JP2010049892A - Lighting lamp for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to form a light distribution pattern suitable for structuring a center part of the light distribution pattern for high beam having a compact structure, in a lighting lamp for a vehicle using a light-emitting device as a light source. <P>SOLUTION: The lighting lamp for a vehicle incldues a structure making light from a light-emitting element 12 to deflect and emit further forward than a lens 14. At that time, a light-emitting center O of the light-emitting device 12 is arranged to be vertically shifted downward from an optical axis Ax. Meanwhile, the lens 14 is structured with a pair of right and left fan-shaped regions 14A1, 14A2 as reflecting-type Fresnel lenses, and with the other up-and-down pair of fan-shaped regions 14B1, 14B2 as plain lenses. At that time, each of the up-and-down pair of fan-shaped regions 14B1, 14B2, is formed in an angle-limited region with its center angle of 60°. With this, a nearly fan-shaped light distribution pattern with its end edge extended in a nearly horizontal direction, is enabled to be formed with slightly larger center angle than 180°. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicular illumination lamp configured to deflect and emit light from a light emitting element such as a light emitting diode forward by a lens.

  In recent years, a vehicular illumination lamp using a light emitting element as a light source has been adopted in a vehicular headlamp.

  For example, in “Patent Document 1”, a light emitting element is arranged behind the rear focal point of the projection lens arranged on the optical axis extending in the vehicle front-rear direction, and the light from the light emitting element is moved closer to the optical axis by the reflector. A projector-type vehicular illumination lamp that is configured to reflect light is described.

JP 2008-91349 A

  Since the vehicular illumination lamp described in the above-mentioned “Patent Document 1” is configured as a projector-type vehicular illumination lamp, the front and rear length of the lamp is long.

  On the other hand, if a direct illumination type vehicle illumination lamp configured to deflect and emit light from the light emitting element forward by a lens disposed on the front side of the light emitting element, the front and rear length of the lamp can be reduced. Can be shortened. At this time, if the lens is made of a Fresnel lens, the front and rear length of the lamp can be further shortened to make it compact.

  However, there is a problem that it is not easy to form a light distribution pattern suitable for the configuration of the central portion of the high beam light distribution pattern in a direct-type vehicle illumination lamp using such a light emitting element as a light source.

  That is, if the road surface in front of the vehicle is illuminated more brightly than necessary in the high beam light distribution pattern, the visibility in the distance will be reduced. Therefore, it is preferable that the light distribution pattern constituting the central portion of the high beam light distribution pattern is a substantially fan-shaped light distribution pattern whose lower end edge extends in a substantially horizontal direction. However, it is not easy to form a light distribution pattern having such a shape in a direct-type vehicle illumination lamp using a light emitting element as a light source.

  The present invention has been made in view of such circumstances, and in a vehicular illumination lamp using a light-emitting element as a light source, the configuration of the center portion of a high-beam light distribution pattern after having a compact configuration. It is an object of the present invention to provide a vehicular illumination lamp capable of forming a light distribution pattern suitable for a vehicle.

  The present invention is intended to achieve the above-mentioned object by making a direct-lighting type vehicle illumination lamp and devising the arrangement of the light-emitting elements and the lens configuration.

That is, the vehicular illumination lamp according to the present invention is:
A vehicle comprising: a light emitting element disposed in the vicinity of an optical axis extending in the front-rear direction of the lamp; and a lens disposed in front of the light emitting element and deflecting and emitting light from the light emitting element forward. In lighting fixtures,
The light emitting element is disposed so as to shift the light emission center of the light emitting element from the optical axis,
The lens is formed with a plurality of annular prisms extending concentrically around the optical axis in a state where a cross-sectional shape along a plane including the optical axis is set in a sawtooth shape on a rear surface of the lens. It is configured as a Fresnel lens that emits light from a predetermined point on the optical axis located on the rear side of the lens toward the front as light parallel to the optical axis,
The Fresnel lens causes the light from the predetermined point to enter the annular prism in a manner that refracts the light from the optical axis on the inner peripheral surface of each annular prism, and then causes the incident light to enter the annular prism. It is configured as a reflective Fresnel lens that totally reflects forward on the outer peripheral surface of the belt-like prism,
When the angle between a straight line connecting the light emission center of the light emitting element and the optical axis and a straight line extending vertically downward from the optical axis is θ / 2 in the front view of the lamp, θ / 2 from the optical axis in the lens. An angle range region having a central angle of 45 to 90 ° with respect to a straight line extending in the direction of the angle, and an angle range region having a central angle of 45 to 90 ° with respect to a straight line extending in the direction of θ / 2 + 180 ° from the optical axis. It is set as a region that is not configured as a reflection type Fresnel lens.

  The above-mentioned “light emitting element” means an element-like light source that emits light in a substantially dot-like manner, and the type of the light source is not particularly limited. For example, a light emitting diode or a laser diode can be adopted. is there. Further, the shape and size of the light emitting surface of the light emitting element are not particularly limited.

  The above “light emitting element” is disposed so that the light emission center of the light emitting element is shifted from the optical axis, but may be disposed so as to be shifted in any direction with respect to the optical axis, Further, the specific value of the shift amount is not particularly limited.

  The “region that is not configured as a reflection type Fresnel lens” may be configured as a through lens or may be configured to have an appropriate lens function.

  As shown in the above configuration, the vehicular illumination lamp according to the present invention directs light from a light emitting element disposed in the vicinity of the optical axis extending in the front-rear direction of the lamp to the front by a lens disposed on the front side thereof. However, since the lens is configured as a Fresnel lens, the front and rear length of the lamp can be shortened to make it compact.

  In this case, the Fresnel lens makes light incident from the predetermined point incident on the annular prism in a manner in which the light is refracted in a direction away from the optical axis on the inner peripheral surface of each annular prism. Since it is configured as a reflective Fresnel lens that totally reflects forward on the outer peripheral surface of the annular prism, it is assumed that the light emission center of the light emitting element is located on the optical axis and the reflective Fresnel lens is If it is formed over the entire circumference, the optical action causes the light emitting surface image of the light emitting element to be centered on the intersection of the virtual vertical screen and the optical axis on the virtual vertical screen arranged in front of the lamp. It is formed over the entire circumference.

  In that respect, in the vehicular illumination lamp according to the present invention, the light emitting element is disposed so that the light emission center is shifted from the optical axis, and the light emission center and the optical axis of the light emitting element are viewed from the front of the lamp. Is an angle range of 45 to 90 ° with respect to a straight line extending in the direction of θ / 2 from the optical axis in the lens, where θ is an angle formed by a straight line connecting the straight line and the straight line extending vertically downward from the optical axis. Since an angle range region having a central angle of 45 to 90 ° with respect to a region and a straight line extending in the direction of θ / 2 + 180 ° from the optical axis is set as a region not configured as a reflective Fresnel lens, a virtual vertical screen In the above, it is possible to form a substantially fan-shaped light distribution pattern in which the lower end edge extends in a substantially horizontal direction with a center angle slightly larger than 180 ° with the intersection point as a center. Therefore, this light distribution pattern can be a light distribution pattern that irradiates far away without irradiating the road surface ahead of the vehicle more than necessary.

  At this time, as an optical action of the reflection type Fresnel lens, a region not configured as the reflection type Fresnel lens is defined as a straight line extending in the direction of θ / 2 and θ, regardless of the value of the angle θ. By setting each of the straight lines extending in the direction of / 2 + 180 ° as an angle range region having a central angle of 45 to 90 °, a substantially sector shape having a central angle slightly larger than 180 ° and a lower end edge extending in a substantially horizontal direction. The light distribution pattern can be formed.

  At that time, when the central angle in each of the two angular range regions approaches 45 °, the central angle of the substantially fan-shaped light distribution pattern becomes somewhat larger than 180 °, and the lower edge thereof is directed to the left and right sides. On the other hand, when the central angle approaches 90 °, the central angle of the substantially fan-shaped light distribution pattern approaches 180 °, and the downward inclination angle of its lower edge becomes close to zero. .

  As described above, according to the present invention, in the vehicular illumination lamp using the light emitting element as a light source, the light distribution pattern suitable for the configuration of the central portion of the high beam light distribution pattern is formed after the compact configuration. be able to.

  In the vehicular illumination lamp according to the present invention, if the shift amount of the light emission center of the light emitting element from the optical axis is set to a small value, the central portion of the substantially fan-shaped light distribution pattern can be brightened. On the other hand, if the shift amount is set to a large value, a substantially fan-shaped dark portion can be formed at the center of the substantially fan-shaped light distribution pattern, and the peripheral portion of the dark portion can be brightened. When the dark portion is formed in this way, the surrounding area can be illuminated brightly without giving glare to the driver of the preceding vehicle.

  In the above configuration, if the distance from the light emission center of the light emitting element to the optical axis can be changed, the central portion of the substantially fan-shaped light distribution pattern can be brightened according to the traveling situation, or the substantially fan-shaped light distribution pattern can be changed. A substantially fan-shaped dark part can be formed in the center part.

  In this case, as a specific configuration for enabling the distance from the light emission center of the light emitting element to the optical axis to be changed, the distance is changed by changing the area of the light emitting surface of the light emitting element. Alternatively, the distance may be changed by moving the light emitting surface of the light emitting element in the radial direction with respect to the optical axis.

  In the above configuration, if the light emitting element is arranged so that the light emitting surface does not overlap the optical axis when viewed from the front of the lamp, the light distribution pattern has a substantially fan-shaped light distribution pattern at the center of the light distribution pattern. The light pattern can be formed so as not to protrude downward from the lower edge of the light pattern. As a result, it is possible to reliably prevent the road surface in front of the vehicle from being illuminated more brightly than necessary.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a vehicular illumination lamp 10 according to an embodiment of the present invention. 2 is a cross-sectional view taken along line II-II in FIG.

  As shown in these drawings, the vehicular illumination lamp 10 according to the present embodiment includes a light emitting element 12 that is disposed forward in the vicinity of the optical axis Ax that extends in the front-rear direction of the lamp, and a front side of the light emitting element 12. The lens 14 is arranged to deflect light emitted from the light emitting element 12 forward and a metal holder 16 that supports the light emitting element 12 and the lens 14.

  The vehicular illumination lamp 10 is used together with a head lamp unit (not shown) so as to be incorporated in a lamp body or the like (not shown) so that the optical axis can be adjusted. The optical axis Ax extends in the vehicle front-rear direction. The vehicular lamp 10 is turned on when the headlamp unit is in a high beam state to form a light distribution pattern that forms the center of the high beam light distribution pattern.

  The lens 14 of the vehicular illumination lamp 10 is a disk-shaped member made of a colorless and transparent acrylic resin and having an outer diameter of about φ80 mm, and is a pair of left and right sectors located on the left and right sides of the optical axis Ax. The areas 14A1 and 14A2 are configured as reflective Fresnel lenses (which will be described later), and the other pair of upper and lower fan-shaped areas 14B1 and 14B2 are configured as through lenses.

  In other words, the front surface 14a of the lens 14 is configured by a plane orthogonal to the optical axis Ax. On the other hand, the rear surface 14b of the lens 14 is centered on the optical axis Ax in a state where the cross-sectional shape along the plane including the optical axis Ax is set in a sawtooth shape in the pair of left and right fan-shaped regions 14A1 and 14A2. A plurality of annular zone prisms 14p extending concentrically is formed, and the upper and lower pairs of fan-shaped regions 14B1 and 14B2 are configured by a plane orthogonal to the optical axis Ax.

  At that time, the fan-shaped region 14B1 located below the optical axis Ax is set as an angular range region of the central angle α with reference to a straight line L1 extending vertically downward from the optical axis Ax in the lamp front view, The sector area 14B2 located above the optical axis Ax is set as an angular range area of the central angle β with reference to a straight line L2 extending vertically upward from the optical axis Ax in the lamp front view. In the present embodiment, the central angle α = 60 ° and the central angle β = 60 ° are set.

  This lens 14 reflects light from a predetermined point A on the optical axis Ax located rearward of the lens 14 (specifically, about 30 mm rearward from the rear surface 14b of the lens 14). The pair of left and right fan-shaped regions 14A1 and 14A2 configured as lenses are configured to emit light forward as light parallel to the optical axis Ax.

  FIG. 3 is a detailed view of a main part of FIG.

  As shown in the figure, the light emitting element 12 of the vehicular illumination lamp 10 is a white light emitting diode, and has a light emitting surface 12a having a vertically long rectangular shape. The light emitting surface 12a includes four light emitting chips 12a1, 12a2, 12a3, and 12a4 arranged in series on the substrate 12b. At that time, each of these light emitting chips 12a1, 12a2, 12a3, 12a4 has a light emitting surface of a rectangular shape (specifically, a 1 mm square), and is arranged in a state of being in close contact with each other. Is sealed with a thin film.

  The light emitting element 12 is located at a predetermined point A on the optical axis Ax, with the midpoint in the left-right direction at the upper edge of the light emitting chip 12a1 positioned at the top of the four light emitting chips 12a1, 12a2, 12a3, 12a4. The light emission center (that is, the midpoint in the left-right direction between the second light-emitting chip 12a2 and the third light-emitting chip 12a3) O is vertically below the optical axis Ax. positioned.

  The light emitting element 12 is disposed so as to be movable in the vertical direction with respect to the holder 16 in a state where the light emitting element 12 is fitted in a groove portion 16 a formed in the holder 16 and extending in the vertical direction. The light-emitting element 12 is configured to take a position shown in the figure and a position moved downward from this position by driving an actuator (not shown) (for example, a stepping motor). That is, the light emitting element 12 is configured to change the vertical distance from the light emission center O to the optical axis Ax.

  4 is a partial detailed view of FIG. 2, in which FIG. 4 (a) is a detailed view of the IVa portion of FIG. 2, and FIG. 4 (b) is a detailed view of the IVb portion of FIG.

  As shown in the figure, the right sector region 14A2 configured as a reflective Fresnel lens refracts light from a predetermined point A in a direction away from the optical axis Ax on the inner peripheral surface 14p1 of each annular prism 14p. After being incident on the annular zone prism 14p in such a manner, the incident light is totally reflected forward on the outer peripheral surface 14p2 of the annular zone prism 14p.

  At that time, the light emitted from the light emitting surface 12a of the light emitting element 12 and incident on the arbitrary annular zone prism 14p in the fan-shaped region 14A2 is refracted by the inner peripheral surface 14p1 and then totally reflected by the outer peripheral surface 14p2. Thereafter, the light from the light emitting region located on the right side of the light from the predetermined point A incident on the same point (light in the region indicated by the oblique line extending obliquely in the upper right direction in FIG. 4) is more than the light from the predetermined point A. Is also directed rightward and is emitted forward from the front surface 14a of the lens 14, while light from the light emitting region located on the left side of the light from the predetermined point A (the oblique line extending obliquely in the upper left direction in FIG. 4) The light in the region indicated by (2) is light leftward with respect to the light from the predetermined point A, and is emitted forward from the front surface 14a of the lens 14.

  The same applies to the light incident on the other annular prism 14p. The left sector area 14A1 has the same configuration as the right sector area 14A2.

  FIG. 5 shows a light distribution pattern formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by the irradiation light from the vehicular illumination lamp 10 according to the present embodiment, on the light emitting surface 12 a of the light emitting element 12. It is a figure shown correspondingly with arrangement | positioning.

  A light distribution pattern PA1 shown in FIG. 4D is a light distribution pattern formed when the light emitting surface 12a of the light emitting element 12 is located at the position shown in FIG. The light distribution pattern PA2 is a light distribution pattern formed when the light emitting surface 12a of the light emitting element 12 is at the position shown in FIG. 5B, and the light distribution pattern PA3 shown in FIG. This is a light distribution pattern formed when the light emitting surface 12a of the element 12 is at the position shown in FIG.

  FIGS. 4A to 4C are front views showing the light emitting surface 12a of the light emitting element 12. FIG. 4A shows a state where the upper end edge of the light emitting surface 12a is located on the optical axis Ax. FIG. 4B shows a state in which the light emitting element 12 moves downward and the upper edge of the light emitting surface 12a is at a position 1 mm below the optical axis Ax, and FIG. The element 12 is further moved downward, and the upper end edge of the light emitting surface 12a is in a position 2 mm below the optical axis Ax. At that time, the emission center O of the light emitting element 12 is at a position 2 mm vertically below the optical axis Ax in the state shown in FIG. 5A, and vertically below the optical axis Ax in the state shown in FIG. At the position of 3 mm, in the state shown in FIG. 3C, the position is 4 mm vertically below the optical axis Ax.

  The light distribution pattern PA1 shown in FIG. 4D is slightly larger than 180 ° with HV being the vanishing point in the front direction of the lamp (which is also the intersection of the virtual vertical screen and the optical axis Ax). At the center angle, the lower end edge is formed as a substantially fan-shaped light distribution pattern extending in a substantially horizontal direction. That is, the light distribution pattern PA1 has both lower left and right sides from the position of the VV line that is a vertical line passing through HV slightly below the HH line that is a horizontal line passing through HV. The other part has a substantially circular outer peripheral shape centered on a point located slightly above HV. The light distribution pattern PA1 has a hot zone (that is, a high luminous intensity region) HZ1 formed so as to include HV around a point near the upper side of HV.

  In this light distribution pattern PA1, a plurality of curves formed substantially concentrically with the contour curve are isoluminous curves, and the light distribution pattern PA1 gradually becomes brighter from the outer peripheral edge toward the center. It is shown that. The same applies to the other light distribution patterns described below.

  The light distribution pattern PA2 shown in FIG. 4E is formed as a substantially fan-shaped light distribution pattern that is slightly larger than the light distribution pattern PA1 at substantially the same position as the light distribution pattern PA1. At this time, the light distribution pattern PA2 has a lower end edge slightly below the HH line and slightly downward from the vicinity of the VV line toward the left and right sides in the substantially horizontal direction, like the light distribution pattern PA1. Although extending, a substantially fan-shaped dark portion DZ2 is formed at the central portion in the left-right direction so as to surround HV. And the hot zone HZ2 of this light distribution pattern PA2 is formed in the peripheral part so that the dark part DZ2 may be enclosed.

  The light distribution pattern PA3 shown in FIG. 6F is formed as a substantially fan-shaped light distribution pattern that is slightly larger than the light distribution pattern PA2 at substantially the same position as the light distribution pattern PA2. At this time, the light distribution pattern PA3 has a lower end edge that is slightly downward from the vicinity of the VV line toward the left and right sides in a substantially horizontal direction slightly below the HH line, similarly to the light distribution pattern PA2. A substantially fan-shaped dark portion DZ3 is formed at the central portion in the left-right direction so as to surround HV. However, the dark portion DZ3 is formed as a dark portion larger than the dark portion DZ2 of the light distribution pattern PA2. A pair of hot zones HZ3 of the light distribution pattern PA3 is formed near the left and right sides of the dark portion DZ3.

  A vehicle 2 shown in FIGS. 2E and 2F is a preceding vehicle traveling on the same traveling lane as the host vehicle on the road surface in front of the vehicle.

  When the preceding vehicle 2 does not exist on the road surface in front of the vehicle, the distant area of the road surface in front of the vehicle can be illuminated brightly together with the upper space by adopting the light distribution pattern PA1 shown in FIG.

  On the other hand, when the preceding vehicle 2 is located in a distant area on the road surface ahead of the vehicle, the preceding vehicle 2 can be positioned in the substantially fan-shaped dark portion DZ2 by adopting PA2 shown in FIG. Thus, the surroundings can be illuminated brightly without giving glare to the driver of the preceding vehicle 2.

  Further, when the preceding vehicle 2 is located in a relatively short distance area on the road surface in front of the vehicle, by adopting PA3 shown in FIG. 5 (f), the preceding vehicle is placed in the relatively large fan-shaped dark portion DZ3. 2 can be positioned, so that the surrounding area can be illuminated brightly over a relatively wide range without giving glare to the driver of the preceding vehicle 2.

  FIG. 6 is a diagram showing the three light distribution patterns PA1, PA2, and PA3 shown in FIG. 5 as a result of a ray tracing simulation.

  As shown in the figure, each of these three light distribution patterns PA1, PA2, and PA3 is formed as a light distribution pattern constituting the center of the high beam light distribution pattern PH indicated by a two-dot chain line. Yes.

  FIG. 7 is a diagram for explaining the formation of the light distribution pattern PA1 formed by the irradiation light from the vehicular illumination lamp 10 according to the present embodiment.

  FIG. 4A is a front view showing the light emitting surface 12a of the light emitting element 12 in a state where the reflective Fresnel lens 14o is equally divided into 12 sectors S1 to S12 with the optical axis Ax as the center. At this time, the reflective Fresnel lens 14o has a configuration in which a plurality of annular prisms 14p formed in each of the fan-shaped regions 14A1 and 14A2 of the lens 14 are formed over the entire circumference with the optical axis Ax as the center. Yes.

  FIG. 6B shows the 12 light distribution patterns formed by the light emitted from each of the 12 sectors S1 to S12 in the reflection type Fresnel lens 14o. It is a figure shown with the elements P1-P12, Comprising: It is the figure obtained as a result of having performed the simulation of ray tracing.

  As shown in FIG. 5B, as the positions of the sectors S1 to S12 change, the light distribution pattern elements P1 to P12 change their shapes and their positions around HV. It is formed so as to rotate twice around HV while gradually changing. At that time, the six light distribution pattern elements P1 to P6 on the left side are formed in a symmetrical relationship with the six light distribution pattern elements P7 to P12 on the right side. This is because the light emission center O of the light emitting element 12 is located vertically below the optical axis Ax.

  All of these light distribution pattern elements P1 to P12 are formed in a substantially wedge shape, and the tip portion thereof is formed so as to hang on HV, and the tip portion has the highest luminous intensity.

  Of these light distribution pattern elements P1 to P12, the light distribution pattern elements P1 and P12 formed by the light emitted from the two sectors S1 and S12 positioned almost directly above the optical axis Ax and the optical axis Ax. The light distribution pattern elements P6 and P7 formed by the light emitted from the two sectors S6 and S7 located directly below are formed so as to expand downward from HV. On the other hand, the light distribution pattern elements P3 and P4 formed by the light emitted from the two sectors S3 and S4 positioned in the right direction of the optical axis Ax (leftward in the front view of the lamp) are positioned in the left direction of the optical axis Ax. The light distribution pattern elements P9 and P10 formed by the light emitted from the two sectors S9 and S10 are formed so as to expand from HV to the upper side. At this time, the extent of the light distribution pattern elements P3, P4, P9, and P10 spreading upward from the HV is the extent of the light distribution pattern elements P1, P6, P7, and P12 spreading downward from the HV. It is bigger than the degree.

  Of the remaining four light distribution pattern elements P2, P5, P8, and P11, light distribution pattern elements P2 and P8 formed by light emitted from two sectors P2 and P8 located at the upper right and lower left of the optical axis Ax are: Light distribution pattern elements P11 and P5 formed by light emitted from the two sectors P11 and P5 located at the upper left and lower right of the optical axis Ax are formed so as to extend from HV to the left and slightly upward. , HV is formed so as to expand slightly to the right. At this time, the extent of the light distribution pattern elements P2, P5, P8, and P11 from HV is larger than the extent of the light distribution pattern elements P1, P6, P7, and P12 from HV to the lower side. The light distribution pattern elements P3, P4, P9, and P10 are smaller than the extent of spreading upward from HV. Further, these light distribution pattern elements P2, P5, P8, and P11 have their lower end edges extending in a substantially horizontal direction slightly below the HH line.

  A light distribution pattern PAo is formed as a light distribution pattern in which these twelve light distribution pattern elements P1 to P12 are superimposed. This light distribution pattern PAo is formed as a substantially circular light distribution pattern centered on a point located slightly above HV, and its MAX luminous intensity position is located in the vicinity of HV. It has a luminous intensity distribution that proportionally distributes the luminous intensity position and the outer shape.

  The lens 14 of the vehicular illumination lamp 10 according to the present embodiment is positioned substantially directly below the two sectors S1 and S12 and the optical axis Ax, which are positioned directly above the optical axis Ax, with respect to the reflective Fresnel lens 14o. Since the two sectors S6 and S7 are configured as through lenses, the light distribution pattern elements P1, P6, P7 and P12 cannot be obtained. That is, the light distribution pattern PA1 formed by the irradiation light from the vehicular illumination lamp 10 according to the present embodiment lacks the light distribution pattern elements P1, P6, P7, and P12 with respect to the light distribution pattern PAo. Thus, as shown in FIG. 5 (d) or FIG. 6 (d), a substantially fan-shaped lower end edge extending in a substantially horizontal direction with a central angle slightly larger than 180 [deg.] Centered on HV. The light distribution pattern has an outer shape and has a light intensity distribution that gradually becomes darker from the vicinity of HV toward the periphery.

  The light distribution pattern PA1 is formed in a state where the upper end edge of the light emitting surface 12a is positioned on the optical axis Ax, and constitutes this when the upper end edge of the light emitting surface 12a is separated downward from the optical axis Ax. The light distribution pattern elements P2 to P5 and P8 to P11 are displaced in a direction away from HV, and their tip portions are separated from HV, so that they are slightly larger than the light distribution pattern PA1 as in the light distribution pattern PA2. It is formed as a substantially fan-shaped light distribution pattern, and has a substantially fan-shaped dark portion DZ2 surrounding HV. And if the upper end edge of the light emission surface 12a leaves | separates further downward from the optical axis Ax, the light distribution pattern elements P2-P5 and P8-P11 which comprise this will displace to the direction further away from HV, and the tip part Is further separated from the HV, so that it is formed as a substantially fan-shaped light distribution pattern that is slightly larger than the light distribution pattern PA2 like the light distribution pattern PA3, and the substantially fan-shaped dark portion DZ3 surrounding the HV is also large. Become.

  As described above in detail, the vehicular illumination lamp 10 according to the present embodiment uses the lens 14 disposed on the front side of the light from the light emitting element 12 disposed in the vicinity of the optical axis Ax extending in the lamp front-rear direction. Therefore, the pair of left and right fan-shaped areas 14A1 and 14A2 of the lens 14 is configured as a reflection type Fresnel lens, and the other pair of upper and lower fan-shaped areas 14B1. , 14B2 is configured as a through lens, the front and rear length of the lamp can be shortened, and this can be configured compactly.

  Moreover, the pair of left and right fan-shaped regions 14A1 and 14A2 configured as the reflection type Fresnel lenses are configured to transmit light from a predetermined point A on the optical axis Ax located on the rear side thereof to the inner periphery of each annular prism 14p. After the light is incident on the ring-shaped prism 14p so as to be refracted in the direction away from the optical axis Ax on the surface 14p1, the incident light is totally reflected forward on the outer peripheral surface 14p2 of the ring-shaped prism 14p. Therefore, if the light emission center O of the light emitting element 12 is located on the optical axis Ax and the reflection type Fresnel lens is formed over the entire circumference, the light emission of the light emitting element 12 is caused by the optical action. The image of the surface 12a is formed over the entire circumference around HV on the virtual vertical screen disposed in front of the lamp.

  In that respect, in the vehicular illumination lamp 10 according to the present embodiment, the light emitting element 12 is arranged so that the light emission center O is shifted vertically downward from the optical axis Ax, and the light emission in the front view of the lamp is performed. When the angle between the straight line connecting the light emission center O of the element 12 and the optical axis Ax and the straight line extending vertically downward from the optical axis Ax is θ (that is, θ = 0 °), the optical axis Ax to θ in the lens 14 An angle range region (that is, sector region 14B1) having a central angle α (= 60 °) and a direction θ / 2 + 180 ° from the optical axis (that is, vertically upward) with reference to a straight line L1 extending in the direction / 2 (that is, vertically downward). An angle range region (that is, the sector region 14B2) having a central angle β (= 60 °) with respect to the straight line L2 extending in the direction is configured as a through lens (that is, configured as a reflective Fresnel lens). Therefore, on the virtual vertical screen, a substantially fan-shaped light distribution pattern in which the lower end edge extends in a substantially horizontal direction with a center angle slightly larger than 180 ° about the HV point as a center. PA1 (or light distribution pattern PA2, PA3) can be formed. Therefore, the light distribution pattern PA1 (or the light distribution patterns PA2 and PA3) can be a light distribution pattern that irradiates far away without irradiating the road surface ahead of the vehicle more than necessary.

  As described above, according to the present embodiment, in the vehicular illumination lamp 10 using the light emitting element 12 as a light source, the light distribution suitable for the configuration of the central portion of the high beam light distribution pattern PH after having a compact configuration. A pattern PA1 (or a light distribution pattern PA2, PA3) can be formed.

  In the vehicular illumination lamp 10 according to the present embodiment, if the shift amount vertically downward from the optical axis Ax of the light emission center O of the light emitting element 12 is set to a small value, the central portion of the substantially fan-shaped light distribution pattern PA1 is set. On the other hand, if the shift amount is set to a large value, a substantially fan-shaped dark portion DZ2 is formed at the center of the substantially fan-shaped light distribution pattern PA2, and the peripheral portion of the dark portion DZ2 is lightened. If the shift amount is set to a larger value, a substantially fan-shaped dark portion DZ3 can be formed at the center of the substantially fan-shaped light distribution pattern PA3, and the peripheral portion of the dark portion DZ3 can be brightened. . And thereby, the surroundings are brightly irradiated without giving glare to the driver of the preceding vehicle 2 according to the presence or absence of the preceding vehicle 2 and according to the traveling position of the preceding vehicle 2. Is possible.

  In particular, the vehicular illumination lamp 10 according to the present embodiment is configured so that the distance from the light emission center O to the optical axis Ax can be changed by moving the light emitting element 12 vertically downward. Depending on the driving conditions, a light distribution pattern PA1 having a bright hot zone HZ1 at the center, a light distribution pattern PA2 having a relatively small dark part DZ2 at the center, or a relatively large dark part at the center A light distribution pattern PA3 having DZ3 can be formed.

  Further, the vehicular illumination lamp 10 according to the present embodiment has a configuration in which the light emitting surface 12a does not overlap with the optical axis Ax when viewed from the front of the lamp, even when the light emission center O of the light emitting element 12 is closest to the optical axis Ax. Therefore, even the substantially fan-shaped light distribution pattern PA1 formed at this time can be formed such that the center portion of the light distribution pattern PA1 does not protrude downward from the lower end edge of the light distribution pattern PA1. As a result, it is possible to reliably prevent the road surface in front of the vehicle from being illuminated more brightly than necessary.

  In the said embodiment, although demonstrated that each light emitting chip 12a1, 12a2, 12a3, 12a4 of the light emitting element 12 had a square light emission surface, what has a light emission surface of shapes other than this is used. But of course it is possible.

  In the above embodiment, the center angles α and β of the pair of fan-shaped regions 14B1 and 14B2 configured as the through lenses have been described as being 60 °, but within an angle range of 45 to 90 °. If it is, the effect similar to the said embodiment can be acquired. At that time, if the central angles α and β are made smaller than 60 °, the central angles of the substantially fan-shaped light distribution patterns PA1, PA2 and PA3 are increased, and the downward inclination angle toward the left and right sides of the lower end edge is increased. On the other hand, when the central angles α and β are larger than 60 °, the central angles of the substantially fan-shaped light distribution patterns PA1, PA2, and PA3 are decreased, and the downward inclination angles toward the left and right sides of the lower end edge are decreased. .

  Furthermore, in the above embodiment, the light emitting element 12 has been described as having a configuration in which the vertical distance from the light emission center O to the optical axis Ax is changed by moving vertically downward. It is also possible to employ a configuration as shown in the modification.

  FIG. 8 is a view similar to FIG. 5, showing the main part of the vehicular illumination lamp according to the first modification of the embodiment together with its operation.

  As shown in FIGS. 9A to 9C, in the present modification, the light emitting element 12 is not configured to move vertically downward as in the case of the above embodiment, and the light emitting surface 12a The area changes.

  That is, the light-emitting element 12 of this modification example has a mode in which all of the four light-emitting chips 12a1, 12a2, 12a3, and 12a4 emit light, as shown in FIG. A mode in which the three light emitting chips 12a2, 12a3, 12a4 except the upper light emitting chip 12a1 emit light and a mode in which the two lower light emitting chips 12a3, 12a4 emit light as shown in FIG. It is like that.

  Thus, the light emitting element 12 is configured to change the vertical distance from the light emission center O to the optical axis Ax. That is, at the position shown in FIG. 5A, the light emission center O is located at the middle point in the left-right direction between the second light emitting chip 12a2 and the third light emitting chip 12a3 from the top. ), The light emission center O is located at the center of the third light emitting chip 12a3 from the top. At the position shown in FIG. 5C, the third light emitting chip 12a3 and the fourth light emitting chip from the top. The light emission center O is located at the middle point in the left-right direction between 12a4.

  A light distribution pattern PB1 shown in FIG. 4D is a light distribution pattern formed when the light emitting surface 12a of the light emitting element 12 is in the light emitting state shown in FIG.

  This light distribution pattern PB1 is the same light distribution pattern as the light distribution pattern PA1 of the above embodiment.

  A light distribution pattern PB2 shown in FIG. 5E is a light distribution pattern formed when the light emitting surface 12a of the light emitting element 12 is in the light emitting state shown in FIG.

  Similar to the light distribution pattern PB1, the light distribution pattern PB2 is formed as a substantially fan-shaped light distribution pattern having a central angle slightly larger than 180 ° with the center at HV and a lower end edge extending in a substantially horizontal direction. Yes.

  However, a substantially fan-shaped dark part DZ2 is formed so as to surround HV at the center in the left-right direction of the lower edge of the light distribution pattern PB2. This is because the upper edge of the light emitting surface 12a is displaced slightly downward from the optical axis Ax.

  The light distribution pattern PB2 is a light distribution pattern that is slightly darker overall than the light distribution pattern PB1. This is because the light distribution pattern PB1 is formed by light emission of the four light emitting chips 12a1, 12a2, 12a3, and 12a4, whereas the light distribution pattern PB2 is formed by light emission of the three light emitting chips 12a2, 12a3, and 12a4. Is due to

  A light distribution pattern PB3 shown in FIG. 5F is a light distribution pattern formed when the light emitting surface 12a of the light emitting element 12 is in the light emitting state shown in FIG.

  Similar to the light distribution pattern PB2, the light distribution pattern PB3 is formed as a substantially fan-shaped light distribution pattern having a central angle slightly larger than 180 ° with the center at HV and a lower end edge extending in a substantially horizontal direction. In addition, a substantially fan-shaped dark portion DZ3 is formed at the central portion of the lower end edge in the left-right direction so as to surround HV.

  However, the light distribution pattern PB3 has a dark portion DZ3 whose shape is larger than the dark portion DZ2 of the light distribution pattern PB2, and is a light distribution pattern that is slightly darker overall than the light distribution pattern PB2. Yes. This is because the upper end edge of the light emitting surface 12a is displaced further downward from the optical axis Ax, and the light distribution pattern PB3 is formed by light emission of the two light emitting chips 12a3 and 12a4.

  By adopting the configuration of this modification, it is possible to obtain substantially the same operational effects as in the case of the above embodiment.

  At this time, in the present modification, the brightness of the light distribution patterns PB2 and PB3 is darker than that of the light distribution patterns PA2 and PA3 of the above embodiment, but an actuator for moving the light emitting element 12 in the vertical direction. The above-described effects can be obtained without using a lamp, thereby simplifying the configuration of the lamp.

  In the above embodiment, the light emission center O of the light emitting element 12 has been described as being positioned vertically below the optical axis Ax. However, a configuration as shown in the following second modification may be employed. Is possible.

  FIG. 9 is a front view showing a vehicular illumination lamp 210 according to a second modification of the embodiment.

  As shown in the figure, the basic configuration of the vehicular illumination lamp 210 according to this modification is the same as that of the vehicular illumination lamp 10 according to the above embodiment, but the light emitting element 12 and the holder 16 are the same as those in the above embodiment. With respect to the case of the embodiment, the lens 14 is disposed in a state of being rotated 90 ° clockwise (counterclockwise in the front view of the lamp), and the lens 14 is 45 clockwise relative to the case of the above embodiment. ° Arranged in a rotated state.

  Thereby, the light emitting element 12 of this modification has the light emission center O located on the left side of the optical axis Ax, and the light emission center O is moved to the left side from the position shown in the figure. It is the composition which can take.

  Further, in the lens 14 of this modification, a pair of fan-shaped regions 14B1 and 14B2 configured as through lenses are formed in the same shape at a position rotated 45 ° clockwise relative to the case of the above embodiment. It has a configuration.

  That is, the fan-shaped region 14B1 located obliquely below and to the left of the optical axis Ax is a straight line connecting the light emission center O of the light emitting element 12 and the optical axis Ax (that is, a straight line extending horizontally from the optical axis Ax to the left) in the front view of the lamp. ) Is a line extending vertically downward from the optical axis Ax is θ (ie, θ = 90 °), the lens 14 has a direction from the optical axis Ax to θ / 2 (ie, diagonally downward to the left from the optical axis Ax). 45 ° direction) is set as an angle range region with a central angle α (where α = 60 °) with reference to a straight line L3, and on the other hand, a sector region 14B2 located obliquely above and to the right of the optical axis Ax is Angle range of central angle β (where β = 60 °) with reference to a straight line L4 extending in the direction θ / 2 + 180 ° from the optical axis Ax (that is, 45 ° diagonally upward from the optical axis Ax) in front view of the lamp Set as region Has been.

  FIG. 10 is a view similar to FIG. 5, showing a main part of the vehicular illumination lamp 210 according to the present modification together with its operation.

  As shown in FIG. 5A, when the light emitting element 12 is arranged so that the right end edge of the light emitting surface 12a is positioned on the optical axis Ax, the light distribution pattern PC1 shown in FIG. It is formed.

  Similar to the light distribution pattern PA1 of the above embodiment, the light distribution pattern PC1 is formed as a substantially fan-shaped light distribution pattern having a central angle slightly larger than 180 ° and a lower end edge extending in a substantially horizontal direction. However, the hot zone HZ1 of the light distribution pattern PC1 is located in the vicinity of the left side of the VV line, and its outer shape is formed around a point located slightly to the right of the HV. .

  As shown in FIG. 5B, when the light emitting element 12 moves to the left and the right edge of the light emitting surface 12a is located 1 mm to the left of the optical axis Ax, the arrangement shown in FIG. An optical pattern PC2 is formed.

  The light distribution pattern PC2 is formed as a substantially fan-shaped light distribution pattern that is slightly larger than the light distribution pattern PC1 at substantially the same position as the light distribution pattern PC1. At this time, similar to the light distribution pattern PC1, the lower end edge of the light distribution pattern PC2 is slightly downward from the vicinity of the VV line toward the left and right sides in the substantially horizontal direction slightly below the HH line. Although extending, a substantially fan-shaped dark portion DZ2 is formed at the central portion in the left-right direction so as to surround HV. And the hot zone HZ2 of this light distribution pattern PC2 is formed in the peripheral part so that the dark part DZ2 may be enclosed.

  As shown in FIG. 6C, when the light emitting element 12 further moves leftward and the right edge of the light emitting surface 12a is at a position 2 mm to the left of the optical axis Ax, the light emitting element 12 is shown in FIG. A light distribution pattern PC3 is formed.

  The light distribution pattern PC3 is formed as a substantially fan-shaped light distribution pattern that is slightly larger than the light distribution pattern PC2 at substantially the same position as the light distribution pattern PC2. At this time, similar to the light distribution pattern PC2, the lower end edge of the light distribution pattern PC3 is slightly below the HH line and slightly downward from the vicinity of the VV line toward the left and right sides, in a substantially horizontal direction. A substantially fan-shaped dark portion DZ3 is formed at the central portion in the left-right direction so as to surround HV. However, the dark portion DZ3 is formed as a dark portion larger than the dark portion DZ2 of the light distribution pattern PC2. The hot zone HZ3 of the light distribution pattern PC3 is formed so as to surround the dark part DZ3 to the left.

  FIG. 11 is a diagram for explaining the formation of the light distribution pattern PC1 formed by the irradiation light from the vehicular illumination lamp 210 according to the present modification.

  FIG. 4A is a front view showing the light emitting surface 12a of the light emitting element 12 in a state where the reflective Fresnel lens 14o is equally divided into 12 sectors S1 to S12 with the optical axis Ax as the center. At this time, the reflective Fresnel lens 14o has a configuration in which a plurality of annular prisms 14p formed in each of the fan-shaped regions 14A1 and 14A2 of the lens 14 are formed over the entire circumference with the optical axis Ax as the center. Yes.

  FIG. 6B shows a light distribution pattern PCo that is the basis of the light distribution pattern PC1, and 12 light distribution patterns formed by light emitted from each of the 12 sectors S1 to S12 in the reflective Fresnel lens 14o. It is a figure shown with the elements P1-P12, Comprising: It is the figure obtained as a result of having performed the simulation of ray tracing.

  The light distribution pattern elements P1 to P12 shown in FIG. 7B are obtained by rotating the light distribution pattern elements P4 to P12 and P1 to P3 shown in FIG. 7 by 90 degrees clockwise around HV. It has become. This is because, in the above embodiment, the light emission center O of the light emitting element 12 is positioned vertically below the optical axis Ax, whereas in the present modification, the light emission center O of the light emitting element 12 is of the optical axis Ax. This is because it is located on the left side. The light distribution pattern PCo formed as a light distribution pattern in which these twelve light distribution pattern elements P1 to P12 are superimposed also is obtained by rotating the light distribution pattern PAo shown in FIG. 7 clockwise around HV. It is rotated 90 °.

  The lens 14 of the vehicular illumination lamp 210 according to the present modification includes a sector S2 located obliquely above and to the right of the optical axis Ax with respect to the reflective Fresnel lens 14o, and half of the sectors S1 and S3 located on both sides of the sector S2. Since the sector S8 located obliquely below the axis Ax and half of the sectors S7 and S9 located on both sides thereof are configured as through lenses, the light distribution pattern element P2 and half of the light distribution pattern elements P1 and P3 as well as the distribution are arranged. Half of the light pattern element P8 and the light distribution pattern elements P7 and P9 cannot be obtained.

  That is, the light distribution pattern PC1 formed by the irradiation light from the vehicular illumination lamp 210 according to the present modification is half of the light distribution pattern element P2 and the light distribution pattern elements P1 and P3 with respect to the light distribution pattern PCo. Half of the light distribution pattern element P8 and the light distribution pattern elements P7 and P9 are missing. As a result, as shown in FIG. 10 (d), the lower end edge is substantially horizontal with a center angle slightly larger than 180 °. The hot zone HZ1 is formed in the vicinity of the left side of the VV line, and the outer shape thereof is formed at a point located slightly on the right side of the HV. It will be.

  The light distribution pattern PC1 is formed in a state where the right end edge of the light emitting surface 12a is positioned on the optical axis Ax. The light distribution pattern PC1 is configured when the right end edge of the light emitting surface 12a is separated from the optical axis Ax to the left. The light distribution pattern elements P4 to P6, P10 to P12 and half of the light distribution pattern elements P1, P3, P7, and P9 are displaced in a direction away from HV, and the pointed portions thereof are separated from HV. Like the light distribution pattern PC2, the light distribution pattern is formed as a substantially fan-shaped light distribution pattern that is slightly larger than the light distribution pattern PC1, and has a substantially fan-shaped dark portion DZ2 surrounding HV. When the right end edge of the light emitting surface 12a is further leftward from the optical axis Ax, the light distribution pattern elements P4 to P6, P10 to P12 and the light distribution pattern elements P1, P3, P7, and P9 constituting the light emitting surface 12a are half. Is displaced further away from HV, and its tip is further away from HV, so that it is formed as a substantially fan-shaped light distribution pattern that is a little larger than light distribution pattern PC2 like light distribution pattern PC3. Thus, the substantially fan-shaped dark part DZ3 is formed larger than the dark part DZ2.

  By adopting the configuration of this modification, it is possible to obtain substantially the same operational effects as in the case of the above embodiment.

  At that time, the light distribution patterns PC1, PC2, and PC3 formed in the present modification have a symmetrical shape with respect to the VV line, like the light distribution patterns PA1, PA2, and PA3 formed in the above embodiment. Although it does not become a light pattern, it has a light intensity distribution substantially the same as these light distribution patterns PA1, PA2, and PA3.

  Note that the vehicular illumination lamp 210 according to the present modification is provided with a pair of left and right vehicles at the front end of the vehicle together with the headlamp unit. As a result, a pair of light distribution patterns PC1, PC2, and PC3 can be formed symmetrically. Then, by combining the left and right symmetrical light distribution patterns PC1, PC2, and PC3 formed by the irradiation light from the pair of left and right vehicle illumination lamps 210, the left and right symmetrical light distribution patterns with respect to the VV line are combined. Can be formed respectively.

  In the above embodiment and each modified example, the case where the value of the angle θ is θ = 0 ° and θ = 90 ° has been described, but even when other angles are set, the pair of sector regions 14B1, 14B2 is set to an angle range region having a central angle of 45 to 90 ° with respect to each of a straight line extending in the direction of θ / 2 and a straight line extending in the direction of θ / 2 + 180 °. Similarly, a substantially fan-shaped light distribution pattern having a central angle slightly larger than 180 ° and a lower end edge extending in a substantially horizontal direction can be formed.

  In addition, the numerical value shown as a specification in the said embodiment and each modification is only an example, and of course, you may set these to a different value suitably.

Front view showing a vehicular illumination lamp according to an embodiment of the present invention II-II sectional view of FIG. Detailed view of the main part of FIG. 2A is a partial detailed view of FIG. 2, in which FIG. 2A is a detailed view of a portion IVa of FIG. 2, and FIG. The figure which shows the light distribution pattern formed on the virtual vertical screen arrange | positioned in the position of 25 m ahead of a lamp | ramp by the irradiated light from the said vehicle lighting lamp corresponding to arrangement | positioning of the light emission surface of a light emitting element, and is shown transparently. The figure which shows the three light distribution patterns shown in FIG. 5 as a result of having performed the ray tracing simulation. The figure for demonstrating formation of the light distribution pattern formed with the irradiation light from the said vehicle lighting device The figure similar to FIG. 5 which shows the principal part of the vehicle lighting device which concerns on the 1st modification of the said embodiment with the effect | action. The front view which shows the vehicle lighting device which concerns on the 2nd modification of the said embodiment. The same figure as FIG. 5 which shows the principal part of the illumination lamp for vehicles which concerns on the said 2nd modification with the effect | action. The figure for demonstrating the origin of the light distribution pattern formed with the irradiation light from the vehicle lighting lamp which concerns on the said 2nd modification.

Explanation of symbols

2 Front-running vehicles 10, 210 Vehicle lamps 12 Light-emitting elements 12a Light-emitting surfaces 12a1, 12a2, 12a3, 12a4 Light-emitting chips 12b Substrate 14 Lens 14A1, 14A2 Fan-shaped region (region configured as a reflective Fresnel lens)
14B1, 14B2 Fan-shaped area (area not configured as a reflective Fresnel lens (area configured as a through lens))
14a Front side surface 14b Rear side surface 14o Reflective Fresnel lens 14p Ring-shaped prism 14p1 Inner peripheral surface 14p2 Outer peripheral surface 16 Holder 16a Groove A Predetermined point Ax Optical axis DZ2, DZ3 Dark part HZ1, HZ2, HZ3 Hot zone L1, L2, L2 , L4 Straight line O Light emission center PAo, PCo Original light distribution pattern PA1, PA2, PA3, PB1, PB2, PB3, PC1, PC2, PC3 Light distribution pattern of a PH High beam light distribution pattern P1 to P12 Light distribution pattern Element S1 to S12 Sector α, β Center angle

Claims (3)

A vehicle comprising: a light emitting element disposed in the vicinity of an optical axis extending in the front-rear direction of the lamp; and a lens disposed in front of the light emitting element and deflecting and emitting light from the light emitting element forward. In lighting fixtures,
The light emitting element is disposed so as to shift the light emission center of the light emitting element from the optical axis,
The lens is formed with a plurality of annular prisms extending concentrically around the optical axis in a state where a cross-sectional shape along a plane including the optical axis is set in a sawtooth shape on a rear surface of the lens. It is configured as a Fresnel lens that emits light from a predetermined point on the optical axis located on the rear side of the lens toward the front as light parallel to the optical axis,
The Fresnel lens causes the light from the predetermined point to enter the annular prism in a manner that refracts the light from the optical axis on the inner peripheral surface of each annular prism, and then causes the incident light to enter the annular prism. It is configured as a reflective Fresnel lens that totally reflects forward on the outer peripheral surface of the belt-like prism,
When the angle between a straight line connecting the light emission center of the light emitting element and the optical axis and a straight line extending vertically downward from the optical axis is θ / 2 in the front view of the lamp, θ / 2 from the optical axis in the lens. An angle range region having a central angle of 45 to 90 ° with respect to a straight line extending in the direction of the angle, and an angle range region having a central angle of 45 to 90 ° with respect to a straight line extending in the direction of θ / 2 + 180 ° from the optical axis. A vehicular illumination lamp characterized by being set as a region not configured as a reflective Fresnel lens.   2. The vehicular illumination lamp according to claim 1, wherein a distance from the light emission center of the light emitting element to the optical axis can be changed.   3. The vehicular illumination lamp according to claim 1, wherein the light emitting element is disposed so that a light emitting surface of the light emitting element does not overlap the optical axis in a front view of the lamp.

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