JP5994207B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  As an illuminating device comprising a main body case that can accommodate a light source therein and a cover that covers the opening of the main body case, for example, there is an “illuminating device” disclosed in Patent Document 1 below. The lighting device is provided so as to surround a semiconductor light emitting element (light source), a container (main body case) having an opening (opening) that accommodates the light emitting element and emits the emitted light to the outside, and the opening of the container. A heat radiating plate (cover) that dissipates heat generated by the light emitting element to the outside air, a glass plate (translucent plate) that diffuses light emitted from the light emitting element, and the like are included.

  This type of lighting device is used by being embedded in, for example, a ceiling, a wall, or a floor, and the glass plate covering the opening of the heat radiating plate is used when the container and the heat radiating plate are attached to the ceiling or the like. It is fixed and assembled by being pinched between. Moreover, the thick part which can press a glass plate with respect to a heat sink is formed in this container (refer patent document 1; FIG. 6).

JP 2011-60450 A

  However, according to such an illuminating device, for example, when the illuminating device is removed for maintenance, the container and the heat radiating plate (cover) are detached separately, so that the glass plate sandwiched between them. Also comes off with it. For this reason, there exists a problem that a glass plate may fall during a maintenance work and it is difficult to work. Moreover, if the thick part which presses a glass plate is formed in a container, the weight of a container will increase easily.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an illumination device that can improve maintainability. It is another object of the present invention to provide a lighting device that can be reduced in weight.

  To achieve the above object, a lighting device according to claim 1 of the present invention emits light emitted from a light source, a main body case having an opening and accommodating the light source therein, and the light source. A window frame forming a possible window portion and a peripheral wall formed on the outer periphery of the window frame to cover the opening of the main body case, and at a predetermined position in a direction away from the window frame inside the peripheral wall A cover having a circumferential groove, a translucent plate having a thickness substantially the same as the distance from the window frame to the predetermined position and covering the window portion from the inside of the cover, and a C-shape. An annular locking member that has an outer diameter in a free state that is equal to or greater than an outermost diameter of the circumferential groove of the cover and is elastically deformable radially inward to an outer diameter that is smaller than an inner diameter of the peripheral wall, The annular locking member engages with a groove, and the translucent plate is And wherein the holding bar. The “free state” refers to a state where the annular locking member is left without being applied with an external force.

  Moreover, the illuminating device described in claim 2 of the claim is the illuminating device described in claim 1, wherein the annular locking member is gradually formed from both ends of the C-shape toward the central portion. The C-shaped inner diameter is larger than the opening diameter of the window portion in a state of being engaged with the circumferential groove.

  The lighting device according to claim 3 of the claim is the lighting device according to claim 2, wherein the annular locking member has a width at the center thereof that is approximately twice the width at both ends. It is characterized by being 3 times or less.

  Moreover, the illuminating device described in claim 4 of the claims is the illuminating device described in claims 1 to 3, wherein the light transmitting plate is provided between the window frame of the cover and the light transmitting plate. And a buffer member between the annular locking member.

  Moreover, the illuminating device described in claim 5 of the claims is the illuminating device described in claims 2 to 4, wherein the annular locking member has the translucent plate in the window frame direction of the cover. It has the press part to press, It is characterized by the above-mentioned.

  In the present invention, since the annular locking member is locked to the cover by engaging the annular locking member with the circumferential groove of the cover, the thickness of the translucent plate is between the annular locking member and the window frame of the cover. Movement in the vertical direction is restricted. Thereby, since the translucent plate is held by the cover, even if the cover is removed from the main body case, the translucent plate is not detached from the cover. Therefore, when the lighting device is attached to a ceiling or the like, even if the cover is removed from the ceiling or the like, maintainability is improved in order to prevent the translucent plate from falling.

  Moreover, for example, when the movement in the thickness direction of the light transmitting plate is restricted by forming a thick portion in the main body case and pressing the light transmitting plate, as in the technique disclosed in Patent Document 1 described above. In comparison, in the present invention, the movement of the translucent plate in the thickness direction can be restricted without forming such a thick portion. For this reason, it becomes possible to reduce a weight of an illuminating device.

  Furthermore, when attaching a translucent plate to a cover, a comparison is made in which a C-shaped annular locking member that is elastically deformed radially inward is engaged with a circumferential groove and then freed to return to its original state. The translucent plate can be attached with simple work. Thereby, since the attachment of a translucent board becomes easy, an assembly property improves.

  Furthermore, when the translucent plate is attached to the cover, a buffer member is interposed between the window frame of the cover and the translucent plate, or between the translucent plate and the annular locking member, and the translucent plate is pressed against the cover. To do. Thereby, for example, even if a gap is generated between the window frame of the cover and the translucent plate, or between the translucent plate and the annular locking member, the buffer member presses them to eliminate the gap. Therefore, it is possible to prevent the light-transmitting plate from rattling due to such a gap. In addition, it replaces with such a buffer member, and the same effect is acquired even if it provides a press part in the cover window frame direction of an annular locking member.

FIG. 1A is a perspective view showing an external configuration of a lighting device according to the present embodiment, FIG. 1A is a view of the lighting device from the cover side (front side), and FIG. ), FIG. 1C shows the usage state of the lighting device. 2A is a front view of the case body with the cover removed, and FIG. 2B is a front view of the lighting device. 3A is a cross-sectional view taken along line 3A-3A shown in FIG. 2B, FIG. 3B is a cross-sectional view taken along line 3B-3B shown in FIG. 2B, and FIG. It is an expanded sectional view in a dashed-dotted line circle shown in (B). It is the perspective view which looked at the cover from the back side. FIG. 5A is a front view, FIG. 5B is a bottom view seen from the 5B direction, and FIG. 5C is a right side view seen from the 5C direction. It is. It is explanatory drawing which shows the dimensional relationship between the circumferential groove of a cover, and a snap ring, and is a figure which shows a cover, a snap ring in a free state (solid line), a snap ring in a deformed state (broken line), and a snap ring in a front view from the top of the page. is there. FIG. 7 (A) is a front view, FIG. 7 (B) is a bottom view seen from the 7B direction, and FIG. 7 (C) is a 7C direction. FIG. It is a perspective view which shows the state which decomposed | disassembled the illuminating device. 9A is a front view of the main body case, and FIG. 9B is a rear view of the main body case. 10A is a plan view of the main body case, and FIG. 10B is a bottom view of the main body case. 11A is a right side view of the main body case, and FIG. 11B is a left side view of the main body case. 12A is a perspective view of the main body case viewed from the front oblique direction, and FIG. 12B is a perspective view of the main body case viewed from the rear oblique direction. FIG. 13A is a front view of an LED module constituting the lighting device, and FIG. 13B is a rear view of the LED module. FIG. 14A is a plan view of the LED module, and FIG. 14B is a bottom view of the LED module. FIG. 15A is a right side view of the LED module, and FIG. 15B is a left side view of the LED module. It is the perspective view seen from the front diagonal direction of the LED module.

  Hereinafter, the illumination device according to the present embodiment will be described with reference to the drawings. First, an external configuration and the like of the lighting device 10 according to the present embodiment will be described with reference to FIG.

  As shown in FIGS. 1 (A) and 1 (B), the illumination device 10 is mainly composed of a main body case 30 and a cover 50. The main body case 30 accommodates an LED module to be described later. The cover 50 is provided with a window 50a, and light emitted from the LED module is emitted from the window 50a.

  As shown in FIG. 1C, the lighting device 10 is used as a downlight, for example, attached to a vehicle or a ceiling or wall of a building. A hole 100a that is slightly larger than the outer diameter of the lighting device 10 (the cover 50) is formed in the ceiling 100, and the surface of the window frame 52 of the cover 50 and the surface of the ceiling 100 are approximately the same height in the hole 100a. In other words, it is embedded to be flush. The lighting device 10 is fixed to the ceiling 100 via a mounting nut 38 provided in the main body case 30.

  1, reference numeral 32 denotes a case peripheral wall, reference numeral 33 denotes a flange portion, reference numeral 36 denotes a cable hole, reference numeral 39 denotes a grounding bolt, reference numeral 53 denotes a cover peripheral wall, reference numeral 60 denotes an outer lens, reference numeral Reference numeral 90 denotes a bolt. These will be described later.

  Next, details of each component of the illumination device 10 will be described with reference to FIGS. Before describing the configuration of the cover 50, first, the LED module 20 will be described with reference to FIG. 2 (A) and FIG. Note that FIG. 3 (A) is a cross-sectional view taken along the line 3A-3A that is bent from the center of the cover 50 into a “hoop shape” as shown in FIG. 2 (B). I want.

  The LED module 20 includes a substrate 21 and LEDs 22. The board | substrate 21 is a printed wiring board (a glass epoxy board | substrate, an aluminum base board | substrate, etc.), and is formed in circular shape in this embodiment, for example. A plurality of LEDs 22 are soldered to the surface of the substrate 21 at predetermined intervals. In the present embodiment, 30 LEDs 22 are arranged in a matrix on almost the entire surface of the substrate 21.

  The LED 22 is a light-emitting diode with a high luminance specification, and is a semiconductor light-emitting element that emits white light when a predetermined constant current is supplied as driving power. In this embodiment, the resin is molded to the chip component specifications so as to be surface-mounted on the substrate 21. The emission color may be other than white such as red, green, blue and yellow.

  The back surface of the substrate 21 is fixed with an adhesive, a double-sided tape or the like (having good heat transfer characteristics) so that the entire surface is in contact with the bottom 31 of the main body case 30. As a result, the back surface of the substrate 21 comes into substantially planar contact with the bottom portion 31, so that the heat generated by the LEDs 22 can be released to the main body case 30 satisfactorily. A circular notch 23 is provided at a part of the periphery of the substrate 21. The notch 23 is provided for a power cable (not shown) for supplying power to the LED 22, and the inner diameter thereof is set larger than the outer diameter of the power cable.

  Next, the main body case 30 will be described with reference to FIGS. The main body case 30 is a bottomed cylindrical body in which a bottom portion 31, a case peripheral wall 32, a flange portion 33, a folded portion 34, and the like are integrally formed by pressing or the like. In the present embodiment, the main body case 30 is made of aluminum, for example, because of good workability and thermal conductivity.

  The bottom 31 is formed in a flat circular shape, and includes a case peripheral wall 32 that falls toward the opening 30a over the entire circumference of the periphery. The case peripheral wall 32 gradually increases in diameter in a cylindrical shape from the bottom 31 toward the opening 30a, and its axial cross section has a trapezoidal shape (see FIG. 3).

  The flange portion 33 is formed in an annular shape from the opening 30 a side of the case peripheral wall 32 toward the radially outer side of the main body case 30. The flange portion 33 is provided with a cylindrical mounting nut 38 having female screw portions 38a at predetermined intervals in the circumferential direction. The mounting nut 38 is press-fitted and fixed in a hole formed in the flange portion 33. In the present embodiment, mounting nuts 38 are provided at four locations at equal intervals. The mounting nut 38 is for attaching the lighting device 10 to the ceiling 100 or the like directly or via a bracket or the like.

  The folded portion 34 is formed so as to rise toward the bottom 31 over the entire circumference of the periphery of the flange portion 33. The folded portion 34 is provided with cylindrical casing nuts 37 having a female threaded portion 37a toward the case peripheral wall 32 side at predetermined intervals in the circumferential direction. In the present embodiment, casing nuts 37 are provided at two opposing positions. The casing nut 37 is for fixing the main body case 30 and the cover 50 by screwing a bolt 90 to the female screw portion 37a, and is press-fitted and fixed in a hole formed in the folded portion 34.

  A cable hole 36 is provided in the bottom 31. The cable hole 36 is provided for a power cable for supplying power to the LED 22 similarly to the notch 23, and the inner diameter thereof is set larger than the outer diameter of the power cable. Further, in the vicinity of the cable hole 36, a grounding bolt 39 (see FIGS. 1 and 8 to 12) is provided. The grounding bolt 39 is inserted from the bottom 31 side of the main body case 30 and protrudes toward the outside of the bottom 31. By attaching a grounding wire to the grounding bolt 39, static electricity or the like can escape to the ground.

  Next, the configuration of the cover 50 will be described based on FIGS. 2 (B), 3 and 4. FIG. The cover 50 covers the opening 30 a of the main body case 30, and holds and accommodates an outer lens 60, a diffusion film 61, and a diffusion lens 62 (hereinafter referred to as “outer lens 60 etc.”) described later by a snap ring 70 described later. Is. In the cover 50, the window frame 52 and the cover peripheral wall 53 are integrally formed by press working or the like. In the present embodiment, the cover 50 is also made of, for example, aluminum having good workability and thermal conductivity, like the main body case 30.

  The window frame 52 forms a window portion 50a for emitting light emitted from the LEDs 22 to the outside, and has a wide annular shape. The window frame 52 is formed with a cover peripheral wall 53 that rises over the entire outer periphery of the window frame 52.

  The cover peripheral wall 53 is provided with a through hole 55 at a position corresponding to the casing nut 37 provided in the folded portion 34 of the main body case 30. Thus, in a state where the main body case 30 is covered with the cover 50, the bolt 90 passing through the through hole 55 is screwed to the female screw portion 37 a of the casing nut 37, so that the cover 50 can be fixed to the main body case 30. become. A circumferential groove 54 is provided on the inner peripheral wall of the cover peripheral wall 53 at a position separated from the window frame 52 by a distance substantially the same as the distance corresponding to the total thickness of the outer lens 60 and the like. A snap ring 70 which will be described later is engaged with the circumferential groove 54.

  As shown in FIG. 3C, the cover peripheral wall 53 has a difference k in the inner diameter of the inner peripheral wall with the peripheral groove 54 as a boundary. That is, the inner peripheral wall of the cover peripheral wall 53 is set to have an inner diameter smaller on the inner peripheral wall on the side of the window frame 52 than on the peripheral groove 54 than on the inner peripheral wall on the opposite side of the window frame 52. For this reason, in the circumferential groove 54, the step part 54a is formed in the window frame 52 side. This facilitates positioning of the snap ring 70, as will be described later.

  The cover 50 accommodates an outer lens 60 so as to close the window 50a from the inside. In the present embodiment, the outer lens 60 is a circular, colorless and transparent glass plate, and its outer diameter is set to be larger than the inner diameter of the window frame 52 and slightly smaller than the inner diameter of the cover peripheral wall 53. A diffusion film 61 is attached to the entire inner surface of the outer lens 60 facing the inside of the window 50a. The diffusion film 61 is, for example, a milky white sheet member having birefringence, and diffuses light emitted from the LED 22. As a result, the light from the LED 22 can be emitted to the outside almost uniformly. The diffusion film 61 also functions as a scattering prevention film when the diffusion lens 62 is broken.

  The diffusion lens 62 is accommodated in the cover 50 so as to overlap the inner surface side of the outer lens 60. The diffusing lens 62 is formed in substantially the same disk shape as the outer lens 60 and has a function of diffusing light emitted from the LED 22 over a wide range.

  As shown in FIGS. 3 and 5, the snap ring 70 is made of, for example, a thin plate spring steel and is formed in a C shape by press working or the like. The outer diameter of the snap ring 70 is set larger than the inner diameter of the circumferential groove 54 of the cover 50. The outer diameter of the snap ring 70 here is an outer diameter in a state where an external force is not applied to the snap ring 70 (hereinafter referred to as “free state”).

  Further, the inner diameter of the snap ring 70 is set larger than the opening diameter of the window portion 50a of the cover 50, and the inner diameter is the opening diameter of the window portion 50a even when locked to the circumferential groove 54 as will be described later. It is set not to become smaller than. This prevents the snap ring 70 from blocking the light emitted by the LED 22. The plate thickness of the snap ring 70 is slightly thinner than the groove width of the circumferential groove 54 of the cover 50, and is set to about 1.5 mm for a groove width of 1.6 mm, for example.

  The shape of the snap ring 70 is not a simple C-shape, and is set so that the width gradually increases from the both end portions 71 toward the central portion 72 and the width becomes the largest at the central portion 72. The width of the central portion 72 is set in a range of about 2 to 3 times the width of the end portion 71, and is set to 2.5 times in this embodiment. These numerical values are determined by characteristics of metal materials such as elastic modulus, individual specific experiments, computer simulations, and the like. As a result, the snap ring 70 is reduced in diameter by a relatively simple operation and has an elastic force that can be locked in the circumferential groove 54 of the cover 50.

  Each end portion 71 of the snap ring 70 is provided with a tip portion 73 formed in an annular shape having a diameter larger than the width of the end portion 71. The distal end portion 73 is formed so as to enter the radially inner side of the snap ring 70, and the distal end portion 73 is positioned so as to be within the outer peripheral diameter of the snap ring 70. The through hole 74 of the distal end portion 73 is provided for inserting the distal end of a radio pliers-like unillustrated jig. That is, by operating the jig so as to close the tips of the jigs inserted into the through holes 74 of the respective end portions 71, the snap ring 70 is reduced in diameter so that the separation distance between both the end portions 71 is narrowed. . As a result, the snap ring 70 can be attached to the circumferential groove 54 of the cover 50 as described below.

  Next, the dimensional relationship between the cover 50 and the snap ring 70 when the snap ring 70 is attached to the cover 50 will be described with reference to FIG. In this figure, the snap ring 70 in the free state is represented by a solid line, and the snap ring 70 'in the deformed state is represented by a broken line. D1 represents the inner diameter of the circumferential groove 54, d2 represents the inner diameter of the cover peripheral wall 53, d3 represents the free outer diameter of the snap ring 70, and d3 'represents the reduced outer diameter of the snap ring 70.

  As shown in FIG. 6, the free outer diameter d3 of the snap ring 70 is set larger than the inner diameter d1 of the circumferential groove 54 and the inner diameter d2 of the cover peripheral wall 53. Therefore, the snap ring 70 does not enter the cover 50 as it is. For this reason, the snap ring 70 is reduced in diameter so that the reduced diameter outer diameter d 3 ′ of the snap ring 70 is smaller than the inner diameter d 2 of the cover peripheral wall 53 using the jig described above. As a result, the reduced diameter snap ring 70 ′ can be put into the cover 50. Then, the snap ring 70 ′ is released from the jig by aligning the snap ring 70 ′ so that it enters the circumferential groove 54. Then, the snap ring 70 that has become free in the circumferential groove 54 engages with the circumferential groove 54, so that the snap ring 70 is locked to the cover 50. As a result, the outer lens 60 and the like sandwiched between the snap ring 70 and the window frame 52 of the cover 50 are held by the cover 50, so that the movement of the outer lens 60 and the like in the axial direction is restricted.

  By the way, although the movement of the outer lens 60 and the like in the axial direction can be restricted by the snap ring 70, the distance from the window frame 52 to the circumferential groove 54 of the cover 50 corresponds to the total thickness of the outer lens 60 and the like. When the distance is larger than the distance, a gap is generated between the window frame 52 and the outer lens 60, between the outer lens 60 and the diffusing lens 62, or between the diffusing lens 62 and the snap ring 70. Therefore, there is a possibility that the outer lens 60 or the like is loose between the window frame 52 and the snap ring 70. In order to increase the processing accuracy of the cover 50, the outer lens 60, and the like and suppress the generation of this gap, there is a problem in terms of manufacturing cost and equipment cost.

  Therefore, in the present embodiment, the gap is eliminated by sandwiching the nonwoven fabric 80 (see FIGS. 3C and 8) between the window frame 52 of the cover 50 and the outer lens 60. The nonwoven fabric 80 is attached between the window frame 52 of the cover 50 and the outer lens 60 at a predetermined interval in the circumferential direction by an adhesive, double-sided tape, or the like. In the present embodiment, for example, the nonwoven fabric 80 is attached to 12 locations at equal intervals. As a result, the outer lens 60 and the like are pressed toward the snap ring 70, so that there is no gap in the axial direction and it is possible to suppress the play of the outer lens 60 and the like. The nonwoven fabric 80 may be sandwiched between the outer lens 60 and the diffusing lens 62.

  Next, as another configuration example of the snap ring 70, a snap ring 170 provided with a convex portion 175 will be described with reference to FIG. The snap ring 170 is different from the snap ring 70 described above in that a convex portion 175 is provided. For this reason, the other components are substantially the same, and the description of these portions is omitted. Note that reference numerals 70, 71, 72, 73, and 74 shown in FIG. 5 correspond to reference numerals 170, 171, 172, 173, and 174 shown in FIG. 7, respectively.

  The convex portions 175 are provided at predetermined intervals in the circumferential direction by performing press working or the like. In the present embodiment, for example, convex portions 175 are provided at eleven locations at equal intervals. Accordingly, when the snap ring 170 is engaged with the circumferential groove 54 so that the convex portion 175 faces the outer lens 60 side, the outer lens 60 and the like are pressed toward the window frame 52 side of the cover 50. Therefore, since there is no gap in the axial direction, it is possible to suppress rattling of the outer lens 60 and the like without attaching the nonwoven fabric 80.

  Next, an example of a procedure for assembling the lighting device 10 according to the present embodiment will be described with reference to FIGS. 2, 3, 6, and 8. First, the LED module 20 is attached to the main body case 30. For example, after applying an adhesive to the back side of the LED module 20 or the bottom 31 of the main body case 30, alignment is performed so that both the notch 23 of the LED module 20 and the cable hole 36 of the main body case 30 are aligned with each other. The back surface of 21 is brought into close contact with almost the entire surface of the bottom 31. After the adhesive is dried, the power cable is soldered to the board 21 of the LED module 20 through the power cable (not shown) through the cable hole 36. Thereby, the main body case 30 side is assembled. A double-sided tape may be used instead of the adhesive. Moreover, you may fix the LED module 20 to the main body case 30 by screw fastening.

  The assembly on the cover 50 side is performed by the following procedure, for example. After the nonwoven fabric 80 is affixed to the inside of the window frame 52 at an equal interval in the circumferential direction with an adhesive or a double-sided tape, the outer lens 60 or the like is placed on the window frame 52 with the nonwoven fabric 80 attached. Next, the tips of the jigs are inserted into both through holes 74 of the snap ring 70, and the snap ring 70 is reduced in diameter by the jig until the outer diameter of the snap ring 70 becomes equal to or smaller than the reduced diameter outer diameter d3 ′. The reduced diameter snap ring 70 ′ is aligned with the circumferential groove 54 of the cover 50. At this time, as described with reference to FIG. 3C, the snap ring 70 ′ can be easily positioned by bringing the snap ring 70 ′ into contact with the stepped portion 54 a of the circumferential groove 54. After confirming that the entire circumference of the snap ring 70 ′ is located in the circumferential groove 54, the jig is loosened to engage the outer circumferential edge of the snap ring 70 with the circumferential groove 54. Thereby, since the snap ring 70 is locked to the circumferential groove 54, the outer lens 60 and the like are attached to the cover 50, and the cover 50 side is assembled.

  The main body case 30 side and the cover 50 side assembled in this way are fixed with bolts 90. That is, after covering the main body case 30 with the cover 50 so as to cover the opening 30 a of the main body case 30, the cover 50 is mounted so that the through hole 55 of the cover 50 fits the casing nut 37 (female screw portion 37 a) of the main body case 30. Turn to align. When the alignment is completed, the bolt 90 is screwed into the casing nut 37 and fixed by screwing. Thereby, the assembly | attachment of the illuminating device 10 is completed.

  9 to 11 show six views of the main body case 30. FIG. FIG. 12 is a perspective view of the main body case 30. FIGS. 13 to 15 show a six-face view of the LED module 20, and FIG. 16 shows a perspective view of the LED module 20.

  As described above, according to the lighting device 10 according to the present embodiment, the LED module 20, the main body case 30 that has the opening 30a and can accommodate the LED module 20, and the light emitted from the LED module 20 is emitted. A window frame 52 that forms a possible window portion 50 a and a cover peripheral wall 53 formed on the outer periphery of the window frame 52 to cover the opening 30 a of the main body case 30, and from the window frame 52 inside the cover peripheral wall 53. A cover 50 having a circumferential groove 54 at a predetermined position in the direction of separation, an outer lens 60 having a thickness approximately the same as the distance from the window frame 52 to the predetermined position and covering the window 50a from the inside of the cover 50, etc. And a free outer diameter d3 is equal to or larger than the inner diameter d1 of the circumferential groove 54 of the cover 50 and a reduced outer diameter d3 ′ smaller than the inner diameter d2 of the cover peripheral wall 53. It provided with elastically deformable snap ring 70 to the inward direction, a. Then, the snap ring 70 is engaged with the circumferential groove 54 to hold the outer lens 60 and the like on the cover 50.

  Thereby, since the outer lens 60 and the like are held between the snap ring 70 locked in the circumferential groove 54 and the window frame 52 of the cover 50, movement of the outer lens 60 and the like in the axial direction is restricted, The outer lens 60 or the like does not fall off from the cover 50. Therefore, even if the cover 50 is removed from the illumination device 10, the outer lens 60 and the like do not fall, so that maintainability is improved. Further, since it is not necessary to provide the main body case 30 with a portion that restricts the movement of the outer lens 60 in the axial direction, the main body case 30 is provided with a portion that restricts the movement of the outer lens 60 in the axial direction. In comparison, the weight of the lighting device 10 can be reduced.

  In the present embodiment, the main body case 30 and the cover 50 are made of aluminum, but may be formed of other metals or synthetic resins as long as they can efficiently dissipate the heat generated by the LED module 20.

  In the present embodiment, the main body case 30 and the cover 50 are formed in a circular shape. However, if the snap ring 70 can be locked to the cover 50, the main body case 30 and the cover 50 have, for example, a square shape. May be formed. Thereby, it becomes possible to provide the illuminating device 10 corresponding to a user's needs and use environment.

  Furthermore, in the present embodiment, the main body case 30 and the cover 50 are formed in the same shape. However, for example, the main body case 30 may be formed in a circular shape and the cover 50 may be formed in a square shape. In other words, the shape of the cover 50 is arbitrary as long as the cover 50 restricts the axial movement of the outer lens 60 and the like by the snap ring 70.

  In the present embodiment, the lighting device 10 is attached to the ceiling or wall of a vehicle or building and used as a “downlight”. However, the lighting device 10 is attached to the floor of a vehicle or building. It may be used as “upright (ground upright)”. In this case, the same effect as described above can be obtained.

  Moreover, in this embodiment, although the LED module 20 was used as a light source of the illuminating device 10, you may use light sources other than a light emitting diode, for example, an incandescent lamp. In this case, the same effect as described above can be obtained.

DESCRIPTION OF SYMBOLS 10 ... Illuminating device 20 ... LED module (light source)
DESCRIPTION OF SYMBOLS 30 ... Main body case 30a ... Opening part 50 ... Cover 50a ... Window part 52 ... Window frame 53 ... Cover peripheral wall (peripheral wall)
54 ... Circumferential groove 60 ... Outer lens (translucent plate)
62 ... Diffuse lens (translucent plate)
70, 70 ', 170 ... snap ring (annular locking member)
71, 171 ... Ends (C-shaped ends)
72, 172 ... central part 175 ... convex part (pressing part)
80 ... Nonwoven fabric (buffer member)
d1... Inner diameter (outermost diameter of circumferential groove)
d2 ... Inner diameter (inner diameter of peripheral wall)
d3 ... Free outer diameter (outer diameter in free state)
d3 '... Reduced diameter outer diameter

Claims (5)

A light source;
A main body case having an opening and accommodating the light source therein;
A window frame that forms a window part capable of emitting light emitted from the light source, and a peripheral wall formed on an outer periphery of the window frame, covers the opening of the main body case, and the window frame on the inner side of the peripheral wall A cover having a circumferential groove at a predetermined position in a direction away from
A light-transmitting plate that covers the window portion from the inside of the cover having a thickness that is approximately the same as the size of the interval from the window frame to the predetermined position;
An annular locking member that is formed in a C shape and has an outer diameter in a free state that is equal to or greater than an outermost outer diameter of the peripheral groove of the cover and is elastically deformable radially inward to an outer diameter smaller than the inner diameter of the peripheral wall ,
And the annular locking member engages with the circumferential groove to hold the translucent plate on the cover.   The annular locking member has a thin plate shape that gradually increases in width from both ends of the C-shape toward the center, and the C is larger than the opening diameter of the window when engaged with the circumferential groove. The illumination device according to claim 1, wherein the inner diameter of the letter shape is large.   The lighting device according to claim 2, wherein the annular locking member has a width of a central portion thereof that is approximately twice or more and three times or less of a width of both end portions.   4. A buffer member is interposed between the window frame of the cover and the translucent plate, or between the translucent plate and the annular locking member. The lighting device according to claim 1.   The lighting device according to claim 2, wherein the annular locking member has a pressing portion that presses the light-transmitting plate in a window frame direction of the cover.

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