JP2604689Y2 - Shade drive mechanism of 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 shade drive of a variable light distribution type headlight which changes a light distribution required for a vehicle to travel by sliding a shade up and down. It concerns the mechanism.

[0002]

2. Description of the Related Art Conventionally, there has been an automotive lamp in which the light distribution of an irradiation light beam is changed in accordance with the rotation angle of a steering wheel. As this type of lamp, a headlight configured to shift a shade of a light distribution pattern up and down by displacing a shade includes a collimator lens 51 on a front surface of a reflector 50 as shown in FIGS. And a bulb 52 serving as a light source and the collimator lens 51.
The rotating shaft is decentered, and a cylindrical shade 53 having a stepped portion is laterally pivoted, and the shade 53 is rotated by a driving mechanism 54 such as a motor in a direction orthogonal to the optical axis L. In other words, there is a structure in which the irradiation direction of the light distribution pattern is changed by rotating and displacing the shade 53 vertically (in the direction of the arrow X).

[0003] As shown in FIGS. 7 and 8, a shade 55 having an arc-shaped planar shape disposed at the focal plane of a collimator lens 51 is provided below a rack 56 provided vertically. And the shade 55 is moved up and down (in the direction of arrow Y) by a drive mechanism 54 such as a motor to displace the light beam in a direction perpendicular to the optical axis L, thereby changing the light distribution pattern of the irradiation light beam in the up and down direction. Some are displaced structures.

[0004]

Therefore, in this type of variable light distribution type headlamp, as shown in FIG.
Depending on the position 55, the light distribution pattern a of the luminous flux moves vertically (see broken line b) or horizontally (see dashed double-dotted line c) so that a pattern necessary for running of the vehicle can be obtained. However, the conventional cylindrical shade 5 as described above.
According to the configuration using No. 3, since the shade 53 is linear, both side portions thereof are located at positions away from the focal plane of the collimator lens 51, so that the cutoff line of the light distribution pattern of the irradiation light beam is used. Had the problem of blurring on both sides.

In order to prevent the occurrence of blurring on both sides of the cutoff line, a shade 55 as shown in FIG. 7 is attached to the focal plane of the collimator lens 51 so that the planar shape becomes an arc. The formed variable light distribution type headlamp has the disadvantage that the meshing state between the rack 56 and the pinion 57 becomes poor due to the vibration during running of the vehicle, and that the shade 55 cannot move up and down smoothly. Had.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and has a simple structure in which a light distribution of an irradiation light beam is changed by a vertical displacement of a shade provided in the lamp. A more preferable light distribution can be obtained by changing the shape of the pattern itself, and the light distribution variable type headlight can obtain a clear light distribution pattern of a cutoff line by smoothly pushing up or down the shade in the vertical direction. It is an object of the present invention to provide a shade driving mechanism.

[0007]

To achieve SUMMARY OF to the above objects, a light distribution variable headlamp shade drive mechanism according to the present invention, the co on the front optical axis of the reflector having an elliptical reflection mirror
In addition to disposing a remeter lens , a valve is fixed on the optical axis in front of the reflector, and the valve and the collimator lens are fixed.
Comprising a shade that blocks a portion of the light beam between the lens, as well as biased to pull down the shell <br/> over de to constantly downward by the elastic member, the shade, the second focal of the reflector
An eccentric cam structure provided near a point and disposed inside a cylindrical support having a cross-sectionally inverted U-shape is configured to push up to a predetermined height to obtain a light distribution necessary for traveling of the vehicle. The gist is that.

[0008]

According to the above construction, the shape of the light distribution pattern itself can be formed by a shade capable of changing and adjusting a part of the light beam reflected from the reflector to a desired height position, and the driving of the automobile can be performed. By freely switching and adjusting the range and height of the light distribution pattern of the irradiation light flux according to the situation, that is, the rotation angle of the steering, etc., a preferable light distribution necessary for driving the vehicle can be obtained. Further, the shade is urged by an elastic member so as to be constantly pulled down, and a push-up member such as an eccentric cam or a connecting rod formed inside a support base provided near a second focal point of the reflector. As a result, the shade can be appropriately raised from below to above, and the shade can be smoothly raised or lowered. In particular, a displacement occurred while the vehicle was running.
And does not break down.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shade driving mechanism for a variable light distribution headlamp according to the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In the drawings, reference numeral 1 denotes a reflector having an elliptical reflecting mirror surface 2 having a first focal point F1 and a second focal point F2 on an optical axis L. It is. A bulb 3 serving as a light source is disposed at a position of a first focal point F1 of the reflector 1, and a collimator lens 4 having a focal point shared with a second focal point F2 of the reflector 1 is provided on a front optical axis L of the reflector 1. It is.

Reference numeral 5 denotes a shade which is on the optical axis L and has a plane shape curved in an arc along the focal plane of the collimator lens 4. The shade 5 is fixed to a shade drive mechanism 7 mounted on a base 6 integrated with a lamp body (not shown) on the collimator lens 4 side so that the horizontal line and the vertical line coincide with the optical axis L of the lamp. It is.

That is, the shade 5 is provided upright on the upper surface of a cylindrical support base 8 having a vertical cross-section having an inverted U-shape with a lower end opened. The support 8 is fixed on a lamp body (not shown), and is supported between support frames 9 that guide at least the front and rear surfaces of the support 8 and guide sliding in the vertical direction. . The support 8 has a lower end 8
An elastic member 10 such as a coil spring or rubber for urging the support table 8 to be constantly pulled down is interposed between the base member 6 and the base 6 and is rotatably supported by a rotation shaft 11 inside thereof. The eccentric cam 12 is pivotally mounted horizontally, and the eccentric cam 1
The outer peripheral cam surface 2 is always in contact with the lower surface of the support base 8. A drive mechanism 14 such as a motor is connected to the rotation shaft 11 via an intermediate gear 13. The eccentric cam 12 is rotated or rotated (in the direction of arrow X) by controlling and driving the drive mechanism 14. The support base 8 is smoothly pushed upward against the urging force of the elastic member 10, and the support base 8 is operated to be pulled down by the urging force of the elastic member 10 (in the direction of the arrow Y). The shade 5 has a support 8
Of the optical axis L within a predetermined vertical stroke range
Is displaced with respect to. Reference numeral 15 denotes a potentiometer for detecting the vertical displacement position of the shade 5, and the eccentric cam 12
By setting the relationship between the steering mechanism and the steering mechanism of the vehicle such as steering in advance, the drive mechanism 14 can be controlled and driven by a central control circuit (not shown) by the detection signal from the potentiometer 15. In addition, the shade driving mechanism 7 according to the present invention is configured such that a switch (not shown) provided near the driver's seat of the vehicle is turned “ON” and “O”.
It is also possible to configure so that the drive can be manually controlled by the "FF" operation.

The shade driving mechanism 7 of the variable light distribution type headlamp constructed as described above irradiates a light distribution pattern by moving the shade 5 up and down in accordance with the rotation angle of the steering or by manual operation as required. The direction is vertically displaced in a direction perpendicular to the optical axis L, and effects such as preventing dazzling for a driver of an oncoming vehicle and improving road surface visibility in a turning direction of the vehicle are obtained.

FIG. 4 shows a second embodiment of the shade driving mechanism according to the present invention. In this embodiment, instead of the eccentric cam 12, one end 16 a of the connecting rod 16 is swingably connected to the lower surface of the support base 8, and the other end 16 b of the connecting rod 16 is located below the support base 8. And is rotatably connected to the end face of the rotating plate 17 eccentrically from the position of the rotating shaft 18, and the rotating plate 17 is rotated or rotated by a driving mechanism such as a motor (in the direction of the arrow X). ), Connecting rod 1
6, the support base 8 can be smoothly moved up and down (in the direction of arrow Y) together with the shade 5 in the same manner as in the first embodiment. . It should be noted that a driving mechanism such as a solenoid can be used instead of the elevating mechanism using the connecting rod 16.

[0014]

Effect of the Invention The shade driving mechanism of the variable light distribution headlamp according to the present invention is configured as described above, so that a part of the light beam is cut by the vertical movement of the shade and is suitable for the traveling conditions of the vehicle. While forming a preferable light distribution pattern, the shade can be moved up and down with respect to the optical axis as needed to switch the irradiation direction of the light distribution pattern up and down.

In addition, since the shade is constantly urged downward by the elastic member together with the support base, and the direction of the urging force of the elastic member is changed up and down by a rotating member such as an eccentric cam, the structure is supported. Provided is a highly reliable shade drive mechanism that can smoothly slide a support base up and down with respect to a frame, does not easily cause a displacement or a failure during vehicle running, and has excellent reliability. Therefore, the effect obtained by implementing the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a main part of a first embodiment of a variable light distribution type headlamp constituting a shade driving mechanism according to the present invention.

FIG. 2 is a sectional side view of a main part in the same manner.

FIG. 3 is an enlarged vertical sectional view showing the shade drive mechanism.

FIG. 4 is a sectional view of a main part showing a second embodiment of the shade driving mechanism.

FIG. 5 is a plan view of a variable light distribution type headlamp constituting a conventional cylindrical shade drive mechanism.

FIG. 6 is a side view of the same.

FIG. 7 is a perspective view of a main part of a variable light distribution type headlamp constituting a conventional shade having an arc-shaped planar shape.

FIG. 8 is a sectional side view of a main part in the same manner.

9A and 9B show a change in the irradiation direction of the light distribution pattern, wherein FIG. 9A shows a downward light distribution pattern position when traveling straight, FIG. 9B shows an upward light distribution pattern position, and FIG.
FIG. 4 is an explanatory diagram showing a light distribution pattern position in a state where the irradiation direction is displaced in response to a right turn of the vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reflector 2 Elliptical reflection mirror surface 3 Valve 4 Collimator lens 5 Shade 7 Shade drive mechanism 8 Support base 9 Support frame 10 Elastic member 11 Rotation axis 12 Eccentric cam 14 Drive mechanism (motor)

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F21S 8/10-8/12 F21V 11/00 F21V 13/00 F21V 14/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A with placing the collimator lens on the optical axis in front of the reflector having an elliptical reflecting mirror, fixedly mounted to the valve on the optical axis in front of said reflector, said the said valve co
Comprising a shade that blocks a portion of the light beam between Li meter lenses, urges to pull down the shade to constantly downward by the elastic member, the shade of the reflector
An eccentric cam structure disposed near a second focal point and disposed inside a cylindrical support having an inverted U-shape in cross section pushes it up to a predetermined height to dispose the arrangement necessary for traveling of the vehicle. A shade driving mechanism for a variable light distribution type headlamp, which is configured to obtain light.