling surface, for example, a soffit ceiling, an eaves, a horizontal member (for example, a beam, a girder, etc.). Examples of the installation surface 9 along the vertical plane include, for example, an outer wall surface, an inner wall surface, a column, a partition, a side surface of furniture (for example, a chest of drawers, a cabinet, etc.). The installation surface 9 may be outdoors or indoors.

[0013] Hereinafter, for convenience of explanation, with reference to the lighting fixture 10, the direction in which the light emitted from the lighting fixture 10 travels is defined as the "front direction", and the opposite direction is defined as the "rear direction". Also, the direction perpendicular to the installation surface 9 is defined as the "vertical direction". These definitions of directions are only for explanation and are not intended to specify the usage mode.

[0014] In addition, in this specification, "parallel" includes not only the case where two straight lines, planes, etc. (hereinafter, straight lines, etc.) do not intersect even when extended, but also the case where the angle formed by two straight lines, etc. intersects within a range of 10° or less. Also, "orthogonal" means the case where two straight lines, etc. intersect within a range of 90° ± 10°. However, even if two straight lines, etc. do not directly intersect, if they intersect when extended, they are included in "orthogonal".

[0015] (Power supply unit 1) The power supply unit 1 is electrically connected to an external power supply and supplies power to the appliance main body 3. The power supply unit 1 is fixed to the installation surface 9. A duct rail 91 is arranged between the power supply unit 1 and the installation surface 9. However, the duct rail 91 may not be provided.

[0016] (Arm unit 2) The arm unit 2 supports the appliance main body 3 with respect to the installation surface 9. The longitudinal direction of the arm unit 2 is orthogonal to the installation surface 9. In the present embodiment, the arm unit 2 is rotatably attached to the power supply unit 1 about a rotation axis along the vertical direction. Thereby, the arm unit 2 can support the appliance main body 3 with respect to the installation surface 9 so as to be rotatable about a rotation axis orthogonal to the installation surface 9.

[0017] Note that, in the present embodiment, the arm unit 2 is a linear arm that extends straight in the vertical direction and has the appliance main body 3 connected to its lower end, but it may be a bifurcated arm with each side connected to both horizontal sides of the appliance main body 3.

[0018] (Appliance main body 3) The appliance main body 3 constitutes the main body of the lighting fixture 10. As shown in FIG. 2, the appliance main body 3 includes a housing 4, a light source unit 5, a lens unit 6, a frame body 7, and an elastic body 8. The appliance main body 3 is rotatably supported with respect to the arm unit 2 about a rotation axis parallel to the installation surface 9, and the angle with respect to the installation surface 9 can be changed.

[0019] The housing 4 constitutes the outer shell of the appliance main body 3. In the present embodiment, the housing 4 is formed in a cylindrical shape, and the front end face is the opening face 42. When looking at the inner peripheral surface of the housing 4 along the front-rear direction, the inner peripheral surface is formed in a circular shape.

[0020] The housing 4 has a partition plate 41 formed along a plane orthogonal to the front-rear direction in the middle portion in the front-rear direction. The partition plate 41 according to the present embodiment is disposed at a position about one-third of the total length in the front-rear direction, advancing from the front end toward the rear as the middle portion. A light source unit 5 is attached to the partition plate 41.

[0021] There is no particular limitation on the material of the housing 4, and examples thereof include metal, synthetic resin, carbon, glass, and the like.

[0022] The light source unit 5 receives power supply and emits light. The light source unit 5 includes a substrate 51 and one or more LED light-emitting elements 52 mounted on the substrate 51. The substrate 51 is attached to the partition plate 41. However, as the light source unit 5, for example, an HID lamp, a halogen lamp, an incandescent lamp, or the like may be used.

[0023] The central axis of the light emitted from the light source unit 5 (hereinafter sometimes referred to as "the central axis C1 of the light source unit 5") is parallel to the front-rear direction. The central axis C1 of the light source unit 5 means a virtual straight line passing through the center of gravity when the light emitted from the light source unit 5 is projected onto a virtual plane orthogonal to the front-rear direction. When one LED light-emitting element 52 is disposed on the central axis of the housing 4, the optical axis of the LED light-emitting element 52 coincides with the central axis C1 of the light source unit 5. However, when a plurality of LED elements are disposed on a circle centered on the central axis of the housing 4, a virtual straight line passing through a point having an equal distance from the optical axes of each of the plurality of LED light-emitting elements 52 can be the central axis of the light source unit 5.

[0024] The lens unit 6 enables adjustment of the light emitted from the light source unit 5. The adjustment of the light as used herein has a function of adjusting at least one of the light distribution angle (lighting range), the direction of the light, the brightness, and the focus. The lens unit 6 has a fixed lens 61 and a movable lens 62 that moves relative to the fixed lens 61. In the present embodiment, by moving the movable lens 62 relative to the fixed lens 61, the lens unit 6 can adjust the light distribution angle of the light from the light source unit 5.

[0025] The fixed lens 61 is fixed to the housing 4 so as not to move in the circumferential direction around the central axis of the light source unit 5. The fixed lens 61 is restricted from rotating in the circumferential direction around the central axis of the light source unit 5, for example, by hitting a part of the inner surface of the housing 4.

[0026] The rear surface of the fixed lens 61 faces the light source unit 5. The fixed lens 61 is fixed to the housing 4 while being spaced apart from the light source unit 5. The front surface of the fixed lens 61 faces the movable lens 62. A convex portion 611 that protrudes forward from the outer peripheral portion is formed on the front surface of the fixed lens 61. The movable lens 62 is rotatably connected to the fixed lens 61 by fitting into the convex portion 611.

[0027] The movable lens 62 is rotatably attached to the fixed lens 61 about a rotation axis passing through the center of the fixed lens 61. That is, the movable lens 62 can rotate about the central axis C1 of the light source unit 5 as the rotation axis. A concave portion 622 is formed on the rear surface of the movable lens 62, and the convex portion 611 of the fixed lens 61 fits into the concave portion 622, and the rotation about the central axis C1 of the light source unit 5 is guided.

[0028] Due to the rotation of the movable lens 62, the positional relationship of the movable lens 62 with respect to the fixed lens 61 in the plane orthogonal to the central axis C1 of the light source unit 5 changes, but the positional relationship in the front-rear direction remains unchanged. That is, even if the lens unit 6 adjusts light, the length in the direction along the central axis C1 of the light source unit 5 does not change, so space can be reduced, and it is easy to reduce the size of the lighting fixture 10.

[0029] The lens unit 6 is formed in a circular shape when viewed along the front-rear direction. The lens unit 6 is attached so as to close the inside of the housing 4 at a position slightly rearward from the opening surface 42 of the housing 4. The lens unit 6 is attached to the housing 4 by a frame body 7.

[0030] The frame body 7 is fixed to the outer peripheral portion of the movable lens 62 and is rotatably attached to the inner peripheral surface of the housing 4 about a rotation axis along the central axis C1 of the light source unit 5. The frame body 7 is formed in a ring shape, and the movable lens 62 is fitted and fixed to its inner peripheral surface. As shown in Fig. 2(B), the frame body 7 includes a locking portion 71 that restricts the movement of the housing 4 in the central axis direction of the light source unit 5, and a holding groove 72 that holds the elastic body 8. Further, as shown in Fig. 2(A), a finger hook portion 73 is formed on the frame body 7. By hanging a finger on the finger hook portion 73, the user can easily rotate the frame body 7 with respect to the housing 4.

[0031] In this embodiment, the locking portion 71 protrudes radially from the frame body. The locking portion 71 fits into a locking groove 43 formed on the inner peripheral surface of the housing 4. The locking portion 71 restricts the movement of the housing 4 in the direction along the central axis C1 of the light source unit 5, but allows the movement in the circumferential direction around the central axis C1. A gap is formed between the tip surface of the locking portion 71 and the bottom surface of the locking groove 43.

[0032] The elastic body 8 fits into the holding groove 72. The holding groove 72 is continuously formed over the outer peripheral surface of the frame body. The holding groove 72 is formed in a substantially arc-shaped cross section, but may be, for example, a substantially U-shaped cross section, a substantially rectangular cross section, etc.

[0033] There is no particular limitation on the material of the frame body 7, and examples thereof include metal, synthetic resin, carbon, glass, etc.

[0034] The elastic body 8 is made of a material that can be elastically deformed. The elastic body 8 has a lower elastic modulus than at least the frame body 7 and is more easily deformed than the frame body 7. Examples of the elastic body 8 include rubber, soft resin, etc. As the elastic body 8, a resin or rubber containing silicone is preferably used. 。

[0035] The elastic body 8 is formed over the entire outer peripheral surface of the frame body 7. The elastic body 8 may be formed in a ring shape, or a string-like elastic body 8 having both ends in the longitudinal direction may be fitted into the holding groove 72 to be formed over the entire outer peripheral surface of the frame body 7.

[0036] The elastic body 8 is preferably formed in a circular cross-sectional shape. The elastic body 8 according to the present embodiment is an O-ring 81. However, the elastic body 8 may be formed in a substantially D-shaped cross-section. In this case, the elastic body 8 is arranged such that the surface facing the frame body 7 is flat and the surface facing the inner peripheral surface of the housing 4 is a curved surface. That is, the surface of the elastic body 8 facing the inner peripheral surface of the housing 4 only needs to be formed in at least a cross-sectional curved shape.

[0037] The outer peripheral surface of the frame body 7 and the holding groove 72 are formed to have a diameter such that the elastic body 8 is not crushed and adhered to the inner peripheral surface of the housing 4. The elastic body 8 elastically contacts the inner peripheral surface of the housing 4 without adhering thereto, so that even if the center of the lens portion 6 is temporarily displaced, the center of the lens portion 6 can be returned to approach the central axis of the light source portion 5. That is, the center of the lens portion 6 can be brought as close as possible to the central axis of the light source portion 5. Moreover, since the outer peripheral surface of the elastic body 8 is formed in a cross-sectional curved shape, the contact area can be reduced as long as it is not crushed and adhered, so that when the frame body 7 is rotated, the elastic body 8 can slide in the circumferential direction around the central axis of the light source portion 5 with respect to the inner peripheral surface of the housing 4. As a result, according to the lighting fixture 10 according to the present embodiment, when the frame body 7 is rotated with respect to the housing 4, the rotation of the frame body 7 can be smoothly performed while positioning the lens portion 6 at the center.

[0038] In addition, by slightly deforming the elastic body 8 with respect to the inner peripheral surface of the housing 4, a slight resistance force against the rotation of the frame body 7 can be generated. As a result, it is easy to finely adjust the lens portion 6, and the positional relationship between the adjusted frame body 7 and the housing 4 can be maintained, and the adjusted state can be easily maintained.

[0039] Note that the elastic body 8 according to this embodiment is an O-ring 81, which is generally used to ensure watertightness. However, since the elastic body 8 according to this embodiment is not crushed and adhered to the inner peripheral surface of the housing 4, watertightness by the elastic body 8 cannot be obtained. That is, in this specification, "the elastic body 8 is in slidable contact with the inner peripheral surface of the housing 4 in the circumferential direction around the central axis" means that the elastic body 8 is slightly deformed with respect to the inner peripheral surface of the housing 4, but is not crushed and adhered, and is in contact in a manner that it can move while rubbing.

[0040] <Modification example> The above embodiment is only one of various embodiments of the present invention. The embodiment can be variously modified according to the design and the like as long as the object of the present invention can be achieved. Hereinafter, modification examples of the embodiment will be listed. The modification examples described below can be applied in appropriate combinations.

[0041] The lighting fixture 10 according to the above embodiment is a spotlight, but for example, it may be a downlight or a portable spotlight or the like.

[0042] In the above embodiment, the housing 4 is cylindrical, but as long as the inner peripheral surface of the front end portion of the housing 4 is circular, the outer shape is not limited to a circle and is not particularly limited.

[0043] In the above embodiment, the lens unit 6 is configured such that the length in the direction along the central axis C1 of the light source unit 5 does not change when adjusting the light. However, the movable lens 62 may move spirally with respect to the fixed lens 61 and also move in the direction along the central axis C1 of the light source unit 5. Also, the movable lens 62 and the fixed lens 61 may be in reverse front and rear positions. In that case, the frame body 7 and the elastic body 8 are also arranged together with the movable lens 62 at a position closer to the light source unit 5 than the fixed lens 61.

[0044] In the above embodiment, the locking portion 71 is a protrusion protruding radially from the frame body main body, but the locking portion 71 may be a concave groove. When the locking portion 71 is a concave groove, a protrusion that fits into the concave groove is formed on the inner peripheral surface of the housing 4.

[0045] <Summary> As described above, the lighting fixture 10 according to the first aspect includes a light source unit 5, a housing 4 that houses the light source unit 5 therein and has an opening surface 42 through which light from the light source unit 5 passes, a lens unit 6 disposed between the light source unit 5 and the opening surface 42, a frame body 7 provided on the outer peripheral portion of the lens unit 6, and a ring-shaped elastic body 8 provided over the entire circumference of the outer peripheral surface of the frame body 7. The lens unit 6 has a fixed lens 61 and a movable lens 62 that allow light from the light source unit 5 to pass therethrough, and is configured such that the movable lens 62 can rotate about a rotation axis along the central axis of the light from the light source unit 5 to adjust the light. The frame body 7 is fixed to the outer peripheral portion of the movable lens 62 and is rotatably attached to the inner peripheral surface of the housing 4 about a rotation axis along the central axis. The surface of the elastic body 8 facing the inner peripheral surface of the housing 4 is formed in a cross-sectional curved surface shape.

[0046] According to this aspect, since the elastic body 8 is provided over the entire circumference of the outer peripheral portion of the frame body 7, it is possible to reduce the rattling of the frame body 7 with respect to the inner peripheral surface of the housing 4. Moreover, since the surface of the elastic body 8 facing the inner peripheral surface of the housing 4 is formed in a cross-sectional curved surface shape, the contact area with respect to the inner peripheral surface of the housing 4 can be made as small as possible. As a result, when adjusting the light by the lens unit 6, even if the frame body 7 is rotated with respect to the housing 4, it is possible to reduce the rattling of the frame body 7 and smoothly rotate the frame body 7.

[0047] In the lighting fixture 10 according to the second aspect, in the first aspect, the elastic body 8 is formed in a cross-sectional circular shape. According to this aspect, even if a part of the elastic body 8 is twisted during assembly, the surface of the elastic body 8 facing the inner peripheral surface of the housing 4 can be made into a cross-sectional circular shape, and the smoothness of the rotation of the frame body 7 can be ensured.

[0048] In the lighting fixture 10 according to the third aspect, in the first or second aspect, the elastic body 8 contains silicone. According to this aspect, the frictional force between the elastic body 8 and the inner peripheral surface of the housing 4 can be suppressed, and the sliding of the elastic body 8 with respect to the inner peripheral surface of the housing 4 can be improved.

[0049] In the lighting fixture 10 according to the fourth aspect, in any one of the first to third aspects, the elastic body 8 is in slidable contact with the inner peripheral surface of the housing 4 in the circumferential direction around the central axis C1. According to this aspect, since the elastic body 8 contacts the inner peripheral surface of the housing 4 in such a manner that it slightly deforms but can move while rubbing without being crushed and adhered, it is possible to further suppress rattling of the frame body 7 and obtain smooth rotation of the frame body 7.

Explanation of Reference Numerals

[0050] 10 Lighting fixture 4 Housing 42 Opening surface 5 Light source unit 6 Lens unit 61 Fixed lens 62 Movable lens 7 Frame body 8 Elastic body C1 Central axis of the light source unit

Claims

1. A light source unit; a housing that houses the light source unit therein and has an opening through which light from the light source unit passes; a lens unit that is disposed between the light source unit and the opening surface, has a fixed lens and a movable lens that transmit light from the light source unit, and is capable of adjusting light by rotating the movable lens on a rotation axis along a central axis of the light from the light source unit; a frame body fixed to an outer periphery of the movable lens and rotatably attached to an inner periphery of the housing about a rotation axis along the central axis; a ring-shaped elastic body provided around the entire outer periphery of the frame body; Equipped with The elastic body has a surface facing the inner circumferential surface of the housing, the surface being formed into a curved cross section. Lighting fixtures.

2. The elastic body is formed to have a circular cross section.

2. A lighting fixture according to claim 1.

3. The elastic body includes silicone.

3. A lighting device according to claim 1 or 2.

4. The elastic body is in contact with an inner peripheral surface of the housing so as to be slidable in a circumferential direction around the central axis.

3. A lighting device according to claim 1 or 2.

Images