JP2010080082A - Lighting fixture for vehicle - Google Patents

Abstract

An object of the present invention is to provide a vehicular lamp having excellent light distribution performance by avoiding deterioration of light distribution performance due to thermal deformation of a reflector and deterioration of light distribution performance due to an assembly error of the reflector.
Since a second reflector 13 is integrally formed with a heat sink member 20 and the second reflector 13 itself has a heat dissipation function, even if the temperature is increased by radiant heat generated by light emission of a semiconductor-type light source 10, In addition to the heat radiating action of the second reflector 13 itself, heat can be radiated efficiently by the heat radiating action of the heat sink member 20, and deterioration of the light distribution performance due to thermal deformation and assembly error of the second reflector 13 is avoided.
[Selection] Figure 1

Description

  The present invention relates to a vehicular lamp used for a headlamp, a rear combination lamp, or the like of an automobile.

  In recent years, self-luminous semiconductor light sources such as light-emitting diodes (LEDs) have been used as light sources for vehicle lamps such as headlamps.

Such a semiconductor-type light source constitutes a light source unit together with a reflector that reflects the light in a predetermined direction, and is disposed in a lamp chamber composed of a housing and an outer lens (see Patent Document 1).
JP 2004-207235 A

  Semiconductor light sources used as light sources for vehicular lamps have been increased in brightness in order to enhance the illumination effect, and the amount of heat generated has increased with the increase in brightness. As a measure to suppress the temperature rise of this semiconductor type light source, a heat sink member made of a metal material having good heat dissipation is used, and the semiconductor type light source and the reflector are collectively arranged based on this heat sink member. It has been broken.

  On the other hand, the reflector is generally molded with an appropriate synthetic resin material having good moldability in order to form a complicated curved reflecting surface.

  Even with such a synthetic resin reflector, the first reflector is disposed so as to cover the periphery of the semiconductor light source and reflects the emitted light of the semiconductor light source in a predetermined direction, and the first reflector. Using a second reflector that reflects the reflected light from one reflector toward the front of the lamp, the light source unit composed of these semiconductor-type light sources, the first reflector, and the second reflector is integrated into one heat sink member. Arrangements have also been proposed.

  However, since the second reflector is disposed apart from the semiconductor-type light source and the first reflector that covers the periphery of the light source unit due to the optical design of the light source unit, and is relatively extended from the heat sink member, the second reflector is disposed. There is a difference in the heat dissipation effect of the heat sink member between the light source and the first reflector and the second reflector, that is, a temperature difference is generated and the temperature around the second reflector is higher than that around the semiconductor light source and the first reflector. There is a tendency.

  For this reason, there is a possibility that the warp deformation or bending deformation may occur in the second reflector due to the heat effect, and the light distribution performance may be deteriorated, and a configuration of the deformation preventing means is required separately. In addition to such a thermal effect, in order to satisfy the optical design, it is necessary to increase the assembly accuracy of the second reflector, and an accurate positioning means configuration is also required.

  Accordingly, the present invention provides a vehicular lamp that has excellent light distribution performance without inducing deterioration of light distribution performance due to thermal deformation of the reflector or deterioration of light distribution performance due to reflector assembly errors. It is.

  In the vehicular lamp of the present invention, a semiconductor-type light source, a first reflector that covers the semiconductor-type light source and reflects light emitted from the semiconductor-type light source in a predetermined direction, and the first reflector A second reflector that reflects the light reflected from the lamp toward the front of the lamp, and a heat sink member in which the semiconductor-type light source, the first reflector, and the second reflector are collectively disposed, and at least the second reflector. However, the main feature is that it is integrally formed with the heat sink member.

  The heat generated by turning on the semiconductor-type light source raises the temperature of the semiconductor-type light source and the first reflector that covers the semiconductor-type light source, but this heat increase is immediately transmitted to the heat sink member and efficiently dissipated by the heat sink member. .

  On the other hand, the temperature of the second reflector is increased by the radiant heat generated by the light emitted from the semiconductor-type light source. However, since the second reflector itself is integrally formed with the heat sink member and has a heat dissipation function, the periphery of the second reflector is also efficient. Heat is dissipated.

  According to the present invention, the second reflector is integrally formed with the heat sink member, and the second reflector itself has a heat dissipation function. Therefore, even if the temperature is increased by radiant heat generated by light emission from the semiconductor-type light source, In addition to the heat dissipation action of the reflector itself, heat is efficiently radiated by the heat dissipation action of the heat sink member.

  As a result, apart from the shape-retaining properties of the second reflector itself due to the inherently rigid material, the second reflector is slightly warped or bent due to the thermal effect due to the temperature difference between the semiconductor light source and the first reflector. Therefore, the light distribution performance can be improved.

  In addition, since the second reflector is integrally formed with the heat sink member as described above, there is no cause for an assembly error of the second reflector, and the position accuracy of the second reflector with respect to the semiconductor light source and the first reflector is improved. The light distribution performance can be enhanced from this point as well.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings by taking an automobile headlamp as an example.

  1 is an exploded perspective view showing a lamp unit in a headlamp according to the present invention, FIG. 2 is a plan view of the lamp unit shown in FIG. 1, FIG. 3 is a front view of the lamp unit shown in FIG. Is a side view of the lamp unit shown in FIG. 1, and FIG. 5 is a cross-sectional view taken along line AA of FIG.

  The headlamp of this embodiment shown in FIGS. 1 to 5 covers the semiconductor-type light source 10 and the front side of the lamp of the semiconductor-type light source 10, and directs the light emitted from the semiconductor-type light source 10 obliquely upward to the rear. A first reflector 11 having a concave reflecting surface 12 to be reflected, a second reflector 13 having a concave reflecting surface 14 for reflecting the light reflected by the first reflector 11 toward the front of the lamp, and a semiconductor light source And a heat sink member 20 for diffusing the heat generated at 10.

  The semiconductor-type light source 10, the first reflector 11, and the second reflector 13 constitute the light source unit 1, and the semiconductor-type light source 10, the first reflector 11, and the second reflector 13 are based on a predetermined optical design. The lamp unit 2 is composed of a combination of the light source unit 1 and the heat sink member 20.

  And this lamp unit 2 is arrange | positioned in the lamp chamber formed by the lamp housing and outer lens (projection lens) which are not shown in figure, and a headlamp is comprised.

  The semiconductor light source 10 is a light source using luminescence (light emission development) obtained by applying a voltage to a semiconductor, such as a light emitting diode (LED) or an electroluminescence (EL) including an organic EL and an inorganic EL. .

  The first reflector 11 is made of, for example, a light-impermeable synthetic resin material, and the reflective surface 12 is formed by applying aluminum vapor deposition or silver coating on the inner surface of the first reflector 11.

  The reflection surface 12 of the first reflector 11 is formed of an ellipse or a reflection surface based on an ellipse, for example, a free-form surface based on a spheroid or ellipse.

  As shown in FIG. 5, the first reflector 11 includes a first focal point F1 and a second focal point F2, and the light emitted from the first focal point F1 is reflected by the reflecting surface 12 of the first reflector 11 and is first. Focuses on two focal points F2.

  The light emitting unit 10a of the semiconductor light source 10 is disposed at the position of the first focal point F1 of the first reflector 11 or in the vicinity thereof. Thereby, of the light emitted from the semiconductor-type light source 10, the light reflected by the reflecting surface 12 of the first reflector 11 is collected at the second focal point F <b> 2 of the first reflector 11 or in the vicinity thereof.

  The second reflector 13 is formed integrally with the heat sink member 20 so as to protrude obliquely upward and forward from the upper end of the heat sink member 20.

  The second reflector 13 is erected in a concave shape from the rear edge of the upper end surface 20a formed in a substantially horizontal flat shape of the heat sink member 20, and the reflection surface 14 is formed on the inner surface thereof.

  The reflection surface 14 of the second reflector 13 is formed by applying aluminum vapor deposition or silver coating on the inner surface of the second reflector 13, and polishing the inner surface of the second reflector 13 to give a mirror surface. Can be formed.

  As shown in FIG. 5, the reflecting surface 14 of the second reflector 13 is formed in a free-form surface based on a parabola and has a focal point F3. The focal point F3 is located at the second focal point F2 of the first reflector 11, whereby the light reflected by the reflective surface 12 of the first reflector 11 and collected at the second focal point F2 is reflected on the reflective surface. 14 is reflected toward the front of the lamp as parallel light L.

  The heat sink member 20 is made of a metal material having good thermal conductivity, for example, made of aluminum diecus, and a plurality of vertical radiating fins 21 are arranged in a row at equal intervals in the vehicle width direction on the back surface thereof.

  The heat sink member 20 also serves as a base on which the semiconductor light source 10, the first reflector 11 and the second reflector 13 are intensively disposed, and dissipates heat generated by the semiconductor light source 10. As described above, the plurality of vertical radiating fins 21 are arranged in the vehicle width direction in the middle of the back surface of the second reflector 13, while the front surface is formed to be flat and inclined obliquely upward. The first reflector mounting surface 22 is used.

  A light source mounting surface 23 for mounting the semiconductor-type light source 10 is formed in a stepped manner at the center of the first reflector mounting surface 22.

  The substrate 10b of the semiconductor-type light source 10 is superposed on the light source mounting surface 23, and the light emitting portion 10a is faced forward and accurately positioned and fixed by locating pins and screws (not shown).

  A transparent protective cover 10C that covers the semiconductor light source 10 almost entirely is positioned on the light source mounting surface 23 by a locating pin 27 and fastened and fixed by a screw (not shown) (see FIG. 2).

  Then, covering the front side of the lamp of the semiconductor light source 10, the first reflector 11 is accurately positioned and fastened to the first reflector mounting surface 22 by the locate pin 25 and the screw 26.

  A cut-off line having a predetermined shape is formed on the upper edge of the light distribution pattern by shielding a part of the emitted light of the semiconductor light source 10 at the upper portion of the front surface of the heat sink member 20, specifically, the upper portion of the first reflector 11. The shade 24 to be formed is projectingly molded. The corner edge where the shade edge 24a at the upper edge of the shade 24, that is, the projection that forms the shade 24, and the substantially horizontal flat upper end surface 20a are continuous is the second focal point of the first reflector 11. F2 and the position of the third focal point F3 of the second reflector 13 substantially coincide with each other.

  In the present embodiment, the semiconductor-type light source 10, the first reflector 11, and the second reflector 13 are configured as one set of light source units 1, and the two sets of light source units 1 and 1A are based on the one heat sink member 20. As well as in the left and right direction.

  That is, one light source unit 1 is a light source unit for forming a low beam (passing beam) in which a cut-off line having a predetermined shape is formed on the upper edge of the light distribution pattern by the shade 24 as described above. The unit 1A is configured as a light source unit for forming a high beam (traveling beam) without the shade 24.

  The second reflector 13A of the light source unit 1A for forming the high beam has a shape slightly smaller than the second reflector 13 of the light source unit 1 for forming the low beam, and is connected to the second reflector 13 so as to be connected to the heat sink member 20. And is integrally molded.

  Further, the lower edge position of the reflecting surface 14A of the semiconductor light source 10A, the first reflector 11A, and the second reflector 13A of the light source unit 1A for high beam formation corresponds to the corresponding portions (10, 11,. 14), a predetermined diffused light distribution pattern is obtained by shifting the position upward and forward based on a predetermined optical design.

  Accordingly, the first reflector mounting surface 22A, the light source mounting surface 23A, and the upper end surface 20a on which the high beam forming light source unit 1A is disposed are respectively corresponding mounting surfaces 22 on which the low beam forming light source unit 1 is disposed. , 23 and the upper end surface 20a are shifted upward and forward.

  In this way, the lamp unit 2 configured by using two heat source units 1 and 1A as the left and right sides with one heat sink member 20 as a base straddles the heat sink member 20 and a lamp housing (not shown). By an aiming mechanism comprising an aiming bolt and a pivot provided, it is assembled in the lamp chamber so that the optical axis can be adjusted.

  In the headlamp according to the present embodiment having the above-described configuration, the periphery of the first reflectors 11 and 11A covering the semiconductor-type light sources 10 and 10A and the front side of the lamp is generated by the heat generated by the lighting of the semiconductor-type light sources 10 and 10A. Although the temperature rises, this heat increase is immediately transmitted to the heat sink member 20 and is efficiently radiated by the heat sink member 20.

  On the other hand, the temperature of the second reflector 13 (13A) is raised by the radiant heat generated by the light emission of the semiconductor-type light source 10 (10A), but the second reflector 13 (13A) itself is integrally formed with the heat sink member 20 and has a heat dissipation function. Since it is provided, heat is efficiently radiated by the heat radiation action of the heat sink member 20 in addition to the heat radiation action of the second reflector 13 (13A) itself.

  As a result, apart from the shape retention due to the inherently rigid material of the second reflector 13 (13A) itself, due to the thermal effect due to the temperature difference between the semiconductor light source 10 (10A) and the first reflector 11 (11A), The second reflector 13 (13A) is not slightly warped or bent, and the light distribution performance can be improved.

  Further, since the second reflector 13 (13A) is integrally formed with the heat sink member 20 as described above, there is no cause for an assembly error of the second reflector 13 (13A), and the semiconductor light source 10 (10A) ) And the position accuracy of the second reflector 13 (13A) relative to the first reflector 11 (11A) can be increased, and the light distribution performance can also be improved from this point.

  Further, in the present embodiment, a shade 24 is formed in a continuous portion between the heat sink member 20 and the second reflector 13, and the semiconductor-type light source 10 directly attached to the heat sink member 20, the shade 24, and the second Since the positional accuracy with respect to the two reflectors 13 is increased, it is possible to avoid the shift of the cut-off line of the light distribution pattern.

  Further, in the present embodiment, the second reflectors 13 and 13A in the pair of left and right light source units 1 for forming a low beam and the light source unit 1A for forming a high beam provided side by side with a single heat sink member 20 are connected in series. The heat sink member 20 is integrally molded in the state, and the positional relationship among the semiconductor-type light sources 10 and 10A, the first reflectors 11 and 11A, and the second reflectors 13 and 13A in each light source unit 1 and 1A is kept constant. In addition, since the assembly accuracy of both units can be improved without causing a positional deviation between the light source units 1 and 1A, the positional deviation of the light distribution patterns of the left and right light source units 1 and 1A can be prevented, The light distribution performance of the synthetic light distribution pattern can be improved.

  In the above embodiment, the first reflectors 11 and 11A are made of a separate synthetic resin. However, the first reflectors 11 and 11A may be integrally formed with the heat sink member 20 in some cases.

  In the above embodiment, the vehicle headlamp has been described as an example, but the present invention can also be applied to a rear combination lamp.

The perspective view which decomposes | disassembles and shows the lamp unit of the headlamp which concerns on one Embodiment of this invention. The top view of the lamp unit shown in FIG. The front view of the lamp unit shown in FIG. The side view of the lamp unit shown in FIG. Sectional drawing which follows the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Light source unit 2 Lamp unit 10, 10A Semiconductor type light source 11, 11A 1st reflector 12, 12A Reflective surface of 1st reflector 13, 13A Second reflector 14, 14A Reflective surface of 2nd reflector 20 Heat sink member 24 Shade

Claims (3)

A semiconductor light source;
A first reflector that covers the semiconductor-type light source and reflects light emitted from the semiconductor-type light source in a predetermined direction;
A second reflector that reflects the reflected light from the first reflector toward the front of the lamp;
A heat sink member in which the semiconductor-type light source and the first reflector and the second reflector are collectively disposed,
A vehicular lamp characterized in that at least the second reflector is formed integrally with the heat sink member.   2. The vehicular lamp according to claim 1, wherein a shade that forms a cut-off line of a predetermined shape is formed on an upper edge of the light distribution pattern at a portion where the heat sink member is connected to the second reflector. .   3. The semiconductor light source, the first reflector, and the second reflector constitute a set of light source units, and a plurality of sets of the light source units are provided side by side with the one heat sink member. The vehicle lamp as described in 2.

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