JP2015002118A - Illumination lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple illumination lamp which, when assembling a heat sink and a globe, does not require an adhesive agent even when connection structures of these are small components with each other, and which does not require complicated connection structures, either.SOLUTION: An illumination lamp 10 includes: a heat sink 20 in which one end of a cylinder for accommodating a light emitting substrate 40 mounting a light emitting element 41 is open; and a translucent globe 30 for covering the opening of the heat sink 20. The illumination lamp has: screwing parts 22, 32 which screw peripheral surfaces with each other formed at opening end parts 23, 31 where the heat sink 20 and the globe 30 are overlapped, and in which one is made to be a male screw 22a and the other is made to be a female thread 32a; a fitting part 70 which is provided in a circumferential direction of an end surface 23a of the opening end part 23 of the heat sink 20; and an engagement part 34 which is protrusively provided at an opening end surface 33 of the globe 30 and which elastically deforms while sliding with the end surface 23a of the heat sink 20.

Description

  The present invention relates to an illumination lamp using a light emitting element such as an LED as a light source, and more particularly to an illumination lamp having a good heat sink and glove assembly property even if it is small.

  In recent years, this type of illumination lamp includes a cylindrical heat sink that houses a light emitting element such as an LED, and a translucent globe that covers the opening side of the heat sink. It is known that the heat sink and the globe are assembled using an adhesive. However, in this case, it takes time to apply and solidify the adhesive for assembling, and it takes time for the bonding work. In addition, there is a fitting structure in which a gutter-like insertion piece is provided at the opening end of the globe and this is fitted into the heat sink, but in this case also, an adhesive is required for the groove portion that is the fitting portion. (For example, refer to Patent Document 1).

  In addition, a claw is extended to the glove side, a claw locking portion is provided on the heat sink side corresponding to this claw, and the claw of the glove is locked to the claw locking portion of the heat sink so that both are connected The structure is also known. However, a small illumination lamp needs to provide a connection structure in a limited small space, and the entire shape including the connection structure is complicated.

  Also, there is known an example in which a glove is screwed into a screw groove of a heat sink (see, for example, Patent Document 2). In this case, a separate heat sink member is required, and the structure of the illumination lamp becomes complicated and simple. However, it has a problem that it is difficult to make the assembly easy.

JP 2010-205645 A International Publication Number WO2010 / 004702 Pamphlet

  Therefore, according to the present invention, when assembling the heat sink and the globe, even if these connecting structures are small parts, no adhesive is required, and no complicated connecting structure is required, so that the mounting can be simply and easily assembled. An object is to provide a lighting lamp with high performance.

The invention described in claim 1 is provided with “a heat sink 20 having a cylindrical end opened to accommodate the light emitting substrate 40 on which the light emitting element 41 is mounted, and a translucent glove 30 covering the opening of the heat sink 20. An illumination lamp 10,
Screwed portions 22, 32 for screwing the peripheral surfaces of the open ends 23, 31 where the heat sink 20 and the globe 30 overlap each other with one male screw 22a and the other a female screw 32a;
A fitting portion 70 provided with a plurality of engaging recesses in the circumferential direction of the end surface 23a at the opening end portion 23 of the heat sink 20;
The illumination lamp 10 includes an engaging portion 34 that protrudes from the opening end surface 33 of the globe 30 and faces the fitting portion 70 and elastically deforms while being in sliding contact with the end surface 23a of the heat sink 20. It is.

  The invention described in claim 2 relates to the illumination lamp 10 described in claim 1, “The fitting portion 70 is an opening end portion 23 of the heat sink 20 on the outer peripheral surface thereof and in the axial direction of the heat sink 20. A plurality of fins 24 protruding in multiple rows are provided, and the grooves 24c formed between the fins 24 or a plurality of recesses 23b recessed in the circumferential direction of the end surface 23a of the heat sink 20 are characterized. " And

  The invention described in claim 3 relates to the illumination lamp 10 described in claim 1 or 2, “at least one of the end surface 23 a of the heat sink 20 and the end surface 24 a of the fin 24 that are opposed to the engaging portion 34 in the axial direction. On the other hand, a non-slip portion 29 having a rough surface is formed.

  The invention described in claim 4 relates to the illumination lamp 10 described in claims 1 to 3, “The engagement portion 34 is on the fastening rotation direction side where the globe 30 is screwed to the heat sink 20 and fastened. The front surface 35 of the engaging portion 34 is an inclined surface 35 a having an obtuse angle θ1 that rises smoothly from the opening end surface 33 of the globe 30, and the rear surface 36 of the engaging portion 34 is abrupt from the opening end surface 33 of the globe 30. The engaging surface 36a has a right angle or an acute angle θ2 rising at an angle ”(see FIG. 4).

  The invention described in claim 5 relates to the illumination lamp 10 described in claims 1 to 4, wherein “the outer peripheral edge of the light emitting substrate 40 on which the light emitting element 41 is mounted between the opposed surfaces of the heat sink 20 and the globe 30. It is characterized by having a clamping part 28 for clamping the part 42 ".

  According to the first and second aspects of the invention, when the threaded portion 32 of the globe 30 is applied to the threaded portion 22 of the heat sink 20 and the globe 30 is rotated in the fastening direction, the globe 30 is accompanied by the threading operation. The engaging part 34 comes into strong contact with the end face 23 a of the heat sink 20. At this time, the reaction force from the end surface 23a is applied in the axial direction of the globe 30 to increase the contact pressure between the screwing portions 22 and 32, and the globe 30 screwed to the heat sink 20 is firmly fixed. Therefore, an adhesive or a connecting nail is not required, and it can be attached with a simple configuration and only by a screwing operation. Further, since the engaging portion 34 used here can be elastically deformed, there is no risk of damage such as chipping or cracking even when a strong contact pressure is applied during screwing, and the applied pressure can be stably transmitted in a flexible manner. It is possible to secure the durability of the engaging portion 34 that protrudes. Furthermore, since the outer shape of the assembled heat sink 20 and globe 30 is a smart and simple small illumination lamp 10, it can be mounted in a compact form even in places where the installation space is limited. It becomes possible.

  Furthermore, since the end surface 23a of the heat sink 20 is provided with a fitting portion 70 such as an engagement recess in the circumferential direction, even if the glove 30 may be loosened after assembly, that is, the engagement portion 34 is anti-fastened. The engaging portion 34 that has been compressed when it deviates in the rotational direction returns to its original shape and fits into the fitting portion 70 to restrict movement in the anti-fastening rotational direction. Will not come off.

  According to the third aspect of the present invention, since the non-slip portion 29 having a rough surface is formed on the end surface 24a of the fin 24, the contact resistance with the engaging portion 34 can be increased. Therefore, the fastening action is enhanced at the completion of fastening with the globe 30 screwed to the heat sink 20, and the globe 30 attached to the heat sink 20 is not likely to loosen. Further, the anti-slip portion 29 is not limited to the end surface 24a of the fin 24, and may be formed in the same manner on the end surface 23a of the heat sink 20 and the contact surface of the engaging portion 34 to obtain an anti-slip action.

  According to the invention described in claim 4, the front surface 35 of the engaging portion 34 formed as the inclined surface 35 a having the obtuse angle θ <b> 1 contacts the fitting portion 70 at the time immediately before the completion of tightening in which the globe 30 is screwed to the heat sink 20. When it is screwed in, it smoothly rides, and when it is further tightened, in the axial direction at the time of completion of tightening, the engaging portion 34 strongly contacts the end surface 23a with the screwed portions 22 and 32 being screwed in as a base point. The heat sink 20 and the globe 30 are firmly connected. When the globe 30 is slightly rotated in the loosening direction after connection, the engagement portion 34 is fitted into the fitting portion 70 of the end surface 23a on the rear surface 36 side at a point deviated from the end surface 23a that has been in contact with the rotation. Will be regulated and no further loosening will occur.

  According to the fifth aspect of the present invention, the light emitting substrate 40 can be interposed between the heat sink 20 and the globe 30 by using the tightening force in the screw structure. Therefore, the light emitting substrate 40 can be simply incorporated as a single unit without requiring mounting screws. Furthermore, if the fins 24 are provided near the sandwiching portion 28 that sandwiches the light emitting substrate 40 between the heat sink 20 and the globe 30, the heat generated from the light emitting elements 41 via the light emitting substrate 40 is transferred to the fins 24 of the heat sink 20. Can be efficiently transmitted to and released.

It is a perspective view which shows the illumination lamp of this invention. It is a perspective view which shows the inner side of the heat sink and globe of the illumination lamp of this invention. It is a longitudinal cross-sectional perspective view which expands and shows the internal structure and screwing part of the illumination lamp of this invention. It is a front view which expands and shows the glove of this invention and its latching | locking part. It is a front view which expands and shows the use condition of the latching | locking part of this invention, and its latching | locking part. It is a longitudinal cross-sectional view which shows the clamping state of the other Example by which the light emission board | substrate of this invention is clamped. It is a perspective view which shows the other Example of the heat sink corresponding to the glove | globe of this invention. (A) is a main part longitudinal sectional view showing a state where the locking portion of the present invention is in strong contact with the end surface, and (B) shows a state when the locking portion of the present invention passes through the recess in the fastening rotation direction. FIG. 4C is a main part longitudinal cross-sectional view, and FIG. 3C is a main part vertical cross-sectional view showing a state where the locking part of the present invention is prevented from loosening and returning after fastening.

  The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an illumination lamp 10 according to the present invention. As shown in FIGS. 2 and 3, this illumination lamp 10 is a combination of heat sink 20, globe 30, light emitting substrate 40, and socket part 50. Configured.

  As shown also in the lower side of FIG. 2, the heat sink 20 uses a metal material having good thermal conductivity, such as aluminum, and has an upper end provided in a cylindrical shape. A male screw 22a to be a screwed portion 22 on the heat sink 20 side is formed. In order to facilitate engagement during screwing, the male screw 22a is formed in half in a circumferential direction with a length shorter than a half circumference.

  Further, fins 24 are formed on the outer peripheral surface immediately below the screwing portion 22 so as to protrude in multiple rows in the axial direction of the heat sink 20. These fins 24 are arranged by equally dividing the same shape in the circumferential direction.

  The fin 24 has a vertically long upper end surface 24 a that has a substantially horizontal quadrilateral shape, is formed to protrude from the outer peripheral surface of the heat sink 20, and has an inverted triangular shape when viewed from the side so that the lower end is flush with the outer peripheral surface of the heat sink 20. It has a shape and is formed to protrude. Further, the fin 24 is formed so that the circumferential width and the width of the groove formed between the fins 24, that is, the length of the fitting portion 70 (groove portion 24c) are substantially the same. And the end surface 24a of this fin 24 respond | corresponds with the engaging part 34 of the globe 30 mentioned later.

  Further, the end surface 24a of the fin 24 may be a flat surface, but if the surface roughness of the end surface 24a of the fin 24 is increased as shown in FIG. 2, the contact resistance with the engaging portion 34 facing the fin 24 is increased. It is preferable that the end surface 24a of the fin 24 is provided roughly because it enhances the integration. For example, a non-slip portion 29 having a rough surface formed by forming a plurality of fine sawtooth V grooves in the end surface 24a of the fin 24 in a direction orthogonal to the circumferential direction, in other words, in the radial direction is formed. deep. If the anti-slip portion 29 is formed, the contact resistance in the reverse rotation direction of the globe 30 is increased, and the loosening prevention performance of the globe 30 is further enhanced.

  Further, as shown in FIG. 3, a stepped locking step portion 25 for attaching the light emitting substrate 40 is formed on the inner peripheral side of the opening end portion 23 of the heat sink 20. The locking step portion 25 is a step portion in which the inner peripheral surface side of the upper end outer peripheral surface 21 is cut out to have an L-shaped cross section, and the corner portion on the lower outer periphery of the light emitting substrate 40 is closely attached. Further, the opening end portion 23 of the heat sink 20 has a sufficiently large internal space around it in consideration of heat generation when the light emitting substrate 40 is attached. Further, a through hole 27 for introducing a wiring that is electrically connected to the light emitting substrate 40 is formed in the inner bottom plate 26.

  The globe 30 is made of a translucent resin material that slightly covers the opening end 23 of the heat sink 20 in a hemispherical shape, and the opening end 31 of the globe 30 has a large diameter and a large thickness. A female screw 32 a is formed on the inner peripheral surface of the opening end 31 to serve as a threaded portion 32 on the globe 30 side. The heat sink 20 and the globe 30 are connected to each other by screwing the threaded portions 22 and 32 formed on the open end portions 23 and 31 where the globe 30 overlaps, that is, the male screw 22a and the female screw 32a. Further, the opening end surface 33 of the globe 30 is provided with an outer diameter having a size facing the end surface 24a of the fin 24 of the lower heat sink 20 from above, and further projects downward from the opening end surface 33 of the globe 30. A joint portion 34 is projected.

  As shown in FIG. 4, the engaging portion 34 is provided so as to slightly protrude in a trapezoidal shape or the like on the opening end surface 33 of the globe 30. The engaging portion 34 is integrally formed at the time of resin molding of the globe 30. It is to be provided. That is, the material is the same as that of the globe 30, and the engaging portion 34 may be a material that does not greatly deform during pressurization and elastically deforms to such an extent that the pressurization function is not impaired. A resin material such as polypropylene may be used.

  The specific shape of the engaging portion 34 is such that the front surface 35 that is the front rising surface on the side of the fastening rotation direction where the globe 30 is screwed and fastened to the heat sink 20 is smoothly inclined from the opening end surface 33 of the globe 30. An inclined surface 35a having an obtuse angle θ1 that rises and a rear surface 36 that is a rear rising surface on the fastening rotation direction side of the engaging portion 34 is a locking surface having a right angle or an acute angle θ2 that rises at an acute angle from the opening end surface 33 of the globe 30. 36a.

  As shown in FIG. 4, the surface that connects the front surface 35 and the rear surface 36 horizontally is a contact surface 34a that contacts the end surface 24a of the fin 24 substantially horizontally, and the surface roughness of the contact surface 34a is rough. Thus, the contact resistance with the end surface 24a of the fin 24 may be further increased.

  Further, the engaging portion 34 is configured to increase the contact pressure to the maximum and stop the rotation at the time of completion of the tightening contact with the fin 24, and to increase the contact pressure in the height direction of the engaging portion 34. In order to obtain the function, as shown in FIG. 4, a sufficient contact pressure can be obtained only by setting the protrusion height h of the engaging portion 34 as slightly as about 0.2 mm, for example. Immediately before the glove 30 is screwed onto the heat sink 20 and the fastening is completed, the engaging portion 34 and the fin 24 start to contact from light pressure to strong pressure in the circumferential direction, but the engaging portion 34 has elasticity. Therefore, the function of the screwing portions 22 and 32 is not obstructed, and the rotation operation of the globe 30 is executed smoothly with high accuracy throughout.

  The engaging portions 34 may be provided on the entire circumference of the opening end surface 33, or may be provided by being evenly distributed in the circumferential direction. In this embodiment, three engaging portions 34 having the same shape are formed to protrude at a constant pitch at three positions on both the left and right sides that differ by 180 degrees in the circumferential direction. Further, the engaging portions 34 are formed so that the circumferential pitch is the same pitch (interval) as the circumferential pitch of the end surfaces 24 a of the fins 24. Accordingly, when the globe 30 is rotated, each engaging portion 34 comes into contact with each fin 24 at the same timing.

  Further, the opening end 31 of the globe 30 is formed with a locking lower surface 37 that is cut out in an inverted L shape for attaching the light emitting substrate 40 to the inner peripheral surface above the screwing portion 32. The engaging lower surface 37 and the engaging step portion 25 of the heat sink 20 described above, and the inner peripheral corner portion 25a and the notched step portion 43 described later constitute a holding portion 28 for holding the light emitting substrate 40 described later from above and below. Yes.

  The light-emitting substrate 40 is a disk formed of a material such as aluminum having good thermal conductivity, in which light-emitting elements 41 (two in FIG. 3) such as LEDs are mounted in the center, and the light-emitting substrate 40 has an attachment property. For the sake of simplicity, an inverted L-shaped notch step portion 43 is formed on the outer peripheral edge portion 42 of the light emitting substrate 40 so as to be engaged with the inner peripheral corner portion 25 a of the locking step portion 25. In addition, the notch step 43 also has a clamping structure in which the light emitting substrate 40 is positioned and the close contact with the heat sink 20 is enhanced by correspondingly engaging.

  The socket unit 50 houses a power supply circuit (not shown) that supplies commercial power to the light emitting element 41 described above, and various electronic components are mounted on a printed wiring board. Therefore, the power supply circuit and the light emitting element 41 are electrically connected via a wiring (not shown). In addition, a socket 51 for connecting to an external power source is provided at the lower end.

  When assembling the illuminating lamp 10 configured as described above, prior to attaching the heat sink 20 and the globe 30, first, the light emitting substrate 40 is attached to the locking step 25 as shown in FIG. 3 at the opening end 23 of the heat sink 20. The light emitting substrate 40 is mounted so as to place the outer peripheral edge 42 thereof. At this time, the notched step portion 43 of the light emitting substrate 40 is also engaged with the inner peripheral corner portion 25a of the heat sink 20, so that the light emitting substrate 40 can be mounted while accurately positioned, and the mounting workability of the light emitting substrate 40 is improved. improves.

  After the light emitting substrate 40 is mounted, if the glove 30 is rotated in the fastening direction with the screwed portion 32 of the globe 30 corresponding to the screwed portion 22 of the heat sink 20 so as to cover the upper surface of the light emitting substrate 40, the screwing is performed. The male screw 22a and the female screw 32a of the parts 22 and 32 are screwed and fastened.

  At this time, until the tightening is completed, as shown in the upper enlarged view of FIG. 5, the engaging portion 34 protruding downward of the globe 30 is the upper surface of the fin 24, and the end surface 24 a is formed flat. Although it is not pressed strongly, it rotates, but immediately before the completion of fastening, the engaging portion 34 gradually comes into strong contact with the end surface 24a of the fin 24. At this time, the front surface 35 of the engaging portion 34 is an inclined surface 35a. Even if it touches the corner of 24, it is allowed to slide so as to ride up and can be rotated in the tightening direction. Thereafter, the tightening is completed at the stretch limit position where the engaging portion 34 is in strong contact with the end surface 24 a of the fin 24. At the time of completion of this fastening, the attachment of the globe 30 to the heat sink 20 is completed.

  After the fastening is completed, the contact pressure is increased by the engaging portion 34 and the fin 24 that are in high pressure contact with each other up and down, and the rotational resistance at the time of fastening is reduced by the strong frictional force of the screwed portions 22 and 32 generated as a reaction thereof. Get higher. Therefore, once the globe 30 is tightened, it is configured not to loosen easily not only in the fastening rotation direction but also in the anti-fastening rotation direction. Furthermore, if both the contact surface 34a of the engaging portion 34 and the end surface 24a of the fin 24 are formed into a non-slip portion 29 having fine irregularities, the anti-slip portion of the contact surface 34a of the engaging portion 34 when fastening is completed. 29 and the anti-slip portion 29 of the end surface 24a of the fin 24 are locked, so that the coupling action at the time of completion of fastening is further enhanced, and there is no possibility of loosening of the globe 30 attached to the heat sink 20. . Even if the globe 30 is loosened and slightly reversely rotated, as shown in the lower enlarged view of FIG. 5, the slightly reversely rotated engaging portion 34 is fitted into the groove portion 24c between the fins 24 and fitted. The rear surface 36 (locking surface 36a) of the engaged engaging portion 34 comes into contact with the vertical surface 24b of the fin 24, and the reverse rotation of the globe 30 is completely restricted.

  Further, when the attachment of the globe 30 to the heat sink 20 is completed, the locking lower surface 37 of the globe 30 presses the outer peripheral upper surface of the light emitting substrate 40, so that the outer peripheral edge 42 of the light emitting substrate 40 is the heat sink 20 and the globe 30. The attachment of the light emitting substrate 40 is completed simultaneously with the attachment of the globe 30. At this time, since the light emitting substrate 40 is sandwiched from above and below and is in close contact with the heat sink 20 side, the illumination lamp 10 is used and the light emitting substrate 40 generates heat by the light emitting element 41 and the like. Is efficiently transmitted to the fins 24 on the outer peripheral surface in the immediate vicinity thereof. For this reason, the illumination lamp 10 exhibits an excellent effect not only in improving assemblability but also in improving heat dissipation. Further, when the illumination lamp 10 is used, the illumination light of the light emitting element 41 emitted from the inside of the heat sink 20 passes through the hemispherical globe 30 and outputs uniform light emission.

  FIG. 6 shows another example of the sandwiching configuration of the light emitting substrate 40. The upper end surface of the upper end outer peripheral surface 21 of the heat sink 20 is defined as a locking upper surface 21a, and the locking upper surface 21a and the locking lower surface 37 of the globe 30 described above. Between the opposing surfaces in the vertical direction is a sandwiching space 61 of the light emitting substrate 40, and the sandwiching space 61 is sandwiched from above and below with an outer peripheral edge portion 42 of the light emitting substrate 40 interposed therebetween. Also in this case, in order to facilitate attachment of the light emitting substrate 40, an inverted L-shaped notch step portion 43 is formed on the lower surface of the outer peripheral edge portion 42 of the light emitting substrate 40, and the light emitting substrate is formed by these sandwiching structures. Forty pinching portions 28 are formed. Therefore, in addition to the outer peripheral edge portion 42 of the light emitting substrate 40, the notch step portion 43 is also engaged with the sandwiching portion 28 so as to improve the positioning of the light emitting substrate 40 and the adhesion to the heat sink 20. Also at this time, the light emitting substrate 40 can be held in conjunction with the screwing operation of the globe 30. In particular, since the holding force in the vertical direction when the globe 30 is screwed is held in a state where the globe 30, the light emitting substrate 40, and the heat sink 20 are stacked in the same vertical direction from above, the light emitting substrate 40 has a structure. On the other hand, a stable clamping force can be obtained, and the clamping space 61 does not take up a space where three members overlap in the radial direction so as to increase the thickness of the heat sink 20 in the radial direction. The thickness of the heat sink 20 can be reduced as compared with the configuration of the three clamping portions 28.

  FIG. 7 shows another embodiment of the heat sink 20. The heat sink 20 is provided with a recess 23b as an alternative to the uneven structure (engagement recess, in other words, the groove 24c) of the fin 24 described in the above embodiment. Since the other points are the same and other configurations are the same, the same description is omitted with the same reference numerals, and only different points will be described.

  As shown in the lower side of FIG. 7, the heat sink 20 having the recess 23 b includes an upper cylindrical portion 71 formed with an outwardly smooth convex curved surface and a lower tubular portion formed in a lower portion thereof. The cylindrical portion 72 is integrated. The upper cylinder portion 71 is open at the top, and a horizontal annular end surface 23a is provided on the upper surface of the outer peripheral portion of the opening end portion 23 (the portion where the fins 24 are formed in the above-described embodiment). The end surface 23a is provided with a large number of recesses 23b serving as fitting portions 70, which are equally divided in the circumferential direction at portions where the fins 24 are formed.

  The recess 23b formed here has a size and depth at which the engaging portion 34 fits in a circumferential position facing the engaging portion 34, and is opened in a square shape in plan view. In this embodiment, the concave front surface 73 and the concave rear surface 74 that are on the fastening rotation direction side of the globe 30 are both formed as vertical surfaces. That is, the recess 23b corresponds to the groove 24c between the fins 24 shown in the previous embodiment.

  Although FIG. 7 shows an example of the heat sink 20 without the fins 24, the fins 24 may be formed at positions where there is no hindrance in the recesses 23b so as to improve heat dissipation. In addition, the lower cylinder part 72 of the heat sink 20 is connected to the socket part 50 at the lower side in the same manner as the above-described embodiment, and is provided with a connection structure (not shown).

  Even when the heat sink 20 configured as described above is used, if the screw part 32 of the globe 30 is applied to the screw part 22 of the heat sink 20 and the glove 30 is rotated in the fastening direction, the male screws of the screw parts 22 and 32 are used. 22a and the female screw 32a are screwed and fastened smoothly.

  At this time, until the tightening is completed, as shown in FIG. 7, the engaging portion 34 protruding downward on the lower surface of the globe 30 is sufficiently pressed against the flat end surface 23 a formed on the upper surface of the heat sink 20. Since there is no smooth rotation, the engaging portion 34 comes into strong contact with the end surface 23a of the heat sink 20 immediately before the completion of the fastening, and at this time, the front surface 35 of the engaging portion 34 is an inclined surface 35a. As shown in (B), even if the upper surface 23c of the recess 73 comes into contact, the engaging portion 34 slides and rotates so as to ride on the upper surface 23c while being elastically deformed by compression. Thereafter, as shown by an imaginary line in FIG. 8B, the fastening is completed when the engaging portion 34 reaches the tension limit position where it is most strongly in contact with the end surface 23a of the heat sink 20. At the completion of this fastening, the attachment of the globe 30 to the heat sink 20 is completed (see FIG. 8A).

  If the glove 30 is to be loosened due to long-term use after the glove 30 is attached, the engaging portion 34 is displaced from the end surface 23a that has been in contact so far and is fitted into the recess 23c in the anti-fastening direction. At this time, the engaging portion 34 is released from the contact pressure so far and is elastically restored, and the vertical rear surface 36 of the engaging portion 34 fitted in contact with the vertical recess rear surface 74 of the recess 23b is loosened. Directional rotation is restricted, and no further loosening occurs. Therefore, the glove 30 does not loosen and come off after assembly. In this case as well, not only the mounting structure and mounting workability of the globe 30 can be simplified, but also a connection with high mounting reliability can be secured.

  As described above, the glove 30 that is screwed to the heat sink 20 is provided with the small engaging portion 34, and the engaging portion 34 contacts the end surface 24 a of the fin 24 provided on the outer peripheral surface of the heat sink 20 or the end surface 23 a of the heat sink 20. The reaction force from the heat sink 20 side when contacted is applied in the axial direction, increasing the contact pressure in the axial direction between the screwed portions 22, 32 and the end faces 23 a, 24 a of the heat sink 20 to increase the heat sink 20 and the globe 30. Can be firmly fixed. Even in a place where the installation space is limited, it can be attached as a small illumination lamp 10 having a simple shape. In particular, the heat sink 20 and the globe are interlocked with the screwing operation of the globe 30. It is possible to efficiently increase the fastening force to the glove 30, and it is possible to easily attach the glove 30 while having a highly reliable attachment function between the heat sink 20 and the glove 30.

DESCRIPTION OF SYMBOLS 10 ... Illuminating lamp 20 ... Heat sink 21 ... Upper end outer peripheral surface 22 ... Screwing part 22a ... Male screw 23 ... Opening end part 23a ... End face of heat sink 23b ... Recess 23c ... Upper corner part 24 ... Fin 24a ... End face of fin 24b ... Vertical surface 24c ... Groove portion 25 ... Locking step portion 25a ... Inner peripheral corner portion 26 ... Bottom plate 27 ... Through hole 28 ... Clamping portion 29 ... Non-slip portion 30 ... Globe 31 ... Open end portion 32 ... Screwed portion 32a ... Female screw 33 ... Open end surface 34 ... Engagement portion 34a ... Contact surface 35 ... Front surface 35a ... Inclined surface 36 ... Rear surface 36a ... Locking surface 37 ... Locking bottom surface 40 ... Light emitting substrate 41 ... Light emitting element 42 ... Outer peripheral edge 43 ... Notch Step part 50 ... Socket part 51 ... Socket 61 ... Clamping space 70 ... Fitting part 71 ... Upper cylinder part 72 ... Lower cylinder part 73 ... Front of recess 74 ... Back face of recess θ1 ... Oblique angle
θ2: Vertical or acute angle h: Projection height

Claims (5)

An illumination lamp provided with a heat sink having a cylindrical end opened to accommodate a light emitting substrate on which a light emitting element is mounted, and a translucent glove covering the opening of the heat sink,
A screwed portion for screwing together the peripheral surfaces of the heat sink and the globe that are formed at the opening end where one of the external threads is the male screw and the other is the female screw;
A fitting portion provided with a plurality of engaging recesses in the circumferential direction of the end face at the opening end of the heat sink;
An illumination lamp, comprising: an engaging portion that protrudes from an opening end surface of the globe and that is elastically deformed while being in sliding contact with the end surface of the heat sink, facing the fitting portion.   The fitting portion is provided with fins projecting in multiple rows in the axial direction of the heat sink on the outer peripheral surface of the opening end portion of the heat sink, and a groove formed between the fins or an end surface of the heat sink. The illumination lamp according to claim 1, comprising a plurality of recesses recessed in the circumferential direction.   3. The illumination lamp according to claim 1, wherein a non-slip portion having a rough surface is formed on at least one of an end surface of the heat sink and an end surface of the fin that are opposed to the engaging portion in the axial direction. .   The engaging portion has an obtuse inclined surface that rises smoothly from the opening end surface of the globe, and the front surface of the engaging portion on the fastening rotation direction side where the globe is screwed and fastened to the heat sink. The illumination lamp according to any one of claims 1 to 3, wherein a rear surface of the engaging portion is a right-angled or acute-angled locking surface rising at an acute angle from the opening end surface of the globe.   The illumination lamp according to any one of claims 1 to 4, further comprising: a sandwiching portion that sandwiches an outer peripheral edge portion of a light emitting substrate on which the light emitting element is mounted, between opposed surfaces of the heat sink and the globe. .

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