JP2019204680A - Straight tube type illuminating device - Google Patents

Abstract

To provide a straight tube type illuminating device that connects bases and an LED board, and restrains an influence of thermal expansion and contraction of the LED board caused by heat generation of an LED, without increasing the number of components.SOLUTION: An straight tube type illuminating device 1 according to the present invention comprises: a long light source mounting board 4 on which a plurality of light source elements 41 are mounted; a cylindrical case 2 in which the light source mounting board 4 is housed, and having light diffusibility; and two bases 3 provided at both longitudinal end parts of the case 2. Between at least one base 3 of the two bases 3 and the light source mounting board 4, a connection part 5 connecting the base 3 and a longitudinal end part of the light source mounting board 4 and made of resin or elastomer is provided. A buffer part 52 for absorbing thermal expansion of the light source mounting board 4 is provided in the connection part 5.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a straight tube illumination device that uses an LED as a light source, which is mounted on a socket of a fluorescent lamp illumination fixture.

  In recent years, as an alternative to incandescent bulbs and fluorescent lamps, lighting devices using light emitting elements such as light emitting diodes (LEDs) as light sources have become widespread. As one of such illuminating devices, for example, a straight tube type LED illuminating device that is mounted on a socket of a fluorescent lamp illuminating device installed on a ceiling surface or the like as shown in Patent Document 1 or Patent Document 2 is known. ing.

  For example, Patent Document 1 discloses a straight tube lamp in which an LED substrate on which a plurality of LEDs are arranged is housed in a straight tubular cylindrical case. In order to solve the problem that the case is warped when the case is heated by the heat generated by the LED, the straight tube lamp of Patent Document 1 dissipates heat from the substrate to the opposite side of the LED mounting surface of the LED substrate. The heat dissipating member and the case are disposed between the heat dissipating member and the case so that the LED substrate is held in contact with the heat dissipating member so that the heat dissipating member and the case are not in contact with each other. Occurrence is suppressed.

JP 2013-164940 A JP 2014-232673 A

  The problem caused by the heat generation of the LED in the straight tube type lighting device that accommodates the LED substrate is not only the problem of the warp of the case proposed in Patent Document 1, but also due to the expansion and contraction of the member due to the heat, There is also a problem that the length changes. For example, in the straight tube lamp of Patent Document 1, the LED substrate, the heat insulating member, and the case are made of resin, and the heat radiating member is made of aluminum. These members thermally expand in the tube axis direction due to the heat generated by the LED. Then, the caps attached to both ends of the straight tube lamp are strongly pressed against the socket of the lighting fixture installed on the ceiling surface or the like, and the socket and the cap may be damaged. In addition, when the lamp is turned off, the length of the LED substrate or the like becomes shorter than that when the lamp is turned on due to thermal contraction, so that the base is easily detached from the socket, and the straight tube lamp itself may fall.

  In order to solve such a problem, in the straight tube type LED lamp disclosed in Patent Document 2, the base on which the light emitting module is arranged using a screw or a spring is movable relative to the base. It is configured. By adopting such a configuration, even if the base is thermally expanded and contracted in the tube axis direction due to the heat generated by the LED, the spring absorbs the change in the length of the base and prevents the change in the total length of the straight tube type LED lamp. However, there is a problem that the number of parts of the straight tube type LED lamp is increased and the structure becomes complicated.

  The present invention has been made in view of such points, and connects the base and the light source mounting substrate without increasing the number of components, and thermally expands and contracts the light source mounting substrate due to heat generation of the light source element (LED). It aims at providing the straight tube | pipe type illuminating device which implement | achieved suppressing the influence of this.

  In order to achieve the above object, the present invention provides a long light source mounting substrate on which a plurality of light source elements are mounted, a light-diffusing cylindrical case in which the light source mounting substrate is housed, Two bases provided at both ends in the longitudinal direction of the case, and between the at least one base of the two bases and the light source mounting board, the base end of the base and the light source mounting board in the longitudinal direction. A straight tube illuminating device characterized in that a connecting portion made of a resin or an elastomer is provided, and a buffer portion for absorbing thermal expansion of the light source mounting substrate is provided in the connecting portion. (Invention 1).

  According to the said invention (invention 1), by providing a buffer part in the connection part which connects a nozzle | cap | die and a light source mounting board | substrate, the thermal expansion of the light source mounting board | substrate by the heat_generation | fever of a light source element is used, without using another members, such as a spring. Since the absorbing mechanism can be realized, it is possible to suppress the influence of thermal expansion and contraction of the light source mounting board due to heat generation of the heating element without increasing the number of components.

  In the said invention (invention 1), it is preferable that the said buffer part is comprised so that it may deform | transform when the said light source mounting board | substrate pushes the said connection part in a longitudinal direction by thermal expansion (invention 2).

  In the said invention (invention 1 and 2), the said buffer part is provided between the board | substrate connection part connected with the longitudinal direction edge part of the said light source mounting board | substrate, and the nozzle | cap | die connection part connected with the said nozzle | cap | die. (Invention 3)

  In the said invention (invention 3), it is preferable that the said board | substrate connection part has a holding groove which clamps the longitudinal direction edge part of the said light source mounting board | substrate (invention 4), and in the said invention (invention 4), Either one of the holding groove and the longitudinal end of the light source mounting substrate is provided with a protrusion, and the other is preferably provided with a fitting hole into which the protrusion is fitted (invention). 5).

  According to the above inventions (Inventions 4 and 5), a fastening member such as a screw is not required separately for connection between the light source mounting substrate and the connection portion, so that the number of parts is not increased and the assembly work is simplified. Can do.

  In the said invention (invention 1-5), the said nozzle | cap | die has resin-made base bodies, the said connection part may be formed integrally with the said base body (invention 6), and the said connection part is the said. One connecting member independent of the base and the light source mounting substrate may be used (invention 7).

  In the said invention (invention 7), the substantially cylindrical-shaped protrusion part is provided in the edge part by the side of the said base of the said connection member, The insertion hole in which the said protrusion part is inserted is provided in the said base. (Invention 8) Preferably, in the above invention (Invention 8), the projecting portion is provided with a fitting claw at the periphery of the end on the base side, and the base side of the projecting portion It is preferable that a groove is cut so that the end portion of the insertion hole is divided into two semi-cylindrical shapes, and a fitting recess into which the fitting claw is fitted is provided on the inner wall of the insertion hole (invention). 9).

  According to the said invention (invention 8 and 9), since fastening members, such as a screw, are not separately required for connection with a nozzle | cap | die and a connection member, an assembly operation can be simplified without increasing a number of parts. .

  In the above inventions (Inventions 8 and 9), at least one engaging piece is provided on a side portion of the protruding portion, and an engaging groove for engaging the engaging piece is provided on the base. It is preferable (Invention 10).

  According to the said invention (invention 10), when the protrusion part of a connection member is inserted in the insertion hole of a nozzle | cap | die, and a nozzle | cap | die and a connection member are connected, the engagement piece of a connection member engages with the engagement groove | channel of a nozzle | cap | die. By doing so, the connecting member does not rotate with respect to the base, so that the position in the rotation direction of the connecting member and the light source mounting substrate connected to the connecting member can be regulated.

  According to the straight tube illumination device of the present invention, the base and the light source mounting board are connected without increasing the number of components, and the influence of the thermal expansion and contraction of the light source mounting board due to the heat generation of the light source element is realized. it can.

It is a perspective view which shows the external appearance of the straight tube | pipe type illuminating device which concerns on one Embodiment of this invention. It is a perspective view (the 1) which shows an internal structure in the state which removed the case from the straight tube | pipe type illuminating device which concerns on the embodiment. It is a perspective view (the 2) which shows an internal structure in the state which removed the case from the straight tube | pipe type illuminating device which concerns on the same embodiment. It is a disassembled perspective view which shows the internal structure of the straight tube | pipe type illuminating device which concerns on the same embodiment. It is sectional drawing which shows the structure of the case of the straight tube | pipe type illuminating device which concerns on the same embodiment. It is explanatory drawing which shows the structure of the connection part of the connection member of a straight tube | pipe type illuminating device which concerns on the embodiment, and a nozzle | cap | die, (a) is side sectional drawing of the said connection part, (b) is a plane cross section of the said connection part. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an appearance of a straight tube illumination device 1 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an internal structure of the straight tube illumination device 1 with a case 2 removed. 3 is a view of the straight tube illumination device 1 with the case 2 removed from the opposite side of FIG. 2, and FIG. 4 is an exploded view of the internal structure of the straight tube illumination device 1 for each member. It is shown. As shown in FIGS. 1 to 4, the straight tube illumination device 1 has an external shape in which two bases 3 are attached to both ends in the longitudinal direction of a substantially cylindrical long case 2. 2 includes a long LED mounting substrate 4 on which a plurality of LEDs 41 are mounted. The base 3 and the LED mounting substrate 4 are connected by a connecting member 5 arranged therebetween.

  As shown in FIG. 2, the case 2 is configured to accommodate an LED mounting board 4, a power supply board (not shown), a connection cable, a connector (not shown) and the like, and has diffuse transmission / diffuse reflectivity. It is molded from a resin such as polycarbonate (or acrylic). In case 2, only the side of LED mounting substrate 4 that is irradiated with light from LED 41 is molded with a resin having diffuse transmission / diffuse reflectivity so that the inside of the side opposite to the side irradiated with light from LED 41 cannot be seen. You may shape | mold with the colored opaque resin.

  As shown in FIG. 5, the case 2 is a long cylindrical member having a substantially circular shape in cross section, and four rails 21 a, 21 b, 21 c, and 21 d are arranged along the longitudinal direction of the case 2 on the inner wall thereof. And formed over the entire length. The two rails 21a and 21b and the two rails 21c and 21d are formed between the board insertion groove 22a formed between the two rails 21a and 21b and the two rails 21c and 21d. The substrate insertion grooves 22b are arranged so as to face each other.

  The base 3 is attached and fixed to the longitudinal end of the case 2. The base 3 has a structure in which a pair of base pins 32 are provided through a base body 31 made of resin such as polycarbonate. The base pin 32 is configured so that electric power is supplied through a terminal (not shown) of a socket of a lighting fixture to which the straight tube type lighting device 1 is attached, and a power source is connected via a connection cable (not shown). It is connected to a substrate (not shown).

  As shown in FIG. 4, a reduced diameter portion 33 having a slightly smaller diameter is formed on the base 2 side of the base body 31, and the reduced diameter portion 33 is inserted into the longitudinal end of the case 2. A base 3 is attached to the case 2. The reduced diameter portion 33 is provided with two case fixing grooves 34 into which the four rails 21a, 21b, 21c, and 21d formed in the case 2 are fitted when the base 3 is attached to the case 2. Yes.

  In the center of the base body 31, an insertion hole 35 into which a protrusion 53 of the connecting member 5 described later is inserted is provided, and the inner wall of the insertion hole 35 is described later as shown in FIG. A fitting recess 351 is formed in which a fitting claw 531 formed on the peripheral edge of the protruding portion 53 of the connecting member 5 is fitted. Further, as shown in FIG. 6B, an engagement groove 36 that engages an engagement piece 54 of the connecting member 5 described later is provided inside the base body 31.

  The LED mounting substrate 4 is a long flat plate-shaped resin member, and a plurality of LEDs 41 are linearly arranged and mounted on one surface thereof. As shown in FIG. 5, both ends of the LED mounting substrate 4 in the short direction are slid into the substrate insertion grooves 22 a and 22 b formed on the inner wall of the case 2. Further, as shown in FIG. 4, a fitting hole 42 into which a protrusion 511 formed in a holding groove 51 of the connecting member 5 described later is fitted is provided at the longitudinal end of the LED mounting substrate 4. Yes.

  The connecting member 5 is a resin member such as polycarbonate, nylon, or polyacetal, and one end of the connecting member 5 is connected to the longitudinal end of the LED mounting substrate 4 as a substrate connecting portion, and the other end is connected to the base 3 as a base connecting portion. Is connected to the base 3 and the longitudinal end of the LED mounting substrate 4. An elastomer such as silicone rubber may be employed as the material of the connecting member 5. In addition, the connection member 5 in this embodiment is a member independent of the base 3 and the LED mounting substrate 4.

  The connecting member 5 has a holding groove 51 that functions as a board connecting part by holding the longitudinal end of the LED mounting board 4. In the holding groove 51, as shown in FIG. 6 (a), when the LED mounting board 4 is held in the holding groove 51, a protrusion that fits into the fitting hole 42 provided in the LED mounting board 4 511 is formed. Since the connecting member 5 has such a structure, the connection between the LED mounting substrate 4 and the connecting member 5 does not require a fastening member such as a screw, so that the number of parts is not increased, and the straight tube type Assembling work of the lighting device 1 can be simplified.

  The connecting member 5 has a substantially cylindrical protruding portion 53 that functions as a base connecting portion by being inserted into an insertion hole 35 provided in the base 3. A fitting claw 531 is provided on the periphery of the end of the protrusion 53 on the base 3 side, and a groove 532 is formed in the protrusion 53 so that the end on the base 3 side is divided into two semicylindrical shapes. It is cut. When the protruding portion 53 of the connecting member 5 is inserted into the insertion hole 35 of the base 3, the protruding portion 53 moves into the insertion hole 35 even if the fitting claw 531 is formed in the protruding portion 53 due to the presence of the groove 532. When the fitting claw 531 reaches the fitting recess 351 formed on the inner wall of the insertion hole 35, the fitting claw 531 is fitted into the fitting recess 351, and the base 3 and the connecting member 5 are connected. Connected. Since the connecting member 5 has such a structure, a fastening member such as a screw is not required for connecting the base 3 and the connecting member 5, so that the number of parts is not increased, and the straight tube illumination device 1 assembly work can be simplified.

  Further, at least one engaging piece 54 is provided on the side of the protruding portion 53 of the connecting member 5. When the protrusion 53 of the connecting member 5 is inserted into the insertion hole 35 of the base 3, the engagement piece 54 engages with the engagement groove 36 provided in the base 3. Since the engaging piece 54 of the connecting member 5 engages with the engaging groove 36 of the base 3 in this way, the connecting member 5 does not rotate with respect to the base 3, so that the connecting member 5 and the connecting member 5 The position of the connected LED mounting substrate 4 in the rotation direction can be regulated.

  The connecting member 5 is provided with a buffer portion 52 that absorbs thermal expansion of the LED mounting substrate 4 caused by the heat generated by the LED 41 between the holding groove 51 that is the substrate connecting portion and the protruding portion 53 that is the base connecting portion. Yes. The buffer portion 52 in the present embodiment has a substantially elliptic cylindrical shape, and is provided so that the direction orthogonal to the tube axis direction of the straight tube illumination device 1 matches the tube axis direction of the buffer portion 52. Yes. If such a buffer part 52 is provided, when the LED mounting substrate 4 pushes the connecting member 5 in the longitudinal direction by thermal expansion, the buffer part 52 of the connecting member 5 is deformed, and the entire length of the connecting member 5 (straight tube illumination) By shortening the length of the device 1 in the tube axis direction, the connecting member 5 can absorb the thermal expansion of the LED mounting substrate 4 caused by the heat generated by the LEDs 41.

  If the LED mounting substrate 4 is configured to be deformed when the connecting member 5 is pushed in the longitudinal direction by thermal expansion, the buffer portion 52 can absorb the thermal expansion of the LED mounting substrate 4 caused by the heat generation of the LED 41. . The buffer portion 52 does not necessarily have a substantially oval cylindrical shape, and other shapes such as a substantially regular cylindrical shape, a polygonal cylindrical shape, a U-shaped groove shape, a V-shaped groove shape, and a bellows shape are employed. Alternatively, the deformability may be improved by using only a material of the buffer portion 52 of the connecting member 5 as a resin different from other portions by using a two-color molding technique.

  As described above, the straight tube illumination device 1 according to this embodiment includes the buffer portion 52 in the connecting member 5 that connects the base 3 and the LED mounting substrate 4, so that the LED 41 can be used without using a separate member such as a spring. Since a mechanism that absorbs the thermal expansion of the LED mounting substrate 4 due to heat generation can be realized, the influence of thermal expansion and contraction of the LED mounting substrate 4 due to heat generation of the LED 41 can be suppressed without increasing the number of components.

  The mechanism for connecting the base 3 and the LED mounting substrate 4 using the connecting member 5 according to the present embodiment may be adopted for only one of the bases 3 that the straight tube illumination device 1 has. , May be adopted for both. If the LED mounting substrate 4 is connected to at least one of the caps 3 of the straight tube illumination device 1 by the connecting member 5, the thermal expansion of the LED mounting substrate 4 due to the heat generated by the LEDs 41 can be absorbed. Therefore, the connection between the other base 3 and the LED mounting substrate 4 may be performed by other methods.

  The straight tube illuminating device 1 according to the present embodiment does not include a heat radiating member (for example, an aluminum heat sink) that is included in a conventional straight tube illuminator. This is because the heat generation performance of the LED mounting substrate 4 itself and the heat generation of the LED 41 due to the improvement of the light emission efficiency can be suppressed. This also leads to a reduction in the number of parts of the straight tube illumination device 1. At the same time, this contributes to simplifying the assembly work of the straight tube illumination device 1. In addition, when the LED mounting substrate 4 is connected to the connecting member 5 without the heat dissipation member, the LED mounting substrate 4 may be accommodated in the case 2 with the LED being separated from the case 2 by the thickness of the heat dissipation member. Therefore, light diffusibility can also be improved.

  As mentioned above, although the straight tube | pipe type illuminating device which concerns on this invention has been demonstrated based on drawing, this invention is not limited to the said embodiment, A various change implementation is possible. For example, in the above embodiment, the connecting member 5 is a single member independent of the base 3 and the LED mounting substrate 4, but is not limited thereto, and the base body 31 and the connecting member 5 of the base 3 are the same. A single member may be formed by integrally molding a resin (polycarbonate, polybutylene terephthalate, etc.) as a material. For example, the base body 31 is made of resin such as polycarbonate or polybutylene terephthalate, and the connecting member 5 is made of resin such as nylon or polyacetal. Both may be formed as one member by a two-color molding technique.

  Moreover, in the said embodiment, although the projection part 511 was provided in the clamping groove 51 of the connection member 5, and the fitting hole 42 was provided in the LED mounting board 4, it is not restricted to this, A projection part is provided in an LED mounting board. A fitting hole may be provided in the connecting member. Various variations are conceivable for the structure for connecting the connecting member 5 and the LED mounting substrate 4 and the structure for connecting the connecting member 5 and the base 3.

DESCRIPTION OF SYMBOLS 1 Straight pipe type illuminating device 2 Case 21a, 21b, 21c, 21d Rail 22a, 22b Substrate insertion groove 3 Base 31 Base body 32 Base pin 33 Reduced diameter part 34 Case fixing groove 35 Insertion hole 351 Fitting recess 36 Engagement groove 4 LED mounting board 41 LED
42 fitting hole 5 connecting member 51 clamping groove 511 projection part 52 buffer part 53 protrusion part 531 fitting claw 532 groove 54 engagement piece

Claims (10)

A long light source mounting substrate on which a plurality of light source elements are mounted;
A cylindrical case having light diffusibility in which the light source mounting substrate is accommodated;
Two caps provided at both longitudinal ends of the case, and
Between at least one of the two caps and the light source mounting substrate, a connecting portion made of resin or elastomer that connects the base and the longitudinal end of the light source mounting substrate is provided,
The straight tube type lighting device, wherein the coupling portion is provided with a buffer portion that absorbs thermal expansion of the light source mounting substrate.   The straight tube type illumination device according to claim 1, wherein the buffer portion is configured to be deformed when the light source mounting substrate is pushed in the longitudinal direction by thermal expansion.   The said buffer part is provided between the board | substrate connection part connected with the longitudinal direction edge part of the said light source mounting board | substrate, and the nozzle | cap | die connection part connected with the said nozzle | cap | die, The Claim 1 or characterized by the above-mentioned. 2. A straight tube illumination device according to 2.   The straight tube illumination device according to claim 3, wherein the substrate connecting portion has a holding groove for holding a longitudinal end portion of the light source mounting substrate.   One of the holding groove and the longitudinal end of the light source mounting substrate is provided with a protrusion, and the other is provided with a fitting hole into which the protrusion is fitted. The straight tube illumination device according to claim 4. The base has a base body made of resin,
The straight tube illumination device according to any one of claims 1 to 5, wherein the connecting portion is formed integrally with the base body.   The straight tube illumination device according to any one of claims 1 to 5, wherein the connecting portion is one connecting member independent of the base and the light source mounting substrate. A substantially cylindrical protrusion is provided at the end of the connecting member on the base side,
The straight tube illumination device according to claim 7, wherein the base is provided with an insertion hole into which the protruding portion is inserted. The protrusion is provided with a fitting claw at the periphery of the end on the base side, and a groove is cut so that the end on the base side of the protrusion is divided into two semi-cylindrical shapes. And
The straight tube illumination device according to claim 8, wherein a fitting recess into which the fitting claw is fitted is provided on an inner wall of the insertion hole. At least one engagement piece is provided on a side portion of the protruding portion,
The straight tube illumination device according to claim 8 or 9, wherein the base is provided with an engagement groove with which the engagement piece engages.

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