JP2013229131A - Separator fixing structure of vehicle lamp - Google Patents

Abstract

To provide a separator fixing structure for a vehicular lamp capable of preventing desired bending deformation and melting damage of a separator due to heat, increasing the luminous flux utilization factor of a light source, and stably performing desired cutoff control.
As a fixing structure of the separator of a vehicular lamp provided with a separator arranged close to the front of an LED (light source) and individually dividing light from the LED, the separator is positioned at the center in the width direction. A hole 14d is formed, a positioning pin 14A is projected from a heat sink (fixing member) 11 for fixing the separator 14, the positioning pin 14A is inserted into the positioning hole 14d of the separator 14, and the separator 14 is inserted into the heat sink 11. And adopting a configuration in which both end portions in the width direction of the separator 14 are held by the heat sink 11 by the holder 15.
[Selection] Figure 5

Description

  The present invention relates to a fixing structure of the separator of a vehicle lamp provided with a separator that divides light from a light source individually.

  When driving a vehicle at night, the headlamps are basically a high beam, but if you pass by an oncoming vehicle or drive immediately after another vehicle, you may run a low beam because it may give glare to surrounding vehicles. I am doing so. However, the low beam of the high beam has a disadvantage that it is difficult to see a pedestrian on the road shoulder or across the road.

  Therefore, an ADB (Adaptive Driving Beam) headlamp (variable light distribution headlamp) has been proposed (see, for example, Patent Document 1). In this ADB headlamp, the high beam distribution pattern faces the preceding vehicle. A shadow (cut-off) is formed only on the part that gives glare to the car. Specifically, the presence / absence of a preceding vehicle or an oncoming vehicle detected by the sensing camera and the position information with respect to the host vehicle are converted into a control signal for changing the light distribution pattern by the ECU, and the variable light distribution pattern is formed by the headlamp. I have to.

  In a headlamp using light emitting elements such as LEDs as a light source, a separator that divides light from a plurality of light emitting elements individually in a high beam region is arranged close to the light emitting element, and the light from the light emitting element is divided by this separator. Then, the cut-off is formed by irradiating.

  Here, the separator and its fixing structure will be described below with reference to FIGS.

  6 is a front view showing a conventional separator fixing structure, FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6, and FIG. 8 is an enlarged detail view of a portion D of FIG. 114 is attached to the mounting surface of the heat sink 111 which is a fixing member together with the substrate 112 on which the plurality of LEDs 113 which are light sources are mounted by fastening the left and right with screws 120.

  The separator 114 is an optical component that individually divides the light emitted from the LED 113, and is formed in a rectangular box shape having an open front surface (light emitting surface). The surface that receives light from the LED 113 (opposite the LED 113). A plurality of rectangular openings 114b for allowing the light from the LEDs 113 to enter are formed in a lateral direction at an appropriate interval (the same interval as the arrangement pitch of the LEDs 113). Further, as shown in FIG. 8, a reflection surface 114 c that reflects light incident from the opening 114 b forward is formed on the left and right front sides of the opening 114 b of the separator 114.

  Thus, when each LED 113 is energized and emits light, the light L from each LED 113 is incident on each opening 114b of the separator 114 as shown in FIG. 8, and formed on the left and right front of each opening 114b. The light is divided by being reflected by the reflecting surface 114c, and is projected onto a high beam area through a lens (not shown) disposed in front (upper part of FIG. 7) to be used for illumination in front of the vehicle at night. Is done.

JP 2012-003986 A

  By the way, the separator 114 shown in FIG.6 and FIG.7 is extended by thermal expansion from the center of the width direction where LED113 concentrates to the right-and-left both ends, when temperature rises by the thermal radiation from LED113 or absorption of light.

  However, since the left and right ends of the separator 114 are fixed to the heat sink 111 by screws 120, the separator 114 is bent and deformed so that the center in the width direction is convex toward the front as shown in FIG. Since the light L cannot be taken into each opening 114b of the separator 114, there arises a problem that the luminous flux utilization factor of the LED 113 is lowered. When the luminous flux utilization factor of the LED 113 is reduced in this way, most of the light is converted into heat, so that the separator 114 becomes hot due to heat, and when the temperature exceeds the heat resistance temperature of the material, the separator 114 is melted. Therefore, there arises a problem that desired light distribution control (cut-off control) cannot be performed.

  The present invention has been made in view of the above circumstances, and its objective is to prevent the separator from being bent and melted by heat and to increase the luminous flux utilization factor of the light source to stably perform desired cut-off control. Another object of the present invention is to provide a separator fixing structure for a vehicle lamp.

  In order to achieve the above object, the invention according to claim 1 is a fixing structure of the separator of a vehicular lamp including a separator that is arranged in front of a light source and separately divides the light from the light source. A positioning hole is formed in the center of the separator in the width direction, a positioning pin is projected from a fixing member for fixing the separator, and the positioning pin is inserted into the positioning hole of the separator to position the separator with respect to the fixing member. In addition, both end portions in the width direction of the separator are held on the fixing member by holders.

  According to a second aspect of the present invention, in the first aspect of the invention, the light source is constituted by a light emitting element mounted on a substrate, the fixing member is constituted by a heat sink, and is formed at the center in the width direction of the substrate. A positioning pin projecting from the mounting surface of the heat sink is inserted through the positioning hole and the positioning hole of the separator to position the substrate and the separator with respect to the heat sink, and both widthwise ends of the both are positioned by the holder. The heat sink is held.

  According to the present invention, the center in the width direction of the separator is positioned with respect to a fixing member such as a heat sink, and both end portions in the width direction of the separator are held on the fixing member by the holder. When the temperature of the separator rises due to light absorption, the separator can freely extend to the left and right starting from the center in the width direction. In this way, the left and right end portions of the separator are not fixed to the fixing member, and can freely extend in the left and right directions with respect to the fixing member. All of the light is taken into the opening of the separator, and the luminous flux utilization factor of the light source is increased. As a result, the conversion of light into heat is suppressed, the temperature rise of the separator is also suppressed, the separator is prevented from being melted, and desired cut-off control is stably performed.

It is a plane sectional view of a headlamp. It is a disassembled perspective view of the light source unit of a headlamp. It is a front view which shows the separator fixing structure which concerns on this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a front part which shows the conventional separator fixing structure. It is CC sectional view taken on the line of FIG. It is the D section enlarged detail drawing of FIG. FIG. 8 is an enlarged detail view of a part D in FIG. 7 showing the bending deformation of the separator.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a plan sectional view of a headlamp, FIG. 2 is an exploded perspective view of a light source unit of the headlamp, FIG. 3 is a front view showing a separator fixing structure according to the present invention, and FIG. 5 is a cross-sectional view taken along the line BB in FIG.

  A headlamp 50 shown in FIG. 1 includes a housing 51 and a high beam lamp unit 1 in a lamp chamber S and a low beam lamp unit 60 defined by a transparent outer lens 52 covering a front opening of the housing 51. . In FIG. 1, 53 is an extension.

  The high beam lamp unit 1 is arranged behind the projection lens 2 arranged on the optical axis X extending in the vehicle longitudinal direction, the cylindrical bezel 3 holding the projection lens 2 and the rear focal plane of the projection lens 2. The light source unit 10 is included.

  The projection lens 2 is an aspheric lens, and the bezel 3 for holding the projection lens 2 is attached to a heat sink 11 provided in the light source unit 10 by screws.

  The heat sink 11 provided in the light source unit 10 is integrally formed by aluminum die casting or the like having high thermal conductivity, and a plurality of heat radiating fins 11a are integrally formed thereon. As shown in FIGS. 2 and 5, in the light source unit 10, a rectangular flat substrate 12 is disposed on the front surface of the heat sink 11, and a plurality of LEDs (light emitting elements) (on the substrate 12). Light emitting diodes) 13 are mounted at appropriate intervals in the horizontal direction. In this embodiment, the LED 13 is used as the light emitting element, but a laser diode or the like can be used as the light emitting element in addition to the LED 13.

  In addition, on the front surface of the substrate 12, a laterally elongated separator 14 is disposed with a minute gap between the LED 13. The separator 14 is an optical component that individually divides the light emitted from the LED 13 and is integrally formed of polyetherimide (PEI) in the present embodiment.

  Here, the separator 14 is formed in a rectangular box shape having an open front surface (light emitting surface), and plate-like mounting brackets 14A are integrally formed at both left and right ends thereof. Each mounting bracket 14A is formed with a rectangular through hole 14a.

  In addition, rectangular openings 14b for allowing light from the LEDs 13 to enter are arranged at appropriate intervals (arrays of the LEDs 13) at positions facing the LEDs 13 on the surface of the separator 14 that receives light from the LEDs 13 (the rear surface facing the LEDs 13). A plurality of lines are formed in the horizontal direction at the same interval as the pitch). And the reflective surface 14c which reflects the light which injected from the opening part 14b ahead is formed in the left-right front of the opening part 14b of the separator 14, as shown in FIG.4 and FIG.5. In the present embodiment, polyetherimide (PEI) is used as the material of the separator 14, but metal members such as polyphenylene sulfide (PPS) and sheet metal may be used in addition thereto.

  Next, the fixing structure of the separator 14 according to the present invention will be described.

  As described above, the separator 14 is disposed on the front surface of the substrate 12 with a small gap between the LED 13. In this embodiment, the separator 14 and the substrate 12 are fixed according to the present invention. It is fixed as follows according to the structure.

  That is, as shown in FIGS. 2 and 3, rectangular plate-shaped positioning brackets 14B are formed above and below the center of the separator 14 in the width direction, and circular positioning holes 14d are formed in these positioning brackets 14B. Each is formed. As shown in FIGS. 2 and 4, circular positioning holes 12 a are formed at the top and bottom of the substrate 12 in the center in the width direction (locations corresponding to the positioning holes 14 d of the separator 14). As shown in FIG. 5, rectangular through-holes 12b communicating with through-holes 14a formed in the mounting brackets 14A on the left and right ends of the separator 14 disposed on the front surface of the substrate 12 as shown in FIG. Is formed.

  On the other hand, as shown in FIGS. 2 and 4, positioning pins 11 </ b> A are provided on the upper and lower sides (locations corresponding to the upper and lower positioning holes 14 d and 12 a of the separator 14 and the substrate 12) of the mounting surface (front surface) of the heat sink 11. Are protruded horizontally toward the front. In addition, as shown in FIG. 5, engagement holes 11 b are formed in both left and right ends of the heat sink 11.

  Thus, the substrate 12 and the separator 14 on which the plurality of LEDs 13 are mounted are positioned on the positioning holes 11a and 14d formed above and below the center in the width direction, and the positioning pins 11A protruding above and below the mounting surface of the heat sink 11 Is positioned with respect to the heat sink 11 by inserting as shown in FIG. The left and right ends of the substrate 12 and the separator 14 thus positioned with respect to the heat sink 11 are held by the heat sink 11 by the holder 15.

  As shown in FIG. 2, the holder 15 is configured to be bent in a U-shape in plan view according to the outer shape of the separator 14 by resin or sheet metal. A laterally long opening 15a for allowing the divided light to pass therethrough is formed. And the engaging part 15A provided with the spring structure is formed in the right and left both ends of this holder 15, respectively. The holder 15 is made of resin such as polycarbonate, amorphous polyarylate, polyetherimide, polyamide, or SUS3012, SUS304, SUS340, SWP-A, SWP-B, SWOSC-B, SWOSC-V, SUS316-WPA, A sheet metal such as SUS631J1-WPC, SUP-9, or SUP-12 is used.

  By the way, the engaging portion 15A formed integrally with the left and right ends of the holder 15 includes a pressing portion 15b formed in a convex shape from the front surface of the holder 15 toward the rear on the left and right sides of the opening 15a of the holder 15, and a holder. An elastic claw 15c having an outward folding portion formed by inward raising and lowering on both the left and right sides of 15 and the holder 15 is bent in a V shape with the rear edge of the holder 15 facing inward. And a locking claw 15d. As shown in FIG. 4, a pressing portion 15 e that is bent in a U shape toward the inside is formed on the periphery of the opening 15 a of the holder 15.

  Thus, the holder 15 configured as described above is attached to the separator 14 so as to cover the outer surface of the separator 14 as shown in FIGS. The engaging portion 15A holds the separator 14 and the substrate 12 on the heat sink 11 as shown in FIG. That is, the pressing portions 15b formed in the engaging portions 15A at the left and right ends of the holder 15 press the front surface of the separator 14 superimposed on the front surface of the substrate 12 toward the heat sink 11 (rear side). The portions of the elastic claws 11c that are formed outwardly of the elastic claws 11c come into contact with the left and right sides of the separator 14. Further, the locking claws 15d of the left and right engaging portions 15A of the holder 15 are the separator 14 overlaid on the mounting surface (front surface) of the heat sink 11, the through holes 14a and 12b formed at the left and right ends of the substrate 12, and the heat sink. 11 is inserted into the heat sink 11 through the engagement holes 11b formed at the left and right end portions of the heat sink 11, and the end portions are locked to the periphery of the engagement holes 11b of the heat sink 11 as shown in FIG. Further, as shown in FIG. 4, the pressing portion 15 e formed on the periphery of the opening 15 a of the holder 15 abuts on the periphery of the opening 14 b that opens on the front surface of the separator 14 to press the separator 14 against the substrate 12. More specifically, the upward lifting of the central portion of the separator 14 caused by the thermal expansion of the separator 14 in the left-right direction (outward direction) due to the heat of the LED 13 is caused by the pressing portion 15b, the locking portion 15d, and the pressing portion 15a And the thermal expansion of the separator 14 in the left-right direction (outward direction) is absorbed by the spring-backed portions of the elastic claws 15c that come into contact with the left and right side portions of the separator 14 in the outward direction.

  As described above, the separator 14 and the substrate 12 are held by the heat sink 11 by the engaging portions 15 </ b> A at the left and right ends of the holder 15 with the center portion in the width direction positioned on the heat sink 11. Fixed to the mounting surface (front surface).

  Thus, in the present embodiment, the center in the width direction of the separator 14 and the substrate 12 is positioned with respect to the heat sink 11, and both end portions in the width direction of the separator 14 and the substrate 12 are held on the heat sink 11 by the holder 15. When the temperature of the separator 14 rises due to heat radiation from each LED 13 or absorption of light, the separator 14 can freely extend to the left and right starting from the center in the width direction.

  As described above, in the present embodiment, the separator 14 is not fixed to the heat sink 11 at both right and left ends, and can freely extend in the left and right directions with respect to the heat sink 11, so that it is also deformed by thermal expansion. Thus, all of the light L from the LED 13 is taken into the opening 14b of the separator 14 as shown in FIG. 5, and the luminous flux utilization factor of the LED 13 is increased. As a result, the conversion of light into heat is suppressed, the temperature rise of the separator 14 is also suppressed, the melting damage of the separator 14 is prevented, and desired cut-off control is stably performed.

DESCRIPTION OF SYMBOLS 1 High beam lamp unit 2 Projection lens 3 Bezel 10 Light source unit 11 Heat sink 11A Heat sink positioning pin 11a Heat sink radiating fin 11b Heat sink engagement hole 12 Substrate 12a Substrate positioning hole 12b Substrate through hole 13 LED (light emitting element)
14 Separator 14A Separator mounting bracket 14B Separator positioning bracket 14a Separator through-hole 14b Separator opening 14c Separator reflecting surface 14d Separator positioning hole 15 Holder 15A Holder engagement 15a Holder opening 15b Holder pressing Part 15c Holder elastic claw 15d Holder locking claw 15e Holder pressing part 15b Front edge of upper and lower surfaces of heat dissipating member 50 Headlamp 51 Headlamp housing 52 Headlamp outer lens 53 Headlamp extension 60 Low beam lamp unit S Light room X Optical axis

Claims (2)

The separator fixing structure of a vehicle lamp comprising a separator that is disposed in front of a light source and separately divides light from the light source,
A positioning hole is formed in the center of the separator in the width direction, a positioning pin is protruded from a fixing member for fixing the separator, the positioning pin is inserted into the positioning hole of the separator, and the separator is fixed to the fixing member. A separator fixing structure for a vehicular lamp characterized by positioning and holding both ends of the separator in the width direction on the fixing member by a holder. The light source is composed of a light emitting element mounted on a substrate, the fixing member is composed of a heat sink, and the positioning hole formed in the center in the width direction of the substrate and the positioning hole of the separator project on the mounting surface of the heat sink 2. The vehicle according to claim 1, wherein the positioning pin is inserted to position the substrate and the separator with respect to the heat sink, and both end portions in the width direction are held on the heat sink by the holder. Separator fixing structure for lighting equipment.

Images