JP5721644B2 - Lighting lamp - Google Patents

Description

  The present invention relates to an illumination lamp such as an LED (light emitting diode) lamp.

In a straight tube type LED lamp, a heat sink is used for heat dissipation, but the heat sink mounting structure is complicated.
For example, the heat sink has a two-layer structure of an upper side and a lower side. If the heat sink is longer than the glass tube, it interferes with the glazing portion (the protruding portion) formed on the inner surface of the end portion of the glass tube.
In order not to interfere with the glazing portion (the protruding portion), the heat sink needs to have a two-layer structure. The upper heat sink is longer than the glass tube and the lower heat sink is shorter than the glass tube.
Further, the upper heat sink and the base are fastened with screws or the like. Alternatively, the upper heat sink and the base are fastened with a hole in the heat sink and a pin (resin boss) of the base.
As described above, when the heat sink is structurally combined with two parts, it is difficult to assemble the LED lamp, and the design and structure become complicated.

  In addition, a straight tube type LED lamp has restrictions on length and dimensions. For example, the total length is 1212.6 mm, the diameter of the base is 28.8 mm, and the diameter of the glass tube is 25.5 mm. When the length of the lamp is restricted by fastening the screw of the component, the length of the lamp is determined by the screw through hole and the screw diameter play (play) + external tolerance. Further, when the length of the lamp is regulated by the hole and pin (resin boss) of the component, the length of the lamp is determined by the backlash (play) of the hole and pin diameter (resin boss diameter) + outer tolerance.

JP 2012-009451 A JP 2012-009379 A

  In the embodiment of the present invention, for example, an object is to ensure attachment of a heat sink of a straight tube type LED lamp with a simple structure. It is another object of the present invention to provide an illumination lamp having high heat sink adhesion and heat dissipation.

The illumination lamp according to the present invention is:
A tube,
A heat sink extending over the longitudinal direction of the tube ;
A base attached to the end of the tube and fixing the heat sink ;
The tube has a protruding portion that bulges in the inner direction of the tube on the inner surface of the end,
The length L2 of the heat sink is shorter than the length L1 of the tube, and extends to the central portion other than the end where the protruding portion exists,
The heat sink has an arcuate portion disposed along the inner peripheral surface of the cylindrical tube, rather greater than the height H3 of the arcuate portion thickness H2 is ledge,
The heat sink has a D-shaped cross section perpendicular to the longitudinal direction, and has a hollow portion inside.
The base is
The inner wall of the base,
An abutting portion that projects from the inner wall of the base in the longitudinal center direction of the cylindrical tube and abuts at least a part of the end of the heat sink;
A fitting part that protrudes further from the abutting part in the longitudinal center direction of the tube and is inserted into the hollow part of the heat sink;
Have
The abutting outer peripheral portion closest to the cylindrical tube of the abutting portion is separated from the inner surface of the cylindrical tube by a predetermined distance H1 so as not to contact the protruding portion,
The fitting outer peripheral portion that is closest to the tube of the fitting portion is characterized by being separated from the inner surface of the tube by the predetermined distance H1 or more .

  The illumination lamp according to the present invention can ensure the attachment of the heat sink and maintain and improve the adhesion and heat dissipation of the heat sink.

FIG. 3 shows an illumination lamp 50 according to the first embodiment. FIG. 3 shows a heat sink 54 of the illumination lamp 50 according to the first embodiment. The figure which shows the AA end surface of the illumination lamp 50 of Embodiment 1. FIG. The figure which shows the ZZ cross section of the illumination lamp 50 of Embodiment 1. FIG. The figure which shows the nozzle | cap | die 55 of the illumination lamp 50 of Embodiment 1. FIG. The figure which shows the ZZ cross section of the illumination lamp 50 of Embodiment 2. FIG. The figure which shows the glass tube 56 and the diffusion film 90 of the illumination lamp 50 of Embodiment 3. FIG. FIG. 9 shows symbols of Embodiment 3. FIG. 6 is a schematic diagram showing the length of each part of a T8 type illumination lamp 50 of Example 1 of Embodiment 3. The figure which shows the circular arc length ratio of the adhesive agent 92 of T8 type illumination lamp 50 of Example 3 of Embodiment 3, adhesiveness, and LED chip temperature. The figure which shows arc length ratio of the adhesive agent 92 and LED chip temperature of the T8 type illumination lamp 50 of Example 1 of Embodiment 3. FIG. The figure which shows the length of each part of the adhesive agent 92 of the T8 type illumination lamp 50 of Example 2 of Embodiment 3. FIG. The figure which shows the arc length ratio of the adhesive agent 92 of T8 type illumination lamp 50 of Example 3 of Embodiment 3, adhesiveness, and LED chip temperature. The figure which shows the circular arc length ratio of the adhesive agent 92 and LED chip temperature of the T8 type illumination lamp 50 of Example 2 of Embodiment 3. FIG. The figure which shows the length of each part of the adhesive agent 92 of the T10 type illumination lamp 50 of Example 3 of Embodiment 3. FIG. The figure which shows the circular arc length ratio of the adhesive agent 92, adhesiveness, and LED chip temperature of the T10 type illumination lamp 50 of Example 3 of Embodiment 3. FIG. The figure which shows arc length ratio of the adhesive agent 92 and LED chip temperature of the T10 type illumination lamp 50 of Example 3 of Embodiment 3. FIG. The figure which shows the arc length ratio, adhesiveness, and LED chip temperature of the double-sided adhesive tape 93 of the T8 type illumination lamp 50 of Example 4 of Embodiment 3. FIG. The figure which shows the circular arc length ratio and LED chip temperature of the double-sided adhesive tape 93 of the T8 type illumination lamp 50 of Example 4 of Embodiment 3. FIG. The figure which shows the circular arc length ratio, adhesiveness, and LED chip temperature of the double-sided adhesive tape 93 of the T8 type illumination lamp 50 of Example 5 of Embodiment 3. FIG. The figure which shows the circular arc length ratio of the double-sided adhesive tape 93 of the T8 type illumination lamp 50 of Example 5 of Embodiment 3, and LED chip temperature.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an illumination lamp 50 according to the first embodiment.
The illumination lamp 50 has a cylindrical glass tube 56. The glass tube 56 is a transparent straight tube type glass tube and is an example of a tube tube. The tube may not be a glass tube but may be a transparent or translucent resin tube.
The central axis O is a center line connecting the centers of the cylindrical glass tubes 56.

The light emitting unit 60 includes a light emitting diode LED 51 (LED 51), a substrate 52, and a heat sink 54.
The light emitting unit 60 is housed in the glass tube 56 and emits light in the light emitting direction. The light emitting unit 60 extends in the longitudinal direction of the glass tube 56.

The LED 51 is composed of a single LED (light emitting diode) or an LED module. The LED 51 is also referred to as an LED chip.
The substrate 52 has a plurality of LEDs 51 arranged and arranged uniformly.

  The heat sink 54 is made of metal such as aluminum and serves as a pedestal to which the substrate 52 is attached and a heat radiating member.

There are a pair of caps 55 at both ends of the glass tube 56.
Each base 55 includes a pair of power supply terminals 58. The number and shape of the power supply terminals 58 are not limited to the drawing and may be other numbers or shapes.

  The pair of caps 55 covers both ends of the glass tube 56 and is fixed to both ends of the heat sink 54 of the light emitting unit 60 and both ends of the glass tube 56.

A diffusion film 90 is provided on the inner surface of the glass tube 56, and the diffusion film 90 diffuses light from the LED 51. The appearance of the glass tube 56 becomes cloudy or translucent due to the diffusion film 90.
Since the thickness of the diffusion film 90 is 10 to 50 μm at most, the following description will be made assuming that the thickness of the diffusion film 90 is zero.

  The illumination lamp 50 has a structure that prevents dust from entering the lamp that impairs safety during use from the viewpoint of long-term use. That is, the glass tube 56 and the base 55 are bonded together, and the light emitting unit 60 is sealed.

  The illumination lamp 50 has a glass outer shape, and the outer shape is the same as that of a conventional straight tube fluorescent lamp. The illumination lamp 50 is a straight tube LED lamp system that cannot be permanently disassembled without impairing its function.

FIG. 2 is a perspective view of the heat sink 54.
The cross-sectional shape of the heat sink 54 by a plane orthogonal to the longitudinal direction is a D-shape or a half-moon shape.
The heat sink 54 is an integrally formed aluminum part, and has a flat plate portion 62 and an arc-shaped portion 63.
The flat plate portion 62 has a flat plate shape, and the arc-shaped portion 63 has an arcuate curved surface obtained by cutting a circular column with a flat plate.
There is a hollow portion 64 between the flat plate portion 62 and the arc-shaped portion 63. The shape of the hollow portion 64 is also D-shaped or half-moon shaped.
The arc portion of the hollow portion 64 is the inner peripheral surface of the arc-shaped portion 63, and the chord portion of the hollow portion 64 is formed on the back surface of the flat plate portion 62.
There are holes 61 penetrating the flat plate portion 62 at both ends of the flat plate portion 62. The shape of the hole 61 is arbitrary, such as a circle, an ellipse, and a square.

  The length of the heat sink 54 in the longitudinal direction is L2. The radius from the central axis O of the glass tube 56 to the outer peripheral surface of the arc-shaped portion 63 is R2, the radius to the inner peripheral surface of the arc-shaped portion 63 is R3, and the arc length of the outer periphery of the arc-shaped portion 63 is K1.

FIG. 3 is a diagram illustrating an AA end surface (an end surface formed by a plane orthogonal to the longitudinal direction) of the illumination lamp 50 according to the first embodiment.
The diffusion film 90 is a film formed on the inner surface of the glass tube 56. The diffusion film 90 diffuses light and transmits light. The diffusion film 90 does not exist all around, but does not exist partially. That is, there is no diffusion film 90 in the opening 91.
The opening 91 is arranged linearly in the longitudinal direction of the glass tube 56 with a predetermined width (predetermined arc length K2).
The adhesive member 59 is applied to the opening 91 of the diffusion film 90 and adheres the inner surface of the glass tube 56 and the outer peripheral surface of the arc-shaped portion 63 of the heat sink 54.

In FIG. 3, the length of each part has the following relationship.
Arc length K3 of adhesive member 59 ≦ arc length K2 of opening 91 of diffusion film 90 ≦ arc length K1 of heat sink 54
The inner peripheral surface radius R3 of the arc-shaped portion 63 <the outer peripheral surface radius R2 of the arc-shaped portion 63 <the inner peripheral surface radius R1 of the glass tube 56.

  Although “the outer peripheral surface radius R2 of the arc-shaped portion 63 <the inner peripheral surface radius R1 of the glass tube 56”, in order to improve heat dissipation, the outer peripheral surface radius R2 of the arc-shaped portion 63 is the inner peripheral surface radius R1 of the glass tube 56. It is a little smaller. Further, since there is an adhesive member 59 between the heat sink 54 and the glass tube 56, no part of the heat sink 54 is in direct contact with the inner periphery of the glass tube 56 and the diffusion film 90. The reason is to prevent the metal heat sink 54 from damaging the glass tube 56 and the diffusion film 90. That is, the heat sink 54 is fixed by the adhesive member 59 in a state of being separated (floating) from the glass tube 56 and the diffusion film 90.

FIG. 4 is a diagram illustrating a ZZ vertical section of the illumination lamp 50 according to the first embodiment.
FIG. 5 is a view of the base 55 as viewed from the inner direction (the direction of the arrow X in FIG. 4).
In FIG. 5, the heat sink 54 and the glass tube 56 are indicated by dotted lines.
In the longitudinal direction, the length L 1 of the glass tube 56 is longer than the length L 2 of the heat sink 54.
The base 55 is a resin molded product and includes an upper base 71 and a lower base 72. The upper base 71 is fixed to the lower base 72 with screws (not shown).
The upper base 71 and the lower base 72 have a semicylindrical shape as a whole. Each of the upper base 71 and the lower base 72 has a semi-cylindrical and thin cover portion 70. The cover portion 70 covers half of the outer periphery of the end portion of the glass tube 56, and the inner surface of the cover portion 70 and the outer periphery of the end portion of the glass tube 56 are bonded with an adhesive 57.

In FIG. 5, the lower base 72 has an inner wall 74 erected inside the lower base 72.
The shape of the inner wall 74 is circular, but the shape may be a tongue shape, a bowl shape, a plate shape, or other shapes.

  There is an abutting portion 75 projecting from the inner wall 74 in the longitudinal center direction. The overall shape of the abutting portion 75 is a substantially semi-cylindrical shape. The radius from the central axis O of the glass tube 56 to the outer peripheral surface of the abutting portion 75 (abutting outer peripheral portion 82) is R3.

An abutting surface 76 orthogonal to the central axis O is provided at the center-side front end surface of the abutting portion 75. The abutting surface 76 is a surface that abuts at least a part of the end surface 85 of the end surface 85 at the end of the heat sink 54.
4 and 5, the end surface 85 is only on the upper side of the abutting portion 75, and the abutting surface 76 abuts only the end surface 85 of the flat plate portion 62 of the heat sink 54.

  With the heat sink 54 inserted and bonded to the center of the glass tube 56, the lower base 72 is inserted from both sides of the glass tube 56. The abutting surface 76 is abutted against the end surfaces 85 at both ends of the heat sink 54, and the base 55 is positioned in the longitudinal direction of the glass tube 56 by the abutting portion 75 (abutting surface 76).

Therefore, the total length in the longitudinal direction of the illumination lamp 50 excluding the power supply terminal 58 is as follows when the length from the base end surface 73 to the abutment surface 76 (base reference length) is L3.
The length L of the illumination lamp 50 = the length L2 + of the heat sink 54+ (base length L3 × 2)

  Here, the length L of the illumination lamp 50 is not related to the length L1 of the glass tube 56. The length L of the illumination lamp 50 is determined only by the length L2 of the heat sink 54 and the length L3 (base reference length L3) from the base end surface 73 to the butting surface 76. Further, no pin, hole or boss is used for fastening the heat sink 54 and the base 55, and no screw hole or screw is used.

  A straight tube type LED lamp has a length restriction. For example, the total length is 1212.6 mm. When the length L of the illumination lamp 50 is determined only by the length L2 of the heat sink 54 and the base reference length L3, only the contact between the end surface 85 of the heat sink 54 and the abutting surface 76 (the contact between the flat surface and the flat surface). Therefore, the length L of the illumination lamp 50 is determined, so that there is no backlash (play) as compared to the case where the length is restricted by screw fastening or the case where the length is restricted by a hole and a pin (resin boss). That is, the length L of the illumination lamp 50 can be determined only by the outer shape tolerance of the length L2 of the heat sink 54 and the base reference length L3.

  The overall shape of the abutting portion 75 does not have to be a substantially semi-cylindrical shape, and may be any shape as long as the abutting surface 76 can be firmly formed.

  There is a fitting portion 77 protruding from the portion excluding the abutting surface 76 on the longitudinal center side of the abutting portion 75 by a length L6 in the longitudinal center direction. The cross-sectional shape of the fitting portion 77 is a D-shape or a half-moon shape. At the center of the cross section of the fitting portion 77 is a hollow resin hollow portion 79, which reduces the amount of resin used. The resin hollow portion 79 may be penetrated from the fitting portion 77 to the butting portion 75 and further to the inner wall 74, and the amount of resin used can be further reduced. The radius from the central axis O of the glass tube 56 to the outer peripheral surface of the fitting portion 77 (fitting outer peripheral portion 83) is R3, which is the same as the inner peripheral radius of the arc-shaped portion 63 of the heat sink 54.

The cross-sectional outer shape of the fitting portion 77 has the same shape as the cross-sectional contour shape of the hollow portion 64 of the heat sink 54, and the fitting portion 77 is inserted into the hollow portion 64 by a length L6 without a gap. Thus, the lower base 72 of the base 55 is positioned in the vertical and horizontal directions with respect to the two-dimensional cross-sectional space (plane space perpendicular to the longitudinal direction) of the glass tube 56 by the fitting portion 77 of the base 55.
The hollow portion 64 of the heat sink 54 penetrates in the longitudinal direction of the heat sink 54 with the same cross-sectional shape. However, in relation to the fitting portion 77, the fitting portion 77 is inserted into the hollow portion 64. It only needs to exist in the longitudinal center direction from the end face 85 of the heat sink 54 to a depth (length L6) or more.

  As described above, since the three-dimensional position of the lower base 72 of the base 55 with respect to the glass tube 56 is determined by the abutting portion 75 and the fitting portion 77, the abutting portion 75 and the fitting portion 77 are combined. This is referred to as a fixed portion 80.

  The fitting portion 77 is provided with a fitting claw 78. The fitting claw 78 has the elastic force of the resin itself. For this reason, the fitting claw 78 can move up and down. Since the fitting claw 78 has a slope on the center side and a vertical surface on the end side, the fitting claw 78 is easy to move in the center direction but is difficult to reverse. The position of the fitting claw 78 is arranged so as to come to the center of the hole 61 when the fitting portion 77 and the end face 85 of the hollow portion 64 are brought into contact with each other. If the fitting claw 78 fits into the hole 61, the vertical surface is caught on the side surface of the hole 61, so the lower base 72 cannot be reversed and cannot be removed from the heat sink 54.

  The area of the hole 61 is opened larger than the size of the fitting claw 78, and there is a gap around the fitting claw 78 to the side surface of the hole 61. Due to this gap, the fitting claw 78 has a tolerance (play) that can move in the longitudinal direction in the hole 61.

  The upper base 71 is screwed to the lower base 72, and the upper base 71 and the lower base 72 are bonded to the glass tube 56 with an adhesive 57, but the upper base 71 and the lower base 72 are deteriorated due to the deterioration of the adhesive 57. In order to eliminate the risk that 72 will come off from the glass tube 56, a fitting claw 78 is hooked on the hole 61 to prevent the upper base 71 and the lower base 72 from coming off from the glass tube 56.

  The fitting claw 78 has a margin (play) between the hole 61 and does not position the heat sink 54. The fitting claw 78 is an auxiliary mechanism for preventing the cap 55 from falling off.

Adhesion of the upper base 71 and the lower base 72 to the glass tube by the adhesive 57 does not fix the positional relationship between the base 55 and the glass tube 56.
The base 55 is not completely fixed to the glass tube 56 but is movably attached to the glass tube 56 with an adhesive 57 within a range in which the heat sink 54 expands and contracts.
For example, an elastic adhesive such as silicone rubber is used as the adhesive 57.

The linear expansion coefficient of the glass tube 56 is smaller than the linear expansion coefficient of the heat sink 54. It is assumed that the difference in length of the heat sink 54 between the temperature Tc (K) of the heat sink 54 when the lowest temperature is left unlit and the temperature Th (K) of the heat sink 54 when the highest temperature atmosphere is turned on is Smm. When manufacturing the illumination lamp 50 in an atmosphere of (Tc + Th) / 2 (K) ± 5 ° C., if the expansion and contraction of the glass tube 56 is ignored, the gap L4 between the tube end surface 86 of the glass tube 56 and the inner wall 74 of the base 55 is it may be under S ÷ 2 than in the S ÷ 4 or more.
S ÷ 4 ≦ gap L4 ≦ S ÷ 2

  Considering possible cooling shrinkage and high-temperature thermal expansion of the illumination lamp 50, it is desirable that the lamp is assembled at a room temperature of about (Tc + Th) / 2 (K). That is, when −20 ° C. (253K) is the lowest temperature state that can occur in the market and the length of the heat sink 54 when the actual machine is mounted is high, the heat sink 54 determines the positional relationship between the caps at both ends. (253 + 343) / 2 = 298 (K), that is, when assembled in an atmosphere of 25 ° C., the maximum value of shrinkage / expansion at the time of product completion can be minimized.

  Adhesion by the adhesive 57 is an adhesion that allows the distance between the base 55 and the glass tube 56 to approach or separate from each other due to the difference in linear expansion coefficient (thermal expansion difference) between the heat sink 54 and the glass tube 56 (loose). Adhesion). In order to absorb the change in length due to this thermal expansion, a gap L4 is provided between the cylinder end face 86 and the inner wall 74.

  The glass tube 56 has a protruding portion 81 that swells in the inner direction of the glass tube 56 on the inner surface of the end portion.

The protruding portion 81 is formed by heat treatment (glazing). When the cut end surface of the glass tube 56 is heated and softened by a burner to adjust the cross-sectional shape of the cut end of the glass tube 56 to a substantially circular shape, a protruding portion 81 is generated.
For example, the size of the protruding portion 81 is as follows.
Height H3 of the protruding portion 81 = 0.35 to 0.6 mm
Length L5 of the protruding portion 81 = 1.0 to 2.0 mm

The length L2 of the heat sink 54 is shorter than the length L1 of the glass tube 56, and the heat sink 54 is attached to a central portion other than the end where the protruding portion 81 exists. If the length of the protruding portion 81 in the longitudinal direction is L5, the following relationship is established.
The length L1 of the glass tube 56> the length L2 + of the heat sink 54 (the length L5 × 2 of the protruding portion 81)

Further, the thickness H 2 of the arc-shaped portion 63 of the heat sink 54 is larger than the height H 3 of the protruding portion 81.
The butting outer peripheral portion 82 closest to the glass tube 56 of the protruding portion 81 is separated from the inner surface of the glass tube 56 by a predetermined distance H1 so as not to contact the protruding portion 81.
The fitting outer peripheral portion 83 closest to the glass tube 56 of the fitting portion 77 is also separated from the inner surface of the glass tube 56 by the predetermined distance H1.
The abutting outer peripheral portion 82 and the fitting outer peripheral portion 83 are part of the outer peripheral surface of a cylinder having a radius R3 with the central axis O as the center.

Therefore, the fixing portion 80 including the abutting portion 75 and the fitting portion 77 is separated from the inner surface of the glass tube 56 by the predetermined distance H1 or more in any portion of the fixing portion 80.
Here, since the predetermined distance H1 is the sum of the thickness H2 of the arc-shaped portion 63 and the thickness H4 of the adhesive member 59, there is the following relationship.
Predetermined distance H1 = thickness H2 + of arc-shaped portion 63 + thickness H4 of adhesive member 59> height H3 of protruding portion 81
Here, assuming that the thickness H4 of the adhesive member 59 is zero, there is the following relationship.
Predetermined distance H1 = thickness H2 of arc-shaped portion 63> height H3 of protruding portion 81

  That is, if the thickness H 2 of the arc-shaped portion 63 is made larger than the height H 3 of the protruding portion 81, the outer peripheral portion 84 closest to the glass tube 56 of the fixed portion 80 can be prevented from contacting the protruding portion 81.

In order to avoid the glazing protrusion 81, the heat sink 54 is shorter than the glass tube 56, and the thickness of the arc-shaped portion 63 is set so as to avoid the glazing protrusion.
As a result, it is possible to avoid cracking of the glass tube caused by the heat sink 54 riding on the protruding portion 81 caused by glazing. In addition, it is possible to reduce the number of parts and suppress the cost increase without using two layers of heat sinks to avoid getting on.

As described above, in this embodiment, in the straight tube fluorescent lamp type LED lamp in which the LEDs are arranged in the glass tube 56 and the bases are arranged at both ends of the glass, the length of the heat sink 54 inside the glass tube 56 is set to the glass. Shorter than the tube 56 (inside the glazing portions at both ends of the glass tube 56), and the thickness of the arc-shaped portion 63 of the heat sink 54 (or the thickness of the arc-shaped portion 63 of the heat sink 54 + adhesion of the heat sink 54 to the inner surface of the glass The thickness of the member 59 is made thicker than the glass glazing height.
Further, if the radius of the fixing portion 80 of the base 55 is made equal to or less than the radius of the inner peripheral surface of the arc-shaped portion 63 of the heat sink 54, the base 55 can also avoid the glazing protrusion.

  By doing so, the heat sink 54 does not contact the glazing portion, and when the fitting portion 77 of the base 55 is fitted to the hollow portion 64 of the heat sink 54, the abutting portion 75 does not interfere with the glazing portion.

  Further, in this embodiment, since the glass tube 56 and the base 55 are fixed (loosely fixed) only with an adhesive, the fitting claw 78 (resin boss) and the hole 61 of the heat sink 54 are used to prevent the base from dropping. , To prevent falling off (prevention of cap removal).

  In this embodiment, the length of the illumination lamp 50 is restricted only by the length L3 from the base end surface 73 to the abutting surface 76 and the length L2 of the heat sink 54. Have a good fit. In order to absorb thermal stress, the hole 61 and the fitting claw 78 are fitted with a margin.

  Further, the glass tube 56 and the base 55 are provided with a gap L4 between the tube end face 86 and the inner wall 74 in order to absorb thermal stress and prevent cracks, and further provide a distance H1 so that they do not directly hit each other. Yes.

Embodiment 2. FIG.
Differences from the first embodiment will be described.
FIG. 6 is a diagram illustrating a ZZ vertical section of the illumination lamp 50 according to the second embodiment.

In FIG. 6, the abutting surfaces 76 are on both upper and lower sides of the abutting portion 75. Therefore, all end surfaces 85 of the arc-shaped portion 63 and the flat plate portion 62 of the heat sink 54 abut against the abutting surface 76.
The abutting surface 76 may abut a part or all of the end face 85 of the inner wall 74, but if the abutting surface 76 is on both the upper and lower sides of the abutting portion 75 and further on both the left and right sides, The base end face 73 of the base 55 is easily maintained in a state orthogonal to the central axis O, and the base 55 does not tilt with respect to the central axis O.

In FIG. 6, the fitting outer peripheral portion 83 closest to the glass tube 56 of the fitting portion 77 is separated from the inner surface of the glass tube 56 by a distance H5 that is larger than the predetermined distance H1. The radius of the fitting outer peripheral portion 83 and the radius of the inner peripheral surface of the arc-shaped portion 63 of the heat sink 54 are R4 and are smaller than the radius R3 of the abutting outer peripheral portion 82.
Radius R4 of fitting outer peripheral portion 83 = radius R4 of inner peripheral surface of arc-shaped portion 63 <radius R3 of abutting outer peripheral portion 82

  Also in FIG. 6, the fixing portion 80 is separated from the inner surface of the glass tube 56 by the predetermined distance H1 or more in any portion of the fixing portion 80.

Here, the distance H5 is the sum of the thickness H2 of the arc-shaped portion 63 and the thickness H4 of the adhesive member 59, and has the following relationship.
Distance H5> predetermined distance H1 = thickness H2 + of arc-shaped portion 63 + thickness H4 of adhesive member 59> height H3 of protruding portion 81

Here, assuming that the thickness H4 of the adhesive member 59 is zero, there is the following relationship.
Distance H5> predetermined distance H1 = thickness H2 of the arc-shaped portion 63> height H3 of the protruding portion 81
Also in the case of FIG. 6, when the thickness H <b> 2 of the arc-shaped portion 63 is made larger than the height H <b> 3 of the protruding portion 81, the fitting outer peripheral portion 83 closest to the glass tube 56 of the fitting portion 77 becomes the protruding portion 81. You can avoid touching.

However, even if the thickness H2 of the arc-shaped portion 63 is greater than the height H3 of the protruding portion 81, the abutting outer peripheral portion 82 that is closest to the glass tube 56 of the abutting portion 75 does not contact the protruding portion 81. It is not always possible to do so.
In the case of FIG. 6, the predetermined distance H1 is not related to the thickness H2 of the arc-shaped portion 63.
Predetermined distance H1> height H3 of the protruding portion 81
The inner radius R1 of the glass tube 56> the radius R3 of the abutting outer periphery 82 + the height H3 of the protruding portion 81
The shape of the abutting portion 75 is designed and manufactured so that

  The cross-sectional shape of the hollow portion 64 of the heat sink 54 and the cross-sectional shape of the fitting portion 77 may not be a D-shape or a half-moon shape. What is the cross-sectional shape of the hollow portion 64 and the cross-sectional shape of the fitting portion 77? They may be the same, and may be a triangle, a rectangle, a trapezoid, other polygons, an ellipse, or the like.

Further, the cross-sectional shape of the hollow portion 64 of the heat sink 54 and the cross-sectional shape of the fitting portion 77 are not necessarily the same. The shape of the fitting part 77 should just have a part inserted in the corner | angular part (corner) of the hollow part 64. FIG.
For example, as shown in FIG. 5, when the cross-sectional shape of the hollow portion 64 of the heat sink 54 is D-shaped, the cross-sectional shape of the fitting portion 77 may be a triangle connecting three points E1, E2, and E3. . Alternatively, the cross-sectional shape of the fitting portion 77 may be a T-shape including a straight line connecting E1 and E2 and a straight line connecting the center of the straight line and E3.

  In short, the fitting portion 77 only needs to determine the vertical and horizontal positions of the lower base 72 in the two-dimensional sectional space of the glass tube 56 by being inserted into the hollow portion 64.

  When the fitting portion 77 moves vertically and horizontally in the two-dimensional cross-sectional space of the glass tube 56 within the hollow portion 64, the heat sink 54 is likely to move vertically and horizontally within the glass tube 56 when the lamp is subjected to external vibration. Therefore, there is a risk that the heat sink 54 contacts and collides with the glass tube 56 or the diffusion film 90 to destroy the glass tube 56 or the diffusion film 90. Therefore, it is desirable that the fitting portion 77 is inserted into the hollow portion 64 without a gap. The fitting portion 77 and the hollow portion 64 may be bonded.

As described above, in the first and second embodiments, the illumination lamp 50 as described below has been described.
The illumination lamp 50 includes a glass tube 56 (cylindrical tube) and a heat sink 54 extending in the longitudinal direction of the glass tube 56 (cylindrical tube).

  The glass tube 56 (cylindrical tube) has a protruding portion 81 swelled in the inner direction of the glass tube 56 (cylindrical tube) on the inner surface of the end, and the length L2 of the heat sink 54 is the length of the glass tube 56 (cylindrical tube). It is shorter than the length L1 and extends to the central portion other than the end where the protruding portion 81 exists.

  The heat sink 54 has an arcuate portion 63 disposed along the inner peripheral surface of the glass tube 56 (cylindrical tube), and the thickness H2 of the arcuate portion 63 is larger than the height H3 of the protruding portion 81.

The illumination lamp further includes a base 55 that is attached to an end of a glass tube 56 (cylinder tube) and fixes the heat sink 54.
The heat sink 54 has a D-shape in which a cross-sectional shape orthogonal to the longitudinal direction has a hollow portion inside.
The base 55 has a fixing portion 80 that protrudes in the longitudinal direction of the glass tube 56 (cylindrical tube) and fixes the heat sink. The fixing portion 80 includes an abutting portion 75 and a fitting portion 77.
The outer peripheral portion 84 closest to the glass tube 56 (cylindrical tube) of the fixing portion 80 is separated from the inner surface of the glass tube 56 (cylindrical tube) by a predetermined distance H1 or more so as not to contact the protruding portion 81.

Further, the base 55 will be described in detail.
The base 55 is
The inner wall 74 of the base,
An abutting portion 75 projecting from the inner wall 74 of the base in the longitudinal center direction of the glass tube 56 (cylindrical tube) and abutting at least a part of the end of the heat sink 54;
It further has a fitting portion 77 that protrudes from the butting portion 75 in the longitudinal center direction of the glass tube 56 (cylindrical tube) and is inserted into the hollow portion of the heat sink 54.

  The abutting outer peripheral portion 82 closest to the glass tube 56 (cylindrical tube) of the abutting portion 75 is separated from the inner surface of the glass tube 56 (cylindrical tube) by a predetermined distance H <b> 1 so as not to contact the protruding portion 81. ing.

  The fitting outer peripheral portion 83 closest to the glass tube 56 (cylindrical tube) of the fitting portion 77 is separated from the inner surface of the glass tube 56 (cylindrical tube) by the predetermined distance H1 or more.

The base 55 has an abutment surface 76 that is inserted into the glass tube 56 (cylinder tube) from the end of the glass tube 56 (cylinder tube) and abuts against the end surface 85 of the heat sink 54.
A predetermined length L (length L defined by the standard) of the illumination lamp 50 is defined and determined by the length L3 from the base end surface 73 to the abutting surface 76 and the length L2 of the heat sink 54.

The heat sink 54 has a D-shaped cross section perpendicular to the longitudinal direction and a hollow portion 64 inside, and has a hole 61 opened from the hollow portion 64 toward the outside.
The base 55 is
A fitting portion 77 to be inserted into the hollow portion 64 of the heat sink 54;
A fitting claw 78 protruding from the fitting portion 77 and fitted into the hole 61 is provided.

The glass tube 56 (cylinder tube) is fixed to the base 55 with an adhesive 57,
The tube end face 86 of the glass tube 56 (cylinder tube) and the inner wall 74 of the base 55 are arranged apart from each other by a predetermined distance L4 in the longitudinal direction of the glass tube 56 (cylinder tube).
The fitting claw 78 and the hole 61 have a predetermined tolerance in the longitudinal direction of the glass tube 56 (cylindrical tube).

Embodiment 3 FIG.
Differences from the first and second embodiments will be described.

  First, a method for manufacturing the illumination lamp 50 will be described.

Step 1.
An insulating film is attached to the front side of the heat sink 54. The insulating film may be silicone. Alternatively, a double-sided tape or other adhesive may be used. These may be used in combination.

Step 2.
The two substrates 52 on which the LEDs 51 are mounted are affixed to the insulating film. The two substrates 52 are electrically connected by a flexible substrate. Thus, the light emitting unit 60 is completed.

Step 3.
An adhesive 92 (for example, silicone adhesive) is applied to the back side of the heat sink 54 in a straight line in the longitudinal direction from a nozzle having a predetermined diameter.

Step 4.
The light emitting unit 60 is inserted into the glass tube 56 in which the diffusion film 90 and the opening 91 are formed. In that case, it inserts so that the back side of the heat sink 54 with which the adhesive agent 92 was apply | coated may be adhere | attached on the center of the opening part 91. FIG.

Step 5.
The light emitting unit 60 (heat sink 54) is positioned at the center of the glass tube 56 in the longitudinal direction.

Step 6.
Both ends of the light emitting unit 60 (heat sink 54) are pressed against the inner surface of the glass tube 56 to adhere the light emitting unit 60 to the glass tube 56.
Both ends of the light emitting unit 60 are pushed, and the adhesive 92 at both ends is spread wider than the adhesive 92 at the center.
FIG. 7 is a diagram showing a state after the bonding.
After the bonding, the arc length of the adhesive 92 at both ends is the maximum arc length K4 in the longitudinal direction.
Although both ends of the light emitting unit 60 are pushed and the center of the light emitting unit 60 tends to float, the silicone adhesive is used even if the center of the light emitting unit 60 is floating from the inner surface of the glass tube 56 because it is a silicone adhesive. Is bonded to the inner surface of the glass tube 56.

Step 7.
An adhesive 57 is applied to the inner periphery of the cover portion 70 of the lower base 72. The lower base 72 is mounted from both ends of the glass tube 56 while inserting the tube end face 86 of the glass tube 56 into the inner periphery of the cover portion 70. At that time, the abutting surface 76 is inserted into the hollow portion 64 of the heat sink 54 until the abutting surface 76 abuts against the end surface 85 of the heat sink 54. In the middle of the insertion, the fitting claw 78 enters the hole 61 and functions to prevent the 72 from coming off.

Step 8.
The power supply terminal 58 is fitted into the lower base 72.
An adhesive 57 is applied to the inner periphery of the cover part 70 of the upper base 71. The upper base 71 is fitted into the lower base 72 while being inserted into the inner periphery of the cover portion 70 from both ends of the glass tube 56 while the cylindrical end face 86 of the glass tube 56 is inserted into the inner periphery of the cover portion 70. Next, the upper base 71 is screwed to the lower base 72.

Step 9.
After drying for a while, the illumination lamp 50 is completed.

In FIG. 7, the diffusion film 90 is a film formed on the inner surface of the glass tube 56. The diffusion film 90 is not all around. The diffusion film 90 is not present in the opening 91. The adhesive member 59 is provided in the opening 91 of the diffusion film 90 and bonds the inner surface of the glass tube 56 and the outer peripheral surface of the arc-shaped portion 63 of the heat sink 54.
As shown in FIG. 7, when the illumination lamp 50 is completed, the arc length of each part has the following relationship.
Arc length K3 of the portion excluding both ends of the adhesive 92 ≦ arc length K2 of the opening 91 of the diffusion film 90 ≦ arc length K1 of the heat sink 54
Arc length K3 of the portion excluding both ends of the adhesive 92 ≦ maximum arc length K4 of both ends of the adhesive 92

  The reason why the arc length K4 at both ends of the adhesive member is larger than the arc length K3 at the center portion of the adhesive member is that the both ends of the light emitting unit 60 are pressed against the inner surface of the glass tube 56 as described in Step 6. This is because of adhering to the glass tube 56.

The features of this embodiment will be described below. In this embodiment, the glass tube 56 is also called a translucent cover.
1. A heat conductive medium (heat sink 54) on which the LED substrate 52 is mounted is inserted into the cylindrical translucent cover, and then the heat sink 54 is bonded to the translucent cover and further fixed with a base from both ends.
2. The translucent cover has a diffusion film 90 applied on the inner surface.
However, the adhesion portion of the light-transmitting cover to the heat sink is an opening 91 (aperture portion) to which the diffusion film 90 is not applied.
3. The translucent cover and the heat sink are bonded and fixed to the opening 91 in the full length direction of the heat sink by applying an adhesive or applying a double-sided adhesive tape. The heat sink 54 is fixed by caps 55 from both ends, and the outer peripheral surface (bottom) of the arc-shaped portion 63 of the heat sink 54 is fixed to the glass tube 56 by an adhesive 92.
That is, the heat sink 54 has a double fixing structure including the base 55 and the adhesive 92. However, fixing with the base 55 is the main, and the adhesive 92 is auxiliary.
4). The arc length K2 of the opening 91 is narrower than the arc length K1 of the heat sink 54 and wider than the arc length K3 of the bonded portion. Therefore, it is possible to obtain a straight tube type LED lamp having good adhesion and heat dissipation of the heat sink 54, a wide irradiation angle of the LED, and good light diffusibility.
5). The heat sink 54 is substantially in close contact with the inner surface of the cylindrical translucent cover with the adhesive 92 or the double-sided adhesive tape 93 in the entire length direction. For this reason, the adhesiveness and heat dissipation of the heat sink 54 are high.
6). The arc length ratio between the arc length K3 of the bonded portion formed by the adhesive application width and the arc length of the outer peripheral surface of the arc-shaped portion 63 of the heat sink 54 (the arc length of the lower surface) K1 is 0 in the overall heat sink direction excluding the heat sink end. 0.04 to 0.5. More preferably, it is 0.17 to 0.5. Details will be described later.
The reason why the lower limit is set to 0.04 is to ensure adhesion and heat dissipation of the heat sink. More preferably 0.17 or more.
The upper limit is set to 0.5 because the opening 91 must be equal to or shorter than the arc length K1 of the lower surface of the heat sink 54, and the coating width arc length K3 is half of the arc length K1 of the lower surface of the heat sink 54. This is because the dispersion of the coating width of the agent 92 is absorbed.
In particular, since the adhesive 92 spreads about twice as large as the central portion at the end, the upper limit is set to 0.5 (half), and the adhesive 92 is applied to the end of the heat sink 54 over the arc length K1 of the lower surface of the heat sink 54. The presence of the width arc length K3 is prevented.
7). The ratio between the arc length K3 of the bonded portion formed by the tape width of the double-sided adhesive tape 93 and the arc length K1 of the lower surface of the heat sink 54 is 0.17 to 1.0 in the overall heat sink direction. More preferably, it is 0.5 to 1.0.
The lower limit is set to 0.17 in order to ensure the adhesion and heat dissipation of the heat sink 54. More preferably 0.19 or more.
The upper limit is set to 1.0 because the opening 91 must be less than or equal to the arc length K1 of the lower surface of the heat sink 54, but the double-sided adhesive tape 93 has no tape width variation.
8). The adhesive is preferably silicone.
9. The thermal conductivity of silicone is preferably 0.15 W / m · K or more.
10. The double-sided adhesive tape is preferably a heat conductive tape.
11. The thermal conductivity of the heat conductive tape is preferably 0.2 W / m · K or more.

Below, the specification of the illumination lamp 50 is demonstrated.
1. The width of the heat sink 54 is determined by the irradiation angle (substrate width) and the effect of heat conduction (heat capacity).
2. The translucent cover is, for example, a glass tube or a resin tube, and has a tube outer diameter of 25.5 mm, a tube inner diameter of about 24 mm, and a tube wall thickness of 0.76 mm. This translucent cover corresponds to a T8 straight tube fluorescent lamp.
3. In the case of silicone, the arc length K3 of the application width of the bonded portion is about 8 mm at the portion excluding the end portion and about 15 mm at the end portion. Since the end portion is crimped, the arc length of the coating width is expanded about twice.
4). In the case of the double-sided adhesive tape 93, the tape width (arc length K3) is preferably 10 mm or more.
5). The arc length K3 of the bonded portion (or the arc length ratio between the arc length K1 of the heat sink 54 and the arc length K3 of the bonded portion) is determined by the adhesive strength and the thermal conductivity of the bonded portion. You may use the double-sided adhesive tape 93 and the adhesive agent 92 together.
6). The smaller the gap between the glass tube 56 and the heat sink 54, the better. Basically, the glass tube 56 and the heat sink 54 are brought into close contact with each other. However, the thickness of the double-sided pressure-sensitive adhesive tape 93 or the adhesive 92 exists between the glass tube 56 and the heat sink 54. Or there is variation due to the deflection of the heat sink 54.

  Hereinafter, the arc length ratio between the arc length K3 of the adhesive member 59 and the arc length K1 of the heat sink 54 will be described with reference to FIGS.

The meanings of the symbols shown in FIG. 8 are as follows.
r: inner diameter radius of translucent cover (assuming r = inner diameter R1 of glass tube 56 = outer radius R2 of arcuate portion 63)
b: Heat sink width (string length, that is, width between both ends of the arc-shaped portion 63 of the heat sink 54)
2θ: center angle of heat sink width b (center angle formed by both ends of arc-shaped portion 63 of heat sink 54)

Example 1. (In the case of adhesive 92)
As shown in FIG. 9, when the width of the heat sink 54 is 20 mm, the arc length K1 of the heat sink is 23.64 mm.

FIG. 10 shows the arc length ratio, the adhesiveness, and the LED chip temperature when the width b of the heat sink 54 is 20 mm.
The adhesiveness of the adhesive 92 is determined by the peeled state of the adhesive 92 or the peeled state of the heat sink 54 after the transportation test. Under the conditions of each arc length ratio, 10 samples each of which fixed both sides of the heat sink with the cap by the method shown in FIG. 4 and non-fixed samples were made, and peeling of the heat sink adhesion or heat sink was observed after the transportation test The number of missing samples was confirmed.
The LED chip temperature is based on the fact that the temperature in the center in the longitudinal direction is 80 degrees Celsius or less. Considering the arrangement of the LEDs, the LED chip temperature at the end portion does not become higher than the LED chip temperature at the central portion, and the temperature at the central portion is considered to be the highest temperature.

  FIG. 11 shows the relationship between the LED chip temperature at the center and the arc length ratio. As the arc length ratio increases, the heat dissipation increases and the LED chip temperature decreases.

If the arc length ratio is 0.04 or more,
When there is fixing by the base, peeling of the adhesive 92 and the heat sink 54 is not seen,
LED chip temperature becomes 76 degrees or less,
Adhesion and heat dissipation can be maintained.

If the arc length ratio is 0.17 or more,
When there is no fixing by the base, peeling of the adhesive 92 and the heat sink 54 is not seen,
LED chip temperature becomes 68 degrees or less,
Adhesion and heat dissipation can be maintained.

On the other hand, if the arc length ratio exceeds 0.51, the arc length K4 at both ends of the adhesive member may exceed the arc length K1 of the heat sink.
There is no problem if the arc length K4 of both ends of the adhesive member exceeds the arc length K2 of the opening of the diffusion film and the opening 91 and the adhesive 92 overlap, but if the arc length K1 of the heat sink exceeds the arc length K1, The adhesive 92 is placed on the diffusion film 90 and the diffusion effect is reduced.

As described above, when the width b of the heat sink 54 is 20 mm, the arc length ratio is preferably 0.04 or more and 0.51 (or 0.5) or less.
Desirably, it is 0.17 or more and 0.51 (or 0.5) or less.
Furthermore, 0.34 (about + -10%) is desirable.

Example 2 (In the case of adhesive 92)
As shown in FIG. 12, when the width b of the heat sink 54 is 15 mm,
The arc length K1 of the heat sink is 16.20 mm.

FIG. 13 shows a case where the width of the heat sink 54 is 15 mm.
FIG. 14 shows the relationship between the LED chip temperature at the center and the arc length ratio. As the arc length ratio increases, the heat dissipation increases and the LED chip temperature decreases.

If the arc length ratio is 0.04 or more,
When there is fixing by the base, peeling of the adhesive 92 and the heat sink 54 is not seen,
LED chip temperature is 79 degrees or less,
Adhesion and heat dissipation can be maintained.

If the arc length ratio is 0.19 or more,
When there is no fixing by the base, peeling of the adhesive 92 and the heat sink 54 is not seen,
LED chip temperature becomes 68 degrees or less,
Adhesion and heat dissipation can be maintained.

When the arc length ratio exceeds 0.56,
The arc length K4 at both ends of the adhesive member is not good because it exceeds the arc length K1 of the heat sink.

As described above, when the width b of the heat sink 54 is 15 mm, the arc length ratio is preferably 0.04 or more and 0.56 (or 0.5) or less.
Desirably, it is 0.19 or more and 0.56 (or 0.5) or less.
Furthermore, 0.31 (about + -10%) is desirable.

Example 3 (In the case of adhesive 92)
As shown in FIG. 15, when the width b of the heat sink 54 is 25 mm,
The arc length K1 of the heat sink is 29.30 mm.

FIG. 16 shows a case where the width b of the heat sink 54 is 25 mm.
FIG. 17 shows the relationship between the LED chip temperature at the center and the arc length ratio. As the arc length ratio increases, the heat dissipation increases and the LED chip temperature decreases.

If the arc length ratio is 0.04 or more,
When there is fixing by the base, peeling of the adhesive 92 and the heat sink 54 is not seen,
LED chip temperature is 74 degrees or less,
Adhesion and heat dissipation can be maintained.

If the arc length ratio is 0.17 or more,
When there is no fixing by the base, peeling of the adhesive 92 and the heat sink 54 is not seen,
LED chip temperature becomes 67 degrees or less,
Adhesion and heat dissipation can be maintained.

When the arc length ratio exceeds 0.51,
The arc length K4 at both ends of the adhesive member is not good because it exceeds the arc length K1 of the heat sink.

As described above, when the width b of the heat sink 54 is 25 mm, the arc length ratio is preferably 0.04 or more and 0.51 (or 0.5) or less.
Desirably, it is 0.17 or more and 0.51 (or 0.5) or less.
Furthermore, 0.38 (about + -10%) is desirable.

Example 4 (In the case of double-sided adhesive tape 93)
As shown in FIG. 9, when the width b of the heat sink 54 is 20 mm,
The arc length K1 of the heat sink is 23.64 mm.

FIG. 18 shows the case where the width b of the heat sink 54 is 20 mm.
FIG. 19 shows the relationship between the LED chip temperature at the center and the arc length ratio. As the arc length ratio increases, the heat dissipation increases and the LED chip temperature decreases.
If the arc length ratio is 0.17 or more,
Whether the adhesive 92 or the heat sink 54 is peeled off, whether or not there is fixing by a base,
LED chip temperature becomes 68 degrees or less,
Adhesion and heat dissipation can be maintained.

When the arc length ratio is 0.51 or more,
The LED chip temperature is preferably 60 degrees or less.
As described above, when the width b of the heat sink 54 is 20 mm, the arc length ratio is preferably 0.17 or more and 1.0 or less.
Desirably, it is 0.51 or more and 1.0 or less.
In order to improve workability in which the double-sided pressure-sensitive adhesive tape 93 is disposed only in the opening 91, it is desirable that the openings 91 are open on both sides of the double-sided pressure-sensitive adhesive tape 93 with a margin. 51 or more and 0.85 or less are good, and 0.64 (about + -10%) is good.

Example 5 FIG. (In the case of double-sided adhesive tape 93)
As shown in FIG. 12, when the width b of the heat sink 54 is 15 mm,
The arc length K1 of the heat sink is 16.2 mm.

FIG. 20 shows a case where the width b of the heat sink 54 is 15 mm.
FIG. 21 shows the relationship between the LED chip temperature at the center and the arc length ratio. As the arc length ratio increases, the heat dissipation increases and the LED chip temperature decreases.

If the arc length ratio is 0.19 or more,
Whether the adhesive 92 or the heat sink 54 is peeled off, whether or not there is fixing by a base,
LED chip temperature becomes 68 degrees or less,
Adhesion and heat dissipation can be maintained.

When the arc length ratio is 0.56 or more,
The LED chip temperature is preferably 61 degrees or less.

As described above, when the width of the heat sink 54 is 15 mm, the arc length ratio is preferably 0.19 or more and 1.0 or less.
Desirably, it is 0.56 or more and 1.0 or less.
In order to improve the workability of arranging the double-sided adhesive tape 93 only in the opening 91, the arc length ratio is preferably 0.56 or more and 0.86 or less, and preferably 0.68 (about + -10%).

  In the case of the structure in which both ends of the heat sink are fixed with a base as in the first and second embodiments, the application width of the adhesive 92 or the adhesive area of the double-sided adhesive tape 93 can be reduced. The adhesive member 59 or the adhesive member 59 such as the double-sided adhesive tape 93 serves only as a heat conduction medium for preventing the rattling of the heat sink during lamp transportation (preventing cracking due to the heat sink hitting the glass) and for releasing the heat of the heat sink to the glass tube. . The heat sink 54 is fixed to the glass tube 56 by a base 55, and the adhesive 92 or the double-sided adhesive tape 93 has a function of auxiliary fixing.

  Therefore, according to this embodiment, in order to fix the heat sink 54 to the glass tube 56, a complicated structure such as providing an LED substrate support portion on the inner surface of the translucent cover is not required. Further, according to this embodiment, a complicated structure such as providing a heat sink support member or a substrate support member inside the translucent cover is not required.

  According to this embodiment, a straight tube LED lamp having a simple structure, low cost, good heat dissipation, a wide LED irradiation angle, and good light diffusibility can be obtained.

As described above, in Embodiment 3, the following illumination lamp 50 has been described.
The illumination lamp 50
A translucent cover (glass tube 56, tube);
A diffusion film 90 formed on the inner peripheral surface of the tube (translucent cover, glass tube 56) and having an opening 91 over the longitudinal direction of the tube (translucent cover, glass tube 56);
A heat sink 54 having an arcuate portion 63 along the inner peripheral surface of the tube (translucent cover, glass tube 56) and extending in the longitudinal direction of the tube (translucent cover, glass tube 56); ,
An adhesive member 59 that is provided in the opening 91 of the diffusion film 90 and adheres the inner surface of the cylindrical tube (translucent cover, glass tube 56) and the arc-shaped portion 63 of the heat sink 54;
A cap 55 is attached to the end of the tube (translucent cover, glass tube 56) and fixes the heat sink 54.

In such a cross section orthogonal to the longitudinal direction of the tube (translucent cover, glass tube 56) of the illumination lamp 50,
Arc length K3 of adhesive member 59 ≦ arc length K2 of opening 91 of diffusion film 90 ≦ arc length K1 of arc-shaped portion 63 of heat sink 54
It is characterized by that.

The adhesive member 59 is an adhesive 92,
The arc length ratio between the arc length K3 of the adhesive 92 and the arc length K1 of the heat sink 54 is 0.04 or more and 0.5 or less.

  The arc length ratio between the arc length K3 of the adhesive 92 and the arc length K1 of the heat sink 54 is 0.17 or more and 0.5 or less.

The adhesive member 29 is a double-sided adhesive tape 93,
The arc length ratio between the arc length K3 of the double-sided adhesive tape 93 and the arc length K1 of the heat sink 54 is 0.17 or more and 1.0 or less.

  The arc length ratio between the arc length K3 of the double-sided adhesive tape 93 and the arc length K1 of the heat sink 54 is 0.5 or more and 0.85 or less.

  As described above, the illumination lamp of the above embodiment is
  A tube,
  A heat sink extending over the longitudinal direction of the tube
With
  The tube has a protruding portion that bulges in the inner direction of the tube on the inner surface of the end,
  The length L2 of the heat sink is shorter than the length L1 of the tube, and extends to the central portion other than the end where the protruding portion exists,
  The heat sink has an arcuate portion disposed along the inner peripheral surface of the tube, and the thickness H2 of the arcuate portion is greater than the height H3 of the protruding portion.
It is characterized by that.

  The illumination lamp further includes:
  Attached to the end of the tube and equipped with a base for fixing the heat sink,
  The heat sink has a D-shaped cross section perpendicular to the longitudinal direction, and has a hollow portion inside.
  The base is
  The inner wall of the base,
  An abutting part that projects from the inner wall of the base in the longitudinal direction of the tube and abuts at least a part of the end of the heat sink;
  A fitting portion that protrudes further from the abutting portion in the longitudinal direction of the tube and is inserted into the hollow portion of the heat sink;
Have
  The abutting outer peripheral portion closest to the cylindrical tube of the abutting portion is separated from the inner surface of the cylindrical tube by a predetermined distance H1 so as not to contact the protruding portion,
  The fitting outer peripheral part closest to the tube of the fitting part is separated from the inner surface of the tube by the predetermined distance H1 or more.
It is characterized by that.

  Moreover, the illumination lamp of the said embodiment is
  A tube,
  A heat sink extending over the longitudinal direction of the tube;
  A base attached to the end of the tube and fixing the heat sink
With
  The tube has a protruding portion that bulges in the inner direction of the tube on the inner surface of the end,
  The heat sink is shorter than the length of the tube and extends to the central portion other than the end where the protruding portion exists,
  The base protrudes in the longitudinal direction of the tube and has a fixing portion for fixing the heat sink.
  The outer peripheral portion that is closest to the cylindrical tube of the fixed portion is characterized by being separated from the inner surface of the cylindrical tube by a predetermined distance H1 or more so as not to contact the protruding portion.

  Moreover, the illumination lamp of the said embodiment is
  In an illumination lamp having a predetermined length,
  A tube,
  A heat sink extending over the longitudinal direction of the tube;
  A base attached to the end of the tube and fixing the heat sink
With
  The heat sink is shorter than the length of the tube and extends to the center of the tube,
  The base has an abutment surface that is inserted into the inside of the tube from the end of the tube and is abutted against the end surface of the heat sink,
  The predetermined length is determined by the length from the end face of the base to the abutting surface and the length of the heat sink.
It is characterized by that.

  The heat sink has a D-shaped cross section perpendicular to the longitudinal direction and has a hollow portion inside, and has a hole opened from the hollow portion toward the outside.
  The base is
  A fitting part to be inserted into the hollow part of the heat sink;
  A fitting claw that protrudes from the fitting part and fits into the hole
It is characterized by having.

  The tube is fixed to the base with an adhesive,
  The cylindrical end surface of the cylindrical tube and the inner wall of the base are arranged apart from each other by a predetermined distance L4 in the longitudinal direction of the cylindrical tube,
  The fitting claw and the hole have a predetermined tolerance in the longitudinal direction of the tube.
It is characterized by that.

  50 illumination lamp, 51 LED, 52 substrate, 54 heat sink, 55 base, 56 glass tube, 57 adhesive, 58 power supply terminal, 59 adhesive member, 60 light emitting part, 61 hole, 62 flat plate part, 63 arc-shaped part, 64 hollow part , 70 cover part, 71 upper base, 72 lower base, 73 base end face, 74 inner wall, 75 abutting part, 76 abutting surface, 77 fitting part, 78 fitting claw, 79 resin hollow part, 80 fixing part, 81 Protruding part, 82 abutting outer peripheral part, 83 fitting outer peripheral part, 84 outer peripheral part, 85 end face, 86 cylinder end face, 90 diffusion film, 91 opening part, 92 adhesive, 93 double-sided adhesive tape.

Claims (2)

A tube,
A heat sink extending over the longitudinal direction of the tube ;
A base attached to the end of the tube and fixing the heat sink ;
The tube has a protruding portion that bulges in the inner direction of the tube on the inner surface of the end,
The length L2 of the heat sink is shorter than the length L1 of the tube, and extends to the central portion other than the end where the protruding portion exists,
The heat sink has an arcuate portion disposed along the inner peripheral surface of the cylindrical tube, rather greater than the height H3 of the arcuate portion thickness H2 is ledge,
The heat sink has a D-shaped cross section perpendicular to the longitudinal direction, and has a hollow portion inside.
The base is
The inner wall of the base,
An abutting portion that projects from the inner wall of the base in the longitudinal center direction of the cylindrical tube and abuts at least a part of the end of the heat sink;
A fitting part that protrudes further from the abutting part in the longitudinal center direction of the tube and is inserted into the hollow part of the heat sink;
Have
The abutting outer peripheral portion closest to the cylindrical tube of the abutting portion is separated from the inner surface of the cylindrical tube by a predetermined distance H1 so as not to contact the protruding portion,
The illumination lamp characterized in that the fitting outer peripheral portion closest to the tube of the fitting portion is separated from the inner surface of the tube by the predetermined distance H1 or more . A tube,
A heat sink extending over the longitudinal direction of the tube;
It is attached to the end of the tube and has a base for fixing the heat sink,
The tube has a protruding portion that bulges in the inner direction of the tube on the inner surface of the end,
The heat sink is shorter than the length of the tube and extends to the central portion other than the end where the protruding portion exists,
The base protrudes in the longitudinal direction of the tube and has a fixing portion for fixing the heat sink.
The outer peripheral portion closest to the tube of the fixed portion is separated from the inner surface of the tube by a predetermined distance H1 or more so as not to contact the protruding portion ,
The heat sink has a D-shaped cross section perpendicular to the longitudinal direction, and has a hollow portion inside.
The base has an inner wall of the base,
The fixing part of the base is
An abutting portion that projects from the inner wall of the base in the longitudinal center direction of the cylindrical tube and abuts at least a part of the end of the heat sink;
A fitting part that protrudes further from the abutting part in the longitudinal center direction of the tube and is inserted into the hollow part of the heat sink;
Have
The abutting outer peripheral portion closest to the cylindrical tube of the abutting portion is separated from the inner surface of the cylindrical tube by a predetermined distance H1 so as not to contact the protruding portion,
The illumination lamp characterized in that the fitting outer peripheral portion closest to the tube of the fitting portion is separated from the inner surface of the tube by the predetermined distance H1 or more .

Images