JP2012138240A - Illumination source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems wherein it is technically difficult to accurately form a projecting structure for performing position control of a base where an LED is mounted on an inner wall of an elongated tubular member and it is more difficult to form the projecting structure if an inner diameter of a tube is small and the projecting structure is small and further, it is more difficult to form a convex structure on an inner wall surface of the tube if a glass material and a ceramic material are used on an outer enclosure member.SOLUTION: Hollows facing each other are arranged on an inner periphery of the tube wall cross section made by cutting the tubular member in a vertical direction against a central axis direction of the tubular member. Each hollow is continuously and linearly formed from one end of the tubular member to the other end, and the base can be controlled by being sandwiched with the hollows.

Description

  The present invention relates to an illumination light source including a light emitting element.

  Light-emitting diodes (LEDs), which are semiconductor light-emitting elements, are smaller, more efficient, and have a longer life than existing illumination light sources. There is an increasing demand for illumination sources. Although the existing illumination light source and LED have different light emission principles and completely different shapes, there is a demand for an illumination light source having an appearance similar to that of an existing illumination light source. It has been commercialized.

  In an LED illumination light source that replaces a fluorescent lamp, for example, a long cylindrical straight tube fluorescent lamp, in order to regulate the position of the base on which the LED is mounted, the inner wall of the tubular member constituting the outer shell is connected from one end to the other end. A structure has been proposed in which a protrusion extending in the longitudinal direction is provided and the position of the base is regulated by the side surface of the protrusion (see Patent Documents 1 and 2).

JP 2010-135271 A JP 2010-255103 A

  However, it is technically difficult to accurately form the protruding structure on the inner wall of the long tubular member. This is particularly noticeable when the inner diameter of the cylinder is small or when the protruding structure is small. In addition, when a glass material or a ceramic material is used for the outer member, it is more difficult to form a protruding structure on the inner wall surface.

  An object of the present invention is to provide a light source device that can easily support and assemble a base on which an LED chip is mounted inside a long tubular member without providing a protruding structure on the inner wall. is there.

  In order to solve the above-described problems, an aspect of the illumination light source according to the present invention includes a plurality of light emitting elements, a base on which the light emitting elements are mounted, and a tubular member made of a translucent material that houses the base. A tubular base member that is cut at a direction perpendicular to the central axis direction of the tubular member, and is provided with a base for receiving electric power for causing the light emitting element to emit light from outside at least at one end of the tubular member. Each of the inner walls of the tube wall section has recesses facing each other, and the recesses are formed continuously and linearly from one end of the tubular member to the other end, and the recesses are formed between the recesses. An illumination light source characterized in that the position is regulated with a base interposed therebetween.

  With this configuration, the position of the base on which the light emitting element is mounted can be regulated and supported without providing a convex structure on the inner wall of the tubular member.

  Furthermore, in one aspect of the illumination light source according to the present invention, the inner circumference of the tube wall cross section is a polygon, and the corners of the polygon are the depressions, and are positioned diagonally to each other. can do.

  With such a configuration, the position of the base can be regulated and supported using the shape of the inner wall without providing a dedicated structure for regulating and supporting the position of the base on the inner wall of the tubular member.

  Furthermore, in one aspect of the illumination light source according to the present invention, the distance between the recesses is the longest distance between the two points between any two points connecting the inner peripheries of the tube wall cross section. Can do.

  With this configuration, by setting the longest distance connecting the cross-section inner walls of the tubular member as the width of the base, it is possible to prevent movement in the direction perpendicular to the longitudinal direction of the base and to regulate the position.

  Furthermore, in one aspect of the illumination light source according to the present invention, an inner circumference of the tube wall section may be elliptical, and an arc intersecting with the major axis of the elliptical shape may be the depression.

  With such a configuration, the long axis length of the ellipse, which is the longest distance connecting the cross-section inner walls of the tubular member, is set as the width of the base, thereby preventing movement in the direction perpendicular to the longitudinal direction of the base and restricting the position. can do.

  Furthermore, in one aspect of the illumination light source according to the present invention, the side surface of the base may be in contact with the inner wall of the tubular member.

  With such a configuration, by contacting the side surface of the base with the inner wall of the tubular member, the heat of the light emitting element can be released from the tubular member to the outside through the base.

  The present invention provides means for regulating and supporting the position of a long base on which an LED is mounted without providing a protruding structure on the inner wall surface of a long cylindrical outer member. In particular, it is effective when using a glass member that is difficult to form into a projecting structure on the inner wall surface and has a small inner diameter, which is generally difficult to finely process.

The perspective view of the illumination light source which concerns on the 1st Embodiment of this invention AA sectional view for similarly explaining the internal structure of the illumination light source Similarly, a top view of the base for explaining the structure of the base of the illumination light source Similarly, a top view of the wiring board for explaining the wiring pattern of the wiring board of the illumination light source Similarly, a wiring diagram for explaining the electrical connection state of the LED chip of the illumination light source The figure explaining the state which similarly accommodates the base of an illumination light source in a tubular member The figure explaining the state which attaches a base to the tubular member of an illumination light source similarly BB sectional view for similarly explaining the structure of the base of the illumination light source The figure for demonstrating the state which similarly attached the illumination light source to the illumination light source The perspective view of the illumination light source which concerns on the 2nd Embodiment of this invention CC sectional drawing for demonstrating the structure inside an illumination light source similarly Sectional drawing for demonstrating a modification similarly The side view of the illumination light source which concerns on the 3rd Embodiment of this invention DD sectional drawing for similarly demonstrating the structure inside an illumination light source Similarly, a top view of the chip mounting board for explaining the chip mounting board of the illumination light source The side view of the illumination light source which concerns on the 4th Embodiment of this invention EE cross-sectional view for explaining the internal structure of the illumination light source

  Hereinafter, illumination light sources according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
The overall configuration of the illumination light source according to the first embodiment of the present invention will be described with reference to FIGS. The illumination light source 1 according to the first embodiment of the present invention shown in FIG. 1 includes bases 110 and 120 at both ends of a rectangular columnar tubular member 100 serving as an outer member. The tubular member 100 is made of a light-transmitting material such as polycarbonate, and as shown in FIG. 2, a long base 130 is provided inside. On the base 130, a plurality of packages 150 that house LED chips 151 that are semiconductor light emitting elements are arranged in a line in the length direction of the base 130. FIG. 2 shows a cross-sectional view obtained by cutting the illumination light source 1 of FIG. 1 in the direction perpendicular to the central axis direction (z direction) of the tubular member 100 by AA. The shapes of the inner periphery 101 and the outer periphery 102 of the tube wall cross section of the tubular member 100 are also square. In the present embodiment, for example, the tube length is 1195 mm, the diagonal distance of the square of the inner circumference 101 is 28 mm, and the diagonal distance of the square of the outer circumference 102 is 30 mm.

  The base 130 has a structure in which an aluminum plate 131 and a wiring board 132 on which a package 150 for housing the LED chip 151 is mounted are laminated via an adhesive (not shown) containing a heat conductive filler ( (See FIG. 2). The aluminum plate 131 has a thickness of 1 mm, a width of 27 mm, and a length of 1175 mm. The size of the wiring board 132 is 0.8 mm in thickness, 20 mm in width, and 145 mm in length. The wiring board 132 also includes a heat conductive filler (not shown).

  When the heat generated in the LED chip 151 is conducted to the aluminum plate 131 through the wiring board 132, the aluminum plate 131 can be soaked because it has a high thermal conductivity. Prevents high temperatures. As shown in the top view of the base 130 in FIG. 3 and FIG. 4, the surface of the wiring board 132 has a mounting pattern 133 a connected to the package 150, a wiring pattern 133 b that supplies power to the package 150, adjacent wiring boards, There are power supply terminals 134a, 134b, 134c, and 134d that are electrically connected to a cap pin to be described later. The portions other than the mounting pattern 133a and the power supply terminals 134a to 134d are covered with a white resin so as to reflect light.

  Three LED chips 151 are housed in a recess 152 of the package 150 in a state of being electrically connected in series, and each end of the LEDs connected in series is connected to a power supply terminal 154 of the package 150. The power supply terminal 154 of the package 150 is electrically and mechanically connected to the mounting pattern 133a by solder (not shown). The electrical connection state of the LED chip 151 accommodated in the illumination light source 1 is shown in FIG. A portion surrounded by a broken line 151 a is a portion showing wiring in the package 150. The package 150 is filled with a resin 153 containing a phosphor that absorbs blue light and emits other colors such as yellow light. When the power supply terminal 154 of the package is energized, white light is emitted.

  The electrical connection between the wiring boards 132 will be described with reference to FIGS. On the wiring board 132, eight packages 150 are mounted in a straight line. The package 150 is electrically connected in parallel on the wiring board 132, that is, the LED chips 151 are arranged in 3 series and 8 series. A portion surrounded by a one-dot chain line 151b in FIG. 5 corresponds to this. Eight wiring boards 132 are arranged in a straight line on the aluminum plate 131. The power supply terminals 134a and 135c, the power supply terminal 134b and the power supply terminal 135d, and the power supply terminal 134c and the power supply terminal 136a between adjacent wiring boards are arranged. The power supply terminal 134d and the power supply terminal 136b are electrically connected by cables 140a, 140b, 141a, and 141b, respectively, so that the eight wiring boards 132 are connected in series. The power supply terminals 137a and 137b on one end side of the wiring board row are electrically connected to the base pins 111a and 111b by the power supply cables 142a and 142b. By electrically connecting the power supply terminals 138c and 138d on the other end side with a return cable 143, the high-potential and low-potential power supply terminals 137a and 137b of the LED chip array in which the power supply terminals on the one end side are connected in series Become.

  In the present embodiment, an example in which only one end 137a and 137b of the power supply terminal is electrically connected to the cap pins 111a and 111b is shown, but the present invention is not limited to this. For example, the power supply terminals 137a, 137b, 138c, and 138d at both ends may be electrically connected to the cap pins 111a, 111b, 121a, and 121b at each end. In this case, eight LED rows on the wiring board 132 are connected in series. For example, the power supply terminals of the wiring board 132 located fourth and fifth from the end are electrically connected with the return wires, respectively. It is also possible to supply power independently from the caps 110 and 120 at both ends by arranging the substrates 132 in series.

  As shown in FIG. 2, there are four depressions 101 a, 101 b, 101 c, and 101 d corresponding to square corner portions on the inner periphery 101 of the tube wall cross section of the tubular member 100. The tubular member 100 supports and supports the position of the base 130 by sandwiching both side edges 131a and 131b in the longitudinal direction of the base 130 between the two depressions 101a and 101c located diagonally to the square. ing. Among two arbitrary points on the inner periphery 101 of the tube wall cross section, the distance between the two depressions positioned on the diagonal of the square is the longest distance. The width of the aluminum plate 131 of the base 130 is designed to be the same as the longest distance when the longitudinal direction of the tubular member 100 is the z-axis direction and the perpendicular directions are the x-axis and y-axis directions, respectively. Thus, the position of the base 130 in the x-axis and y-axis directions can be regulated inside the tubular member 100 and supported by the depressions 101a and 101c in the corner portions. In the present embodiment, the width of the aluminum plate 131 is 27 mm while the diagonal length of the square cross section is 28 mm. The square corner is slightly rounded, the base is 1 mm thick, the aluminum plate 131 is sandwiched between the depressions 101a and 101b in the corner, and tolerances are taken into account. The width of the aluminum plate 131 is designed to be 1 mm shorter than the diagonal length. The diagonal distance, that is, the width between the recesses 101a and 101b and the width of the base are substantially the same. For these reasons, the side edges 131a and 131b of the aluminum plate 131 are formed between the two recesses 101a and 101c. The width of the aluminum plate 131 is made shorter than the distance between the corner portions 101a and 101c within a range sandwiched between them. By chamfering both side edges 131a and 131b of the aluminum plate 131 to match the shape of the corners, the diagonal length of the square of the inner periphery 101 and the width of the base can be made closer, so the position can be regulated accurately. Can support.

  Note that an adhesive may be applied to the inner wall of the corner portion in contact with the side edge portion of the base 130 to fix them together.

  As an assembling method of the illumination light source 1, for example, a base 130 on which a package 150 is mounted and electrical connection between the wiring boards 132 is completed is inserted from one end of the tubular member 100, and guided by the above-described recesses 101a and 101b. However, the whole is accommodated (see FIG. 6). After electrical connection with the base pins 111a, b, 121a, b, the tubular member 100 is closed with the base on one end side as shown in FIG. 7, and the other end side is also closed. The bases 110 and 120 are made of a relatively flexible resin such as a PBT resin, and have a quadrangular prism shape with an opening on one side and a height of 10 mm and a diagonal length of 32 mm. The opening has a square shape when viewed from the opening side, and has a diagonal length of 30 mm. FIG. 8 shows a cross-sectional view of the base 110 taken along the line BB. Two cap pins 111a and 111b are fixed to the opening bottom portion 112 so as to protrude from both the opening bottom surface and the back side surface thereof. A fixing portion 113 for fixing the end portion of the base 130 from the bottom of the opening while the two base pins are fixed protrudes from above and below. The base 120 has the same configuration, and both ends of the tubular member 100 are closed by the bases 110 and 120, and at the same time, the base 130 is fixed in the z-axis direction. The bases 110 and 120 and the tubular member 100 are fixed with an adhesive.

  In the present embodiment, an example in which the power supply terminal of the wiring board is directly electrically connected to the base pin is shown, but the present invention is not limited to this. For example, a circuit component such as a rectifier circuit or a noise filter circuit may be electrically connected between the power supply terminal and the cap pin. These circuit components may be stored in the opening recess of the base, or may be stored in a space formed between the base and the tubular member.

  FIG. 9 shows an example in which the illumination light source 1 according to the present embodiment is attached to the luminaire 160. The illumination light source 1 is fixed by inserting a cap pin into the sockets 161 and 162. One base 110 connected to the power supply terminals 137a and 137b of the wiring board is used for feeding and fixing, and the other base 120 is used for fixing.

  In the present embodiment, the position of the base on which the LED chip is mounted is regulated and fixed inside the tubular member by using the shape of the inner wall of the tubular member without forming a protruding structure on the inner wall of the tubular member. Can do. The structure of the mold used when manufacturing the tubular member is simplified, and the mold cost can be reduced. Since the tubular member of the present embodiment is not required to have such an accuracy as to form the convex structure, the management range of the manufacturing conditions such as the manufacturing temperature and the manufacturing speed becomes moderate, and the productivity is improved. Generally, when the inner diameter of the tube is particularly small, high dimensional accuracy is required for the protruding structure. However, in the present embodiment, such a problem does not occur because there is no protruding structure on the inner wall. In addition, when glass is used for the tubular member, it is difficult to accurately form the protruding structure on the inner wall with a dimension equal to or smaller than the thickness of the tube wall. Does not occur. This is also advantageous in terms of material selection.

  Furthermore, since the base 130 is guided using the depressions 101a and 101b positioned diagonally, which is the longest opening of the tubular member 100, detailed assembly work is not required and the assembly can be easily performed.

  In the present embodiment, an example in which the shape of the inner peripheral section of the tube wall of the tubular member is a quadrangle is shown. However, the shape is not limited to this, and may be a polygon that is equal to or greater than a quadrangle. The base is also a bottomed quadrangular prism shape, but may be a bottomed cylindrical shape or the like. In this case, for example, in the case of a bottomed cylindrical shape, a gap is formed between the quadrangular columnar tubular member and the base, but it may be configured to be closed. A cap pin is provided on the bottomed portion.

(Second Embodiment)
A second embodiment will be described with reference to FIGS.

  The illumination light source 2 of the second embodiment includes bases 210 and 220 at both ends of a hexagonal columnar tubular member 200. The perspective view of the illumination light source 2 is shown in FIG. 10, and the CC sectional view is shown in FIG. The materials used are the same as those in the first embodiment, and the parts different from the first embodiment are the shape of the tubular member 200, the base 230 according to the shape of the tubular member, the base 210 and 220.

  The inner and outer shapes of the tubular member 200 are both regular hexagons. The depressions 201a, 201b, 201c, 201d, 201e, and 201f on the inner periphery 201 of the cross-section tube wall serve as regular hexagonal corners. The length of the tubular member 200 is 1200 mm, and the length of the diagonal distance passing through the center of the regular hexagon is 28 mm.

  The base 230 includes an aluminum plate 231 and a wiring board 232 as in the first embodiment. The aluminum plate 231 has a thickness of 0.5 mm, and is formed by pressing so as to form a groove continuous in the z-axis direction that is the longitudinal direction of the illumination light source 2. The side surface of the aluminum plate 231 is in close contact with three continuous surfaces among the six inner wall surfaces of the tubular member 200 (see FIG. 11). Mounted on the groove bottom 233 of the aluminum plate 231 is a wiring board 232 on which a package 250 for housing the LED chip 251 is mounted linearly. The groove side surface portion 234 of the aluminum plate 231 is a mirror surface that reflects light emitted from the package. The lengths of the aluminum plate 231 and the wiring board 232 are both 1170 mm. Unlike the first embodiment, the wiring board 232 of the present embodiment is a continuous one, but the total number of mounted LEDs and the electrical connection are the same as those shown in FIG. Yes.

  The opening end of the aluminum plate that becomes the side edge portions 231a and 231b of the aluminum plate 231 is sandwiched between two depressions 201a and 201d located diagonally through the center of the regular hexagon surrounded by the inner peripheral wall of the tubular member. Thus, the aluminum plate 231 is supported by the tubular member 200 in a state in which the position is regulated. The aluminum plate 231 has an elastic deformation characteristic that the opening tends to open to the outside, and the opening end portion presses the above-described two recesses, and as a result, the base 230 is fixed. In the regular hexagonal shape of the inner periphery 201 of the tube wall cross section of the tubular member 200, the distance between two points on the side not in contact with the aluminum plate 231 is shorter than the diagonal distance of the regular hexagon. That is, it has a function of restricting the base 230 from moving upward (y-axis direction). Therefore, the aluminum plate is pressed against the inner wall of the tubular member and is in close contact with the inner wall. As a result, the heat generated in the LED chip 251 is transmitted to the tubular member 200 through the aluminum plate 231 that is the base 230 and is radiated.

  In the first embodiment, the bases 110 and 120 have openings, and the ends of the tubular members are attached so as to enter the openings. In this embodiment, the bases 210 and 220 are tubular members. It is attached so as to enter the opening at the end of 200. When attached in the form related to the base, the outer shape of the tubular member 200 and the outer shape of the illumination light source 2 can be matched, so that the end of the illumination light source 2 cannot be projected by the base. As a result, accumulation of dust can be prevented. Moreover, it becomes possible to demonstrate the feature in the design side.

(Modification)
A modification of the second embodiment will be described with reference to FIG.

  FIG. 12 is a cross-sectional view of an illumination light source 3 that is a modification of the illumination light source 2. The same part as the second embodiment is the shape of the inner periphery of the tubular member 300 in contact with the base 330 and the base, and the different part is the inner periphery 301 of the tubular part of the part not in contact with the base. And the shape of the outer periphery 302. The shape of the base depending on the shape of the tubular member also changes, but the description thereof is omitted.

  Of the inner periphery 301 of the tubular member 300, the portion in contact with the base 330 is composed of three sides of a virtual regular hexagon 303 indicated by a broken line. It is the same as the second embodiment in that open end portions 331a and 331b which are side edges of the aluminum plate 331 are sandwiched between recesses 301a and 301d located diagonally passing through the center of the virtual regular hexagon. is there. The portion of the tubular member 300 where the aluminum plate 331 is not in contact has a dome shape. The aluminum plate 331 has a spring characteristic that the opening tends to open to the outside, and the opening end is pressed against the two recesses 301a and 301d. As a result, the aluminum plate 331, that is, the base 330 is fixed. Since the distance between the two points on the circumference not contacting the aluminum plate 331 on the inner peripheral wall is shorter than the diagonal distance of the regular hexagon, the aluminum plate 331 moves upward (y-axis direction). It has a function to limit. Therefore, the aluminum plate is pressed against the inner wall of the tubular member and is in close contact with the inner wall. As a result, the heat generated in the LED chip 351 is transferred to the tubular member 300 via the aluminum plate 331 that is a base, and is radiated. Such a configuration and effect are the same as those of the second embodiment.

  The difference from the second embodiment is that in this modification, the dome-shaped portion 304 has a lens function, and forms various light distribution patterns by combining the reflection function of the base aluminum plate. It is a point which has the function to do.

(Third embodiment)
The overall configuration of the illumination light source according to the third embodiment of the present invention will be described with reference to FIGS. The illumination light source 4 according to the third embodiment of the present invention shown in FIG. 13 includes bases 410 and 420 at both ends of a cylindrical tubular member 400 serving as an outer member. The tubular member is made of a translucent material such as polycarbonate, and a plurality of LED chips, which are semiconductor light-emitting elements, are accommodated in a linear form on a long base. As shown in the DD cross-sectional view of the illumination light source 4 (FIG. 14), the outer periphery 402 of the tubular member has a circular shape, and the inner periphery 401 has a corner formed by chamfering depressions 401a, 401b, 401c, and 401d. It is. In this embodiment, it is assumed that it is used in place of an existing straight tube fluorescent lamp. For example, 1195 mm, the outer diameter of the tubular member is 29 mm, and the diagonal distance of the inner peripheral wall is 27 mm.

  The base 430 includes a square columnar aluminum bar 431 and a chip mounting substrate 432 on which LED chips are mounted on each side of the square column. The corners of the rectangular columnar aluminum bar 431 are provided with fin structures 433 that also serve as reflectors, and the tips of the fins are in contact with the corners of the inner periphery 401 of the tubular member, so that the aluminum bar 431 is in the tubular member 400. It is fixed inside. That is, the chamfered corner portions 401a, 401b, 401c, and 401d are recessed, and the side edges 431a, 431b, 431c, and 431d in the longitudinal direction of the base are sandwiched to regulate the position of the aluminum rod 431. As in the first and second embodiments, the distance between the diagonals of the quadrangle is the longest distance between the inner peripheral walls, and the position of the base having the same width as the longest distance is restricted.

  The chip mounting substrate 432 is a long ceramic substrate having a thickness of 1 mm, a width of 10 mm, and a length of 1960 mm, and 48 LED chips are mounted linearly. FIG. 15 shows a chip mounting substrate 432 viewed from the surface on which the LED chip is mounted. The peripheral portion of the chip mounting substrate is fixed to the aluminum rod with a screw (not shown) through a pressing member (not shown). The LED chip 441 is formed by laminating a plurality of nitride semiconductor layers having different compositions on a sapphire substrate, and has a 400 μm square shape in a top view. The LED chip 441 is mounted on the chip mounting substrate 432 via a bonding material with the sapphire substrate side facing down. Wire bond portions of the cathode electrode and the anode electrode are respectively formed at the end of the surface opposite to the sapphire substrate. The LED chips are electrically connected in 24 series and 2 in parallel by wiring patterns 442a and 442b and wire bonding 445 on the chip mounting substrate. Such a chip mounting substrate is arranged on each side surface of a square columnar aluminum rod, and power supply terminals 446 and 447 provided at both ends of the chip mounting substrate are electrically connected to form a 24 × 8 parallel LED chip array. . On each chip mounting substrate, a resin 443 containing a phosphor is applied in a linear shape so as to cover the LED chip in a portion indicated by a broken line in FIG.

  The illumination light source 4 corresponds to the Japan Light Bulb Industry Association standard JEL801 “Straight-tube LED lamp system with L-shaped base”, and has a base at both ends of a tubular member, one of which has an L-shaped pin 411a. Two power supply caps 410 are provided, and the other is a grounding cap 420 having one T-shaped pin 421.

  Both ends of the LED chip row are electrically connected to the pins of the power supply cap, and the pins of the ground cap are electrically connected to the aluminum rod.

(Fourth embodiment)
The overall configuration of the illumination light source according to the fourth embodiment of the present invention will be described with reference to FIGS. 16 and 17. The illumination light source 5 according to the fourth embodiment of the present invention shown in FIG. 16 includes a base 510 at one end of an elliptical columnar tubular member 500 serving as an outer member. The tubular member has a length of 480 mm, and is made of a translucent material such as glass having an opening on the base side and closed on the other side. Inside, a plurality of LEDs, which are semiconductor light-emitting elements, are accommodated in a straight line on both sides of a long base. An EE cross-sectional view of the illumination light source 5 of FIG. 16 is shown in FIG. Both the inner periphery 501 and the outer periphery 502 of the tube wall cross section of the tubular member 500 are elliptical. The major axis length of the ellipse is 29 mm on the inner circumference and 30 mm on the outer circumference, and the minor axis length is 24 mm on the inner circumference and 25 mm on the outer circumference. Arc portions 501a and 501b intersecting with the major axis of the ellipse become depressions that are fixed with the base 530 interposed therebetween. The length of the major axis of the ellipse is the longest distance between the inner peripheral walls of the tubular member, and the position of the base having the same width as the longest distance is restricted.

  The base 530 is a chip mounting substrate 531 in which the LED chip 541 is mounted on one surface of the ceramic substrate, and is integrated by pasting the other side after mounting the LED chip. The chip mounting substrate is a long ceramic substrate having a thickness of 1 mm, a width of 29 mm, and a length of 450 mm. Similar to the third embodiment, a plurality of LED chips are mounted in a straight line, and a resin containing a phosphor is used. It is applied linearly so as to cover the LED chip.

  A circuit component (not shown) such as a rectifier circuit is accommodated in the base and is electrically connected to the circuit component and the LED chip.

  In the above embodiment, an example in which a blue LED chip and a yellow phosphor are combined to emit white light has been described. However, the LED chip and the phosphor are not limited to the above-described embodiment, and may be used depending on the application. Needless to say, the emission color of the LED chip, the presence or absence of the phosphor, and the type can be selected as appropriate. A single-color light such as blue, green, or red is combined with the LED chip alone, or a combination thereof, or a blue-violet to near-ultraviolet LED chip and a single phosphor such as blue, green, red, or the combination thereof is used. It is also possible.

  Moreover, although the cross-sectional inner wall of the tubular member has shown the example of the regular polygon of a regular tetragon and a regular hexagon, the polygon from which the length of a side differs may be sufficient. Further, it may be a polygon including an inner angle exceeding 180 ° like a star shape. It is also possible to give a round corner to the recess.

  The present invention provides means for regulating and supporting the position of a long base on which an LED is mounted without providing a protruding structure on the inner wall surface of a long tubular member that is an outer member of an illumination light source. Therefore, it has high applicability, such as improving the productivity of the outer member, diversity of material selection, and simplifying the assembly of the illumination light source.

1, 2, 3, 4, 5 Illumination light source 100, 200, 300, 400, 500 Tubular member 101, 201, 301, 401, 501 Inner circumference 101a-d, 201a-f, 301a-d, 401a-d, 501a , B Depression 102, 202, 302, 402, 502 Outer periphery 110, 120, 210, 220, 410, 420, 510 Base 130, 230, 330, 430, 530 Base 131, 231, 331 Aluminum plate 131a, 131b, 231a 231b, 331a, 331b, 431a-d Side edge 132, 232 Wiring board 140a, 140b, 141a, 141b, 142a, 142b, 143 Cable 150, 250 Package 151, 251, 351, 441, 541 LED chip 153, 443 Resin containing phosphor 160 Lighting equipment 431 Aluminum rod

Claims (5)

A plurality of light emitting elements;
A base on which the light emitting element is mounted;
A tubular member made of a translucent material that houses the base;
A base for receiving electric power for causing the light emitting element to emit light from at least one end of the tubular member;
With
In the inner periphery of the tube wall cross section of the tubular member formed by cutting in a direction perpendicular to the central axis direction of the tubular member, there are recesses facing each other,
The recess is formed continuously and linearly from one end to the other end of the tubular member,
An illumination light source characterized in that the position is regulated by sandwiching the base between the recesses. 2. The illumination light source according to claim 1, wherein an inner periphery of the cross section of the tube wall is a polygon, and corner portions of the polygon become the depressions and are located diagonally to the polygon. The illumination light source according to claim 1, wherein the distance between the recesses is the longest distance between the two points connecting the inner peripheries of the tube wall cross section. 2. The illumination light source according to claim 1, wherein an inner circumference of the tube wall cross section is an ellipse, and an arc intersecting with the major axis of the ellipse is the depression. The illumination light source according to claim 1, wherein a side surface of the base is in contact with an inner wall of the tubular member.

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