CN107208851B

CN107208851B - Illumination lamp, cover for illumination lamp, and illumination device

Info

Publication number: CN107208851B
Application number: CN201580075731.5A
Authority: CN
Inventors: 西冈恒人
Original assignee: Mitsubishi Electric Corp; Mitsubishi Electric Lighting Corp
Current assignee: Mitsubishi Electric Corp; Mitsubishi Electric Lighting Corp
Priority date: 2015-02-23
Filing date: 2015-02-23
Publication date: 2020-07-24
Anticipated expiration: 2035-02-23
Also published as: JPWO2016135768A1; JP6334804B2; CN107208851A; WO2016135768A1

Abstract

An illumination lamp is obtained in which light emitted from a light source is efficiently used as light emitted from the illumination lamp, and the luminous efficiency is improved. The illumination lamp of the present invention is characterized by comprising: a light source module (3) having an elongated shape and having a light source (4) arranged on a surface parallel to the longitudinal direction; the cover (2) is provided with a cylindrical part (21) and a holding protrusion part (22), wherein the cylindrical part (21) is in a long strip shape, covers the surface of the light source module (3) on the light emitting side of the light source (4) and has light transmittance, the holding protrusion part (22) protrudes towards the inner side of the cylindrical part (21), the reflectivity of the emitting side plane (22a) of the holding protrusion part (22) is higher than that of the cylindrical part (21), and the appliance side plane (22b) of the holding protrusion part (22) is abutted with the light source module (3).

Description

Illumination lamp, cover for illumination lamp, and illumination device

Technical Field

The present invention relates to an illumination lamp, a cover for an illumination lamp used for the illumination lamp, and an illumination device using the illumination lamp.

Background

In recent years, with a demand for environmental attention, illumination lamps and lighting devices have been increasingly used, which use, as a light source, a light Emitting Diode (L light Emitting Diode; hereinafter, referred to as L ED), which is one of solid-state light Emitting elements having a longer life and lower power consumption than conventional incandescent bulbs and fluorescent lamps.

As an illumination lamp using L ED, for example, patent document 1 discloses a configuration including a light emitting portion using L ED, a heat sink (corresponding to a heat transfer member of patent document 1) having an arrangement surface on which the light emitting portion is arranged, an elongated cover made of a translucent resin material and housing the light emitting portion and the heat sink, and a pair of caps attached to both ends of the cover in the longitudinal direction, wherein the cover of the illumination lamp of patent document 1 is formed in a cylindrical shape, a pair of holding projections (corresponding to first ribs of patent document 1) are projected from the peripheral wall thereof, and the heat sink is fixed inside the cover in a state where the holding projections are in contact with the arrangement surface of the heat sink.

Prior art documents

Patent document

Patent document 1: japanese patent No. 5347085

Disclosure of Invention

Problems to be solved by the invention

The cover of patent document 1 is made of a light-transmitting resin material, and a part of the light emitted from L ED is reflected by the cover toward the heat sink or the holding protrusion, and most of the reflected light is absorbed by the heat sink or the holding protrusion, and the absorbed light remains inside the illumination lamp, and therefore, the light cannot be used as illumination light for illuminating the illumination space, that is, the invention of patent document 1 has room for improvement in light emission efficiency of the illumination lamp.

The present invention has been made in view of the above-described problems, and provides an illumination lamp that improves light utilization efficiency by efficiently using light emitted from a light source as illumination light of the illumination lamp, a cover for the illumination lamp that is used in the illumination lamp and that can efficiently use light emitted from the light source as illumination light of the illumination lamp, and an illumination device using the illumination lamp.

Means for solving the problems

The illumination lamp of the present invention is characterized by comprising: a light source module having a strip shape and a light source arranged on a surface parallel to the longitudinal direction; and a cover having a holding protrusion and an elongated light transmitting portion, the light transmitting portion covering a surface on a light emitting side from which light from the light source is emitted, among surfaces of the light source module, the holding protrusion protruding inward of the light transmitting portion, a surface on the light emitting side of the holding protrusion having a higher reflectance than the light transmitting portion, and a surface opposite to the surface on the light emitting side of the holding protrusion abutting against the light source module.

Further, the illumination lamp cover according to the present invention includes: a light transmitting portion that covers a surface on a light emitting side from which light from the light source is emitted, among surfaces of the light source module, the light source module being long-strip-shaped and having the light source provided on a surface parallel to a longitudinal direction; and a holding protrusion portion protruding toward the inside of the light transmitting portion, having a higher reflectance of an emission-side surface than the light transmitting portion, and abutting against the light source module on a surface opposite to the emission-side surface.

Further, an illumination device according to the present invention includes: a light source module having a strip shape and a light source arranged on a surface parallel to the longitudinal direction; a cover having a holding protrusion and an elongated light transmitting portion, the light transmitting portion covering a surface on a light emitting side from which light from the light source is emitted, among surfaces of the light source module, the holding protrusion protruding toward an inner side of the light transmitting portion, a reflectance of a surface on the light emitting side of the holding protrusion being higher than that of the light transmitting portion, and a surface opposite to the surface on the light emitting side of the holding protrusion abutting against the light source module; and a power supply device for supplying power to the light source.

Effects of the invention

In the illumination lamp, the illumination lamp cover, and the illumination device according to the present invention, since the other surface of the holding protrusion of the cover has a higher reflectance than the translucent portion, light emitted from the light source module and reflected by the translucent portion toward the holding protrusion is reflected again by the holding protrusion, and light emitted from the light source can be efficiently used, thereby achieving an effect of improving the light emission efficiency of the illumination lamp.

Drawings

Fig. 1 is a perspective view of a lighting device of the present invention.

Fig. 2 is a perspective view of the illumination lamp according to embodiment 1.

Fig. 3 is a cross-sectional view of section a-a in fig. 2 showing the illumination lamp according to embodiment 1.

Fig. 4 is a perspective view of the cover according to embodiment 1 as seen from one end portion (the side of the base point of arrow X).

Fig. 5 is a perspective view of the cover according to embodiment 1 as seen from the other end (the tip side of arrow X).

Fig. 6 is a perspective view of the heat sink according to embodiment 1 as viewed from one end portion (from the base point side of arrow X).

Fig. 7 is a perspective view of the heat sink according to embodiment 1, as seen from the other end (the tip side of arrow X).

Fig. 8 is a cross-sectional view showing a light path of the illumination lamp according to embodiment 1.

Fig. 9 is a sectional view of an illumination lamp according to a first modification of embodiment 1.

Fig. 10 is a sectional view of an illumination lamp according to a second modification of embodiment 1.

Fig. 11 is a sectional view of an illumination lamp according to a third modification of embodiment 1.

Fig. 12 is a sectional view of an illumination lamp according to a fourth modification of embodiment 1.

Fig. 13 is a sectional view of an illumination lamp according to a fifth modification of embodiment 1.

Fig. 14 is a perspective view of a heat sink according to a fifth modification of embodiment 1, as viewed from one end portion (from the base point side of arrow X).

Fig. 15 is a perspective view of a heat sink according to a fifth modification of embodiment 1, as viewed from the other end (the tip side of arrow X).

Fig. 16 is a sectional view of an illumination lamp according to a sixth modification of embodiment 1.

Fig. 17 is a sectional view of an illumination lamp according to a seventh modification of embodiment 1.

Fig. 18 is a sectional view of an illumination lamp according to an eighth modification of embodiment 1.

Fig. 19 is a sectional view of an illumination lamp according to a ninth modification of embodiment 1.

Fig. 20 is a perspective view of the illumination lamp according to embodiment 2.

Fig. 21 is a sectional view of the illumination lamp according to embodiment 2 taken along the line B-B in fig. 20.

Fig. 22 is a side view of the illumination lamp of embodiment 2.

Fig. 23 is a perspective view of an illumination lamp according to embodiment 3.

Fig. 24 is a cross-sectional view taken along line C-C in fig. 23 showing an illumination lamp according to embodiment 3.

Fig. 25 is a side view of the illumination lamp of embodiment 3.

Fig. 26 is a sectional view of the illumination lamp of embodiment 4.

Fig. 27 is a side view of the illumination lamp of embodiment 4.

Fig. 28 is a perspective view of the cover according to embodiment 4 as seen from one end portion (the side of the base point of arrow X).

Fig. 29 is a perspective view of the cover according to embodiment 4 as seen from the other end (the tip side of arrow X).

Fig. 30 is a sectional view of an illumination lamp according to a first modification of embodiment 4.

Fig. 31 is a sectional view of an illumination lamp according to a second modification of embodiment 4.

Fig. 32 is a perspective view of the cover according to the second modification of embodiment 4, as seen from one end portion (the base point side of arrow X).

Fig. 33 is a perspective view of the cover according to the second modification of embodiment 4, as seen from the other end (the tip side of arrow X).

Fig. 34 is a sectional view of the illumination lamp of embodiment 5.

Fig. 35 is a sectional view of the illumination lamp of embodiment 6.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals. In the description of the embodiments, the description of the same or corresponding portions will be omitted or simplified as appropriate. In the drawings, the arrow X, the arrow Y, and the arrow Z are defined as 3-axis directions of orthogonal coordinate systems that are orthogonal to each other, but this is described for convenience of explanation, and the arrangement, orientation, and the like of the devices, the instruments, the components, and the like are not limited. The structure of the device, the appliance, the member, and the like can be appropriately changed in material, shape, size, and the like within the scope of the present invention.

Embodiment 1.

Fig. 1 is a perspective view of a lighting device of the present invention. The illumination device 100 includes: an elongated illumination lamp 1 that is lit by being supplied with electric power; and a lighting fixture 101 capable of mounting the illumination lamp 1 and supplying power to the illumination lamp 1. The lighting device 100 is attached to a ceiling or a wall surface so that the illumination lamp 1 faces the inside of a room, and illuminates the illumination lamp 1 to irradiate light into the inside of the room.

The lighting fixture 101 includes a fixture body 102, a holding socket 103, a power supply socket 104, and a power supply box 105. The device body 102 has a hollow, elongated box-like shape. The appliance main body 102 has a mounting tool (not shown) such as a V-spring or a joint, and is mounted on a ceiling or a wall surface using the mounting tool.

On the surface of the device body 102 on the side where the illumination lamp 1 is mounted, a holding socket 103 is provided so as to protrude in the vicinity of one end in the longitudinal direction (the direction of the arrow X), and a power supply socket 104 is provided so as to protrude in the vicinity of the other end in the longitudinal direction (the direction of the arrow X). The distance between the holding socket 103 and the power supply socket 104 is substantially equal to the length of the illumination lamp 1 in the longitudinal direction, and the holding socket 103 and the power supply socket 104 can hold the illumination lamp 1. The power supply socket 104 is electrically connected to the held illumination lamp 1.

Further, a power supply box 105 is housed inside the device main body 102. The power supply box 105 includes a power supply device (not shown) that receives power supply from an external power supply and converts the power supply into a voltage or current suitable for the illumination lamp 1. The power supply device is electrically connected to the power supply socket 104, and can supply electric power to the illumination lamp 1 via the power supply socket 104.

Fig. 2 is a perspective view of the illumination lamp according to embodiment 1. Fig. 3 is a cross-sectional view of section a-a in fig. 2 showing the illumination lamp according to embodiment 1. In fig. 2, a part of the cover 2 is omitted for explaining the inside of the cover 2. The illumination lamp 1 of embodiment 1 includes: a cover 2 having a long hollow cylindrical shape and having both ends open in the longitudinal direction (the direction of arrow X); a light source module 3 which is composed of a light source 4, a substrate 5, and a heat sink 6 and is held inside the cover 2; a holding base 7 attached to one end portion in the longitudinal direction of the cover 2; and a power supply base 8 attached to the other end portion of the cover 2 in the longitudinal direction. As shown in fig. 3, in a direction (direction of arrow Z) perpendicular to the longitudinal direction of the illumination lamp 1, a side on which light is emitted from a light source 4 described later is referred to as an emission side (tip side of arrow Z), and an opposite side to the emission side is referred to as an appliance side (base point side of arrow Z). That is, the illumination lamp 1 is attached to the lighting apparatus 101 so that the apparatus side (the base point side of the arrow Z) of the illumination lamp 1 faces the lighting apparatus 101.

Fig. 4 is a perspective view of the cover according to embodiment 1 as seen from one end portion (the side of the base point of arrow X). Fig. 5 is a perspective view of the cover according to embodiment 1 as seen from the other end (the tip side of arrow X). The cover 2 is formed with: an elongated cylindrical portion 21; a pair of injection-side holding protrusions 22 protruding from the inner circumferential surface of the cylindrical portion 21 toward the inside of the cylindrical portion 21; and a pair of device-side holding protrusions 23 that also protrude from the inner circumferential surface of the cylindrical portion 21. Both ends of the cover 2 in the longitudinal direction (the direction of arrow X) are open. The injection-side holding projection 22 and the device-side holding projection 23 are formed so as to extend in the entire longitudinal direction of the cover 2, and the shape of a cross section obtained by cutting the cover 2 perpendicularly to the longitudinal direction always has the cross-sectional shape shown in fig. 3 regardless of the position in the longitudinal direction. The injection-side holding projection 22 corresponds to the holding projection of the present invention.

Of the surfaces of the emission-side holding protrusion 22 parallel to the longitudinal direction (the direction of the arrow X) of the cylindrical portion 21, the emission-side surface is referred to as an emission-side flat surface 22a, the device-side surface is referred to as a device-side flat surface 22b, and the surface between the emission-side flat surface 22a and the device-side flat surface 22b is referred to as a distal end surface 22 c. The emission-side plane 22a of the emission-side holding projection 22 is substantially parallel to the device-side plane 22 b. When the light source module 3 is fixed inside the cover 2, the emission-side holding projection 22 is formed such that the emission-side flat surface 22a is positioned closer to the fixture than an emission-side surface of the light source 4 described later. The emission-side holding projection 22 and the device-side holding projection 23 are located at positions offset toward the device side from a central axis O (see fig. 3) parallel to the longitudinal direction of the cover 2. The central axis O of the cover 2 is also the central axis of the illumination lamp 1.

In the cover 2, the cylindrical portion 21, the instrument-side holding protrusion 23, and the injection-side holding protrusion 22 are formed of different materials. Here, the material used for forming the cylindrical portion 21 and the tool-side holding protrusion 23 is referred to as a first cover material, and the material used for forming the injection-side holding protrusion 22 is referred to as a second cover material. The cylindrical portion 21, the injection-side holding protrusion 22, and the device-side holding protrusion 23 are integrated, although the cylindrical portion 21, the device-side holding protrusion 23, and the injection-side holding protrusion 22 are formed of different materials.

The first cover material is a material having light transmittance. As the first cover material, for example, a resin having light transmittance such as polycarbonate or acrylic resin can be used. In embodiment 1, a high light-diffusing resin material in which a resin having light transmittance such as polycarbonate is used as a base material and a diffusing agent having a refractive index different from that of the base material is mixed at a predetermined weight ratio is used as the first cover material. The cylindrical portion 21 is formed of a high light-diffusing resin material, and therefore has light-diffusing properties for diffusing light. The cylindrical portion 21 is made of a first cover material having optical transparency and transmits light emitted from the light source 4, and therefore corresponds to a light-transmitting portion of the present invention.

The second cap material is a material having a higher reflectivity than the first cap material. As the second cover material, for example, a highly reflective resin material obtained by mixing a resin such as polycarbonate, acrylic resin, or polybutylene terephthalate as a base material with a material for improving reflectance such as titanium dioxide at a predetermined weight ratio can be used.

The cover 2, in which the cylindrical portion 21, the appliance-side holding protrusion 23, and the injection-side holding protrusion 22 are formed of different materials, is manufactured by two-color molding, for example. The two-color molding is a method of, for example, extruding two different resin compositions in a molten state from a plurality of different extruders, integrating the two resin compositions in 1 die connecting the plurality of extruders, and then cooling and solidifying the integrated resin compositions to obtain a composite molded article of the two resin compositions melt-bonded and integrated at an interface. In embodiment 1, the cap 2 is formed by extruding a first cap material in a molten state from an extruder for forming the cylindrical portion 21 and the tool-side holding protrusion 23, extruding a second cap material in a molten state from an extruder for forming the injection-side holding protrusion 22, and then integrating them in 1 die, followed by cooling and solidifying.

As shown in fig. 3, in embodiment 1, the thickness T of each of the cylindrical portion 21 and the injection-side holding protrusion 22 is equal to each other, and is, for example, 1[ mm ]. In embodiment 1, the distance Ri from the central axis O to the inner circumferential surface of the cylindrical portion 21 is 11.75[ mm ]. Further, a distance H from the emission-side plane 22a of the emission-side holding protrusion 22 to a plane parallel to the emission-side plane 22a and passing through the central axis O is 5.42[ mm ]. However, the dimensions of T, Ri and H are not limited to those of embodiment 1.

As shown in fig. 1 and 2, the retaining base 7 includes: a base holding frame 71 having insulation and mounted so as to cover the opening of one end of the cover 2; and a conductive holding terminal 72 that is provided upright from the base holding frame 71 along the longitudinal direction (the direction of arrow X) of the illumination lamp 1. The holding terminal 72 is integrated with the base holding frame 71. The holding terminal 72 is embedded in the base holding frame 71 by, for example, insert molding. The holder base frame 71 is provided with screw holes 73, and the shaft portions of the screws 9 having screw grooves formed therein are inserted into the screw holes 73 and screwed into the screw holes 66 of the heat sink 6 described later, whereby the holder base 7 is fixed to the light source module 3. The holding cap 7 may be fixed to the light source module 3 by using a fixing member other than a screw such as a rivet, or the holding cap 7 may be fixed to the light source module 3 by fitting, screwing, or the like without using a fixing member.

The power supply base 8 includes: a power supply base frame 81 having insulation and mounted so as to cover the opening of the other end of the cover 2; and a conductive power supply terminal 82 that is provided upright from the power supply base housing 81 along the longitudinal direction (the direction of arrow X) of the illumination lamp 1. The power supply terminal 82 is integrated with the power supply base housing 81. The power supply terminal 82 is embedded in the power supply base housing 81 by a method such as insert molding. The power supply base housing 81 is provided with a screw hole 83 (see fig. 22), and the power supply base 8 is fixed to the light source module 3 by inserting the shaft portion of the screw 9 having a screw groove into the screw hole 83 and screwing the screw into a screw hole 66 of a heat sink 6 described later. The holding cap 8 may be fixed to the light source module 3 by using a fixing member other than a screw such as a rivet, or the holding cap 8 may be fixed to the light source module 3 by fitting, screwing, or the like without using a fixing member.

Further, the holding socket 103 holds the holding terminal 72, and the power supply socket 104 holds the power supply terminal 82, whereby the lighting fixture 101 can hold the illumination lamp 1. Also, at least the power supply socket 104 is electrically connected to the power supply terminal 82 while holding the power supply terminal 82.

As shown in fig. 2 and 3, the light source module 3 includes: a light source 4; a substrate 5 having a long flat plate shape and on which the light source 4 is mounted; and a heat sink 6 that dissipates heat generated from the light source 4 to the outside of the illumination lamp 1 via the cover 2. The light source module 3 is disposed at a position where light emitted from the light source 4 is emitted to the emission side.

In embodiment 1, the light source 4 is L ED, and a pseudo white L ED. in which a phosphor for converting a blue light wavelength into a yellow light is disposed on a L ED chip for emitting blue light having a wavelength of 440 to 480nm and encapsulated is used, and it is necessary to describe that the number, the arrangement position, and the type of the light source 4 are determined depending on the application of the illumination lamp 1, and therefore, in the present invention, the number, the arrangement position, and the type of the light source 4 are not limited, and for example, a long Organic electroluminescent element (hereinafter referred to as an Organic E L element) having a length in the longitudinal direction substantially equal to the length in the longitudinal direction of the substrate 5 may be used as the light source 4, and the Organic E L element may be disposed so that the longitudinal direction thereof is parallel to the longitudinal direction of the substrate 5.

As shown in fig. 3, the light emitted from the light source 4 spreads symmetrically with respect to an axis perpendicular to the light-emitting surface at an irradiation angle α, and in embodiment 1, the irradiation angle α is 120 degrees.

Electronic components (not shown), such as diodes, capacitors, fuses, and resistors, are mounted on the mounting surface of the substrate 5 on which the light sources 4 are mounted, and wiring lines (not shown) for electrically connecting the light sources 4 and the electronic components are provided. The light sources 4 and the electronic components are electrically connected to the power supply terminal 82 via wiring lines. Therefore, electric power is supplied from the power supply apparatus to the light source 4 via the power supply socket 104, the power supply terminal 82, and the wiring line, and the light source 4 is turned on.

As the material of the substrate 5, a metal material such as a glass epoxy material, a paper phenolic material, a synthetic material, a ceramic material, or aluminum can be selected in consideration of material cost, design specifications, or the like. The mounting surface of the substrate 5 is coated with a resist having a reflectance higher than that of the material of the substrate 5.

In embodiment 1, the length dimension (the width dimension of the substrate 5) in the short side direction (the direction of the arrow Y) of the substrate 5 is 11[ mm ].

Fig. 6 is a perspective view of the heat sink according to embodiment 1 as viewed from one end portion (from the base point side of arrow X). Fig. 7 is a perspective view of the heat sink according to embodiment 1, as seen from the other end (the tip side of arrow X). The heat sink 6 is an elongated member, and is configured by integrating a light source installation portion 61, a pair of side wall portions 62, a pair of emission-side support portions 63, a pair of fixture-side support portions 64, and a pair of screw fixing portions 65. The light source installation portion 61, the side wall portion 62, the emission side support portion 63, the device side support portion 64, and the screw fixing portion 65 are formed to extend in the entire longitudinal direction (the direction of the arrow X) of the heat sink 6, and the shape of a cross section obtained by cutting the heat sink 6 perpendicularly to the longitudinal direction always assumes the shape shown in fig. 3 regardless of the position in the longitudinal direction. It is preferable that a metal material having excellent thermal conductivity and rigidity and a small linear thermal expansion coefficient is used as the material of the heat sink 6, and the heat sink 6 of embodiment 1 is formed using aluminum. A highly reflective film (not shown) having a higher reflectance than the material of the heat sink 6 is formed on the surface of the heat sink 6. The high reflection film of embodiment 1 is a white colored alumite layer.

The light source installation portion 61 has a flat plate shape, and is positioned on the surface on the emission side when the heat sink 6 is fixed inside the cover 2, and the substrate 5 is installed so that the light source 4 faces the emission side as shown in fig. 2 and 3. As a method of providing the substrate 5 to the heat sink 6, a method of bonding and fixing the substrate 5 to the heat sink by an adhesive member such as an adhesive agent or a double-sided tape, a method of providing screw holes in the substrate 5 and the heat sink 6 and screwing the substrate and the heat sink with screws, or the like can be used.

A pair of side wall portions 62 are provided upright on the surface of the light source installation portion 61 on the emission side so as to face the emission side. The interval between the side wall portions 62 is longer than at least the length dimension (the width dimension of the substrate 5) in the short side direction (the direction of the arrow Y) of the substrate 5. The substrate 5 is disposed between the pair of side wall portions 62 of the light source disposing part 61. Therefore, positioning when the substrate 5 is provided by the side wall portion 62 becomes easy. When the light source module 3 is fixed inside the cover 2, the side wall portion 62 is formed at a position facing the distal end surface 22c of the emission-side holding projection 22, and the distal end of the side wall portion 62 is positioned closer to the tool side than the emission-side surface of the light source 4.

An emission-side support portion 63 protruding outward in the short-side direction and an appliance-side support portion 64 standing upright toward the appliance side are provided at both ends of the light source installation portion 61 in the short-side direction (direction of arrow Y). When the light source module 3 is fixed inside the cover 2, the emission-side support portion 63 is formed at a position abutting on the fixture-side flat surface 22b of the emission-side holding protrusion 22, and the fixture-side support portion 64 is formed along the inner circumferential surface of the cylindrical portion 21 in a shape in which the tip of the fixture-side support portion 64 engages with the fixture-side holding protrusion 22. Further, a gap is formed between the emission-side support portion 63 and the appliance-side support portion 64 in the thickness direction (the direction of arrow Z) of the heat sink 6.

A pair of screw fixing portions 65 are provided on the surface of the light source installation portion 61 on the instrument side so as to protrude toward the instrument side. A screw hole 66 is formed between the screw fixing portions 65. The heat sink 6, which is a part of the light source module 3, is fixed to the retaining cap 70 or the power feeding cap 80 by inserting the screw 9, which is inserted into the screw hole 73 formed in the retaining cap housing 71 or the screw hole formed in the power feeding cap housing 81, into the screw hole 66. When the retaining cap 70 or the power feeding cap 80 is fixed to the heat sink 6 in a state where the heat sink 6 is fixed to the inside of the cover 2, the retaining cap 70 is fixed so as to cover one end portion of the cover 2, and the power feeding cap 80 is fixed so as to cover the other end portion of the cover 2.

As shown in fig. 2 and 3, when the holding base 7 is attached to one end portion of the cover 2 and the power feeding base 8 is attached to the other end portion, a cover inner space 24 surrounded by the cover 2, the holding base 7, and the power feeding base 8 is formed inside the cover 2. When the light source module 3 is fixed inside the cover 2, the cover interior space 24 is divided into 4 spaces by the light source module 3. Of these 4 spaces, the space facing the light source 4 is referred to as an emission-side space 25, and the remaining 3 spaces not facing the light source 4 are collectively referred to as an appliance-side space 26. The emission-side space 25 is surrounded by the inner peripheral surface of the cylindrical portion 21, the emission-side flat surface 22a of the emission-side holding protrusion 22, the light source module 3, the holding base 7, and the power supply base 8.

Fig. 8 is a cross-sectional view showing a light path of the illumination lamp according to embodiment 1. Next, light emitted from the light source 4 of embodiment 1 will be described with reference to fig. 8. In fig. 8, an arrow a indicates a path of light emitted from the light source 4, which is reflected by the cylindrical portion 21 and the emission-side holding protrusion 22 1 time each and then emitted from the cylindrical portion 21.

First, the light emitted from the light source 4 passes through the emission-side space 25 and reaches the inner circumferential surface of the cylindrical portion 21. Since the cylindrical portion 21 is formed of a first cover material having translucency, irradiation light that is transmitted through the cylindrical portion 21 and is irradiated from the cover 2 to the outside of the illumination lamp 1 and reflected light that is reflected by the cylindrical portion 21 and returned to the appliance side are generated from light that reaches the inner peripheral surface of the cylindrical portion 21. Since the cylindrical portion 21 of embodiment 1 is formed using a highly light-diffusing resin material, the irradiated light and the reflected light are diffused at various angles, but illustration thereof is omitted in fig. 8.

Part of the reflected light reflected by the cylindrical portion 21 reaches the emission-side flat surface 22a of the emission-side holding protrusion 22 as indicated by an arrow a in fig. 8. Since the emission-side holding protrusion 22 is formed of the second cover material having a higher reflectance than the first cover material, most of the reflected light reaching the emission-side flat surface 22a of the emission-side holding protrusion 22 is reflected by the emission-side flat surface 22a of the emission-side holding protrusion 22 toward the emission side. The light reflected to the emitting side by the emitting side holding protrusion 22 reaches the inner peripheral surface of the cylindrical portion 21 again, reaches the cylindrical portion 21, and the above-described emitted light and reflected light are generated again.

Here, in comparison between the illumination lamp 1 of embodiment 1 and the conventional illumination lamp in which the emission-side holding projection 22 is also formed of the first cover material, the second cover material has a higher reflectance than the first cover material, and therefore the light flux of the reflected light reflected to the emission side of the illumination lamp 1 of embodiment 1 increases. Therefore, the beam of light, which is reflected by the emission-side holding protrusion 22 of the illumination lamp 1 of embodiment 1, passes through the cylindrical portion 21, is emitted from the cover 2 to the outside of the illumination lamp 1 along the path indicated by the arrow a in fig. 8, is higher than that of the conventional illumination lamp, and the light emitted from the light source 4 can be efficiently used as the illumination light of the illumination lamp 1, so that the light emission efficiency of the illumination lamp 1 can be improved.

Further, in the illumination lamp 1 of embodiment 1, the light of the light source 4 can be irradiated from outside the range of the irradiation angle α of the light source 4 by the reflection of the cylindrical portion 21 and the emission-side holding projection 22 as the light along the path of the arrow a in fig. 8, and the irradiation angle of the illumination lamp 1 can be made wider than the irradiation angle α of the light source 4, and further, since the emission-side holding projection 22 of the illumination lamp 1 of embodiment 1 is formed of the second cover material having a higher reflectance than the first cover material, the amount of decrease in the light flux due to the reflection is smaller than in the case where the emission-side holding projection 22 is formed of the first cover material, and the decrease in the light flux of the light irradiated from outside the range of the irradiation angle α of the light source 4 can be suppressed.

In addition, in the illumination lamp 1 of embodiment 1, the outer periphery of the illumination lamp 1 is uniformly formed by the first cover material. Therefore, the illumination lamp 1 of embodiment 1 has substantially the same appearance as a conventional illumination lamp, and thus has an appearance that is less likely to cause a user to feel a sense of discomfort. Then, as shown by arrow b in fig. 8, the light that has taken a path passing through the vicinity of the base of the emission-side holding protrusion 22 is transmitted to the appliance side without being reflected by the emission-side holding protrusion 22, and is irradiated from the cover 2. Therefore, the light beam that has passed through the path near the base of the emission-side holding protrusion 22 can be prevented from being reflected by the emission-side holding protrusion 22 and from being reduced, and the light emission efficiency of the illumination lamp 1 can be improved. Further, since the light passing through the path near the base of the emission-side holding protrusion 22 is extracted and irradiated to the appliance side, the irradiation angle of the illumination lamp 1 can be further expanded.

Further, since the second cover material forming the injection-side holding protrusion 22 according to embodiment 1 does not need to have translucency as in the first cover material, other materials that improve physical properties may be mixed in addition to the material that improves reflectance. For example, a high-rigidity material such as a glass filler may be mixed to improve the rigidity of the cover 2.

The shapes of the cover 2 and the heat sink 6 are not limited to those of embodiment 1, and the emission-side holding protrusion 22 may be formed of the second cover material, and the emission-side plane 22a, which is a surface of the emission-side holding protrusion 22 on which the light source 4 emits light, faces the inside of the emission-side space 25. As examples of the shapes of the cover 2 and the heat sink 6, the first to ninth modifications of embodiment 1 will be described. In the first to ninth modifications of embodiment 1, the shapes of the cover 2 and the radiator 6 are different from each other. Since the other configurations are substantially the same as those of embodiment 1, the description thereof will be omitted.

A first modification of embodiment 1.

Fig. 9 is a sectional view of an illumination lamp according to a first modification of embodiment 1. The illuminating lamp 1a according to the first modification of embodiment 1 is different from the illuminating lamp 1 according to embodiment 1 in that the radiator 6a according to the first modification of embodiment 1 does not have a gap between the emission-side support portion 63 and the fixture-side support portion 64, and the support portion 67 functioning similarly to the emission-side support portion 63 and the fixture-side support portion 64 is formed. The shape of the cover 2a according to the first modification of embodiment 1 is substantially the same as that of the cover 2 according to embodiment 1.

The heat sink 6a according to the first modification of embodiment 1 has a shape simpler than the heat sink 6 according to embodiment 1 because the support portions 67 are formed without a gap between the injection-side support portion 63 and the appliance-side support portion 64, and improvement in formability is expected compared to the heat sink 6. Further, by eliminating the gap between the emission-side support portion 63 and the appliance-side support portion 64, the sectional area of the heat sink 6a of the first modification of embodiment 1 is larger than the sectional area of the heat sink 6 of embodiment 1, the rigidity of the heat sink is improved, and the illumination lamp 1a of the first modification of embodiment 1 is less likely to warp or bend. Further, since the heat sink 6a of the first modification of embodiment 1 has a larger heat capacity as the cross-sectional area of the heat sink is larger than the heat sink 6 of embodiment 1, the heat sink 6 takes more heat from the light source 4, and the reliability of the light source 4 is improved.

A second modification of embodiment 1.

Fig. 10 is a sectional view of an illumination lamp according to a second modification of embodiment 1. The illumination lamp 1b according to the second modification of embodiment 1 is different from the illumination lamp 1a according to the first modification of embodiment 1 in that the dimension in the thickness direction (the direction of arrow Y) of the support portion 67 of the heat sink 6b according to the second modification of embodiment 1 is smaller. That is, the support portion 67 of the heat sink 6b is thinner than the support portion 67 of the heat sink 6 a. The shape of the cover 2b according to the second modification of embodiment 1 is substantially the same as that of the cover 2 according to embodiment 1.

The heat sink 6b according to the second modification of embodiment 1 has a shape simpler than that of the heat sink 6 according to embodiment 1, and is expected to have improved formability compared with the heat sink 6, as in the first modification of embodiment 1. The heat sink 6b according to the second modification of embodiment 1 has a smaller cross-sectional area than the heat sink 6a according to the first modification of embodiment 1. That is, since the heat sink 6b is lighter than the heat sink 6a, the illumination lamp 1b can be reduced in weight.

A third modification of embodiment 1.

Fig. 11 is a sectional view of an illumination lamp according to a third modification of embodiment 1. The illumination lamp 1c according to the third modification of embodiment 1 is different from the illumination lamp 1 according to embodiment 1 in that, in the cover 2c according to the third modification of embodiment 1, the emission-side holding protrusion 22 of the cover 2c is formed at a position where the fixture-side flat surface 22b of the emission-side holding protrusion 22 abuts against the fixture-side support portion 64 when the light source module 3 is fixed inside the cover 2 c. The shape of the heat sink 6c according to the third modification of embodiment 1 is substantially the same as that of the heat sink 6 according to embodiment 1.

A distance Ha from the emission-side plane 22a of the emission-side holding protrusion 22 to a plane parallel to the emission-side plane 22a and passing through the central axis O in the third modification of embodiment 1 is longer than the distance H in embodiment 1.

The cover 2c of the third modification of embodiment 1 is formed such that the emission-side holding projection 22 is closer to the instrument side than the cover 2 of embodiment 1, and therefore the amount of projection of the emission-side holding projection 22 is reduced. Therefore, the cover 2c of the third modification of embodiment 1 can reduce the amount of the second cover material used to form the injection-side holding protrusion 22, as compared with the cover 2 of embodiment 1. Further, the emission-side holding projection 22 is formed closer to the fixture side, whereby the illumination lamp 1c can increase the irradiation angle of light.

A fourth modification of embodiment 1.

Fig. 12 is a sectional view of an illumination lamp according to a fourth modification of embodiment 1. The illumination lamp 1d according to the fourth modification of embodiment 1 is different from the illumination lamp 1c according to the third modification of embodiment 1 in that the emission-side support portion 63 is not formed in the heat sink 6d according to the fourth modification of embodiment 1. The shape of the cover 2d according to the fourth modification of embodiment 1 is substantially the same as that of the cover 2c according to the third modification of embodiment 1.

Since the emission-side support portion 63 is not formed in the heat sink 6d according to the fourth modification of embodiment 1, the area of the emission-side flat surface 22a of the emission-side holding projection 22 facing the emission-side space 25 is larger than that of the third modification of embodiment 1, and the effect of improving the light emission efficiency of the illumination lamp of the present invention can be more remarkably exhibited.

A fifth modification of embodiment 1.

Fig. 13 is a sectional view of an illumination lamp according to a fifth modification of embodiment 1. The illuminating lamp 1e according to the fifth modification of embodiment 1 is different from the illuminating lamp 1 according to embodiment 1 in that the heat sink 6e according to the fifth modification of embodiment 1 is downsized, the emission-side holding protrusion 22 of the cover 2e according to the fifth modification of embodiment 1 is formed at a position close to the appliance side, and the appliance-side holding protrusion 23 is not formed.

A distance Hb from the emission-side plane 22a of the emission-side holding protrusion 22 to a plane parallel to the emission-side plane 22a and passing through the central axis O in the fifth modification of embodiment 1 is longer than the distance H in embodiment 1.

Fig. 14 is a perspective view of a heat sink according to a fifth modification of embodiment 1, as viewed from one end portion (from the base point side of arrow X). Fig. 15 is a perspective view of a heat sink according to a fifth modification of embodiment 1, as viewed from the other end (the tip side of arrow X). The heat sink 6e according to the fifth modification of embodiment 1 is also formed such that the light source installation portion 61, the pair of side wall portions 62, the pair of emission side support portions 63, the pair of fixture side support portions 64, and the pair of screw fixing portions 65 are integrated so as to extend in the entire longitudinal direction (the direction of arrow X) of the heat sink 6e, similarly to the heat sink 6 according to embodiment 1.

The light source installation portion 61 is flat plate-shaped as in embodiment 1, and the substrate 5 is installed on the surface located on the emission side so that the light source 4 faces the emission side. A pair of side wall portions 62 are provided upright on the surface of the light source installation portion 61 on the emission side so as to face the emission side. Further, on both ends in the short direction (the direction of the arrow Y) of the light source installation portion 61, there are provided emission side support portions 63 protruding in parallel to the short direction, and when the light source module 3 is fixed inside the cover 2e, the emission side support portions 63 are formed at positions abutting against the fixture side flat surfaces 22b of the emission side holding protrusions 22.

Further, instrument side support portions 64 standing toward the instrument side are provided at both ends of the light source installation portion 61 in the short side direction, and the distal ends of the instrument side support portions 64 are formed in a shape along the inner circumferential surface of the cylindrical portion 21. A pair of screw fixing portions 65 are provided on the surface of the light source installation portion 61 on the appliance side so as to protrude toward the appliance side, and the tip ends of the screw fixing portions 65 are also formed in a shape along the inner circumferential surface of the cylindrical portion 21. A screw hole 66 is formed between the screw fixing portions 65. Further, a gap is formed between the emission-side support portion 63 and the appliance-side support portion 64 in the thickness direction (the direction of arrow Z) of the heat sink 6. Further, a gap is also formed between the appliance-side support portion 65 and the screw fixing portion 65 in the short-side direction (the direction of arrow Y) of the heat sink 6.

In the fifth modification of embodiment 1, the length dimension (the width dimension of the substrate 5) in the short side direction (the direction of the arrow Y) of the substrate 5 is 8.5[ mm ].

By reducing the size of the heat sink as in the fifth modification of embodiment 1, the light source 4 can be disposed closer to the appliance side than embodiment 1 from the central axis O of the cover 2, and the range in which light emitted from the light source 4 is irradiated outside the illumination lamp 1e is increased without being reflected by the cover. In a light source module in which a plurality of light sources 4 are arranged as in the light source module 3 of embodiment 1, a luminance difference occurs between a region where the light sources 4 are arranged and a region where the light sources 4 are not arranged at the time of lighting. This difference in brightness allows the user to recognize the light sources 4 arranged independently when the user visually confirms the appearance, and causes discomfort. However, as in the fifth modification of embodiment 1, by increasing the range of direct irradiation of the light emitted from the light source 4, it is possible to suppress a difference in luminance between the region where the light source 4 is disposed and the region where the light source 4 is not disposed, and to reduce the user's sense of discomfort.

A sixth modification of embodiment 1.

Fig. 16 is a sectional view of an illumination lamp according to a sixth modification of embodiment 1. The illumination lamp 1f according to the sixth modification of embodiment 1 is different from the illumination lamp 1e according to the fifth modification of embodiment 1 in that there is no gap between the emission-side support portion 63 and the fixture-side support portion 64 of the heat sink 6f according to the sixth modification of embodiment 1, and the support portion 67 functioning similarly to the emission-side support portion 63 and the fixture-side support portion 64 is formed. The shape of the cover 2f according to the sixth modification of embodiment 1 is substantially the same as that of the cover 2e according to the fifth modification of embodiment 1.

Since the radiator 6f of the sixth modification of embodiment 1 has the support portions 67 formed by eliminating the gaps between the injection-side support portions 63 and the appliance-side support portions 64, the shape is simpler than that of the radiator 6e of the fifth modification of embodiment 1, and improvement in formability can be expected. Since there is no gap between the emission-side support portion 63 and the appliance-side support portion 64, the cross-sectional area of the heat sink 6f according to the sixth modification of embodiment 1 is larger than that of the appliance-side support portion according to the fifth modification of embodiment 1. Therefore, the rigidity of the heat sink is improved and the heat capacity is increased, so that the illumination lamp 1f according to the sixth modification example of embodiment 1 is less likely to warp or bend, and the mounting quality (reliability) of the light source 4 is improved, for the same reason as in the first modification example of embodiment 1.

A seventh modification of embodiment 1.

Fig. 17 is a sectional view of an illumination lamp according to a seventh modification of embodiment 1. The illuminating lamp 1g according to the seventh modification of embodiment 1 is different from the illuminating lamp 1e according to the fifth modification of embodiment 1 in that the radiator 6g according to the seventh modification of embodiment 1 does not have a gap between the fixture-side support portion 64 and the screw fixing portion 65, and a portion corresponding to the screw fixing portion 65 is a part of the fixture-side support portion 64. The shape of the cover 2g according to the seventh modification of embodiment 1 is substantially the same as that of the cover 2e according to the fifth modification of embodiment 1.

The heat sink 6g of the seventh modification of embodiment 1 is simpler in shape and is expected to have improved formability than the heat sink 6e of the fifth modification of embodiment 1 because there is no gap between the fixture-side support portion 64 and the screw fixing portion 65. Further, since there is no gap between the emission-side support portion 64 and the appliance-side support portion 65, the cross-sectional area of the heat sink 6f of the sixth modification of embodiment 1 is larger than the cross-sectional area of the heat sink 6e of the fifth modification of embodiment 1. Therefore, the rigidity of the heat sink is improved and the heat capacity is increased, so that the illumination lamp 1g according to the seventh modification example of embodiment 1 is less likely to warp or bend, and the mounting quality (reliability) of the light source 4 is improved, for the same reason as in the first modification example of embodiment 1. Further, since the contact area between the radiator 6g of the seventh modification of embodiment 1 and the inner peripheral surface of the cover 2g is larger than the contact area between the radiator 6e of the fifth modification of embodiment 1 and the inner peripheral surface of the cover 2e, the heat conductivity of heat conducted from the radiator 6g to the cover 2g is improved, and the heat radiation performance of the illumination lamp 1g is improved.

An eighth modification of embodiment 1.

Fig. 18 is a sectional view of an illumination lamp according to an eighth modification of embodiment 1. The illumination lamp 1h according to the eighth modification of embodiment 1 is different from the illumination lamp 1e according to the fifth modification of embodiment 1 in that the radiator 6h according to the eighth modification of embodiment 1 does not have a gap between the emission-side support portion 63 and the fixture-side support portion 64 and a gap between the fixture-side support portion 64 and the screw fixing portion 65, and is formed with the support portion 67 that functions similarly to the emission-side support portion 63, the fixture-side support portion 64, and the screw fixing portion 65. The shape of the cover 2h according to the eighth modification of embodiment 1 is substantially the same as that of the cover 2e according to the fifth modification of embodiment 1.

Since the heat sink 6g of the eighth modification of embodiment 1 does not have a gap between the emission-side support portion 63 and the fixture-side support portion 64 and a gap between the fixture-side support portion 64 and the screw fixing portion 65, the same effects as those of the illumination lamp 1f of the sixth modification of embodiment 1 and the illumination lamp 1g of the seventh modification of embodiment 1 can be obtained.

A ninth modification of embodiment 1.

Fig. 19 is a sectional view of an illumination lamp according to a ninth modification of embodiment 1. The illumination lamp 1i according to the ninth modification of embodiment 1 is different from the illumination lamp 1e according to the fifth modification of embodiment 1 in that the fixture-side support portion 64 is not formed in the heat sink 6i according to the ninth modification of embodiment 1. The shape of the cover 2i according to the ninth modification of embodiment 1 is substantially the same as that of the cover 2e according to the fifth modification of embodiment 1.

Since the radiator 6i of the ninth modification of embodiment 1 does not have the fixture-side support 64, the radiator is light and the illumination lamp 1i can be reduced in weight.

Embodiment 2.

Fig. 20 is a perspective view of the illumination lamp according to embodiment 2. Fig. 21 is a sectional view of the illumination lamp according to embodiment 2 taken along the line B-B in fig. 20. Fig. 22 is a side view of the illumination lamp of embodiment 2. In fig. 20, a part of the cover 2j is omitted to explain the inside of the cover 2 j. In illumination lamp 1 of embodiment 1, the entire cylindrical portion 21 is formed of the first cover material, but in illumination lamp 1j of embodiment 2, a part of the cylindrical portion 21 of cover 2j is formed of the second cover material. In embodiment 2, the configurations other than the cover 2j are substantially the same as those in embodiment 1, and therefore, the description thereof is omitted.

The cylindrical portion 21 of the cover 2j according to embodiment 2 is formed in a cylindrical shape by integrating a pair of emission-side holding protrusions 22, an emission-side light transmission portion 21a located on the emission side of the emission-side holding protrusions 22, and an instrument-side light transmission portion 21b located on the instrument side of the emission-side holding protrusions 22. An end surface of the injection-side holding protrusion 22 exposed to the outer peripheral surface of the cylindrical portion 21 is an exposed-side end surface 22 d. The distal end surface 22c, which is the surface of the injection-side holding protrusion 22 opposite to the exposure-side end surface 22d, protrudes inward of the cylindrical portion 21. The pair of device-side holding protrusions 23 are integrated with the device-side light transmission section 21b and protrude from the inner circumferential surface of the device-side light transmission section 21 b. The emission-side holding projection 22 and the device-side holding projection 23 are located closer to the device than a central axis O parallel to the longitudinal direction (the direction of arrow X) of the cover 2 j. The emission-side holding projection 22 and the device-side holding projection 23 are formed so as to extend in the entire longitudinal direction of the cover 2j, and the shape of a cross section obtained by cutting the cover 2j perpendicularly to the longitudinal direction always has the cross-sectional shape shown in fig. 21 regardless of the position in the longitudinal direction.

The emission side light transmission portions 21a, the device side light transmission portions 21b, and the device side holding protrusion portions 23 are formed using the first cover material described in embodiment 1. The injection-side holding protrusion 22 is formed using the second cover material described in embodiment 1. Therefore, the exposed end surface 22d of the emission-side holding protrusion 22 on the outer periphery of the cylindrical portion 21 of the cover 2j of embodiment 2 is formed using the second cover material, and a surface made of the second cover material exists on the outer periphery of the illumination lamp 1. At least the light transmission portion 21a on the light exit side is made of a first cover material having light transmission properties, and corresponds to the light transmission portion of the present invention.

The cover 2j of embodiment 2 is manufactured by, for example, two-color molding, as in embodiment 1. In embodiment 2, the cover 2j is formed by extruding the first cover material in a molten state from an extruder for forming the injection-side light transmission portion 21a, the appliance-side light transmission portion 21b, and the appliance-side holding protrusion 23, extruding the second cover material in a molten state from an extruder for forming the injection-side holding protrusion 22, integrating them in 1 die, and then cooling and solidifying them.

When fixed inside the cover 2j, the light source module 3 is fixed at a position where the emission-side support 63 abuts the device-side flat surface 22b of the emission-side holding protrusion 22, the device-side support 64 is along the device-side translucent portion 21b, and the tip of the device-side support 64 engages with the device-side holding protrusion 23.

In illumination lamp 1j according to embodiment 2, emission-side light transmission portion 21a of cylindrical portion 21 has light transmissivity, and emission-side holding protrusion 22 is formed of a second cover material having a higher reflectance than the first cover material. Therefore, for the same reason as that of the illumination lamp 1 of embodiment 1, the illumination lamp 1j of embodiment 2 can efficiently use light emitted from the light source as illumination light for the illumination lamp 1j, and can make the illumination lamp 1j have higher luminous efficiency than a conventional illumination lamp.

In the illumination lamp 1j according to embodiment 2, the emission-side holding projection 22 is located closer to the appliance than the center axis O of the cover 2j, and the exposure-side end surface 22d of the emission-side holding projection 22 made of the second cover material and exposed to the outer periphery of the illumination lamp 1j is also located closer to the appliance than the center axis O of the cover 2 j. Further, since the second cover material has a higher reflectance than the first cover material and has a different appearance, the exposure-side end surface 22d of the emission-side holding protrusion 22 exposed to the outer periphery of the illumination lamp 1j serves as a mark for specifying the orientation of the illumination lamp 1j when the illumination lamp 1j is attached to the lighting fixture 101, and the user can easily attach the illumination lamp 1j to the lighting fixture 101 by using the mark.

Embodiment 3.

Fig. 23 is a perspective view of an illumination lamp according to embodiment 3. Fig. 24 is a cross-sectional view taken along line C-C in fig. 23 showing an illumination lamp according to embodiment 3. Fig. 25 is a side view of the illumination lamp of embodiment 3. In fig. 23, a part of the cover 2k is omitted for explaining the inside of the cover 2 k. Although the lamp 1j according to embodiment 2 is formed with the first cover material for the device-side translucent portion 21b, the lamp 1k according to embodiment 3 is formed with the second cover material for the device-side reflecting portion 27 corresponding to the device-side translucent portion 21 b. In embodiment 3, the configuration other than the cover 2k is substantially the same as that of embodiment 1, and therefore, the description thereof is omitted.

Cover 2k of embodiment 3 is formed in a substantially cylindrical shape by emission side light transmission portion 21a and device side reflection portion 27. In the 2 locations of the device-side reflecting portion 27 that contact the output-side light transmission portion 21a, the output-side holding protrusions 22 protrude from the inner peripheral surface of the device-side reflecting portion 27, and the pair of device-side holding protrusions 23 protrude from the inner peripheral surface of the device-side reflecting portion 27 from the locations that are located closer to the device side than the output-side holding protrusions 22. The emission-side holding projection 22 and the device-side holding projection 23 are formed so as to extend in the entire longitudinal direction (the direction of the arrow X) of the cover 2k, and the shape of a cross section obtained by cutting the cover 2k perpendicularly to the longitudinal direction always takes the shape shown in fig. 23 regardless of the position in the longitudinal direction.

The light transmission portion 21a on the emission side is formed using the first cover material described in embodiment 1. The device-side reflecting portion 27, the emission-side holding protrusion 22, and the device-side holding protrusion 23 are formed using the second cover material described in embodiment 1. Therefore, in illumination lamp 1k according to embodiment 3, the surface formed of the second cover material is exposed on the outer periphery of cover 2 k. At least the light transmission portion 21a on the light emission side is made of the first cover material having light transmission properties, and thus corresponds to the light transmission portion of the present invention.

The cover 2k of embodiment 3 is also manufactured by, for example, two-color molding in the same manner as embodiment 1. In embodiment 3, the first cover material is extruded in a molten state from an extruder for forming the emission-side light transmission portion 21a, the second cover material is extruded in a molten state from an extruder for forming the fixture-side reflection portion 27, the emission-side holding protrusion 22, and the fixture-side holding protrusion 23, and the cover 2k is formed by integrating them in 1 die and then cooling and solidifying them.

When the light source module 3 is fixed inside the cover 2k, the emission-side support 63 abuts on the fixture-side flat surface 22b of the emission-side holding protrusion 22, the fixture-side support 64 is positioned along the fixture-side reflection portion 27, and the distal end of the fixture-side support 64 engages with the fixture-side holding protrusion 23.

In illumination lamp 1k according to embodiment 3, emission-side light transmitting portion 21a has light transmissivity, and emission-side holding protrusion 22 is formed of a second cover material having higher reflectivity than the first cover material. Therefore, for the same reason as that of the illumination lamp 1 of embodiment 1, the illumination lamp 1k of embodiment 3 can efficiently use light emitted from the light source as illumination light for the illumination lamp 1k, and can make the illumination lamp 1k have higher luminous efficiency than conventional illumination lamps.

Further, since the appliance-side reflecting portion 27 of the illumination lamp 1k according to embodiment 3 is formed of the second cover material, the appearance of the exit-side translucent portion 21a is different from that of the appliance-side reflecting portion 27, the appliance-side reflecting portion 27 serves as a mark for specifying the orientation of the illumination lamp 1k when the illumination lamp 1k is attached to the illumination appliance 101, and the user can easily attach the illumination lamp 1k to the illumination appliance 101 by flexibly using the mark.

Further, since the second cover material forming the device side reflection portion 27, the emission side holding protrusion 22, and the device side holding protrusion 23 does not need to have light transmittance, other materials having improved physical properties may be mixed in addition to the material having improved reflectance. In particular, by mixing a material having improved thermal conductivity such as a thermally conductive filler, and improving the thermal conductivity of the fixture-side reflection portion 27, the thermal conductivity of heat conducted from the heat sink 6 to the cover 2k is improved, and the heat radiation performance of the illumination lamp is improved.

In the case where the second cover member does not have translucency, characters, figures, and the like for identifying a product can be displayed on the outer peripheral portion of the appliance-side reflection portion 27. When the instrument-side reflection portion 27 is formed of a second cover material having no light-transmitting property, the visibility of characters or graphics displayed on the outer peripheral portion is improved as compared with the case where the instrument-side reflection portion 27 has a light-transmitting property.

Embodiment 4.

Fig. 26 is a sectional view of the illumination lamp of embodiment 4. Fig. 27 is a side view of the illumination lamp of embodiment 4. Fig. 28 is a perspective view of the cover according to embodiment 4 as seen from one end portion (the side of the base point of arrow X). Fig. 29 is a perspective view of the cover according to embodiment 4 as seen from the other end (the tip side of arrow X). The emission-side plane 22a of the emission-side holding projection 22 of the illumination lamp 1 of embodiment 1 is substantially parallel to the fixture-side plane 22b, but the emission-side holding projection 22 of the illumination lamp 1l of embodiment 4 inclines the emission-side plane 22a with respect to the fixture-side plane 22b so that the thickness of the emission-side holding projection 22 increases as it approaches the inner peripheral surface of the cover 2 l. The configurations other than the injection-side holding projection 22 are substantially the same as those in embodiment 1, and therefore, the description thereof is omitted.

The injection-side plane 22a of the injection-side holding protrusion 22 according to embodiment 4 is inclined at an angle θ with respect to the fixture-side plane 22b such that the thickness of the injection-side holding protrusion 22 becomes thinner toward the distal end surface 22 c. A corner portion formed by the front end surface 22c of the emission-side holding projection 22 and the emission-side flat surface 22a is formed so as to be located closer to the device side than an emission-side surface of the light source 4 described later when the light source module 3 is fixed inside the cover 2. In embodiment 4, the angle θ is about 15 degrees. The emission-side holding projection 22 and the device-side holding projection 23 are formed so as to extend in the entire longitudinal direction (the direction of the arrow X) of the cover 2l, and the shape of a cross section obtained by cutting the cover 2l perpendicularly to the longitudinal direction always takes the shape shown in fig. 23 regardless of the position in the longitudinal direction.

The emission-side holding projection 22 of the illumination lamp 1l according to embodiment 4 is formed of the second cover material having a higher reflectance than the first cover material. Therefore, for the same reason as that of the illumination lamp 1 of embodiment 1, the illumination lamp 1l of embodiment 4 can efficiently use the light emitted from the light source as the irradiation light of the illumination lamp 1l, and can make the light emission efficiency of the illumination lamp 1l higher than that of the conventional illumination lamp.

Further, as shown in embodiment 1, the light emitted from the light source 4 spreads symmetrically to the irradiation angle α with respect to the axis perpendicular to the light emitting surface, and therefore, of the light emitted from the illumination lamp 1, the light irradiated from outside the range of the irradiation angle α of the light source 4 is reflected light reflected by the substrate 5, the heat sink 6, the cylindrical portion 21, or the emission-side holding protrusion 22, and further, since the reflectance of a normal object is necessarily less than 1, the light beam thereof decreases each time it is reflected, and further, the farther from the range of the irradiation angle α, the greater the proportion of light which is reflected in the irradiation light is, and therefore, in the section β from the range of the irradiation angle α to the emission-side plane 22a of the emission-side holding protrusion 22, the closer to the emission-side holding protrusion 22, the greater the amount of the light beam irradiated is, and the difference from the light beam irradiated from the range of the irradiation angle α is greater, and in this case, if the difference between the light beam of any portion within the section β and the light beam irradiated from the range of the irradiation angle α is perceived as a constant or greater, the light beam is present in the illumination lamp 1, and thus, the light is perceived by the light which is not present in the illumination lamp 1, and thus, the light is not perceived by the light which is present in the light which is not perceived by the light which is present in.

However, since the emission-side holding projection 22 of the illumination lamp 1l according to embodiment 4 is formed so that the thickness of the emission-side holding projection 22 becomes thinner as it goes toward the distal end surface 22c, the section β can be narrowed, and the portion where the user feels faint can be eliminated, and the user can be prevented from feeling that there is unevenness in brightness, compared to the case where the thickness of the emission-side holding projection 22 is uniform as in the illumination lamp 1 according to embodiment 1.

In the illumination lamp 1l according to embodiment 4, the area of the emission-side holding protrusion 22 in contact with the inner circumferential surface of the cylindrical portion 21 is larger than that of the illumination lamp 1 according to embodiment 1, and therefore the strength of the holding protrusion 22 is increased.

In embodiment 4, the angle θ is set to about 15 degrees, but the user feels that a portion that is slightly dark is determined by the shape of the surface of the light source module 3 facing the emission-side space 25 or the user's feeling, and therefore the angle θ is not limited to 15 degrees and may be any angle, however, as described above, the area that the user feels slightly dark is formed only outside the range of the irradiation angle α of the light source 4, and if the emission-side holding protrusion 22 enters the range of the irradiation angle α of the light source 4, the irradiation angle of the illumination lamp 1l is smaller than the irradiation angle of the light source 4, and therefore the angle θ is preferably set so as not to be set as to the angle at which the emission-side holding protrusion 22 enters the range of the irradiation angle α, and specifically, the angle θ is preferably set to 90- (α/2) degrees or less, and for example, when the irradiation angle α is 120 degrees, the angle is preferably set to 30 degrees or less.

Fig. 30 is a sectional view of an illumination lamp according to a first modification of embodiment 4. As in the illumination lamp 1m according to the first modification of embodiment 4, the emission-side holding protrusion 22 of the cover 2l according to embodiment 4 may be formed at a position close to the appliance side, and the cover 2m without the appliance-side holding protrusion 23 and the heat sink 6m having the same shape as the heat sink 6e according to the fifth modification of embodiment 1 may be used. In the second modification of embodiment 4, the configurations other than the

covers

2m and 6m are substantially the same as those of embodiment 1, and therefore, the description thereof is omitted.

Fig. 31 is a sectional view of an illumination lamp according to a second modification of embodiment 4. Fig. 32 is a perspective view of the cover according to the second modification of embodiment 4, as seen from one end portion (the base point side of arrow X). Fig. 33 is a perspective view of the cover according to the second modification of embodiment 4, as seen from the other end (the tip side of arrow X). As in the illumination lamp 1n according to the second modification of embodiment 4, the second emission-side holding protrusion 28 may be provided so as to stand from the inner circumferential surface of the cylindrical portion 21. The heat sink 6n according to the second modification of embodiment 4 has the same shape as the heat sink 6e according to the fifth modification of embodiment 1, and the configuration other than the cover 2n is the same as that of the first modification of embodiment 4, and therefore, the description thereof is omitted.

The second injection-side holding protrusion 28 protrudes from the inner circumferential surface of the cylindrical portion 21 at a position closer to the device than the injection-side holding protrusion 22. The surface of the second emission-side holding projection 28 on the emission side is substantially parallel to the instrument-side plane. The second injection-side holding protrusion 28 is formed of the first cover material.

When the heat sink 6n is fixed inside the cover 2n, the second emission-side holding projection 28 is positioned in the gap between the emission-side support portion 63 and the fixture-side support portion 64, the emission-side surface of the second emission-side holding projection 28 abuts against the emission-side support portion 63, and the fixture-side flat surface abuts against the fixture-side support portion 64. Therefore, the engagement between the cover and the heat sink becomes stronger.

Embodiment 5.

Fig. 34 is a sectional view of the illumination lamp of embodiment 5. Although cover 2 of illumination lamp 1 of embodiment 1 is cylindrical and heat sink 6 is housed inside cover 2, illumination lamp 1o of embodiment 5 has an opening formed on the fixture side of cover 2o, and a part of heat sink 6o is exposed to the outside of cover 2 o. The configurations other than the cover 2o and the heat sink 6o are substantially the same as those of embodiment 1, and therefore, the description thereof is omitted.

The cover 2o includes an arc portion 29 having an opening formed on the appliance side and having an arc shape on the emission side of the light source module 3, a pair of emission-side holding projections 22 projecting from the inner peripheral surface of the arc portion 29, and a pair of second emission-side holding projections 28 extending from both ends of the arc portion 29 in parallel with the emission-side holding projections 22. The arcuate portion 29, the pair of emission-side holding projections 22, and the pair of second emission-side holding projections 28 are integrated and formed to extend in the entire longitudinal direction (the direction of arrow X) of the cover 2 o.

The arcuate portion 29 and the second emission-side holding projection 28 are formed of the first cover material described in embodiment 1. The injection-side holding protrusion 22 is formed of the second cover material described in embodiment 1. The cover 2o of embodiment 5 is also manufactured by, for example, two-color molding in the same manner as embodiment 1, in which a first cover material is extruded in a molten state from an extruder in which the circular arc portion 29 and the second injection-side holding protrusion portion 28 are formed, a second cover material is extruded in a molten state from an extruder in which the injection-side holding protrusion portion 22 is formed, and the cover 2o is formed by integrating the cover materials in 1 die and then cooling and solidifying the cover materials. At least the arc portion 29 is made of a first cover material having light transmittance, and thus corresponds to the light transmittance portion of the present invention.

The heat sink 6o has substantially the same shape as the heat sink 6 of embodiment 1, except for the appliance-side support portion 64. The device side support portion 64 has an arc shape, and a gap is formed between the device side support portion and each of the pair of emission side support portions 63. The light source installation portion 61, the pair of side wall portions 62, the pair of emission side support portions 63, the fixture side support portion 64, and the pair of screw fixing portions 65 are integrated and formed to extend in the entire longitudinal direction (the direction of arrow X) of the heat sink 6.

When the light source module 3 is fixed inside the cover 2o, the fixture-side support portion 64 of the heat sink 6o is fixed so as to cover the fixture-side opening of the cover 2o and is exposed to the outer periphery of the illumination lamp 1 o. The device-side flat surface 22b of the emission-side holding projection 22 of the cover 2o abuts against the emission-side support 63. The second emission-side holding projection 28 is located in the gap between the emission-side support portion 63 and the fixture-side support portion 64, the emission-side surface of the second emission-side holding projection 28 abuts against the emission-side support portion 63, and the fixture-side flat surface abuts against the fixture-side support portion 64.

The emission-side holding projection 22 of the illumination lamp 1o according to embodiment 5 is formed of a second cover material having a higher reflectance than the first cover material. Therefore, for the same reason as that of the illumination lamp 1 of embodiment 1, the illumination lamp 1o of embodiment 5 can efficiently use the light emitted from the light source as the irradiation light of the illumination lamp 1o, and can make the light emission efficiency of the illumination lamp 1o higher than that of the conventional illumination lamp.

In addition, in illumination lamp 1o according to embodiment 5, since heat sink 6o is exposed to the outer periphery of illumination lamp 1o, heat can be directly radiated from heat sink 6o to the outside of illumination lamp 1o, and thus the heat radiation performance of the illumination lamp is improved.

Embodiment 6.

Fig. 35 is a sectional view of the illumination lamp of embodiment 6. The emission-side holding projection 22 of the cover 2 of the illumination lamp 1 of embodiment 1 is formed of the second cover material, while the emission-side holding projection 22 of the cover 2p of the illumination lamp 1p of embodiment 6 is formed of the first cover material, and the highly reflective layer 22e is formed on the emission-side flat surface 22a and the distal end surface 22c of the emission-side holding projection 22. The configurations other than the injection-side holding projection 22 are substantially the same as those in embodiment 1, and therefore, the description thereof is omitted.

The highly reflective layer 22e is formed of a substance having a higher reflectance than the first cover material. As a method for forming the highly reflective layer 22e, for example, a method of laying a highly reflective member formed into a sheet shape, a method of applying a molten resin having a high reflectance and drying and curing the same, or the like can be used.

A highly reflective layer 22e having a higher reflectance than the first cover material is formed on the emission-side flat surface 22a of the emission-side holding protrusion 22 of the illumination lamp 1p according to embodiment 6. Therefore, for the same reason as that of the illumination lamp 1 of embodiment 1, the illumination lamp 1p of embodiment 6 can efficiently use the light emitted from the light source as the irradiation light of the illumination lamp 1p, and the light emission efficiency of the illumination lamp 1p can be further improved as compared with the conventional illumination lamp.

The injection-side holding protrusion 22 according to embodiment 6 is made of a first cover material. Therefore, the cover 2p can be formed only by forming the highly reflective layer 22e on the emission-side flat surface 22a and the distal end surface 22c of the emission-side holding protrusion 22 of the conventional cover, and thus can be manufactured by a conventional cover manufacturing apparatus.

In the above-described embodiment and modification, the straight tube lamp with the base shaped in JE L801 was described, but the present embodiment can be applied to a straight tube lamp with a base shaped in JE L802 or another straight tube L ED, for example.

Although the embodiment and the modification have been described above, 2 or more of the above embodiments and modifications may be combined and implemented. Alternatively, 1 of the above embodiments and modifications may be locally implemented. Alternatively, 2 or more of the above embodiments and modifications may be partially combined and implemented. The present invention is not limited to the above-described embodiments and modifications, and various modifications may be made as necessary.

Description of the symbols

1 illumination lamp, 1a to 1p illumination lamps, 2 covers, 2a to 2p covers, 3 light source modules, 4 light sources, 5 substrates, 6 heat sinks, 6a to 6p heat sinks, 7 holding bases, 8 power supply bases, 9 screws, 21 cylindrical portions, 21a emission side light transmission portions, 21b fixture side light transmission portions, 22 emission side holding protrusions, 22a emission side flat surfaces, 22b fixture side flat surfaces, 22c front end surfaces, 22d exposed side end surfaces, 22e highly reflective layers, 23 fixture side holding protrusions, 24 cover inner spaces, 25 emission side spaces, 26 fixture side spaces, 27 fixture side reflective portions, 28 second emission side holding protrusions, 29 arc portions, 61 light source setting portions, 62 side wall portions, 63 emission side support portions, 64 fixture side support portions, 65 screw fixing portions, 66 screw holes, 67 support portions, 71 holding base frames, 72 holding terminals, 73 screw holes, 81 power supply base frame, 82 power supply terminal, 83 screw hole, 100 lighting device, 101 lighting apparatus, 102 apparatus body, 103 holding socket, 104 power supply socket, 105 power supply box

Claims

1. An illumination lamp is characterized by comprising:

a light source module including a light source, a substrate having a long flat plate shape on which the light source is mounted, and a heat sink for dissipating heat generated from the light source to the outside of an illumination lamp;

a cover having an elongated light-transmitting portion that covers a surface on an emission side of the light source module from which the light of the light source is emitted, the cover being formed of a first cover material that is a resin having light-transmitting properties, a first holding protrusion that protrudes inward of the light-transmitting portion and is formed of a second cover material that is a highly reflective resin having a higher reflectivity than the first cover material and that is a material that enhances reflectivity, a surface of the first holding protrusion opposite to the surface on the emission side being in contact with the heat sink, and a second holding protrusion that protrudes from an inner peripheral surface of the light-transmitting portion at a position opposite to the emission side than the first holding protrusion and whose surface on the emission side being in contact with the heat sink and being fixed to the first holding protrusion with the heat sink therebetween,

the surface on the ejection side of the first holding projection is inclined in a direction in which the thickness of the first holding projection becomes thinner toward the tip with respect to the surface on the opposite side of the first holding projection,

the surface on the emission side of the first holding projection is inclined at an angle theta with respect to the surface on the opposite side of the first holding projection,

the angle theta relative to the light distribution angle α of the light source satisfies the condition that theta is less than or equal to 90- (α/2).

2. The lighting lamp according to claim 1,

the cover is integrally formed by two-color molding using the first cover material and the second cover material.

3. The illumination lamp according to claim 1 or 2,

the outer peripheral surface of the cover is entirely formed of the first cover material.

4. The illumination lamp according to claim 1 or 2,

the first holding projection is located at a position offset to the opposite side of the emission side from the center axis of the cover,

a part of the first holding projection is exposed to an outer peripheral surface of the cover.

5. A cover for an illumination lamp, comprising:

a light-transmitting portion that covers a surface of a light source module on a light emission side from which light from the light source is emitted, the light-transmitting portion being formed of a first cover material that is a light-transmitting resin, the light source module including a light source, a substrate that is long and flat and on which the light source is mounted, and a heat sink that dissipates heat generated from the light source to the outside of the illumination lamp;

a first holding protrusion protruding toward the inside of the light transmission portion and formed of a second cover material that is a highly reflective resin having a higher reflectance than the first cover material and mixed with a material that improves the reflectance, wherein a surface of the first holding protrusion opposite to the surface on the emission side is in contact with the heat sink; and

a second holding protrusion protruding from an inner peripheral surface of the light transmitting portion at a position opposite to the first holding protrusion on the emission side, and having an emission side surface abutting against the heat sink and fixed to the first holding protrusion with the heat sink interposed therebetween,

6. An illumination device is characterized by comprising:

a cover for a floodlight according to claim 5; and

a power supply device that supplies power to the light source.