JP2004182071A - Lighting equipment for illumination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize lighting equipment while extending the service life of a light source in the lighting equipment for illumination constituted so as to reflect the light from the light source toward the front of the lighting equipment with a reflector. <P>SOLUTION: Three semiconductor light emitting elements 12 are radially disposed toward a light axis Ax at equal intervals in the peripheral direction around the light axis Ax extending to the fore-and-aft direction of the lighting equipment. A reflecting surface of the reflector 14 consists of three small reflecting surfaces 14a respectively formed at the position opposing to the respective semiconductor light emitting elements 12 with respect to the light axis Ax. In this case, respective semiconductor light emitting elements 12 are disposed in the reflecting surface area of the reflector 14. The light from the respective semiconductor light emitting elements 12 is reflected toward the front of the lighting equipment by the respective small reflecting surfaces 14a opposing to the light emitting elements. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an illumination lamp configured to reflect light from a light source toward the front of the lamp by a reflector.
[0002]
[Prior art]
In the cabin of the aircraft, a reading light is provided at a position above each seat, and the reading light is configured to emit light from a light source to the front of the lamp by a reflector, as described in, for example, "Patent Document 1". It is configured to reflect light toward.
[0003]
On the other hand, Patent Literature 2 discloses a vehicle lamp using a light emitting diode as a light source. In this lamp, a plurality of light emitting diodes are arranged back to back with respect to the optical axis, and a small reflecting surface is arranged on the outer peripheral side of each light emitting diode.
[0004]
[Patent Document 1]
US Patent No. 5,222,801 Patent Specification [Patent Document 2]
JP 2001-332104 A [Problems to be Solved by the Invention]
The light source of the aircraft reading light described in Patent Document 1 is constituted by a halogen bulb, but the life of the halogen bulb is shorter than the service life of the body, so the bulb is frequently replaced. There is a need.
[0005]
In recent years, light emitting diodes of high luminous intensity have been developed. If a plurality of light emitting diodes are used as a light source as described in Patent Document 2, a required light flux can be secured and the light source can be used. It is possible to extend the life.
[0006]
However, in the vehicle lamp described in Patent Literature 2, since a plurality of small reflecting surfaces are arranged on the outer peripheral side of a plurality of light emitting diodes arranged back to back with respect to the optical axis, the outside of the reflector is provided. The diameter becomes large, so that the lamp cannot be made compact. Therefore, there is a problem that it is difficult to apply such a lamp configuration to an aircraft reading lamp in which the space for disposing the lamp is extremely limited.
[0007]
Such a problem is a problem that can similarly occur in lighting fixtures other than the aircraft reading lamp when the space for disposing the lighting fixture is limited.
[0008]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an illumination lamp capable of achieving a longer life of a light source and further reducing the size of the lamp. is there.
[0009]
[Means for Solving the Problems]
The present invention is intended to achieve the above object by devising the configuration of the light source and the reflector.
[0010]
That is, the lighting fixture according to the present invention is:
In a lighting fixture comprising a light source and a reflector for reflecting light from the light source toward the front of the lamp,
The light source comprises a plurality of semiconductor light-emitting elements arranged substantially radially toward the optical axis around an optical axis extending in the lamp front-rear direction,
The reflecting surface of the reflector comprises a plurality of small reflecting surfaces each formed at a position facing each of the semiconductor light emitting elements with respect to the optical axis,
Each of the semiconductor light emitting elements is arranged in a reflection surface area of the reflector.
[0011]
The "lighting lamp" is not limited to a specific type of lamp as long as the lamp is used for lighting, for example, an aircraft reading light, a vehicle reading light, a vehicle headlight, a store spotlight. Lamps and the like correspond to this.
[0012]
Each of the above “semiconductor light emitting elements” is not necessarily required to be arranged in a direction orthogonal to the optical axis as long as it is arranged substantially radially around the optical axis toward the optical axis. It may be arranged in a direction slightly inclined with respect to the direction orthogonal to the direction. The type of each of the “semiconductor light emitting elements” is not particularly limited, and for example, a light emitting diode, a laser diode, or the like can be adopted.
[0013]
The specific configuration such as the outer shape and the surface shape is not particularly limited as long as the “small reflective surface” is formed at a position facing each semiconductor light emitting element with respect to the optical axis.
[0014]
The phrase “disposed in the reflection surface area of the reflector” means that it is disposed on the inner peripheral side of the outer peripheral position of the reflective surface of the reflector when viewed from the front of the lamp.
[0015]
Effects of the Invention
As shown in the above configuration, in the lighting fixture according to the present invention, the light source is composed of a plurality of semiconductor light emitting elements, so that the life of the light source is extended as compared with the case where a halogen bulb or the like is used. Thus, a required light flux can be secured. At this time, the plurality of semiconductor light-emitting elements are arranged substantially radially around the optical axis extending in the front-rear direction of the lamp toward the optical axis, and the reflecting surface of the reflector is arranged with respect to the optical axis. And a plurality of small reflecting surfaces each formed at a position facing each other. Further, since each semiconductor light emitting element is arranged in the reflecting surface region of the reflector, the outer diameter of the reflector is suppressed to a small value. Thus, light from each semiconductor light emitting element can be reflected toward the front of the lamp by each of the small reflecting surfaces facing the light emitting element.
[0016]
As described above, according to the present invention, in a lighting fixture configured to reflect light from a light source toward the front of the lamp by a reflector, the life of the light source is extended and the lamp is downsized. be able to. Thus, the lighting fixture can be made suitable for use as a reading light for an aircraft or the like.
[0017]
In the above configuration, a plurality of sets of the semiconductor light emitting element and the small reflection surface are provided. At this time, if an odd number of these are provided at substantially equal intervals in the circumferential direction with respect to the optical axis, each semiconductor light emitting element is provided with a small reflection. Since it can be arranged at the boundary position between the surface and the small reflecting surface, each small reflecting surface can be used effectively. Thus, it is possible to increase the efficiency of the lamp by efficiently using the space for disposing the reflector.
[0018]
As described above, the specific configuration of each of the “small reflective surfaces” is not particularly limited. However, each of these small reflective surfaces is focused on the position of each semiconductor light emitting element facing the small reflective surface and the optical axis If it is constituted by a paraboloid of revolution having an axis substantially parallel to the central axis, parallel light can be emitted toward the front of the lamp, so that the illumination lamp can be suitable for spot illumination. Thus, the lighting fixture can be made more suitable for applications such as aircraft reading lamps.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a side sectional view showing a lighting fixture 10 according to an embodiment of the present invention in a state where the lighting lamp 10 is arranged downward. FIG. 2 is a detailed view of a main part of FIG. 1, and FIG. 3 is a view taken along line III-III of FIG. FIG. 4 is an exploded perspective view showing components of the illumination lamp 10.
[0021]
As shown in these drawings, an illumination lamp 10 according to the present embodiment is an aircraft reading light provided at a position above each seat in a cabin of an aircraft, and has a support ring attached to an interior ceiling panel 2 of the fuselage. It is adapted to be mounted to be tiltable via 50.
[0022]
The lighting lamp 10 includes three semiconductor light emitting elements 12 as light sources, and a reflector that reflects light from these semiconductor light emitting elements 12 toward the front of the lamp (however, downward when mounted on the interior ceiling panel 2). 14 and a housing 16 and a hood 18 for accommodating them.
[0023]
The three semiconductor light-emitting elements 12 are all white light-emitting diodes, and are arranged radially around the optical axis Ax extending in the front-rear direction of the lamp toward the optical axis Ax. At this time, these three semiconductor light emitting elements 12 are arranged at equal intervals in the circumferential direction with respect to the optical axis Ax.
[0024]
Each semiconductor light emitting element 12 is mounted on a substrate 22 via a heat sink 20 made of aluminum. The heat radiating plates 20 and the substrate 22 are radially arranged so as to extend in the front-rear direction of the lamp, and are fixed to a common support plate 24 at a rear end thereof by a plurality of screws 26. The support plate 24 is made of aluminum, and has a screw insertion hole 24a formed in the center thereof.
[0025]
The reflecting surface of the reflector 14 is composed of three small reflecting surfaces 14a formed at positions facing the respective semiconductor light emitting elements 12 with respect to the optical axis Ax. Each of these small reflecting surfaces 14a is constituted by a paraboloid of revolution having the position of the semiconductor light emitting element 12 facing the small reflecting surface 14a as the focal point F and the axis parallel to the optical axis Ax as the central axis Ax1. The focal lengths of the paraboloids of revolution forming these small reflecting surfaces 14a are set to the same value.
[0026]
In the reflector 14, a boss portion 14c is formed at the position of the optical axis Ax on the back side of the reflection surface forming portion 14b that forms the three small reflection surfaces 14a, and the three substrates 22 are disposed around the boss portion 14c on the outer side. A surrounding wall portion 14d is formed. An opening 14e is formed at a boundary position between the respective small reflecting surfaces 14a in the reflecting surface forming portion 14b, so that each semiconductor light emitting element 12 is located at the focal point F in front of the reflecting surface 14a. It is designed to be exposed to space.
[0027]
The reflector 14 is in contact with the support plate 24 at the rear end surfaces of the boss 14c and the peripheral wall 14d. A fixing cap 30 is screwed and fixed to the boss 14 c of the reflector 14 via a support plate 24 and a radiating fin 28.
[0028]
The radiation fins 28 are made of aluminum, and have a plurality of fin-like protrusions 28a formed substantially radially on the back surface of a substantially disk-shaped member. A screw insertion hole 28b is formed at the center of the radiating fin 28, and an annular step 28c is formed at the outer peripheral edge thereof.
[0029]
The fixing cap 30 includes a substantially disk-shaped frame member 30A and a screw member 30B embedded and fixed at the center position of the inner surface of the frame member 30A. A plurality of L-shaped ribs are provided on the inner surface side of the frame member 30A. 30a are formed radially. Thus, the fixing cap 30 secures a plurality of heat-dissipating gaps on the outer peripheral portion of the frame member 30A even when the screw member 30B is screwed and fixed to the boss portion 14c.
[0030]
A transparent light-transmitting plate 32 is provided in front of the reflector 14. The light transmitting plate 32 is formed in a flat cup shape, and is sandwiched between the housing 16 and the hood 18 at the outer peripheral edge thereof.
[0031]
The housing 16 is a substantially spherical shell-like member having circular openings formed at both front and rear ends, and a portion around the rear end opening is sandwiched between the annular step portion 28 c of the heat radiation fin 28 and the fixing cap 30. ing.
[0032]
The hood 18 is a substantially cylindrical member having a folded flange formed at a front end thereof, and is screwed and fixed to the housing 16 so as to be inserted into a front end opening of the housing 16 from the front side.
[0033]
The support ring 50 is a substantially spherical band-shaped member, the inner peripheral surface of which is formed of a spherical surface having substantially the same diameter as the outer peripheral surface of the housing 16, and the outer peripheral surface of which is engaged with the interior ceiling panel 2. An engagement portion 50a is formed.
[0034]
As described in detail above, the illumination lamp 10 according to the present embodiment has a longer light source life than the case where a halogen bulb or the like is used because the light source is composed of three semiconductor light emitting elements 12. Then, it is possible to secure a required light flux. At this time, these three semiconductor light emitting elements 12 are arranged radially around the optical axis Ax extending in the front-rear direction of the lamp toward the optical axis Ax, and the reflecting surface of the reflector 14 is positioned with respect to the optical axis Ax. It is composed of three small reflecting surfaces 14a formed at positions opposed to the respective semiconductor light emitting elements 12, and since each semiconductor light emitting element 12 is disposed in the reflecting surface area of the reflector 14, After the diameter is suppressed to a small value, light from each semiconductor light emitting element 12 can be reflected toward the front of the lamp by each small reflecting surface 14a facing the light emitting element.
[0035]
As described above, according to the present embodiment, it is possible to extend the life of the light source and to reduce the size of the lighting lamp 10, thereby making the lighting lamp 10 suitable for use as an aircraft reading light. It can be.
[0036]
Moreover, in the present embodiment, since the three sets of the semiconductor light emitting elements 12 and the small reflecting surfaces 14a are provided at equal intervals in the circumferential direction with respect to the optical axis Ax, each semiconductor light emitting element 12 and the small reflecting surface 14a are It can be arranged at the boundary position with the small reflection surface 14a, and thereby each small reflection surface 14a can be used effectively. As a result, the space for the reflector 14 can be used without waste and the lamp efficiency can be increased. In the present embodiment, each semiconductor light emitting element 12 is formed of a light emitting diode. However, since the light emitting diode has a high luminous intensity in the front direction and a highly directional light distribution, as in the present embodiment. It is particularly effective that the central area of each small reflecting surface 14a can be used without waste.
[0037]
In the present embodiment, each of the small reflecting surfaces 14a has a focus F at a position of each semiconductor light emitting element 12 facing the small reflecting surface 14a and a central axis Ax1 with an axis parallel to the optical axis Ax. Since it is constituted by a surface, it is possible to irradiate parallel light toward the front of the lamp, thereby making the illumination lamp 10 suitable for spot illumination. Therefore, the illumination lamp 10 can be made more suitable for use as an aircraft reading lamp.
[0038]
The illumination lamp 10 according to the present embodiment is mounted downward with respect to the interior ceiling panel 2. However, since the radiation fins 28 are provided at the rear end of the reflector 14, the height of the semiconductor light emitting element 12 is high. Even in the case of using light emitting diodes of luminous intensity, the heat generated from each of these light emitting diodes can be efficiently radiated to the external space via the radiation fins 28.
[0039]
By the way, in the above-described embodiment, the paraboloid of revolution constituting each small reflecting surface 14a has been described as being set to the same focal length. However, these may be set to different values. Further, each of the small reflecting surfaces 14a may be formed of a curved surface or a plane other than the paraboloid of revolution such as an elliptical surface or a hyperboloid.
[0040]
Further, in the above embodiment, the light transmitting plate 32 is described as being formed in a transparent manner, but a lens element or the like having a diffusion or deflection function may be formed on the light transmitting plate 32 as appropriate.
[0041]
In the above embodiment, the semiconductor light emitting element 12 and the small reflection surface 14a are described as being provided in three sets. However, an odd number (for example, 5 or 7) of these sets is provided. In this case, substantially the same operation and effect as the above embodiment can be obtained.
[Brief description of the drawings]
1 is a side sectional view showing an illumination lamp according to an embodiment of the present invention; FIG. 2 is a detailed view of a main part of FIG. 1; FIG. 3 is a view taken along line III-III of FIG. 2; Exploded perspective view showing components of a lighting fixture [Explanation of reference numerals]
2 Interior ceiling panel 10 Lighting fixture 12 Semiconductor light emitting element 14 Reflector 14a Small reflecting surface 14b Reflecting surface forming portion 14c Boss portion 14d Peripheral wall portion 14e Opening 16 Housing 18 Hood 20 Heat radiating plate 22 Substrate 24 Support plate 24a Screw insertion hole 26 Screw 28 Radiation fin 28a Projection 28b Screw insertion hole 28c Annular step 30 Fixing cap 30A Frame member 30B Screw member 30a L-shaped rib 32 Light transmission plate 50 Support ring 50a Engagement part Ax Optical axis Ax1 Central axis F Focus

Claims (3)

In a lighting fixture comprising a light source and a reflector for reflecting light from the light source toward the front of the lamp,
The light source comprises a plurality of semiconductor light-emitting elements arranged substantially radially around the optical axis extending in the lamp front-rear direction toward the optical axis,
The reflecting surface of the reflector comprises a plurality of small reflecting surfaces each formed at a position facing each of the semiconductor light emitting elements with respect to the optical axis,
An illumination lamp, wherein each of the semiconductor light emitting elements is arranged in a reflection surface area of the reflector. 2. The lighting fixture according to claim 1, wherein an odd number of the semiconductor light emitting elements and the small reflecting surfaces are provided at substantially equal intervals in a circumferential direction with respect to the optical axis. Each of the small reflecting surfaces is configured by a paraboloid of revolution having a focal point at the position of each of the semiconductor light emitting elements facing the small reflecting surface and having a central axis about an axis substantially parallel to the optical axis. The lighting fixture according to claim 1 or 2, wherein

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