JPH0652702A - Movable reflector projector lamp - Google Patents

Abstract

(57) [Summary] [Purpose] The pattern of the irradiation light flux is formed with a clear cut-off line to obtain a light distribution pattern adapted to the traveling environment of the vehicle. A collimator lens 1 is arranged on the front optical axis of a reflector 3 having a substantially elliptical reflecting mirror surface 3a in which a bulb 5 is fixed at a first focal point F1 position, and a collimator lens 1 is provided between the collimator lens 1 and the bulb 5. The shade 6 is fixedly installed in the. A reflector 3 integrated with a bulb 5 is pivotally mounted via a vertical displacement support mechanism 4 so as to be displaceable to the left and right or up and down with respect to an optical axis, and the reflector 3 is laterally moved by a reflector displacement driving device 18 configured in a lamp body 2. Alternatively, it is configured to be displaced in the vertical direction. Further, the shade 6 is the collimator lens 1
It is configured in a shape along the focal plane formed at the focal point of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a vehicular lamp, and more particularly to a movable projector lamp for a reflector, which displaces a reflector having a bulb in a horizontal or vertical direction with respect to an optical axis. It is a thing.

[0002]

2. Description of the Related Art Conventionally, there is a steering interlocking type headlight which uses a projector lamp in which a light distribution of an irradiation light beam is changed in accordance with a rotation angle of a steering wheel or the like. A collimator lens is provided so as to share a second focus on the front optical axis of the lens, and a shade is pivotally provided between the valve and the collimator lens provided at the first focus position of the reflector, and the shade is driven by a displacement driving mechanism. The light distribution pattern of the irradiation light flux is changed by moving forward and backward toward.

[0003]

That is, in this type of shade movable projector lamp, the illuminance distribution of the illuminating light flux is determined by the projection of the illuminance distribution on the focal plane of the collimator lens, and therefore the illuminance distribution of the illuminating light flux. Is influenced by the distribution state of the light flux on the focal plane collected by the reflector. Therefore, in the configuration of the conventional shade movable projector lamp described above, when the optical arrangement of the collimator lens and the shade is fixed, it is possible to maintain the shape of the cutoff line in the pattern of the irradiation light flux. If the optical arrangement of the reflector is changed with respect to, the illuminance distribution of the cutoff line changes. That is, when the reflector is displaced along the optical axis, the condensed state of the light flux changes, and when displaced in the direction orthogonal to the optical axis, the irradiation pattern is displaced in the opposite direction.

The present invention was devised in view of the above problems, and a reflector movable that 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 running environment of a vehicle. An object of the present invention is to provide a type projector lamp.

[0005]

In order to achieve the above object, a movable projector lamp for a reflector according to the present invention has a front lens such as a collimator lens arranged on the front optical axis of the reflector, and the reflector is substantially omitted. In a projector type reflector movable projector lamp having a bulb fixed to the first focus position and having a shade for blocking a part of a light beam between the bulb and the front lens, the shade is fixed to the collimator lens side. Further, the reflector integrated with the bulb is pivotally mounted so as to be displaceable in the left-right direction or the up-down direction with respect to the optical axis, and the reflector is displaced laterally or vertically by a reflector displacement driving device formed in a lamp body. And the shade along the focal plane formed by the displacement surface of the focal position of the collimator lens. It is an Abstract by being configured in the shape.

[0006]

According to the above construction, the optical relative position of the collimator lens and the shade does not change when the reflector is displaced left and right or up and down with respect to the optical axis. However, since the shade has a shape along the focal plane of the focal position of the collimator lens, 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 flux maintains the initial illuminance so that the cutoff line becomes clear, and even if the irradiation light flux is tilted from the optical axis, the position of the cutoff line formed by the shade does not move from the optical axis.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle of a reflector movable projector lamp according to the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention, in which 1 is a focus F and an optical axis L fixed to a lamp body 2.
1 is a collimator lens. Behind the collimator lens 1, a reflector 3 having a substantially elliptical reflecting mirror surface 3a is slidable in the vertical direction (arrow A) via a vertical displacement support mechanism 4 formed at the rear end of the lamp body 2. The optical axis L2 is rotatably supported and coupled so that the optical axis L2 is displaced parallel to the optical axis L1 of the collimator lens 1. The reflector 3 has a lighting bulb 5 fixed to the first focal point F1 position of the elliptical reflecting mirror surface 3a, and the second focal point F2 is the focal point of the collimator lens 1 at a position where the optical axis L2 overlaps the optical axis L1. It is configured to share the position with F.

Reference numeral 6 denotes a shade fixed to the lamp body 2 and erected along a focal plane formed by the displacement surface of the focal point F of the collimator lens 1, which cuts a part of the light beam. It is configured to form a predetermined cutoff line.

The vertical displacement support mechanism 4 includes a lamp body 2
Sliding rods 10, 8 extending vertically from the reflector cells 9 fixed to the rear end of the reflector 3, to sliding grooves 8, 8 extending vertically in the center of the rear surface of the flange 7 fixed to the rear end. 10 has a structure in which 10 is inserted and is slidably held by a peripheral edge 12 of a cell cover 11 fixed to the rear end of the flange 7.

The cells 13 and 13 are fixed at positions symmetrical with respect to the central axis with respect to the flange 7, and the cell cover 1 is provided.
1 is a control motor that is housed inside 1 and configured to be capable of forward and reverse rotation, and a gear 14 that is axially attached to the drive shaft of each control motor 13.
Respectively engage with a gear 16 axially mounted on a screw shaft 15 axially provided on the flange 7 to form a reduction mechanism. The two screw shafts 15, 15 are provided with male screws of the same pitch, and the arms 1 projecting on both sides of the reflector cell 9 are provided.
The reflector displacement driving device 18 is configured by screwing female screws threaded on 7, 17 respectively.

In the projector lamp having the above structure, the reflector 3 supported by the vertical displacement support mechanism is displaced in parallel in the vertical direction (arrow A) by controlling the forward or reverse rotation and the rotation angle of the control motor 13 by an external control device. Then, the relative position of the optical axis L2 with respect to the optical axis L1 of the collimator lens 1 is changed to change the angle of the irradiation light beam.

That is, when the rotation angles of both control motors 13 and 13 are controlled to be the same, the screw shaft 15 is rotated via the gears 14 and 16, respectively. And the screw shaft 15
Is a reflector cell 9 fixed to the rear end of the reflector 3.
Since it is screwed in the vertical direction with the arm 17, the reflector cell 9 is displaced upward or downward along the screw shaft 15 by the screwing action of the both, and the reflector 3 integrated with the reflector cell 9 is formed. Displace.

FIGS. 7 to 10 show a second embodiment in which the vertical displacement support mechanism 4 and the reflector displacement driving device 18 are different, and the structure of the part different from the first embodiment will be described. . That is, the present embodiment is configured such that the reflector 3 is displaced and driven by one control motor 13, and the vertical displacement support mechanism 4 has a structure in addition to the structure of the upper sliding groove 8 and the sliding rod 10. In this structure, the anti-sway rods 20 and 20 extending from the reflector cell 9 to both sides are vertically slidably engaged with the long grooves 19 and 19 formed on both sides of the rear surface of the flange 7. The reflector displacement driving device 18 is configured by changing the structure of the lower sliding groove 8 and the sliding rod 10. The screw shaft 15 rotatably mounted on the flange 7 has a reflector cell 9 Gear shaft 22 in which a worm wheel 21 axially mounted on the screw shaft 15 is screwed into a female screw screwed on the lower side of the gear shaft 22.
The gear 24 is meshed with the worm 23, and the gear 24 is axially attached to the gear shaft 22 and the gear 14 is axially attached to the drive shaft of the control motor 13 fixed to the flange 7.

In the first embodiment, the reflector displacement driving device 18 having the pair of control motors 13 and 13 at symmetrical positions with respect to the central axis is shown, but the structure is only one of them. Can perform the same operation,
It goes without saying that various vertical displacement support mechanisms 4 and reflector displacement drive devices 18 can be constructed in addition to the disclosed embodiments.

[0015]

As described above, the movable reflector type projector lamp according to the present invention does not change the optical relative position of the collimator lens and the shade when the reflector is displaced to the left or right or up and down with respect to the optical axis. Since the reflector displacement driving structure is configured and the shade is configured to have a shape along the focal plane of the second focal position of the reflector, the shade and the reflector hold the initial optical relative position, and thus the irradiation light flux pattern Keeps the initial illuminance, the cutoff line becomes clear, and the position of the cutoff line formed by the shade maintains the initial position even if the irradiation light beam is inclined from the optical axis. In addition, the screw shaft and the displacement side member are screwed together to drive the displacement by the screw action, and a simple structure including a vertical displacement support structure in which the sliding groove and the displacement side member are slidably fitted is provided. Therefore, there is no rattling of the movable part, it is less likely to be affected by external stress, and it is possible to obtain a mechanism with high rigidity.
It is useful when constructing a control type headlight for various automobiles such as a weather sensitive headlight or a traveling environment sensitive headlight.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a movable projector lamp of a reflector according to the present invention.

FIG. 2 is an exploded perspective view of a part of the movable projector lamp of the reflector as seen from the rear side.

FIG. 3 is a partially cutaway front view of the same.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a right side view of FIG.

FIG. 7 is a front view showing a second embodiment of the movable reflector projector lamp according to the present invention.

8 is a sectional view taken along line VIII-VIII in FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a right side view of the state in which the cover in FIG. 7 is removed.

[Explanation of symbols]

 1 Collimator Lens 2 Lamp Body 3 Reflector 4 Vertical Displacement Support Mechanism 5 Valve 6 Shade 13 Control Motor 18 Reflector Displacement Driving Device L1, L2 Optical Axis

Claims (2)

[Claims] 1. A front lens such as a collimator lens is arranged on the front optical axis of the reflector, and a bulb is fixed at a substantially first focal point of the reflector so that a part of a light beam is provided between the bulb and the front lens. In a projector lamp having a shade for shutting off, a shade is fixedly provided on the collimator lens side, and the reflector integrated with a bulb is pivotally provided so as to be freely displaceable to the left or right or up and down with respect to an optical axis. In addition, the reflector movable projector lamp is characterized in that the reflector is configured to be displaced laterally or vertically by a reflector displacement driving device that is configured in a lamp body. 2. A displacement supporting means for slidably supporting a sliding groove or a sliding rail extending vertically or laterally, which is formed in a lamp body in which the reflector is fixedly provided with a collimator lens, in a slidable manner in the groove or the rail direction. A reflector displacement driving device in which a screw shaft that is pivotally mounted on the lamp body side and is rotationally driven by a control motor is screwed with a member on the reflector side, and the screwing action causes vertical or horizontal movement. 2. The reflector movable projector lamp according to claim 1, wherein the projector lamp is movable in parallel with the reflector.