JP2020077602A - Lighting device - Google Patents

Abstract

To provide a lighting device which can achieve good narrow angle characteristics and inhibit a center part of a radiation area from being darkened easily.SOLUTION: A lighting device 1 includes: a housing 10; a light source 22 fixed to an interior of the housing 10; a fixed lens 40 fixed to the interior of the housing 10 and having a light emission part 88 located closer to the light emission side as seen in a Z direction than the light source 22; and a movable lens 60 which has a projection part 87 disposed closer to the light emission side as seen in the Z direction than the fixed lens 40 and enables a distance between itself and the light source 22 to vary in an optical axis direction. The movable lens 60 may have one or more annular fresnel part 68 at the outer periphery side. Further, it is preferable that the fixed lens 40 be more excellent than the movable lens 60 in heat resistance.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a lighting device.

  BACKGROUND ART Conventionally, as a lighting device, there is one described in Patent Document 1. This lighting device includes a base, a light source module, a first cylindrical member, a second cylindrical member, a lens holder, and a lens. The base constitutes the upper side of the housing and has a plurality of fins on the side opposite to the light emitting side. The light source module is fixed to the end surface (main surface) on the light emitting side of the base and emits light to the side opposite to the fin side in the optical axis direction. The first cylindrical member is fixed to the base so as not to move relative to it. Further, the second cylindrical member is attached to the first cylindrical member so as to be relatively movable in the optical axis direction, and when rotated with respect to the first cylindrical member, the height position with respect to the first cylindrical member changes. The lens holder constitutes the lower side of the housing of the lighting device and is fixed to the outside of the second cylindrical member in the radial direction so as not to be movable relative to each other. Further, the lens is fixed inside the lens holder so as not to move relative to it. The lens is located on the light emission side of the light source module in the optical axis direction. In this illumination device, the height position of the lens holder with respect to the base can be changed by rotating the lens holder with respect to the base, and the position of the lens in the optical axis direction with respect to the light source module can be appropriately adjusted. Therefore, the grazing angle performance of the emitted light can be adjusted, the degree of freedom in light distribution control can be increased, and desired dimming can be easily realized.

Japanese Patent No. 6159460

  In the above illumination device, when an attempt is made to improve narrow-angle characteristics (characteristics of narrowing the light distribution area at a position where the lens is away from the light source), there is a drop in the irradiation light (a phenomenon in which the central part of the irradiation area becomes dark). It tends to occur in a wide range of positions of the lens in the optical axis direction. On the other hand, if it is attempted to suppress the occurrence of the center drop of the lens, the narrow angle characteristics are likely to deteriorate.

  Therefore, an object of the present disclosure is to provide an illuminating device that easily realizes both good narrow-angle characteristics and suppression of a middle drop.

  In order to solve the above problems, an illumination device according to the present disclosure includes a housing, a light source fixed in the housing, and a light emitting unit fixed in the housing and located on the light emitting side in the optical axis direction with respect to the light source. And a movable lens having a light projecting portion arranged on the light emission side in the optical axis direction with respect to the fixed lens and having a variable distance in the optical axis direction from the light source.

  According to the illuminating device according to the present disclosure, it is easy to achieve both good narrow-angle characteristics and suppression of middle drop.

It is a perspective view of the principal part of the illuminating device concerning one embodiment of this indication. It is a disassembled perspective view of the principal part of an illuminating device. It is sectional drawing in the cut surface containing the central axis of the said main part. It is a perspective view when the fixed lens assembly attached to the case of an illuminating device is seen from the lower side. It is a perspective view of a fixed lens. It is a perspective view of a lens attachment member. It is a perspective view of a fixed lens assembly. It is the perspective view which looked at the fixed lens assembly which removed the lens attachment member from the bottom. It is the perspective view which looked at the fixed lens assembly which removed the fixed lens from the state shown in Drawing 8 from the bottom. It is the perspective view which looked at the fixed lens assembly which removed the light source module from the top. It is the perspective view which looked at the substrate holder holding the light source module from above. FIG. 6 is a perspective view of an optical block including a lens holder and a movable lens held by the lens holder. It is a perspective view of a lens holder. It is a perspective view of a moving lens. It is a perspective view of a rotating member. It is a perspective view of a rotating member assembly. It is a schematic cross section of an illuminating device, and is a schematic cross section for explaining emitted light control of a fixed lens. The optical efficiency of each of the illuminating device of the reference example having only one moving lens and the illuminating device of one embodiment having the fixed lens and the moving lens (two lenses) and the position of the moving lens in the optical axis direction. It is a figure explaining a relation. It is a figure explaining the relationship of the position of a moving lens and light distribution in the illuminating device of the reference example which has only one moving lens. It is a figure explaining the relationship of the position of a moving lens and the light distribution in the illuminating device of one Example which has a fixed lens and a moving lens (two lenses). It is a schematic cross section for explaining the temperature of each part of an illuminating device when a movable lens exists in a position away from a light source. It is a schematic cross section for explaining the temperature of each part of an illuminating device when a moving lens is located near a light source. It is a schematic diagram showing an example of a positional relationship of a light source, a fixed lens, and a moving lens in the state in which the moving lens is arrange | positioned in the most distant position from the light source. FIG. 9 is a schematic diagram illustrating light distribution control by the moving lens when ambient light emitted from the fixed lens is incident on the outer edge portion of the light incident surface of the moving lens arranged at a narrow angle position. It is a figure showing the advancing direction of the light in a middle angle position in the illuminating device which does not have a fixed lens but has only a moving lens in comparison with an illuminating device. FIG. 24 is a schematic diagram corresponding to FIG. 23 in a state where the movable lens is arranged at the wide-angle position closest to the light source.

  Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. When a plurality of embodiments and modifications are included below, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the characteristic parts. Further, in the following embodiments, the same reference numerals are given to the same components in the drawings, and duplicated description will be omitted. Further, in the following embodiments, the dimensional ratios such as the length, the width, and the height of each member do not necessarily match between different drawings. Further, in the following description and drawings, the R direction indicates the radial direction of the lens body 41 described below, and the θ direction indicates the circumferential direction of the lens body 41. Further, the Z direction indicates the height direction of the lighting device 1, matches the thickness direction of the substrate 21 of the light source module 20 described later, and also matches the optical axis direction. The R direction, the θ direction, and the Z direction are orthogonal to each other. Further, in the following description, the central axis indicates a straight line including the central axis of the lens body 41.

  Further, in the following description, the case where the Z direction coincides with the optical axis direction of the light emitted from the light source of the lighting device will be described. However, the Z direction does not have to coincide with the optical axis direction emitted from the light source of the illumination device. Further, in the following description, when the words related to the vertical direction and the horizontal direction, for example, the lower side, the upper side, the horizontal direction, etc. are used, those words indicate that the light emitted from the lighting device is irradiated downward in the vertical direction. The optical axis of the emitted light is represented in the vertical direction. In other words, in this embodiment, the case where the lighting device is arranged so that the Z direction coincides with the vertical direction will be described as an example. Supplementally, the illuminating device of the present disclosure may be a universal type illuminating device capable of adjusting the inclination angle of the emitted light with respect to the vertical direction in the optical axis direction, but in that case, the wording related to the vertical direction or the horizontal direction is the emitted light. It is expressed in a state where the optical axis direction of is aligned with the vertical direction. Further, in the present specification, the lower side refers to the light projecting side in the Z direction, and the upper side refers to the side opposite to the light projecting side in the Z direction. Further, in this specification, the word "abbreviation" is used in the same meaning as the word "roughly speaking", and the requirement of "abbreviation" is satisfied if a person looks like that. Further, in the following description, the lens effective diameter is defined as the maximum diameter of the area through which the light ray passes on the surface through which the light ray passes in the lens. The effective lens diameter may be defined as the diameter of a bundle of parallel rays that exits an object point at infinity on the optical axis of the lens and passes through the lens. In some cases, light may be incident on a protruding portion such as a lens holding portion, but the protruding portion is not included in the effective diameter. Further, among the components described below, the components not described in the independent claim indicating the highest concept are arbitrary components and are not essential components.

  FIG. 1 is a perspective view of a main part of a lighting device 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the lighting device 1 is an embedded downlight, which is embedded in a ceiling of a building such as a hall and illuminates the lower side. The lighting device 1 includes a housing 10 having a bottomed cylindrical portion 11. The bottomed cylindrical portion 11 functions as a mounting base when mounting the light source 22 (see FIG. 9) in the housing 10. The housing 10 has a plurality of fins 12 protruding upward. The entire housing plays a role of dissipating the heat generated by the light source 22, and particularly the fin 12 radiates the heat from the light source 22 to the outside air. Therefore, the housing 10 is preferably made of a material having a high thermal conductivity such as a metal material. The housing 10 is formed by integrally molding the bottomed cylindrical portion 11 and the fins 12 by, for example, aluminum die casting. The housing may have a structure in which the bottomed cylindrical portion and the fin are joined together. In this case, for example, the protrusion provided on the bottomed cylindrical portion may be inserted into the hole provided on the fin and then plastically deformed to connect the bottomed cylindrical portion to the fin. Note that the housing may not have fins. Moreover, the housing may be made of a metal material other than aluminum, or may be made of a resin material such as polybutylene terephthalate.

  Although not described in detail, for example, two mounting springs (not shown) are mounted on the outer peripheral surface of the cylinder of the housing. The two mounting springs are, for example, arranged outside the frame so as to face each other in the radial direction (matching the R direction) with the central axis interposed therebetween, and are fixed to the cylindrical outer peripheral surface of the frame with bolts or the like. Each mounting spring extends substantially horizontally, for example, in a state before being fixed to the embedded hole in the ceiling where no external force acts. The mounting spring is composed of, for example, a long metal plate and has a leaf spring structure. The mounting spring is distorted so that the mounting spring extends in the vertical direction, and the mounting spring abuts around the embedded hole. The illuminating device 1 is fixed to the inner surface of the embedding hole in the ceiling by the horizontal force received by the mounting spring from the inner surface of the embedding hole. Note that three or more mounting springs may be provided. The mounting structure for mounting the lighting device on the ceiling may be any structure as long as the lighting device can be fixed to the ceiling, and may not include the mounting spring.

  FIG. 2 is an exploded perspective view of a main part of the lighting device 1, and FIG. 3 is a cross-sectional view of a cutting plane including a central axis of the main part. As shown in FIG. 2, the lighting device 1 includes a housing 10, a light source module 20, a substrate holder 30, a fixed lens 40, a holder fixing member 42, a lens mounting member 45, a moving lens 60, an annular lens holder 70, and an annular shape. The rotary member 80 of FIG. The substrate holder 30 holds the substrate 21 of the light source module 20, and the holder fixing member 42 is used when fixing the substrate holder 30 to the upper end surface (main surface) inside the housing. The lens attachment member 45 is used to attach the fixed lens 40 arranged below the substrate 21 to the substrate holder 30, and the lens holder 70 holds the moving lens 60. Further, the rotating member 80 plays a role of moving the lens holder 70 in the optical axis direction with respect to the housing 10.

  As shown in FIG. 3, the fixed lens 40 is arranged below the light source module 20, and the movable lens 60 is arranged below the fixed lens 40. To be more precise, the light emitting portion (end surface on the light emitting side in the Z direction) 88 of the fixed lens 40 is arranged on the light emitting side in the Z direction (lower side in the Z direction) with respect to the light source module 20, and the movable lens 60 of the movable lens 60 is disposed. The light projecting portion (end surface on the light emitting side in the Z direction) 87 is arranged on the light emitting side in the Z direction (lower side in the Z direction) than the fixed lens 40. The lens holder 70 is arranged on the outer diameter side of the moving lens 60 so as to surround the moving lens 60, and the rotating member 80 is arranged on the outer diameter side of the lens holder 70 so as to surround the lens holder 70.

  FIG. 4 is a perspective view of the fixed lens assembly 90 attached to the housing 10 as viewed from below. The light source module (see FIG. 3) 20, the substrate holder 30, the fixed lens 40, the holder fixing member 42, and the lens mounting member 45 are integrated and integrated. Fixed lens assembly 90 includes its integrated structure. Below, the structure of the fixed lens assembly 90 will be described first, and the fixing structure of the fixed lens assembly 90 to the housing 10 will also be described.

  FIG. 5 is a perspective view of the fixed lens 40, and FIG. 6 is a perspective view of the lens mounting member 45. Further, FIG. 7 is a perspective view of the fixed lens assembly 90. As shown in FIG. 5, the fixed lens 40 has a lens body 41 and two lens fixing portions 57. The fixed lens 40 is made of a translucent material having translucency. The fixed lens 40 is preferably formed of a transparent resin material such as acrylic, polycarbonate, or silicone, or a glass material, and more preferably formed of a translucent material having high heat resistance, for example, a silicone material or glass. The lens body 41 has a conical outer peripheral surface 63, and the extending direction of the central axis of the conical outer peripheral surface 63 is substantially coincident with the Z direction. Further, the lens body 41 has a recess 46 that opens upward in the Z direction, and the recess 46 has a central axis that substantially coincides with the central axis of the conical outer peripheral surface 63. The side surface of the recess 46 can be configured by, for example, a cylindrical inner peripheral surface 48. The two lens fixing portions 57 are arranged to face each other in the R direction so as to sandwich the central axis of the lens body 41, and each lens fixing portion 57 extends outward from the conical outer peripheral surface 63 in the R direction. The lens fixing portion 57 has recesses 47 which are open on both sides in the R direction and in the Z direction on the outer side in the R direction.

  As shown in FIG. 6, the lens mounting member 45 has a plane-symmetrical structure and includes a ring portion 50, two lens locking portions 51, and two holder locking portions 52. The lens locking portion 51 has a recessed portion 59 that projects radially outward from the ring 50 and that is open on both sides in the R direction and on the upper side in the Z direction. Further, the holder locking portion 52 projects outward in the R direction from the end surface of the lens locking portion 51 on the outer side in the R direction. The length a of the recess 59 in the orthogonal direction orthogonal to both the R direction and the Z direction is the length b in the orthogonal direction orthogonal to both the R direction and the Z direction at the tip of the lens fixing portion 57 (see FIG. 5). Greater than

  As shown in FIG. 7, the tip of the lens fixing portion 57 is placed on the bottom surface 53 of the recess 59. In addition, the substrate holder 30 includes a protruding portion 31 protruding downward, and the protruding portion 31 has three columnar portions 32 arranged at intervals from each other on the tip side. The length in the orthogonal direction from one end of the columnar portion 32 on one side to the other end of the columnar portion 32 on the other side is the same as the above a or slightly smaller than a. Further, the length of the central columnar portion 32 in the orthogonal direction is the same as or slightly smaller than the length c (see FIG. 5) of the recess 47 in the orthogonal direction. The central columnar portion 32 passes through the recess 47, and its tip end surface contacts the bottom surface 53.

  Again referring to FIG. 6, the holder locking portion 52 has a through hole 56, a pair of columnar portions 54a and 54b arranged on both sides of the through hole 56 in the orthogonal direction, and an outside of the through hole 56 in the R direction. It has a locking end surface 55 facing downward in the Z direction. Further, as shown in FIG. 7, the substrate holder 30 has a locking portion 34 extending downward. It is assumed that the central columnar portion 32 is passed through the concave portion 47 and then the tip end surface thereof is brought into contact with the bottom surface 53. Then, at the same time as the contact, the locking portion 34 of the substrate holder 30 is housed in the through hole 56 (see FIG. 6) while being positioned by the pair of columnar portions 54a and 54b, and the locking claw 34a of the locking portion 34 is held. Are locked to the locking end surface 55. As a result, the substrate holder 30, the fixed lens 40, and the lens mounting member 45 are integrated together. As shown in FIG. 4, in the state in which the integrated structure is configured, the ring portion 50 of the lens mounting member 45 is located outward of the lens body 41 in the R direction.

  Next, the holding of the light source module 20 in the fixed lens assembly 90 and the fixing of the fixed lens assembly 90 to the housing 10 will be described. 8 is a perspective view of the fixed lens assembly 90 from which the lens mounting member 45 (see FIG. 6) is removed, as viewed from below, and FIG. 9 is a fixed lens assembly obtained by further removing the fixed lens 40 from the state shown in FIG. It is the perspective view which looked at 90 from the bottom. 10 is a perspective view of the fixed lens assembly 90 from which the light source module 20 (see FIG. 9) is removed, viewed from above, and FIG. 11 is a perspective view of the substrate holder 30 holding the light source module 20 from above. It is a figure.

  When the fixed lens 40 is removed from the fixed lens assembly 90 shown in FIG. 8, the light source 22 is exposed to the outside as shown in FIG. With reference to FIG. 9, the light source module 20 has a substrate 21 and a light source 22. The board 21 has a substantially rectangular shape in a plan view, and the light source 22 has a disk shape, and is arranged substantially at the center of the lower surface (mounting surface) of the board 21. The light source module 20 has, for example, a COB (Chip On Board) structure, and the light source 22 includes a plurality of LEDs (light emitting diodes) mounted on the substrate 21 and a sealing member that seals the plurality of LEDs. ..

  The substrate 21 is composed of, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like. Although not described in detail, a pair of electrode terminals and a metal wiring having a predetermined pattern are formed on the substrate 21. The pair of electrode terminals are provided to receive DC power for causing the LED to emit light from the outside. Further, the metal wiring having a predetermined pattern is provided to electrically connect the LEDs to each other.

  The LED is an example of a light emitting element. The LED is, for example, a bare chip that emits visible light of a single color, and a blue LED chip that emits blue light when energized. The plurality of LEDs are arranged in a matrix on the substrate 21, for example. Note that only one LED may be mounted on the board. The sealing member is made of, for example, a translucent resin and contains a phosphor. The phosphor plays a role of converting the wavelength of the light from the LED. The sealing member is made of, for example, a phosphor-containing resin in which phosphor particles are dispersed in a silicone resin. When the light source module 20 emits white light and the LED is a blue LED chip that emits blue light, the phosphor particles are composed of, for example, a YAG-based yellow phosphor.

  The sealing member may be, for example, all LEDs may be collectively encapsulated, a plurality of LEDs may be linearly encapsulated in each row, or each LED may be individually encapsulated. Good. Further, the light source may include a light emitting element other than the LED, a semiconductor laser element, a solid state light emitting element such as an organic EL (Electro Luminescence) element or an inorganic EL element, and the like. Alternatively, the light source may be an incandescent lamp or a fluorescent lamp.

  As shown in FIG. 9, the two holder fixing members 42 are arranged below the substrate holder 30 at intervals in the longitudinal direction of the substrate holder 30. The holder fixing member 42 has a mounting hole 43, and the mounting hole 43 overlaps with the mounting hole 39 (see FIG. 10) of the substrate holder 30 when viewed from the Z direction, and the main surface 18 (see FIG. 4), and also overlaps with a screw hole (not shown) provided in the same. As shown in FIG. 10, the substrate holder 30 has a through hole 37 that is substantially rectangular in a plan view. When the holder fixing member 42 is arranged at a predetermined position with respect to the substrate holder 30, the substrate receiving portion 42a forming a part of the holder fixing member 42 overlaps the through hole 37 when viewed from the Z direction. The substrate holder 30 and the holder fixing member 42 define the substrate housing chamber 27.

  As shown in FIG. 11, the light source module 20 is housed in the substrate housing chamber 27 with the light source 22 facing downward. With the light source module 20 housed in the substrate housing chamber 27 (see FIG. 10), a part of the lower surface of the substrate 21 contacts the substrate receiving portion 42a (see FIG. 10). Furthermore, the substrate holder 30 that accommodates the substrate 21 in the substrate accommodating chamber 27 is integrated with the fixed lens 40 and the lens mounting member 45 as described above. Thereafter, bolts (not shown) were provided from below on the mounting holes 43 (FIG. 9) of the holder fixing member 42, the mounting holes 39 (see FIG. 10) of the substrate holder 30, and the main surface 18 of the housing 10. Tighten into the screw hole (not shown). By this tightening, the fixed lens assembly 90 (see FIG. 7) is fixed to the main surface 18 of the housing 10.

  As shown in FIG. 3, in the present embodiment, in the state where the fixed lens assembly 90 is fixed to the main surface 18, the Z direction position of the light emitting side tip 29 of the light source 22 is the tip of the fixed lens 40 on the substrate side. It coincides with the Z direction position at 62. It should be noted that, with the fixed lens assembly fixed to the main surface, the tip of the fixed lens on the substrate side is moved in the Z direction by a distance of 1 mm in the Z direction with respect to the tip of the light emitting side of the light source in the Z direction. It is preferable to locate it on the substrate side. Further, the Z-direction position of the front end (upper end in the Z direction) of the fixed lens on the substrate side matches the Z-direction position of the front end (lower end in the Z direction) of the light source of the light source, or the Z direction of the lower end in the Z direction of the light source. It is more preferable that the position is closer to the substrate than the position. In that case, the tip of the fixed lens on the substrate side may contact the substrate.

  Next, a structure that allows the movable lens 60 (see FIG. 2) to move in the Z direction will be described. 12 is a perspective view of an optical block 95 including a lens holder 70 and a moving lens 60 held by the lens holder 70, FIG. 13 is a perspective view of the lens holder 70, and FIG. It is a perspective view. As shown in FIG. 12, the lens holder 70 is an annular member and is arranged so as to surround the moving lens 60. The lens holder 70 is preferably formed of a metal material such as aluminum or a resin material such as polybutylene terephthalate. In addition, the movable lens 60 is made of a translucent material having translucency, and is preferably made of a transparent resin material such as acrylic, polycarbonate, or silicone, or a glass material.

  As shown in FIG. 13, the lens holder 70 has two recessed portions 71 arranged at intervals in the θ direction, and each recessed portion 71 is open on the upper side in the Z direction and on both sides in the R direction and extends in the Z direction. Exists The role of the recess 71 will be described later. Further, the lens holder 70 has three lens fitting portions 73, and the three lens fitting portions 73 are arranged on the inner peripheral side at substantially equal intervals in the θ direction. The lens fitting portion 73 is composed of a protruding portion that protrudes inward in the R direction.

  As shown in FIG. 14, the movable lens 60 has a shape that widens toward the bottom in the Z direction. The movable lens 60 has three holder fitting portions 61 arranged at substantially equal intervals in the θ direction at the lower end on the outer peripheral side. The holder fitting portion 61 has a shape corresponding to the shape of the lens fitting portion 73 (see FIG. 13), and is composed of a concave portion that is recessed inward in the R direction. By fitting the lens fitting portion 73 into the holder fitting portion 61 by press fitting, the movable lens 60 is fixed to the lens holder 70, and as a result, the optical block 95 shown in FIG. 12 is configured.

  Next, an integrated structure in which the optical block 95 can move relative to the rotating member 80 (see FIG. 2) will be described. As shown in FIG. 12, the lens holder 70 has two fitting claws 78 on the outer peripheral side. The two fitting claws 78 are arranged so as to face each other in the R direction via the central axis, and each fitting claw 78 has a plate shape and extends in a direction inclined with respect to the Z direction.

  FIG. 15 is a perspective view of the rotating member 80. As shown in FIG. 15, the rotating member 80 is a substantially cylindrical member, and has two inclined grooves 81 arranged at intervals in the θ direction. The inclined groove 81 has a shape formed of a part of a spiral groove. The inclined groove 81 is inclined with respect to the Z direction, and extends from the lower side in the Z direction of the rotating member 80 to the upper side in the Z direction as it goes to one side in the θ direction. The inclined groove 81 has a structure of a long and slender through hole that penetrates the rotating member 80 in the thickness direction, and includes a pair of inner wall surfaces (inclined surfaces) 81a and 81b facing each other in the Z direction.

  As shown in FIG. 16, the optical block 95 and the rotary member 80 are integrally integrated by fitting the fitting claw 78 protruding outward in the R direction in the optical block 95 into the inclined groove 81 of the rotary member 80. The rotary member assembly 85 is configured. The fitting claw 78 is movable in the inclined groove 81 in the extending direction of the inclined groove 81. When the optical block 95 rotates relative to the rotary member 80 in the direction indicated by θ1 from the state shown in FIG. 16, the optical block 95, and thus the movable lens 60, moves upward in the Z direction with respect to the rotary member 80. In this way, by adjusting the position where the fitting claw 78 exists in the inclined groove 81, the Z direction position of the moving lens 60 with respect to the rotating member 80 can be adjusted.

  Next, a mounting structure of the rotating member assembly 85 to the housing 10 will be described. As shown in FIG. 1, the housing 10 has a two-part structure and includes a first member 10a and a second member 10b. Further, as shown in FIG. 4, the main surface 18 of the housing 10 is provided with screw holes 13. Further, as shown in FIG. 3, the rotation preventing member 97 is fastened to the screw hole 13 and fixed to the main surface 18. The rotation stopping member 97 is a columnar member and extends in the Z direction while being fixed to the main surface 18. The tip side 97a of the rotation stopping member 97 is arranged in the recess 71 of the lens holder 70 while being fixed to the main surface 18 thereof. As a result, the range of relative rotation of the optical block 95 with respect to the housing 10 in the θ direction is limited to a predetermined circumferential area.

  As shown in FIG. 3, the housing 10 has one or more annular grooves 28 on its inner peripheral surface, and the rotating member 80 is accommodated in the annular groove 28 with a slight gap in the Z direction. It has a plurality of protrusions 89 arranged at intervals in the θ direction. The tip end side 97a of the rotation stopping member 97 is disposed in the recess 71 of the lens holder 70, and the protrusion 89 of the rotating member 80 is accommodated in the annular groove 28 of the housing 10 with a screw (not shown) as the first member. 10a (see FIG. 1) and the second member 10b are integrated. By this integration, the rotating member assembly 85 is attached to the housing 10 and integrated with the housing 10. Since there is a slight gap in the Z direction, the rotating member 80 can be smoothly rotated with respect to the housing 10. The Z-direction position of the rotating member 80 with respect to the housing 10 varies by the length of the slight gap in the Z-direction, in other words, the Z-direction position of the rotating member 80 with respect to the housing 10 does not substantially change.

  Referring again to FIG. 15, the rotating member 80 has an annular grip portion 82 on the lower side in the Z direction for a person to grip and rotate the rotating member 80. As shown in FIG. 1, in a state where the lighting device 1 is assembled, the grip portion 82 projects downward from the housing 10 in the Z direction. Therefore, a person can rotate the grip portion 82 of the rotating member 80, and can freely rotate the rotating member 80 in both directions in the θ direction with respect to the housing 10.

  In the above configuration, it is assumed that a person rotates the rotating member 80 with respect to the housing 10 using the grip portion 82. Then, since the tip end side 97a of the rotation stopping member 97 is disposed in the recess 71 of the lens holder 70 and the movement of the optical block 95 with respect to the housing 10 in the θ direction is limited to a slight range, the optical block 95 rotates. The rotating member 80 rotates relative to the optical block 95 without rotating along with the rotation of the member 80. Therefore, by this relative rotation, the fitting claw 78 moves in the inclined groove 81, and as a result, the optical block 95 relatively moves in the Z direction with respect to the rotating member 80. Therefore, as described above, even if the rotating member 80 rotates, the Z-direction position of the rotating member 80 hardly changes, so that the Z-direction position of the optical block 95 can be freely changed and is included in the optical block 95. The position of the moving lens 60 in the Z direction can also be freely changed.

  Next, control of emitted light of the fixed lens 40 will be described. With reference to FIG. 17 which is a schematic cross-sectional view of the illuminating device 1, if the fixed lens 40 does not exist, the emitted light spreads from the light source 22 to the outside in the R direction in a wider range as shown by an arrow A. easy. Then, even when the distance in the Z direction from the light source 22 is short, a larger amount of light travels outward in the R direction.

  On the other hand, when the fixed lens 40 is fixed near the light source 22 as in this embodiment, most of the light emitted from the light source 22 can be incident on the fixed lens 40. Then, the light from the light source 22 can be controlled by the fixed lens 40 in a direction in which the angle with the Z direction indicated by the arrow B becomes smaller, and can be controlled so as to travel further downward. Therefore, it is possible to suppress the light that travels outward from the light source 22 in the R direction and does not enter the moving lens 60, and it is possible to improve the optical efficiency of the illumination device 1. It is possible to make the light easy to execute the light distribution control.

  Next, these working effects will be described more objectively by showing test examples. FIG. 18 shows the optical efficiency in the illuminating device of the reference example having only one moving lens and the illuminating device of the one example having the fixed lens and the moving lens (two lenses), and the Z direction of the moving lens. It is a figure explaining the relationship with a position. As shown in FIG. 18, in one moving lens, when the moving lens moves away from the light source from a position close to the light source to a narrow-angle light distribution position, the optical efficiency sharply decreases from about 80% to about 60%. On the other hand, in the case of having the fixed lens and the movable lens, even if the movable lens is separated from the light source from the position close to the light source to the narrow-angle light distribution position, the optical efficiency is kept substantially constant and hardly deteriorates. Therefore, when the fixed lens 40 and the moving lens 60 are provided as in the illumination device 1 of the present embodiment, the optical efficiency can be set to a high value regardless of the position of the moving lens 60 in the Z direction, and the light is emitted from the light source 22. The emitted light can be efficiently used for illumination.

  FIG. 19 is a diagram for explaining the relationship between the position of the moving lens and the light distribution in the illumination device of the reference example having only one moving lens. In addition, FIG. 20 is a diagram illustrating the relationship between the position of the movable lens and the light distribution in the illumination device of the embodiment having the fixed lens and the movable lens (two lenses). 19 and 20, the moving distance represents the distance from the light source of the moving lens. The larger the positive value, the farther from the light source, the larger the negative value. It means that the distance from the light source is short. Further, as is clear from FIGS. 19 and 20, the light distribution angle becomes wider as the lens is moved closer to the light source from the narrow angle position (the position distant from the light source).

  In the example shown in FIG. 19, even in the illuminating device of the reference example, as shown in the case where the moving distance is 0, light is emitted to a narrow range immediately below the illuminating device at a position where the moving lens is away from the light source. And has excellent narrow-angle performance. However, as shown in the case where the moving distance is −9 or more and −5 or less, in the lighting device of the reference example, the light amount of the emitted light in the region directly below the lighting device is smaller than the light amount of the light emitted in the peripheral region. A low dropout phenomenon (a phenomenon in which the central part of the irradiation area becomes dark) can be confirmed over a wide range of movement distance, and the degree of dropout is also large. Here, although not shown, if the shape of the moving lens or the like is changed to suppress the center drop phenomenon, the narrow-angle performance deteriorates.

  On the other hand, in the case of the illuminating device of the embodiment shown in FIG. 20, as shown in the case where the moving distance is 0.5, the moving lens is far from the light source, and the light is narrow just below the illuminating device. It is emitted in the range and has excellent narrow-angle performance. Further, in most of the moving distances of -8 or more and 0.5 or less, the middle drop does not occur, and the occurrence of a very small middle drop is limited to the moving distances -3 and -4. Therefore, when the fixed lens 40 and the movable lens 60 are provided as in the illumination device 1 of the present disclosure, it is easy to realize both good narrow-angle characteristics and suppression of the center drop.

  Furthermore, the illumination device 1 of the present disclosure can also improve the durability of the moving lens. Specifically, in the illuminating device, as in the illuminating device 1 shown in FIG. 3, an annular Fresnel portion 68 that projects upward in the Z direction is provided on the outer diameter side of the moving lens 60, and the amount of light received by the moving lens 60 is increased. May be increased. Here, in general, when the moving lens is brought close to the light source, the Fresnel portion is located closest to the light source in the optical axis direction, so that strong light from the light source is applied to the Fresnel portion. Therefore, since the Fresnel portion absorbs light, the temperature of the Fresnel portion, especially the temperature at the tip thereof, rises, and the Fresnel portion is apt to undergo thermal deterioration.

  However, in the lighting device 1 of the present disclosure, as described with reference to FIG. 17, the light from the light source 22 can be controlled downward by the fixed lens 40, and travels from the light source 22 to the Fresnel portion 68 outward in the R direction. Light can be greatly suppressed, and the amount of light incident on the Fresnel portion 68 can be greatly reduced. Therefore, as shown in FIGS. 21 and 22, the tip temperature of the Fresnel portion 68 can be made lower when the moving lens 60 shown in FIG. 22 is closer to the light source than when the moving lens 60 shown in FIG. 21 is far from the light source. More specifically, in the state shown in FIG. 22, the moving lens 60 is closer to the light source than in the state shown in FIG. It is 69.1 ° C, which is lower than 0 ° C. Therefore, the thermal deterioration of the moving lens 60 can be largely suppressed, and the durability of the moving lens 60 can be improved.

  As described above, the lighting device 1 includes the housing 10, the light source 22 fixed in the housing 10, the light emitting unit fixed in the housing 10, and located on the light emitting side in the Z direction with respect to the light source 22 (see FIG. 3) 88 fixed lens 40 having. Further, the illuminating device 1 has a light projecting portion 87 which is arranged on the light emitting side in the Z direction with respect to the fixed lens 40, and the distance between the light source 22 and the light source 22 in the Z direction (optical axis direction) is variable. 60 is provided. Further, the light emitting portion 88 is configured by an end surface of the fixed lens 40 on the light emitting side in the Z direction, and the light projecting portion 87 is configured by an end surface of the movable lens 60 on the light emitting side in the Z direction.

  Therefore, more of the emitted light emitted from the light source 22 can be received by the fixed lens 40, and the light received by the fixed lens 40 can be controlled in a direction in which the inclination angle with respect to the Z direction is small, and the light is directed downward. Can be controlled. Therefore, the optical efficiency can be easily increased, the light can be efficiently used, and the light emitted from the light source 22 can be more precisely controlled by the moving lens 60. Therefore, it is easy to achieve both good narrow-angle characteristics and suppression of middle drop.

  Further, the moving lens 60 may have a Fresnel portion 68 on the outer peripheral side.

  According to this configuration, it is easy for the Fresnel unit 68 to receive the light emitted from the light source 22 to the outside in the R direction. Therefore, the optical efficiency can be increased. It is preferable that this configuration is adopted, but it is not necessary to be adopted and the moving lens may not have the Fresnel portion on the outer peripheral side.

  Further, the fixed lens 40 may have higher heat resistance than the movable lens 60. In this structure, for example, the fixed lens 40 is made of silicone resin or glass having excellent heat resistance, and the moving lens 60 is made of acrylic or polycarbonate having heat resistance lower than those of the silicone resin or glass. It can be realized.

  According to this configuration, the fixed lens 40 is less likely to be thermally deteriorated by light from the light source 22 and heat generated by the light source 22. Therefore, the durability of the lighting device 1 can be improved. The present configuration is preferably adopted, but may not be adopted. For example, the moving lens and the fixed lens may be made of the same transparent material, and the moving lens may have the same heat resistance as the fixed lens. Alternatively, the moving lens may have better heat resistance than the fixed lens.

  Further, the light source 22 may be mounted on the substrate 21. In addition, the tip 62 of the fixed lens 40 on the substrate 21 side is closer to the substrate 21 side in the Z direction than the position where the tip 62 of the light source 22 on the light emitting side is moved to the light emitting side by 1 mm (1 millimeter) in the Z direction. May be located.

  According to this configuration, the light emitted from the light source 22 can be more efficiently received by the fixed lens 40. Therefore, the optical efficiency can be further improved, and the light distribution control in the moving lens 60 can be executed more precisely.

  It should be noted that the present disclosure is not limited to the above-described embodiments and modifications thereof, and various improvements and changes can be made in the matters described in the claims of the present application and equivalent ranges thereof.

  For example, in the above embodiment, the case where the rotating member 80 has the inclined groove 81 and the optical block 95 has the fitting claw 78 has been described. However, the optical block may have an inclined groove on the outer peripheral surface that is inclined with respect to the optical axis direction, and the rotation member fits in the inclined groove and the rotation position of the rotation member causes the presence position to change in the inclined groove. It may have an artificial jaw.

  Further, the case where the optical block 95 is composed of the lens holder 70 and the movable lens 60 has been described. However, the optical block may be composed of only lenses.

  Moreover, the case where the inclined groove 81 penetrates the rotating member 80 in the thickness direction has been described. However, the inclined groove does not have to penetrate the side wall portion of the rotating member or the optical block in the thickness direction, and may have a bottom portion connecting between the pair of inner wall portions. However, when the inclined groove has a structure of a through hole that penetrates the member in which it is formed in the thickness direction, the dimension of the fitting claw in the thickness direction can be increased to increase the volume of the fitting claw. Can be made bigger. Therefore, the strength of the fitting claw can be increased, which is preferable.

  Further, the case where the fitting portion fitted into the inclined groove 81 is the plate-shaped fitting claw 78 has been described. However, the fitting portion that fits into the inclined groove may have any shape other than the plate shape, for example, a pin shape or the like.

  Further, the case has been described in which the lens fitting portion 73 is configured by a protruding portion that projects inward in the R direction, and the holder fitting portion 61 is configured by a concave portion that is recessed inward in the R direction. However, the lens fitting portion may be configured as a recessed portion that is recessed outward in the R direction, and the holder fitting portion may be configured as a protruding portion that projects outward in the R direction and fits into the recessed portion.

  Further, the lens holder 70 has the two concave portions 71 arranged at intervals in the θ direction, but the lens holder may have one or more concave portions. Further, the lens holder 70 has three lens fitting portions 73 arranged at intervals in the θ direction, and the movable lens 60 is fitted in three holders arranged at intervals in the θ direction. The case where the portion 61 is provided has been described. However, the lens holder only needs to have one or more lens fitting portions, and preferably has two or more lens fitting portions arranged at intervals in the θ direction. Further, the lens only needs to have one or more holder fitting portions, and preferably has two or more holder fitting portions arranged at intervals in the θ direction. Moreover, the case where the lighting device 1 has the two inclined grooves 81 arranged at intervals in the θ direction has been described. However, the lighting device may have only one inclined groove, or may have three or more inclined grooves arranged at intervals in the θ direction. When the illuminating device has N (N is any natural number) inclined groove, the rotating member may rotate by (360 / N) ° with respect to the base, and the illuminating device has two or more. With the inclined groove, the rotating member does not need to rotate 360 ° with respect to the base.

  A wide variety of configurations are known for making the movable lens movable in the optical axis direction, but the technique of the present disclosure can employ any of the techniques. For example, in the present embodiment, the configuration in which the rotating member 80 is rotatable with respect to the light source 22 without substantially changing the Z direction position has been described. However, the rotating member may be movable in the optical axis direction with respect to the housing, as in the technology described in Japanese Patent No. 5717516 and the technology described in Japanese Patent No. 6159460. The optical block or the movable lens may be movable in the optical axis direction with respect to the housing by being directly or indirectly fixed to the rotating member via another member.

  Further, although downlights and spotlights have a wide variety of structures, the technology of the present disclosure may be based on any of these various downlights and spotlights. Further, although the case where the lighting device 1 is the embedded downlight has been described, the lighting device may be a type that is hung on a rail or a type that is hung on a ceiling. In short, the lighting device of the present disclosure includes a housing, a light source fixed in the housing, and a fixed lens fixed in the housing and having a light emitting portion located on the light emitting side in the optical axis direction with respect to the light source. A movable lens having a light projecting portion arranged on the light emitting side in the optical axis direction with respect to the fixed lens and having a variable distance in the optical axis direction from the light source, A lighting device having any structure may be used.

  Furthermore, the movable lens may have one or more annular Fresnel portions projecting to the side opposite to the light emitting side in the optical axis direction (Z direction) on the outer peripheral side. In this case, since the Fresnel portion can more efficiently receive the light from the fixed lens, it is easy to increase the luminous intensity of the emitted light. Furthermore, the Fresnel portion changes the traveling direction of the received light to the optical axis side. As a result, the narrow-angle performance can be easily improved.

  Further, in particular, as shown in FIG. 14, the movable lens 60 has one annular Fresnel portion 68 projecting to the side opposite to the light emitting side in the optical axis direction (Z direction) and the outer periphery on the light incident side in the Z direction. It is preferable to have it on the side. In addition, as shown in FIG. 3, the lens effective diameter of the fixed lens 40 on the light emitting side in the Z direction (reference numeral 64 indicates one position located on the lens effective diameter of the fixed lens 40) is the same as that of the light source 22. It is preferable that the diameter is larger than the outer diameter and smaller than the lens effective diameter of the moving lens 60 on the light emission side in the Z direction (reference numeral 65 indicates one position located on the lens effective diameter of the moving lens 60).

  As described above, the light source 22 includes a plurality of LEDs (light emitting elements) mounted on the substrate 21 and a sealing member that seals the plurality of LEDs. As shown in FIG. 3, the lens effective diameter of the fixed lens 40 is larger than the diameter of the circumscribed circle of the annular edge of the light source 22 on the light emission side in the Z direction. The optical axis of the emitted light emitted from the light source 22 substantially coincides with the central axis of the fixed lens 40 and also the central axis of the movable lens 60.

  As shown in FIG. 9, in the present embodiment, since the light source 22 has a disc shape, the light emitting side annular edge of the light source 22 and its circumscribing circle coincide with each other. However, the light source may be, for example, a square or a rectangle when viewed from the optical axis direction, and in such a case, the circumscribed circle passes through the four corners of the annular edge on the light emitting side of the light source in the Z direction. It is defined as a circle. In addition, the lens effective diameter on the light emitting side of the fixed lens is located at the innermost side in the radial direction of one or more annular Fresnel portions formed on the side opposite to the light emitting side in the Z direction in the movable lens. It is preferably smaller than the inner diameter of the inner Fresnel portion. To describe a more specific example, in the present embodiment, the moving lens 60 has only one annular Fresnel portion 68 on the outer peripheral side on the light incident side in the Z direction, and the Fresnel portion 68 is the inner Fresnel portion. Becomes In this case, it is preferable that the lens effective diameter of the fixed lens 40 be smaller than the inner diameter of the annular Fresnel portion 68.

  Further, it is preferable that the fixed lens 40 has a condensing degree described below. FIG. 23 is a schematic diagram showing an example of the positional relationship between the light source 22, the fixed lens 40, and the moving lens 60 in a state where the moving lens 60 is arranged at the narrow angle position farthest from the light source 22. As shown in FIG. 23, the fixed lens 40 causes the ambient light 69 of the light cone (light cone) 67 emitted from the fixed lens 40 in the Z direction of the moving lens 60 arranged at the narrow angle position farthest from the light source 22. It is preferable to have such a degree of condensing that the light can be incident on the outer edge 72 of the light incident surface. In other words, the fixed lens 40 causes the ambient light 69, which is located in the surroundings of the emitted light emitted from the fixed lens 40, to be the outer edge portion of the light incident surface 74 of the movable lens 60 located closest to the light emitting side in the optical axis direction. It is preferable to have a degree of condensing light that can be incident on 75.

  Next, the function and effect derived from these configurations will be described. As described above, in this embodiment, the lens effective diameter of the fixed lens 40 is larger than the outer diameter of the light source 22 and smaller than the lens effective diameter of the moving lens 60. Therefore, the fixed lens 40 can efficiently receive the light emitted from the light source, and further, the focusing degree of the fixed lens 40 is changed so that the ambient light 69 emitted from the fixed lens 40 is arranged at a narrow angle position. It becomes easy to adjust the degree of light condensing that can be incident on the outer edge portion 75 of the light incident surface 74 of the lens 60. Further, when the lens effective diameter of the fixed lens 40 is smaller than the inner diameter of the annular Fresnel portion 68 as in the present embodiment, the ambient light 69 is further absorbed by the movable lens 60 arranged at the narrow angle position. It becomes easy to make the light incident on the outer edge portion 75 of the light incident surface 74.

  Further, in this embodiment, the ambient light 69 emitted from the fixed lens 40 is incident on the outer edge portion 75 of the light incident surface 74 of the moving lens 60 arranged at the narrow angle position. Therefore, as shown in FIG. 24, that is, the schematic diagram showing the control of the light at the narrow angle position of the moving lens 60 in such a case, the traveling direction of the ambient light 69 is the optical axis direction as shown by the arrow α. It is easy to change to a direction substantially parallel to (Z direction). Further, like the movable lens 60 of the present disclosure, when the Z-direction light emission side has one or more annular Fresnel portions 76 protruding toward the light emission side, the Fresnel portion 76 also has a function of the incident light. It is easy to change the traveling direction to a direction substantially parallel to the optical axis direction (Z direction) as indicated by arrow β. Therefore, when the moving lens 60 exists at a narrow angle position, it becomes easy to cause the emitted light emitted from the moving lens 60 to travel in the direct downward direction at all positions in the radial direction of the moving lens 60, and to increase the direct light intensity. It is possible to narrow the 1/2 beam angle (the angle at which the brightness is halved compared to the center) and the moving lens 60 has excellent narrow-angle performance when it is in the narrow-angle position. it can.

  Further, in the case of having the above-described configuration, the occurrence of the drop phenomenon can be effectively suppressed as described below with reference to FIGS. 25 and 26. FIG. 25 is a diagram showing a traveling direction of light at an intermediate angle position in an illumination device in which the fixed lens 40 does not exist and only the moving lens 60 exists in comparison with the illumination device 1. In such a case, as shown in the area surrounded by the alternate long and short dash line in FIG. 25, the light L1 that is totally reflected by the total reflection surface 68a of the Fresnel portion 68 on the light incident side and the outer peripheral side and proceeds in the same direction increases, Due to the light L1, a peak of the illuminance of light higher than that in the directly downward direction occurs on the irradiation surface. Further, as shown in a region surrounded by a chain double-dashed line in FIG. 25, the light L2 that is refracted at the Fresnel portion 76 (see FIG. 24) on the light emission side and the radial center side and travels in the same direction also increases, This light L2 also produces a peak of the illuminance of light higher than that in the direct downward direction on the irradiation surface. Therefore, the drop phenomenon appears from the peaks of the illuminance of the lights L1 and L2.

  On the other hand, when the ambient light 69 emitted from the fixed lens 40 is adapted to enter the outer edge portion 75 of the light incident surface 74 of the moving lens 60 arranged at the narrow angle position, as shown in FIG. As shown in the schematic diagram corresponding to FIG. 23 in the state where the moving lens 60 is arranged at the wide-angle position where the moving lens 60 is closest to the light source 22, the ambient light 69 emitted from the fixed lens 40 is generated by the moving lens 60 as the light source. As it approaches 22, the light does not enter the Fresnel portion 68 on the outer peripheral side of the moving lens 60. Therefore, when the moving lens 60 is present at the middle angle position, the light L1 totally reflected by the total reflection surface 68a can be reduced, and as a result, the drop phenomenon can be effectively suppressed.

  Further, the light totally reflected by the Fresnel portion projecting to the side opposite to the light emitting side in the Z direction cannot control the light distribution and easily causes a drop phenomenon. As the projecting Fresnel portion is arranged more radially inward, the light from the light source is more likely to be totally reflected by the total reflection surface of the Fresnel portion. Therefore, like the illuminating device 1, when only one annular Fresnel portion 68 that protrudes to the side opposite to the light emitting side is provided on the outer peripheral side (for example, the outermost periphery) on the light incident side in the Z direction, It is preferable because it is possible to suppress the light totally reflected by the total reflection surface which causes the drop.

  Further, in particular, it is preferable that the lens effective diameter of the fixed lens 40 be equal to or smaller than 2.5 times the diameter of the light source 22, and more specifically, the lens effective diameter of the fixed lens 40 is the diameter of the circumscribed circle. It is preferably 2.5 times or less. According to this modification, it is possible to obtain narrow-angle performance without increasing the size of a general instrument, for example, 14 ° at a 1/2 beam angle without increasing the size of a general instrument. It is possible to achieve excellent narrow-angle performance of less than. In the case of a device such as a universal downlight that can adjust the optical axis direction by swinging, it is difficult to extend the device because the diameter of the embedded hole in the ceiling is fixed and the swinging angle of the device is convenient. Therefore, the function and effect of this configuration become more remarkable.

  Further, as described in the first half of the present specification, the Z direction position of the tip (upper end in Z direction) of the fixed lens on the substrate side matches the Z direction position of the tip (lower end in Z direction) of the light emitting side of the light source. Further, it is more preferable that the light source is located closer to the substrate than the Z-direction lower end of the light source in the Z direction. In that case, the substrate-side tip of the fixed lens may contact the substrate. Further, the fixed lens 40 covers the light emitting surface of the light source 22 over the entire circumference in the circumferential direction in a range tilted by −90 ° or more and 90 ° or less with respect to the optical axis direction of the emitted light emitted from the light source 22. Is preferable. In other words, as shown in FIG. 5, the fixed lens 40 is located on the facing surface 77 facing the light source 22 in the optical axis direction, and is located on the outer peripheral side of the facing surface 77, and is positioned on the optical axis side of the facing surface 77. And an annular Fresnel portion 79 projecting to the side opposite to the light emitting side in the direction. The light emitting surface of the light source 22 may be housed in the recess 91 defined by the facing surface 77 and the annular Fresnel portion 79.

  The fixed lens may have a concave light incident surface and a convex light emitting surface side. The side of the fixed lens opposite to the light emitting side in the optical axis direction may be located closer to the mounting surface side of the light emitting element on the substrate than the light emitting surface of the light source. Alternatively, the fixed lens may have a Fresnel portion that is convex in the light source direction outside the outer diameter of the light source 22 in the radial direction. The tip of the Fresnel portion on the side opposite to the light emitting side in the optical axis direction may be located closer to the mounting surface side of the light emitting element on the substrate than the light emitting surface of the light source. According to this modification, almost all of the light emitted by the light source 22 can be incident on the fixed lens 40. Therefore, stray light can be greatly reduced and the luminous intensity of the emitted light can be increased. Further, a light beam that cannot be picked up by the fixed lens 40 and leaks from the gap between the peripheral members of the light emitting element becomes uncontrollable through reflection in the device and jumps to a place unnecessary for light distribution. It can also be suppressed. Due to the vertical movement of the movable lens 60 and the holding member thereof, it is difficult to hide the position causing the reflection (for example, the inner surface of the lamp body) at any position of the movable lens 60. According to this configuration, such uncontrollable light can be suppressed, and light unevenness on the irradiation surface can be improved.

  It should be noted that when the moving lens is present around the wide-angle position, color unevenness may occur in the irradiation light. It is preferable to improve the color unevenness as follows. Specifically, it is preferable to form a structure for diffusing light in a part or the whole of the fixed lens, and for example, in the fixed lens, it is preferable to form a concavo-convex structure such as a wrinkle on the light incident surface facing the light source in the optical axis direction. When improving the color unevenness by forming a structure such as a grain that diffuses light on the fixed lens and a structure such as dimples that diffuses light on the moving lens, do not form a structure that diffuses light on the fixed lens at all. In addition, it is possible to suppress an increase in luminance as compared with a case where a structure such as a dimple having a deep light-diffusing depth is formed only in the moving lens to improve color unevenness. Therefore, when a structure having diffusivity is formed on a part or the whole of the fixed lens, glare can be suppressed.

  More specifically, since the fixed lens does not appear in the instrument shell, while the moving lens appears in the instrument shell, when light is diffused on the surface, the light distribution is outside the angle (for example, when looking up at the instrument. The brightness becomes dazzling when the device is looked up at an angle of 30 °. By forming a structure that diffuses light on part or all of the fixed lens, it is possible to suppress the brightness of light at an extra angle outside the intended light distribution angle of the fixture, and the glare caused by such light. Can be suppressed.

  Further, in an illumination device having only one moving lens, when the moving lens is formed of a transparent material having high heat resistance (for example, silicone or glass), the moving lens is formed of a general-purpose transparent resin (for example, acrylic or polycarbonate). Compared with the case of doing, the material cost is high and the molding is not easy. On the other hand, in the two-lens structure of the present disclosure, the fixed lens can be made small and the shape of the fixed lens can be made simple. Therefore, in a lighting device having only one moving lens, as compared with the case where the moving lens is made of a transparent material having high heat resistance, the moving lens is made of a general-purpose transparent resin with the two-lens structure of the present disclosure. On the other hand, when the fixed lens is made of a transparent material having high heat resistance, not only the heat resistance of the two-lens structure can be improved, but also the manufacturing cost can be easily reduced and the molding can be easily performed.

  DESCRIPTION OF SYMBOLS 1 illuminating device, 10 housing, 21 substrate, 22 light source, 29 light emitting side end of light source, 40 fixed lens, 60 moving lens, 62 fixed lens substrate side end, 68 Fresnel part, 69 ambient light, 72 movement Outer edge of light incident surface of lens, 74 Light incident surface of moving lens, 75 Outer edge of light incident surface of moving lens, 77 Opposing surface, 79 Fresnel part, 87 Light emitting part, 88 Light emitting part, 91 concave part, R direction Radial direction of lens body, θ direction Circumferential direction of lens body, Z direction Optical axis direction.

Claims (9)

Housing and
A light source fixed in the housing,
A fixed lens having a light emitting portion that is fixed in the housing and is located on the light emitting side in the optical axis direction with respect to the light source;
A movable lens having a light projecting section arranged on the light emission side in the optical axis direction with respect to the fixed lens, and a distance in the optical axis direction with the light source being variable;
Lighting device.   The illumination device according to claim 1, wherein the movable lens has one or more annular Fresnel portions projecting to the side opposite to the light emitting side in the optical axis direction on the outer peripheral side.   The lighting device according to claim 1, wherein the fixed lens has better heat resistance than the movable lens. The light source is mounted on a substrate,
The tip of the fixed lens on the substrate side is located closer to the substrate in the optical axis direction than the position of the tip of the light source on the light emitting side moved by 1 mm to the light emitting side in the optical axis direction. The lighting device according to any one of claims 1 to 3. The light source includes a plurality of light emitting elements mounted on the substrate, and a sealing member for sealing the plurality of light emitting elements,
The optical axis of the emitted light emitted from the light source substantially coincides with the central axis of the fixed lens, and substantially coincides with the central axis of the movable lens,
The lens effective diameter of the fixed lens on the light emission side is larger than the diameter of the circumscribed circle of the annular edge of the light source on the light emission side in the optical axis direction, The lighting device according to any one of claims 1 to 4, which is also small.   The illumination device according to claim 5, wherein the lens effective diameter of the fixed lens is 2.5 times or less the diameter of the circumscribing circle.   The fixed lens may cause the light, which is located in the periphery of the emitted light emitted from the fixed lens, to be incident on the outer edge portion of the light incident surface of the movable lens which is located closest to the light emitting side in the optical axis direction. Illumination device according to any one of claims 1 to 6, having a possible concentration. The fixed lens is located on the facing surface facing the light source in the optical axis direction and on the outer peripheral side of the facing surface, and is opposite to the light emitting side in the optical axis direction with respect to the facing surface. And an annular Fresnel portion projecting to the side,
The lighting device according to claim 1, wherein a light emitting surface of the light source is housed in a recess defined by the facing surface and the annular Fresnel portion. The light source includes a plurality of light emitting elements mounted on the substrate, and a sealing member for sealing the plurality of light emitting elements,
The optical axis of the emitted light emitted from the light source substantially coincides with the central axis of the fixed lens, and substantially coincides with the central axis of the movable lens,
The lighting device according to claim 2, wherein the lens effective diameter of the fixed lens is smaller than the inner diameter of the inner Fresnel portion located on the innermost side in the radial direction among the one or more annular Fresnel portions.

Images