JP4452415B2 - Projector type headlamp - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a headlamp for a vehicle, and is specifically referred to as a projector type. The headlamp has a light distribution characteristic formed by an elliptical reflecting surface and a projection lens. An object of the present invention is to provide a configuration capable of switching between running light distribution and enlarging a lamp light emitting area by employing an oval lens.
[0002]
[Prior art]
Conventional projector type headlamps adopting this type of oval lens are disclosed in Japanese Patent Application Laid-Open Nos. 10-199306 and 10-261302 by the same applicant, and includes a cylindrical lens portion and an aspherical surface. By adopting an oval lens composed of a lens part, it is possible to expand the lamp light emitting area, which is a disadvantage of the projector type headlamp, and to improve the visibility from an oncoming vehicle or the like.
[0003]
[Problems to be solved by the invention]
However, in the projector headlamp having the above-described conventional configuration, in order to correspond to the oval lens, the reflector is divided into a substantially radial shape with the light source as the center, but the light distribution characteristic is formed. In some cases, there has been a problem that pattern formation is difficult, for example, glare is likely to occur.
[0004]
Moreover, since the technique of the above-mentioned conventional example was mainly aimed at forming a passing light distribution, for example, a movable part is provided in the lamp so that the passing light distribution and the traveling light distribution can be switched. When trying to do this, the light distribution characteristics on either side tend to be inadequate and the problem of not being able to satisfy market demands has arisen.
[0005]
[Means for Solving the Problems]
In the present invention, as a specific means for solving the above-described conventional problems, an aspherical cylindrical lens part is arranged in the center with the axis as a horizontal direction, and an aspherical lens part divided into two at the left and right ends is combined. In the projector-type headlamp that employs an integrated oval lens, the reflector combined with the oval lens is divided into 4 to 14 sections in a radial range of 10 to 90 ° with respect to the lamp central axis. In addition, segment reflectors are formed in the section area in the vertical and horizontal directions, and 4 to 24 segment reflectors are combined in one lamp to form a multiple ellipse reflector. If the segment reflector is a focal point of the first focal point, the cylindrical lens unit, and the aspherical lens unit in the vicinity of the light source A segment reflector that is a strip-shaped spheroidal surface or a free-form surface based on an ellipse, with a second focal point located at a free position within the range of the lens width up to the lens tip, and a light source In the vicinity of the first focal point, in the cylindrical lens unit, on the linear focal line of the cylindrical lens unit, and in the aspherical lens unit, the position corresponding to the curved focal line of the aspherical lens unit. A segmented reflector that is a strip-shaped spheroidal surface or a free-form surface based on an ellipse, in which the second focal points are dispersed, and the elliptical lens on the upper and lower sides of a horizontal center line. In the state where the reflectors are separated, the segment reflector located on the upper side has the first focal point at the front end of the light source, and the segment reflector located on the lower side has the light source. A strip-like shape in which a first focal point is arranged at the rear end, and a second focal point is distributed at positions corresponding to the focal line of the cylindrical lens unit and the curved focal line of the aspheric lens unit. The segment reflector, which is a free-form surface based on an ellipse, or a segmented reflector belonging to the area where the segment reflector belongs, corresponding to the reflected image characteristics required by the direction from the light source. A strip shape with the first focal point near the light source and the second focal point in the horizontal direction, distributed at arbitrary positions within the vertical line plane in which the focal line of the cylindrical lens part and the focal line of the aspherical lens extend vertically of spheroid, or is composed of a segment reflector is a free curved surface which is based on an ellipse, the light-shielding shutter, the Shirindorikarure Horizontally or forwardly as it expands toward the lens side as it moves in the horizontal direction around the light source position so that it substantially follows the second focal position of the segment reflector in the upper part with the focal line of the lens as the reference. The problem is solved by providing a projector-type headlamp characterized by having the shape described above.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Below, this invention is demonstrated in detail based on embodiment shown in a figure. 1 is a projector-type headlamp according to the present invention (hereinafter abbreviated as headlamp 1). This headlamp 1 is basically an elliptical reflector such as a spheroid. Is the same as that of the conventional example in that the oval lens 2 is employed.
[0007]
Here, the oval lens 2 will be described. The oval lens 2 is divided into two aspherical lenses that have been conventionally used as projection lenses for projector-type headlamps, and separated by 30 to 150 mm. The aspherical lens part 2a is opposed to each other at the dividing surface, and the cylindrical lens part 2b is provided along the curvature of the aspherical lens part 2a. In this way, the aspect ratio is 1: 2 to 1: 6 oval lens 2 is obtained.
[0008]
At this time, the focal length of the aspherical lens portion 2a is set to 20 to 80 mm, and therefore the focal length of the cylindrical lens portion 2b is the same. The focal point of the oval lens 2 that is a combination of the aspherical lens portion 2a and the cylindrical lens portion 2b is a line having the same length as the cylindrical lens portion 2b. The light source 3 is an incandescent bulb or a discharge lamp provided near the center of the oval lens 2.
[0009]
The reflector 4 is radially divided into 4 to 14 sections in a range of 10 to 90 ° with respect to the lamp central axis X on which the light source 3 is installed, and is further vertically and horizontally in the partitioned sections. The segment reflector 4a is also divided, and the reflector 4 is a multiple ellipse reflector in which 4 to 24 segment reflectors 4a are combined in one lamp.
[0010]
Since the segment reflector 4a of the reflector 4 is basically elliptical, such as a spheroid having the light source 3 as the first focus, in the above description, it is the same as the projector type headlamp of the conventional example. Is provided with a light-shielding shutter 5 to shield unnecessary portions for forming a passing light distribution.
[0011]
At this time, for example, when forming a passing light distribution such as a 15 ° rise to the left for left-hand traffic, the cylindrical lens portion 2b converges only in the vertical direction, so that it is suitable for forming a clear pattern shape. Therefore, the cutout portion 5a for forming the above-described shape in the light-shielding shutter 5 is provided at least at one position in front of the portion where the aspherical lens portion 2a and the cylindrical lens portion 2b are connected. Is formed by light from the aspherical lens portion 2a.
[0012]
The light shielding shutter 5 has a flat plate shape whose upper end is matched with the vicinity of the focal line of the cylindrical lens portion 2b, or a flat plate portion corresponding to the combined cylindrical lens portion 2b. The aspheric lens portion 2a has a focal point. The shape is curved from the position toward the lens side. Further, the light shielding shutter 5 is provided with a change in the plate thickness in order to prevent the irradiation light from being colored by color separation by the aspherical lens portion 2a, and the upper end thereof is subjected to low reflection processing by black coating or the like. Yes.
[0013]
As described above, in the present invention, the center portion (hot zone) of the passing light distribution is formed by the aspherical lens portion 2a, and the portion extending to the left and right is formed by the cylindrical lens portion 2b. Therefore, it is incident on the aspherical lens portion 2a with the segment reflector 4a in the range of the left and right portions or the left and right portions plus a part of the upper and lower portions around the light source 3 that can provide a reflection image advantageous for forming the central portion. The reflected light is made, and the reflected light incident on the cylindrical lens portion 2b is made at the portion other than the reflected light.
[0014]
In order to achieve the above object, each segment reflector 4a is formed in various ways as described below depending on the position of the segment reflector 4a, and by combining these, the amount of light shielded by the light shielding shutter 5 is reduced, and the head For example, the luminous flux utilization factor of the lamp 1 can be improved, and an ideal light distribution shape can be formed.
[0015]
(1) The first focal point in the vicinity of the light source 3 and the second focal point at a free position from the focal point of the cylindrical lens part 2b and the aspherical lens part 2a to the tip of the lens 2 and within the range of the lens 2 width. A segment reflector 4a that is a strip-shaped spheroid or a free curved surface based on an ellipse.
[0016]
(2) The vicinity of the light source 3 is the first focal point, the cylindrical lens unit 2b is on the linear focal line of the cylindrical lens unit 2b, and the aspherical lens unit 2a is curved on the aspherical lens unit 2a. The segment reflector 4a which is a strip-shaped spheroidal surface or a free-form surface based on an ellipse, in which the second focal points are distributed at corresponding positions on the focal line.
[0017]
(3) The reflector 4 is divided into an upper side and a lower side from the center of the cylindrical lens part 2b and the aspherical lens part 2a. The segment reflector 4a located on the upper side of the cylindrical lens part 2b and the aspherical lens part 2a has a first focal point at the front end of the light source 3 and a lower side. In the segment reflector 4a positioned, the first focal point is disposed at the rear end of the light source, the irradiation angle of the headlamp 1 on the focal line in the cylindrical lens unit 2b, and on the curved focal line in the aspherical lens unit 2a. A segment reflector 4a which is a strip-shaped rotating ellipsoid or a free-form surface based on an ellipse with a second focal point arranged corresponding to.
[0018]
(4) Corresponding to the reflected image characteristics required by the direction in which the light source 3 is located, each of the segment reflectors 4a belonging to the area where the light source 3 is located has the light source 3 vicinity as the first focus and the second focus in the horizontal direction. A strip-shaped spheroidal surface or a free-form surface based on an ellipse, which is distributed at arbitrary positions within a vertical line obtained by vertically extending the focal line of the cylindrical lens portion 2b and the focal line of the aspherical lens 2a. The segment reflector 4a.
[0019]
Consists of the segment reflectors 4a described above. Thereby, convergence is performed in the vertical direction, and in the left-right direction, the light is condensed or expanded in accordance with the light distribution design, so that the light distribution suitable for passing light distribution is obtained. A characteristic is formed.
[0020]
Here, the inventor adopts the above-described configuration, so that when the light distribution characteristic that is incident on the cylindrical lens portion 2b from the oblique upper side of the reflector 4 and spreads to the left and right is formed, the cylindrical lens portion 2b is inclined from the oblique upper side. It has been found that the light incident on is not shielded by the light shielding shutter 5 disposed at the position of the focal line of the cylindrical lens portion 2b, but jumps upward from the horizontal line and becomes glare light.
[0021]
In order to cope with this state, in the present invention, when setting the second focus position, the left and right angles of the reflected light obtained by the position, area, and incident direction of the segment reflector 4a are set in the upper portion of the reflector 4 and incident. The second focus position is set such that the point relationship is a horizontal substantially V-shape that opens widening from the focal position of the cylindrical lens portion 2b toward the lens 2 side, or a substantially V-shape that rises forward.
[0022]
Corresponding to the second focal position set as described above, the shading shutter 5 is also formed in a substantially horizontal substantially V-shape that expands from the focal position of the cylindrical lens portion 2b toward the front. The flange-shaped part 5b having the above-mentioned opening is projected forward to prevent the generation of glare light.
[0023]
The above is the basic configuration of the headlamp 1 of the present invention. As is clear from the above description, a headlamp dedicated to passing light distribution can be obtained. Therefore, when installing in a vehicle, it becomes necessary to prepare a separate lamp for traveling light distribution. In other words, there is a problem that the cost increases due to the so-called four-lamp type. There is a strong demand for two lamps that can switch between light distribution and running light distribution with two lamps.
[0024]
In order to meet the above market demand, in the present invention, as shown in FIGS. 2 and 3, the unit of the headlamp 1 described above in which the oval lens 2, the reflector 4, and the light shielding shutter 5 are combined. A dedicated traveling beam reflector 6 is provided on the outer peripheral portion as a dedicated traveling beam, which is a rotating paraboloid, a parabolic column surface, or a parabolic free-form surface combining them with a focus set in the vicinity of the light source 3. In addition, a movable light shielding hood 7 is provided between the light source 3 and the traveling beam dedicated reflector 6, and the movable light shielding hood 7 is moved to switch between the passing light distribution and the traveling light distribution. .
[0025]
The movable light-shielding hood 7 shields the light from the light source 3 toward the traveling beam dedicated reflector 6 when the headlamp 1 is required to pass in the low direction, and when traveling light distribution is required, as shown in FIG. Retreating from the light path of the light directed from the light source 3 toward the traveling beam dedicated reflector 6, the traveling beam dedicated reflector 6 generates reflected light, and the reflected light from the reflector 4 is overlapped to form a traveling light distribution.
[0026]
At this time, if the light from the reflector 4 and the light from the traveling beam dedicated reflector 6 are only superimposed, the light from the reflector 4 is essentially downward light for forming a passing light distribution. In addition, there may be a shortage in the distance visibility required for traveling light distribution. In such a case, it is preferable that the light shielding shutter 5 is also moved to a position where the upward light is not shielded from the reflected light from the reflector 4 in conjunction with the movement of the movable light shielding hood 7.
[0027]
As described above, when the light-shielding shutter 5 is also moved, the light-shielding shutter 5 and the movable light-shielding hood 7 are formed as separate bodies, and each is provided with a drive unit such as a solenoid (not shown). For example, as shown in FIG. 4, both 5 and 7 may be integrated and moved by one solenoid 8.
[0028]
FIG. 5 shows an isoilluminance curve diagram of the passing light distribution D of the headlamp 1 according to the present invention. FIG. 6 shows the traveling distribution by moving the light shielding shutter 5 and the movable light shielding hood 7 with the same headlamp 1. This shows the state when the light is H. Thus, according to the headlamp 1 of the present invention, it is possible to switch between the passing light distribution D and the traveling light distribution H, that is, a two-lamp headlamp. Is possible.
[0029]
FIG. 7 is a wire frame diagram showing the state of mass production of the headlamp 1 of the present invention. The reflector 4 and the traveling beam dedicated reflector 6 are made of a resin member by BMC molding or die casting or the like. The metal member is integrally formed.
[0030]
A solenoid 8 for driving the light shielding shutter 5 and the movable light shielding hood 7 is formed of a metal member by die casting or the like, and is assembled to a lens holder 9 for holding and positioning the oval lens 2. 9, the integrated reflector 4 and the traveling beam dedicated reflector 6 are assembled so that the positional relationship between them is accurately maintained. Although illustration is omitted, for example, it is possible to provide a fixed light-shielding shutter if necessary, for example, suppressing excessive upward light even during traveling light distribution.
[0031]
FIGS. 8 and 9 show another embodiment of the present invention. The headlamp 1 of the present invention has an oval lens 2 as compared with a conventional projector-type headlamp employing a circular aspheric lens. The area is large and the internal structure is easy to see through. Therefore, as shown in FIG. 8, the internal extension 10 is provided between the oval lens 2 and the reflector 4 below the light blocking shutter 5 so as to be integrated with or separate from the light blocking shutter 5. It is free to prevent this.
[0032]
Furthermore, as shown in FIG. 9, an outer extension 11 is attached to the outer periphery of the oval lens 2 and subjected to appropriate surface treatment such as painting, aluminum vapor deposition, or chrome plating, to harmonize with the vehicle body design. Plan. Alternatively, it is possible to improve the aesthetics of the headlamp 1 itself.
[0033]
【The invention's effect】
As described above, when the projector-type headlamp has the configuration of the present invention, when the light is incident on the oval lens obliquely from above the reflector and the left and right irradiation widths are to be secured. According to the present invention, glare light is not generated by the hook-shaped portion provided on the light-shielding shutter, and the accuracy of the alignment pattern is improved.
[0034]
In addition, it is possible to realize a two-lamp headlamp with the shape that best matches the vehicle design of the above-mentioned oval lens, and it has an excellent effect on improving the design of the vehicle, and there is also a lamp dedicated to traveling light distribution. As unnecessary, it has an extremely excellent effect on cost reduction.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a main part of an embodiment when a projector type headlamp according to the present invention is exclusively used for passing light distribution.
FIG. 2 is a perspective view showing an embodiment in which the projector-type headlamp according to the present invention is a light distribution switching type in a state of passing light distribution.
FIG. 3 is a perspective view showing an embodiment in the same way as a light distribution switching type in a traveling light distribution state.
FIG. 4 is a perspective view showing a state in which a light shielding shutter and a movable light shielding hood are integrally formed.
FIG. 5 is a graph showing a passing light distribution of the projector type headlamp according to the present invention.
FIG. 6 is a graph showing traveling light distribution of the projector type headlamp according to the present invention.
FIG. 7 is an explanatory diagram showing an assembled state of the projector-type headlamp according to the present invention.
FIG. 8 is an explanatory diagram showing an attached state of the inner extension of the projector-type headlamp according to the present invention.
FIG. 9 is an explanatory diagram showing an attached state of the outer extension of the projector-type headlamp according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Projector type head lamp 2 ... Ellipse lens 2a ... Aspherical lens part 2b ... Cylindrical lens part 3 ... Light source 4 ... Reflector 4a ... Segment reflector 5 ... Light-shielding shutter 5a ... Spear shape Section 6 …… Traffic beam dedicated reflector 7 …… Moving light shielding hood 8 …… Solenoid 9 …… Lens holder 10 …… Inner extension 11 …… Outer extension

Claims (13)

In the projector-type headlamp comprising an oval lens in which an aspherical cylindrical lens portion is arranged in the center with the axis as a horizontal direction and two left and right aspheric lens portions are combined and integrated at the left and right ends thereof, The reflector combined with the oval lens is divided into 4 to 14 sections radially in a range of 10 to 90 ° with respect to the center axis of the lamp, and is also divided into vertical and horizontal directions within the section area. A reflector is formed, and 4 to 24 segment reflectors are combined in one lamp to form a multiple ellipse reflector, and each segment reflector has a first focal point near the light source, the cylindrical lens unit, and From the focal point of the aspherical lens unit to the tip of the lens, and within the range of the lens width A segmented reflector that is a strip-shaped rotating ellipsoid or a free-form surface based on an ellipse with a focal point, and a first focal point in the vicinity of the light source. In the cylindrical lens portion, the linear shape of the cylindrical lens portion In the aspherical lens part, and in the aspherical lens part, a strip-shaped spheroid or ellipse in which the second focal point is dispersed and arranged at positions corresponding to the curved focal line of the aspherical lens part. The segment reflector, which is a free-form surface based on the above, and the segmented reflector located on the upper side with the oval lens divided into the upper and lower sides along the horizontal center line, at the front end of the light source In the segment reflector located on the lower side of the first focal point, the first focal point is disposed at the rear end of the light source, and the focal point of the cylindrical lens unit is arranged. A strip-shaped spheroidal ellipsoid or a free-form surface based on an ellipse, in which the second focal point is dispersed and arranged at a position corresponding to a curved focal line of the aspherical lens portion. In response to the reflected image characteristics required by the direction in which the segment reflector and the light source are located, each segment reflector belonging to the area where the light source is located has the light source vicinity as the first focus and the second focus in the horizontal direction as a cylindrical shape. It is a strip-shaped spheroid or a free-form surface based on an ellipse that is distributed at an arbitrary position in a vertical line that extends the focal line of the lens unit and the aspherical lens. It is composed of a segment reflectors are,
The light shielding shutter,
Horizontal or near-lens as it moves in the horizontal direction around the light source position so as to substantially follow the second focal position of the upper segment reflector with the focal line of the cylindrical lens as a reference. A projector-type headlamp characterized by a front-up shape . The left and right segment reflectors with the light source as the center, or the segment reflector with the upper and lower parts added to the left and right, make the reflected light incident on the aspherical lens part, and the other upper and lower segment reflectors enter the cylindrical lens part. The projector-type headlamp according to claim 1, wherein the projector-type headlamp produces light. In the vicinity of the focal line of the cylindrical lens part and on the aspherical lens part side, the half of the top or bottom or the center is opened from the vicinity of the focal line that curves to the lens side in the horizontal direction of the center of the aspherical lens part. 3. The projector type headlamp according to claim 1, further comprising light shielding shutters provided on the upper and lower sides. In correspondence with the boundary between the cylindrical lens portion and the aspherical lens portion of the light shielding shutter, a cutout portion for forming an asymmetric pattern at the time of passing beam is provided on either the left or right side or both sides. The projector-type headlamp according to claim 1, wherein the projector-type headlamp is provided. 5. The projector type according to claim 1 , wherein the light-shielding shutter has a substantially V-shape that extends forward along the second focal position of the segment reflector in the upper portion. head lamp. Around the lamp unit that combines the oval lens, the multiple elliptical reflector, and the light shielding shutter, a rotating paraboloid having a focal point near the light source, a parabolic column surface, or a combination surface thereof is used as a reflector for traveling beam. A movable light shielding hood is provided between the light source and the traveling beam dedicated reflector, which shields light reaching the traveling beam dedicated reflector from the light source when passing the beam and provides light when traveling beam. The projector type headlamp according to any one of claims 1 to 5. The projector-type headlamp according to claim 1, wherein a part or all of the movable light-shielding hood is movable in conjunction with the movement of the movable light-shielding hood. The projector-type headlamp according to any one of claims 1 to 7, wherein the movable light-shielding hood and the light-shielding shutter are integrated and rotate using a solenoid as a power mechanism. The multiple ellipse reflector and the traveling beam dedicated reflector are integrated, and the power mechanism that moves the movable light shielding hood and the light shielding shutter is assembled to a lens holder that holds the oval lens. The projector-type headlamp according to claim 1, wherein the projector-type headlamp is assembled to the integrated reflector. The projector-type headlamp according to any one of claims 3 to 9, wherein the light-shielding shutter has a dimension that changes in a plate thickness direction, and an anti-reflection treatment is performed on an upper end surface thereof. At a position between the oval lens and the reflector or at a lower position between the oval lens and the light-shielding shutter, the light-shielding shutter is formed integrally or separately. The projector-type headlamp according to any one of claims 1 to 10, wherein an inner extension made of a gloss material is provided. The projector-type headlamp according to any one of claims 1 to 11, wherein an outer extension that is colored or brightened is provided on an outer periphery of the oval lens. The left-right width of the cylindrical lens portion in the oval lens is 30 mm or more, and the aspect ratio of the oval lens is in the range of 1: 2 to 1: 6. A projector-type headlamp according to claim 1.

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