JP2546897Y2 - Variable light distribution type headlamp - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vehicular lamp, and more particularly to a variable light distribution type headlight which changes a light distribution by displacing a reflector attached with a valve in the left-right or up-down direction with respect to an optical axis. It is about lights.

[0002]

2. Description of the Related Art Conventionally, there is a steering interlocking headlight in which the light distribution of an irradiation light beam is changed in accordance with the rotation angle of a steering wheel. A collimator lens is provided so as to share a second focal point on the optical axis, and a shade is pivotally provided between the valve and the collimator lens provided at the first focal position of the reflector, and the shade is directed toward the optical axis by a displacement driving mechanism. In this case, the light distribution pattern of the irradiation light beam is changed by moving forward and backward.

[0003]

That is, in this type of variable light distribution headlamp, the illuminance distribution of the illuminating light beam is determined by the projection of the illuminance distribution on the focal plane of the collimator lens. The illuminance distribution is affected by the distribution of the light beam on the focal plane focused by the reflector. Therefore, in the configuration of the above-mentioned conventional light distribution variable type headlight, when the optical arrangement of the collimator lens and the shade is fixed, the pattern of the irradiation light beam can maintain the shape of the cutoff line, Changing the optical arrangement of the reflector with respect to the shade changes the illuminance distribution of the cutoff line. That is, when the reflector is displaced along the optical axis, the state of condensing the light beam changes, and when displaced in a direction perpendicular to the optical axis, the irradiation pattern is displaced in the opposite direction.

The present invention has been made in view of the above problems, and has a light distribution variable which can form a pattern of an irradiation light beam with a clear cut-off line and can obtain a light distribution pattern adapted to a traveling environment of a vehicle. It is an object to provide a mold headlight.

[0005]

In order to achieve the above object, a variable light distribution type headlamp according to the present invention has a front lens such as a collimator lens arranged on an optical axis in front of a reflector having an elliptical reflecting mirror surface. while the valve is fixedly mounted to substantially the first focal point of the reflector, the light distribution variable headlight projector type consisting comprises a shade for blocking a portion of the light beam between said front lens and said valve, the collimator lens side the shade fixed on, also the valve and the reflector and the optical axis of the collimator lens to become integral
Thereby pivotally so as to be displaced freely horizontally or vertically as the rotation around the vicinity of the main points of the figure, the reflector,
The reflector is configured to be displaced in the horizontal or vertical direction by a reflector displacement drive device configured on the lamp body, and the shade is
Is formed by the displacement plane of the second focal position of the reflector
The gist of the invention is that it is configured to have a shape along the focal plane to be formed .

[0006]

According to the above arrangement, when the reflector is displaced left and right or up and down with respect to the optical axis, the optical relative position of the collimator lens and the shade does not change. However, since the shade has a shape along the focal plane of the second focal position of the reflector, the optical relative position between the shade and the reflector can also maintain the initial state. For this reason, the pattern of the irradiation light beam maintains the initial illuminance, the cutoff line becomes clear, and even if the irradiation light beam is inclined from the optical axis, the position of the cutoff line formed by the shade does not move from the optical axis. Absent. Also, reflector
Changes around the principal point of the collimator lens as the center of rotation.
Luminous intensity distribution of the entire light distribution pattern
No distortion occurs.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle of a variable light distribution type headlamp according to the present invention will be described below with reference to the drawings. FIG. 1 shows a swing type structure which is linked to a steering of an automobile. In the drawing, reference numeral 1 denotes a focal point F fixed to a lamp body 2 and a principal point C1.
And L is the optical axis. Behind the collimator lens 1, a reflector 3 having an elliptical reflecting mirror surface 3a is pivotally mounted so as to freely swing in the left-right direction with respect to the optical axis L around the principal point C1 as a center of rotation. The lighting bulb 4 is fixedly mounted at the first focal point F1 of the elliptical reflecting mirror surface 3a, and the central axis CL is set to the optical axis L.
The second focal point F2 at the position overlapping with the collimator lens 1
And its position are shared.
The rotation center of the light distribution reflector 3 is preferably at least between the principal point C1 of the collimator lens 1 and a focal plane of a shade 5 described later.

[0008] Reference numeral 5 is fixed to the lamp body 2 and is along a focal plane formed by the second focal point F2 of the reflector 3 (which forms a curved surface around the principal point C1 because the focal point F2 is displaced). It is a shade having a shape to be erected, and is configured to cut a part of the light beam and form a predetermined cutoff line with respect to the optical axis L.

The reflector 3 having the above structure is driven by a reflector displacement driving device described later so as to correspond to the left and right direction (arrow A) with respect to the optical axis L with the vicinity of the principal point C1 as the swing center, for example, the turning direction of the automobile. Figure 2
As shown in the irradiation patterns (a) and (b), the center of the irradiation light beam can be displaced left and right with respect to the optical axis L. At this time, since the shade 5 is erected on the focal plane of the reflector 3, it does not displace with respect to the optical axis L.
Further, since the optical relative position with respect to the reflector 3 does not change, the pattern is not enlarged or reduced. This means that the illuminance can be kept constant without changing the light beam density of the irradiation light beam due to the displacement of the reflector 3.

FIG. 3 shows a vertically slidable structure as a weather-sensitive headlamp of an automobile. Reference numeral 1 denotes a collimator lens fixed to a lamp body 2 and having a focal point F and a principal point C1. , L are optical axes. Behind the collimator lens 1, a central axis CL of a reflector 3 having an elliptical reflecting mirror surface 3a is pivotally mounted so as to be vertically slidable parallel to the optical axis L. The bulb 4 for lighting is fixed at the position of one focal point F1, and the second focal point F2 is configured to share the position with the focal point F of the collimator lens 1 at a position where the central axis CL and the optical axis L overlap. is there.

Reference numeral 5 is fixed to the lamp body 2 and is along a focal plane formed by the second focal point F2 of the reflector 3 (a plane orthogonal to the optical axis L because the focal point F2 is displaced in parallel). The shade is constructed so as to cut a part of the light beam and form a predetermined cutoff line with respect to the optical axis L.

The reflector 3 constructed as described above is moved vertically (arrow B) with respect to the optical axis L of the reflector 3 by a reflector displacement driving device to be described later. When it is displaced upward in the rain, the center of the irradiation light beam can be displaced up and down with respect to the optical axis L as shown in the irradiation patterns of FIGS. 4 (a) and 4 (b). At this time, since the shade 5 is erected on the focal plane of the reflector 3, it is not displaced with respect to the optical axis L, and the optical relative position with the reflector 3 does not change, so that the pattern is enlarged or reduced. Not even. This means that the illuminance can be kept constant without changing the light beam density of the irradiation light beam due to the displacement of the reflector 3. At this time, it is also possible to simultaneously configure the reflector 3 so as to swing slightly upward with the vicinity of the principal point C1 of the collimator lens 1 as the center of swing, and to improve the irradiation efficiency on the road surface particularly during night driving. can do.

Next, an embodiment of the reflector displacement driving device 10 will be described. FIGS. 5 to 8 show a structure in which the central axis CL of the reflector 3 is vertically displaceable in parallel with the optical axis L of the collimator lens 1, and is a ring-like structure fixed to the middle part of the lamp body 2. Gears 13, 13 are respectively provided on pin shafts 12, 12 protruding at 3 o'clock and 9 o'clock positions with respect to the support frame 11, and the inner gear 14a of the gear ring 14 and the two gears 13, 13 mesh with each other. At the same time, the outer gear 14b of the gear ring 14 is meshed with a worm gear 16 which is mounted on the output shaft of a drive motor 15 fixed to the lamp body 2.

The gear ring 14 has an annular sliding case 17 rotatably mounted on the outer gear 14b from the reflector 3 side. Guide pins 18 and 18 are protruded from the sliding case 17 at the positions of 12 o'clock and 6 o'clock, and at the open end of the reflector 3 at 12 o'clock, 3 o'clock and 6 o'clock.
, Sliding hole grooves 20, 20... Pierced in the radial direction with respect to the supporting projections 19, 19,.
The guide pins 18, 18 and the eccentric pins 13a, 13a protruding from the gears 13, 13 are slidably inserted thereinto, and the reflector 3 is pivotally mounted.

Reference numeral 1 denotes a collimator lens, 5 denotes a shade provided on a focal plane, and 4 denotes a lighting bulb fixed to the reflector 3.

In the variable light distribution type headlamp constructed as described above, the drive motor 15 is controlled to rotate right or left to rotate the center axis CL of the reflector 3 in the vertical direction with respect to the optical axis L of the collimator lens 1. In parallel. And
The gear ring 14 meshing the worm gear 16 and the outer gear 14b rotates with the rotation of the drive motor 15. However, the gear ring 14 is provided at the 3 o'clock and 9 o'clock positions of the inner gear 14a with the gears 13 and 1 mounted on the pin shafts 12 and 12.
3, the eccentric pins 13 of the gears 13, 13
The reflector 3 is operated to be displaced in the vertical direction via support projections 19, 19, which are provided at the 3 o'clock and 9 o'clock positions with the sliding hole grooves 20, 20 engaged with the a, 13a.

According to the above configuration, as shown in FIG. 9, the positions of the pin shafts 12, 12 on which the gears 13, 13 are provided are set at the positions of 12 o'clock and 6 o'clock, and the eccentric pins 13a, 13
a is the sliding hole groove 20 of the support projection 19 at that position.
And the positions of the guide pins 18, 18 are set at 3 o'clock and 9 o'clock.
By setting the position at the time, the reflector displacement driving device 10 that displaces the central axis CL of the reflector 3 in the left-right direction with respect to the optical axis L of the collimator lens 1 can be configured.

FIGS. 10 to 12 show an embodiment of a reflector displacement drive device 10 which makes an angular displacement in the elevation direction with the central axis CL of the reflector 3 as the center of swing around the principal point C1 of the collimator lens 1. FIG. It is. In the drawing, 2
Reference numerals 1 and 21 denote support arms projecting forward from the 3 o'clock and 9 o'clock positions of the reflector 3, respectively.
End portions 1 and 21 are pivotally attached to the collimator lens 1 of the lamp body 2 via pin shafts 22 projecting from the principal point C1 of the lamp body 2 with a vertical turning surface.

Gears 25, 25 are respectively mounted on pin shafts 24, 24 protruding at 3 o'clock and 9 o'clock positions with respect to a ring-shaped support frame 23 fixed to the middle part of the lamp body 2. Eccentric pins 26, 2 protruding from eccentric positions of both gears 25, 25
6 are slidably inserted into sliding hole grooves 28, 28 formed in a horizontal direction with respect to supporting projections 27, 27 projecting from the 3 o'clock and 9 o'clock positions of the reflector 3, respectively. The inner gear 29a of the gear 29 meshes with both gears 25, 25, and the outer gear 29b of the gear ring 29 meshes with a worm gear 31 which is mounted on an output shaft of a drive motor 30 fixed to the lamp body 2. .

In the variable light distribution type headlamp constructed as described above, the drive motor 30 is controlled to be driven to the right or left to rotate and the center axis CL of the reflector 3 is adjusted to the principal point C1 of the collimator lens 1.
Is displaced upward and downward with respect to the optical axis L about the rotation center. When the gear ring 29 meshing the worm gear 31 and the outer gear 29b rotates with the rotation of the drive motor 30, the gears 25 meshed with the inner gear 29a rotate. Therefore, the eccentric pins 26, 26 protruding from the eccentric positions of the gears 25, 25 are
The support arms 21 and 21 are pivotally mounted on the support projections 27 and 27 protruding from the 3 o'clock and 9 o'clock positions in order to slide in the slide holes 28 and 28 and displace vertically. The reflector 3 is displaced about the pin shafts 22 and 22 as the center of rotation, and
Of the collimator lens 1 are angularly displaced with respect to the optical axis L of the collimator lens 1.

The reflector displacement driving device 10 is arranged such that the center axis C of the reflector 3 is relative to the optical axis L of the collimator lens 1.
L is displaced by tilting or moving in parallel, and it goes without saying that various modifications can be made in addition to the above-described structure.

Further, the reflector displacement driving device 10 is not only displaced by tilting or moving the central axis CL of the reflector 3 with respect to the optical axis L of the collimator lens 1, but also
By adding a mechanism for moving the reflector 3 back and forth in the direction of the central axis CL, it becomes possible to condense and diffuse the irradiation light beam, and as shown in the light distribution pattern of FIG. It is also possible to configure a traveling environment-sensitive headlight adapted to cope with traveling and stopping, (b) medium traveling, (c) high traveling, and the like.

[0023]

The light distribution variable type headlamp according to the present invention is configured as described above, and when the reflector is displaced left and right or up and down with respect to the optical axis, the optical relative distance between the collimator lens and the shade is reduced. By configuring the reflector displacement driving structure so that the position does not change, and by configuring the shade along the focal plane of the second focal position of the reflector, the shade and the reflector maintain the initial optical relative position. Therefore, the pattern of the irradiation light beam maintains the initial illuminance, the cutoff line becomes clear, and even if the irradiation light beam is inclined from the optical axis, the position of the cutoff line formed by the shade maintains the initial position. It is useful for constructing a control type headlight of various automobiles such as a steering-linked headlight, a weather-sensitive headlight, or a driving environment-sensitive headlight.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a swing type headlamp showing the principle of a variable light distribution type headlamp according to the present invention.

FIG. 2 is an explanatory diagram showing a light distribution pattern of a light beam when traveling straight (a) and turning right (b).

FIG. 3 is an explanatory view of a sliding headlamp showing the principle of the variable light distribution headlamp according to the present invention.

FIG. 4 is an explanatory diagram showing light distribution patterns of light beams in fine weather (a) and rainy weather (b).

FIG. 5 is a partially cutaway perspective view showing the first embodiment of the reflector displacement driving device of the variable light distribution headlamp according to the present invention.

FIG. 6 is a longitudinal sectional view of the same.

FIG. 7 is a front view of the main part.

FIG. 8 is an exploded perspective view of the same.

FIG. 9 is a partially cutaway perspective view showing a second embodiment of the reflector displacement driving device having different sliding directions.

FIG. 10 is an exploded perspective view showing a third embodiment of a reflector displacement driving device having a different displacement method.

FIG. 11 is a longitudinal sectional view of the same.

FIG. 12 is a front view of the main part.

FIG. 13 is an explanatory diagram showing a preferable light distribution pattern when the traveling environment-sensitive headlamp is traveling at a low speed and stopped (a), traveling at a medium speed (b), and traveling a light beam (c).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Collimator lens 2 Lamp body 3 Reflector 4 Bulb 5 Shade 10 Reflector displacement drive

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display F21M 3/20 F21M 3/20 Z

Claims (1)

(57) [Scope of request for utility model registration] With 1. A placing front lens of the collimator lens or the like on the optical axis in front of the reflector having an elliptical reflecting mirror, the valve was fixed to a substantially first focal point of the reflector, between the front lens and the valve in the light distribution variable headlight projector type consisting comprises a shade for blocking a portion of the light beam, fixedly mounted to the shade to the collimator lens side,
The valve and the reflector the optical axis and before the integral
Serial with the vicinity of the main point of the collimator lens is pivotally so as to be displaced freely in the lateral or vertical direction as the center of rotation, the reflector, so as to displace the horizontal or vertical direction by the reflector movement driving apparatus constructed in the lamp body Wherein the shade has a displacement plane at a second focal position of the reflector.
A variable light distribution type headlamp having a shape along a focal plane formed by the light source.