JP2019192365A - Semiconductor light emitting bulb and lighting device using the same - Google Patents

Abstract

To provide a semiconductor light emitting bulb having a light distribution characteristic where a low light intensity range is dissolved, and to provide a lighting device.SOLUTION: A paraboloid reflector 2 and a lens 3 are provided on which an LED bulb 1' is mounted. The LED bulb 1' comprises: a base 11; an LED element 12 for high beam; an LED element 13 for low beam; a holding member 14; a heat sink 16 comprising fins 16-1, 16-2, ..., 16-5; and a wiring board 17'. On the LED element 12 for high beam and the LED element 13 for low beam, a reflection member 20 having a convex reflection surface 20a is provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a semiconductor light-emitting bulb made of a semiconductor light-emitting element such as a light-emitting diode (LED) element, and a lighting device using the same, and more particularly to improvement of the light distribution characteristics thereof.

  2. Description of the Related Art Conventionally, halogen bulbs and HID (High Intensity Discharge) bulbs are frequently used in automobiles, motorcycle headlamps, fog lamps, and the like.

  10A and 10B show a first conventional reflector-type illumination device, in which FIG. 10A is an overall cross-sectional view, and FIG. 10B is a cross-sectional view of the halogen bulb of FIG. In addition, the reflector type illuminating device of FIG. 10 is an example of a vehicle headlamp device.

  In FIG. 10A, a paraboloid reflector 102 and a lens 103 to which the halogen bulb 101 is attached are provided. In this case, the base 1011 of the halogen bulb 101 is fitted into the socket 102 a of the reflector 102.

  As shown in FIG. 10B, the halogen bulb 101 includes a high beam (running light distribution pattern) filament 1013 made of, for example, tungsten (W) and the like and provided in a glass tube 1012 into which a small amount of halogen gas has been introduced. A filament 1014 for (passing light distribution pattern) is provided, and a shade 1016 for cut-off line is provided below the low beam filament 1014.

  As shown in FIG. 10A, the high beam filament 1013 is positioned in the vicinity of the focal point of the reflector 102. Therefore, the emitted light L1 from the high beam filament 1013 is reflected by the reflector 102 to become parallel light, and far away. Irradiate. On the other hand, the low beam filament 1014 is positioned slightly above the front of the focal point of the reflector 102, and the emitted light L2 from the low beam filament 1014 is mainly reflected on the upper side of the reflector 102 and illuminates the lower front side.

  FIG. 11 is a diagram showing the directivity of light emitted from the low beam filament 1014 of FIG. 10, and shows the directivity in a cross section perpendicular to the axis of the filament 1014.

  As shown in FIG. 11, the emitted light L2 of the low beam filament 1014 is irradiated on the front and slightly left side by realizing a cut-off line (horizontal line) and a left upward line by the shade 1016. In this case, since the low beam filament 1014 acts as a point light source, the emitted light L2 is uniform within the irradiation range R of the reflector 102 defined by the shade 1016. Since the high beam filament 1013 also acts as a point light source, the emitted light L1 is not shown, but is uniform within the irradiation range of the reflector 102.

  In recent years, LED bulbs using energy-saving and long-life light-emitting diode (LED) elements have attracted attention. In this case, an LED bulb has been developed that ensures compatibility with the halogen bulb 101 of the reflector type lighting device of FIG.

  12A and 12B show a second conventional reflector-type illumination device, in which FIG. 12A is an overall cross-sectional view, and FIG. 12B is a perspective view of the LED bulb of FIG. In addition, the reflector type illuminating device of FIG. 12 is also a vehicle headlamp device.

  In FIG. 12A, a paraboloid reflector 2 and a lens 3 on which the LED bulb 1 is mounted are provided. In this case, the base 11 of the LED bulb 1 is fitted into the socket 2 a of the reflector 2.

As shown in FIG. 12B, in addition to the base 11, the LED bulb 1 includes a high beam LED element 12, a low beam LED element 13, a holding member 14, a shade 15, fins 16-1, 16-2,. It consists of a heat sink 16 made of 16-5 and a wiring board 17. Wiring board 17 is rectangular, are arranged along the center axis A _x of the LED bulb 1, the longitudinal direction of the end is held by the holding member 14. LED bulb 1 is fixed at an appropriate angle to the central axis A _x about as desired light distribution pattern is obtained in accordance with the attachment mechanism, therefore, the upper surface of the wiring board 17 is slightly inclined from the vertical when viewed from the front ( (About 10 °).

  As shown in FIG. 12A, the high-beam LED element 12 is located in the vicinity of the focal point of the reflector 2. Therefore, the emitted light L1 from the high-beam LED element 12 is reflected by the reflector 2 to become parallel light and far away. Irradiate. On the other hand, the low-beam LED element 13 is positioned slightly above and forward of the focal point of the reflector 2, and therefore, the emitted light L2 from the low-beam LED element 13 is reflected by the reflector 2 and illuminates the front lower side with a wide spread to the left and right.

JP 2011-210695A (Patent No. 4687762)

  FIG. 13 is a diagram showing the characteristics of the low-beam LED element 13 of FIG. 12, (A) shows the directivity characteristics of the LED element, and (B) shows the irradiation range of the reflector by the LED element.

  As shown in FIG. 13A, the directivity characteristic of the LED element 13 is a Lambertian characteristic and exhibits a strong directivity. In general, the angles at which the half value of the luminous intensity on the optical axis (θ = 0 °) is θ = 60 ° and −60 °. Accordingly, as shown in FIG. 13B, the irradiation range R1 of the low-beam LED elements 13 provided on both main surfaces of the wiring board 17 is defined by the shade 15, but a part of the upper part in the irradiation range R1. There is a low luminous intensity range R2 where the luminous intensity is low. As a result, there is a problem that a region with low illuminance occurs in the headlight distribution pattern by the low beam. In the case of the high-beam LED element 12 as well, a low luminous intensity range is generated in a partial region of the upper part and the lower part of the reflector 2, and the same problem occurs.

  In order to solve the above-described problem, a semiconductor light emitting bulb according to the present invention is provided on a rectangular wiring board and a first main surface of the wiring board, and a first light distribution pattern generation first is provided. A semiconductor light emitting element, a holding member that holds one end of the wiring board in the longitudinal direction, and a reflecting member that is provided above the first semiconductor light emitting element and has a convex reflecting surface toward the first semiconductor light emitting element. The convex reflecting surface reflects a part of the light emitted from the first semiconductor light emitting element to the vicinity of the end of the wiring board in the short direction.

  Moreover, the lighting device according to the present invention is a lighting device including a reflector having a socket into which a halogen bulb is fitted and a lens for emitting reflected light from the reflector. A light emitting bulb is provided.

  According to the present invention, it is possible to realize a light distribution characteristic that eliminates the low light intensity range.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the reflector type illuminating device concerning this invention is shown, (A) is whole sectional drawing, (B) is a perspective view of the LED bulb of (A). It is an image figure which shows the characteristic at the time of arrange | positioning a reflective member to the LED element for low beams of FIG. 1, Comprising: (A) shows directivity, (B) shows the irradiation range of the reflector by this. FIG. 2 is a detailed cross-sectional view of the LED bulb of FIG. 1. 3A and 3B show details of the wiring board of FIG. 3, in which FIG. 3A is a cross-sectional view, FIG. 3B is a top view, and FIG. It is a figure for demonstrating an effect | action of the reflective member of FIG. The 2nd Embodiment of the reflector type illuminating device which concerns on this invention is shown, (A) is whole sectional drawing, (B) is a perspective view of the LED bulb of (A). FIG. 7 is a detailed cross-sectional view of the LED bulb of FIG. 6. It is a figure for demonstrating the effect | action of the reflective member of FIG. It is detailed sectional drawing of the LED bulb as a comparative example. FIG. 1 shows a first conventional reflector type illumination device, in which (A) is an overall cross-sectional view, and (B) is a cross-sectional view of a halogen bulb of (A). It is a figure which shows the directional characteristic of the light radiate | emitted from the filament for low beams of FIG. The 2nd conventional reflector type illuminating device is shown, (A) is whole sectional drawing, (B) is a perspective view of the LED bulb of (A). It is a figure which shows the characteristic of the LED element for low beams of FIG. 12, (A) shows the directional characteristic of an LED element, (B) shows the irradiation range to the reflector by an LED element.

  1A and 1B show a first embodiment of a reflector type illumination device according to the present invention, in which FIG. 1A is an overall cross-sectional view and FIG. 1B is a perspective view of an LED bulb of FIG. The reflector type illumination device of FIG. 1 is also a vehicle headlamp device.

In FIG. 1, an LED bulb 1 ′ is provided instead of the LED bulb 1 of FIG. LED bulb 1 ', so as to obtain a desired light distribution pattern according to the mounting mechanism, it is fixed by appropriate rotation angle around the central axis A _x. 'Wiring board 17 in the' LED bulb 1, as compared to the LED circuit board 17 of the valve of Figure 12, LED valve 1 'is mounted, LED valve 1' in a state of being rotated 90 degrees about axis _{A x} about The central axis _Ax coincides with the central axis of the wiring board 17 ′. However, although FIG. 1 shows the wiring board 17 ′ as horizontal for ease of explanation, in practice, the LED bulb 1 ′ is attached so that the wiring board 17 is inclined by about 10 degrees. That, LED valve 1 ', the upper surface of the wiring board 17' is, as viewed from the front, the central axis A _x about the horizontal, is mounted in a state of slightly inclined. The wiring board 17 ′ has a substantially rectangular shape, and is detachably attached to the valve mounting hole of the reflector 2 of the vehicle headlamp via a holding member 14 that holds one end in the longitudinal direction. The holding member 14 may be formed integrally with the base 11 or may be formed separately.

  The LED elements 12 and 13 are so-called LED packages that emit blue light by covering a blue light emitting LED chip with a resin containing phosphor particles (yellow light emission). The LED elements 12 and 13 may be so-called LED chips, may be configured from an LED package including the LED chips, and can be appropriately selected.

In the LED bulb 1 ′, the wiring board 17 ′ is disposed along the central axis _Ax . The LED bulb 1 ′ is mounted in a state where the upper surface of the wiring board 17 ′ is slightly inclined (for example, 10 °) when viewed from the front. Since both ends in the short direction of the wiring board 17 ′ serve as the shade 15 in FIG. 12, the shade 15 can be configured as unnecessary.

  Further, a reflection member 20 is provided above the high beam LED element 12 and the low beam LED element 13. The reflecting member 20 has a convex reflecting surface 20a toward the light emitting surface of the LED elements 12 and 13 formed on the upper surface of the wiring board 17 '. The convex reflecting surface 20a is formed in a bilaterally symmetric shape, and is arranged so that the central axis of the LED elements 12 and 13 and the central axis of the convex reflecting surface 20a coincide. The reflecting member 20 is disposed at a predetermined distance on the light emitting surfaces of the LED elements 12 and 13 formed on the upper surface of the wiring board 17 ′. The convex reflection surface 20a reflects the emitted light from the LED elements 12 and 13, and the side of the LED elements 12 and 13 (the direction horizontal to the wiring board 17 ′) and the lower side (the direction in which the wiring board 17 is irradiated). Form the light to go. A part of the light reflected downward by the convex reflecting surface 20a is shielded at both ends of the wiring board 17 'in the short direction. Thereby, relatively high intensity light in the vicinity of the optical axis of the LED elements 12 and 13 is reflected by the convex reflecting surface 20a and shielded at both ends in the short direction of the wiring board 17 ′. A bright / dark boundary line in the light distribution as the headlamp, that is, a cut-off line can be clearly formed. By forming the reflecting member 20 sufficiently small with respect to the light emitting surfaces of the LED elements 12 and 13, the irradiation light above the LED elements 12 and 13 can maintain sufficient intensity. The reflecting member 20 is preferably formed smaller than the width of the LED elements 12 and 13, and more preferably formed smaller than the width of the light emitting surface of the LED elements 12 and 13.

Furthermore, the central axis _A top surface along the _x wiring board 17 '(first main surface) to the three high beam LED element 12 and the low-beam LED elements 13 are arranged in a straight line, along the central axis _{A x} The three high beam LED elements 12 (see FIG. 4) are linearly arranged on the lower surface (second main surface) of the wiring board 17 ′, but one or four or more LED elements are arranged depending on the amount of light flux. May be.

  Also in FIG. 1A, the high beam LED element 12 is located in the vicinity of the focal point of the reflector 2, and therefore, the emitted light L1 from the high beam LED element 12 is reflected by the reflector 2 to become parallel light and is far from far away. Irradiate. On the other hand, the low beam LED element 13 is positioned slightly in front of the focal point of the reflector 2, and thus the emitted light L <b> 2 from the low beam LED element 13 is reflected by the reflector 2 and irradiates the front lower side. In this case, part of the emitted lights L1 and L2 from the high beam LED element 12 and the low beam LED element 13 located on the upper surface of the wiring board 17 are reflected by the reflecting member 20.

High beam LED element 12, the wiring board 17 'on and along the central axis _{A x,} behind the low-beam LED element 13, i.e., are disposed on the holding member 14 side. The high-beam LED element 12 and the low-beam LED element 13 are arranged at appropriate positions according to the required light distribution, and may be arranged on the same straight line or may not be arranged on the same straight line. . Moreover, although the reflection member 20 is integrally formed on the LED element 13 and the LED element 12, it may be provided respectively and can be arrange | positioned in the position and shape according to a required light distribution.

  2A and 2B are image diagrams showing characteristics when the reflecting member 20 is arranged on the low beam LED element 13 of FIG. 1. FIG. 2A shows directivity characteristics, and FIG. 2B shows an irradiation range of the reflector.

  As shown in FIG. 2A, the directivity characteristics of the low-beam LED element 13 including the reflecting member 20 is a characteristic in which the center is weak and both ends are strong, indicating a weak directivity. Therefore, as shown in FIG. 2B, the irradiation range R1 in which the reflector 2 is directly irradiated from the low beam LED elements 13 provided on both main surfaces of the wiring board 17 ′ and the irradiation range from the reflected light by the reflecting member 20. R1 'overlaps. In this case, the upper part of the reflector 2 is also irradiated by the irradiation range R1. As a result, a low light intensity region does not occur in the light distribution pattern by the low beam. Even in the case of a high beam, the low light intensity region at the top of the reflector 2 is also eliminated.

  3 is a detailed cross-sectional view of the LED bulb 1 ′ of FIG. 1, FIG. 4 is a detailed view of the wiring board 17 ′ of FIG. 3, (A) is a cross-sectional view, (B) is a top view, and (C) is a bottom surface. FIG.

  As shown in FIGS. 3 and 4, the mounting legs 20 b and 20 c at both ends of the reflecting member 20 are fixed to the wiring board 17 by, for example, caulking and soldering. Further, the heat of the high beam LED element 12 and the low beam LED element 13 is transferred to the lower surface of the wiring board 17 ′ in which the high beam LED element 12 is provided at both ends and the low beam LED element 13 is provided on one main surface. A flat heat pipe 21 for radiating heat is soldered. In this case, since the flat heat pipe 21 is located immediately below the high beam LED element 12 and the low beam LED element 13, the cooling efficiency can be increased as compared with the conventional LED bulb 1. Further, since the flat heat pipe 21 reinforces the rigidity of the wiring board 17 ′, the thickness of the wiring board 17 ′ can be reduced to, for example, about 0.5 mm. Accordingly, since the distance between the high beam LED elements 12 on both main surfaces of the wiring board 17 'can be reduced, the high beam LED elements 12 on both main surfaces approach the point light source, and as a result, the filament diameter of the halogen bulb is reduced. You can get closer. That is, the light distribution performance of the halogen bulb can be approached, and compatibility with the halogen bulb can be improved.

  FIG. 5 is a view for explaining the operation of the reflecting member 20 of FIG.

  As shown in FIG. 5, the center of the reflecting member 20 coincides with the centers of the high beam LED element 12 and the low beam LED element 13. The width W1 of the reflecting member 20 is smaller than the width W2 of the high beam LED element 12 and the low beam LED element 13. For example, W1 / W2 = 1/2 to 1/3. The reflecting member 20 has a convex reflecting surface 20a composed of a pointed portion P1, a flat inclined surface P2, and a curved inclined surface P3. The LED element 12 (13) side has a slightly rounded point P1, a flat inclined surface P2 and a curved inclined surface P3, which have a distance from the wiring board 17 'toward the outside. Yes. That is, the planar inclined surface P2 mainly emits light emitted from the LED element 12 (13) to the wiring board 17 ', and the curved inclined surface P3 mainly emits light emitted from the LED element 12 (13) laterally and upwardly. To emit. Thereby, although the emitted lights L1 and L2 from the LED element 12 for high beams and the LED element 13 for low beams are directed right above, only a part is directed to the side. As a result, a light distribution characteristic as shown in FIG.

  Here, FIG. 9 is a detailed cross-sectional view of a conventional LED bulb 1 as a comparative example.

  In FIG. 9, the wiring board 17 provided with the low-beam LED elements 13 on both main surfaces is held from above and below by the holding frame 18. A heat pipe 19 for radiating the heat of the low beam LED element 13 through the wiring board 17 is soldered to the lower portion of the holding frame 18. For this reason, the thickness of the wiring board 17 increases, the distance between the opposing low beam LED elements 13 increases, and the low luminous intensity range R2 of FIG. 13B increases. Therefore, the area with low illuminance due to the light distribution pattern is further increased. The same applies to the high-beam LED element 12.

  Further, since the distance between the low beam LED element 13 and the heat pipe 19 is large, the cooling efficiency of the low beam LED element 13 is lowered. The same applies to the high-beam LED element 12.

  6A and 6B show a second embodiment of the reflector type lighting device according to the present invention, in which FIG. 6A is an overall cross-sectional view, and FIG. 6B is a perspective view of the LED bulb of FIG. The reflector type illumination device of FIG. 6 is also a vehicle headlamp device.

The upper surface of the wiring board 17 'in FIG. 6, three high beam LED element 12 and three low-beam LED elements 13 along the central axis A _x arranged in two rows parallel, also not shown, wiring in the lower surface of the substrate 17 ', three high beam LED elements 12 arranged in two rows parallel along the central axis a _x.

  FIG. 7 is a detailed cross-sectional view of the LED bulb 1 ′ in FIG. 6, and FIG. 8 is a view for explaining the operation of the reflecting member 20 in FIG. 6.

  As shown in FIGS. 7 and 8, the center of the reflecting member 20 and the center position of the two rows of LED elements 12 (13) are made to coincide. The width W1 of the reflecting member 20 is set larger than the gap W2 'between the two LED elements 12 (13) arranged in parallel. For example, W1 / W2 '= 2 to 3. Thereby, although the emitted lights L1 and L2 from the LED element 12 for high beams and the LED element 13 for low beams are directed right above, only a part is directed to the side. As a result, the light distribution characteristic as shown in FIG. 2B can be realized, and a larger light flux can be obtained.

  In the above-described embodiment, the reflecting member 20 is provided only on the upper surface side of the wiring board 17. However, the reflecting member 20 emits light from the high beam LED element 12 on the lower surface side of the wiring board 17 ′. A part of the emitted light of the high beam LED element 12 on the lower surface side may be reflected so as to face the surface.

  In the above-described embodiment, the LED element is used as the semiconductor light emitting element. However, the present invention can also be applied to other semiconductor light emitting elements such as a laser diode (LD) element.

  Further, the present invention can be applied to any change within the obvious range of the above-described embodiment. For example, in the above-described embodiment, one reflecting member is provided for the low beam LED element 13 and the high beam LED element 12, but a reflecting member may be provided for each.

  The lighting device according to the present invention can be used for a lighting device using a vehicle lamp such as a fog lamp and a daytime running lamp (DRL), and a reflector such as a liquid crystal projector, in addition to the headlamp device. In the case other than the headlamp device, the high beam and the low beam act as different light distribution patterns.

1, 1 ': LED bulb 2: Reflector 2a: Socket
3: Lens
11: Base
12: LED element for high beam
13: LED element for low beam
14: Holding member 15: Shade
16: Heat sink
17, 17 ': Wiring board 18: Holding frame
19: Heat pipe
20: Reflecting member 20a: Convex reflecting surface 20b, 20c: Mounting leg 21: Flat heat pipe
101: Halogen bulb 102: Reflector 103: Lens
1011: Base
1012: Glass tube 1013: High beam filament
1014: Filament for low beam 1016: Shade

Claims (7)

A rectangular wiring board;
A first semiconductor light emitting element provided on a first main surface of the wiring board for generating a first light distribution pattern;
A holding member for holding one end of the wiring board in the longitudinal direction;
A reflective member provided above the first semiconductor light emitting element and having a first convex reflective surface toward the first semiconductor light emitting element;
The convex reflecting surface is a semiconductor light emitting bulb that reflects a part of light emitted from the first semiconductor light emitting element to the vicinity of the end of the wiring board in the short direction.   The semiconductor light emitting bulb according to claim 1, wherein a width of the reflecting member is smaller than a width of the first semiconductor light emitting element. further,
A second semiconductor light emitting element linearly provided with the first semiconductor light emitting element on the first main surface of the wiring board along the central axis of the semiconductor light emitting bulb;
A third semiconductor light emitting element provided on the second main surface of the wiring board so as to face the second semiconductor light emitting element;
A second reflecting member having a second convex reflecting surface toward the second semiconductor light emitting element provided above the second semiconductor light emitting element,
The semiconductor light-emitting bulb according to claim 1, wherein the second and third semiconductor light-emitting elements are for generating a second light distribution pattern.   The convex reflection surface includes a pointed portion, a flat inclined surface that increases the distance from the wiring substrate toward the outside across the pointed portion, and a curved inclined surface formed outside the flat inclined surface. The semiconductor light-emitting bulb according to any one of claims 1 to 3, comprising a surface continuously.   2. The semiconductor light emitting bulb according to claim 1, wherein the first semiconductor light emitting elements are a plurality of semiconductor light emitting elements arranged in a plurality of rows on a central axis of the semiconductor light emitting bulb.   Furthermore, the semiconductor light-emitting bulb in any one of Claims 1-5 which comprise the heat pipe provided on the 2nd main surface of the said wiring board. In a lighting device comprising a reflector having a socket for fitting a halogen bulb, and a lens for emitting reflected light from the reflector,
An illumination device comprising the semiconductor light-emitting bulb according to claim 1 in place of the halogen lamp.

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