JP7053356B2 - Vehicle headlights - Google Patents

Description

The present invention relates to a vehicle headlight that forms a light distribution pattern by reflecting halogen bulb light having both low beam and high beam filaments with a reflector.

Patent Document 1 includes a low beam filament with an inner shade and a high beam filament, respectively, and reflects the light of one of the filaments that are selectively lit forward by a reflector for a low beam light distribution pattern or a high beam. Halogen headlights that form a light distribution pattern are disclosed.

The halogen headlight of Patent Document 1 has a low beam forming region of a reflector (horizontal cut formed following the cut-offline light) of the light of a low beam filament forming a cutoff line that descends horizontally and diagonally through an inner shade. A low beam light distribution pattern is formed by inverting and reflecting downward at the offline forming end and the diagonally descending diagonal cut offline forming end (the region above the offline forming end), and the light of the high beam filament is reflected in the entire region of the reflector (low beam forming region). And the area dedicated to high beam formation, which is the remaining area of the reflector), to form a high beam light distribution pattern.

Japanese Unexamined Patent Publication No. 2001-57103

In recent years, many vehicle headlights use an LED element that consumes less power than a halogen bulb as a light source. From the viewpoint of design using small size, reflectors with shorter width and height than halogen headlights are often used. On the other hand, even in a headlight designed to have a small reflector on the premise of adopting an LED light source, not only an LED light source but also a halogen bulb may be adopted from the viewpoint of grading the vehicle.

A reflector designed to have a narrow occupied area on the premise of adopting an LED light source has a smaller area dedicated to forming a high beam than a conventional reflector for a halogen bulb as shown in Patent Document 1. In particular, some inner shades of high-efficiency light source bulbs in recent years form cut-off-off light having a cut-off line that tilts diagonally downward on both the left and right sides instead of a cut-off line that tilts horizontally and diagonally downward. Therefore, the area dedicated to the high beam formation of the reflector is further increased by forming the cut-off line forming end that determines the low beam forming region diagonally downward from the conventional horizontal direction based on the adoption of such a high-efficiency light source bulb. It is narrowed down.

Such a decrease in the area dedicated to the formation of the high beam may cause a lack of light intensity in the hot zone due to a decrease in light collection property.

In view of the above problems, this application is for vehicles that can form a high beam light distribution pattern with a hot zone of sufficient luminous intensity even if a high-efficiency halogen bulb is used for a reflector with a small occupied area assuming an LED light source. It provides a light source.

A reflector having a reflecting surface composed of a low beam forming region and a high beam forming dedicated region, and a first light emitting portion that irradiates the low beam forming region of the reflector with the first light via a light-shielding member to form a low beam light distribution pattern forward. , The second light emitting unit that is lit and emitted by selection with the first light emitting unit is irradiated to both the low beam forming region and the high beam forming dedicated region of the reflector to form a high beam light distribution pattern in front. In a vehicle headlight having a light source provided with the headlight, the low beam forming region of the reflector reflects the auxiliary light distribution to the high beam hot zone formed when irradiating the reflected light of the high beam forming dedicated region. It is desirable that it be formed to have a region.

(Action) The auxiliary condensing region provided in the low beam forming region of the reflector forms a part of the low beam light distribution pattern when the first light emitting portion is turned on and the second light emitting portion is turned off, and the second light emitting portion is turned on. Moreover, when the first light emitting unit is turned off, the reflected light from the high beam forming dedicated region is supplemented to increase the luminous flux in the high beam hot zone.

Further, in a vehicle headlight, the reflector is composed of a plurality of reflection segments, and an auxiliary condensing region of the low beam forming region condenses a part of the second light toward the high beam hot zone. It is also desirable to form it as an auxiliary light collection segment.

(Action) The auxiliary condensing region of the low beam forming region of the reflector forms a part of the low beam light distribution pattern when the first light emitting portion is lit, and supplements the reflected light by the high beam forming dedicated region when the second light emitting portion is lit. Light to increase the luminous flux in the high beam hot zone.

Further, in the headlight for a vehicle, it is also desirable that the auxiliary condensing region is formed in the vicinity of the outer periphery of the low beam forming region of the reflector.

(Action) The reflected light emitted from the region near the outer circumference of the reflector has a high luminous intensity and forms a small optical image.

Further, in the vehicle headlight, it is also desirable that the auxiliary condensing region is formed so as to irradiate a part of the second light to the region having the maximum luminous intensity of the high beam light distribution pattern.

(Action) By irradiating the region where the condensing region of the low beam forming region of the reflector has the maximum luminous intensity of the high beam light distribution pattern with auxiliary condensing, the luminous intensity of the region that should be the maximum luminous intensity in the hot zone is increased. To.

According to the vehicle headlights, the auxiliary condensing region provided in the low beam forming region of the reflector not only contributes to the formation of the low beam light distribution pattern when the first light emitting unit is lit, but also the second light emitting unit. By supplementing the reflected light from the high beam formation dedicated region at the time of lighting and contributing to the increase in the light beam of the high beam hot zone, a high beam light distribution pattern having a sufficient maximum light intensity is formed.

According to the vehicle headlight, by forming the auxiliary light-collecting region in the region near the outer periphery of the reflector, the light-condensing degree of the reflected light is increased and the luminous flux density is increased, so that the luminous intensity of the hot zone is further improved.

According to the vehicle headlights, the auxiliary focusing region provided in the low beam forming region of the reflector maximizes the luminous intensity of the region that should be the maximum luminous intensity in the high beam hot zone, so that the light distribution pattern for the high beam is arranged. Maximum distant growth.

The vertical sectional view of the headlight for a vehicle which concerns on embodiment of this invention. (A) Left side view of the light source bulb of this embodiment. (B) An enlarged plan view of the area around the inner shade of the light source bulb as viewed from above. (C) Cross-sectional view taken along the line II of FIG. 2 (b). Front view of the reflector of this embodiment. The figure which shows the state which seen the light distribution pattern for a low beam by the headlight for a vehicle of this embodiment perspective from the rear of a reflector. The figure which shows the state which seen the light distribution pattern for a high beam by the headlight for a vehicle of this embodiment perspective from the rear of a reflector. Explanatory drawing which looked at the light distribution pattern for a high beam by the headlight for a vehicle of this embodiment from the upper side of a vehicle.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 5. In each figure, the direction of the road as seen from each part of the vehicle headlights and the driver of the vehicle equipped with the vehicle headlights (upper: lower: left: right: front: rear = Up: Lo: Le). : Ri: Fr: Re).

The vehicle headlight 1 in the present embodiment will be described with reference to FIG. The present embodiment shows a two-lamp type vehicle headlight 1 that selectively emits low beam light or high beam light by switching the light emitting filaments (8, 10). The vehicle headlight 1 is formed by providing a lamp unit 4 and an extension reflector 11 in a lamp chamber S formed inside a lamp body 2 and a transparent or translucent front lens 3. In this embodiment, as shown in FIG. 6, which will be described later, it is assumed that the vehicle 24 equipped with the vehicle headlights is used in a country with left-hand traffic.

The lamp unit 4 is composed of a light source bulb 5, a reflector 6, and an outer shade 7. The light source valve 5 is a high-efficiency light emitting bulb such as a halogen bulb having a low beam filament 8 (first light emitting unit) extending in the optical axis O direction, an inner shade 9 and a high beam filament 10 (second light emitting unit). The light source valve 5 is attached to a reflector 6 formed by providing a plurality of reflection segments to be described later on a rotating paraboloid centered on the optical axis O so as to be coaxial with the optical axis O and when the low beam is lit. The filament 8 is turned on, and the filament 10 is turned on when the high beam is turned on. The reflector 6 reflects the light of the light source bulb 5 forward by a reflection segment provided on the reflection surface 6a, which will be described later. The outer shade 7 is composed of a cap 7a that covers the front end portion of the light source bulb 5 and a mounting portion 7b that is attached to the reflector 6 so as to shield the light directly emitted forward from the low beam filament 8. The peripheral area of the lamp unit 4 in the lamp chamber S is shielded by the extension reflector 11 so as not to be seen from the front.

FIG. 2A shows the light source bulb 5 of FIG. The light source bulb 5 includes a base 5a, a tubular glass ball 5b fixed to the base, a terminal 5c, a metal lead wire 5d electrically connected to the terminal 5c via the base 5a, a low beam filament 8, and a light-shielding member. It has an inner shade 9 and a filament 10 for a high beam. The low beam filament 8, the inner shade 9, and the high beam filament 10 are each held by the base 5a via the lead wire 5d inside the tubular glass sphere 5b in which gas is sealed and sealed.

The low beam filament 8 is arranged coaxially with the optical axis O, the inner shade 9 is arranged below the low beam filament 8, and the high beam filament 10 is behind the low beam filament 8 of the optical axis O. Placed in the vicinity. At the tip of the tubular glass sphere 5b, a shielding film 5e that shields the light directly emitted forward from the low beam and high beam filaments (8, 10) is provided. In this embodiment, a light source that emits light from a semiconductor light emitting element such as an LED may be used instead of the light source valve 5 that emits light from the filament.

As shown in FIGS. 2 (b) and 2 (c), the inner shade 9 has a bottomed cup shape that opens upward when viewed from the front. At the rear end of the inner shade 9, a light-shielding portion 9a formed in a curved shape that is convex rearward when viewed from above is provided. At the upper end of the light-shielding portion 9a shown in FIG. 2C, a left-descending cut-off line forming end 9c inclined diagonally downward to the left from the top portion 9b located directly below and in the vicinity of the optical axis O when viewed from the front, and from the top portion 9b. A right-down cut-off line forming end 9d formed so as to incline diagonally downward to the right is provided.

The left descending cut-offline forming end 9c and the right descending cut-offline forming end 9d in FIG. 2C are inclined downward by 15 ° with respect to the axis line O1 extending in the direction orthogonal to the optical axis O and in the horizontal direction, respectively. It is formed. The downward inclination angle of the left and right descending cut-offline forming ends is not limited to 15 °. Further, one of the descending cut-off line forming ends may be a horizontal cut-off line forming end as in the conventional light source bulb.

The low beam filament 8 has a reflector 6 behind the first light S1 for the low beam while blocking light downward from the left and right descending cut-off line forming ends (9c, 9d) by the inner shade 9 of FIG. 2 (c). Irradiate to. The first light S1 has left and right descending cut-off lines (12, 13) inclined by approximately 15 ° diagonally to the left and diagonally downward to the right from the horizontal direction. On the other hand, the high beam filament 10 irradiates the rear reflector 6 with the second light S3 for the high beam without being shielded from light.

The reflector 6 shown in FIGS. 1 and 3 has a reflecting surface 6a composed of a plurality of reflecting segments, and reflects light incident on the reflecting surface 6a from the light source bulb 5 forward so as to reverse the vertical and horizontal directions. The reflection surface 6a in FIG. 3 is connected to the low beam reflection segment group 14 (low beam forming region) located above the line connected by the points P1-P2-P3-P4 and the point P1-P2-P3-P4. It is formed by a high beam dedicated reflection segment group 15 (high beam formation dedicated region) composed of high beam reflection segments 15a located below the line. As shown in FIG. 4, the first light S1 of the low beam filament 8 is incident only on the low beam reflection segment group 14, and the second light S3 of the high beam filament 10 is the low beam reflection segment group 14 and the high beam dedicated reflection. It is incident on the entire reflecting surface 6a including the segment group 15.

As shown in FIG. 3, the low beam reflection segment group 14 includes a plurality of first cut-offline forming segments provided in a region surrounded by points P1-P2-P5-P6 from the outer circumference to the inner circumference on the left side of the reflection surface 6a. 16 and a plurality of second cut-off line forming segments 17 provided in a region surrounded by reflector points P3-P4-P7-P8 from the outer circumference to the inner circumference on the right side of the reflecting surface, and P6-P5-P8-P7. It is formed by a plurality of general-purpose segments 18 provided in a region above the connecting line.

The plurality of general-purpose segments surrounded by the points P7-P9-P10 shown in FIG. 3 form an auxiliary light-collecting segment 26 which is an auxiliary light-collecting region of the reflection surface 6a of the reflector 6. The plurality of general-purpose segments forming the auxiliary light-collecting segment 26 are continuously formed from the vicinity of the outer periphery of the low-beam reflection segment group 14 of the reflector 6. The auxiliary condensing segment 26 is formed in a region near the outer periphery of the low beam reflection segment group 14 of the reflector 6 to increase the condensing degree of the reflected light and display a bright small light image having a high luminous flux density in front of the vehicle. do.

As shown in FIG. 3, at the lower end of the plurality of first cut-offline forming segments 16, continuous left cut-offline forming ends 19 are formed on the line connecting the points P1-P2, and the plurality of second cut-offline forming segments 17 are formed. A continuous right cut-off line forming end 20 is formed on the line connecting the points P3-P4 at the lower end portion of the above.

The left and right cut-offline forming ends (19, 20) in FIG. 3 are inclined downward by approximately + 5 ° at the maximum from the left and right descending cut-offline forming ends (9c, 9d) of the inner shade 9 (that is,). , 15 ° + a margin of up to approximately 5 °) is formed. As a result, the descending cut-off line (12, 13) formed by the first light S1 shown in FIG. 2 and inclined diagonally downward to the left and right by approximately 15 ° does not protrude to the high beam dedicated reflection segment group 15 side due to the above margin. It is formed in the reflection segment group 14 for low beam. The maximum value of the margin is not limited to + about 5 ° as long as it is tilted downward by a slight angle.

As shown in FIG. 1, the first light S1 incident on the reflection surface 6a from the low beam filament 8 is reflected forward and diagonally downward by the low beam reflection segment group 14, and the reflected light S2 of the first light S1 is shown in FIG. The low beam light distribution pattern Lp is displayed. Further, as shown in FIG. 1, the second light S3 incident on the reflection surface 6a from the high beam filament 10 is reflected forward by both the low beam reflection segment group 14 and the high beam dedicated reflection segment group 15, and the second light S3 The reflected light S4 of the above displays the light distribution pattern Hp for the high beam of FIG.

Specifically, among the reflected light S2 generated when the low beam filament 8 shown in FIG. 1 is lit, the first cut-off line forming segment 16 in the lower left region of the low beam reflected segment group 14 of the reflector 6 shown in FIGS. 3 and 4. , The second cut-off line forming segment 17 in the lower right region of the low beam reflection segment group 14, the left general-purpose segment 18a arranged in the left half of the reflection surface 6a of the general-purpose segments 18, and the reflection surface 6a of the general-purpose segments 18. The light (S21, S22, S23, S24) reflected by the right general-purpose segment 18b (excluding the auxiliary condensing segment 26) arranged in the right half is inverted and reflected vertically and horizontally to form the low beam light distribution pattern Lp. Display the entire area forward. At that time, the reflected light S21 by the first cut-off line forming segment 16 is focused on the vicinity of the horizontal line HH indicating the line of sight of the oncoming vehicle driver without being diffused upward to the right, and has the horizontal cut-off line 22. By displaying the light region Lp1, the low beam light distribution pattern Lp having a clear horizontal cut-off line 22 is displayed farther without causing dazzling to the oncoming vehicle driver.

Further, as shown in FIG. 1, the second light S3 generated when the high beam filament 10 is lit is the entire area of the reflection surface 6a composed of the low beam reflection segment group 14 and the high beam dedicated reflection segment group 15 from behind the low beam filament 8. Incident to. Of the reflected light S4, the light S41 reflected by the low beam reflection segment group 14 (excluding the auxiliary condensing segment 26) shown in FIGS. 3 and 5 is reflected forward and substantially horizontally without being inverted. The entire area of the first light distribution pattern Hp1 is displayed forward, and the light S42 reflected by the high beam dedicated reflection segment group 15 displays the second light distribution pattern Hp2 forward, and the first and second light distribution patterns (Hp1) are displayed. , Hp2) displays the high beam light distribution pattern Hp forward by being synthesized.

The first light distribution pattern Hp1 shown in FIG. 5 has a shape in which the low beam light distribution pattern Lp of FIG. 4 is inverted so as to be symmetrical with respect to the intersection of the horizontal line HH and the predetermined vertical line VV. .. The second light distribution pattern Hp2 shown in FIG. 5 is displayed below the first light distribution pattern Hp1 in a state where a part thereof overlaps with the first light distribution pattern Hp1.

As shown in FIG. 5, in the center of the high beam light distribution pattern Hp (the peripheral region centered on the intersection of the horizontal line HH and the vertical line VV), the hot zone Hz (three-dot chain line) is formed by condensing the luminous flux. The brightest part inside the high beam light distribution pattern shown) is formed.

On the other hand, the auxiliary condensing segment 26 provided in the low beam reflection segment group 14 of the reflector 6 shown in FIGS. 3 and 4 is an auxiliary light distribution by the light S25 which is a part of the reflected light S2 when the low beam filament 8 is lit. Hz1 is displayed below the HH line and on the VV line so as to be superimposed on the low beam light distribution pattern Lp. Further, as shown in FIGS. 3 and 5, the auxiliary condensing segment 26 has the light S43, which is a part of the reflected light S4 when the high beam filament 10 is lit, and the auxiliary light distribution Hz2 in the center of the hot zone Hz for the high beam. Display in layers.

As shown in FIGS. 4 and 5, the auxiliary condensing segment 26 formed in the region near the outer periphery of the low beam reflection segment group 14 of the reflector 6 contributes to the generation of the low beam light distribution pattern Lp when the low beam filament 8 is lit. When the high beam filament 10 is lit, the plurality of general-purpose segments 18 excluding the auxiliary focusing segment 18 display the entire high beam light distribution pattern Hp, and the auxiliary distribution has a high degree of focusing in the center of the hot zone Hz. The light Hz2 is displayed to contribute to the increase in the Hz light beam in the hot zone. As a result, the vehicle headlight 1 of the present embodiment can form a high beam light distribution pattern Hp having a sufficient maximum luminous intensity.

In the vehicle 24 shown in FIG. 6, the high beam light distribution pattern Hp is displayed from the own lane Ln1 side to the oncoming lane Ln2 side of the road surface in front of the vehicle by the vehicle headlight 1 of the present embodiment shown in FIG. The two-dot chain line in FIG. 5 shows the high beam light distribution pattern Hpp when it is assumed that the reflector having no auxiliary condensing segment as in the present embodiment is adopted for the light source bulb 5 of the present embodiment.

The light source bulb 5 of the present embodiment shown in FIGS. 2 (a) to 2 (c) is a high-efficiency bulb and has a cut-off line that tilts diagonally downward on both the left and right sides instead of a cut-off line that tilts horizontally and diagonally downward. Irradiate the reflector with offline light. Therefore, as shown in FIG. 6, the area dedicated to the high beam formation of the reflector used can be narrowed due to the need to form the cut-off line forming end for determining the low beam forming region diagonally downward from the conventional horizontal direction. The high beam light distribution pattern Hpp displayed by the light source valve 5 and the reflector having no auxiliary condensing segment is irradiated only to a position close to the vehicle 24 because the light flux emitted to the hot zone is insufficient.

However, as shown in FIG. 5, in the high beam light distribution pattern Hp by the vehicle headlight 1 of the present embodiment, the auxiliary light distribution Hz2 by the auxiliary condensing segment 26 is superimposed on the hot zone Hz in the high beam light distribution pattern Hp. Since the luminous flux in the hot zone Hz is increased by the irradiation, it is excellent in that it is irradiated farther than the high beam light distribution pattern Hpp as shown in FIG.

In this embodiment, assuming that the vehicle is used in a country with right-hand traffic, the first cut-offline forming segment 16 of the low beam reflection segment group 14 displays the horizontal cut-off line, and the second cut-off line is formed. The segment 17 may be configured to form a right diagonal cut-off line.

1 Vehicle headlight 5 Light source bulb (light source)
6 Reflector 6a Reflective surface 8 Low beam filament (first light emitting part)
9 Inner shade (light-shielding member)
10 High beam filament (second light emitting part)
14 Low beam reflection segment group (low beam formation region)
15 High beam dedicated reflection segment group (high beam formation dedicated area)
26 Auxiliary light collection segment (auxiliary light collection area)
Hz High beam light distribution pattern hot zone Hz2 Auxiliary light distribution Hp High beam light distribution pattern Lp Low beam light distribution pattern S1 1st light S2 2nd light

Claims (3)

A reflector having a reflective surface consisting of a low beam forming region and a high beam forming dedicated region,
The first light emitting unit that irradiates the low beam forming region of the reflector through the light-shielding member to form a low beam light distribution pattern in the forward direction, and the second light emitting unit that lights up and emits by selecting the first light emitting unit. Is irradiated to both the low beam forming region and the high beam forming dedicated region of the reflector to block the second light emitting portion that forms the high beam light distribution pattern forward and the first light that goes downward from the cutoff line forming end. In a vehicle headlight having an inner shade, and a light source comprising.
The reflector and the light source are provided inside the lamp body and the transparent or translucent front lens.
The low beam forming region of the reflector is formed so as to have an auxiliary condensing region that reflects the auxiliary light distribution in the high beam hot zone formed when the reflected light of the high beam forming dedicated region is irradiated .
The reflector is composed of a plurality of reflection segments.
The auxiliary focusing region of the low beam forming region is composed of a plurality of continuously formed reflection segments, and serves as an auxiliary focusing segment that concentrates and reflects a part of the second light toward the high beam hot zone. Formed,
The auxiliary condensing segment is formed so as to reflect the auxiliary light distribution by a part of the first light to the region below the HH line and on the VV line when the filament for low beam is lit.
The cut-off line forming end is a left-descending cut-off line forming end formed so as to incline diagonally downward to the left by 15 ° from the top with respect to an axis extending in a direction orthogonal to the optical axis and in a horizontal direction, and a cut-off line forming end diagonally downward to the right from the top. A vehicle headlight, characterized by having a right-down cut-off line forming end, which is formed to be tilted at 15 ° . The vehicle headlight according to claim 1, wherein the auxiliary condensing region is formed in the vicinity of the outer periphery of the low beam forming region of the reflector . The vehicle headlight according to claim 1 or 2, wherein the auxiliary condensing region irradiates a part of the second light to a region having the maximum luminous intensity of the high beam light distribution pattern .

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